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

The Korean Institute of Power Electronics (전력전자학회)
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Control Method of Modular Multilevel Converter to Reduce Switching Losses

스위칭 손실을 줄이기 위한 모듈형 멀티레벨 컨버터의 제어 방법

  • Park, So-Young (School of Electrical and Electronics Eng., Chung-Ang Univ.) ;
  • Kim, Jae-Chang (School of Electrical and Electronics Eng., Chung-Ang Univ.) ;
  • Kwak, Sang-Shin (School of Electrical and Electronics Eng., Chung-Ang Univ.)
  • Received : 2017.08.14
  • Accepted : 2017.09.25
  • Published : 2017.12.20
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Abstract

In this paper, a voltage-based model predictive control (MPC) scheme for a modular multilevel converter is used to reduce switching loss. The proposed method calculates an offset voltage that clamps the switching operation of submodules in which the current greatly flows at every sampling period by using the reference phase voltage and the reference phase current. To use the offset voltage, the proposed method converts the current-based MPC to the voltage-based MPC. The proposed voltage-based MPC then generates a new reference pole voltage that clamps the switching of submodules by applying the calculated offset voltage to the phase voltage. Therefore, the proposed method can reduce the switching loss by stopping the switching operation of submodules in which the current greatly flows. The switching loss reduction effect of the proposed method is verified by comparing its loss data with those of the conventional MPC method.

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References

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