Investigations of short term and long term relaibility assessment for generation adequacy in power system

Abstract

The main and foremost important function of electrical power utility is to deliver economical, reliable and quality power to its consumer. The reliability evaluation of generation system is an important aspect in the operational and planning purposes for future system expansion in case of consumer satisfaction with electricity. This dissertation will particularly focus on evaluating the generation system adequacy reliability indices by analytical probabilistic assessment. Two case studies have been carried out for evaluation of long term and short term reliability on IEEE 30-bus system and Delhi Power System and to examine the normal and abnormal contingency states for each system with analytical method i.e., loss of load (LOLE) method and frequency and duration (FAD) method. Network violations in a contingency state are alleviated through real power load shedding. The two-state model with up and down states is used for all system components of system. The outage states with the large probability at a future time are selected using the proposed Fast Sorting Technique that selects the required number of states in descending order of probability. For the short term reliability assessment, time varying system operating conditions i.e. time dependent state probabilities of components have been considered and steady state probability of each component has considered for the long term reliability assessment.