SIMULATION AND CONTINGENCY ANALYSIS OF A DISTRIBUTED NETWORK IN IRAQ

Abstract

This paper presents the contingency analysis to study the impact of forced or planned outageson electrical distribution system. The mathematical modeling of contingency analysis includes; the loadflow analysis and the power restoration analysis. The power restoration is formulated as a constrainedmulti-objective optimization problem, based on the ranking search method. The method performs loadflow simulations and utilizes the analytical information obtained to maximize the amount of total powerrestored and to minimize the number of required switching operations.In this work the contingencyanalysis is based on the advanced CYMDIST software as a tool for the simulation of a distributionnetwork and performing the required analysis. CYMDIST software is practical and efficient analysissoftware used by many electrical companies worldwide as well as by the Iraqi ministry of electricity. Thedistribution network simulation and contingency analysis proposed in this paper were implemented onAl_Amereah 11 kV network which is a part of Baghdad city distribution network. The results show thatfull power restoration under contingency conditions after fault isolation without violating constraints wasachieved in three steps: optimal switching, addition of a feeder, and optimal capacitor placement.