In permanent magnet synchronous motor (PMSM) drives without electrolytic capacitors, modulation index (MI) fluctuation leads to a lower dc-link voltage utilization under flux-weakening (FW) control. In this article, an adaptive MI fluctuation suppression strategy is proposed to enhance the voltage output capability of the inverter. The mechanism of MI fluctuation is analyzed through impedance modeling of the drive system. Furthermore, the influence of dc-link voltage utilization is analyzed based on the impedance relationship between MI and rectified voltage. To suppress the MI fluctuation, harmonics of the dc-link voltage and motor voltage vector reference are extracted to generate compensation voltage angle by considering the average of MI. Through a closed-loop regulation of the voltage vector reference with angle compensation, adaptive suppression of MI fluctuation can be achieved. Furthermore, the coefficient of the FW controller is adaptively regulated according to the peak value of MI. Finally, the effectiveness of the proposed control strategy is verified on an electrolytic capacitorless PMSM platform.
Adaptive Modulation Index Fluctuation Suppression Strategy for Electrolytic Capacitorless PMSM Drives
IEEE Transactions on Transportation Electrification ; 11 , 2 ; 6406-6417
2025-04-01
3197594 byte
Article (Journal)
Electronic Resource
English
Feedforward FLC for PMSM Drives [20014544]
British Library Conference Proceedings | 2001
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