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홀수스트링 PV모듈의 바이패스 다이오드 배치에 의한 전기적 특성
신우균(Shin Woo-Gyun),고석환(Go Seok-Hwan),주영철(Ju Young-Chul),송형준(Song Hyung-Jun),강기환(Kang Gi-Hwan) 한국태양에너지학회 2017 한국태양에너지학회 논문집 Vol.37 No.4
Most PV modules are fabricated by 6 cell-strings with solar cells connected in series. Moreover, bypass diodes are generally installed every 2 cell-strings to prevent PV modules from a damage induced by current mismatch or partial shading. But, in the case of special purpose PV module, like as BIPV (Building Integrated Photovoltaic), the number of cell-strings per module varies according to its size. Differ from a module employing even cell-strings, the configuration of bypass diode should be optimized in the PV module with odd strings because of oppositely facing electrodes. Hence, in this study, electrical characteristics of special purposed PV module with odd string was empirically and theoretically studied depending on arrangement of bypass diode. Here, we assumed that PV module has 3 strings and the number of bypass diodes in the system varies from 2 to 6. In case of 2 bypass diodes, shading on a center string increases short circuit current of the module, because of a parallel circuit induced by 2 bypass diodes connected to center string. Also, the loss is larger, as the shading area in the center string is enlarged. Thus, maximum power of the PV module with 2 bypass diode decreases by up to 59 (%) when shading area varies from 50 to 90 (%). On the other hand, In case of 3 and 6 bypass diodes, the maximum power reduction was within about 3 (W), even the shading area changes from 50 to 90 (%). As a result, It is an alternative to arrange the bypass diode by each string or one bypass diode in the PV module in order to completely bypass current in case of shading, when PV module with odd string are fabricated.
태양광 패널 고장진단기기의 진단 정밀도 향상을 위한 ADC 노이즈 저감기술에 대한 연구
신현진(Shin Hyun-Jin),선용근(Seon Yong-Geun),최의성(Choi Eui-Seong),신우균(Shin Woo-Gyun),고석환(Ko Suk-Whan),지평식(Ji Pyeong-Shik) 한국태양에너지학회 2020 한국태양에너지학회 논문집 Vol.40 No.6
According to the IEA PVPS report, the global power of new photovoltaic plants in 2018 is approximately 100 GW. Large investments are expected to be made in photovoltaics in the future to improve these renewable energy sources. Photovoltaic generation is a structure that makes profits by selling power produced for 20 years, and the annual generation amount decreases by 0.7 to 0.8% every year. However, if the failure of solar panels is not detected at an early stage, their profitability cannot be guaranteed. To solve this problem, research on photovoltaic maintenance technology is required.
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.
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.
PV 모듈 DC 어레이 지락 불검출 영역 및 고장위치 검출 방법
남승엽(Nam Seung-Yeop),신우균(Shin Woo-Gyun),주영철(Ju Young-chul),황혜미(Hwang Hye-Mi),강기환(Kang Gi-Hwan),장효식(Chang Hyo Sik),고석환(Ko Suk-Whan) 한국태양에너지학회 2021 한국태양에너지학회 논문집 Vol.41 No.5
A DC ground fault detector measures the current flowing in the ground fault direction and compares it with a set value to determine whether a ground fault exists. A general DC ground fault detection method, with a non-detection dead band area, cannot detect when an accident occurs. Consequently, a DC ground fault cannot be recognized and greater damage may occur as an additional accident. In this study, the characteristics of DC ground faults were analyzed, and simulations were conducted based on the problems with the general DC ground fault detection methods. A proposed method to detect the detection deadband area that the inverter cannot detect was developed through the simulations. The simulation accuracy was measured by comparing the ratio of the fault point location in the detection deadband area to the steady state. Furthermore, a method for detecting the detection deadband area was proposed and verified by determining the presence or absence of a DC ground fault in the open state by installing an open switch in the normal state and the ratio of the fault point location.