Enhanced Combined Protection Scheme Using Dual Setting Directional Overcurrent and Distance Relays Considering Severe Line Contingencies

Abstract

An electrical power system must have an optimal protection system for enhanced reliability. Numerous studies have attempted to address issues with protection schemes, such as coordination constraint violations due to change in network configuration. Furthermore, in a few articles, the N-1 line contingency is considered without considering the line contingency selection criterion, resulting in a large number of constraints to deal with in the optimization problem. This paper proposes a new relay coordination scheme for dual setting directional overcurrent relay (DOCR) and distance relay based on the severity index of line outages, which is calculated by using an active and reactive performance index. The proposed protection strategy is improved with the help of an intelligent selection of the relay characteristics coefficient for dual setting DOCR along with the other relay settings. Another significant contribution is to provide a comparative analysis of standard and user-defined relay characteristics using genetic algorithm and grey wolf optimization algorithms. The modified IEEE-14 bus test system and IEEE-39 bus test system is used to validate the efficacy of the proposed protection scheme.

Keywords:

• active performance index
• distance relay
• grey wolf optimization
• line contingency
• overcurrent relay
• reactive performance index
• relay coordination

DISCLOSURE STATEMENT

No potential conflict of interest was reported by the author(s).

Additional information

Notes on contributors

Raghvendra Tiwari

Raghvendra Tiwari is a Research Scholar pursuing his PhD in Electrical Engineering from Motilal Nehru National Institute of Technology (MNNIT) Allahabad, Prayagraj (U.P), India. He graduated (2007) and post graduated (2013) in Electrical Engineering from National Institute of Technical Teachers Training and Research (NITTTR), Chandigarh (Haryana). His areas of interest include power system analysis, power system protection and artificial intelligence.

Ravindra Kumar Singh

Ravindra Kumar Singh is working as a Professor (H.A.G) in Department of Electrical Engineering, MNNIT Allahabad, Prayagraj (U.P.) India. He has published more than 60 papers in national and international journals and conferences. He has completed his PhD from IIT, Kanpur. His areas of interest include power electronics, power system protection, and power systems.

Niraj Kumar Choudhary

Niraj Kumar Choudhary is working as an Assistant Professor in Department of Electrical Engineering, MNNIT Allahabad, Prayagraj (U.P.) India. He has published more than 25 papers in national and international journals and conferences. He has completed his PhD from MNNIT Allahabad. His areas of interest include renewable energy and distributed generation based power system power system protection, and microgrid protection and smart grid, integration issues of DG in distribution system.