An Improved High-Frequency Signal Injection Sensorless Control Based on Luenberger Observer for Permanent Magnet Synchronous Motor Drives

Abstract

An improved high-frequency pulsed sinusoidal voltage signal injection (HFPS-VSI) sensorless vector control strategy applied to interior permanent magnet synchronous motor (IPMSM) is proposed in this paper. The Luenberger observer is utilized to extract the fundamental current without any low pass filter (LPF). Hence, it can enhance the system bandwidth. Moreover, the novel primary current extraction method has no magnitude error and phase delay, presenting strong parameter robustness at the fundamental frequency. In the feedback gain matrix design, the left-shifting design method of the observer pole is adopted in this paper, which makes the Luenberger observer keep a strong anti-interference in the full-speed region. The effectiveness of the novel HFPS-VSI algorithm is verified on a two-level IPMSM platform by simulation and experimental tests compared to the conventional HFPS-VSI sensorless control strategy. These results reveal that the novel HFPS-VSI algorithm has a better steady-state and dynamic performance than the traditional HFPS-VSI method.