Research On Optimization Stratege Of Reactive Power Distribution In Wind Farm

Due to the strong randomness and intermittency of wind power,the large-scale grid-connection of wind power has had a certain impact on the voltage stability of the grid-connected point.Regulating reactive power can effectively maintain the stability of the wind farm voltage.For the economic and safe operation of wind farm,this paper mainly uses the reactive power adjustment capability of the wind farm to optimize the reactive power of the wind farm.Therefore,this paper will focus on the optimal distribution of reactive power in wind farm.The main research contents are as follows:(1)The grid-connected control of permanent magnet synchronous wind turbines is studied,and the voltage and current double closed-loop control strategy is adopted to realize the control of the DC bus voltage and reactive power of the wind turbines.A 2MW permanent magnet synchronous wind turbine grid-connected control simulation model was built based on Simulink,and the simulation research was carried out.(2)Research on the optimal distribution strategy of reactive power to minimize the line loss of wind farm.First,the transformer model and transmission line model of the wind farm are established,and the reactive power optimal distribution strategy of the wind farm with minimizing the line loss is proposed.The strategy takes the minimum line loss of the wind farm as the optimization objective,and the reactive power of each wind turbine is the optimization object.The voltage amplitude and phase of each nodeare calculated by the powerflow,and fnally the particle swarm optimization algorithm is used to optimize the reactive power distribution.Based on Matlab,a wind farm reactive power distribution simulation model composed of 25 5MW permanent magnet synchronous wind turbines was built,and a simulation study was carried out on the reactive power optimal distribution strategy.(3)Since the converter capacity of the permanent magnet synchronous wind power generation system is relatively large,the grid-side converter loss should be considered in the loss minimization reactive power distribution strategy.Based on this,the reactive power optimal distribution strategy of wind farm considering converter loss and line loss minimization is proposed.The particle swarm optimization algorithm is adopted,and the simulation model and simulation conditions are the same as the research content(2).