Study On Reactive Power Optimization Of Distribution Network With Distributed Generation

Distributed power supply is widely used in power system because of its advantages of cleanness,environm entalprotection,low construction cost and flexible power generation.Distributed power supplies active power to the grid,and also provides a certain reactive power.But the distributed power supply also makes the distribution network structure and power flow more complex.This paper introduces several typical distributed generation power supply and grid model,according to the operation mode and control mechanism of different,divided into PQ,PI,PV,PQ(V)four node type.The two order cone model in power flow calculation is established,and then the power flow algorithm based on two order cone programming is given.Comparing the power flow calculation results of Newton method,forward backward iteration method and two order cone programming algorithm in the IEEE14 node and the IEEE33 node system.The accuracy and stability of the two order cone programming algorithm are verified.The DG of four node access types are connected into grid respectively,the reactive power compensation capability of different distributed power supply is analyzed.The rapidity and convergence of the proposed method are verified.Establishing the minimum network active power loss as the objective function of the distributed power distribution network reactive power optimization mathematical model.The basic particle swarm optimization algorithm has good rapidity and convergence,and is widely used,but it is easy to "premature"".It is widely used,but it is easy to "premature".To balance particle convergence and search capability,this paper introduces the fission theory on the basis of the particle swarm optimization algorithm with time-varying acceleration coefficients.The fast search ability of the improved PSO algorithm is combined with the global convergence of the two order cone algorithm to reduce the network loss and raise the node voltage level.The reactive power optimization of the distribution network with distributed generation is realized.The simulation experiments in the IEEE33 node system verify the effectiveness of the proposed algorithm,and get the effect of reactive power optimization in decentralized local compensation mode.