Multi-Time Scale Frequency Regulation Control Strategy Based on Frequency Active Support of Wind Turbines
Aiming at the problems of system inertia reduction and frequency regulation capacity reduction at the sending-end of large-scale wind power via the ultra-high voltage direct current(UHVDC)transmission system,a multi-time scale coordinated control strategy of doubly-fed wind turbines and traditional synchronous units jointly supporting the sending-end system frequency is proposed,so as to effectively improve the stability of system frequency.According to the frequency regulation reserve capacity of synchronous units and disturbance power,the sending-end system frequency regulation demand in different scenarios is analyzed,and the multi-time scale frequency regulation control strategy based on frequency active support of wind turbines considering the frequency regulation dead zone is proposed,and the coordination and cooperation between variable speed control and propeller distance angle control are realized through the reasonable design of the limiting link and switching logic.And based on the reserve capacity of traditional synchronous units,the frequency regulation dead zone value of doubly-fed wind turbines is designed,so that it can adaptively switch the inertia support and primary frequency regulation for different scenarios,and realize the optimal utilization of frequency regulation resources.The dynamic response process of doubly-fed wind turbine and synchronous machine participating in frequency regulation is analyzed,which further proves its superiority.Finally,the large-scale wind power via the UHVDC transmis-sion system simulation model is built based on RTLAB real-time digital simulation platform,which verifies the effectiveness of the proposed control strategy.
doubly-fed wind turbinesinertia supportprimary frequency regulationcoordinated controlfrequency stability
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