Dual Quasi-Resonant Controller Position Observer Based on High Frequency Pulse Voltage Injection Method

• Main Authors: Yi Mao, Yi Du, Zhuofan He, Li Quan, Xiaoyong Zhu, Li Zhang, Yuefei Zuo
• Format: Article
• Language: English
• Published: IEEE 2020-01-01
• Series: IEEE Access
• Subjects: Dynamic performance improvement; position error fluctuation reduction; pulsating high frequency voltage injection method; quasi-resonant controller; sensorless control
• Online Access: https://ieeexplore.ieee.org/document/9265185/

This paper proposed a dual quasi-resonant controller position observer for conventional pulsating high frequency voltage injection method. The proposed position observer can not only improve the dynamic performance of the sensorless control, but can also compensate the position error fluctuation caused by the dead-time effect. To improve the dynamic performance, the digital bandpass filter in the traditional position observer used to extract high frequency current response is replaced by a quasi-resonant controller firstly. Moreover, an improved Luenberger observer without lowpass filter, which is usually used in traditional position observer to filter the noise in speed information, is adopted in the new position observer. Therefore, dynamic performances can be improved. Then, to reduce the sixth harmonic in the magnitude of position error and speed error caused by the dead-time effect, a frequency adaptive quasi-resonant controller is connected in parallel with the proportional-integral controller in the Luenberger observer. The experiment results verify that the proposed observer can reduce the position estimation error not only in steady state operation conditions, but in variable speed and variable load conditions, and the speed variation range can be widened as well.