Separated wind measurement individual pitch control of wind turbine based on lidar

Based on the traditional PID controller of individual pitch control(IPC), an optimized control method is proposed by introducing the lidar. The lidar can be used to reconstruct the characteristics of the wind field information in front of the wind turbine, predict the wind speed and direction in front of the totor in advance, and the measured data can be processed by using the unified wind evolution model to obtain the wind speed in the center of the totor that is closer to the reality. Furthermore, the method of separated wind measurement(SWM) proposed in this paper is used to calculate the blade root load in advance, and the blade root load is controlled by IPC according to the calculated value of load. This method is used to solve the problem of mismatch between wind speed and pitch angle caused by signal delay and rotor actuator delay. The blade root load and hub unbalance load can be further reduced under the condition of ensuring stable power generation. The wind model is generated with TurbSim software and co-simulated with Matlab/Simulink and FAST. The simulation results show that the unbalanced load can be reduced by 8.07% to 11.17% under the rated wind condition, and the peak load can be reduced by 32.06% under the gust wind condition. © 2022, Solar Energy Periodical Office Co., Ltd. All right reserved.