Research On Reactive Power Optimization With Wind Power Connection Based On PSO

Since the optimization of the energy structure and the promoting of the green transformation,the proportion of new energy power generation increased rapidly.The grid connection of the new energy resources generation will affect the quality of the power supply and safety and stability of the operation,and a reasonable distribution of reactive power is an important prerequisite to improve the voltage quality and reduce the network loss.Therefore,it has great significance to solve optimization problems of the reactive power,in order to deal with the practical problems such as planning and designing of power grid,ensuring the economic and reliability of the network.Basing on the definition and present situation of new energy resources,this paper firstly introduces the effect brought by the grid-connection of the new energy on the power flow of the power grid,including the total loss of the system and the node voltage.This paper introduces different types of the renewable energy generation and their equivalent models,and also establishes the stochastic characteristic models for the wind turbine generators and the photovoltaic power generation,respectively.According to these model,this paper also calculates the power flow of the distribution network which is connected with new resources,and the improved Newton-Raphson method combined with the back / forward sweep is mentioned.Then it is used to calculate the power flow on IEEE30-bus system,the simulation results demonstrate the influence of the real power loss and voltage level.Taking these effect into account,this paper introduces the researches of the optimization algorithm and their advantages and disadvantages,respectively.Besides,it emphasis on expounding the theory of the basic particle swarm algorithm,and describes the optimization steps of the particle swarm optimization algorithm.Finally,a reactive power optimization mathematical model with new energy resources is built up,and the real power loss and node voltage deviation is taken into the consideration in the objective function,at the same time,the constraints of power flow,control variables and dependent variable are also established.Application of particle swarm algorithm for optimal reactive power is simulated on IEEE9-bus system,IEEE30-bus system,IEEE39-bus system and IEEE57-bus system,and simulation results are analyzed.It is proved that the reactive rational allocation of the distribution grid connected with new energy sources not only can improve the voltage quality,but also reduce the network loss effectively.