Neutral-point Voltage Balancing Strategy for Three-level Converter based on Disassembly of Zero Level

Chenchen Wang; Zhitong Li; Hongliang Xin

Neutral-point Voltage Balancing Strategy for Three-level Converter based on Disassembly of Zero Level

Chenchen Wang

Zhitong Li

Hongliang Xin

Vol. 19, No. 1, pp. 79-88, Jan. 2019

10.6113/JPE.2019.19.1.79

Balancing algorithm

Neutral-point-clamped

Neutral-point voltage

Zero-level disassembly

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Abstract

The neutral-point (NP) voltage of three-phase three-level NP-clamped converters is needed for balance. To maintain NP potential and suppress ripple, a novel NP voltage balancing strategy is proposed in this work. The mechanism of NP voltage variation is studied first. Then, the relationship between the disassembly of zero level (O level) and NP current is studied comprehensively. On these bases, two methods for selecting one of three output phases for the disassembly of its O level are presented. Finally, simulation and experimental results verify the validity and practicability of the proposed algorithms.

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Cite this article

[IEEE Style]

C. Wang, Z. Li, H. Xin, "Neutral-point Voltage Balancing Strategy for Three-level Converter based on Disassembly of Zero Level," Journal of Power Electronics, vol. 19, no. 1, pp. 79-88, 2019. DOI: 10.6113/JPE.2019.19.1.79.

[ACM Style]

Chenchen Wang, Zhitong Li, and Hongliang Xin. 2019. Neutral-point Voltage Balancing Strategy for Three-level Converter based on Disassembly of Zero Level. Journal of Power Electronics, 19, 1, (2019), 79-88. DOI: 10.6113/JPE.2019.19.1.79.