| Abstrakt: |
This paper proposes an approach for the optimal setting parameters of overcurrent relay (OCR) coordination considering multiple characteristic curves. The proposed approach considers time multiplier setting (TMS) and the relay characteristic curve setting (CS) as decision variables. As an inventiveness, the CS of OCR can be chosen as decision variables, instead of fixing a single type of curve for all relays that used in many existing works. The proposed approach allows three different curve types of IEC standard characteristic curves for combination results in the optimal protection coordination, including the standard inverse (SI) curve, very inverse (VI) curve, and extremely inverse (EI) curve. The proposed technique for solving this problem is hybrid particle swarm mixed integer linear programming (PSO-MILP). To show the effectiveness of the proposed approach, several tests were carried out using the standard IEC benchmark microgrid system. A comparison with previous existing methods illustrated that the proposed technique can absolutely decrease the total operating time of the OCR by around 34 percent for OM1, around 44 percent for OM2, and slightly decrease the total CTI of the test system. Therefore, the proposed approach is outstanding in finding lower the operating times and provides suitable operation of microgrid protections under different fault allocation and operating conditions. [ABSTRACT FROM AUTHOR] |
