A Global-Speed-Region Voltage Angle Control Method Considering Dead-Time Effect Compensation for Permanent Magnet Synchronous Motor Drives

Abstract

The voltage utilization in the PMSM control can be improved through the voltage angle control (VAC) method, thereby enhancing the control efficiency and output power capability. However, the traditional VAC method can only be applied to a high-speed region, and it is still necessary to switch to another control mode in the low-speed region, resulting in a significant torque jitter during the switching process. Meanwhile, the deviation between the actual current operating point and the optimal one is caused by the dead-time effect in the traditional VAC method, causing more energy loss. To solve these problems, a global-speed-region VAC method considering dead-time effect compensation is proposed in this article. Firstly, the application area of the proposed method is extended to both the high-speed and low-speed region on the basis of analyzing the variation function of the modulation index (MI), achieving global non-mode-switching control and eliminating the torque jitter. Additionally, the relationship between the dead time and MI is quantitatively analyzed, and a global-speed-region VAC method is proposed to compensate the dead-time effect and reduce the energy loss. Finally, the effectiveness of the proposed method is verified in PMSM bench experiments.