DC-Link Current Control with Inverter Nonlinearity Compensation for Permanent Magnet Synchronous Motor Drives

Kan Wang, Zhong Wu and Zhongyi Chu
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Kan Wang: School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing 100191, China
Zhong Wu: School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing 100191, China
Zhongyi Chu: School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing 100191, China

Energies, 2020, vol. 13, issue 3, 1-16

Abstract: For permanent magnet synchronous motors (PMSMs) supplied with a voltage source inverter, current control strategies are commonly implemented under the synchronously rotating reference frame. In order to simplify the system structure, three-phase currents can be measured with a single DC-link current sensor using the phase current reconstruction technique. However, it still needs to follow the conventional AC current control approach. In this paper, a DC-link current control method for PMSMs is proposed to further simplify the control system. The problem of phase current control was separated into the problems of amplitude control and phase control. Then, amplitude control was achieved using a closed-loop controller directly tracking the DC-link current; while phase control was achieved by AC-side pulse width modulation (PWM) following the phase angle of back electromotive force. The compensation for nonlinear distortion of the inverter was taken into account during the control process. Finally, the proposed method realized three-phase current control with a single current sensor and controller, and achieved the purpose of electromagnetic torque control. Experimental results demonstrate the effectiveness of the proposed method.

Keywords: permanent magnet synchronous motor (PMSM); phase current control; voltage source inverter (VSI); system simplification; DC-link current (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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