• Proceedings of the KIEE Conference
• /
• 2007.07a
• /
• pp.1245-1246
• /
• 2007

In present, as the various PV system have been installed and disseminated, research and development of photovoltaic(PV) system is the most important issues to establish usefulness of design, installation, supervision and maintenance of PV system with performance improvement. This paper presents evaluation and analysis method for estimating performance and losses of PV system and components using monitoring data.

• Proceedings of the KIEE Conference
• /
• 2005.07b
• /
• pp.1364-1367
• /
• 2005

In this paper, a novel prototype topology of soft switching PWM controlled high frequency AC power conversion circuit without DC voltage smoothing chemical capacitor filter link from the voltage grid of utility frequency AC power supply source with 60Hz-100V or 60Hz-200V is proposed and introduced for innovative consumer induction heating(IH) boiler applications as hot water producer, steamer and super heated vapor steamer.

• Proceedings of the KIEE Conference
• /
• 2005.07b
• /
• pp.1768-1770
• /
• 2005

본 논문에서는 태양광 발전 시스템의 계통 연계를 위한 실증 시스템 개발 연구의 일부로 진행되고 있는 태양 전지 어레이의 모델링과 해석 결과에 대한 내용을 제시하고자 한다. 태양광 발전 시스템은 태양광 에너지를 전기 에너지를 변화하여 주는 태양 전지판과 발전된 전기 에너지를 전력 계통에 연계하여 주는 전력변환 장치(PCS)로 구성되어 있다. 모델링에 사용된 주요 파라미터는 현재 연구원에서 보유하고 있는 실제 태양광 발전시스템을 기준으로 하였다. 개발된 모델을 이용하여 시스템의 주요 특성 곡선을 추출하였으며 기존의 연구 결과와 비교하여 제안된 모델의 타당성을 검증하였다. 본 논문에서 제시된 태양광 시스템 모델은 향후 전체 시스템의 동적 응답에 대한 해석 및 계통 연계 운전 검토를 위한 연구에 적용될 계획이다.

• Proceedings of the KIEE Conference
• /
• 2005.07b
• /
• pp.1784-1787
• /
• 2005

This paper presents the development and testing of a power conditioning system(PCS) for application to a 100kW Molten Carbonate Fuel Cell(MCFC) generation system. The MCFC generation system is a part of a four year government funded research project that began in 2001. This paper presents the results of various tests and performance verification of the 100kW PCS using a DC power system that simulates the DC output of the MCFC fuel cell. Performance of the DC/DC, DC/AC converters were verified, and basic control functions such as grid connection, protection and characteristics of each components were tested. The tests were performed under light load and rated load conditions to verify the operation efficiency, power quality effects, and stability of the PCS.

• Proceedings of the KIEE Conference
• /
• 2005.07b
• /
• pp.1687-1689
• /
• 2005

In this paper, novel concept of a photovoltaic(PV) power generation system adding the function of active filter(AF) is proposed. Even PV power generation system can be treated to a harmonics source for the power distribution system, it is necessary that the function of AF system in grid connected PV power generation system. Active Filters intended for harmonic solutions are expending their functions from harmonic compensation of nonlinear loads into harmonic isolation between utilities and consumer, and harmonic damping throughout power distribution system. So, the PV system combined the function of AF system can be usefully applied in power distribution system. Here, the control strategy of PV-AF system is introduced.

• Proceedings of the KIEE Conference
• /
• 2005.07b
• /
• pp.1788-1790
• /
• 2005

In this paper, an operating characteristics of a 50 kW gird-connected photovoltaic(PV) power system was analysed from 2000 to 2004. The construction of the PV system includes a 3-phase inverter for grid connection, PV module, distribution box, and data monitoring system. The major results of the demonstration test of the 50 kW class gird-connected PV system showed that efficiency of PV system was 11.13%, and the conversion efficiency of the inverter was 92% at a 50% load.

• Proceedings of the KIEE Conference
• /
• 2005.07b
• /
• pp.1696-1698
• /
• 2005

In this paper, a model that can be used to represent all types of variable speed wind turbines in power system simulations is presented. Wind turbine characteristic equation of a wind turbine is implemented in the RTDS, and the real data of weather conditions are interfaced to the RTDS for the purpose of real time simulation of grid-connection wind power system. The outcomes of the simulation demonstrate the effectiveness of the proposed simulation scheme in this paper. The results show that the cost effective verifying for the efficiency and stability of WPGS.

• Proceedings of the KIEE Conference
• /
• 2004.11b
• /
• pp.78-82
• /
• 2004

This paper suggests the power system reliability evaluation fur transmission lines planning in composite power systems. In recent the importance and necessity of some studies on reliability evaluation of grid comes from the recent black-out accidents occurred in the world. Since probabilistic criterion can reflect recognize the probabilistic nature of system components, the application of probabilistic criterion has received a lot of attention. This paper introduces features and operation modes of the Transmission Reliability Evaluation fur Large-Scale Systems(TRELSS) Version 6.2, a program made in EPRI, for assessing reliability indices of composite power system. The characteristics of the TRELSS program are illustrated by the case studies using the KEPCO system.

• Proceedings of the Korean Information Science Society Conference
• /
• 2003.04d
• /
• pp.148-150
• /
• 2003

지리적으로 분산된 유휴 자원들을 통합하여, 하나의 메타 컴퓨팅 환경을 제공하기 위한 연구가 활발히 진행되고 있다. 대표적인 것으로 그리드를 들 수 있는데, 통신망에 연결된 슈퍼컴퓨터. 클러스터 워크스테이션, 대용량 저장장치 및 측정장치 등과 같은 자원을 공유하는 더 강력한 가상의 컴퓨팅 환경이다. 그리드의 세부분야 중 어카운팅 분야는 다른 분야와는 달리 아직 그 연구가 미미한 상태이고 그리드의 특성상 기존의 플랫폼에서 취해왔던 방식이 그대로 적용되기 어려운 점이 있다. 본 논문에서는 그리드 환경에 적합하도록 분산 어카운팅을 제공하고 각 사이트의 자율성을 보장할 수 있는 어카운팅 플랫폼을 설계하였다.

• Proceedings of the KIEE Conference
• /
• summer
• /
• pp.257-259
• /
• 2004

This paper proposes the identification method for the faulted feeder, where it identify whether the faulted feeder is the DG-connected feeder or the neighboring feeder (but sharing the same bus of the substation). In general, DG has to be disconnected from the grid when the fault occurs on the interconnected distribution feeder as soon as possible. However, the faults occured on the neghboring feeder would mistakenly cause the disconnection of the DG. For reliable operation of DG, DG should be sustained at the fault occurred on neighboring distribution feeders. The proposed identification method utilizes the impedance monitored from the DG and examines the coordination of overcurrent relay of the distribution system. This paper describes how the proposed method to identify the faulted feeder and how the method can be utilized.