• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.2
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• pp.1036-1043
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• 2014

The installation of PV system to the power distribution system is being increased as one of solutions for environmental pollution and energy crisis. Because the output efficiency of PV system is getting decreased because of the aging phenomenon and several operation obstacles, the technology development of output prediction and state diagnosis of PV modules are required in order to improve operation performance of PV modules. The conventional methods for output prediction by considering various parameters and standard test condition values of PV modules may have difficult and complex computation procedure and also their prediction values may produce large error. To overcome these problems, this paper proposes an optimal prediction algorithm and state diagnosis algorithm of PV modules by using least square methods of linear regression analysis. In addition, this paper presents a state diagnosis evaluation system of PV modules based on the proposed optimal algorithms of PV modules. From the simulation results of proposed evaluation system, it is confirmed that the proposed algorithms is a practical tool for state diagnosis of PV modules.

• Proceedings of the KIPE Conference
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• 2012.11a
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• pp.133-134
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• 2012

태양광 발전 시스템은 계통 전원을 공급받지 못하는 도서 지역이나 산간 지역 등에서 배터리 등의 에너지 저장장치를 연계하여 독립적으로 부하에 전력을 공급할 수 있다. 둘 이상의 태양광 패널을 이용해 독립 운전시에 에너지 발전률을 높이기 위해서는 전력 조절기 출력단의 DC 링크의 전압을 일정하게 유지시켜줄 태양광 패널과 MPPT 동작을 수행하는 패널 간의 상호 간섭에 대해서 고려하여야 한다. 본 논문에서는 두 개 이상의 태양광 모듈을 이용한 독립운전 시스템에서 안정된 DC-링크 전압동작을 보장하는 태양광 패널 및 전력 조절기의 설계 및 해석을 위해 태양전지 제어를 위한 태양전지 특성과 전력조절기의 제어 특성에 대해 알아보고자 한다.

• Journal of the Korean Society for Geothermal and Hydrothermal Energy
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• v.14 no.3
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• pp.8-14
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• 2018

PV module power is calculated on PV module surface temperature adjustment by irradiation on the summer and autumn in NOCT(Nominal Operating Cell Temperature) conditions. The summer and autumn periods were selected because of large variation in outdoor air temperature and irradiation. This study was performed to understand relationship between PV module surface temperature and photovoltaic power using field measurement. As a results, it was determined that the amount of irradiation was proportional to the amount of photovoltaic power in the field measurement. However, it was also identified that the PV power generation decreased by increased PV module surface temperatures due to irradiation.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.24 no.4
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• pp.135-140
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• 2024

It is said that PV power generation systems have a long lifespan compared to other renewable energy sources and require little maintenance. However, there are cases where the performance expected during initial design is not achieved due to shading, temperature rise, mismatch, contamination/deterioration of PV modules, failure of inverter, leakage current, and arc generation. Therefore, in order to solve the problems of these systems, the power generation amount and operation status are investigated qualitatively, or the performance is comparatively analyzed based on the performance ratio (PR), which is the performance index of the solar power generation system. However, because it includes large losses, it is difficult to accurately determine whether there are any abnormalities such as performance degradation, failure, or defects in the PV power generation system using only the performance coefficient. In this paper, we studied a status diagnosis algorithm for shading, inverter failure, leakage, and arcing of PV modules to optimize the power generation of PV power generation systems according to changes in the surrounding environment. In addition, using the studied algorithm, we examined the results of an empirical test on condition diagnosis for each area and the resulting optimized operation of power generation.

• Plant Journal
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• v.17 no.4
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• pp.41-52
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• 2021

In this study, the PV output and module temperature values were predicted using the Meteorological Agency data and compared with actual data, weather, solar radiation, ambient temperature, and wind speed. The forecast accuracy by weather was the lowest in the data on a clear day, which had the most data of the day when it was snowing or the sun was hit at dawn. The predicted accuracy of the module temperature and the amount of power generation according to the amount of insolation decreased as the amount of insolation increased, and the predicted accuracy according to the ambient temperature decreased as the module temperature increased as the ambient temperature increased and the amount of power generated lowered the ambient temperature. As for wind speed, the predicted accuracy decreased as the wind speed increased for both module temperature and power generation, but it was difficult to define the correlation because wind speed was insignificant than the influence of other weather conditions.

• Journal of the Korean Solar Energy Society
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• v.25 no.4
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• pp.141-153
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• 2005

PV 태양광 발전은 PV 재료가 고가이므로 일반 전력비용에 비해 상대적으로 비용이 높아진다. 저가형 광학 집광기술과 PV를 통합하게 되면, 비용뿐만 아니라 설치면적 등에서 유리하게 되나, 집광기의 단점이 함께 추가되게 된다. 집광기는 작은 수광각과 송신광선을 갖고 있어 PV 모듈에 필요한 태양광, 광학손실의 손실정도를 최소화하기 위한 신중한 시스템 디자인과 2축형 트레킹 장치가 필요하다. 고정식 비집광 시스템보다 더 많은 에너지를 얻기 위해서는 광학시스템의 손실율을 줄이고, 고효율의 PV 모듈을 이용한 PV셀의 상호연결이 필요하다. 본 논문에서는 우선, 비이미지 프레넬 렌즈 집광기를 사용한 PV 시스템에 대하여 간단하게 설명한 후, 출력전력값을 이론적으로 예측하고 PV 효율과 시스템 성능을 제시하였다. 프레넬 렌즈 선형 집광기 통합 PV 시스템과 비집광 PV 모듈의 출력전력값과 시스템 비용을 비교하면, PV 전력비용을 줄일 수 있는 집광기의 이용이 유용한 것을 알 수 있다. 따라서, 집광형 PV 시스템은 미래의 에너지 이용에 매우 유리한 시스템이라 할 수 있다.

• Proceedings of the KIPE Conference
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• 2016.11a
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• pp.196-197
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• 2016

신재생 에너지와 배터리를 이용하여 소규모로 계통을 구축하여 부하에 전기를 공급하는 시스템을 Microgrid라 한다. 태양광 모듈과 배터리의 성능 향상 및 가격 경쟁력 강화로 인하여, Microgrid는 오지에 전기를 공급하거나 기존 디젤 발전시설을 대체하거나 운영 비용을 감소하는 용도로 각광 받고 있다. 본 논문에서는 디젤 발전기와 강에서 유체동력 발전기로 전기를 공급하는 시스템에 태양광과 배터리를 설치하여 기존 발전 비용을 최소화 하면서 최단 시간내에 투자 비용을 회수할 수 있는 솔루션을 제안한다.

• 한국신재생에너지학회:학술대회논문집
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• 2008.10a
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• pp.114-117
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• 2008

본 연구에서는 알루미늄 반사판을 이용한 저집속 (2.25X) 집광형 태양광 모듈을 설계 및 제작하여 실증 연구를 실시하였다. 반사판을 이용한 집광형PV시스템의 성능향상을 평가하기 위하여, 일사량과 모듈온도 변화에 따른 출력변화와 효율변화를 평판형 모듈과 집광형 모듈에 대해서 각각 측정하고 비교하였다. 결과적으로 반사판을 사용 집속한 모듈이 약 20% 이상의 출력 증가를 보였으며, 모듈의 평균 온도 상승에도 불구하고 1.4 배의 발전효율 증가를 확인하였다.

• Smart Media Journal
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• v.3 no.1
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• pp.22-27
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• 2014

Recently, domestic energy environment is facing new challenges owing to the depletion of fossil fuel such as oil. Renewable energy resources including solar and wind energy are attracting more interests than ever before. However, solar power system is costly in comparison with the conventional power generation systems and also the energy density is low. Furthermore, large area is required in order to install solar power system. Generally, performance of solar power system is affected by weather conditions and alignment of sun and the solar cell modules. In this study, a new type of sun tracking system for solar power system is proposed. To verify the feasibility of the proposed system, actual implementation of prototype system and experiments are carried out.

• 한국태양에너지학회:학술대회논문집
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• 2008.04a
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• pp.263-268
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• 2008

Building Integrated PV(BIPV) is one of the best fascinating PV application technologies. To apply PV module in building, various factors should be reflected such as installation position, shading, temperature, and so on. Especially a temperature should be considered, for it affects both electrical efficiency of a PV module and heating/cooling load in a building. This study investigates a semitransparent PV module that is designed as finished material for windows. Therefore it needs to considerate about the optical characteristics of the transparent module. It reports the effect of thermal and optical characteristics of the PV module on generation performance. The study was performed by measuring sun spectrum and luminance through the PV modules and by monitoring the temperature and experiment. The results showed that 1 degree temperature rise reduced about 0.48% of output power.