Research on Distributed Energy Optimization Method of Distribution Network for Multi-Dimensional Power Quality Improvement

A distributed energy grid-connected inverter co-optimisation method based on multi-dimensional power quality assessment is proposed to address the power quality management problem. Considering the mechanism of different index weights on power quality, a dynamic weight-based power quality assessment model is proposed. The proposed power quality comprehensive index includes total harmonic distortion rate, voltage change rate and three-phase unbalance degree. On this basis, considering the decentralized governance characteristics of distributed energy grid-connected inverters for power quality, a multi-dimensional power quality multi-objective optimization model of distribution network based on multi-functional grid-connected inverters is proposed by using the adjustable capacity margin of distributed energy grid-connected inverters. The model can simultaneously optimize the multi-dimensional power quality of the distribution network and the power generation of the grid-connected inverter. The model solving algorithm based on NSGA-II is studied. This method fully takes into account the inverter control effect and the multi-dimensional power quality improvement effect of the distribution network.