The application of several nonlinear control methods in doubly fed wind power operation control

In view of the problem that there is strong dependence on the motor parameters and poor motor dynamic decoupling for traditional PI controller adopted in doubly fed wind power system, several nonlinear control methods have been proposed in this work. The design method, advantages and disadvantages of these three kinds of nonlinear controller (the feedback linearization controller, integral sliding mode variable controller and ADRC controller) have been introduced in this paper, respectively. Then, we apply these three kinds of nonlinear controller to DFIG wind power control system and establish the system performance under PSCAD simulation environment. The simulation results show that the above three kinds of nonlinear controller can not only realize power decoupling of doubly fed wind power generation system, but also solve the problem that the traditional control has a strong dependence on the motor parameters simultaneously. Comparing the control performance of these three kinds of nonlinear controller, it can be found that the ADRC control system based on ADRC control is superior to the other two kinds of controller in decoupling effect and global robustness.