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전력시스템의 전압변동 현상과 최적 전압보상 방안에 관한 연구
김승환,유인근 창원대학교 산업기술연구소 2001 産技硏論文集 Vol.15 No.-
In resent years, electric power quality has become an important issue in power systems. A rapid development of high technology society encompassing sensitive loads raise the increasing dependence of higher quality electric power, and consumers request the high reliability in electric power than ever before. Consumers wanted mainly the reduction of duration of voltage variation in the past. Generally, power quality is voltage, frequency, reliability(outage) etc. The sources and characteristics for voltage variation of power system and the effects for electric equipment of voltage variation are analized in this paper. The voltage variation and compensation countermeasures of west Kyung-nam province in KEPCO system have been simulated using PSS/e. The voltage drop is measured in the case of SLGF(single line ground fault) and TPSCF(three phase short circuit fault), at 345kV transmission line and bus, 154kV, 23kV bus and 6.6kV bus of industry. The voltage compensation characteristic of Generator, transformer and Static condenser, and the voltage compensation limits value of the compensation methods are observed, and the results of measurement at the condition of normal and abnormal(the status of 1 line open) of the 2 lines radial power systems are also analyzed. In the abnormal power system, the adaption of S.V.C, with method of high speed and continuous controls is simulated for voltage compensation. It is shown that the S.V.C is the best voltage compensation method in loop power system or 2 lines radial system.