Research On Reactive Power Optimal Control Strategy Considering Loss Of Wind Farm

New energy generation has become the mainstream power generation,and wind power generation is one of them.Based on this,it is very necessary to study reactive power control technology in combination with the development trend of wind turbine interconnection,in order to improve the capacity of wind farms to accept the grid at the same time,to achieve safe and economic operation.First of all,the current domestic and foreign research status and background on wind power energy is given.And the mathematical model of each part of wind farm are established and analyzed.Then,a distributed reactive power optimization control scheme based on the uniform alternating multiplier direction method is came up with,which transforms the total loss optimization of wind farm into the distributed optimal power flow problem considering the optimal operation of doubly fed wind farms.In this scheme,the distributed control method is used.Under the condition of relatively sufficient reactive power,it can optimize the reactive power more economically and adjust reactive power without the need to depend on compensation device more flexibly and reduce the wind field loss.The large global problems are decomposed into several small local sub problems which are easy to solve by using the method of uniform alternating multiplication sub direction.The solutions of large global problems are obtained by solving the coordination subproblems.At last,a reactive power optimization control strategy which considering the reactive power compensation output distribution is proposed.When system’reactive power is low,the reactive power demand is taken as the starting point of the study.According to the difference between the dynamic continuous reactive power compensation device with adjustable capacity and the fixed reactive power compensation device and the reactive power demand,as well as a certain margin reactive power distribution compensation device and a doubly-fed fan are combined.Based on the network loss of wind farm system,the wind turbine and its output are calculated by using the loss sensitivity algorithm(genetic algorithm),and the reactive power is distributed to the inner converter and the stator of a single typhoon generator.These are helpful for the wind turbine to give full play to the reactive power output capacity and reduce the loss.In this paper,PSD-BPA software is used to simulate a wind farm.The relevant parameters of the wind farm and the layout of the wind farm,the method of calculating reactive power allocation and the results are described.A simulation experiment is taken for the distributed reactive power optimization control strategy which based on continuous alternating multiplier direction method.The simulation results show that the strategy is efficient to reduce the reactive power loss of wind farms in lots of scenes.Then,the reactive power optimization control strategy with reactive power compensation output distribution is simulated and analyzed under the capacitive demand and inductive demand of the system and the wind farm loss are analyzed,and simulation results are compared to the different methods.Finally,the conclusion proves the justifiability of the control strategy.