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이흥재(Heung-Jae Lee),유원근(Won-Kun Yu),김균도(Kyun-Do Kim),임찬호(Chan-Ho Lim),김태균(Tae-Kyun Kim),신정훈(Jeong-Hoon Shin),남수철(Su-Chul Nam) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
최근 구미 선진국에서 빈발하고 있는 전압붕괴로 인한 대규모 정전사고의 확률이 점증하고 있어 전압관리가 현재 및 향후 전력계통의 문제점으로 대두되고 있으며, 이러한 문제들에 대한 대비가 시급한 실정이다. 이미 여러 선진국에서는 자국계통 특성에 적합한 전압, 무효전력 제어시스템을 개발하여 실계통에서 운용하고 있는 실정이다. 최근 우리나라에서도 전압안정도 측면에서 전압제어시스템의 필요성을 인식하고 전력 IT과제를 통하여 전압제어시스템을 개발하였다. 본 논문에서는 RTDS(Real Time Digital Simulator)를 통해 구축된 제주계통을 대상으로 개발된 지능형 전압제어시스템의 성능을 검증하였다.
이흥재(Heung_Jae Lee),유원근(Won-Kun Yu),김태균(Tae Kyun Kim),신정훈(Jeong Hoon Shin),남수철(Su Chul Nam) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
최근 국내계통에서도 중부하 상태로 안정도 한계근처에서 운용되고 있는 실정으로 이미 여러 선진국에서 경험한 전압붕괴로 인한 대규모 정전사태의 확률이 점점 증대되고 있다. 최근 우리나라에서도 전압안정도 측면에서 전압제어시스템의 필요성을 인식하고 이러한 문제를 해결하기 위해 전력IT과제를 통해 지능형 전압제어시스템을 개발하였다. 일반적으로 성공적인 지능형 시스템을 구현하기 위해서는 효과적인 탐색기법을 선정해야 한다. 본 논문에서는 지능형 전압제어시스템의 효과적인 동작을 위한 탐색기법을 선정하기 위해 전압제어문제를 상태공간 표현법을 사용하여 모델링 하였고 이에 적합한 탐색기법을 선정하였다.
자체기동발전원으로서 BESS의 활용가능성 분석 및 용량 산정에 관한 연구
김차년(Cha-Nyeon Kim),유원근(Won-Kun Yu),김헌태(Heon-Tae kim),이흥재(Heung-Jae Lee) 대한전기학회 2018 전기학회논문지 Vol.67 No.9
So far BESS(Battery Energy storage system) has been widely applied to power systems rapidly. Usually it has been used to regulate the renewable energy output and to adjust the power system frequency. In 2013, EPRI has reported a study of utilizing BESS to replace two black start generators of American Electric Power(AEP) that will be demolished. If the BESS can be used as a self-starting generator, it is possible to shorten the long-distance primary transmission line and shorten the restoration time because BESS is capable of the high-speed start and there is no restriction on the installation position. This paper presents a possibility of using BESS as a self-starting generator by using PSCAD/EMTDC in Korean power systems. Herein, the process to estimated the required capacity of BESS is also presented.
선로 긍장과 완충부하 투입량에 기반한 고조파 공진현상 분석에 관한 연구
이흥재(Heung Jae Lee),유원근(Won Kun Yu),박지만(Ji Man Park) 대한전기학회 2012 대한전기학회 학술대회 논문집 Vol.2012 No.5
During the restoration process of primary restorative transmission system, the over voltage may happen due to nonlinear interaction between the unloaded transformer and the transmission system. This over voltage is caused by harmonic resonance and can be prevented by damping loads that are connected before restoration process. But it is very difficult to predict the occurrence possibility of over voltage previously. This paper analyzes the relationship between the harmonic resonance and the amount of damping loads to prevent the harmonic resonance. This paper derives from the minimum amount of damping loads to prevent harmonic resonance while changing the length of primary restorative transmission line.
전력계통의 정전복구시 고조파 공진억제를 위한 완충부하투입량 예측에 관한 연구
이흥재(Heung-Jae Lee),유원근(Won-Kun Yu) 대한전기학회 2013 전기학회논문지 Vol.62 No.7
During the restoration process of primary restorative transmission system, some over voltages may happen due to nonlinear interaction between unloaded transformers and transmission systems. These over voltages caused by harmonic resonance can be suppressed by inserting damping loads before energizing transformers. But it is very difficult to predict the occurrence possibility of harmonic resonance and complex simulation must be repeated to estimate the sufficient damping loads. This paper presents a damping loads prediction system to prevent harmonic resonance. Detailed analysis of the relationship between harmonic resonance and the amount of damping loads is discussed. The prediction system is developed using a curve fitting and a neural network based on this relationship. A curve fitting used a Gaussian function based on non-linear least square method and multi-layer back-propagation neural network is applied. The system is applied to primary restorative transmission lines in korean power system and the result showed satisfactory performance.
이흥재(Heung-Jae Lee),유원근(Won-Kun Yu),왕인수(In-Soo Wang),강현재(Hyun-Jae Kang),신정훈(Jung-Hoon Shin) 대한전기학회 2012 전기학회논문지 Vol.61 No.7
As modern power systems become large and complicated, the automated voltage and reactive power control system is required in most developed countries due to the recent amazing progress of computer net works and information thechnology. So far the voltage control has been depend on human operator in korean power system. This paper presents an intelligent voltage control system based on sensitivity analysis and artificial intelligence technology. Detailed state space modeling technique is discussed and a new performance index is proposed to speed up the searching performance of the expert system. As the searching strategy is very important factor of the speed of expert system the least first search algorithm is applied using this performance index. The intelligent voltage control system is applied to the Jeju power system. As a result, case studies showed a promissing application of the intelligent voltage control system.