Delay compensation strategy of flying‑capacitors for five‑level ANPC converters

Zhan Liu; Junru Chen; Zhenglong Xia; Daopeng Ren

Delay compensation strategy of flying‑capacitors for five‑level ANPC converters

Vol. 25, No. 6, pp. 1004-1015, Jun. 2025

10.1007/s43236-025-00993-8

Five-level active neutral-point clamped converter

Flying-capacitor voltage

Over-charge and over-discharge

Delay compensation strategy

Abstract

The five-level active neutral point clamped (5L-ANPC) converter has great potential for medium-voltage high-power applications. However, the effect of the system computational time-delay is not considered in existing flying-capacitor (FC) voltage balance methods. This computational time-delay can lead to flying-capacitor over-charge and over-discharge problems. To solve these problems, the processes of flying-capacitor over-charge and over-discharge are theoretically analyzed and a delay compensation strategy is proposed. With this strategy, the problem of FC over-charge and over-discharge can be effectively overcome. Finally, simulation and experimental results are presented to validate the effectiveness of the proposed strategy.

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Cite this article

[IEEE Style]

Z. Liu, J. Chen, Z. Xia, D. Ren, "Delay compensation strategy of flying‑capacitors for five‑level ANPC converters," Journal of Power Electronics, vol. 25, no. 6, pp. 1004-1015, 2025. DOI: 10.1007/s43236-025-00993-8.

[ACM Style]

Zhan Liu, Junru Chen, Zhenglong Xia, and Daopeng Ren. 2025. Delay compensation strategy of flying‑capacitors for five‑level ANPC converters. Journal of Power Electronics, 25, 6, (2025), 1004-1015. DOI: 10.1007/s43236-025-00993-8.