Research On Reactive Power And Voltage Control Technology Of Wind Farm Based On Multi-Agent

With the emphasis on new energy development,wind power and construction of wind farms are receiving great attention and support to improve the utilization of wind power,making the installed capacity of wind turbines in wind farms is increasing.Due to the large randomness and high volatility of wind energy,when large-scale wind power is connected to the grid,there will be problems such as unstable voltage and reduced power quality in the grid.Meanwhile,because there are many transformer equipments and long transmission lines,the excessive loss of the collector system has a great challenge to the requirements of energy saving and economic benefits in the wind farm.Considering that the current mainstream doubly-fed wind turbines have reactive power regulation capability,a loss reduction optimization control strategy is designed to support the grid connection point demand by controlling the reactive power of wind turbines and reduce the active power loss of the collector system in the wind farm.At the same time,considering the reliability and compatibility of the centralized control mode of wind farm,a reactive power control system based on multi-agent technology is established by combining the distributed control system with the control of wind turbines.Based on the above ideas,a hybrid simulation platform is established,and the simulation test analysi is performed to verify the effectiveness of the loss reduction optimization control strategy and the feasibility of the multi-agent reactive power control system.Firstly,the model and control principle of the doubly-fed wind turbine is stated and its reactive power output characteristics and reactive power control methods is analyzed.Meanwhile,the loss of collector system in wind farms is stated.Then a wind farm reactive power control system based on multi-agent system(MAS)is proposed,and its organizational structure,agent functions and communication cooperation are designed.The loss reduction optimization control strategy is proposed,which is based on partial swarm optimization(PSO)algorithm to achieve the purpose of reducing the loss of collector system during the operation of the wind farm.Finally a hybrid multi-agent simulation platform based on Java/JADE+MySQL+Matlab/Simulink is developed,on which a wind farm is modeled and simulated,to reflects the feasibility of the designed reactive power control system.The simulation of various scenarios is carried out and results show that compared with the traditional proportional control strategy,the effectiveness of the proposed control strategy is improved.