Research on overvoltage suppression of three‑level converter based on two-three phase mixed conduction mode

Sifeng Zhao; Caiyong Ye; Shanming Wan

Research on overvoltage suppression of three‑level converter based on two-three phase mixed conduction mode

Sifeng Zhao

Caiyong Ye

Shanming Wan

Vol. 24, No. 2, pp. 239-248, Feb. 2024

10.1007/s43236-023-00720-1

High-speed brushless direct current motor

Three-level converter

Overvoltage suppression

Mixed conduction mode

Abstract

For medium and high voltage drives, the three-level converter has better technical and economical performances than the two-level converter. Permanent magnetic brushless DC (BLDC) motors are widely used due to their simple control, lowresolution requirement of the position sensor, and high power density. The power switching devices in the non-conducting phase are blocked all the time when the two-phase conduction mode is used. Serious overvoltage of the inner power switching device occurs, which triggers the overvoltage alarm or causes system failure. In this paper, the overvoltage mechanism of the inner power switching device is analyzed in detail, and a mixed conduction mode containing a three-phase conduction mode in the first stage and a two-phase conduction mode in the second stage is proposed. The speed threshold for the switching of the two control modes is designed to suppress overvoltage in the starting stage and to reduce the loss of the converter at high speeds. The effectiveness of the overvoltage suppression and system safety of the proposed mixed conduction mode are verified by simulations and experiments.

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Cite this article

[IEEE Style]

S. Zhao, C. Ye, S. Wan, "Research on overvoltage suppression of three‑level converter based on two-three phase mixed conduction mode," Journal of Power Electronics, vol. 24, no. 2, pp. 239-248, 2024. DOI: 10.1007/s43236-023-00720-1.

[ACM Style]

Sifeng Zhao, Caiyong Ye, and Shanming Wan. 2024. Research on overvoltage suppression of three‑level converter based on two-three phase mixed conduction mode. Journal of Power Electronics, 24, 2, (2024), 239-248. DOI: 10.1007/s43236-023-00720-1.