An Improved Deadbeat Direct Torque and Flux Control Strategy of Five-Phase Permanent Magnet Synchronous Motor

被引：0
|
作者：
Liu G. [1 ]
Sun W. [1 ]
Zhou H. [1 ]
Liu Z. [1 ]
机构：
[1] School of Electrical and Information Engineering, Jiangsu University, Zhenjiang
来源：
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | 2023年 / 38卷 / 24期
关键词：
Deadbeat control; delay compensation; direct torque and flux control (DTFC); permanent magnet synchronous motor (PMSM); space vector pulse width modulation (SVPWM);
D O I：
10.19595/j.cnki.1000-6753.tces.221730
中图分类号：
学科分类号：
摘要：
With the advantages of higher bus voltage utilization and more degrees of control freedom, multiphase permanent magnet synchronous motors (PMSMs) are widely used in electric vehicles, ship propulsion, and other fields. Direct torque control (DTC) and vector control (VC) are the most popular methods. Compared with VC, DTC needs two hysteresis comparators of stator flux linkage and torque and a switching table, which has a simple structure and fast dynamic response. However, traditional DTC has the disadvantages of large torque, flux linkage ripples, and high current harmonics. Model predictive torque control (MPTC) selects the optimal voltage vector from a control set according to the cost function to improve the torque and flux dynamic response. It has heavy computational burden and difficulty in tuning the weighting factor. Deadbeat direct torque and flux control (DB-DTFC) can eliminate the errors of torque and flux linkage within one sampling period by a voltage vector, which is obtained by discretizing the mathematical model. In addition, its control structure is simple, and it is unnecessary to adjust redundant parameters. However, there is a coupled relationship between torque and stator flux linkage. The traditional DB-DTFC has poor dynamic and steady-state performance. Therefore, an improved DB-DTFC strategy is proposed for five-phase PMSM. Firstly, the PMSM model is discretized in the two-stationary frame, and a voltage vector is obtained from the relationship among stator voltage, torque, and stator flux linkage. Thus, the decoupling control of torque and stator flux linkage can be achieved. Secondly, current and flux linkage observers are built to compensate for delay and parameter disturbance in the digital control system. Finally, due to harmonic space in the five-phase PMSM, the space vector pulse width modulation (SVPWM) based on four non-zero vectors is designed to restrain the third harmonic current. Experimental results of the traditional and improved DB-DTFC were tested at rated speed to evaluate the steady-state performance. Compared with the traditional DB-DTFC, the improved DB-DTFC can better suppress the torque and flux linkage ripples, the waveform of phase current is more sinusoidal, and the CPU execution time is shorter. Therefore, the voltage vector obtained by the improved DB-DTFC is more consistent with the deadbeat control goal, improving the stator flux and torque control accuracy and restraining current harmonics. Moreover, during dynamic experiments, the improved DB-DTFC has faster torque and speed responses, shorter adjustment time, and more dynamic response than the traditional DB-DTFC, ensuring the control accuracy of flux linkage. The effectiveness of the proposed strategy is verified through theoretical analysis and experiments, and the following conclusions can be drawn. (1) Compared with the traditional DB-DTFC, the stator voltage of the method is much easier to obtain, thus requiring less computation. (2) The model of torque and flux linkage is accurate to achieve the decoupling control. The ripples are less at steady-state operation, thus improving the steady-state and dynamic performance. (3) Current and flux linkage observers are designed to eliminate the delay of digital control and to improve the parameter robustness. (4) SVPWM based on four non-zero vectors can effectively restrain the third harmonic current and reduce the distortion of phase current. © 2023 Chinese Machine Press. All rights reserved.
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页码：6646 / 6657
页数：11
相关论文
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  • [1] Zhou Huawei, Xu Jinhui, Chen Cheng, Et al., Disturbance-observer-based direct torque control of five-phase permanent magnet motor under open-circuit and short-circuit faults, IEEE Transactions on Industrial Electronics, 68, 12, pp. 11907-11917, (2021)
  • [2] Wang Zhenyu, Sun Wei, Jiang Dong, Induction motor speed sensorless vector control system based on closed-loop flux observer with virtual voltage injection, Transactions of China Electrotechnical Society, 37, 2, pp. 332-343, (2022)
  • [3] Li Xiudong, Zheng Xiaoqin, Wang Haifeng, Et al., Copper consumption optimization strategy of nine-phase permanent magnet synchronous motor under fault-tolerant operation in the maximum torque range, Transactions of China Electrotechnical Society, 37, 17, pp. 4355-4363, (2022)
  • [4] Gao Hongwei, Yang Guijie, Liu Jian, A vector control strategy for five-phase PMSM with third harmonic injection, Proceedings of the CSEE, 34, 24, pp. 4101-4108, (2014)
  • [5] Li Jianhua, Du Bochao, Zhao Tianxu, Et al., Current sensor fault-tolerant control for five-phase PMSM drives based on third-harmonic space, IEEE Transactions on Industrial Electronics, 69, 10, pp. 9827-9837, (2022)
  • [6] Huang Linsen, Zhao Wenxiang, Ji Jinghua, Et al., Direct torque control for dual three-phase permanent-magnet machine with improved steady-state performance, Transactions of China Electrotechnical Society, 37, 2, pp. 355-367, (2022)
  • [7] Chen Hao, He Yang, Zhao Wenxiang, Et al., Direct torque control of five-phase fault-tolerant permanent magnet vernier motor based on duty cycle modulation, Transactions of China Electrotechnical Society, 35, 5, pp. 1055-1064, (2020)
  • [8] Choi Y S, Choi H H, Jung J W., Feedback linearization direct torque control with reduced torque and flux ripples for IPMSM drives, IEEE Transactions on Power Electronics, 31, 5, pp. 3728-3737, (2016)
  • [9] Li Xianglin, Xue Zhiwei, Yan Xueyu, Et al., Voltage vector rapid screening-based three-vector model predictive torque control for permanent magnet synchronous motor, Transactions of China Electrotechnical Society, 37, 7, pp. 1666-1678, (2022)
  • [10] Zhao Yong, Huang Wenxin, Lin Xiaogang, Et al., Fast predictive direct torque control of dual three-phase permanent magnet fault tolerant machine based on weighting factor elimination and finite control set optimization, Transactions of China Electrotechnical Society, 36, 1, pp. 3-14, (2021)
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