三相电压型PWM整流器分数阶PID直接功率控制

Direct Power Control Based on Fractional-order PID Controller of Three-phase Voltage Source PWM Rectifier

研究了一种基于分数阶PID控制器的三相电压型PWM整流器直接功率控制方案,在瞬时功率理论的基础上设计了功率内环、直流电压外环的控制结构。由于基于整数阶PI控制器的抗扰性能差且对系统参数变化较敏感,在直接功率控制方法的直流侧电压控制环节引入分数阶PID控制器进行直流侧电压控制,根据系统功率模型采用分数阶控制器频域设计方法设计了分数阶PID控制器。仿真实验证明,分数阶PID控制方案优于PI控制方案,具有良好的动态性能和较强的鲁棒性,响应速度更快,控制结果更精确。

A control strategy of three-phase PWM rectifier based on direct power control was proposed which used fractional-order PID controller. Double control-loop was designed based on instantaneous power theory, and the inner-loop is powel control-loop, the external-loop is voltage control-loop. Fractional-order PID controller was used to control the DC voltage, because the integer-order PI controller has poor anti-interference performance and plays sensitive to the parameter- varying of the system. The fractional- order PID controller was designed by frequency domain design method under the power model of the system. The simulation results show that the fractional-order PID controller has good dynamic performance, robust performance, quick response, and accurate control results, better than PI controller.