Research On Multi-objective Optimization And Reconfiguration Of Distribution Network With Photovoltaic

In recent years,with the maturity of photovoltaic power generation technology,a large number of distributed photovoltaics have been incorporated into the power distribution network.On the one hand,the ability of the grid to respond to loads has been improved.Certain impact.At the same time,in the daily operation of the distribution network,in order to cope with certain situations,the network is restructured through switching actions to ensure the economical and stability of the power grid.The access to photovoltaics will also make the distribution network restructure more The complexity makes it difficult for the traditional network reconstruction scheme to meet the operation control requirements of the power grid under complex network structures.In this regard,this paper conducts research on multi-objective optimization reconstruction of distributed photovoltaic distribution networks.The main research contents include:(1)Analysis of photovoltaic grid connection.First,analyze the photovoltaic power generation principle and grid connection method.According to the characteristics of different types of photovoltaics during grid operation,classify the node types to ensure the accuracy of power flow calculation.Finally,analyze the photovoltaics.The impact of access on the power grid lays the foundation for the following research;(2)Considering the randomness of photovoltaics and the fluctuation of load on the distribution network,first establish a probabilistic fluctuation model of the two.Based on this,a method for calculating stochastic power flows based on the probability distribution is proposed.Based on the improved semi-invariant Realize power flow calculation with photovoltaic distribution network,and study and analyze the network reconstruction optimization model of photovoltaic grid-connected distribution network;(3)Investigate the static network reconstruction strategy with photovoltaic distribution network.Considering the impact of photovoltaic grid connection,construct a comprehensive economic and reliability analysis with the minimum network loss,the smallest load balancing rate,and the lowest total operating cost.Reconstruction model of the target network,and then build an ant colony algorithm based on elite search and fuzzy pheromone improvement to realize distribution network reconstruction,The scheme was robustly analyzed by simulating in the IEEE33 node system and the actual power grid;(4)Study the dynamic network reconstruction strategy with photovoltaic distribution network,build a dynamic reconstruction model that takes into account economics,reliability,and safety,and use analytic hierarchy and multi-agent systems to establish stochastic photovoltaic and fluctuating loads The dynamic optimization and reconfiguration strategy of the active distribution network realizes the dynamic cooperative reconstruction of the active distribution network,and improves the self-healing ability and load power supply reliability of the active distribution network.