基于二次控制的微电网电压不平衡补偿策略

摘要

To solve the 3-phase voltage unbalance of point of common coupling(PCC) in the microgrid,the method of distributed secondary control(DSC) used to compensate the voltage unbalance is proposed.Based on the communication technology and hierarchical control theory,an architecture of DSC is introduced.Distributed secondary controller embedded in each distributed generation(DG) primary control layer,through the network and the secondary controller to exchange information in each other,generating appropriate control signals to primary control.Comparing to the centralized control system,DSC reduces the high bandwidth requirements,improves the microgrid reliability and extended flexibility.This method not only compensates for the voltage of the PCC,but also improves the accuracy of power sharing.The simulation and experimental results show the effectiveness and feasibility of the proposed method.%针对微网公共耦合点(PCC)电压三相不平衡问题,提出电压不平衡分布式二次控制(DSC)策略.基于通信技术和分层控制理论,建立了分布式分层控制体系结构.DSC嵌入在每个分布式发电单元(DG)中的一次控制层,通过网络与相邻的二次控制器交换信息,并产生适当的控制信号传递给一次控制,相较子集中控制,降低了系统对高带宽的要求,提高了微网的可靠性和扩展的灵活性.该方法可很好地对PCC的电压进行补偿.仿真及实验验证了所提方法的有效性和可行性.