Control of VSC-based HVDC Transmission System for Offshore Wind Power Plants
Authors
Stan, Ana-Irina ; Stroe, Daniel-Ioan
Term
4. term
Education
Publication year
2010
Submitted on
2010-06-02
Pages
93
Abstract
Med den stigende efterspørgsel efter elektricitet er store havvindmølleparker en lovende alternativ energikilde. For at føre denne strøm i land og koble den sikkert til elnettet er højspændt jævnstrøm (HVDC) baseret på spændingsstyrede konvertere (VSC) i dag en praktisk og konkurrencedygtig løsning. Denne afhandling beskriver modellering og styring af et VSC-baseret HVDC-anlæg. Der foreslås to styringsmetoder, begge formuleret i det dq-synkrone referencesystem—et matematisk koordinatsystem, der forenkler styring af vekselstrømsignaler ved at følge deres rotation. Systemets stationære og dynamiske egenskaber analyseres gennem cases i MATLAB/Simulink. Simulationsresultaterne valideres derefter på en laboratorieopstilling på 2,2 kW ved hjælp af en dSPACE realtidsplatform.
As electricity demand grows, large offshore wind farms are a promising alternative source of energy. To bring this power ashore and connect it reliably to the grid, High-Voltage Direct Current (HVDC) systems based on Voltage Source Converters (VSC) are currently a practical and competitive solution. This thesis models and controls a VSC-based HVDC link. It proposes two control methods, both formulated in the dq synchronous reference frame—a mathematical coordinate system that simplifies control of AC signals by tracking their rotation. The system’s steady-state and dynamic performance is studied through MATLAB/Simulink case studies. The simulation results are then validated on a 2.2 kW laboratory setup using a dSPACE real-time platform.
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