RELIABILITY EVALUATION WITH INTERMITTENT RENEWABLES IN A WIND GENERATION SYSTEM

Abstract

ABSTRACT newline Electrical Energy is the backbone of modern society. Electrical energy is generated using fossil fuel based power stations. Fossil fuels are depleting at significantly higher rate and the accumulation of such fuels in nature takes millions of years. Additionally, the fossil fuel based power stations are one of the main sources of environmental degradation, production of green-house gasses and damage to the protective ozone layers. The energy planners are working in two dimensions to rectify the problems: improving energy efficiency and replacing fossil fuel based power stations to renewable energy sources. The renewable energy sources are highly site specific. Numerous renewable energy sources are developed in recent past such as Wind, solar, tidal, biomass, geothermal etc. Mostly Solar and Wind energy generation systems are commercially used in several countries. newlineThe Reliability of electrical generation system has been considered important for the future system capacity so that installed capacity can provide adequate electricity when required. The reliability indices have been considered as the basis of planning for new investments in new generation capacities. Since the renewable energy is seen as a replacement in future electrical generation source therefore, system planners have to face the problem of integrating renewable resources namely wind, solar, wave and tidal energy which are intermittent in nature. The focus of this thesis is to analyze the effect of intermittent nature of wind generation on adequacy and reliability of the system. The effects of winds characteristics on the reliability of the system are also analyzed in this study. newline This study has particularly focused on calculating how intermittent wind generation contributes to the generation system adequacy and affects the system reliability. This work aims to analyse the capacity contribution of wind from different locations using a methodology and programme developed for this purpose. A generation system reliability model and calculation tool using MS Excel and visual basic editor based on the analytical method is used in this study. Data from the IEEE reliability test system 96 is used in the modeling and evaluation wind data obtained from various location of wind farms of Scotland, wind farms of Maharashtra, Lakshadweep island group Union Territory Of Lakshadweep newlineusing three selected approaches, two approaches based on retrospective analysis firm capacity method effective load carrying capability and effective capacity method and reliability curve method. These approaches modeled the wind data as load modifier and the capacity credits calculated have been compared with wind capacity credits calculated by wind capacity factor. Among all the methods used in this study, the effective capacity method gives value close to average of all the capacity credit and newlineis therefore recommended to be used for future generation capacity adequacy study with intermittent wind generation. newline newline