Abstract：High frequency (HF) rotating voltage injection method is widely used to estimate the rotor position in zero- and low-speed zone for permanent magnet synchronous motor (PMSM), where synchronous frame high-pass filter (SFHF) algorithm is employed for current demodulation. However, the disadvantage of the SFHF algorithm is that not only the current demodulation process is complicated, but also the position error changes with speed. To this end, a current demodulation algorithm based on the estimated position feedback (EPF) is proposed. On one hand, the efficient position error compensation strategy is designed with the EPF algorithm, which helps to eliminate the influence of speed on the accuracy of position estimation. On the other hand, a notch filter (NF) is employed in the position loop to eliminate the harmonic components, which expands the closed-loop bandwidth of the position loop effectively. Thus, the dynamic performance of position estimation is improved under fast acceleration and deceleration conditions. In this paper, the implementation of the traditional HF rotating voltage injection method is reviewed. Then, the EPF current demodulation algorithm and the position estimation error compensation strategy are introduced in detail. Moreover, the principle to expand the position loop bandwidth with NF is analyzed. Finally, the feasibility of the proposed strategy is verified through an PMSM experimental platform.
麦志勤, 刘计龙, 肖飞, 李科峰, 郑云波. 基于估计位置反馈电流解调算法的改进型高频旋转电压注入无位置传感器控制策略[J]. 电工技术学报, 2022, 37(4): 870-881.
Mai Zhiqin, Liu Jilong, Xiao Fei, Li Kefeng, Zheng Yunbo. Sensorless Control Strategy of Improved HF Rotating Voltage Injection Based on Estimated Position Feedback Current Demodulation Algorithm. Transactions of China Electrotechnical Society, 2022, 37(4): 870-881.
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