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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.
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.
결정질 PV 모듈의 string 구성에 따른 바이패스 다이오드 동작 특성
지양근(Yang-Geun Ji),공지현(Ji-Hyun kong),강기환(Gi-Hwan Kang),유권종(Gwon-Jong Yu),안형근(Hyung-gun Ahn),한득영(Deuk-Young Han) 대한전기학회 2010 전기학회논문지 Vol.59 No.12
Previous studies have been focused on the voltage of Bypass diode and Isc(Short Circuit Current) of the influenced solar cell. The Bypass diode starts working when it gets the reverse applied voltage. Previous studies have only concentrated on Isc of the influenced solar cell and Imp of PV module to explain the bypassing performance. PV module is usually working together with inverter having MPPT(Maximum Power Point Tracking) function for best performance. bypassing point is regulated by MPPT function of inverter. In this paper, simulation results of Bypass diode in PV module have been analyzed to represent the relationship of the bypassing point with the composition of PV module. From the results, the more cells are connected with each string, the earlier bypassing performance happens under the fixed number of strings. As diode groups increase or irradiation decreases, the bypassing performance starts fast.
PV모듈에서 태양전지와 Interconnect회로의 구성이 Ⅰ-Ⅴ특성과 Hot Spot에 미치는 영향
이진섭(Lee Jin-Seob),강기환(Kang Gi-Hwan),박지홍(Park Chi-Hong),유권종(Yu Gwon-Jong),안형근(Ahn Hyung-Gun),한득영(Han Deuk-Young) 한국태양에너지학회 2008 한국태양에너지학회 학술대회논문집 Vol.- No.-
In this paper, we analyze the Ⅰ-Ⅴ curve and hot-spot phenomenon caused by solar cells' serial and parallel connected circuit. The mis-match loss of parallel interconnection with low Isc string decrease lower than serially interconnected one and temperature caused by hot-spot does. Also, mis-match loss of parallel interconnection with low Vex: string increase more than serially interconnected one. The string having low Vex: happened hot-spot phenomenon when open circuit. The bad solar cell in string gives revere bias to good solar cell and make hot-spot phenomenon. If we consider the mis-match loss. when designing PV module and array, the efficiency of PV system might increase.
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%.