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RISS 인기검색어
- 검색키워드
- 저자 : Zhiqin Mai (검색결과 4 건)
- 무료
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Mu Yalu,Liu Jilong,Mai Zhiqin,Xiao Fei,Li Shun 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.4
In a permanent magnet synchronous motor (PMSM) drive system without voltage sensor, aff ected by the inverter non-linearities, there is a phase off set problem between the reconstructed voltage and the actual voltage. This phase off set increases as the switching frequency decreases, especially pronounced in subway permanent magnet traction systems operating at the hundreds of Hertz level. As a result, in the medium-to high-speed range, the estimated rotor position progressively advances ahead of the actual rotor position, accompanied by an increasing content of estimated speed harmonics. To address this issue, this paper proposes a sensorless control performance optimization strategy for low switching frequency permanent magnet drive systems. On the one hand, the position error compensation strategy of voltage phase advance adjustment is adopted to eliminate the phase off set between the actual voltage and the reconstructed voltage. On the other hand, the method of cascading the adaptive notch fi lter with the low-pass fi lter is used to eliminate the harmonic interference in the feedback current, so as to realize the harmonic suppression of the estimated speed. The experimental results have confi rmed the eff ectiveness of the proposed optimization strategy, ultimately the position sensorless control of the PMSM drive system with the inverter switching frequency of 500 Hz was achieved, eff ectively optimizing the control performance at low switching frequencies.
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Yalu Mu,Jilong Liu,Zhiqin Mai,Xiao Fei,Kangzhuang Fu 전력전자학회 2024 JOURNAL OF POWER ELECTRONICS Vol.24 No.5
In the permanent magnet synchronous motor (PMSM) high-frequency (HF) rotating voltage injection method, a current demodulation process is usually used to improve the rotor position estimation accuracy. Current demodulation is usually realized by the synchronous frame high-pass filter (SFHF) algorithm. However, the current demodulation process is complicated, and the position estimation error changes with the rotation speed. To this end, an improved HF rotating voltage injection method based on the direct decoupling (DD) current demodulation algorithm is proposed. This method takes into account the comprehensive matching optimization of both the position error cancelation compensation and the current demodulation simplification. In addition, it completely solves the problems of insufficient position estimation accuracy and complex algorithm implementation. Finally, a three-phase PMSM is taken as the research object to verify the effectiveness of the proposed method.
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Optimization of maximum torque output in the wide speed range of a PMSM traction control system
Zhang, Weiwei,Xiao, Fei,Liu, Jilong,Mai, Zhiqin,Li, Chaoran The Korean Institute of Power Electronics 2020 JOURNAL OF POWER ELECTRONICS Vol.20 No.1
This paper introduces a permanent magnet synchronous motor maximum torque control method for the wide speed range of a traction control system. This method tracks the maximum torque per ampere operating point and generates a d-axis current command according to the injection of a high-frequency angle signal to the current. This method is parameter independent when looking for the maximum torque per ampere operating point. By not injecting any real signal to a permanent magnet synchronous motor, this method does not increase the amount of copper and iron losses resulting from real signal injection. To obtain a maximum torque output in a wide speed range, this method considers the maximum amplitude limits of voltage and current when the traction motor runs in a flux weakening control field. This method is also robust to current and voltage harmonics, speed mutations, and torque disturbances. Experiment and analysis are conducted on a permanent magnet synchronous motor traction control system prototype under various operating conditions to verify the effectiveness of this method.
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Weiwei Zhang,Fei Xiao,Jilong Liu,Zhiqin Mai,Chaoran Li 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.4
Rail transportation interior permanent magnet synchronous motor traction control system (IPMSM TCS) requires high torque output capability. Traditional algorithms used to fnd the maximum torque per ampere (MTPA) operating point in TCS have strong dependence on motor parameters. Because the algorithm is less robust to motor parameters, there will be deviation between the MTPA operating point and the actual value when the parameters change, so that it is difcult to guarantee the torque output capability of the traction system under diferent working conditions. This paper introduces a current angle signal injection control method (CASIM) to solve this problem. The proposed method tracks the MTPA operating point and generates d-axis current command according injecting an angle signal to current and making the partial derivative of torque to current angle equal to zero. At the same time, less motor parameters are needed to calculate the torque in this method. Consequently, in the process of looking for MTPA operating point, the accuracy is less afected by the variation of motor parameters. And also it does not inject any real signal to IPMSM, so that it does not increase copper and iron losses. Moreover, it is robust to speed mutation and torque disturbances. The efectiveness of CASIM proposed in this paper is proved by simulation and experiment results on an IPMSM TCS platform.
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