The Transactions of the Korean Institute of Power Electronics (전력전자학회논문지)

The Korean Institute of Power Electronics (전력전자학회)
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Simple Compensation Method of Unclamped Switch Voltages in a Three-Level NPC Inverter

3-레벨 NPC 인버터에서 클램핑되지 않는 스위치 전압의 간단한 보상기법

  • Received : 2013.12.26
  • Accepted : 2014.03.11
  • Published : 2014.06.20
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Abstract

This paper proposes a simple compensation method for switches of the unclamped voltage in the three-level NPC inverter. Voltages of inner-switches can be unclamped in the three-level NPC (neutral point clamped) inverter. It can cause the problem of the switch fault accident. By adding a capacitor, switches of the unclamped voltage can be clamped. Through the analysis of the circuit, the reason behind switches being unclamped was verified which leads to the solution method that designs a compensation capacitor. The proposed method was validated through the simulation and experimental results.

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References

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