PSCAD/EMTDC를 이용한 765kV 전력계통 외란 현상 연구
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The distortion phenomenon of 765kV power transmission system is studied in this thesis using PSCAD/EMTDC, a power system analysis program. Especially, the 765kV system with solidly earthed neutral transmission line is analyzed in detail. The efficiency and stability improvement of ultra high voltage system operation are researched and transient phenomenon is also investigated. Owing to the development of sensitive systems like microprocessor in modern industry, it is predicted that the attention to the quality of utility power will be rapidly increased, and the number of fault decreased due to the security improvement of power system. Ill factors, however, caused by natural disaster and distortion are still remaining, and they must be seriously considered by both power suppliers and the end users. In this paper, the influences that effect to ultra high voltage system by distortion are analyzed, and the improvement of stability in the system is researched. It is possible to detect voltage and current variations with the simulation result of Tangjin T/P 345kV system, Shinseosan S/S 765kV system, and Shinansung S/S 765kV system. When single line ground, which is the major fault occurring at utility power system, and three phase short circuit fault occur, serious current and voltage variation and distortion of neighboring systems are detected. The simulation results are given and discussed in detail.