Power Distribution Strategy of Multi-functional Energy Storage Power Station in Wind Farm

With the increase in the proportion of new energy installed capacity, the modulation capacity of new energy stations such as frequency modulation and voltage modulation has been paid more and more attention. In view of the problems of primary frequency modulation, power smoothing, and coordinated control of voltage modulation for new energy stations equipped with energy storage, this paper used a clustering algorithm to obtain the energy storage to suppress fluctuating power requirements and set the standby power of frequency modulation for wind storage and voltage modulation for energy storage stations. Secondly, the residual active power for energy storage and the state of charge (SOC) were used to correct the active power of primary frequency modulation for energy storage. Then, based on the reactive power margin for energy storage and the emergency degree of voltage deviation, the reactive power-voltage sag coefficient was modified. Finally, to ensure the frequency modulation effect, the multi-function coordinated operation strategy of energy storage was proposed, involving fluctuation suppression by energy storage, primary frequency modulation, and voltage modulation. Based on Matlab/Simulink, simulation verification was carried out, and the simulation conditions of fluctuation suppression by energy storage and primary frequency modulation, fluctuation suppression by energy storage and voltage modulation, as well as the coordinated operation of the three functions were analyzed, respectively. The results show that the multi-function coordinated operation strategy proposed in this paper can promote the grid frequency, voltage, and SOC recovery under the condition of fluctuation suppression of wind power by energy storage.