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Aimed at reducing the switching loss and common-mode voltage amplitude of high-power medium-voltage three-level inverter under low modulation index conditions, an improved synchronous space vector PWM strategy is proposed in this paper. The switching times in each fundamental period are reduced by the re-division of small regions and the full use of the redundant switching state. The sum of switching algebra is introduced as an evaluation index and the switching state with the minimum value of the sum of switching algebra are adopted. Then, the common mode voltage amplitude is reduced. The theoretical analysis and experimental results show that the improved modulation strategy proposed in this paper can effectively reduce the switching loss and common-mode voltage amplitude of the inverter under the condition of the low modulation index. Moreover, the neutral-point voltage ripple is also reduced simultaneously.
Xin Gu; Bingxu Wei; Guozheng Zhang; Zhiqiang Wang; Wei Chen; Gu; Wei; Wang; Chen. Improved Synchronized Space Vector PWM Strategy for Three-Level Inverter at Low Modulation Index. Electronics 2019, 8, 1400 .
AMA StyleXin Gu, Bingxu Wei, Guozheng Zhang, Zhiqiang Wang, Wei Chen, Gu, Wei, Wang, Chen. Improved Synchronized Space Vector PWM Strategy for Three-Level Inverter at Low Modulation Index. Electronics. 2019; 8 (12):1400.
Chicago/Turabian StyleXin Gu; Bingxu Wei; Guozheng Zhang; Zhiqiang Wang; Wei Chen; Gu; Wei; Wang; Chen. 2019. "Improved Synchronized Space Vector PWM Strategy for Three-Level Inverter at Low Modulation Index." Electronics 8, no. 12: 1400.
Interior permanent magnet synchronous motors (IPMSMs) are usually used in electric vehicle drives and in other applications. In order to enlarge the speed range of IPMSMs, the flux-weakening control method is adopted. The traditional flux-weakening control strategy degrades the control performance because of parameter mismatches caused by variation of motor parameters. An improved uncertainty and disturbance estimator (UDE)-based flux-weakening control strategy is proposed for IPMSM drives in this paper. The parameter tuning method in the UDE-based control is improved. In addition, a flux-weakening adjusting factor is put forward to reduce the torque fluctuation when the operation point switches between the constant torque region and the flux-weakening region. This factor can be adjusted online by a lookup table. Finally, the validity of proposed method is verified by the simulation and experimental results. The results show that the proposed control strategy can effectively enhance the robustness of the system in the flux-weakening region, and make the system switch more smoothly between the constant torque region and the flux-weakening region.
Xin Gu; Tao Li; Xinmin Li; Guozheng Zhang; Zhiqiang Wang; Li; Gu; Wang. An Improved UDE-Based Flux-Weakening Control Strategy for IPMSM. Energies 2019, 12, 4077 .
AMA StyleXin Gu, Tao Li, Xinmin Li, Guozheng Zhang, Zhiqiang Wang, Li, Gu, Wang. An Improved UDE-Based Flux-Weakening Control Strategy for IPMSM. Energies. 2019; 12 (21):4077.
Chicago/Turabian StyleXin Gu; Tao Li; Xinmin Li; Guozheng Zhang; Zhiqiang Wang; Li; Gu; Wang. 2019. "An Improved UDE-Based Flux-Weakening Control Strategy for IPMSM." Energies 12, no. 21: 4077.
An improved direct torque control with space-vector modulation (DTC-SVM) scheme is presented in this paper. In the conventional DTC-SVM scheme, torque control performance is affected by the load conditions, due to the inappropriate linearization of the relationship between the flux angle and electromagnetic torque. Different from the conventional method, a torque controller with load angle estimation (TC-LAE) is proposed and the change rate of torque is regulated according to the variation of the load conditions, which could ensure the rapidity and consistency of torque performance at different load conditions. Meanwhile, an online permanent magnet synchronous motor and maximum torque per ampere (PMSM-MTPA) operation strategy based on the fitting solving method is proposed instead of the traditional two-dimensional look-up table, and the reference value of flux amplitude is calculated online to meet the MTPA requirement with the proposed method. The improved strategy is applied on a 6 kW PMSM, and the simulation and experimental results verified the effectiveness and the feasibility of the proposed strategy.
Zhanqing Zhou; Xin Gu; Zhiqiang Wang; Guozheng Zhang; Qiang Geng; Zhou; Gu; Wang; Geng. An Improved Torque Control Strategy of PMSM Drive Considering On-Line MTPA Operation. Energies 2019, 12, 2951 .
AMA StyleZhanqing Zhou, Xin Gu, Zhiqiang Wang, Guozheng Zhang, Qiang Geng, Zhou, Gu, Wang, Geng. An Improved Torque Control Strategy of PMSM Drive Considering On-Line MTPA Operation. Energies. 2019; 12 (15):2951.
Chicago/Turabian StyleZhanqing Zhou; Xin Gu; Zhiqiang Wang; Guozheng Zhang; Qiang Geng; Zhou; Gu; Wang; Geng. 2019. "An Improved Torque Control Strategy of PMSM Drive Considering On-Line MTPA Operation." Energies 12, no. 15: 2951.
In conventional model predictive control, the dimensions of the control variables are different from each other, which makes adjusting the weighted factors in the cost function complicated. This issue can be solved by adopting the model predictive flux control. However, the performance of the electromagnetic torque is affected by the change of the cost function. A novel model predictive torque control of the interior permanent magnet synchronous motor is presented in this paper, and the cost function involving the excitation torque and reluctance torque is established. Combined with the model predictive flux control and discrete space vector modulation, the current ripple and torque ripple are reduced. The performance of torque under an overload condition is superior to model predictive flux control. The effectiveness of the proposed algorithm is verified by the simulation and experimental results.
Guozheng Zhang; Chen Chen; Xin Gu; Zhiqiang Wang; Xinmin Li. An Improved Model Predictive Torque Control for a Two-Level Inverter Fed Interior Permanent Magnet Synchronous Motor. Electronics 2019, 8, 769 .
AMA StyleGuozheng Zhang, Chen Chen, Xin Gu, Zhiqiang Wang, Xinmin Li. An Improved Model Predictive Torque Control for a Two-Level Inverter Fed Interior Permanent Magnet Synchronous Motor. Electronics. 2019; 8 (7):769.
Chicago/Turabian StyleGuozheng Zhang; Chen Chen; Xin Gu; Zhiqiang Wang; Xinmin Li. 2019. "An Improved Model Predictive Torque Control for a Two-Level Inverter Fed Interior Permanent Magnet Synchronous Motor." Electronics 8, no. 7: 769.