Node Sensitivity Analysis Method for Power Quality Control of High Proportion Distributed Photovoltaic Access Distribution Network

Composite energy storage device is an effective method to solve series power quality problems caused by the excessive proportion of decentralized photovoltaic power generation incorporated into the distribution network, such as instantaneous power, voltage and harmonic pollution. A node sensitivity analysis method for power quality control of high-proportion distributed photovoltaic access distribution network is proposed, and the location and size of composite energy storage devices are quickly solved. Firstly, an optimization planning model for location and capacity of composite energy storage devices is established, which includes multi-objective optimization functions such as node voltage deviation, current total harmonic distortion rate and installation cost. Secondly, the sensitivity analysis method is used to preprocess all nodes to reduce the number of candidate nodes, and the feasible installation node alternative set of the composite energy accumulation device optimization planning model is obtained. In the process of using the improved multiobjective particle swarm optimization algorithm to solve the model, the amount of calculation is greatly reduced and the optimization efficiency is improved. Finally, taking IEEE 33 - bus distribution system as an example, the simulation results show the superiority of the node sensitivity analysis method.