Optimization Design of Controller for Pitch Wind Turbine

Due to the randomness of wind speed and the nonlinearity of control system for wind power generating units it is hard to achieve accurate mathematical model of wind power generating units. Since the simple proportional integral differential(PID) controller or proportional integral(PI) controller are generally applied in actual wind power generation projects to achieve the control objective to output constant power and it does not come down to complex intelligent control algorithm, in the occasion that the wind speed is higher than rated wind speed an additive decomposition based method is proposed to normalize the design parameter of variable pitch controller for wind power generating units, that is, the variable pitch control problem of wind power generating unit is decomposed into two simple subproblems, namely the tracing of linear time-invariant main system and the stabilization of auxiliary system. Based on the proposed principle, a simple PI controller is designed, and the optimization design of the controller is carried out, and then the stability of this controller is proved by theoretical derivation. Finally, the fact that using the optimized controller the stationary of the output power can be greatly enhanced is validated by simulation results.