• 신재생에너지
• /
• 제6권4호
• /
• pp.15-29
• /
• 2010

In order to make the best choice for $CO_2$ abatement using renewable energy technologies, it is important to be able to adapt these technologies on the basis of their sustainability, which may include a variety of environmental indicators. This study examined the comparative sustainability of renewable technologies in terms of their life cycle $CO_2$ emissions and embodied energy, using life cycle analysis. The models developed were based on case studies of bioenergy pilot plant in P city of Kyungki province. Final results were total emission of $CO_2$ in Pocheonsi is 670,041 $tCO_2$, around 500,877 $tCO_2$ for electricity and for heat generation, and 169,164 $tCO_2$ for transportation. When used $1,984\;m^3$/day of waste (pig manure etc.) and operated CHP with wood chips of 144,664 ton/year, the $CO_2$ emission in P city was left as is an emission of 449,274 $tCO_2$ and an abatement of $CO_2$ in this region was increased by 32.9%.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2005년도 제36회 하계학술대회 논문집 A
• /
• pp.143-145
• /
• 2005

There has been increasing interest in the renewable energies. Wind energy is worldwide number one renewable energy from the installed capacity viewpoint. Most of the power systems utilizing wind energy are connected to other large systems. In such integrated systems, frequency control is not big issue. Rut the situation is different in isolated systems like Korean power system. It is important to assess appropriate capacity of wind power for our system, as it affects the system operation and control strategy. In this paper we made it clear the relationship among generator inertias, governor droop, system damping and wind energy capacity.

• 한국신재생에너지학회:학술대회논문집
• /
• 한국신재생에너지학회 2006년도 추계학술대회
• /
• pp.230-233
• /
• 2006

Small hydropower, one of renewable energies, is the clean energy which emits no carbonic acid gas. It has noting to do with global warming. It is a useful resource to contribute to the dispersion of power. Because of ballooning oil prices, the need for small hydropower is increasing. Recently small hydropower development using dams, small rivers, reservoirs, water pipes, sewage treatment plants and cool ing water of thermal power plants is conducting. By suggesting the strategy of the enlargement revitalization of small hydropower development, we hope to waken the people's interest in the small hydropower

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2000년도 하계학술대회 논문집 A
• /
• pp.573-575
• /
• 2000

For the greenhouse gas emissions' reduction of fossil fuel, the energy policy on promotion of alternative energy should be implemented. Accordingly, national policies on the development and promotion of alternative energy were made and related laws and regulations are being made and comprehensive plans should be followed. The policies and strategies for promoting the renewable energy have been insufficient in comparison with that of the developed countries. This paper suggests the optimal subsidy level for Photovoltaic and Wind Power.

• ETRI Journal
• /
• 제44권4호
• /
• pp.695-707
• /
• 2022

As for the insufficient nature of the fossil fuel resources, the renewable energies as alternative fuels are imperative and highly heeded. To deliver the required electric power to the industrial and domestic consumers from DC renewable energy sources like fuel cell (FC), the power converter operates as an adjustable interface device. This paper suggests a new boost structure to provide the required voltage with wide range gain for FC power source. The proposed structure based on the boost converter and the quazi network, the so-called SBQN, can effectively enhance the FC functionality against its high operational sensitivity to experience low current ripple and also propagate voltage and current with low stress across its semiconductors. Furthermore, the switching power losses have been decreased to make this structure more durable. A full operational analysis of the proposed SBQN and its advantages over the conventional and famous structures has been compared and explained. Furthermore, a prototype of the single-phase converter has been constructed and tested in the laboratory.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
• /
• 제5B권2호
• /
• pp.97-102
• /
• 2005

Because of the limited fossil resources and the need to avoid emissions and toxic waste the future energy supply will be based on a large portion of renewable energies: wind-, solar-, biomass- and geothermal energy. Focus is on the utilization of wind energy coming from onshore- and offshore-sites. Generating electricity from wind is state of the art and feeding large amounts of wind power into the electrical grid will create some additional problems. Suggestions concerning energy storage will be made and the problem of power quality is discussed.

• 진공이야기
• /
• 제3권2호
• /
• pp.4-10
• /
• 2016

Photovoltaic technology has been intensively developed as one of the most powerful renewable energies, replacing a fossil fuel such as coal and petroleum. Every country in the world has emphasized on development of photovoltaic technology and our government has invested heavily in low cost and high efficiency. Korea institute of industrial technology (KITECH) has lastingly constructed PV R&D infra for development of cost-effective and high efficiency solar cells as well as support of commercialization in PV's small and medium enterprises. In this paper, we introduce the next generation PV R&D and infra in KITECH.

• 태양에너지
• /
• 제11권1호
• /
• pp.92-97
• /
• 1991

화석에너지로 부터 방출되는 온실효과 가스와 지구 온난화 현상에 대하여 조사하였다. 세계의 사회경제활동과정에서 가속화가 예상되는 에너지 수요증가에 대응하기 위하여, 온실가스 배출을 감소시킬 화석에너지 이용시스템과 핵에너지와 청정자원인 재생에너지를 포함한 종합적인 에너지공급시스템개념에 대하여 고찰하였다.

• 신재생에너지
• /
• 제5권2호
• /
• pp.3-8
• /
• 2009

Tidal current power system is one of ocean renewable energies that can minimize the environmental impact with many advantages compared to other energy sources. Not like others, the produced energy can be precisely predicted without weather conditions and also the operation rate is very high. To convert the current into power, the first device encountered to the incoming flow is the rotor that can transform into rotational energy. The performance of rotor can be determined by various design parameters including numbers of blade, sectional shape, diameter, and etc. The stream lines near the rotating rotor is very complex and the interference effects around the system is also difficult to predict. The paper introduces the experiment of rotor performance and also the fundamental study on the characteristics of three different rotors and flow near the rotor by CFD.

• 대한공간정보학회지
• /
• 제18권1호
• /
• pp.31-39
• /
• 2010

석유파동이후 신재생에너지의 중요성이 대두되고 현재에 들어 저탄소 녹색성장으로 다시금 그 중요성은 커지고 있다. 본 논문에서는 신재생 에너지 중 가장 현실적인 대안으로 받아들여지고 있는 풍력에너지에 대하여 강원지방 기상청의 2008년 데이터 이용하여 풍속지도를 제작 하였다. 강원도 월별 평균 풍속과 최대풍속지도를 제작하였으며, 기상자료에 여러 가지 보간법을 적용하고 방법에 따른 차이를 확인하였다. 강원도 지역의 특수한 지형적, 기후적 특성이 반영된 풍속지도는 풍력 단지 입지분석에 활용성이 높을 것으로 기대된다.