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http://dx.doi.org/10.6113/JPE.2017.17.3.744

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)
Publication Information
Journal of Power Electronics / v.17, no.3, 2017 , pp. 744-755 More about this Journal
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.
Keywords
Biased differential protection; Distributed generators; Grid-connected mode; Inverse-time overcurrent protection; Islanded mode; Microgrid protection;
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Times Cited By KSCI : 4  (Citation Analysis)
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