Abstract：The self-adjusting frame amplitude convergence (SFAC) algorithm applied to the rotating high-frequency (HF) voltage injection method is simple and practical, and achieves high-precision identification of the initial rotor position of permanent magnet synchronous motor (PMSM) under standstill conditions. However, it is found that the SFAC algorithm is not suitable for non-zero speed zone because the position estimation error changes with the speed. To this end, an improved SFAC (ISFAC) current demodulation algorithm is proposed. In ISFAC algorithm, the HF current is demodulated in the estimated $\hat{d}\hat{q}$-frame to construct the rotor position error signal. Utilizing the current phase delay characteristics of positive and negative HF current that are equal in magnitude and opposite in direction, the phase delay is eliminated automatically. The improved algorithm not only eliminates the complicated position error compensation strategy, but also extends the speed applicable range of the traditional SFAC algorithm from zero speed zone to non-zero speed zone. The mechanism of SFAC algorithm and the reasons leading to position estimation error in the non-zero speed zone are analyzed. Moreover, the implementation of ISFAC algorithm is introduced. The position estimation performance of traditional SFAC and ISFAC algorithm is compared and verified on a RT-Lab platform.
麦志勤, 肖飞, 刘计龙, 张伟伟, 连传强. 基于改进型自调整轴系幅值收敛电流解调算法的旋转高频电压注入法[J]. 电工技术学报, 2021, 36(10): 2049-2060.
Mai Zhiqin, Xiao Fei, Liu Jilong, Zhang Weiwei, Lian Chuanqiang. Rotating High-Frequency Voltage Injection Method Based on Improved Self-Adjusting Frame Amplitude Convergence Current Demodulation Algorithm. Transactions of China Electrotechnical Society, 2021, 36(10): 2049-2060.
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2021, Vol. 36 
