Active zero‑sequence voltage injection modulation strategy for capacitor current suppression in dual sector PMSM systems

This article proposes an active zero-sequence voltage injection space vector pulsewidth modulation strategy (AZSV-SVPWM) to suppress capacitor current in the common DC-link capacitor of a dual three-phase inverter. Suppressing capacitor current is crucial to improve the power density and reliability of traction inverters, especially in a dual sector three-phase permanent magnet synchronous motor (PMSM) system, since this necessitates multiple sets of capacitors when arranged as multiple conventional three-phase inverters. The impact of the DC off set of zero-sequence voltage on output voltage and capacitor current is quantified based on double Fourier analysis and experimental verifi cation. According to a frequency domain model for the common DC-link capacitor current, it can be concluded that an appropriate combination of the zero-sequence voltages of two sets of inverters can suppress the capacitor current. The AZSV-SVPWM is proposed and implemented by adjusting the distribution of two zero-vectors among the space vectors. With the application of the proposed method, the capacitor current RMS can be suppressed by up to 74.46%.

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Cite this article

[IEEE Style]

Y. Shao, W. Kong, Z. Liu, H. Guo, L. Wang, D. Li, R. Qu, "Active zero‑sequence voltage injection modulation strategy for capacitor current suppression in dual sector PMSM systems," Journal of Power Electronics, vol. 25, no. 2, pp. 238-249, 2025. DOI: 10.1007/s43236-024-00896-0.

[ACM Style]

Yifei Shao, Wubin Kong, Zirui Liu, Haifeng Guo, Longxiao Wang, Dawei Li, and Ronghai Qu. 2025. Active zero‑sequence voltage injection modulation strategy for capacitor current suppression in dual sector PMSM systems. Journal of Power Electronics, 25, 2, (2025), 238-249. DOI: 10.1007/s43236-024-00896-0.