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Wind farms located in remote areas have the problems of weak stability and low grid-connection strength due to the long electrical distance from large power grids and small Short-Circuit Ratio (SCR). Grid-Forming Control technology (GFM) has the characteristics of voltage support and active inertia, which can replace synchro to realize grid support and maintain the stability of power system. Therefore, GFM has broad development and application prospects in new energy power system. Based on this, this paper proposes a grid-forming energy storage system with hybrid ultracapacitors as the energy storage medium and virtual synchronous machine (VSG) control as the control strategy. The energy storage system is connected to the AC side of the wind farm, which can coordinate the energy storage to ensure that the system can smooth the frequency fluctuations and Reduce the Rate of Change of Frequency (ROCOF) when the wind resources fluctuate and the system switches the load. Raise the lowest frequency point; Provide frequency and voltage support when short circuit fault occurs in the system, prevent frequency collapse, and improve the success rate of Low Voltage Ride-Through (LVRT) of wind turbines. Improve grid-connected strength. Finally, based on the MATLAB/Simulink simulation platform, the good dynamic response ability of the energy storage system under the above-mentioned working conditions in each short-circuit ratio scenario is verified.
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Ma et al. (2024) studied this question.
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