Abstract
Aiming at capacitor voltage offset (CVO) in permanent magnet synchronous motor (PMSM) driven by three-phase four-switch inverter (TPFSI), the paper proposes a strategy to resist voltage drift with dynamic voltage compensation. A correction factor is introduced to adjust the capacitor voltage applied to Space Vector Pulse Width Modulation (SVPWM). Then, the additionally superimposed component controlled by the correction factor will be injected into the component of the actual output voltage vector on the α-axis. The additionally superimposed component is adjusted by setting the appropriate correction factor to cancel the CVO on the α-axis. By setting a controllable variable correction factor, its anti-offset characteristics can ensure the continuous and stable operation of the system. However, the scheme introduces torque ripple. The strategy adopts double closed-loop control. Experimental results on a 1 kW PMSM prototype show that the proposed scheme can effectively suppress CVO and torque ripple.
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