Yansheng Zou, K. Xiao, Zhen Wang, Guangyuan Yang, Ning Liang, Longlong Deng
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A Supplementary Frequency-Voltage Controller for Improving the Stability of MMC-HVDC Connected Weak Receiving Power Grid
The active power and reactive power of modular multilevel converter based HVDC (MMC-HVDC) can be decoupled independently, and can be rapidly controlled. Based on this characteristic, a supplementary frequency-voltage controller (SFVC) is designed to improve the frequency and voltage stability of MMC-HVDC connected to the weak receiving system. A detailed electromagnetic transient model is built in PSCAD. The simulation results of different disturbance locations and time durations show that the SFVC can quickly restore the frequency and voltage stability of the receiving system. The effectiveness and superiority of the proposed SFVC are proved.
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