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기경현,강홍렬,김재현 순천대학교 2000 순천대학교 자연과학논문집 Vol.19 No.1
In the paper, the special characteristics of the system are emphasized regarding the nature of low frequency oscillations are discussed. This study reveal the emergence of an undamped swing mode involving the interaction of several machines and their controllers. Excitation systems with automatic voltage regulator(AVR) and governors and power system stabilizer(PSS) are installed locally within power plants and used for improvement of power system response to small and large disturbance. However an improperly tuned PSS and AVR could destabilize low frequency oscillation mode. This paper show that it is important to select the coefficients of AVR and PSS.
조류발전 이중여자발전기의 CRPWM 컨버터 히스테리리스 밴드 크기 최적화에 관한 연구
기경현(Kyunghyun Ki),이용식(Yongsik Lee),정성원(Sungwon Jeong),김재현(Jaehyeon Gim) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
As a result of environmental concerns, renewable energy systems are rapidly increasing and particularly tidal current is a potential source of energy. In accordance with a large-capacity trend, doubly-fed induction generator is applied such as wind farms and tidal systems. In this paper, Optimal hysteresis band amplitude of CRPWM Converter is determined for improving rotor current waveform and electrical quality.