A Coordinated Control Method for Energy Storage Inverters Based on Centralized Control Strategy
Due to the long network state recovery time and poor control effect of existing control methods,this study fo-cuses on a centralized control strategy-based method of coordinated controlling energy storage inverters.Based on different energy storage units in the microgrid,centralized energy storage is used to form a generation unit,which is connected to the AC bus of the energy storage system through an inverter.By combining DAB topology structure,high-frequency volt-age square waves are formed by switching the bridge arm,and the phase difference generated by the voltage square wave is further controlled to maintain a certain amount of transmission energy in the transformer.By using droop control for voltage control,voltage and frequency reference values of ES are obtained.The introduction of secondary control adjusts and corrects the calculated control variables to ensure the stability of the system.In the test the experimental group a-chieves completion of communication link fault repair and recovery of normal network status within 20 s,indicating a sat-isfactory control utility with timely voltage control.
NETL
NSTL
万方数据
