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PV모듈의 음영 상태 및 바이패스 다이오드 단락 고장 특성 분석
고석환(Ko Suk-Whan),주영철(Ju Young-Chul),소정훈(So Jung-Hun),황혜미(Hwang Hye-Mi),정영석(Jung Young-Seok),강기환(Kang Gi-Hwan) 한국태양에너지학회 2016 한국태양에너지학회 논문집 Vol.36 No.4
A bypass diode is connected in parallel to solar cells with opposite polarity. The advantage of using the bypass diode is circumvented a destructive efforts of hot-spot heating in the photovoltaic(PV) module. In addition, it is possible to reduce a energy loss under the partial shading on the PV module. This paper presents a characteristic of photovoltaic module under partial shading condition and with defective bypass diode by using the experimental data. The results of field testing for each photovoltaic modules, when photovoltaic system which is connected power grid is operating, the inner junction-box temperature of shading photovoltaic module is high 5℃ because of difference of flowing current through into bypass diode. And incase of not operating photovoltaic system, the inner junction-box temperature of module with defective bypass diode is greatly higher than partial shading PV module.
태양전지모듈 고장 진단 알고리즘을 적용한 모니터링시스템
고석환(Ko Suk-Whan),소정훈(So Jung-Hun),황혜미(Hwang Hye-Mi),주영철(Ju Young-Chul),송형준(Song Hyung-June),신우균(Shin Woo-Gyun),강기환(Kang Gi-Hwan),최정내(Choi Jung-Rae),강인철(Kang In-Chul) 한국태양에너지학회 2018 한국태양에너지학회 논문집 Vol.38 No.3
The objects of PV (Photovoltaic) monitoring system is to reduce the loss of system and operation and maintenance costs. In case of PV plants with configured of centralized inverter type, only 1 PV module might be caused a large loss in the PV plant. For this reason, the monitoring technology of PV module-level that find out the location of the fault module and reduce the system losses is interested. In this paper, a fault diagnosis algorithm are proposed using thermal and electrical characteristics of PV modules under failure. In addition, the monitoring system applied with proposed algorithm was constructed. The wireless sensor using LoRa chip was designed to be able to connect with IoT device in the future. The characteristics of PV module by shading is not failure but it is treated as a temporary failure. In the monitoring system, it is possible to diagnose whether or not failure of bypass diode inside the junction box. The fault diagnosis algorithm are developed on considering a situation such as communication error of wireless sensor and empirical performance evaluation are currently conducting.
전도성 페이스트 도포량 변화에 따른 결정질 태양광 모듈의 전기적 특성에 대한 영향성 분석
김용성,임종록,신우균,고석환,주영철,황혜미,장효식,강기환,Kim, Yong Sung,Lim, Jong Rok,Shin, Woo Gyun,Ko, Suk-Whan,Ju, Young-Chul,Hwang, Hye Mi,Chang, Hyo Sik,Kang, Gi-Hwan 한국재료학회 2019 한국재료학회지 Vol.29 No.11
Recently, research on cost reduction and efficiency improvement of crystalline silicon(c-Si) photovoltaic(PV) module has been conducted. In order to reduce costs, the thickness of solar cell wafers is becoming thinner. If the thickness of the wafer is reduced, cracking of wafer may occur in high temperature processes during the c-Si PV module manufacturing process. To solve this problem, a low temperature process has been proposed. Conductive paste(CP) is used for low temperature processing; it contains Sn57.6Bi0.4Ag component and can be electrically combined with solar cells and ribbons at a melting point of $150^{\circ}C$. Use of CP in the PV module manufacturing process can minimize cracks of solar cells. When CP is applied to solar cells, the output varies with the amount of CP, and so the optimum amount of CP must be found. In this paper, in order to find the optimal CP application amount, we manufactured several c-Si PV modules with different CP amounts. The amount control of CP is fixed at air pressure (500 kPa) and nozzle diameter 22G(outer diameter 0.72Ø, inner 0.42Ø) of dispenser; only speed is controlled. The c-Si PV module output is measured to analyze the difference according to the amount of CP and analyzed by optical microscope and Alpha-step. As the result, the optimum amount of CP is 0.452 ~ 0.544 g on solar cells.
신주영(Shin Ju-Young),고석환(Ko Suk-Whan),신우균(Shin Woo-Gyun),황혜미(Hwang Hye-Mi),주영철(Ju Young-chul),강기환(Kang Gi-Hwan),장효식(Chang Hyo-Sik) 한국태양에너지학회 2021 한국태양에너지학회 논문집 Vol.41 No.5
The Korean government is actively promoting mandatory zero energy building (ZEB) implementations to achieve its goal of reducing greenhouse gas emissions. Photovoltaic (PV) technologies are hence being applied in the construction of ZEBs, and building-integrated photovoltaic (BIPV) systems are in the spotlight. BIPV systems are presently being integrated in the building envelopes as parts of the buildings, such as facades, roofs, and windows, to produce on-site clean electricity without requiring additional space. However, the monotonous black-colored BIPV modules are not popular because they affect the aesthetics of the buildings. To mitigate this problem, studies have been conducted on colored BIPV modules to improve the aesthetics of buildings by implementing various colored components. Power estimation is an important part of judging the faults in PV systems. Therefore, this paper proposes a performance estimation model using the characteristics of color BIPV systems based on I-V curve measurements. A color BIPV and meteorological monitoring systems were installed to acquire field survey data. The goal of this study was to verify the superiority of the proposed model by comparison with the power estimated using a simulation tool. The proposed model with high-accuracy power estimations is expected to help diagnose the performance of the BIPV system.