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결정질 실리콘 태양전지 모듈의 종류에 따른 동작 조건별 특성 비교에 관한 연구
박지홍(Park Chi-Hong),강기환(Kang Gi-Hwan),안형근(Ahn Hyungkeun),유권종(yu Gwon-Jong),한득영(Han Deuk-Young) 한국태양에너지학회 2008 한국태양에너지학회 학술대회논문집 Vol.- No.-
Photovoltaic (PV) modules output changes noticeable with variations in temperature and irradiance In general it is has been shown that a 1℃ increase in temperature results in a 0.5% drop in output. In this paper, seven PV nodule types are analyzed for variation in temperature and irradiance, and the resulting output characteristics examined. The 7 modules types utilized are as follows; 3 poly crystalline modules, 2 single crystalline modules, l back contact single crystalline module and 1 HIT module. 3 groups of experiments are then conducted on the nodules; tests with varying irradiance values, rests with module temperature varying under 25℃ and tests with module temperature varying over 25 ℃ The experiments results show that as temperature rises the follow is observed; Pmax decreases by 0.6%, Voc decreases by about 0.4%, and Isc increasing by between 0.03% ~ 0.08%. In addition, an irradiance decrease of 100 w/m2 translates into a 10% row in Pmax.
김승태,박지홍,강기환,화이티루,안형근,유권종,한득영,Kim, Seung-Tae,Park, Chi-Hong,Kang, Gi-Hwan,Lawrence, Waithiru C.K.,Ahn, Hyung-Keun,Yu, Gwon-Jong,Han, Deuk-Young 한국전기전자재료학회 2008 전기전자재료학회논문지 Vol.21 No.1
In this paper, an I-V characteristics of bypass diode has been studied by counting the shading effect in photovoltaic module. The shadow induces hot spot phenomenon in PV module due to the increase of resistance in the current path. Two different types of PV module with and without bypass diode were fabricated to expect maximum output power with an increasing shading rate of 5 % on the solar cell. Temperature distribution is also detected by shading the whole solar cell for the outdoor test. From the result, the bypass diode works properly over 60 % of shading per cell with constant output power. Maximum power generation in case of solar cell being totally shaded with bypass diode decreases 41.3 % compared with the one under STC(Standard Test Condition). On the other hand, the maximum output power of the module without bypass diode gradually decreases by showing hot spot phenomenon with the increase of shading ratio on the cell and finally indicates 95.5 % of power loss compared with the output under STC. Finally the module temperature measured increases around $10^{\circ}C$ higher than that under STC due to hot-spots which come from the condition without bypass diode. It has been therefore one of the main reasons for degrading the PV module and shortening the durability of the PV system.
PV모듈의 발전성능시험을 위한 Solar Simulator의 측정불확도 요인 분석
강기환,김경수,박지홍,유권종,안형근,한득영,Kang, Gi-Hwan,Kim, Kyung-Soo,Park, Chi-Hong,Yu, Gwon-Jong,Ahn, Hyung-Keun,Han, Deuk-Young 한국태양에너지학회 2007 한국태양에너지학회 논문집 Vol.27 No.1
In this paper, we analyzed the elements of measurement uncertainty on electrical performance test which are the most important things in photovoltaic module performance test. Repeating the performance test by 6 men, the measurement uncertainty could be calculated. In this experiment, Solar Simulator (A-Class pulse type) used for domestic certificate test of PV module is Pasan IIIb (Balval, Switzerland). The possible elements of the measurement uncertain that could effect electrical performance test of PV module are reference cell, spectrum correction, error from measurement repetition, test condition, stability and uniformity of artificial solar simulator. To find the measurement uncertainty, 6 men repeated the test by 10 times. And the results were that numerical average value was 124.44W and measurement uncertainty was $124.44W{\pm}0.36W$ with 95% confidence level for 125W PV module(KD-5125).
자연광 스펙트럼 분포에 의한 단결정 PV 모듈의 전기적 특성
홍종경,강기환,박지홍,정태희,류세환,화이티루 로렌스,안형근,한득영,Hong, Jong-Kyuong,Kang, Gi-Hwan,Park, Chi-Hong,Jung, Tae-Hee,Ryu, Se-Hwan,L, Waithiru,Ahn, Hyung-Keun,Han, Deuk-Young 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.3
Recently, characteristic research by the changes in the spectrum, one of the factors that influence analysis of maximum output power of PV module, has been studied. In this paper, a one-day intensity of solar irradiation, change of spectrums with time and electrical output for spectrums are analyzed. As a result, blue-rich wavelength compared with red-rich wavelength has large variation of solar irradiance with time, so we recognized that change of solar irradiance is dominated by variation of blue~rich wavelength. Also in same intensity of solar irradiance, electrical output in blue-rich wavelength was 3-8 % higher than one in red-rich wavelength.
발열 필름을 이용한 제설 기능 PV module & system 제작 및 특성평가
박은비(Eun Bee Park),조근영(Geun Yuoung Cho),조성배(Sung Bae Cho),김현준(Hyun Jun Kim),유정재(Jeong Jae Yu),박지홍(Chi Hong Park) 한국태양광발전학회 2016 Current Photovoltaic Research Vol.4 No.4
Piled snow upon PV module interferes with Photoelectric Effect process through photovoltaic directly. As a result of this phenomenon, its generation efficiencies keep decreasing or are stuck at zero power generating status. In addition, PV facilities have been installed on those places such as water surface, roof-top, and other isolated places, dealing with conditions of “Securing high REC weighted value”, “Difficulty of securing land” and so forth. Through this study, we are able to actualize the function of heating over PV modules when it snows. We adopted laminating method through heating film and modules, guaranteeing warranty more than for 25 years. Also we are trying remote control systemically, not by hardware control, to run parallel with automatic driving and monitoring system which enable to control operation time, insolation, amount of snowfall automatically. We applied analysis of actual proof to both snow removal PV system and general PV power system, and these led to bear power consumption analysis while snow-removing, and its comparison after finishing the task as “One stone, two birds.” In the long run, we could carry out economic analysis against snow removal system, and this helps to verify the most maximized control method for snow removal conditons on a basis of weather information. this study shall let prevent people from negligent accidents, and improve power generation problems as mentioned from the top. Ultimately, we expect to apply this system to heavy snowfall regions in winter season in spite of its limited system installaion in Korean territory, initially.
고온 및 고온고습 환경 내에서 ZnO:Al 투명전극의 열화가 CIGS 박막형 태양전지의 성능 저하에 미치는 영향
김도완,이동원,이희수,김승태,박지홍,김용남,Kim, Do-Wan,Lee, Dong-Won,Lee, Hee-Soo,Kim, Seung-Tae,Park, Chi-Hong,Kim, Yong-Nam 한국세라믹학회 2011 한국세라믹학회지 Vol.48 No.4
The influence of Al-doped ZnO (AZO) thin films degraded under high temperature and damp heat on the performance deterioration of Cu(In,Ga)$Se_2$ (CIGS) solar cells was investigated. CIGS solar cells with AZO/CdS/CIGS/Mo structure were prepared on glass substrate and exposed to high temperature ($85^{\circ}C$) and damp heat ($85^{\circ}C$/85% RH) for 1000 h. As-prepared CIGS solar cells had 64.91% in fill factor (FF) and 12.04% in conversion efficiency. After exposed to high temperature, CIGS solar cell had 59.14% in FF and 9.78% in efficiency, while after exposed to damp heat, it had 54.00% in FF and 8.78% in efficiency. AZO thin films in the deteriorated CIGS solar cells showed increases in resistivity up to 3.1 times and 4.4 times compared to their initial resistivity after 1000 h of high temperature and damp heat exposure, respectively. These results can be explained by the decreases in carrier concentration and mobility due to diffusion or adsorption of oxygen and moisture in AZO thin films. It can be inferred that decreases in FF and conversion efficiency were caused by an increase in series resistance, which resulted from an increase in resistivity of AZO thin films degraded under high temperature and damp heat.