Hybrid control and protection scheme for inverter dominated microgrids

Xiaotong Xu, Huiqing Wen*, Lin Jiang, Yihua Hu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)744-755
Number of pages12
JournalJournal of Power Electronics
Issue number3
Publication statusPublished - 2017


  • Biased differential protection
  • Distributed generators
  • Grid-connected mode
  • Inverse-time overcurrent protection
  • Islanded mode
  • Microgrid protection


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