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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。
Aiming at the problem that the PI control in dq coordinates is difficult to eliminate the steady-state error, an improved PR control is designed for permanent magnet direct-drive wind turbines. The PR controller consists of a proportional regulator, P, and a resonant regulator, R, and the grid-side converter, with improved PR control, enables no dead-slip tracking command current and does not require complicated rotary coordinate transformation and feedforward decoupling control and is easy to implement Low-order harmonic compensation and active and reactive power decoupling control in grid-connected inverter. The simulation results verify the correctness and feasibility of the control strategy. The fans can not shut down when there is a serious three-phase short-circuit fault and a single-phase short fault in the power grid. Adopting improved PR control to improve the dynamic response capability and operating stability of permanent magnet direct-drive wind turbine.