Abstract
The relay optimization expresses quite a challenge for smooth and optimal operation of power system networks. The relay optimization is formulated as a mixed integer non-linear problem and is highly constrained. Furthermore, a reliable relaying system must be able to detect and isolate the faulted portion in a timely manner. Therefore, it is necessary to find optimal parameters for relay settings to be able to respond in a timely way to the encountered fault and at the same time keep in consideration the operational and coordination constraints. This paper proposes modified Harris hawk optimization (MHHO), which is based on the intelligent preying tactics of Harris hawks and the improvement of intended modifications, crowding distance and roulette wheel selection. The proposed algorithm has been tested on IEEE 8 and 15-bus systems, using MATLAB programming. The test systems are the distribution networks covering the medium level voltage for consideration. The simulation results verified the success of MHHO to find optimal settings for the relays. For IEEE 8-bus system, MHHO was able to give 35.45% improvement in the results in comparison to other algorithms. Furthermore, for the IEEE 15-bus system, MHHO showed 24.09% improvement on average. The comparison of the results obtained by MHHO with the other state-of-the-art algorithms proved that it is the strong candidate for optimization of the relay coordination problem.
Highlights
Power system protection is critically important for uninterrupted supply to healthy portion systems and timely fault isolation
This paper presents modified Harris hawk optimization (MHHO), which is developed from the recently proposed Harris hawk optimization algorithm
For directional overcurrent relays (DOCR) coordination, the penalty In the case of violations, this value is added to an objecTtioveenfusnucretiothna[t4n5o]. relay go out of bounds and defined constraints, a penalty function is added to the objective function of thenalgorithmk
Summary
Power system protection is critically important for uninterrupted supply to healthy portion systems and timely fault isolation. Overcurrent relays (OCR) are widely used in protection schema as a main protection as well as backup protection. Backup relays are supposed to be functional after a time margin for operations if primary relays fail to achieve the tripping. This time margin in referred to as the coordination time interval ‘CTI’ [3]. The optimization of relay operation schema is carried out by ensuring proper coordination of relays while achieving selectivity as well as fast isolation while fulfilling the performance and coordination constraints [5,6]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
