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  <doc>
    <id>23045</id>
    <completedYear/>
    <publishedYear>2018</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject_ref</type>
    <publisherName>IEEE</publisherName>
    <publisherPlace>Piscataway, NJ</publisherPlace>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2019-01-09</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">A Consensus-Based Control Law for Accurate Frequency Restoration and Power Sharing in Microgrids in the Presence of Clock Drifts</title>
    <parentTitle language="eng">2018 European Control Conference, (EEC) 12-15 Jun 2018, Limassol, Cyprus</parentTitle>
    <identifier type="doi">10.23919/ECC.2018.8550191</identifier>
    <identifier type="isbn">978-3-9524-2698-2</identifier>
    <enrichment key="BTU">nicht an der BTU erstellt / not created at BTU</enrichment>
    <author>
      <firstName>Johannes</firstName>
      <lastName>Schiffer</lastName>
    </author>
    <submitter>
      <firstName>Tino</firstName>
      <lastName>Fischer</lastName>
    </submitter>
    <author>
      <firstName>Ajay</firstName>
      <lastName>Krishna</lastName>
    </author>
    <author>
      <firstName>Jörg</firstName>
      <lastName>Raisch</lastName>
    </author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Microgrids</value>
    </subject>
    <collection role="institutes" number="3206">FG Regelungssysteme und Netzleittechnik</collection>
  </doc>
  <doc>
    <id>23929</id>
    <completedYear/>
    <publishedYear>2017</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>508</pageFirst>
    <pageLast>515</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject_ref</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2019-04-15</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Steady State Evaluation of Distributed Secondary Frequency Control Strategies for Microgrids in the Presence of Clock Drifts</title>
    <abstract language="eng">Secondary frequency control, i.e., the task of restoring the network frequency to its nominal value following a disturbance, is an important control objective in microgrids. In the present paper, we compare distributed secondary control strategies with regard to their behaviour under the explicit consideration of clock drifts. In particular we show that, if not considered in the tuning procedure, the presence of clock drifts may impair an accurate frequency restoration and power sharing. As a consequence, we derive tuning criteria such that zero steady state frequency deviation and power sharing is achieved even in the presence of clock drifts. Furthermore, the effects of clock drifts of the individual inverters on the different control strategies are discussed analytically and in a numerical case study.</abstract>
    <parentTitle language="eng">25th Mediterranean Conference on Control and Automation</parentTitle>
    <identifier type="url">http://eprints.whiterose.ac.uk/115991/</identifier>
    <identifier type="doi">10.1109/MED.2017.7984168</identifier>
    <identifier type="issn">2473-3504</identifier>
    <enrichment key="BTU">nicht an der BTU erstellt / not created at BTU</enrichment>
    <enrichment key="Artikelnummer">INSPEC Accession Number: 17046405</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>Ajay</firstName>
      <lastName>Krishna</lastName>
    </author>
    <author>
      <firstName>Christian A.</firstName>
      <lastName>Hans</lastName>
    </author>
    <author>
      <firstName>Jörg</firstName>
      <lastName>Raisch</lastName>
    </author>
    <author>
      <firstName>Thomas</firstName>
      <lastName>Kral</lastName>
    </author>
    <collection role="institutes" number="3206">FG Regelungssysteme und Netzleittechnik</collection>
  </doc>
  <doc>
    <id>24824</id>
    <completedYear/>
    <publishedYear>2019</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber>6</pageNumber>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject_ref</type>
    <publisherName/>
    <publisherPlace>Neapel</publisherPlace>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2019-12-04</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">A consensus-based voltage control for reactive power sharing and PCC voltage regulation in microgrids with parallel-connected inverters</title>
    <abstract language="eng">We consider small-scale power systems consisting of several inverter-interfaced units connected in parallel to a common bus, the point of common coupling (PCC), and sharing a joint load. This is a frequently encountered configuration in microgrid applications. In such a setting, two important control objectives are reactive power sharing and voltage regulation at the PCC. In this paper, we first show that the nonlinear equilibrium equations corresponding to the aforementioned objectives admit a unique positive solution. Then, we propose a consensus-based distributed voltage controller which renders this desired unique solution locally asymptotically stable. Finally, control performance is illustrated via a simulation example.</abstract>
    <parentTitle language="eng">European Control Conference 2019, Naples, Italy</parentTitle>
    <identifier type="doi">10.23919/ECC.2019.8795924</identifier>
    <identifier type="isbn">978-3-907144-00-8</identifier>
    <identifier type="isbn">978-3-907144-01-5</identifier>
    <identifier type="isbn">978-1-7281-1314-2</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>Ajay</firstName>
      <lastName>Krishna</lastName>
    </author>
    <submitter>
      <firstName>Tino</firstName>
      <lastName>Fischer</lastName>
    </submitter>
    <author>
      <firstName>Johannes</firstName>
      <lastName>Schiffer</lastName>
    </author>
    <author>
      <firstName>Nima</firstName>
      <lastName>Monshizadeh</lastName>
    </author>
    <author>
      <firstName>Jörg</firstName>
      <lastName>Raisch</lastName>
    </author>
    <collection role="institutes" number="3206">FG Regelungssysteme und Netzleittechnik</collection>
  </doc>
  <doc>
    <id>24822</id>
    <completedYear/>
    <publishedYear>2020</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>135</pageFirst>
    <pageLast>145</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume>51</volume>
    <type>articler</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2019-12-04</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Distributed Secondary Frequency Control in Microgrids: Robustness and Steady-State Performance in the Presence of Clock Drifts</title>
    <abstract language="eng">Microgrids are distributed systems with high share of inverter-interfaced renewable energy sources where stable and reliable system operation is realized by suitably controlling the inverters. In this work, we focus on secondary frequency control, which is an important ancillary service provided by the inverters. In the literature on secondary frequency control, the effect of clock drifts has often been neglected. However, clock drifts are practically unavoidable parameter uncertainties in inverter-based microgrids and we show that the most commonly employed distributed secondary frequency controllers exhibit performance deteriorations when taking clock drifts explicitly into consideration. Motivated by this, we propose a novel alternative control law called generalized distributed averaging integral (GDAI) control, which achieves the secondary control objectives of steady-state accurate frequency restoration and proportional power sharing in the presence of clock drifts. In addition, we derive a sufficient tuning criterion in the form of a set of linear matrix inequalities (LMIs) which guarantees robust stability of the closed-loop equilibrium point in the presence of uncertain clock drifts. Finally, our analysis is validated extensively via simulation with comprehensive comparisons to other related distributed control approaches.</abstract>
    <parentTitle language="eng">European Journal of Control</parentTitle>
    <identifier type="doi">10.1016/j.ejcon.2019.08.003</identifier>
    <identifier type="issn">0947-3580</identifier>
    <enrichment key="BTU">an der BTU erstellt / created at BTU</enrichment>
    <enrichment key="Fprofil">1 Energiewende und Dekarbonisierung / Energy Transition and Decarbonisation</enrichment>
    <author>
      <firstName>Ajay</firstName>
      <lastName>Krishna</lastName>
    </author>
    <submitter>
      <firstName>Tino</firstName>
      <lastName>Fischer</lastName>
    </submitter>
    <author>
      <firstName>Johannes</firstName>
      <lastName>Schiffer</lastName>
    </author>
    <author>
      <firstName>Jörg</firstName>
      <lastName>Raisch</lastName>
    </author>
    <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>
</export-example>
