| Summary: | 碩士 === 國立中山大學 === 電機工程學系研究所 === 94 === The objective of this thesis is to maintain the stable operation of an industrial cogeneration system after transient disturbance caused by external utility system. Both dynamic stability and the transient stability of the power system are investigated. The dynamic stability analysis is to derive the stable frequency of the power system without causing the system frequency oscillation with the small amount of load change. On the other hand, the transient stability analysis will simulate the system response during system fault contingency to determine the system capability to restore the stable operation. Based on the transient stability analysis, the protection relay setting for both tie line tripping and load shedding are derived.
In order to confer the influence of the system stability with the industrial cogeneration system, we use the practical cogeneration system of China Steel Corporation (CSC) to analyze the transient stability of the whole system and dynamic stability of 700B/800B subsystem. Executing the load flow analysis of the CSC cogeneration system is solved by CYMSTAB software to derive the system prefault operating data. The system transient parameters are used to construct the system model. The system transient stability analysis is executed to solve the strategies of tie line tripping and the amount of load shedding to restore the system stability after fault contingency. Finally, the external fault at Fong-Nong substation in Tai-power is used to simulate and analyze the transient stability of CSC cogeneration system. Besides, the dynamic model of 700B/800B subsystem of the CSC cogeneration and selected adaptive control parameters are applied to simulate the dynamic response of system islanding operation.
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