TY - GEN A1 - Alghamdi, Sultan A1 - Markovic, Uros A1 - Stanojev, Ognjen A1 - Schiffer, Johannes A1 - Hug, Gabriela A1 - Aristidou, Petros T1 - Wide-Area Oscillation Damping in Low-Inertia Grids under Time-Varying Communication Delays T2 - 21st Power Systems Computation Conference, Porto, Portugal — June 29 – July 3, 2020 N2 - 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. Y1 - 2020 UR - https://www-docs.b-tu.de/fg-regelungssysteme/public/Publications/Widearea_oscillation.pdf ER - TY - GEN A1 - Schiffer, Johannes A1 - Efimov, Denis T1 - A new criterion for boundedness of solutions for a class of periodic systems T2 - 17th European Control Conference (ECC), Limassol, Cyprus, 2018 Y1 - 2018 UR - https://hal.inria.fr/hal-01755084/document ER - TY - GEN A1 - Alghamdi, Sultan A1 - Schiffer, Johannes A1 - Fridman, Emilia T1 - Conditions for Delay-Robust Consensus-Based Frequency Control in Power Systems with Second-Order Turbine-Governor Dynamics T2 - 57th IEEE Conference on Decision and Control, Miami Beach, FL, USA, December 17-19, 2018 N2 - Consensus-based distributed secondary frequency control schemes have the potential to simultaneously ensure real-time frequency restoration and economic dispatch in future power systems with large shares of renewable energy sources. Yet, due to their distributed nature these control schemes critically depend on communication between units and, thus, robustness with respect to communication uncertainties is crucial for their reliable operation. Furthermore, when applied in bulk power systems the control design and analysis should take higher-order turbine-governor dynamics of the generation units explicitly into account. Both aspects have not been addressed jointly in the existing literature. Motivated by this, we derive conditions for robust stability of a consensus-based distributed frequency control scheme applied to a power system model with second-order turbine-governor dynamics in the presence of heterogeneous time-varying communication delays and dynamic communication topology. The result is established by a novel coordinate transformation and reduction to eliminate the invariant subspace in the closed-loop dynamics and by constructing a strict common Lyapunov-Krasovskii functional. Y1 - 2018 UR - https://ieeexplore.ieee.org/document/8619709 SN - 978-1-5386-1395-5 SP - 786 EP - 793 PB - IEEE CY - Piscataway, NJ ER - TY - GEN A1 - Schiffer, Johannes A1 - Efimov, Denis A1 - Barabanov, Nikita A1 - Ortega, Romeo T1 - A Relaxed Characterization of ISS for Periodic Systems with Multiple Invariant Sets T2 - European Journal of Control N2 - A necessary and sufficient criterion to establish input-to-state stability (ISS) of nonlinear dynamical systems, the dynamics of which are periodic with respect to certain state variables and which possess multiple invariant solutions (equilibria, limit cycles, etc.), is provided. Unlike standard Lyapunov approaches, the condition is relaxed and formulated via a sign-indefinite function with sign-definite derivative, and by taking the system’s periodicity explicitly into account. The new result is established by using the framework of cell structure and it complements the ISS theory of multistable dynamics for periodic systems. The efficiency of the proposed approach is illustrated via the global analysis of a nonlinear pendulum with constant persistent input. Y1 - 2017 U6 - https://doi.org/10.1016/j.ejcon.2017.04.002 SN - 1435-5671 VL - Vol. 37 SP - 1 EP - 7 ER - TY - GEN A1 - Schiffer, Johannes A1 - Efimov, Denis A1 - Ortega, Romeo T1 - Almost Global Synchronization in Multi-Machine Power Systems T2 - 57th IEEE Conference on Decision and Control, Miami Beach, FL, USA, December 17-19, 2018 Y1 - 2018 UR - https://ieeexplore.ieee.org/document/8619788 SN - 978-1-5386-1395-5 U6 - https://doi.org/10.1109/CDC.2018.8619788 SP - 800 EP - 805 PB - IEEE CY - Piscataway, NJ ER - TY - GEN A1 - Dewi, Sari T1 - Integration PV and wind into the grid to supply electricity in Palu (Indonesia) T2 - Applied Mechanics and Materials Y1 - 2015 U6 - https://doi.org/10.4028/www.scientific.net/AMM.747.337 SN - 1662-7482 N1 - ICSEBS, 24.11. - 27.11.2014, Bali VL - 747 SP - 337 EP - 340 ER - TY - CHAP A1 - Noureldin, Amer Abdelfattah Ali A1 - Lappus, Gerhard A1 - Berger, Ulrich T1 - Applications of Neural Network and Fuzzy Technologies to Process Control T2 - Proceedings of 7th IEEE International Conference on Intelligent Engineering Systems, Assiut - Luxor, Egypt March 4-6, 2003 Y1 - 2003 SN - 977-246-048-3 PB - IEEE CY - Assiut ER - TY - THES A1 - Schmuck, Jörg T1 - Entwurf einfach strukturierter Regler mit Robustheitskriterien im Frequenzbereich KW - Robuste Regelung KW - Frequenzbereichskriterien KW - PI-Regler Y1 - 2005 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:co1-000000659 ER - TY - CHAP A1 - Sweelem, Emar A. ED - McNelis, Bernard T1 - Optimization sizing of PV Wind-Diesel Hybrid Energy Systems T2 - Seventeenth European Photovoltaic Solar Energy Conference, proceedings of the international conference held in Munich, Germany, 22 - 26, October 2001, Vol. 2 Y1 - 2001 SN - 3-936338-07-8 SN - 88-900442-3-3 SP - 2107 EP - 2110 PB - WIP-Renewable Energies [u.a.] CY - München [u.a.] ER - TY - GEN A1 - Würfel, Hans A1 - Lorenz-Meyer, Nicolai A1 - Schiffer, Johannes T1 - Experimentally Validated Reduced-Order Models for Grid-Connected Inverters Using Balanced Residualization T2 - 2023 8th IEEE Workshop on the Electronic Grid (eGRID), Karlsruhe, Germany, 16-18 October 2023 Y1 - 2023 SN - 979-8-3503-2700-7 U6 - https://doi.org/10.1109/eGrid58358.2023.10380931 CY - Karlsruhe ER - TY - GEN A1 - Rueda-Escobedo, Juan G. A1 - Metzkow, René A1 - Schiffer, Johannes T1 - Robust current control of IPMSM drives under uncertain and varying inductances T2 - Automatica N2 - Interior permanent magnet synchronous machines (IPMSMs) are gaining popularity in e-mobility applications due to their wide constant power speed range when compared with other electric motors. The high-performance of IPMSMs is due to the pronounced degree of magnetic saliency, which originates from embedding their magnets inside the rotor. Yet, this feature complicates their control since it increases nonlinear phenomena such as cross-magnetization and saturation. This results in pronounced variations of the machine inductances, which are highly dependent on the machine current. This behaviour is of particular relevance in e-mobility applications, where a highly dynamic operation of the machine is required. In contrast to most existing current control approaches, where precise inductance knowledge is required, we address this challenge by deriving a controller that exploits the machine dynamics to achieve exponential current tracking in the presence of unknown and varying inductances. By interpreting the flux linkage as a modelled disturbance, we propose a dynamic compensator based on the internal model principle. As a by-product, the method provides an estimate of the flux linkage. The gain in performance compared to the standard PI controller is illustrated in simulation. Y1 - 2023 U6 - https://doi.org/10.1016/j.automatica.2023.110998 SN - 0005-1098 VL - 152 ER - TY - GEN A1 - Zurita-Bustamante, Erik W. A1 - Rueda-Escobedo, Juan G. A1 - Schiffer, Johannes T1 - Passivity-Based Conditions for Asymptotic Stability of Speed Control for Three-Phase and Dual Three-Phase Permanent Magnet Synchronous Motors T2 - 62nd IEEE Conference on Decision and Control (CDC), 2023 Y1 - 2023 SN - 979-8-3503-0124-3 SN - 979-8-3503-0123-6 U6 - https://doi.org/10.1109/CDC49753.2023.10383817 SN - 2576-2370 ER - TY - GEN A1 - Jeeninga, Mark A1 - Machado, Juan Eduardo A1 - Cucuzzella, Michele A1 - Como, Giacomo A1 - Scherpen, Jacquelien T1 - On the existence and uniqueness of steady state solutions of a class of dynamic hydraulic networks via actuator placement T2 - 62nd IEEE Conference on Decision and Control (CDC), 2023 Y1 - 2023 SN - 979-8-3503-0124-3 SN - 979-8-3503-0123-6 U6 - https://doi.org/10.1109/CDC49753.2023.10384050 SN - 2576-2370 ER - TY - GEN A1 - Mendoza-Avila, Jesus A1 - Efimov, Denis A1 - Mercado-Uribe, Angel A1 - Schiffer, Johannes T1 - Design of Controls for Boundedness of Trajectories of Multistable State Periodic Systems T2 - 62nd IEEE Conference on Decision and Control (CDC), 2023 Y1 - 2023 SN - 979-8-3503-0124-3 SN - 979-8-3503-0123-6 U6 - https://doi.org/10.1109/CDC49753.2023.10383528 SN - 2576-2370 ER - TY - GEN A1 - Mercado-Uribe, Angel A1 - Mendoza-Ávila, Jesús A1 - Efimov, Denis A1 - Schiffer, Johannes T1 - A Control Leonov Function Guaranteeing Global ISS of Two Coupled Synchronverters T2 - 62nd IEEE Conference on Decision and Control (CDC), 2023 Y1 - 2023 SN - 979-8-3503-0124-3 SN - 979-8-3503-0123-6 U6 - https://doi.org/10.1109/CDC49753.2023.10383811 SN - 2576-2370 ER - TY - GEN A1 - Jaramillo-Cajica, Ismael A1 - Mercado-Uribe, Angel A1 - Schiffer, Johannes T1 - Coordinated Control of Load Tap Changer Transformers for Voltage Regulation and Voltage Hunting Prevention: A Switched Systems Approach T2 - 62nd IEEE Conference on Decision and Control (CDC), 2023 Y1 - 2023 SN - 979-8-3503-0124-3 SN - 979-8-3503-0123-6 U6 - https://doi.org/10.1109/CDC49753.2023.10383763 SN - 2576-2370 ER - TY - GEN A1 - Nattke, Matthias A1 - Rotta, Randolf A1 - Natarov, Roman A1 - Archila, Oscar A1 - Mykytyn, Pavlo T1 - Precise sensors for localization in the drone swarm T2 - Proceedings iCCC2024 - iCampµs Cottbus Conference, 2024-05-14 - 2024-05-16, Cottbus N2 - Drones can be connected as a swarm to precisely monitor large agricultural areas and manage them more sustainable. They test sensor technology in real environments and solve complex tasks faster. Key aspects include accurate localization, reliable communication, and dynamic flight control. The localization accuracy of RTK-GNSS-enabled system, which includes GPS, GLONASS, GALILEO positioning systems is compared with Ultra-Wideband (UWB) one. The UPWARDS communication hub is presented as a processing and connection point across swarm agents. This controller also incorporates collision avoidance features and testing of evasion strategies. KW - ROS KW - GNSS KW - UWB KW - communication hub KW - UAV swarm Y1 - 2024 UR - https://www.ama-science.org/proceedings/details/4724 SN - 978-3-910600-00-3 U6 - https://doi.org/10.5162/iCCC2024/P16 VL - 2024 SP - 166 EP - 169 PB - AMA ER - TY - GEN A1 - Shahin, Keyvan A1 - Rotta, Randolf A1 - Archila, Oscar A1 - Mykytyn, Pavlo A1 - Nattke, Matthias A1 - Reichenbach, Marc A1 - Nolte, Jörg A1 - Natarov, Roman T1 - A Modular Communication Architecture for Adaptive UAV Swarms T2 - 2023 IEEE International Conference on Omni-layer Intelligent Systems (COINS) N2 - Small Unmanned Aerial Vehicles (UAVs) have vast application potential from industrial logistics and disaster monitoring to smart farming, for example, to create maps with Normalized Difference Vegetation Index (NDVI) cameras and AI-based image classification or the precision spot application of fertilizers. Operating multiple UAVs in parallel, including those with different specializations, enables efficient coverage of large areas. While existing research focused mainly on predefined flight formations for swarms or autonomous missions for single UAVs, the focus of this work is on multiple UAVs with individually adaptable missions. We derive communication system requirements from swarm coordination algorithms and present a respective design. The resulting modular architecture enables future research on autonomous adaptive UAV swarms and their use as flying sensor platforms. Y1 - 2023 SN - 979-8-3503-4647-3 SN - 979-8-3503-4648-0 U6 - https://doi.org/10.1109/COINS57856.2023.10189245 PB - IEEE CY - Berlin ER -