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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).
강기환,유권종,안형근,한득영,Kang, Gi-Hwan,Yu, Gwon-Jong,Ahn, HyungKeun,Han, Deuk-Young 한국전기전자재료학회 2004 전기전자재료학회논문지 Vol.17 No.12
In this paper, degradation in field-aged PV modules including degradation of interconnect, discoloration of encapsulant and hot spot have been observed and analyzed. From the results, photovoltaic module installed for 6 years shows around 16 % drop of electrical properties due to the interconnect degradation and PV module passed 18 years has been found to drop of around 20 % mainly by the encapsulant discoloration. Furthermore the difference between low and high temperature of PV array at hot spot goes up to 3$0^{\circ}C$ and it leads to interconnect degradation. On the other hands, the temperature difference was observed to be around 15$^{\circ}C$ at the encapsulant discoloration spot of PV array.
외부환경적 가속시험에 의한 지붕일체형 태양전지모듈의 내구성 분석
강기환(Kang Gi-Hwan),김경수(Kim Kyung-Soo),유권종(Yu Gwon-Jong),이소미(Lee So-Mi),홍성민(Hong Sung-Min) 한국태양에너지학회 2006 한국태양에너지학회 학술대회논문집 Vol.- No.-
In this paper. we studied analysis of roof integrated photo voltaic module's durability with acceleration test. Two kinds of modules and ten samples were manufactured and tested by electrical and environmental acceleration test method. Through this experiment, we found that all modules have excellence in insulation resistance and maximum output power generation. But there was a great deformation in the external appearance by naked eye examination like bubble, humidity penetration and backsheet tearing. These might be caused by manufacturing process condition and lead degradation when installed outside. The detailed analysis is described in the following paper.
강기환(Kang Gi-Hwan),김경수(Kim Kyung-Soo),유권종(Yu Gwon-Jong),안형근(Ahn Hyung-Keun),한득영(Han Deuk-Young) 한국태양에너지학회 2009 한국태양에너지학회 논문집 Vol.29 No.2
In this experiment, we did sampling 6 kinds of photovoltaic modules and analyzed the discrepancy of measurement results between 1 laboratory and 4 PV makers to have performance repeatability at Standard Test Condition (STC) condition. From the KIER's results. Korea's standard test laboratory, other laboratory showed -10% measurement variation. The causes came from correction of reference cell, test condition and the state of skill. Form the comparison test, we analyzed the problems. But three PV maker reduced measurement variation, other one PV maker and one test laboratory didn't improve the problems of correction of reference cell, test condition and the state of skill. Also, High Efficiency Module had a big discrepancy of -10.0 ~ -6.2% among 3 laboratories which have a less than 10msec light pulse duration time. This made low spectrum response speed so the Fill Factor decreased maximum output power under 10msec light pulse duration time.
강기환(Gi-Hwan Kang),유권종(Gwon-Jong Yu),박경은(Kyung-Eun Park),김현일(Hyun-Il Kim) 한국태양에너지학회 2008 한국태양에너지학회 학술대회논문집 Vol.- No.-
Amid the booming research on new and renewable energy, the photovoltaic(PV) industry has been growing around the PV advanced countries such as Japan, Germany, Europe and USA. In recent years, China became a strong performer in the world PV market share, increasing solar cell production rapidly. Both world solar cell and module production and installation rose steadily in 2007 like recent bumper years. In 2007, the PV industry produced 4.28GW and the installations reached a record high of 2.83GW, representing growth of 60percent over the previous year.
PV 모듈용 EVA Sheet의 Curing 조건에 따른 Gel Content 특성
강기환(Kang Gi-Hwan),김경수(Kim Kyung-Soo),박경은(Park Kyung-Eun),김현일(Kim Hyun-Il),유권종(Yu Kwon-Jong) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
In this paper, we analyzed the effect of EVA Sheet Gel Content depending on curing condition for photovoltaic module. Gel Content was measured by manufacturing Glass/EVA Sheet/Back Sheet scheme at several curing temperature and curing time. And the surface analysis of EVA Sheet depending on process condition could be observed using SEM(Scanning Electron Microscope). Through this experiment, we could confirm that there are differences on Gel Content of EVA Sheet and surface configuration depending on curing temperature and curing time. To find out the optical characteristic dependency on curing condition, Glass/EVA Sheet/Glass scheme was fabricated. The optical transmittance of EVA Sheet at visible wavelength was enhanced 5% when compared to Glass/Glass scheme. And the transmittance of 130 ℃/4min, 110℃/4min, 110℃/6min process condition was higher at ultraviolet wavelength range. These curing conditions could be regarded as the best process for suppression the discoloration speed of EVA Sheet under UV light.