Proceedings of the KIPE Conference (전력전자학회:학술대회논문집)

The Korean Institute of Power Electronics (전력전자학회)
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Evaluation of Power Flow Control Strategy and DC-link Voltage Regulation for DC Microgrid

  • Nguyen, Thanh Van (Dept. of Electrical and Information Eng., Seoul National University of Science and Technology) ;
  • Kim, Kyeong-Hwa (Dept. of Electrical and Information Eng., Seoul National University of Science and Technology)
  • Published : 2019.07.02
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Abstract

In this paper, an effective power flow control strategy (PFCS) based on the centralized control approach and a DC-link (DCV) restoration algorithm for DC microgrid (DCMG) are presented. By investigating the statuses of system power units, eleven operating modes are given to ensure the system power balance under various conditions. To avoid the system power imbalance caused by the delay of grid fault detection, a reliable DCV restoration algorithm is proposed. In the proposed scheme, when an abnormal variation of the DCV is detected, the battery instantly starts a local emergency control mode to restore the DCV to the nominal value regardless of the control mode from the central controller. The simulations and experiments are carried out to prove the effectiveness of the PFCS and the proposed DCV restoration algorithm.

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