Research On Comprehensive Optimization Based On Network Reconfiguration And Capacitor Control In Distribution System

The distribution network is designed in closed loop and operated in open loop. Network reconfiguration and capacitor control are two useful measures to the economic operation. Network reconfiguration is to optimize the network topology and to reach the purposes of the reduce network losses and the load balance by optimizing the running status of the switches to adjust the distribution of the load flow. Capacitor by compensating reactive power on bus can reduce the reactive power flow in the network to keep the local balance of reactive power load and reach the purposes of reduced network losses and improved the voltage quality. This paper combines network reconfiguration and capacitor control to optimize distribution network, which can find the potential of the distribution network and improve economical efficiency and the voltage quality.Firstly, This paper analysis and study the theory and the trait of simulated annealing (SA) and particle swarm optimization (PSO) and present the simulated annealing-particle swarm optimization. This algorithm combines global optimization of SA and calculating speed of PSO to avoid long time calculating and falling into local optimal solution. It can get the global optimal solution by using the group intelligent of PSO and the SA’s ability of breaking out local optimal solution.Secondly, considering the trait of distribution network topology and the characteristic of distribution reconfiguration, the result of distribution reconfiguration must be in open loop. Through analysis and simplification of distribution network topology, breaking loop can get a correct result of distribution reconfiguration to reach the constraint condition. In the optimization process because the frequent change of the switching state which make the distribution network topology changing, this paper use the backward/forward which can identify the distribution network topology.Finally, this paper analyzes and presents the mathematical model and constraint condition of distribution network reconfiguration, capacitor control and comprehensive optimization. This paper compares the result of loss reduction and voltage quality with distribution network reconfiguration, capacitor control and comprehensive optimization, and the example proves the correctness and advantage of the algorithm.