Neutral-Point Voltage Balancing Method for Three-Phase Three-Level Dual-Active-Bridge Converters

Xinmi Wu, Yu Zhang () and Jiawen Yang
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Xinmi Wu: The State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Yu Zhang: The State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Jiawen Yang: The State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

Energies, 2022, vol. 15, issue 17, 1-21

Abstract: Three-phase three-level dual-active-bridge (3L-DAB3) converters are a potential topology for high-voltage and high-power applications. Neutral-point voltage balancing is a complex and important issue for three-level (3L) circuits. Compared with the single-phase 3L dual-active-bridge converter, the self-balancing capability of the 3L-DAB3 is limited. To guarantee the reliability of the converter, a neutral-point voltage balancing method for the 3L-DAB3 is proposed in this paper. First, the neutral-point voltage balancing principle of the 3L-DAB3 is analyzed. Then, the relationship between the duty ratio adjustment and injected neutral-point charge is described. In order to guarantee accurate neutral-point voltage balance, the proposed balancing method adopts a sign-hysteresis control with a dead zone. The dead zone is responsible for whether the duty ratio adjustment is activated, and the sign-hysteresis control guarantees a correct adjustment direction. The proposed neutral-point voltage balancing method only needs to sample the capacitor voltages, thus avoiding a complex parameter design and making it easy to implement. The transmission power of the converter is not affected during the adjustment process. The proposed balancing method has a rapid response speed and does not have problems with respect to stability. Finally, experiments were conducted on a 3.6 kW laboratory prototype. The validity and performance of the proposed neutral-point voltage balancing method were verified on the basis of the simulation and experimental results.

Keywords: dual-active-bridge; three-level circuit; three-phase three-level dual-active-bridge; neutral-point voltage balancing; hysteresis control; dead zone (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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