Pitch-control for wind turbine generator based on Action Dependent Heuristic Dynamic Programming

Pitch-control is a main method to maintain the output power stable when wind speed above the rated in Large and medium-sized variable pitch wind turbine generator. Because wind turbine generator is a complex nonlinear system of multi-interference and strong coupling, traditional pitch controller can not satisfactorily solve the problems of low convergence speed and large steady-state error. A new type of pitch optimization control method based on Action Dependent Heuristic Dynamic Programming method is provided in this paper, at the same time the principle of the algorithm and design steps of the controller are introduced, then the simulation experiments with a 1.5MW wind turbine generator and compared with the traditional PID control method are given. Simulation results show that output power can maintain the rated when wind speed above rated with the new pitch control strategy. It can effectively reduce system´s overshoot and setting time, and has a satisfactory performance.