• Journal of the Korean Solar Energy Society
• /
• v.29 no.4
• /
• pp.41-47
• /
• 2009

Wind/diesel hybrid operation can be one of the most effective option for electrical power production at a remote area such as Antarctica. The king Sejong station at Antarctica relies its power production on diesel engines and diesel oil is supplied every other year by ships. However, the oil transportation processes are liable to potential oil spillage caused by the floating ice around the King George island. The long-term storage of the oil at the station can also contaminate the surrounding soils. A l0kW wind turbine has been installed to save oil consumption and operated in connection with the diesel generators since 2006. The diesel engine that operated poorly during the first year of installation was replaced in 2008 to enhance power production an recent measurements indicate that both diesel power quality and the wind turbine availability have been dramatically improved by the replacement. This report discusses electrical power qualities of wind/diesel hybrid system operating at an isolated micro gird located in the king Sejong station. Our experience reveals that the similar technologies can be applied to domestic islands, for example, in the south sea.

• Nuclear Engineering and Technology
• /
• v.54 no.3
• /
• pp.877-887
• /
• 2022

A new reactor concept is described that directly couples a supercritical CO₂ (sCO₂) power cycle with a CO₂-cooled, heavy water moderated pressure tube core. This configuration attains the simplification and economic potential of past direct-cycle sCO₂ concepts, while also providing safety and power density benefits by using the moderator as a heat sink for decay heat removal. A 200 MWe design is described that heavily leverages existing commercial nuclear technologies, including reactor and moderator systems from Canadian CANDU reactors and fuels and materials from UK Advanced Gas-cooled Reactors (AGRs). Descriptions are provided of the power cycle, nuclear island systems, reactor core, and safety systems, and the results of safety analyses are shown illustrating the ability of the design to withstand large-break loss of coolant accidents. The resulting design attains high efficiency while employing considerably fewer systems than current light water reactors and advanced reactor technologies, illustrating its economic promise. Prospects for the design are discussed, including the ability to demonstrate its technologies in a small (~20 MWe) initial system, and avenues for further improvement of the design using advanced technologies.

• Journal of Electrical Engineering and Technology
• /
• v.11 no.3
• /
• pp.575-584
• /
• 2016

Considering the randomness and uncertainty of wind power, a reliability model of WTGs is established based on the combination of the Weibull distribution and the Markov chain. To analyze the failure mode quickly, we use the switch-section partitioning method. After defining the first-level load zone node, we can obtain the supply power sets of the first-level load zone nodes with each WTG. Based on the supply sets, we propose the dynamic division strategy of island operation. By adopting the fault analysis method with the attributes defined in the switch-section, we evaluate the reliability of the distribution network with WTGs using a sequential Monte Carlo simulation method. Finally, using the IEEE RBTS Bus6 test system, we demonstrate the efficacy of the proposed model and method by comparing different schemes to access the WTGs.

• Proceedings of the KIPE Conference
• /
• 2013.07a
• /
• pp.477-478
• /
• 2013

This paper presents the control mehtod of a photovoltaic(PV) hybrid generation with energy storage system(ESS). To stabilize power control between PV generation system with ESS and local load, the proposed control method performs grid-connected and islanding operations. Through the simulation results the theoretical analysis of proposed method is verified.

• Journal of Navigation and Port Research
• /
• v.36 no.6
• /
• pp.501-506
• /
• 2012

To serve basic data for the design of capacity and management of Distributed(or On-site) Power Generation System using renewable energies, this study measured the electric power consumption(hereafter abbreviated as EPC) of 5 families of fishing village located at island in southeastern area of Korea. The results are as following. The maximum monthly average EPC occurred in December or January. Although the total monthly EPC of H family is 2~3 times more than J family, individual monthly EPC of J family is 10~30 % more than H family. Hourly EPC pattern shows that the maximum EPC occurred between 20~24 o'clock in summer season, but it occurred between 18~24 o'clock in winter season. Compared to summer, the height of fluctuation through a day is small. And the EPC patterns of weekdays and weekend estimated as very similar.

• KEPCO Journal on Electric Power and Energy
• /
• v.7 no.2
• /
• pp.227-231
• /
• 2021

해저케이블 설치시 고비용, 민원발생, 환경오염 논란 등의 이슈가 많은 개착식 공법을 대신하여 현장에서 점차 친환경적 공법으로 자리 잡고 있는 비개착식 공법을 이용한 전력설비 건설이 활발하게 논의되고 있다. 본 논문에서는 이런 새로운 시도를 위해 필수적인 장거리 케이블 포설에 대한 새로운 방법을 현장실증을 통한 Data 확보 및 장비개발로 새롭게 제시하였다. 케이블 포설시 밀어주는 장비인 Pusher, 기존의 윈치와 Pusher 의 속도를 동기화시키는 장치 및 케이블을 꼬임없이 당기기 위한 다도체용회전형풀링아이 등을 개발하여 기존에 설치하였던 해저용특수케이블이 아닌 현재 일반적으로 사용중인 케이블의 포설가능 거리를 증가시켜 도서지역 전력공급 등을 위한 장거리케이블 포설에 비개착식 방식이 적용 가능 토록 새로운 케이블 포설공법을 개발하였다.

• 한국태양에너지학회:학술대회논문집
• /
• 2009.04a
• /
• pp.250-255
• /
• 2009

This study was analyzed the long term performance of the demonstration system for solar energy desalination in Jeju. we used a solar thermal system as heat source of the single-stage fresh water generator with plate-type heat exchangers and a photovoltaic power system as electric source for hydraulic pumps. The demonstration system was designed and installed at Jeju-island in 2006. The system was comprised of the desalination unit with daily fresh water capacity designed as $2m^3$ a $120m^2$ evacuated tubular solar collector to supply the heat, a $6m^3$ heat storage tank, and a 5kW photovoltaic power generation to supply the electricity of hydraulic pumps for the heat medium fluids. Through the operation during about 3 years, In a clear day more than $400W/m^2$, the daily fresh water showed to produce more than about 500liter, and from January, 2007 to March, 2009 for 3 years, solar irradiance daily averaged was measured $370W/m^2$, the daily fresh water yield showed that can be produced about 330liter.

• The Transactions of The Korean Institute of Electrical Engineers
• /
• v.61 no.9
• /
• pp.1232-1241
• /
• 2012

The ac side current of an high voltage direct current (HVDC) converter is characterized by highly non-sinusoidal waveform. If the harmonic current is allowed to flow in the connected ac system, it may cause unacceptable levels of distortion. Therefore, ac side filters are required as part of the total HVDC converter station, in order to reduce the harmonic distortion of the ac side current and voltage to acceptably low levels. The ac side filters are also employed to compensate network requested reactive power because HVDC converters also consume substantial reactive power. Among different types of filters, double-tuned filters have been widely utilized for HVDC system. This paper presents two design methods of double-tuned filter; equivalent method and parametric method. Using a parametric method, in particular the paper proposes a new design algorithm for a realistic system. Finally, the performance of the design algorithm is evaluated for a 80kV HVDC system in Jeju island with PSCAD/EMTDC program. The results cleary demonstrate the effectiveness of proposed design method in harmonics elimination and steady-state stability.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
• /
• v.18 no.5 s.120
• /
• pp.478-485
• /
• 2007

In this paper, an unequal 1:N Wilkinson power divider with adjustable dividing ratio is proposed. The proposed unequal power divider is composed of basic Wilkinson structure. It consists of rectangular-shaped defected ground structure (DGS), isolated island pattern in DGS, and varactor diodes of which capacitance depends on bias voltage. The characteristic impedance value of microstrip line having DGS goes up and down by controlling bias voltage for diodes, and consequently the power dividing ratio(N) is adjusted. The obtained N from measurement is $2.59{\sim}10.4$ which mean the proposed divider has adjustable unequal dividing ratio.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.37 no.8C
• /
• pp.663-669
• /
• 2012

To solve the energy problem and finding new growth engines, interest for the smart grid is increasing and related technologies are making great efforts to secure in the world. AMI (Advanced Metering Infrastructure) Among them is the first to be constructed and getting attention as a key component of smart grid. A fusion of various technologies in technology development and demonstration is underway on Jeju Island Smart Grid Demonstration Complex in Korea, and focusing on broadband power line communication technology infrastructure is actively underway in Korea Electric Power Corporation. AMI system using power line communication technology without building a separate communication lines are available for power supply lines, but communication is impossible in occurs because admission to the power company or the ideal infrastructure for communication is not considered. In this paper, we analyze the requirements to build AMI system using Binary CDMA and powerline communications technology, and design the basic communication protocol based on Binary CDMA, implement network management and relay feature. By doing so, ways to apply Ad-hoc Binary CDMA indigenous technology to the AMI system were derived, and could build a system to make use of Wired (PLC) and wireless (Binary CDMA) simultaneously.