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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean society for New and Renewable Energy
Journal Basic Information
Journal DOI :
The Korean Society for New and Renewable Energy
Editor in Chief :
Volume & Issues
Volume 5, Issue 4 - Dec 2009
Volume 5, Issue 3 - Sep 2009
Volume 5, Issue 2 - Jun 2009
Volume 5, Issue 1 - Mar 2009
Selecting the target year
Analysis of Dynamic Response of 1.5MW DFIG Wind Power Simulator with Real-grid Connection
Choy, Young-Do ; Jeon, Young-Soo ; Jeon, Dong-Hoon ; Shin, Jeong-Hoon ; Kim, Tae-Kyun ; Jeong, Byung-Chang ;
Journal of the Korean society for New and Renewable Energy, volume 5, issue 3, 2009, Pages 4~12
The effect of change in DFIG (doubly-fed wind power generator) rotating speed and active power on the grid was analyzed to understand the characteristics of wind power using the wind power simulator connected to the grid at Gochang Power Quality Test Center. Electric power quality improvement devices (DVR, STATCOM, SSTS) and electric power quality disturbance application devices for 22.9 kV grid are equipped at Gochang Power Quality Test Center. Induction motor and VVVF inverter were used to emulate the blade of a wind power generator, and a simulator for Cage wound induction generator and DFIG was developed. The trial line were assumed to be 20 km and 40 km in length, and variable wind speed pattern was set using wind speed data from Ducjeokdo to verify the power characteristics of the wind power generator according to rotating speed.
National Wind Atlas Database and Visualization Based on IDL
Kim, Hyun-Goo ; Lee, Sang-Woo ; Yi, Jong-Hyuck ; Lee, Soon-Hwan ;
Journal of the Korean society for New and Renewable Energy, volume 5, issue 3, 2009, Pages 13~21
National wind atlas of Korea requires effective database management because it has been constructed by 5-year long-term time-series numerical wind simulation. Therefore, database of the national wind map has been developed to increase data structure efficiency using IDL scientific programming language which has outstanding feature in mega-capacity numerical dataset. Visualization module also has been developed under IDL environment and it is anticipated to maximize post processing efficiency and applicability of the national wind map especially in the standing points of researchers and developers.
Power Supply for USN by Using SMD Type Solar Cell Array
Kim, Seong-Il ;
Journal of the Korean society for New and Renewable Energy, volume 5, issue 3, 2009, Pages 22~25
For increasing the output voltage, six SMD(surface mount device) type AlGaAs/GaAs solar cells were connected in series. The electrical properties of the array were measured and compared with one sun (100 mW/
) and indoor light (480 lux) conditions. Under one sun condition, output power was 21.57 mW and it was
under indoor light condition. Under the indoor light condition, the intensity of the light is very low compared to one sun condition. Thus the Voc(open circuit voltage) and Isc (short circuit current) of the sample under indoor light condition decreased very much compared to that of under the one sun condition. This kind of solar cell power supply can be used as a power source for ubiquitous sensor network (USN).
A Study on the Output Power Enhancement of GaAs/AlGaAs Solar Cell using Concentration Method
Lee, Dong-Ho ; Kim, Young-Hwan ; Song, Jin-Dong ; Kim, Seong-Il ;
Journal of the Korean society for New and Renewable Energy, volume 5, issue 3, 2009, Pages 26~31
Using MBE growth method, GaAs/AlGaAs solar cell structure was grown. Deposited electrodes are Au/Ni/Ge for n-type and Au/Pt/Ti for p-type electrodes were deposited by E-beam evaporator. Indoor light concentrators were devised and fabricated in order to concentrate artificial solar rays. Also mirror and prism and Fresnel lens concentration system with solar simulator were devised and fabricated. Results of solar cell characteristics were measured with shutting system which can control the amount of light. Maximum power density was 2.13 W/
and maximum concentration was 124 sun, when mirror with Fresnel lens was used at
of shutter hole.
Performance Evaluation of Ocean Small Hydropower Plant by Analyzing Water Level and Flow Rate of Circulating Water
Kang, Keum-Seok ; Kim, Ji-Young ; Ryu, Moo-Sung ;
Journal of the Korean society for New and Renewable Energy, volume 5, issue 3, 2009, Pages 32~39
The Samcheonpo ocean small hydropower plant (SHP) has a special feature of using marginal hydraulic head of circulating water system of fossil fuel power plant as a power source and having the characteristics of general hydropower generation and tidal power generation as well. Also, it contributes to reducing green house gases and developing clean energy source by recycling circulating water energy otherwise dissipated into the ocean. The efficiency of small hydropower plant is directly affected by effective head and flow rate of discharged water. Therefore, the efficiency characteristics of ocean hydropower plant are analyzed with the variation of water level and flow rate of discharged water, which is based on the accumulated operation data of the Samcheonpo hydropower plant. After the start of small hydropower plant operation, definite rise of water level was observed. As a result of flow pattern change from free flow to submerged flow, the instability of water surface in overall open channel is increased but it doesn't reach the extent of overflowing channel or having an effect on circulation system. Performance evaluation result shows that the generating power and efficiency of small hydropower exceeds design requirements in all conditions. Analysis results of CWP's water flow rate verify that the amount of flowing water is measured less and the highest efficiency of small hydropower plant is achieved when the effective head has its maximum value. In conclusion, efficiency curve derived from water flow rate considering tidal level shows the best fitting result with design criteria curve and it is verified that overall efficiency of hydropower system is satisfactory.
Feasibility Study on Thermal Power Plant Condenser Heat Recovery for District Heating and Fuel Line Preheating
Jung, Hoon ; Hwang, Gwang-Won ;
Journal of the Korean society for New and Renewable Energy, volume 5, issue 3, 2009, Pages 40~48
Recovered heat has been considered as a renewable energy in Europe since 2008 because its great effect on energy saving and carbon decreasing in plant process. Energy saving and decreasing green gas are critical issue today, so various technologies to save energy and decrease carbon dioxide in plant process have been applied to many industrial area. In this paper, the feasibility of condenser heat recovery by heat pump in power plant for district heating and fuel line preheating were reviewed by verifying energy (heat) balance and mass balance of power plant model. Some ways to compose proper system to recover heat of condenser are suggested and their possibilities are also reviewed. Limitations on heat recovery in power plant are also reviewed. The results are verified by calculating input/output energy based on actual performance test data of Taean Thermal Power Plant in Korea. There is noticeable improvement of plant performance in some cases which demand low temperature (<100 C) heat like distrcit heating, fuel line heating, and so forth.
The Human Capital Accumulation Effect of New and Renewable Energy Human Resource Development Programs
Lee, You-Ah ; Kim, Jin-Soo ; Heo, Eun-Nyeong ;
Journal of the Korean society for New and Renewable Energy, volume 5, issue 3, 2009, Pages 49~55
Human resource for the new and renewable energy technology is an important factor in the respect of the sustainable growth and energy security. In this paper, we focused on measuring the economic effect of human resource development on new and renewable energy development programs. The human capital accumulation model developed by Mincer (1974) was modified in terms of the rate of the researchers' investment in human capital. As a result of a empirical case study, the value of human capital was estimated by 102 million Korean won per year worth 18% of the project labor cost. In case of the assumption of 100% participation of researchers, the level of human capital accumulation increased to 914 million Korean won per year. These results imply that the new and renewable energy development programs has been successful, on the concept of learning by doing, in terms of providing the researchers with opportunities to accumulate human capital.