Research On Steady-State Voltage Control Strategy Of Distribution Network Based On Distributed Photovoltaic And Reactive Power Optimal Configuration

In 2019,domestic distributed photovoltaics power generation reached 54.5 billion kWh,a year-on-year increase of 39.4%.The integration of large-scale distributed photovoltaics into the distribution network can improve energy utilization and reliability of power supply on the one hand,and meet the growing demand for electricity.On the other hand,it will also cause the distribution network to change from a traditional single-power radial structure to a multi-power weak-ring structure,coupled with the uncertainty and intermittency of light,the voltage distribution of the distribution network has changed.Studying the influence of distributed photovoltaic grid-connected on the voltage of the distribution network and related control strategies are of great significance for improving the voltage quality of the distribution network.In order to improve the voltage quality of the distribution network with distributed photovoltaic,this paper proposes the corresponding steady-state voltage control strategy,mainly to study the two aspects of distributed photovoltaic optimal configuration and distribution network reactive power optimization.Firstly,the simulation model of photovoltaic grid-connected power generation system is built in PSCAD/EMTDC simulation software,the influence of distributed photovoltaic grid-connected on distribution network voltage is analyzed,and the position and capacity of photovoltaic grid-connected are changed in the classic IEEE33 node distribution network system to study the voltage variation of each node of the distribution network.Secondly,in order to improve the stability of the static voltage of the distribution network containing distributed photovoltaic and reduce the network loss during operation,an improved particle swarm optimization(PSO)algorithm with parameter adaptive adjustment strategy is introduced,through the optimal configuration research of the distribution network containing distributed photovoltaic,the optimal configuration plan of photovoltaic grid-connected location and capacity is obtained.Finally,after determining the optimal active power output and grid-connected location of distributed photovoltaic,considering that distributed photovoltaic has a certain reactive power output capability,using the improved PSO algorithm to control reactive power output of distributed photovoltaic,optimize output of the reactive power compensation device in the distribution network,as well as coordinated optimization of the distributed photovoltaic and reactive power compensation device,these four schemes perform reactive power optimization on the distribution network.The research results show that the improved PSO algorithm with adaptive parameter adjustment strategy has a fast convergence rate and high accuracy for solving the optimal configuration problem of distributed photovoltaic.At the same time,the algorithm can well realize the coordinated control of reactive power output of distributed photovoltaic and output of reactive power compensation device,and can effectively improve the voltage deviation and network loss of the distribution network,improve the voltage quality of the distribution network,and make the distribution network operate in the best state.