Abstract This study investigates an‎d analyzes the resilience factor in improving the performance of protection systems for transmission networks. The main objective of this research is to develop an objective function to enhance the coordination of relay protection while accounting for the resilience factor. To this end, two objective functions for coordinating overcurrent relays by incorporating the resilience factor have been proposed. The newly proposed objective functions in this thesis were implemented on the IEEE 14-bus system in PowerFactory version 15.1 (DIgSILENT) an‎d its DPL programming language. These objective functions were optimized using a genetic optimization algorithm implemented in MATLAB. In this thesis, both proposed objective functions are analyzed under two different scenarios. The first objective function includes the operating time of the main relay an‎d the backup relay, as well as the total time difference of relay pairs an‎d the fault/current error factor. The second proposed objective function includes the square of the operating times of the main relays along with the error/fault factors. The resilience is examined in the context of a network experiencing a fault, during which the network must maintain its resilience. This is demonstrated in the thesis by the ran‎dom outage of a line. In this project, two scenarios are proposed to eva‎luate the response times of the main an‎d backup relays in protective systems. The aim is to compare the time-response performance of these relays under two conditions: (i) ignoring the resilience factor, an‎d (ii) applying the resilience factor. Both scenarios are defined as two proposed objective functions so that system stability can be measured quantitatively. Results the application of the developed objective functions to the test network shows that incorporating the resilience factor leads to protection coordination that is more challenged than before applying the factor. In other words, the results indicate that neglecting the resilience factor in the protective coordination of transmission networks degrades system performance, increases protection miscoordination, an‎d reduces the overall security level of the network.

امير حسيني , حامد جعفري

حميدرضا عبدالمحمدي , احسان آزاد فارساني