Abstract

A transmission line trip during a power swing may cause instability of a power system. It is necessary to recognize the power swing from fault based on stability boundary, the power swing blocking relays must be set to do that, power swing should be analyzed, a way of probability of occurrence of fault must be found, the critical condition under which the stability of a power system hasn’t been disturbed is recognized & finally the settings of the power swing relays are calculated. The main aim of this paper is to reduce the execution time of the process of finding of the Critical Clearing Time (CCT) using Programming Fast Method (PFM) and compare it with Bisection Method. In practice however, calculating the CCT is computationally inefficient and not desirable because the Bisection method is a tedious and inefficient process. A proposed method for finding the CCT of the power system at any direct fault or indirect-fault is more efficient method in the accuracy & solution time to calculate (CCT) in transient stability analysis. The results obtain by Bisection and proposed methods show that the proposed method reduce the execution time of the CPU about 8-10 times.In this paper the CCT was calculated for two power systems (single machine and the Iraq Super Grid at 10 locations in the Iraqi transmission line network) by using Bisection & proposed methods.MATLAB version 7 is used to implement several programs for the optimal execution time of the CPU time, with using PC4 and CPU speed 3 GHz.

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The article was added to IASJ on 2018-01-22

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