Voltage Jump Suppression and Capacitor Voltage Fluctuation Analysis for a Four-Level Hybrid Flying Capacitor T-Type Converter

Chen Wei, Xibo Yuan, Juan Zhou, Kangan Wang, Yonglei Zhang and Xiaojie Wu
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Chen Wei: School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou 221116, China
Xibo Yuan: School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou 221116, China
Juan Zhou: School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou 221116, China
Kangan Wang: School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou 221116, China
Yonglei Zhang: School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou 221116, China
Xiaojie Wu: School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou 221116, China

Energies, 2019, vol. 12, issue 4, 1-16

Abstract: In low and medium voltage power conversion systems, multilevel converters are becoming more and more attractive due to improved power density. However, the complexity of topology and control is a big challenge for the application of multilevel converters. In this paper, a four-level (4L) hybrid flying capacitor (FC) T-type converter has been researched in detail. The topological advantage of the converter is displayed in comparison to existing four-level converters. According to the feature of the topology, the operating status has been analyzed and the reason for the voltage jump is researched in detail during the dead-time period. A strategy to reduce voltage jump by adjusting the switching states has be presented. The FC voltages can be balanced by selecting the appropriate switching states. The relationships between the fluctuations of FC voltages and the modulation index and power factor (PF) have been analyzed by simulation results. The performance of the 4L converter has been investigated in MATLAB/Simulink as well as on a down-scaled laboratory prototype.

Keywords: capacitor voltage fluctuation; dead-time; multilevel converter; voltage jump (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
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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