An Effective Coordination Setting for Directional Overcurrent Relays Using Modified Harris Hawk Optimization

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.

Optimal overcurrent relay coordination: Balancing costs, time performance and generator placement in fault current limiter optimization

“…Here the R Pri denotes the number of primary relays and the T opi is the operation time of each relay. The operation time of the DOCRs is mathematically defined as [19]:…”

“…The CTI value is chosen to be 0.2 s [14,19,29]. Furthermore, 0.05 and 1.1 have been set as the lower and upper boundaries of TMS, respectively.…”

“…The Harris Hawk optimization (MHHO) is introduced in ref. [19] in a modified form. To shorten the total operation time of DOCRs and confirm the efficacy of the suggested MHHO, the goal is to find the optimal TMS and PS settings that satisfy the authorized limits.…”

Recent Advances in Harris Hawks Optimization: A Comparative Study and Applications

“…They applied it for proton exchange membrance for modeling of fuel cells. Moreover, Irfan et al [140] proposed a modified HHO (MHHO) by using crowding distance and roulette wheel selection. They tested it using the IEEE 8 and 15 bus systems.…”

An Improved Technique of Hybridization of PSO for the Optimal Coordination of Directional Overcurrent Protection Relays of IEEE Bus System

“…In general, a DOPR is dependent upon many factors such as the plug setting (PS), time multiplier setting (TMS), coordination time interval (CTI), current transformer ratio (CTR) primary fault current, and secondary fault current, etc. To improve reliability in electrical systems, other relays are integrated, which serve as a second line of protection in the event of a failure of the first protection, and to ensure the stability of the power system, an alternate protection circuit must be placed in case the first one does not work properly [2,3]. The reliability of the operating time of a DOPR depends on two parameters that are the plug setting (PS) and time multiplier setting (TMS).…”