Qinghao Wang
ABSTRACT
In this paper, a new method combining high frequency injection in stationary reference system and state estimation PLL (SEPLL) is proposed for the startup and low-speed operation of permanent magnet synchronous motor (PMSM). The high-frequency rectangular signal is injected into the stationary reference frame, and the high-frequency response current of the response is decomposed into the sum of sinusoidal signals by Fourier decomposition, and the response current containing the position information of the rotor is obtained by signal modulation, which reduces the influence of inductance variation on the system. Then, the rotor position is estimated by using SEPLL. Compared with traditional phase locked loop algorithm, this algorithm has stronger robustness to noise, better estimation accuracy and higher response speed even under very high noise. The performance of the method is evaluated by simulation. The results show that the method is less affected by noise and can accurately estimate the rotor position at low speed, with good stability and dynamic performance.
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