Coordination of directional overcurrent relays for distribution system using particle swarm optimization

Author(s): Deepak Vyas , Praghnesh Bhatt ,Vipin Shukla
Pandit Deendayal Petroleum University, Raisan, Gandhinagar, Gujarat, India
International Journal of Smart Grid and Clean Energy, vol. 9, no. 2, March 2020: pp. 290-297
ISSN: 2315-4462 (Print)
ISSN: 2373-3594 (Online)
Digital Object Identifier: 10.12720/sgce.9.2.290-297

Abstract: The protection of electrical distribution network with multiple loops and bidirectional power flow needs optimal coordination of directional overcurrent relays (DOCRs). The DOCRs coordination is highly non-linear and largely constrained optimization problem where plug settings (PS) and time dial settings (TDS) of DOCRs are set as control variables. The objective function in this paper is based on minimizing the operating time of all primary DOCRs considering far-end and near-end fault approach. The optimization is performed with particle swarm optimization (PSO) for standard test systems of 3-bus, 4-bus and 6-bus and the results are compared with the existing methods of relay coordination reported in literature. The optimized PS and TDS for DOCRs has resulted in the least value of objective function along with proper coordination time interval for all test systems.

Keywords: Directional overcurrent relay coordination, coordination time interval, optimization, particle swarm optimization
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