Novel Five-Level Three-Phase Hybrid-Clamped Converter with Reduced Components

Bin Chen; Wenxi Yao; Zhengyu Lu

Novel Five-Level Three-Phase Hybrid-Clamped Converter with Reduced Components

Bin Chen

Wenxi Yao

Zhengyu Lu

Vol. 14, No. 6, pp. 1119-1129, Nov. 2014

10.6113/JPE.2014.14.6.1119

Capacitor precharge

Capacitor-voltage balancing

Hybrid-clamped converters

Multilevel converters

Space vector modulation

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Abstract

This study proposes a novel five-level three-phase hybrid-clamped converter composed of only six switches and one flyingcapacitor (FC) per phase. The capacitor-voltage-drift phenomenon of the converter under the classical sinusoidal pulse widthmodulation (SPWM) strategy is comprehensively analyzed. The average current, which flows into the FC, is a function of powerfactor and modulation index and does not remain at zero. Thus, a specific modulation strategy based on space vector modulation(SVM) is developed to balance the voltage of DC-link and FCs by injecting a common-mode voltage. This strategy applies thefive-segment method to synthesize the voltage vector, such that switching losses are reduced while optional vector sequences areincreased. The best vector sequence is then selected on the basis of the minimized cost function to suppress the divergence of thecapacitor voltage. This study further proposes a startup method that charges the DC-link and FCs without any additional circuits. Simulation and experimental results verify the validity of the proposed converter, modulation strategy, and precharge method

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Cite this article

[IEEE Style]

B. Chen, W. Yao, Z. Lu, "Novel Five-Level Three-Phase Hybrid-Clamped Converter with Reduced Components," Journal of Power Electronics, vol. 14, no. 6, pp. 1119-1129, 2014. DOI: 10.6113/JPE.2014.14.6.1119.

[ACM Style]

Bin Chen, Wenxi Yao, and Zhengyu Lu. 2014. Novel Five-Level Three-Phase Hybrid-Clamped Converter with Reduced Components. Journal of Power Electronics, 14, 6, (2014), 1119-1129. DOI: 10.6113/JPE.2014.14.6.1119.