Xiangsheng Lei, Yanfeng Wang, Xinghua Wang, Fan Yang, and Hanxuan Liu
Offshore wind power, active distribution network, frequency response, invested system frequency response, response time
Due to the advantages of environmental protection and economy in offshore wind power generation, the installed capacity has been increasing year by year. However, offshore wind power generation is a fluctuating new energy source that is not limited by plans, and its output has randomness and volatility. After power is connected to the active distribution network through power converters, it cannot directly respond to frequency changes caused by active distribution network parameters, resulting in frequency instability. This article conducts research on this issue. Firstly, the current research status of frequency response in offshore wind power generation was analysed, and the reasons for frequency fluctuations were discussed in depth. A mathematical model of frequency response in offshore wind power generation was established. A frequency stabilisation strategy based on virtual system frequency response (VSFR) was proposed, and the algorithm flowchart and implementation method of the strategy were provided. Numerical analysis shows that the VSFR frequency stabilisation strategy can stabilise the frequency of the grid-connected system at 50.02 Hz. This strategy has been successfully applied to the world’s largest and longest transmission distance offshore wind power project. Practical applications have shown that the frequency modulation performance of the offshore wind power grid-connected system based on this strategy is superior to traditional thermal power units.
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