Research on a Thirteen-Level Switched Capacitor Inverter with Low Switching Loss

Zhipeng Wu (), Yuanhuang Liu, Tianchu Li, Ming Fang, Junfeng Liu and Chunyan Huang
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Zhipeng Wu: Hainan Power Grid Co., Ltd., Electric Power Science Research Institute, Haikou 570105, China
Yuanhuang Liu: Hainan Power Grid Co., Ltd., Electric Power Science Research Institute, Haikou 570105, China
Tianchu Li: Hainan Power Grid Co., Ltd., Electric Power Science Research Institute, Haikou 570105, China
Ming Fang: Hainan Power Grid Co., Ltd., Electric Power Science Research Institute, Haikou 570105, China
Junfeng Liu: School of Automation Science and Engineering, South China University of Technology, Guangzhou 510641, China
Chunyan Huang: Guangzhou Power Electrical Technology Co., Ltd., Guangzhou 510641, China

Energies, 2024, vol. 17, issue 20, 1-17

Abstract: This paper presents a 13-level switched capacitor inverter with a novel modulation method designed to minimize the number of switches and significantly reduce switching losses. The inverter stands out for its simplicity, requiring only ten semiconductor switches to generate 13 levels. A key feature is the inherent self-voltage balancing of the capacitors, which eliminates the need for additional control mechanisms. The inverter’s unique architecture, comprising high-voltage and low-voltage modules, enables modulation using a hybrid PWM approach that combines step waveform modulation with level-shifted PWM (LS-PWM). This innovative technique dramatically lowers the switching frequency of the high-voltage module’s switches, independent of the carrier frequency, thereby limiting the number of switches in high-frequency operation and achieving substantial reductions in switching losses. This paper provides a detailed analysis of the inverter’s operating modes, voltage-balancing mechanisms, and parameter calculations. The advantages of the topology presented in this paper are demonstrated by comparison. Finally, the simulation and experimental results confirm the practicality and effectiveness of the proposed inverter and its modulation strategy.

Keywords: switched capacitor; self-voltage balance; hybrid modulation; switching loss (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: 2024
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