A Comprehensive Power Quality Control Strategy for Microgrid Based on Three-phase Multi-function Inverters

Abstract

A comprehensive power quality control strategy is proposed based on three-phase multi-function inverters (TPMFI) in this paper. By combining active disturbance rejection controller and repetitive controller, an LADRC+RC inner loop with fast response and high accuracy is established. Based on the good performance of LADRC+RC inner loop, a droop controller for TPMFI, with the functions of power quality compensation and power output, is proposed. Stability of microgrid is therefore guaranteed. Finally, on basis of a stable microgrid, a method for allocating compensation volume is proposed based on entropy-Shapely quadratic weight correction. The proposed allocation method is able to optimize the overall power quality of microgrid in real time. Simulink simulations verify that the proposed comprehensive power quality control strategy can guarantee stability of microgrid and enhance power quality of microgrid at the same time.