Synchronized SVPWM schemes for closed‑loop current control of three‑level NPC inverters

The traditional synchronous space vector pulse width modulation (SSVPWM) strategy mostly assumes that the vector rotates uniformly under a constant modulation index. When a current closed-loop is adopted, due to the large fluctuation of the modulation index, additional switching losses may be generated when the sector spans, especially when the number of sampling points in the sector is even. Therefore, this paper proposes a modulation method using nearest four-vector (N4V) synthesis. This method uses a zero vector as the common vector to eliminate the additional turn-on loss caused by sector crossing in the case of even sampling. In addition, it is found through experiments that when the modulation index is high, the current harmonics generated by this method are lower. This paper also studies synchronous tracking technology to ensure the correct vector angle. Simulation and experimental results verify the effectiveness of the proposed modulation strategy.

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Cite this article

[IEEE Style]

Z. Wang, K. Liu, C. Ye, S. Wan, "Synchronized SVPWM schemes for closed‑loop current control of three‑level NPC inverters," Journal of Power Electronics, vol. 25, no. 8, pp. 1490-1502, 2025. DOI: 10.1007/s43236-025-00999-2.

[ACM Style]

Zhengxiao Wang, Kaifeng Liu, Caiyong Ye, and Shanming Wan. 2025. Synchronized SVPWM schemes for closed‑loop current control of three‑level NPC inverters. Journal of Power Electronics, 25, 8, (2025), 1490-1502. DOI: 10.1007/s43236-025-00999-2.