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永磁同步电机的抗扰动能力较差,电流环容易受到系统扰动的影响而产生振荡.为了提高永磁同步电机电流环的抗扰动能力,该文提出了一种基于虚拟阻抗的电流环振荡抑制策略,考虑了系统延时对所提出的控制策略的影响,并使用Pade近似方法研究了降低延时影响的补偿方法及系统的稳定边界条件.在考虑电压源型逆变器的开关效应的情况下进一步探讨了虚拟阻抗电流环参数的设计方法,分析了电机参数误差对控制系统动态性能和虚拟阻抗参数选择的影响.通过对基于虚拟阻抗电流环的跟踪能力和抗扰动能力两方面的实验研究,验证了所提出方法的有效性.“,”Due to poor disturbance rejection of the permanent magnet synchronous machine (PMSM),the dynamic performance of the current loop suffers from electromagnetic oscillations caused by system disturbance.In order to improve the disturbance rejection of the current loop,a new current control strategy for the PMSM based on virtual impedance was proposed.Effects of the time delay on the proposed virtual impedance method were analyzed and compensated using Pade approximation.The stability boundary of the current loop with virtual impedance was derived.The gain selection of the virtual impedance was further discussed by considering the switching effects of the voltage source inverter.Effects of machine parameter errors on the current dynamics and the gain selection of the virtual impedance were also discussed.Both the command tracking and the disturbance rejection of the proposed strategy were tested on the laboratory platform.Experimental results validate the effectiveness of the proposed strategy.