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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.
This paper presents a sector subdivision based space vector pulse width modulation (SVPWM) strategy with reduced current ripple for a three-level inverter. Using the output current ripple theory, closed-form expressions of average current ripple vectors for both continuous and discontinuous switching sequences are derived. Based on the sector and triangle distributions of conventional SVPWM strategy, each triangle is further divided into three small-regions. Then the switching sequence with the lowest magnitude of the average current ripple vector is applied in every small-region, so that the advantages of continuous pulse width modulation (CPWM) and discontinuous pulse width modulation (DPWM) under different modulation index conditions are combined to reduce the current ripple in the whole modulation range. The output performance of the proposed strategy is compared with the conventional CPWM and DPWM strategy, and experimental results verify that the proposed strategy could reduce the current ripple of three-level inverters effectively.
Guozheng Zhang; Bingxu Wei; Xin Gu; Xinmin Li; Zhanqing Zhou; Wei Chen. Sector Subdivision Based SVPWM Strategy of Neutral-Point-Clamped Three-Level Inverter for Current Ripple Reduction. Energies 2019, 12, 2734 .
AMA StyleGuozheng Zhang, Bingxu Wei, Xin Gu, Xinmin Li, Zhanqing Zhou, Wei Chen. Sector Subdivision Based SVPWM Strategy of Neutral-Point-Clamped Three-Level Inverter for Current Ripple Reduction. Energies. 2019; 12 (14):2734.
Chicago/Turabian StyleGuozheng Zhang; Bingxu Wei; Xin Gu; Xinmin Li; Zhanqing Zhou; Wei Chen. 2019. "Sector Subdivision Based SVPWM Strategy of Neutral-Point-Clamped Three-Level Inverter for Current Ripple Reduction." Energies 12, no. 14: 2734.
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.