基于集中式控制策略的储能变流器牵制协调控制方法

A Coordinated Control Method for Energy Storage Inverters Based on Centralized Control Strategy

针对现有的控制方法网络状态恢复时间较久、控制效果差,研究了基于集中式控制策略的储能变流器牵制协调控制方法。根据微电网中不同储能单元情况,采用集中式储能形成一个发电单元,通过变流器将单元接入储能系统的交流母线。结合DAB拓扑结构,通过控制桥臂的通断形成高频的电压方波,然后控制电压方波产生的相位差,使得变压器保持一定的传输能量。运用下垂控制进行电压控制,得到ES的电压和频率参考值。引入二次控制,将计算得到的控制量进行调整从而保证了系统的稳定性。实验结果表明,实验组在20s时通信链路故障修复完成,网络状态恢复正常,及时实现电压的控制目标,达到了良好的控制效果。

Due to the long network state recovery time and poor control effect of existing control methods,this study focuses 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 voltage 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 achieves completion of communication link fault repair and recovery of normal network status within 20 s,indicating a satisfactory control utility with timely voltage control.