A New Modified Characteristic Equation for Optimal Coordination of Directional Overcurrent Relays

Neelakanteshwar Rao Battu, Surender Reddy Salkuti

Abstract


The integration of Distributed Generation (DG) into power systems is increasing to meet the requirements of the utility system. Renewable energy sources are given priority due to their clean energy and high consistency advantages. The integration of DG into the system creates a bi-directional flow of current. Directional-type overcurrent relays are usually used to the protect lines associated with bidirectional power flows. The installation of DGs, (especially, inverter-based) invites challenges to the existing protection schemes. A new modified characteristic equation-based approach is proposed in this paper to obtain the faster operational time of relays. The relay coordination scheme proposed in this paper is applied to an 8-bus test system integrated with the solar-based photovoltaic integrated distributed generator (PVIDG). A comparative analysis of the conventional and proposed approaches is conducted.

Keywords


Distributed Generation; Relay coordination; Relay Characteristics; Overcurrent relay; Coordination time interval.

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References


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DOI: http://doi.org/10.11591/ijict.v15i2.pp789-796

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