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

The Korean Institute of Power Electronics (전력전자학회)
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A Distributed Control Method based on Voltage Sensitivity Matrix in DC Microgrids for Improvement of Power Sharing Accuracy and Voltage Regulation Performance

직류 마이크로그리드의 전력 공유 정확도 및 전압 제어 성능 향상을 위한 전압 민감도 행렬 기반의 분산 제어 방법

  • Lee, Gi-Young (Dept. of Electrical Eng., HYPEC-EECS lab., Hanyang Univ.) ;
  • Ko, Byoung-Sun (Dept. of Electrical Eng., HYPEC-EECS lab., Hanyang Univ.) ;
  • Lee, Jae-Suk (Dept. of Electrical Eng., HYPEC-EECS lab., Hanyang Univ.) ;
  • Kim, Rae-Young (Dept. of Electrical Eng., HYPEC-EECS lab., Hanyang Univ.)
  • Received : 2018.07.12
  • Accepted : 2018.08.27
  • Published : 2018.10.20
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Abstract

A distributed control method is proposed to improve the power sharing performance of bidirectional distributed generators and the voltage regulation performance of a DC bus in a DC microgrid. Voltage sensitivity analysis based on power flow analysis is conducted to analyze the structural characteristics of a DC microgrid. A distributed control method using a voltage sensitivity matrix is proposed on the basis of this analysis. The proposed method uses information received through the communication system and performs the droop gain variation method and voltage shift method without additional PI controllers. This approach achieves improved power sharing and voltage regulation performance without output transient states. The proposed method is implemented through a laboratory-scaled experimental system consisting of two bidirectional distributed generators, namely, a load and a non-dispatchable distributed generator in a four-bus ring-type model. The experimental results show improved power sharing accuracy and voltage regulation performance.

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References

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