基于单周控制的微电网谐波主动治理方法

摘要

微电网中由于存在电力电子设备和非线性负载,其电能质量问题不容忽视.由于分布式电源并网逆变器本质上为一个三相全桥电路,通过对其控制策略的改进,可以使得其在输出电能的同时,还能够实现对电能质量的主动治理.借鉴该思路提出了一种基于单周控制的谐波主动治理方法以抑制公共连接点处的电流谐波.针对多逆变器并联的情况,提出了一种输出电流分摊补偿的控制策略,简化和改进了传统单周控制的控制.在Matlab/Simulink中搭建相应的仿真模型,利用dSPACE搭建实验平台,通过仿真和实验验证了所提方法的正确性与有效性.%Due to the existence of power electronic devices and non-linear loads in microgrids, the power quality problem of microgrids can not be neglected.As the distributed power grid-connected inverter is essentially a three-phase full-bridge circuit, the inverter can not only delivery power, but also control the power quality problems actively.In view of this thought, an active harmonic control method based on one-cycle control is proposed to suppress the current harmonics at the points of common coupling.Aiming at the situation of multiple inverters in parallel, a control strategy of output current apportion compensation is proposed, and the traditional one-cycle control is simplified and improved.Corresponding simulation model set up in Matlab/Simulink and experiments based on dSPACE verify the correctness and validity of the proposed method.