An Electromechanical Coupling Resonance Suppression Method for IPMSM Drive System Considering the Fluctuation of DC‐Link Voltage

ABSTRACT With the consideration of the DC‐link voltage fluctuation, the motor output torque contains a large number of fluctuating components, which may trigger electromechanical coupling resonance (EMCR) and deteriorate the system control performance. In order to solve this problem, the model of the electromechanical coupled system is established, and the mechanism of EMCR generation is analysed. On this basis, a method to suppress EMCR by destroying the EMCR generation conditions is proposed. The method is implemented by stator voltage harmonic compensation and speed harmonic feedback. In addition, the control performance of the system with the proposed suppression method is analysed under different conditions. Finally, extensive tests are performed to verify the effectiveness of the proposed method.