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Book ChapterDOI

Islanding of Energy System

01 Jan 2017-pp 217-231
TL;DR: Thermal Power Stations are considered for intentional islanding as they have the highest installed capacity in India and are essential for a higher national productivity and improvement in the social structure.
Abstract: The availability of electrical energy ensures development and progress of a country while its non-availability means economic stagnation or ‘backtracking’. The condition of ‘No Power’ is the costliest state and leads to social, economical and production loss. Power system blackout means inconvenience and hardship to society. Therefore, reliable and disturbance-free electric power supply is recognised as a key to societal progress throughout the world. Uninterrupted power supply is therefore essential for a higher national productivity and improvement in the social structure. Grid failure can occur due to a variety of causes such as: continued over-stressing, low frequency operation, increased load demand, peaking characteristics of the demand, ineffective load control, reduced level of security due to opening of interstate lines and violation of grid discipline. Separating healthy part in the system during fault at pre-determined points is called as islanding. This is to ensure supply of power to industries to reduce economic losses. In a complex system, intentional islanding becomes necessary to save healthy part to recover from the blackout. In this research work, Thermal Power Stations (TPS) are considered for intentional islanding as they have the highest installed capacity in India. Due to the effect of grid disturbance, a generating station usually experiences a shortfall of power for running its auxiliaries.
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Proceedings ArticleDOI
18 Mar 2001
TL;DR: Using proportionality and average assumptions, it is possible to calculate the specific generator contributions to different loads and the transmission system usage of different utilities.
Abstract: This paper presents a methodology using graph theory to determine the specific generator contributions to different loads and the transmission system usage of different utilities. Starting from a power load flow solution, the method first identifies the buses as load buses or generation buses by getting the net power. Then a directed graph is formed with vertices representing buses and the edges representing transmission lines. Second, it constructs all possible directed and rooted subgraphs of the system from its generator vertices. Notice that the union of these subgraphs is the original directed graph. Using proportionality and average assumptions, it is possible to calculate the specific generator contributions to different loads and the transmission system usage of different utilities.

25 citations