A Two-Degree-of-Freedom Current Loop Parameter Tuning Method Based on Bandwidth and Phase Margin

Abstract

The traditional current loop tuning method is usually completed based on pole-zero cancellation (PZC) in permanent magnet synchronous motor (PMSM) system. However, it is difficult to take both bandwidth and margin optimization into consideration. In view of the limitation of PZC method, this paper proposes a two-degree-of-freedom current loop tuning method based on bandwidth and phase margin(PM). The design criterion of proposed self-tuning algorithm is making the two indexes meet the preset value and maximizing the gain margin(GM) at the same time. The effectiveness of the proposed scheme are verified by simulation experimental comparison.