Operation and Control of a Seven-Level V-Clamp Multilevel Converter

Yao Xue, Xiaofeng Yang, Lutian Yuan and Trillion Q. Zheng
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Yao Xue: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Xiaofeng Yang: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Lutian Yuan: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Trillion Q. Zheng: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China

Energies, 2019, vol. 12, issue 24, 1-13

Abstract: Multilevel converters are well suited for high-power and high-quality power conversion. This paper presents a new seven-level V-clamp multilevel converter (VMC) with reduced clamping devices. All phases of the VMC share common DC-link capacitors and realize bidirectional power conversion without flying capacitors. Each branch of the VMC sustains only a single-level voltage of the DC-link capacitors during its commutation process. Hence, the series switches can be controlled as simple as one switch and the dynamic voltage unbalancing issue is avoided. In this paper, the operation principle and the modulation method of the VMC are analyzed in detail. In addition, compensation control for non-ideal factors is designed to improve the output performance. The output fundamental distortion is compensated and the harmonics are reduced. Finally, a laboratory prototype of the seven-level VMC is set up to verify the feasibility of the presented topology and analysis.

Keywords: power conversion; multilevel converter; V-clamp; dead-time effects; compensation control (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: 2019
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