PARTICLE SWARM OPTIMIZATION BASED OPTIMAL OPERATING TIME OF DIRECTIONAL OVERCURRENT RELAYS IN INTERCONNECTED NETWORK
Gaber El-Saady A. Taha Mostafa I.Saleh
industrial electrical power systems
Particle Swarm Optimization PSO method is used to coordinate directional over current relays (DOCRs) in an interconnected power system network. The essential feature of the PSO technique that the total operating time of all primary relays is minimized. A cost function is developed in terms of summation of operating times of the power system primary over current relays. The proposed cost function has some Constraints such as value of coordination time interval CTI (difference between operating times of back up and primary relays), the range of the time dial setting of the relay TDS and range of Pick up current of the relays. MATLAB code program is built to minimize the cost function under its constraints of standard IEEE 8-bus. The operating times of relays obtained by using the proposed PSO is compared with using Linear programming method. The validation of the results obtained from implementing PSO is done by running the ETAP program under same fault conditions to get the operating time of primary and backup relays .The results prove that the powerful and effectiveness of proposed PSO to get the minimum operating times of primary relays of power system
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