A novel medium voltage five‑level converter with minimized volume

Zhifeng Deng; Jinjun Liu; Sixing Du

A novel medium voltage five‑level converter with minimized volume

Zhifeng Deng

Jinjun Liu

Sixing Du

Vol. 22, No. 10, pp. 1676-1686, Oct. 2022

10.1007/s43236-022-00481-3

Multilevel converter

Medium voltage high power

DC-AC power conversion

Phase-shift pulse width

Abstract

In applications such as ship propulsion and off-shore wind power generation, it is important to minimize the volume of medium voltage power converters. To make this possible, a novel five-level converter topology is proposed in this paper. This converter is realized by connecting two half-bridge (HB) cells with a three-level neutral point clamped (3L-NPC) unit. In each HB cell, the switches are directly clamped to DC side capacitors where the larger volume high-voltage flying capacitors are avoided. By adopting the 3L-NPC unit, the volume of the proposed converter is further reduced. A comprehensive comparison result shows that the volume of the proposed converter is more than 7% less than existing five-level converters. The operation principle and modulation method of this converter are also introduced. Based on the phase-shift pulse width modulation (PS-PWM) method, the capacitor voltages of the proposed converter can be self-balanced. Simulation and experiment results are shown to verify the performance of this converter and the validity of the theoretical analysis.

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Cite this article

[IEEE Style]

Z. Deng, J. Liu, S. Du, "A novel medium voltage five‑level converter with minimized volume," Journal of Power Electronics, vol. 22, no. 10, pp. 1676-1686, 2022. DOI: 10.1007/s43236-022-00481-3.

[ACM Style]

Zhifeng Deng, Jinjun Liu, and Sixing Du. 2022. A novel medium voltage five‑level converter with minimized volume. Journal of Power Electronics, 22, 10, (2022), 1676-1686. DOI: 10.1007/s43236-022-00481-3.