Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Hybrid Control and Protection Scheme for Inverter Dominated Microgrids

  • Xu, Xiaotong (Department of Electrical and Electronic Engineering, Xi'an Jiaotong-Liverpool University) ;
  • Wen, Huiqing (Department of Electrical and Electronic Engineering, Xi'an Jiaotong-Liverpool University) ;
  • Jiang, Lin (Department of Electrical Engineering and Electronics, University of Liverpool) ;
  • Hu, Yihua (Department of Electrical Engineering and Electronics, University of Liverpool)
  • Received : 2016.05.30
  • Accepted : 2017.01.16
  • Published : 2017.05.20
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Abstract

With the high penetration of various sustainable energy sources, the control and protection of Microgrids has become a challenging problem considering the inherent current limitation feature of inverter-based Distributed Generators (DGs) and the bidirectional power flow in Microgrids. In this paper, a hybrid control and protection scheme is proposed, which combines the traditional inverse-time overcurrent protection with the biased differential protection for different feeders with different kinds of loads. It naturally accommodates various control strategies such as P-Q control and V-f control. The parameter settings of the protection scheme are analyzed and calculated through a fast Fourier transform algorithm, and the stability of the control strategy is discussed by building a small signal model in MATLAB. Different operation modes such as the grid-connected mode, the islanding mode, and the transitions between these two modes are ensured. A Microgrid model is established in PSCAD and the analysis results show that a Microgrid system can be effectively protected against different faults such as the single phase to ground and the three phase faults in both the grid-connected and islanded operation modes.

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References

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