An Optimized Voltage Support Strategy for PMSG-Based Wind Turbines under Unbalanced Grid Fault
2023 IEEE 14th International Symposium on Power Electronics for Distributed Generation Systems (PEDG)(2023)
摘要
Reactive power is normally injected into grid to support voltages under unbalanced grid fault. However, the non-fault phase voltage is increased with only positive sequence reactive power injection, and the degree of three-phase voltages unbalance is deepened. Therefore, it is necessary to inject negative sequence reactive power to suppress the rise of non-fault phase voltage. To address this problem, an optimized strategy based on second harmonic active-power suppress control (HAPSC) and voltage unbalance factor (VUF) is proposed. The main advantages of improved strategy are reducing the degree of three-phase voltages unbalance and supporting voltages. Simulation in PSCAD/EMTDC is used to verify the effectiveness of the proposed control strategy.
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关键词
unbalanced fault,voltage support control,wind turbines,positive and negative sequence currents injection
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