Abstract
Modern power systems require special features from the distributed energy resources especially to meet the power quality and dynamic security. The distribution static synchronous compensator (DSTATCOM) has a safe DC voltage operating range that is often unexplored. Self-excited induction generators (SEIGs) with a shunt DSTATCOM is a well-known solution for low-power, low-cost generation. These systems may have poor robustness against surges and contingencies. This paper proposes an ancillary controller as a supplement in the shunt compensation of an off-grid distributed generation system powered by SEIGs. The controller consists of a variable structure that uses an adequate DC bus capacitor voltage range to provide fast frequency response (FFR) with soft recovery. The control performance for fault rejection is evaluated as well as for load disturbances and generation contingency. Simulation results are presented to demonstrate system operation and compensator performance.
Zusammenfassung
Moderne Energiesysteme erfordern besondere Eigenschaften der verteilten Energieressourcen, insbesondere um die Netzqualität und die dynamische Sicherheit zu gewährleisten. Der distribution static synchronous compensator (DSTATCOM) verfügt über einen sicheren Gleichspannungs-Betriebsbereich, der oft noch nicht erforscht ist. Selbsterregte Induktionsgeneratoren (SEIGs) mit einem Shunt-DSTATCOM sind eine bekannte Lösung für die kostengünstige Stromerzeugung mit geringer Leistung. Diese Systeme können eine geringe Robustheit gegenüber Überspannungen und Eventualitäten aufweisen. In diesem Beitrag wird ein Hilfsregler als Ergänzung für die Nebenschlusskompensation eines netzunabhängigen, dezentralen Erzeugungssystems mit SEIGs vorgeschlagen. Der Controller besteht aus einer variablen Struktur, die einen geeigneten DC-Bus-Kondensatorspannungsbereich nutzt, um eine schnelle Frequenzreaktion (FFR) mit sanfter Wiederherstellung zu ermöglichen. Bewertet wird die Regelung bei der Fehlerunterdrückung sowie bei Laststörungen und Generatorfehlern. Simulationsergebnisse werden präsentiert, um den Systembetrieb und die Kompensationsleistung zu demonstrieren.
Funding source: CNPq
Award Identifier / Grant number: 465640/2014-1
Funding source: CAPES
Award Identifier / Grant number: 23038.000776/2017-54
Funding source: FAPERGS
Award Identifier / Grant number: 17/2551- 0000517-1
Funding source: CAPES/PROEX
Award Identifier / Grant number: 001
About the authors
Gabriel Maier Cocco received his B.Sc. degree (2018) in Electrical Engineering from the Federal University of Pampa, Alegrete, Brazil, and the M.Sc. degree (2021) from the Federal University of Santa Maria (UFSM), Santa Maria, Brazil. Currently, he is working towards a Ph.D. degree at UFSM with the Power Electronics and Control Research Group (GEPOC). His research interests include renewable power generation and processing, system modeling, control, and modulation of power converters.
Fábio Ecke Bisogno received his M.Sc. degree in electrical engineering from the Federal University of Santa Maria (UFSM), Santa Maria, in 2001, and the Ph.D. degree in electrical engineering from Technische Universität Chemnitz, Chemnitz, Germany, in 2006. He worked at Fraunhofer Institute, Germany, from 2003 to 2009. Since 2009, he has been a Professor at UFSM, where he has worked on power electronics in lighting, resonant converters, self-oscillating systems, piezoelectric transformers, uninterruptible power supply (UPS), and other topics in research and industry research and development projects.
Robinson Figueiredo de Camargo is the Head of the Department of Electric Power Processing at the Federal University of Santa Maria, Brazil. He received his B.Sc. (2000), M.Sc. (2002), and Ph.D. (2006) degrees in electrical engineering from the Federal University of Santa Maria. He was the Coordinator of the Undergraduate Program in Control and Automation Engineering from 2010 to 2012. His areas of interest include renewable energy sources, synchronization methods, power quality, DSTATCOM, and active power filters.
Eric Glende holds an MSc. degree in Electrical Energy Systems - Renewable Energies from Otto-von-Guericke University Magdeburg (OVGU) in Germany. He is currently employed at OVGU as a research assistant at the Chair of Electrical Networks and Renewable Energy and is pursuing a Ph.D. in the field of deployment concepts for HVDC systems in the German transmission network. He is a member of the IEEE Germany section and is actively involved in the IEEE Student Branch Magdeburg as well as the VDE. His research interests include HVDC systems and network calculations.
Martin Wolter has been the Head of the Chair of Electrical Networks and Renewable Energy at Otto-von-Guericke University Magdeburg since 2015. He received the Diploma, Ph.D., and venia legendi degrees from Leibniz University Hannover, Hannover, in 2006, 2008, and 2012, respectively. He was the Head of the System Operation Concept Development Team, 50Hertz Transmission GmbH, for four years. His research interests include modeling and simulation of interconnected electric power systems, development of planning and operation strategies, and multiagent systems.
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Research ethics: Not applicable.
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Author contributions: The authors have accepted responsibility for the entire content of this manuscript and approved its submission.
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Competing interests: The authors state no conflict of interest.
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Research funding: This work was supported in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES/PROEX) - Finance Code 001, and in part by INCT-GD and its funding agencies (CNPq process no 465640/2014-1, CAPES process no 23038.000776/2017-54 and FAPERGS process no 17/2551-0000517-1).
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Data availability: Not applicable.
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