ABSTRACT
The control core of the doubly fed wind generation system is the dual PWM converter. Traditionally, the control method is used with the Proportional Integral (PI) controller. With the increase of wind turbine installed capacity, the system requirements for control precision and stability are higher. It is difficult to ensure that the PI control method can meet with control requirements in the case of an unbalanced power system. This paper adopts the method of Proportional Resonant (PR). The PR controller makes sure that the system’s output is without static error. This method can also guarantee active power and reactive power of rotor side decoupling control at the same time, eliminating the coupling and feed-forward compensation to reduce the times of coordinate changes. This can reduce the influence of grid frequency deviation of the converter output inductor current, thus effectively improving the precision of the control algorithm and the electric energy’s quality. The feasibility and correctness of the theory are verified by simulation experiment and result analysis.
