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결정질 태양전지의 Micro-crack 패턴에 따른 PV모듈의 전기적 특성에 관한 연구
송영훈(Young-Hun Song),강기환(Gi-Hwan Kang),유권종(Gwon-Jong Yu),안형근(Hyung-Gun Ahn),한득영(Deuk-Young Han) 대한전기학회 2012 전기학회논문지 Vol.61 No.3
This study investigated the process of thermal-induced growth of micro-crack developed at the crystalline solar cell using EL image, determined the output characteristic according to the pattern of micro-crack, analyzed the I-V characteristic according to the pattern of crack growth, and predicted the output value using simulation. The purpose of this study was, therefore, to investigate the process of thermal-induced growth of micro-crack developed at the early stage of PV module completion using EL image, to analyze the resulting decrement of output and predict the output value using simulation. It was observed that the crack grew increasingly by the thermal condition, and accordingly the lowering of output was accelerated. The output values of crack patterns with various direction were predicted using simulation, resulting in close I-V curve with only around 4% of error rate. It is considered that it is possible to predict the electric characteristic of solar cell module using only pattern of micro-crack occurred at solar cell based on our results.
PV Module에서 태양 전지와 프레임 간격에 따른 전반사 효과와 전기적 특성 분석
송영훈(Young-Hun Song),최은지(Eun-Ji Choi),김경수(Kyung-Soo Kim),강기환(Gi-Hwan Kang),유권종(Gwon-Jong Yu),안형근(Hyung-Gun Ahn),한득영(Deuk-Young Han) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
We analyzed the total reflection effect by changing the gap of frames and solar cells in crystalline silicon solar modules. First, we verified the total reflection effect and its growth rate with varying the margin interval between frames and solar cells. We performed this experiment by analyzing the change in three modules with different sizes under same test. These results of this study provide fundamental and valuable information for PV module manufacturing industry. The detail description will be explained below.
Micro-cracks에 의한 PV 모듈의 전기적 특성 분석
송영훈(Song Young-Hun),지양근(Ji Yand-Geun),Kim Kyung-Soo,강기환(Kang Gi-Hwan),유권종(Yu Gwon-Jong),안형근(Ahn Hyung-Gun),한득영(Han Deuk-Young) 한국태양에너지학회 2011 한국태양에너지학회 학술대회논문집 Vol.2011 No.4
In this paper, we analyzed the electrical characteristics with Micro-cracks in Photovoltaic module. Micro cracks are increasing the breakage risk over the whole value chine from the wafer to the finished module, because the wafer or cell is exposed to mechanical stress. And The solar cells have to withstand the stress under outdoor operation in the finished module. Here the mechanical stress is induced by temperature changes and mechanical loads from wind and snow. So, we experimentally analyze the direct impact of micro-cracks on the module power and the consequences after artificial aging. The first step, we made micro-cracks in PV module by mechanical load test according to IEC 61215. Next, PV modules applied the thermal cycling test, because micro-cracks accelerated aging by thermal cycling test. according to IEC61215. Before every test, we checked output and EL image of PV module. As the result of first step, we detected little power loss(0.9%). But after thermal cycling test increased power loss about 3.2%.
결정질 태양전지 crack 패턴에 따른 전기적 특성 모델링
송영훈(Song, Young-Hun),강기환(Kang, Gi-Hwan),유권종(Yu, Gwon-Jong),안형근(Ahn, Hyung-Gun),한득영(Han, Deuk-Young) 한국태양에너지학회 2011 한국태양에너지학회 학술대회논문집 Vol.2011 No.11
In this paper,we analyzed the electrical characteristics with crack pattern in crystalline solar cell. crystalline solar cells with a thin substrate,even small shocks can be easily damaged. Before the module goes through many processes, because the solar cells are atrisk of a crack.[1]That occurred early in the PV module micro-crack is not easily detection by eye test or output test. Because the EL (Electroluminescence) device has been detected using. PV module is made by laminated of a variety of materials. By different properties of each material will affect the crack. For this reason, the crack will grow and affect the output. And We analyzed the three crack patterns in crystalline solar cell. A growth of cracks on crystalline solar cell was interpreted by analysing generated cracks on the PV modules. Based on this interpretation, an electrical output value was calculated by mathematical modeling on electrical output characteristic with each crack patterns.
PV 모듈에서 Back sheet의 반사 면적에 따른 전기적 출력 특성 분석
송영훈(Song Young-Hun),최은지(Choi Eun-Ji),김경수(Kim Kyung-Soo),강기환(Kang Gi-Hwan),유권종(Yu Gwon-Jong),안형근(Ahn Hyung-Gun),한득영(Han Deuk-Young) 한국태양에너지학회 2010 한국태양에너지학회 학술대회논문집 Vol.2010 No.11
In this paper, we analyzed the electrical characteristics of the total reflection by changing the gap of frames and solar cells, and between solar cells in crystalline silicon solar modules. First, the distance between frames and solar cells got controlled from 0 ㎜ to 10 ㎜ with 2 ㎜ increments by opacity sheet. The modules used in this study were 30 W and 220 W. The efficiency of modules was measured using the solar simulator at standard test conditions (STC). To analyze the effect in terms of the distance between solar cells, five modules were made with 2, 4, 6, 8, and 10mm gap. And then we measured the electrical characteristics of modules. As the result, the maximum power of PV modules improved as the gap of frame and solar cell, and between solar cells increased. However, the increase rate decreased and got saturated at 8㎜. It indicates that the 8mm gap might be the optimized condition in making the module in this experiment. These results provide fundamental and valuable information for PV module manufacturing industry.
신훈범,안형근,한득영,Shin, Hoon-Beom,Ahn, Hyung-Keun,Han, Deuk-Young 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.9
This paper explains the design and fabrication of an inverter for LCD backlight using a multilayer piezoelectric transformer. That inverter is operated by the burst dimming method whose dimming signal is controlled by the duty ratio of rectangular switching signal to a PWM controller. The brightness of CCFL's are investigated according to the various dimming signals, and when those CCFL's are turned on, the temperature distributions on the piezoelectric transformer and circuit components of the inverter are also investigated by a thermo-camera.