volume | PIER Journals

Abstract

This paper presents an improved equivalent-input-disturbance (IEID) method based on enhanced estimators. This method addresses the degradation performance in a permanent magnet synchronous motor (PMSM) drive system caused by multi-source disturbances in different frequency bands. First, a PMSM model is established that considers these disturbances and categorizes them as control inputs for both current and speed-loops. Next, the estimated compensation structures of the dual-loop equivalent-input-disturbance (EID) are designed. To address the differing sensitivities of the dual-loop anti-disturbance frequency bands, enhanced estimators are designed to expand their respective bandwidths. This reduces the sensitivity of the system to uncertainty, and parameter-adjusting conditions are derived to ensure stability. Finally, the simulation results demonstrate that, when PMSM operates under the nominal condition, the IEID method suppresses steady-state speed fluctuation by approximately 63% compared to the method without EID compensation, by approximately 35% compared to the conventional EID method, and by approximately 25% compared to improved sliding mode observer-based EID (ISMO-EID) method; when PMSM parameters are perturbed, the suppression rates can further reach to 65%, 44%, and 32%, respectively. The findings indicate that the proposed method exhibits superior steady-state tracking accuracy and disturbance suppression performance, while also exhibiting enhanced robustness in transient scenarios.

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Dr. Jiacheng Tong

Professor Kaihui Zhao

Dr. Yunzhen Chen

Dr. Jinnan Cao

Dr. Youzhuo Duan

Professor Jie Xiong