Hybrid Control and Protection Scheme for Inverter Dominated Microgrids

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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Cite this article

[IEEE Style]

X. Xu, H. Wen, L. Jiang, Y. Hu, "Hybrid Control and Protection Scheme for Inverter Dominated Microgrids," Journal of Power Electronics, vol. 17, no. 3, pp. 744-755, 2017. DOI: 10.6113/JPE.2019.17.3.744.

[ACM Style]

Xiaotong Xu, Huiqing Wen, Lin Jiang, and Yihua Hu. 2017. Hybrid Control and Protection Scheme for Inverter Dominated Microgrids. Journal of Power Electronics, 17, 3, (2017), 744-755. DOI: 10.6113/JPE.2019.17.3.744.