Optimal sizing and siting of distributed photovoltaic in distribution network considering coordinated optimization of reactive power compensation devices
A method for optimal sizing and siting of distributed photovoltaic and energy storage in a distribution network, considering coordinated optimization of reactive power compensation devices, is proposed to address issues such as voltage quality degradation, increased network losses, and reduced photovoltaic absorption capacity caused by improper location and capacity planning of distributed photovoltaic and energy storage.This method first determines the grid connection locations of distributed photovoltaic and energy storage based on network loss sensitivity and dynamic voltage stability index.Subsequently, a collaborative optimization configuration is employed utilizing distributed photovoltaic, energy storage, capacitor banks, and static var compensators, constructing a source-network-storage collaborative optimization bi-level planning model to determine the configuration capacity of distributed photovoltaic and energy storage. Furthermore, to effectively solve this bi-level model, the upper and lower models are transformed into a single-level model through associative modeling, followed by transforming this single-level model into a mixed integer second-order cone programming model using second-order cone relaxation and the Big-M method. Four scenarios are set up for simulation on the IEEE 33-node distribution system. The results indicate that the location and capacity of distributed photovoltaic and energy storagein the distribution network are determined using this method, not only is the photovoltaic absorption capacity and voltage quality improved, but thelifespan of capacitor banks is extended, and network losses are significantly reduced, thus verifying the effectiveness of the method.