Abstract：The application of fault-tolerant permanent magnet rim drive motor (FTPM-RDM) in the rim-driven thruster (RDT) can improve the space utilization and efficiency of the ship, and significantly improve the reliability of the propulsion system. In recent years, scholars have proposed direct torque control, model predictive current control and other control algorithms for FTPM-RDM, but there are problems such as complex algorithm and slow response speed. With the traditional current hysteresis band pulse width modulation (CHBPWM) control strategy, each phase winding of FTPM-RDM can be controlled separately, which has the advantages of simple algorithm and fast fault tolerant control of open-circuit and short-circuit fault. However, due to the limitation of the operation speed of the digital controller and the switching frequency allowed by the power devices, the traditional CHBPWM control strategy has the disadvantages of large current ripple and high distortion rate, resulting in large torque ripple. To solve this problem, this paper proposes a predictive duty cycle CHBPWM control strategy, which can effectively improve current control accuracy and reduce motor torque ripple while retaining the simplicity and fast response of traditional CHBPWM algorithm. The FTPM-RDM predictive duty cycle CHBPWM control system is a dual closed-loop vector control method using an outer loop for speed and an inner loop for current. First, the error between the given speed and the actual speed is obtained through PI regulator and coordinate transformation to obtain the given value of each phase current in the static coordinate system. Then, the predicted current hysteresis width of each phase winding in the next cycle is obtained through the rotor position, electrical angular velocity and DC bus voltage of the motor at the current moment. Then, the predicted duty cycle of each phase is obtained according to the actual current relative hysteresis position to achieve the closed-loop control of the motor. At the same time, combined with fault-tolerant control strategy, one phase open and short circuit fault tolerant control of motor can be realized. This method optimizes the traditional CHBPWM control by predicting the current hysteresis width and duty cycle of a single sampling period in real time, effectively improving the control accuracy of motor phase current. Comparing the simulation results of the two control strategies, the predicted duty cycle CHBPWM control strategy has significantly less current harmonics and pulsations than the traditional CHBPWM control strategy under the healthy, one phase open-circuit and short-circuit conditions. The torque ripple of the former is 1.47%, 3.20% and 5.40% respectively, while that of the latter is 14.13%, 16.07% and 19.93%. The torque ripple of the former is obviously smaller than that of the latter. Comparing the experimental data of the two control strategies, the measured current waveform and torque waveform obtained by the predictive duty cycle CHBPWM control are more accurate than those obtained by the traditional CHBPWM control before and after the open-circuit fault and under the condition of one phase short-circuit fault. The current ripple and distortion degree of the former are obviously smaller than those of the latter. The torque ripple of the former is 17.14%, 22.86% respectively, and the torque ripple of the latter is 28.57%, 42.86%, The torque ripple of the former is obviously smaller than that of the latter. The simulation and experimental results show that the predictive duty cycle CHBPWM control algorithm has a good effect in restraining the torque ripple, reducing the current ripple and harmonic distortion of the motor under the same working conditions, whether the motor is in the healthy, one phase open-circuit or short-circuit fault conditions, and solves the problem that the switching frequency of the traditional CHBPWM control algorithm is not fixed, and the control accuracy is low under the fixed sampling frequency, while retaining the advantages of the CHBPWM algorithm's simplicity and fast system response.
王志彬, 朱景伟, 赵锡阳, 刘咏涵, 曹海川. 永磁容错轮缘推进电机预测占空比电流滞环控制[J]. 电工技术学报, 2023, 38(3): 670-679.
Wang Zhibin, Zhu Jingwei, Zhao Xiyang, Liu Yonghan, Cao Haichuan. Predictive Duty Cycle Current Hysteresis Control for Fault-Tolerant Permanent Magnet Rim Drive Motor. Transactions of China Electrotechnical Society, 2023, 38(3): 670-679.
[1] 杨植, 严新平, 欧阳武, 等. 船舶轮缘推进装置驱动电机及控制方法研究进展[J]. 电工技术学报, 2022, 37(12): 2949-2960. Yang Zhi, Yan Xinping, Ouyang Wu, et al.A Review of electric motor and control technology for rim-driven thruster[J]. Transactions of China Electrotechnical Society, 2022, 37(12): 2949-2960. [2] Ojaghlu P, Vahedi A.Specification and design of ring winding axial flux motor for rim-driven thruster of ship electric propulsion[J]. IEEE Transactions on Vehicular Technology, 2019, 68(2): 1318-1326. [3] Hassannia A, Darabi A.Design and performance analysis of superconducting rim-driven synchronous motors for marine propulsion[J]. IEEE Transactions on Applied Superconductivity, 2014, 24(1): 40-46. [4] 陈文汉, 孙丹, 王铭泽. 断相故障下开绕组永磁同步电机模型预测控制容错控制策略研究[J]. 电工技术学报, 2021, 36(1): 77-86. Chen Wenhan, Sun Dan, Wang Mingze.Research on fault-tolerance strategy based on model predictive control for open-winding PMSM system under open-phase fault[J]. Transactions of China Electrotechnical Society, 2021, 36(1): 77-86. [5] Ma Rui, Zhu Jingwei, Lin Qianhong, et al.Influence of winding distribution on fault tolerant performance in a fault-tolerant permanent magnet rim driven motor[J]. IEEE Access, 2019, 7: 183236-183244. [6] 赵凯辉, 周瑞睿, 冷傲杰, 等. 一种永磁同步电机的有限集无模型容错预测控制算法[J]. 电工技术学报, 2021, 36(1): 27-38. Zhao Kaihui, Zhou Ruirui, Leng Aojie, et al.Finite control set model-free fault-tolerant predictive control for permanent magnet synchronous motor[J]. Transactions of China Electrotechnical Society, 2021, 36(1): 27-38. [7] Niu Feng, Chen Xi, Huang Shaopo, et al.Model predictive current control with adaptive-adjusting timescales for PMSMs[J]. CES Transactions on Electrical Machines and Systems, 2021, 5(2): 108-117. [8] Kapat S.Parameter-insensitive mixed-signal hysteresis-band current control for point-of-load converters with fixed frequency and robust stability[J]. IEEE Transactions on Power Electronics, 2017, 32(7): 5760-5770. [9] Lin Xiaogang, Huang Wenxin, Wang Le.SVPWM strategy based on the hysteresis controller of zero-sequence current for three-phase open-end winding PMSM[J]. IEEE Transactions on Power Electronics, 2019, 34(4): 3474-3486. [10] Jayaprakasan S, Ashok S, Ramchand R.Current error space vector based hysteresis controller for VSI fed PMSM drive[J]. IEEE Transactions on Power Electronics, 2020, 35(10): 10690-10699. [11] 叶满园, 任威, 李宋, 等. 基于控制载波自由度的级联H桥逆变器改进型PWM技术[J]. 电工技术学报, 2021, 36(14): 3010-3021. Ye Manyuan, Ren Wei, Li Song, et al.Improved PWM technology of cascaded H-bridge inverter based on control of carrier degree of freedom[J]. Transactions of China Electrotechnical Society, 2021, 36(14): 3010-3021. [12] Zhu Jingwei, Bai Hongfen, Wang Xia, et al.Current vector control strategy in a dual-winding fault-tolerant permanent magnet motor drive[J]. IEEE Transactions on Energy Conversion, 2018, 33(4): 2191-2199. [13] 李国华, 刘春武, 汪玉凤. 单相逆变器随机PWM选择性消谐滞环随机扩频方法[J]. 电工技术学报, 2021(6): 1279-1289. Li Guohua, Liu Chunwu, Wang Yufeng.A novel hysteresis random spread-spectrum method in random PWM selective harmonic elimination for single-phase inverter[J]. Transactions of China Electrotechnical Society, 2021(6): 1279-1289. [14] 廖金国, 花为, 程明, 等. 一种永磁同步电机变占空比电流滞环控制策略[J]. 中国电机工程学报, 2015, 35(18): 4762-4770. Liao Jinguo, Hua Wei, Cheng Ming, et al.A variable-duty-cycle current-hysteresis control strategy for permanent magnet synchronous motors[J]. Proceedings of the CSEE, 2015, 35(18): 4762-4770. [15] Jiang Xuefeng, Wang Shaoshuai, Li Qiang, et al.Design and optimization of dual-winding fault-tolerant permanent magnet motor[J]. CES Transactions on Electrical Machines and Systems, 2019, 3(1): 45-53. [16] 李小庆, 朱景伟, 孙军浩, 等. 双绕组永磁容错电机矢量控制系统研究[J]. 电工技术学报, 2016, 31(5): 26-34. Li Xiaoqing, Zhu Jingwei, Sun Junhao, et al.Study on the vector control system for dual winding fault-tolerant permanent magnet motors[J]. Transactions of China Electrotechnical Society, 2016, 31(5): 26-34. [17] Liu Chaonan, Pan Zhiyuan, Wang Jinliang, et al.Development of distributed photovoltaic grid-connected simulation system based on StarSim platform[C]//2020 IEEE 3rd Student Conference on Electrical Machines and Systems (SCEMS), Jinan, China, 2021: 843-846.
2023, Vol. 38 
