Research On Multi-objective Optimal Configuration Method Of Distributed Photovoltaic Power In Distribution Network

Vigorously developing and reasonably consuming distributed photovoltaic power sources locally is one of the important ways to build a new power system based on new energy generation.The power of photovoltaic power generation has periodic and intermittent fluctuations that change with light.The random superposition of the power characteristics of distributed photovoltaic power generation in the medium.Thus,the voltage quality,safety and stability and economic operation of the distribution network will be affected.This paper mainly studies the optimization problem,aiming at the economic operation of the distribution network and the maximum utilization of photovoltaic power.First,it discusses the intermittent volatility of distributed photovoltaic power generation,and then analyzes the influence of the access position and power generation of distributed photovoltaic power generation on the voltage quality and power loss of the distribution network.The optimization of distributed photovoltaic power generation access to the distribution network provides a theoretical basis.Based on the Beta distribution characteristics of light,a photovoltaic power output model was constructed,and a load power daily fluctuation model was constructed based on the normal distribution model of the load.The node types of distributed photovoltaic power sources and their unified conversion method to PQ nodes were summarized.The power flow equation of the distributed photovoltaic power distribution network is analyzed,and the forward and backward power flow solving algorithm is analyzed,which lays the foundation for the parameter optimization of the distributed photovoltaic power distribution network.Combining actual engineering requirements,taking into account the time series changes of illumination and load power,the paper uses the improved particle swarm optimization algorithm to study the optimization of the best access location under the given photovoltaic capacity and the given photovoltaic access location Optimization of the maximum accessible capacity under conditions.Position optimization takes the network power balance,node voltage qualified and current not to exceed the allowable value constraints,and according to the optimization calculation results,three optimal results are given in order to combine with other actual conditions.Factor overall choice.The capacity optimization takes the maximum photovoltaic installation capacity as the goal,and takes the network power balance,node voltage qualification and stability margin value as the constraint conditions,and gives the maximum accessible photovoltaic capacity.Taking a typical IEEE-33 node network as an example,an optimization calculation software was compiled based on Matlab,and the location and capacity optimization of distributed photovoltaic power sources were carried out.Comparing the weak node voltage stability margin,power loss,and node voltage before and after the optimization of the distributed photovoltaic power supply location and the connection capacity,the results show that the reasonable and orderly connection of distributed photovoltaic power can be based on the safe,stable and economic operation of the power grid.,Maximize the power generation capacity of distributed photovoltaic on-site.