The Research On Reactive Power Optimization Of Distribution Network Considering DG

It inevitably makes a difference on distribution network that more and more DGs switch in the distribution network.As the important research aspect of the safe and stable operation of power grid,the reactive power optimization should be different from traditional method.The voltage stability and the change of network loss with the DG interconnected into the system should be considered to make sure efficiency and reliability of the system operation.Making the reactive power optimization of distribution network containing DG as the main object of study,this paper builds a reactive power optimization model of the distribution network with DG based on the voltage stability.In order to reduce the system network loss and improve system voltage stability,the MAPSO algorithm is used to make optimization.The simulation results verify that the model and the improved algorithm can improve the optimization effect,which possesses feasibility and applicability.The following items are mainly to be done:(1)Build the distributed power generation models contain the fluctuation characteristics of solar and wind energy,study the influence of different DG access mode into power grid.(2)On the basis of giving the analytical method of voltage stability,the impact of DG interconnection on voltage stability is discussed.By the simulation of IEEE33 node system and 18 chain node system,the method of determining the location and capacity of distributed power grid which considers the voltage stability and system network loss has been studied,,thus providing theoretical basis for later study of reactive power optimization.(3)In view of the defects in PSO that the algorithm's convergence precision and convergence speed still have some room for improvement and it's easy to fall into some local optimal solution,multi-agent has been introduced to make some improvement.It's also finished in this paper that analyze the structure of the multi-agent PSO and its application in reactive power optimization containing DG distribution network.(4)The distribution network reactive power optimization mathematical model considered the different output ways of DG is established to improve the precision of optimization further by adjusting the active output of DG.The simulation analysis of the MAPSO algorithm on the IEEE33 node system has been made.After making comparisons with the results of the traditional PSO algorithm,we can figure that the MAPSO algorithm has better convergence and convergence precision,demonstrating that the proposed method in this paper possessing superiority and feasibility.