Power System Transient Stability Study And Enhancement Of Industrial Cogeneration System

Abstract

Service continuity of the electrical supply is a subject of utmost importance for an industrial cogeneration system. In order to achieve this goal the cogeneration system is tied to a bulk power supply to cover the power mismatch that occur between load and generation, but this also introduces stability problem .This research presents transient stability study and enhancement of industrial cogeneration system of Wonji-Showa Sugar Factory (WSSF)by tie line tripping at the CCT and under frequency load shedding .The system was modeled as One Machine Infinite Bus (OMIB) model and analyzed by a combination of time domain analysis and equal area criteria methods by MATLAB software in addition by selecting the total load , in plant generation and rate of change of frequency the minimum amount of load shedding is determined to maintain load and generation equilibrium and ensure continuity of power supply to the critical loads of the factory. finally the industrial cogeneration plant with its tie line is simulated on ETAP software to verify the accuracy of the determined CCT for successful transition from interconnection mode to islanding and the load shedding scheme by considering various contingencies and load generation. It is concluded that the WSSF power system transient stability can be enhanced by proper design of protective scheme.