The Transactions of The Korean Institute of Electrical Engineers (전기학회논문지)

The Korean Institute of Electrical Engineers (대한전기학회)
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Voltage Balancing Control of Input Voltage Source Employing Series-connected Capacitors in 7-level PWM Inverter

7-레벨 PWM 인버터의 직렬 커패시터 입력전원의 전압균형제어

  • Kim, Jin-San (Dept. of Control and Instrumentation Engineering, Hanbat National University) ;
  • Kang, Feel-soon (Dept. of Electrical and Electronic Engineering, Hanbat National University)
  • Received : 2017.10.31
  • Accepted : 2018.01.19
  • Published : 2018.02.01
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Abstract

This paper present a 7-level PWM inverter adopting voltage balancing control to series-connected input capacitors. The prior proposed 7-level PWM inverter consists of dc input source, three series-connected capacitors, two bidirectional switch modules, and an H-bridge. This circuit topology is useful to increase the number of output voltage levels, however it fails to generate 7-level in output voltage without consideration for voltage balancing among series-connected capacitors. Capacitor voltage imbalance is caused on the different period between charging and discharging of capacitor. To solve this problem, we uses the amplitude modulation of carrier wave, which is used to produce the center output voltage level. To verify the validity of the proposed control method, we carried out computer-aided simulation and experiments using a prototype.

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References

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