Shift-MRF Based Current Harmonics Compensation Decoupling Strategy in PMSM Considering Sampling Delay and Parameter Mismatch

This article investigates the coupling problem of current harmonics compensation in multiple reference frame (MRF) for permanent magnet synchronous motor (PMSM). A novel decoupling framework, based on shift-MRF that incorporates a specific decoupling angle, is established, which can cover existing harmonic decoupling methods and directly evaluate coupling degree. Additionally, the impact of sampling delay and parameter mismatch on the decoupling angle are analyzed. To eliminate this interference, an automatic search strategy is proposed, which identifies the optimal decoupling angle at various speeds. Compared with existing decoupling approaches, it simplifies the decoupling framework, reduces computational complexity, and achieves better decoupling performance. Experimental results are presented to validate the effectiveness and superiority of the proposed algorithm.