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中文摘要：
针对dq坐标下的PI控制很难消除稳态误差的问题,设计了一种使用于永磁直驱风电机组的改进PR控制。PR控制器由比例调节器P和谐振调节器R组成,网侧变换器采用改进的PR控制,能够实现无静差跟踪指令电流且不需要复杂的旋转坐标变换和前馈解耦控制,易于实现对并网逆变器电流中的低次谐波补偿和有功、无功功率的解耦控制。仿真结果验证了该控制策略的正确性和可行性,风机在电网发生短时严重的三相短路故障以及单相短路故障时能不切机运行。采用改进的PR控制提高了永磁直驱风电发电机组的动态响应能力及运行稳定性。
英文摘要：
It is difficult to eliminate steady-state errors by use of the traditional PI controller based on the synchronous dq frame;therefore,the improved PR control strategy is designed for the direct-driven permanent magnet wind turbines.PR controller is composed of a proportional regulator P and a resonant regulator R.Applied to grid-side converter,the improved PR controller can lead to instructed current with zero steady-state error,in no need of the complex rotating frame transformation and the feedback voltage,making it easy to achieve low harmonic compensation and active/reactive power decoupling control.The simulation results verify the validity and feasibility of the control strategy.Besides,when the three-phase or single-phase short circuit faults occur in the grid,the synchronous generator will continue to run.The improved PR control can improve the dynamic responsiveness and running stability of direct-driven permanent magnet wind turbines.
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