<?xml version="1.0" encoding="utf-8"?>
<export-example>
  <doc>
    <id>24823</id>
    <completedYear/>
    <publishedYear>2019</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>4993</pageFirst>
    <pageLast>5001</pageLast>
    <pageNumber/>
    <edition/>
    <issue>6</issue>
    <volume>34</volume>
    <type>articler</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2019-12-04</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Online Estimation of Power System Inertia Using Dynamic Regressor Extension and Mixing</title>
    <abstract language="eng">The increasing penetration of power-electronic-interfaced devices is expected to have a significant effect on the overall system inertia and a crucial impact on the system dynamics. In future, the reduction of inertia will have drastic consequences on protection and real-time control and will play a crucial role in the system operation. Therefore, in a highly deregulated and uncertain environment, it is necessary for transmission system operators to be able to monitor the system inertia in real time. We address this problem by developing and validating an online inertia estimation algorithm. The estimator is derived using the recently proposed dynamic regressor and mixing procedure. The performance of the estimator is demonstrated via several test cases using the 1013-machine ENTSO-E dynamic model.</abstract>
    <parentTitle language="eng">IEEE Transactions on Power Systems</parentTitle>
    <identifier type="doi">10.1109/TPWRS.2019.2915249</identifier>
    <identifier type="issn">1558-0679</identifier>
    <identifier type="issn">0885-8950</identifier>
    <enrichment key="BTU">an der BTU erstellt / created at BTU</enrichment>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
    <enrichment key="opus.urn.autoCreate">false</enrichment>
    <author>
      <firstName>Johannes</firstName>
      <lastName>Schiffer</lastName>
    </author>
    <submitter>
      <firstName>Tino</firstName>
      <lastName>Fischer</lastName>
    </submitter>
    <author>
      <firstName>Petros</firstName>
      <lastName>Aristidou</lastName>
    </author>
    <author>
      <firstName>Romeo</firstName>
      <lastName>Ortega</lastName>
    </author>
    <collection role="institutes" number="3206">FG Regelungssysteme und Netzleittechnik</collection>
  </doc>
  <doc>
    <id>25906</id>
    <completedYear/>
    <publishedYear>2020</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber>9</pageNumber>
    <edition/>
    <issue/>
    <volume>189</volume>
    <type>articler</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2020-08-13</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Wide-area oscillation damping in low-inertia grids under time-varying communication delays</title>
    <abstract language="eng">Wide-Area Control (WAC) can be efficiently used for oscillation damping in power systems. However, to implement a WAC, a communication network is required to transmit signals between the generation units and the control center. In turn, this makes WAC vulnerable to time-varying communication delays that, if not appropriately considered in the control design, can destabilize the system. Moreover, with the increasing integration of renewable energy resources into the grid, usually interfaced via power electronics, power system dynamics are becoming drastically faster and making WAC more vulnerable to communication delays. In this paper, we propose a design procedure for a delay-robust wide-area oscillation damping controller for low-inertia systems. Its performance is illustrated on the well-known Kundur two-area system. The results indicate that the obtained WAC successfully improves the oscillation damping while ensuring robustness against time-varying communication delays.</abstract>
    <parentTitle language="eng">ScienceDirect</parentTitle>
    <identifier type="doi">10.1016/j.epsr.2020.106629</identifier>
    <identifier type="issn">0378-7796</identifier>
    <enrichment key="BTU">an der BTU erstellt / created at BTU</enrichment>
    <enrichment key="Artikelnummer">106629</enrichment>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
    <enrichment key="opus.urn.autoCreate">false</enrichment>
    <enrichment key="Fprofil">1 Energiewende und Dekarbonisierung / Energy Transition and Decarbonisation</enrichment>
    <author>
      <firstName>Sultan</firstName>
      <lastName>Alghamdi</lastName>
    </author>
    <submitter>
      <firstName>Hans-Jürgen</firstName>
      <lastName>Schönrath</lastName>
    </submitter>
    <author>
      <firstName>Uros</firstName>
      <lastName>Markovic</lastName>
    </author>
    <author>
      <firstName>Ognjen</firstName>
      <lastName>Stanojev</lastName>
    </author>
    <author>
      <firstName>Johannes</firstName>
      <lastName>Schiffer</lastName>
    </author>
    <author>
      <firstName>Gabriela</firstName>
      <lastName>Hug</lastName>
    </author>
    <author>
      <firstName>Petros</firstName>
      <lastName>Aristidou</lastName>
    </author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Low-inertia systems</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Oscillation damping</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Time-varying communication delay</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Wide-area control</value>
    </subject>
    <collection role="institutes" number="3206">FG Regelungssysteme und Netzleittechnik</collection>
  </doc>
  <doc>
    <id>26784</id>
    <completedYear/>
    <publishedYear>2020</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>4726</pageFirst>
    <pageLast>4740</pageLast>
    <pageNumber/>
    <edition/>
    <issue>11</issue>
    <volume>65</volume>
    <type>articler</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2021-01-20</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">A Tool for Analysis of Existence of Equilibria and Voltage Stability in Power Systems with Constant Power Loads</title>
    <abstract language="eng">It is well known that constant power loads in power systems have a destabilizing effect. Their growing presence in modern installations significantly aggravates this issue, hence, motivating the development of new methods to analyze their effect in ac and dc power systems. Formally, this problem can be cast as the analysis of solutions of a set of nonlinear algebraic equations of the form f(x) = 0, where f : R n → R n , to which we associate the differential equation x = f(x). By invoking advanced concepts of dynamical systems theory and effectively exploiting its monotonicity, the following properties are established: First, prove that, if there are equilibria, there is a distinguished one that is stable and attractive, and give conditions such that it is unique. Second, give a simple online procedure to decide whether equilibria exist or not and to compute the distinguished one. Third, prove that the method is also applicable for the case when the parameters of the system are not exactly known. It is shown how the proposed tool can be applied to the analysis of long-term voltage stability in ac power systems, and to the study of existence of equilibria of multiterminal high-voltage dc systems and dc microgrids.</abstract>
    <parentTitle language="eng">IEEE Transactions on Automatic Control</parentTitle>
    <identifier type="doi">10.1109/TAC.2020.2965028</identifier>
    <identifier type="issn">0018-9286</identifier>
    <identifier type="issn">1558-2523</identifier>
    <enrichment key="BTU">an der BTU erstellt / created at BTU</enrichment>
    <enrichment key="opus.source">publish</enrichment>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
    <enrichment key="opus.urn.autoCreate">false</enrichment>
    <enrichment key="Fprofil">1 Energiewende und Dekarbonisierung / Energy Transition and Decarbonisation</enrichment>
    <author>
      <firstName>Alexey S.</firstName>
      <lastName>Matveev</lastName>
    </author>
    <submitter>
      <firstName>Tino</firstName>
      <lastName>Fischer</lastName>
    </submitter>
    <author>
      <firstName>Juan Eduardo</firstName>
      <lastName>Machado</lastName>
    </author>
    <author>
      <firstName>Romeo</firstName>
      <lastName>Ortega</lastName>
    </author>
    <author>
      <firstName>Johannes</firstName>
      <lastName>Schiffer</lastName>
    </author>
    <author>
      <firstName>Anton</firstName>
      <lastName>Pyrkin</lastName>
    </author>
    <collection role="institutes" number="3206">FG Regelungssysteme und Netzleittechnik</collection>
  </doc>
  <doc>
    <id>26785</id>
    <completedYear/>
    <publishedYear>2020</publishedYear>
    <thesisYearAccepted/>
    <language>deu</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber>8</pageNumber>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject_ref</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2021-01-20</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="deu">Wide-Area Oscillation Damping in Low-Inertia Grids under Time-Varying Communication Delays</title>
    <abstract language="eng">Wide-Area Control (WAC) can be efficiently used for oscillation damping in power systems. However, to implement a WAC, a communication network is required to transmit signals between the generation units and the control center. In turn, this makes WAC vulnerable to time-varying communication delays that, if not appropriately considered in the control design, can destabilize the system. Moreover, with the increasing integration of renewable energy resources into the grid, usually interfaced via power electronics, the power system dynamics becoming drastically faster and making WAC more vulnerable to communication delays. In this paper, we propose a design procedure for a delay-robust wide-area oscillation damping controller for low-inertia systems. Its performance is illustrated on the well-known Kundur two-area system. The results indicate that the obtained WAC successfully improves the oscillation damping while ensuring robustness against time-varying communication delays.</abstract>
    <parentTitle language="deu">21st Power Systems Computation Conference, Porto, Portugal — June 29 – July 3, 2020</parentTitle>
    <identifier type="url">https://www-docs.b-tu.de/fg-regelungssysteme/public/Publications/Widearea_oscillation.pdf</identifier>
    <enrichment key="BTU">an der BTU erstellt / created at BTU</enrichment>
    <enrichment key="opus.source">publish</enrichment>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
    <enrichment key="opus.urn.autoCreate">false</enrichment>
    <enrichment key="Fprofil">1 Energiewende und Dekarbonisierung / Energy Transition and Decarbonisation</enrichment>
    <author>
      <firstName>Sultan</firstName>
      <lastName>Alghamdi</lastName>
    </author>
    <submitter>
      <firstName>Tino</firstName>
      <lastName>Fischer</lastName>
    </submitter>
    <author>
      <firstName>Uros</firstName>
      <lastName>Markovic</lastName>
    </author>
    <author>
      <firstName>Ognjen</firstName>
      <lastName>Stanojev</lastName>
    </author>
    <author>
      <firstName>Johannes</firstName>
      <lastName>Schiffer</lastName>
    </author>
    <author>
      <firstName>Gabriela</firstName>
      <lastName>Hug</lastName>
    </author>
    <author>
      <firstName>Petros</firstName>
      <lastName>Aristidou</lastName>
    </author>
    <collection role="institutes" number="3206">FG Regelungssysteme und Netzleittechnik</collection>
  </doc>
  <doc>
    <id>26787</id>
    <completedYear/>
    <publishedYear>2020</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>691</pageFirst>
    <pageLast>703</pageLast>
    <pageNumber/>
    <edition/>
    <issue>2</issue>
    <volume>29</volume>
    <type>articler</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2021-01-20</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Synthesizing Sparse and Delay-Robust Distributed Secondary Frequency Controllers for Microgrids</title>
    <abstract language="eng">Consensus-based control schemes experience increasing popularity in the context of secondary frequency control in microgrids. Fundamental aspects in their practical implementation are the design of the communication topology as well as robustness with respect to both time-varying communication delays and exogenous disturbances. Motivated by this, we propose a design procedure for a consensus-based secondary frequency controller that ensures robustness with respect to heterogeneous fast-varying communication delays and simultaneously provides the option to trade off the L₂-gain performance against the number of required communication links. Our design criterion is equilibrium-independent and based on the Lyapunov-Krasovskii method for interval time-varying delays together with the descriptor method. The efficacy of the proposed approach is demonstrated by using numerical experiments on the CIGRE benchmark medium-voltage distribution network.</abstract>
    <parentTitle language="eng">IEEE Transactions on Control Systems Technology</parentTitle>
    <identifier type="doi">10.1109/TCST.2020.2977300</identifier>
    <identifier type="issn">1558-0865</identifier>
    <identifier type="issn">1063-6536</identifier>
    <enrichment key="BTU">an der BTU erstellt / created at BTU</enrichment>
    <enrichment key="opus.source">publish</enrichment>
    <enrichment key="Fprofil">1 Energiewende und Dekarbonisierung / Energy Transition and Decarbonisation</enrichment>
    <author>
      <firstName>Sultan</firstName>
      <lastName>Alghamdi</lastName>
    </author>
    <submitter>
      <firstName>Tino</firstName>
      <lastName>Fischer</lastName>
    </submitter>
    <author>
      <firstName>Johannes</firstName>
      <lastName>Schiffer</lastName>
    </author>
    <author>
      <firstName>Emilia</firstName>
      <lastName>Fridman</lastName>
    </author>
    <collection role="institutes" number="3206">FG Regelungssysteme und Netzleittechnik</collection>
  </doc>
  <doc>
    <id>26788</id>
    <completedYear/>
    <publishedYear>2020</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber>6</pageNumber>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject_ref</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2021-01-20</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">A Globally Convergent State Observer for Multimachine Power Systems with Lossy Lines</title>
    <abstract language="eng">We present the first solution to the problem of estimation of the state of multimachinepower systems with lossy transmission lines. We consider the classical three-dimensional “flux-decay” model of the power system and assume that the active and reactive power as wellas the rotor angle and excitation voltage at each generator is available for measurement—ascenario that is feasible with current technology. The design of the observer relies on two recentdevelopments proposed by the authors: a parameter estimation based approach to the problemof state estimation and the use of the dynamic regressor extension and mixing technique toestimate these parameters. Thanks to the combination of these techniques it is possible toovercome the problem of lack of persistent excitation that stymies the application of standardobserver designs. Simulation results illustrate the performance of the proposed observer.</abstract>
    <parentTitle language="eng">21st IFAC World Congress, Berlin, Germany, Jul. 11-17, 2020</parentTitle>
    <identifier type="url">https://www-docs.b-tu.de/fg-regelungssysteme/public/Publications/Globally_convergent.pdf</identifier>
    <identifier type="url">https://arxiv.org/abs/2005.01482</identifier>
    <enrichment key="BTU">an der BTU erstellt / created at BTU</enrichment>
    <enrichment key="opus.source">publish</enrichment>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
    <enrichment key="opus.urn.autoCreate">false</enrichment>
    <enrichment key="Fprofil">1 Energiewende und Dekarbonisierung / Energy Transition and Decarbonisation</enrichment>
    <author>
      <firstName>Alexey</firstName>
      <lastName>Bobtsov</lastName>
    </author>
    <submitter>
      <firstName>Tino</firstName>
      <lastName>Fischer</lastName>
    </submitter>
    <author>
      <firstName>Romeo</firstName>
      <lastName>Ortega</lastName>
    </author>
    <author>
      <firstName>Nikolay</firstName>
      <lastName>Nikolaev</lastName>
    </author>
    <author>
      <firstName>Johannes</firstName>
      <lastName>Schiffer</lastName>
    </author>
    <collection role="institutes" number="3206">FG Regelungssysteme und Netzleittechnik</collection>
  </doc>
  <doc>
    <id>26790</id>
    <completedYear/>
    <publishedYear>2020</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber>7</pageNumber>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject_ref</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2021-01-20</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">A Performance Comparison of PLL Algorithms in Low-Inertia Power Systems Using an Observer-Based Framework</title>
    <abstract language="eng">Phase-locked loop (PLL) implementations are critical components for the control and operation of grid-connected converters. Hence, they have to exhibit a highly reliable behavior under a wide range of operating conditions. Available implementations and performance analyses mainly focus on the impact of unbalances and harmonics. However, in converter-dominated low-inertia power systems an additional important type of perturbation will arise from fast variations in the grid frequency. Motivated by this, we show that the structure of several popular PLL implementations is closely related to that of high-gain observers and, by using this framework, provide a tuning criterion for the PLL gains that mitigates the impact of the rate of change of the frequency (RoCoF) on the estimation performance. This criterion is then used to conduct a numerical comparison of four popular PLL implementations under three distorted conditions: unbalances, harmonics and frequency variations.</abstract>
    <parentTitle language="eng">21st IFAC World Congress, Berlin, Germany, Jul. 11-17, 2020</parentTitle>
    <identifier type="url">https://www.google.com/url?sa=t&amp;rct=j&amp;q=&amp;esrc=s&amp;source=web&amp;cd=&amp;cad=rja&amp;uact=8&amp;ved=2ahUKEwj-3Nvqy6zuAhVCi1wKHSFhAWcQFjAAegQIBhAC&amp;url=https%3A%2F%2Fwww-docs.b-tu.de%2Ffg-regelungssysteme%2Fpublic%2FPublications%2FA%2520performance%2520comparison%2520of%2520PLL%2520implementations%2520in%2520low%2520lnertia%2520power%2520systems%2520using%2520an%2520observer-based%2520framework.pdf&amp;usg=AOvVaw0N4TiSh9cu9DeyVoOhNZpf</identifier>
    <enrichment key="BTU">an der BTU erstellt / created at BTU</enrichment>
    <enrichment key="opus.source">publish</enrichment>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
    <enrichment key="opus.urn.autoCreate">false</enrichment>
    <enrichment key="Fprofil">1 Energiewende und Dekarbonisierung / Energy Transition and Decarbonisation</enrichment>
    <author>
      <firstName>Juan G.</firstName>
      <lastName>Rueda-Escobedo</lastName>
    </author>
    <submitter>
      <firstName>Tino</firstName>
      <lastName>Fischer</lastName>
    </submitter>
    <author>
      <firstName>Shiqing</firstName>
      <lastName>Tang</lastName>
    </author>
    <author>
      <firstName>Johannes</firstName>
      <lastName>Schiffer</lastName>
    </author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Phase-locked loop implementations; Frequency estimation;High-gain observers; Electric power systems; Low-inertia systems; Inverter-based applications</value>
    </subject>
    <collection role="institutes" number="3206">FG Regelungssysteme und Netzleittechnik</collection>
  </doc>
  <doc>
    <id>26793</id>
    <completedYear/>
    <publishedYear>2020</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber>6</pageNumber>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject_ref</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2021-01-20</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">A Passivity-Inspired Design of Power-Voltage Droop for DC Microgrids with Electrical Network Dynamics</title>
    <abstract language="eng">We propose a design procedure for a power-voltage droop controller in structure-preserving DC microgrids under explicit consideration of the electrical network dynamics. Differently from most related literature, the system’s controlled output is taken as the power—not the current—injection at each generation unit, yielding a nonlinear closed-loop system. This makes the output regulation problem non-trivial, yet far more appealing in a practical setting than the usual linear current-voltage droop control. Our approach is inspired by passivity-based control design in the sense that we exploit the natural port-Hamiltonian representation of the system dynamics and its associated shifted Hamiltonian to derive a control law together with sufficient conditions on the tuning gains that guarantee global asymptotic stability. The analysis is illustrated via detailed simulations, where accurate power sharing is manifested among the distributed generation units in the presence of load variations.</abstract>
    <parentTitle language="eng">59th IEEE Conference on Decision and Control (CDC), Jeju Island, Republic of Korea, Dec. 14-18, 2020</parentTitle>
    <identifier type="url">https://www-docs.b-tu.de/fg-regelungssysteme/public/Publications/2020%20A%20Passivity-Inspired%20Design%20of%20Power-Voltage%20Droop%20for%20DC%20Microgrids%20with%20Electrical%20Network%20Dynamics.pdf</identifier>
    <enrichment key="BTU">an der BTU erstellt / created at BTU</enrichment>
    <enrichment key="opus.source">publish</enrichment>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
    <enrichment key="opus.urn.autoCreate">false</enrichment>
    <enrichment key="Fprofil">1 Energiewende und Dekarbonisierung / Energy Transition and Decarbonisation</enrichment>
    <author>
      <firstName>Juan Eduardo</firstName>
      <lastName>Machado</lastName>
    </author>
    <submitter>
      <firstName>Tino</firstName>
      <lastName>Fischer</lastName>
    </submitter>
    <author>
      <firstName>Johannes</firstName>
      <lastName>Schiffer</lastName>
    </author>
    <collection role="institutes" number="3206">FG Regelungssysteme und Netzleittechnik</collection>
  </doc>
  <doc>
    <id>26794</id>
    <completedYear/>
    <publishedYear>2020</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber>8</pageNumber>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject_ref</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2021-01-20</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Data-Driven Internal Model Control of Second-Order Discrete Volterra Systems</title>
    <abstract language="eng">The increase in system complexity paired with a growing availability of operational data has motivated a change in the traditional control design paradigm. Instead of modeling the system by first principles and then proceeding with a (model-based) control design, the data-driven control paradigm proposes to directly characterize the controller from data. By exploiting a fundamental result of Willems and collaborators, this approach has been successfully applied to linear systems, yielding data-based formulas for many classical linear controllers. In the present paper, the data-driven approach is extended to a class of nonlinear systems, namely second-order discrete Volterra systems. Two main contributions are made for this class of systems. At first, we show that - under a necessary and sufficient condition on the input data excitation - a data-based system representation can be derived from input-output data and used to replace an explicit system model. That is, the fundamental result of Willems et al.is extended to this class of systems. Subsequently a data-driven internal model control formula for output-tracking is derived. The approach is illustrated via two simulation examples</abstract>
    <parentTitle language="eng">59th IEEE Conference on Decision and Control (CDC), Jeju Island, Republic of Korea, Dec. 14-18, 2020</parentTitle>
    <identifier type="url">https://www-docs.b-tu.de/fg-regelungssysteme/public/Publications/2020%20RuedaSchiffer%20Data-Driven%20Internal%20Model%20Control%20of%20Second-Order%20Discrete%20Volterra%20Systems.pdf</identifier>
    <enrichment key="BTU">an der BTU erstellt / created at BTU</enrichment>
    <enrichment key="opus.source">publish</enrichment>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
    <enrichment key="opus.urn.autoCreate">false</enrichment>
    <enrichment key="Fprofil">1 Energiewende und Dekarbonisierung / Energy Transition and Decarbonisation</enrichment>
    <author>
      <firstName>Juan G.</firstName>
      <lastName>Rueda-Escobedo</lastName>
    </author>
    <submitter>
      <firstName>Tino</firstName>
      <lastName>Fischer</lastName>
    </submitter>
    <author>
      <firstName>Johannes</firstName>
      <lastName>Schiffer</lastName>
    </author>
    <collection role="institutes" number="3206">FG Regelungssysteme und Netzleittechnik</collection>
  </doc>
  <doc>
    <id>26795</id>
    <completedYear/>
    <publishedYear>2020</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber>6</pageNumber>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject_ref</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2021-01-20</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Observer-Based Excitation Control for Transient Stabilization of the Single Machine Infinite Bus System</title>
    <abstract language="eng">The availability of excitation controllers to enhance transient stability has regained significant relevance in recent years, due to the unprecedented ongoing changes in power systems. Yet, the practical deployment of many reported control schemes is hampered by the fact that their implementation requires the measurement of the full state vector. Our main contribution is to address this fundamental obstacle by proposing an observer-based excitation controller using modern phasor measurement technology. For this purpose, a linear time-varying observer scheme for the generator frequency and the internal voltage is derived. This observer is then combined with a classical passivity-based excitation controller. Stability of the resulting nonlinear observer-based closed-loop system is shown by deriving an ISS-based separation principle. The performance of the proposed approach is demonstrated via simulation example.</abstract>
    <parentTitle language="eng">59th IEEE Conference on Decision and Control (CDC), Jeju Island, Republic of Korea, Dec. 14-18, 2020</parentTitle>
    <identifier type="url">https://www-docs.b-tu.de/fg-regelungssysteme/public/Publications/2020%20RojasRuedaEspinosaSchiffer%20Observer-Based%20Excitation%20Control%20for%20Transient%20Stabilization%20of%20the%20Single%20Machine%20Infinite%20Bus%20System.pdf</identifier>
    <enrichment key="BTU">an der BTU erstellt / created at BTU</enrichment>
    <enrichment key="opus.source">publish</enrichment>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
    <enrichment key="opus.urn.autoCreate">false</enrichment>
    <enrichment key="Fprofil">1 Energiewende und Dekarbonisierung / Energy Transition and Decarbonisation</enrichment>
    <author>
      <firstName>Michael</firstName>
      <lastName>Rojas</lastName>
    </author>
    <submitter>
      <firstName>Tino</firstName>
      <lastName>Fischer</lastName>
    </submitter>
    <author>
      <firstName>Juan G.</firstName>
      <lastName>Rueda-Escobedo</lastName>
    </author>
    <author>
      <firstName>Gerardo</firstName>
      <lastName>Espinosa-Pérez</lastName>
    </author>
    <author>
      <firstName>Johannes</firstName>
      <lastName>Schiffer</lastName>
    </author>
    <collection role="institutes" number="3206">FG Regelungssysteme und Netzleittechnik</collection>
  </doc>
  <doc>
    <id>26815</id>
    <completedYear/>
    <publishedYear>2020</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>6267</pageFirst>
    <pageLast>6275</pageLast>
    <pageNumber/>
    <edition/>
    <issue>25</issue>
    <volume>14</volume>
    <type>articler</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2021-01-22</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">PMU-Based Decentralized Mixed Algebraic and Dynamic State Observation in Multi-Machine Power Systems</title>
    <abstract language="eng">We propose a novel decentralized mixed algebraic and dynamic state observation method for multi-machine power systems with unknown inputs and equipped with Phasor Measurement Units (PMUs). More specifically, we prove that for the third-order flux-decay model of a synchronous generator, the local PMU measurements give enough information to reconstruct algebraically the load angle and the quadrature-axis internal voltage. Due to the algebraic structure a high numerical efficiency is achieved, which makes the method applicable to large scale power systems. Also, we prove that the relative shaft speed can be globally estimated combining a classical Immersion and Invariance (I&amp;I) observer with—the recently introduced—dynamic regressor and mixing (DREM) parameter estimator. This adaptive observer ensures global convergence under weak excitation assumptions that are verified in applications. The proposed method does not require the measurement of exogenous inputs signals such as the field voltage and the mechanical torque nor the knowledge of mechanical subsystem parameters.</abstract>
    <parentTitle language="eng">IET Generation, Transmission &amp; Distribution</parentTitle>
    <identifier type="url">https://ietresearch.onlinelibrary.wiley.com/doi/10.1049/iet-gtd.2020.1275</identifier>
    <identifier type="doi">10.1049/iet-gtd.2020.1275</identifier>
    <identifier type="issn">1751-8695</identifier>
    <identifier type="issn">1751-8687</identifier>
    <enrichment key="BTU">an der BTU erstellt / created at BTU</enrichment>
    <enrichment key="opus.source">publish</enrichment>
    <enrichment key="Fprofil">1 Energiewende und Dekarbonisierung / Energy Transition and Decarbonisation</enrichment>
    <author>
      <firstName>Nicolai</firstName>
      <lastName>Lorenz-Meyer</lastName>
    </author>
    <submitter>
      <firstName>Tino</firstName>
      <lastName>Fischer</lastName>
    </submitter>
    <author>
      <firstName>Alexey</firstName>
      <lastName>Bobtsov</lastName>
    </author>
    <author>
      <firstName>Romeo</firstName>
      <lastName>Ortega</lastName>
    </author>
    <author>
      <firstName>Nikolay</firstName>
      <lastName>Nikolaev</lastName>
    </author>
    <author>
      <firstName>Johannes</firstName>
      <lastName>Schiffer</lastName>
    </author>
    <collection role="institutes" number="3206">FG Regelungssysteme und Netzleittechnik</collection>
  </doc>
  <doc>
    <id>27656</id>
    <completedYear/>
    <publishedYear>2020</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>14185</pageFirst>
    <pageLast>14191</pageLast>
    <pageNumber/>
    <edition/>
    <issue>2</issue>
    <volume>53</volume>
    <type>articler</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2021-07-21</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">An Internal Model Approach to Robust Current Control of IPMSM Drives with Respect to Unknown and Varying Inductances</title>
    <title language="deu">Ein interner Modellansatz zur robusten Stromregelung von IPMSM-Antrieben unter Berücksichtigung von unbekannten und variierenden Induktivitäten</title>
    <abstract language="eng">Interior permanent magnet synchronous machines (IPMSMs) are well-suited for high-performance applications, such as traction drives in hybrid and electric vehicles. Yet a major challenge to fully exploit their potential is the fact that their self and cross-coupling inductances vary significantly across the operation range. In addition, this variation is difficult to characterize and complicates the design of provably stabilizing and robust controls. Motivated by this, by using an IPMSM model with current dependant inductances together with the internal model principle, a nonlinear current control scheme is derived that renders the equilibrium point of the closed-loop system exponentially stable. Both the control and the stability result only require the knowledge of an upper bound of the gradient of the inductances as well as lower and upper bounds on the inductance values themselves, while their actual evolution can be completely unknown. This is a major advantage compared to existing (PI-based) current control approaches, as it makes costly practices to determine the inductance variations unnecessary. The efficacy of the proposed control scheme is demonstrated in a simulation example.</abstract>
    <parentTitle language="eng">IFAC PapersOnLine</parentTitle>
    <identifier type="url">https://www.sciencedirect.com/science/article/pii/S2405896320314154</identifier>
    <identifier type="doi">10.1016/j.ifacol.2020.12.1046</identifier>
    <identifier type="issn">2405-8963</identifier>
    <enrichment key="BTU">an der BTU erstellt / created at BTU</enrichment>
    <enrichment key="opus.source">publish</enrichment>
    <enrichment key="Fprofil">1 Energiewende und Dekarbonisierung / Energy Transition and Decarbonisation</enrichment>
    <enrichment key="Fprofil">4 Künstliche Intelligenz und Sensorik / Artificial Intelligence and Sensor Technology</enrichment>
    <submitter>
      <firstName>Renè</firstName>
      <lastName>Metzkow</lastName>
    </submitter>
    <author>
      <firstName>Renè</firstName>
      <lastName>Metzkow</lastName>
    </author>
    <author>
      <firstName>Juan G.</firstName>
      <lastName>Rueda-Escobedo</lastName>
    </author>
    <author>
      <firstName>Daniela</firstName>
      <lastName>Döring</lastName>
    </author>
    <author>
      <firstName>Johannes</firstName>
      <lastName>Schiffer</lastName>
    </author>
    <collection role="institutes" number="3206">FG Regelungssysteme und Netzleittechnik</collection>
    <collection role="institutes" number="3105">FG Systemtechnik</collection>
  </doc>
  <doc>
    <id>28866</id>
    <completedYear/>
    <publishedYear>2022</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber>7</pageNumber>
    <edition/>
    <issue/>
    <volume>142</volume>
    <type>articler</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2022-05-13</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Voltage regulation and current sharing for multi-bus DC microgrids: A compromised design approach</title>
    <abstract language="eng">It is well known that accurate current sharing and voltage regulation are both important, yet conflicting control objectives in multi-bus DC microgrids. In this paper a distributed control scheme is proposed, which simultaneously considers these two control objectives via a trade-off factor. This factor permits to adjust the degree of compromise between accurate voltage regulation and current sharing. At the same time, the voltage of a critical node can be precisely regulated. A sufficient condition for closed-loop stability is given and it is shown that the control parameters can always be chosen, such that stability is guaranteed. In addition, the steady state voltage and current deviations relative to their rated values are quantified via suitable metrics. For a given topology and settings of a DC microgrid, a sufficient condition for the existence of the trade-off factor is provided. The results are illustrated by simulation examples.</abstract>
    <parentTitle language="eng">Automatica</parentTitle>
    <identifier type="url">https://www.sciencedirect.com/science/article/pii/S0005109822001893</identifier>
    <identifier type="doi">10.1016/j.automatica.2022.110340</identifier>
    <identifier type="issn">0005-1098</identifier>
    <enrichment key="BTU">an der BTU erstellt / created at BTU</enrichment>
    <enrichment key="Artikelnummer">110340</enrichment>
    <enrichment key="opus.source">publish</enrichment>
    <enrichment key="Fprofil">1 Energiewende und Dekarbonisierung / Energy Transition and Decarbonisation</enrichment>
    <author>
      <firstName>Handong</firstName>
      <lastName>Bai</lastName>
    </author>
    <submitter>
      <firstName>Magda-Emelie</firstName>
      <lastName>Wyslugocki</lastName>
    </submitter>
    <author>
      <firstName>Hongwai</firstName>
      <lastName>Zhang</lastName>
    </author>
    <author>
      <firstName>He</firstName>
      <lastName>Cai</lastName>
    </author>
    <author>
      <firstName>Johannes</firstName>
      <lastName>Schiffer</lastName>
    </author>
    <collection role="institutes" number="3206">FG Regelungssysteme und Netzleittechnik</collection>
  </doc>
  <doc>
    <id>28852</id>
    <completedYear/>
    <publishedYear>2022</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>2123</pageFirst>
    <pageLast>2130</pageLast>
    <pageNumber/>
    <edition/>
    <issue>4</issue>
    <volume>67</volume>
    <type>articler</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2022-05-12</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">State Observation of Power Systems Equipped with Phasor Measurement Units: The Case of Fourth Order Flux-Decay Model</title>
    <abstract language="eng">The problem of effective use of phasor measurement units (PMUs) to enhance power systems awareness and security is a topic of key interest. The central question to solve is how to use these new measurements to reconstruct the state of the system. In this article, we provide the first solution to the problem of (globally convergent) state estimation of multimachine power systems equipped with PMUs and described by the fourth-order flux-decay model. This article is a significant extension of our previous result, where this problem was solved for the simpler third-order model, for which it is possible to recover algebraically part of the unknown state. Unfortunately, this property is lost in the more accurate fourth-order model, and we are confronted with the problem of estimating the full state vector. The design of the observer relies on two recent developments proposed by the authors, a parameter estimation based approach to the problem of state estimation and the use of the dynamic regressor extension and mixing (DREM) technique to estimate these parameters. The use of DREM allows us to overcome the problem of lack of persistent excitation that stymies the application of standard parameter estimation designs. Simulation results illustrate the latter fact and show the improved performance of the proposed observer with respect to a locally stable gradient-descent-based observer.</abstract>
    <parentTitle language="eng">IEEE Transactions on Automatic Control</parentTitle>
    <identifier type="issn">0018-9286</identifier>
    <identifier type="issn">1558-2523</identifier>
    <identifier type="doi">10.1109/TAC.2021.3073887</identifier>
    <identifier type="url">https://doi.org/10.1109/TAC.2021.3073887</identifier>
    <enrichment key="BTU">an der BTU erstellt / created at BTU</enrichment>
    <enrichment key="opus.source">publish</enrichment>
    <enrichment key="Fprofil">1 Energiewende und Dekarbonisierung / Energy Transition and Decarbonisation</enrichment>
    <author>
      <firstName>Alexey</firstName>
      <lastName>Bobtsov</lastName>
    </author>
    <submitter>
      <firstName>Magda-Emelie</firstName>
      <lastName>Wyslugocki</lastName>
    </submitter>
    <author>
      <firstName>Romeo</firstName>
      <lastName>Ortega</lastName>
    </author>
    <author>
      <firstName>Nikolay</firstName>
      <lastName>Nikolaev</lastName>
    </author>
    <author>
      <firstName>Nicolai</firstName>
      <lastName>Lorenz-Meyer</lastName>
    </author>
    <author>
      <firstName>Johannes</firstName>
      <lastName>Schiffer</lastName>
    </author>
    <collection role="institutes" number="3206">FG Regelungssysteme und Netzleittechnik</collection>
  </doc>
  <doc>
    <id>29366</id>
    <completedYear/>
    <publishedYear>2021</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber/>
    <edition/>
    <issue>129</issue>
    <volume/>
    <type>articler</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2022-10-11</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Generalized parameter estimation-based observers: Application to power systems and chemical–biological reactors</title>
    <abstract language="eng">In this paper we propose a new state observer design technique for nonlinear systems. It consists of an extension of the recently introduced parameter estimation-based observer, which is applicable for systems verifying a particular algebraic constraint. In contrast to the previous observer, the new one avoids the need of implementing an open loop integration that may stymie its practical application. We give two versions of this observer, one that ensures asymptotic convergence and the second one that achieves convergence in finite time. In both cases, the required excitation conditions are strictly weaker than the classical persistent of excitation assumption. It is shown that the proposed technique is applicable to the practically important examples of multimachine power systems and chemical–biological reactors.</abstract>
    <parentTitle language="eng">Automatica</parentTitle>
    <identifier type="issn">0005-1098</identifier>
    <identifier type="url">https://www.sciencedirect.com/science/article/pii/S0005109821001552?via%3Dihub#!</identifier>
    <identifier type="doi">10.1016/j.automatica.2021.109635</identifier>
    <enrichment key="BTU">an der BTU erstellt / created at BTU</enrichment>
    <enrichment key="Artikelnummer">109635</enrichment>
    <enrichment key="opus.source">publish</enrichment>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
    <enrichment key="opus.urn.autoCreate">false</enrichment>
    <enrichment key="Fprofil">1 Energiewende und Dekarbonisierung / Energy Transition and Decarbonisation</enrichment>
    <author>
      <firstName>Romeo</firstName>
      <lastName>Ortega</lastName>
    </author>
    <submitter>
      <firstName>Magda-Emelie</firstName>
      <lastName>Wyslugocki</lastName>
    </submitter>
    <author>
      <firstName>Alexey</firstName>
      <lastName>Bobtsov</lastName>
    </author>
    <author>
      <firstName>Nikolay</firstName>
      <lastName>Nikolaev</lastName>
    </author>
    <author>
      <firstName>Johannes</firstName>
      <lastName>Schiffer</lastName>
    </author>
    <author>
      <firstName>Denis</firstName>
      <lastName>Dochain</lastName>
    </author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Estimation parameters</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Nonlinear systems</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Observers</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Time-invariant systems</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Power systems</value>
    </subject>
    <collection role="institutes" number="3206">FG Regelungssysteme und Netzleittechnik</collection>
  </doc>
  <doc>
    <id>29367</id>
    <completedYear/>
    <publishedYear>2022</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>3321</pageFirst>
    <pageLast>3336</pageLast>
    <pageNumber/>
    <edition/>
    <issue>7</issue>
    <volume>67</volume>
    <type>articler</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2022-10-11</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Data-Driven Control for Linear Discrete-Time Delay Systems</title>
    <abstract language="eng">The increasing ease of obtaining and processing data together with the growth in system complexity has sparked the interest in moving from conventional model-based control design toward data-driven concepts. Since in many engineering applications time delays naturally arise and are often a source of instability, we contribute to the data-driven control field by introducing data-based formulas for state feedback control design in linear discrete-time time-delay systems with uncertain delays. With the proposed approach, the problems of system stabilization as well as of guaranteed cost and H∞ control design are treated in a unified manner. Extensions to determine the system delays and to ensure robustness in the event of noisy data are also provided</abstract>
    <parentTitle language="eng">IEEE Transactions on Automatic Control</parentTitle>
    <identifier type="issn">1558-2523</identifier>
    <identifier type="url">https://ieeexplore.ieee.org/document/9484756</identifier>
    <identifier type="doi">10.1109/TAC.2021.3096896</identifier>
    <enrichment key="BTU">an der BTU erstellt / created at BTU</enrichment>
    <enrichment key="opus.source">publish</enrichment>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
    <enrichment key="opus.urn.autoCreate">false</enrichment>
    <enrichment key="Fprofil">1 Energiewende und Dekarbonisierung / Energy Transition and Decarbonisation</enrichment>
    <author>
      <firstName>Juan G.</firstName>
      <lastName>Rueda-Escobedo</lastName>
    </author>
    <submitter>
      <firstName>Magda-Emelie</firstName>
      <lastName>Wyslugocki</lastName>
    </submitter>
    <author>
      <firstName>Emilia</firstName>
      <lastName>Fridman</lastName>
    </author>
    <author>
      <firstName>Johannes</firstName>
      <lastName>Schiffer</lastName>
    </author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Data-driven control</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>delay systems</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>robust control</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>sampled data control</value>
    </subject>
    <collection role="institutes" number="3206">FG Regelungssysteme und Netzleittechnik</collection>
  </doc>
  <doc>
    <id>29368</id>
    <completedYear/>
    <publishedYear>2021</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>287</pageFirst>
    <pageLast>293</pageLast>
    <pageNumber/>
    <edition/>
    <issue>19</issue>
    <volume>54</volume>
    <type>conferenceobject_ref</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2022-10-11</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">A Port-Hamiltonian Approach to Modeling and Control of an Electro-Thermal Microgrid</title>
    <abstract language="eng">We address the problems of modeling and controlling multi-energy microgrids (meMGs) composed of an electrical and a thermal system, which are connected via heat pumps (HPs). At first, we model the individual subsystems in a port-Hamiltonian (pH) framework. Then, by exploiting the structural properties of pH systems, we interconnect the subsystems in a passive manner and show that the overall meMG is shifted passive with respect to the control input-output mapping. We then use this property to propose a distributed passivity based-control (PBC) that addresses frequency and temperature regulation by utilizing the resources in the meMG in a proportional fashion and renders the closed-loop equilibrium asymptotically stable.</abstract>
    <parentTitle language="eng">IFAC-PapersOnLine</parentTitle>
    <identifier type="issn">2405-8963</identifier>
    <identifier type="url">https://www.sciencedirect.com/science/article/pii/S2405896321021169</identifier>
    <identifier type="doi">10.1016/j.ifacol.2021.11.092</identifier>
    <enrichment key="BTU">an der BTU erstellt / created at BTU</enrichment>
    <enrichment key="opus.source">publish</enrichment>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
    <enrichment key="opus.urn.autoCreate">false</enrichment>
    <enrichment key="Fprofil">1 Energiewende und Dekarbonisierung / Energy Transition and Decarbonisation</enrichment>
    <author>
      <firstName>Ajay</firstName>
      <lastName>Krishna</lastName>
    </author>
    <submitter>
      <firstName>Magda-Emelie</firstName>
      <lastName>Wyslugocki</lastName>
    </submitter>
    <author>
      <firstName>Johannes</firstName>
      <lastName>Schiffer</lastName>
    </author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Passivity-based control</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>port-Hamiltonian systems</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>multi-energy microgrid</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>district heating systems</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>distributed control</value>
    </subject>
    <collection role="institutes" number="3206">FG Regelungssysteme und Netzleittechnik</collection>
  </doc>
  <doc>
    <id>29370</id>
    <completedYear/>
    <publishedYear>2022</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>1610</pageFirst>
    <pageLast>1616</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject_ref</type>
    <publisherName>IEEE</publisherName>
    <publisherPlace>Piscataway</publisherPlace>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2022-10-11</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">L2-Gain Tuning for the Gradient Descent Algorithm in the Presence of Disturbances</title>
    <abstract language="eng">Due to its simplicity and inexpensive computation, the gradient descent algorithm is one of the most used tools in adaptive control and system identification. Although it has been studied for decades, little has been achieved in terms of tuning methods in the presence of disturbances. One of the main difficulties in its analysis is the time-varying nature of the algorithm. In this work, we contribute in such direction by providing LMI tools for tuning the gradient descent algorithm gain such that a guaranteed upper bound on the L2 -gain with respect to parameter variations and measurement noise is achieved. Two academic examples are provided to illustrate the efficient application of the method.</abstract>
    <parentTitle language="eng">2022 European Control Conference (ECC)</parentTitle>
    <identifier type="isbn">978-3-9071-4407-7</identifier>
    <identifier type="url">https://ieeexplore.ieee.org/document/9838051</identifier>
    <identifier type="doi">10.23919/ECC55457.2022.9838051</identifier>
    <enrichment key="BTU">an der BTU erstellt / created at BTU</enrichment>
    <enrichment key="opus.source">publish</enrichment>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
    <enrichment key="opus.urn.autoCreate">false</enrichment>
    <enrichment key="Fprofil">1 Energiewende und Dekarbonisierung / Energy Transition and Decarbonisation</enrichment>
    <author>
      <firstName>Juan G.</firstName>
      <lastName>Rueda-Escobedo</lastName>
    </author>
    <submitter>
      <firstName>Magda-Emelie</firstName>
      <lastName>Wyslugocki</lastName>
    </submitter>
    <author>
      <firstName>Jaime A.</firstName>
      <lastName>Moreno</lastName>
    </author>
    <author>
      <firstName>Johannes</firstName>
      <lastName>Schiffer</lastName>
    </author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Upper bound</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Gain measurement</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Minimization</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>robustness</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>system identification</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>noise measurement</value>
    </subject>
    <collection role="institutes" number="3206">FG Regelungssysteme und Netzleittechnik</collection>
  </doc>
  <doc>
    <id>29371</id>
    <completedYear/>
    <publishedYear>2022</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>1079</pageFirst>
    <pageLast>1084</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject_ref</type>
    <publisherName>IEEE</publisherName>
    <publisherPlace>Piscataway</publisherPlace>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2022-10-11</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">A Dwell-Time Approach for Grid-Aware Operation of a Distributed Generator in an Islanded DC Microgrid</title>
    <abstract language="eng">We propose a switched control law for a DC-DC Buck converter that enables a grid-aware operation of a distributed generator (DG) in a low-voltage islanded DC microgrid (MG). The qualifier grid-aware means that the DG adjusts its operation mode in dependency of the MG status. The resulting closed-loop system is a switched system, in which the subsystems possess different equilibrium points. By means of a time- and state-dependent switching logic together with dwell-time stability analysis methods, we derive sufficient stability criteria that ensure the existence of a unique and globally exponentially stable equilibrium point of the resulting closed-loop switched system. The performance of the proposed control is illustrated via a numerical example.</abstract>
    <parentTitle language="eng">2022 European Control Conference (ECC)</parentTitle>
    <identifier type="isbn">978-3-9071-4407-7</identifier>
    <identifier type="url">https://ieeexplore.ieee.org/document/9838354</identifier>
    <identifier type="doi">10.23919/ECC55457.2022.9838354</identifier>
    <enrichment key="BTU">an der BTU erstellt / created at BTU</enrichment>
    <enrichment key="opus.source">publish</enrichment>
    <enrichment key="Fprofil">1 Energiewende und Dekarbonisierung / Energy Transition and Decarbonisation</enrichment>
    <author>
      <firstName>Ismael</firstName>
      <lastName>Jaramillo-Cajica</lastName>
    </author>
    <submitter>
      <firstName>Magda-Emelie</firstName>
      <lastName>Wyslugocki</lastName>
    </submitter>
    <author>
      <firstName>Johannes</firstName>
      <lastName>Schiffer</lastName>
    </author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Switched systems</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Low voltage</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Buck converters</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Stability criteria</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Switches</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Microgrids</value>
    </subject>
    <collection role="institutes" number="3206">FG Regelungssysteme und Netzleittechnik</collection>
  </doc>
  <doc>
    <id>29868</id>
    <completedYear/>
    <publishedYear>2022</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber>6</pageNumber>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject_ref</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2023-01-04</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">On Relaxed Conditions of Integral ISS for Multistable Periodic Systems</title>
    <abstract language="eng">A novel characterization of the integral Inputto-&#13;
State Stability (iISS) property is introduced for multistable&#13;
systems whose dynamics are periodic with respect to a part of&#13;
the state. First, the concepts of iISS-Leonov functions and output&#13;
smooth dissipativity are introduced, then their equivalence&#13;
to the properties of bounded-energy-bounded-state and global&#13;
attractiveness of solutions in the absence of disturbances are&#13;
proven. The proposed approach permits to relax the usual&#13;
requirements of positive definiteness and periodicity of the iISSLyapunov&#13;
functions. Moreover, the usefulness of the theoretical&#13;
results is illustrated by a robustness analysis of a nonlinear&#13;
pendulum with a constant bias input and an unbounded statedependent&#13;
input coefficient.</abstract>
    <parentTitle language="eng">Proceedings of the 2021 61st IEEE Conference on Decision and Control (CDC)</parentTitle>
    <identifier type="url">https://hal.archives-ouvertes.fr/hal-03778051/</identifier>
    <enrichment key="BTU">an der BTU erstellt / created at BTU</enrichment>
    <enrichment key="opus.source">publish</enrichment>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
    <enrichment key="opus.urn.autoCreate">false</enrichment>
    <enrichment key="Fprofil">1 Energiewende und Dekarbonisierung / Energy Transition and Decarbonisation</enrichment>
    <author>
      <firstName>Jesus</firstName>
      <lastName>Mendoza-Avila</lastName>
    </author>
    <submitter>
      <firstName>Johannes</firstName>
      <lastName>Schiffer</lastName>
    </submitter>
    <author>
      <firstName>Denis</firstName>
      <lastName>Efimov</lastName>
    </author>
    <author>
      <firstName>Angel</firstName>
      <lastName>Mercado-Uribe</lastName>
    </author>
    <author>
      <firstName>Johannes</firstName>
      <lastName>Schiffer</lastName>
    </author>
    <collection role="institutes" number="3206">FG Regelungssysteme und Netzleittechnik</collection>
  </doc>
</export-example>
