基于频率自适应复矢量PI控制器的PMSM电流谐波抑制策略

Frequency Adaptive Complex Vector PI Controller Based Current Harmonics Suppression of PMSM Drives

逆变器非线性和电机反电动势谐波给永磁同步电机(PMSM)系统引入了电流谐波,在对其特性分析的基础上,将复矢量PI控制器用于电流谐波的抑制。在磁场定向矢量控制的d、q轴电流环中,将若干复矢量PI控制器与原有PI控制器并联,其中心频率随着电机转速自适应调节,PI控制器调节d、q轴中的直流分量,通过复矢量PI控制器在中心频率处的高增益无静差跟踪控制d、q轴中不同频率的交流量,从而达到抑制电流谐波的目的。仿真和试验结果表明,复矢量PI控制器对电流的5、7等频次的谐波具有良好的抑制效果。

Current harmonics are induced into permanent magnet synchronous motor(PMSM) drive systems because of the inverter nonlinearity and back electromagnetic force(EMF) harmonics. Based on analysis of current harmonic characteristic, the complex vector PI(CVPI) controller is used to suppress current harmonics. In the d-and q-axis current loops of the field-oriented vector control system, multiple CVPI controllers whose central frequencies vary with the motor speed are employed in paralleled with original PI controllers. The PI controllers are used to adjust d-and q-axis direct current components, and the alternating current components are tracked and controlled by means of the large gains of the CVPI controller at the central frequencies. Consequently, the current harmonics are suppressed. The simulation and experimental results show that the CVPI controller has good suppression performance for current harmonics such as 5 th and 7 th, etc.