Abstract Due to the overlap effect of the current source inverter and the large current pulsation of the bus controlled by the front DC-DC, the extended back electromotive force contains a large number of harmonics, producing large position errors, which in turn affect the performance of the system. Therefore, this paper proposes a sensorless control method of the permanent magnet synchronous motor driven by the current source inverter with an improved sliding mode observer. The proposed method can reduce the harmonic distortion of the estimated back electromotive force caused by the overlapping current effect and the large busbar current pulsation, thereby reducing the position error and speed pulsation, which has good dynamic performance. Firstly, based on the traditional sliding mode observer, the voltage model of the permanent magnet synchronous motor is established under the α-β stationary coordinate system, and the observer is constructed according to the voltage model. The chattering of the system is reduced using the saturation function instead of the sign function in the ideal sliding mode. Since the traditional sliding mode observer uses a first-order low-pass filter to filter the observed back electromotive force, the problems of phase lag and amplitude attenuation will be caused, and there are still excessive high-frequency chattering components in the observed back electromotive force. Therefore, a complex coefficient filter without phase delay and amplitude attenuation at the center frequency is designed to replace the traditional low-pass filter. The estimated back potential can be accurately extracted, and the phase lag and amplitude attenuation problems can be avoided while chattering is suppressed. At the same time, the velocity information estimated by the phase-locked loop is fed back to the coefficient filter to realize the adaptability of the complex coefficient filter. Secondly, the complex coefficient filter can filter out part of the 5th and 7th harmonics in the observed back electromotive force, forming the 6th position error signal to affect the position observation accuracy. Thus, the second-order generalized integrator is embedded in the phase-locked loop, and the notch property is used to eliminate the sixth harmonics in the position error signal to further improve the position observation accuracy. At the same time, the reference speed is introduced into the phase-locked loop to improve the convergence speed of the phase-locked loop and the dynamic performance of the system. Finally, the experimental results show that compared with the traditional sliding mode observer, the estimated back electromotive force harmonic distortion is reduced from 8.9% to 4.12%, and the stator current harmonic distortion is reduced from 8.25% to 6.87%. The rotor position error is reduced by 25%, and the rotational speed error by 30%. The results show that the proposed method can better reduce the harmonic disturbance in the estimated back electromotive force, reduce the speed pulsation and position error, improve the estimation accuracy, and have good dynamic performance.
Zhao Wengxiang,Song Shichang,Zhou Shuwen等. Sensorless Control of Current Source Inverter Driven PMSM with Improved Sliding Mode Observer[J]. Transactions of China Electrotechnical Society, 2024, 39(4): 987-995.
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2024, Vol. 39 
