태양광 발전 PCS 구성부품에 대한 열적특성 및 고장모드영향분석

김두현 ( Doo-hyun Kim ),김성철 ( Sung-chul Kim ),김윤복 ( Yoon-bok Kim ) 한국안전학회(구 한국산업안전학회) 2018 한국안전학회지 Vol.33 No.4

This paper is analyzed for the thermal characteristics(1 year) of the 6 components(DC breaker, DC filter(including capacitor and discharge resistance), IGBT(Insulated gate bipolar mode transistor), AC filter, AC breaker, etc.) of a photovoltaic power generation-based PCS(Power conditioning system) below 20 ㎾. Among the modules, the discharge resistance included in the DC filter indicated the highest heat at 125℃, and such heat resulting from the discharge resistance had an influence on the IGBT installed on the rear side the board. Therefore, risk priority through risk priority number(RPN) of FMEA(Failure modes and effects analysis) sheet is conducted for classification into top 10 %. According to thermal characteristics and FMEA, it is necessary to pay attention to not only the in-house defects found in the IGBT, but also the conductive heat caused by the discharge resistance. Since it is possible that animal, dust and others can be accumulated within the PCS, it is possible that the heat resulting from the discharge resistance may cause fire. Accordingly, there are two options that can be used: installing a heat sink while designing the discharge resistance, and designing the discharge resistance in a structure capable of avoiding heat conduction through setting a separation distance between discharge resistance and IGBT. This data can be used as the data for conducting a comparative analysis of abnormal signals in the process of developing a safety device for solar electricity-based photovoltaic power generation systems, as the data for examining the fire accidents caused by each module, and as the field data for setting component management priorities.

실험에 의한 공기식 PVT 컬렉터의 열 ‧ 전기 성능에 관한 연구

김상명,김진희,김준태 한국태양에너지학회 2019 한국태양에너지학회 논문집 Vol.39 No.2

PVT (Photovoltaic/thermal) system is technology that combines PV and solar thermal collector to produce and use both solar heat and electricity. PVT has the advantage that the energy production per unit area is higher than any single use of PV or solar thermal energy systems because it can produce and use heat and electricity simultaneously. Air-type PVT collectors use air as the heat transfer medium, and the air flow rate and flow pattern are important factors affecting the performance of the PVT collector. In this study, a new air-type PVT collector with improved thermal performance was designed and manufactured. And then thermal and electrical performance and characteristics of air-type PVT collector were analyzed through experiments. For the thermal performance analysis of the PVT collector, the experiment was conducted under the test conditions of ISO 9806:2017 and the electrical performance was analyzed under the same conditions. As a result, the thermal efficiency increased to 26~45% as the inlet flow rate of PVT collector increased from 60~200 m3/h. Also, it was confirmed that the air-type PVT collector prevents the PV surface temperature rise according to the operating conditions.

교육용 시설 태양광발전 설비의 전력생산량 평가에 관한 연구

주재욱,김한수,김경환,임형철,최정민 대한건축학회지회연합회 2007 대한건축학회지회연합회 학술발표대회논문집 Vol.2007 No.1

Although photovoltaics (PV) proved very reliable, the cost was initially too high for earthbound applications. Continuing research brought the price down to make PV useful for powering not only houses, apartment house but also telephone relay stations, buoys, railroad signals, and other electrical installations remote from the grid. However, studies are mainly focused on the housing cases. Therefore, in this study, 50 kWp PV system which is installed at the educational facility located at Changwon is chosen and evaluated the hourly, daily, weekly and monthly electricity generated and peak time electricity. At the final stage, the simply payback period is calculated for the comparison.

흡열판의 종류에 따른 UnglazedPVT 모듈의 성능 실험 분석

천진아(Chun, Jin-Aha),정선옥(Jeong, Seon-Ok),김진희(Kim, Jin-Hee),김준태(Kim, Jun-Tae),조인수(Cho, In-Soo),남승백(Nam, Seung-Baeg) 한국태양에너지학회 2011 한국태양에너지학회 학술대회논문집 Vol.2011 No.11

A photovoltaic/thermal(PVT)collector produces both thermal energy and electricity simultaneously. The heat from PV modules should be removed for better electrical performance, and can be converted into useful thermal energy. A PVT module is a combination of PV module with a solar thermal collector which forms one device that converts solar radiation into electricity and heat. In general, there are two different types of PVT module:glazed PVT module and unglazed PVT module. On the other hand, two types of the PVT module can be distinguished according to absorber on PV module rearside: the sheet-and-tube absorber PVT module and the fully wetted absorber PVT module. The absorber collector plays an important function in PVT system. It cools down the PV module, while collecting the thermal energy produced in the form of hot water. The aim of this study is to compare the electrical and thermal performance of two different PVT collectors, one with the rectangular tube and the other with fully wetted absorber PVT collectors. For this paper, the PVT collectors with two different types of thermal absorber were made, and both the thermal and electrical performance of them were measured in outdoor, and the results were compared. The experimental results were analyzed that the thermal efficiency of the fully wetted absorber PVT collector is about 8.7% higher than the sheet-and-tube absorber PVT collector, and for the electrical efficiency, the fully wetted absorber PVT collector had about7% higher than the rectangular tube absorber.

Design and Control of an Optimized Battery Charger for an xEV Based on Photovoltaic Power Systems

Dong-Hee Kim,Gyu-Yeong Cheo,Byoung-Kuk Lee 대한전기학회 2014 Journal of Electrical Engineering & Technology Vol.9 No.5

The continuous growth of electric vehicles has caused electric power shortages in conventional utilities owing to the charging of electric-vehicle batteries. In order to increase the capacity of these utilities, photovoltaic systems may be an appropriate solution because of their benefits. However, a large amount of loss is generated in a conventional charging structure using photovoltaic sources owing to the many power conversion processes. This paper describes a simple integrated battery charger that utilizes a PV generation system. Moreover, the system control algorithm is deduced by analyzing the operation modes in order to control the proposed integrated system. The proposed system and algorithm are verified by a 3.3-kW prototype, resulting in an increase in the efficiency of approximately 7% to 15% compared with the conventional system. And, to examine the feasibility of the proposed system, the simulation for multi-charger with various conditions are progressed.

Design and Control of an Optimized Battery Charger for an xEV Based on Photovoltaic Power Systems

Kim, Dong-Hee,Cheo, Gyu-Yeong,Lee, Byoung-Kuk The Korean Institute of Electrical Engineers 2014 Journal of Electrical Engineering & Technology Vol.9 No.5

The continuous growth of electric vehicles has caused electric power shortages in conventional utilities owing to the charging of electric-vehicle batteries. In order to increase the capacity of these utilities, photovoltaic systems may be an appropriate solution because of their benefits. However, a large amount of loss is generated in a conventional charging structure using photovoltaic sources owing to the many power conversion processes. This paper describes a simple integrated battery charger that utilizes a PV generation system. Moreover, the system control algorithm is deduced by analyzing the operation modes in order to control the proposed integrated system. The proposed system and algorithm are verified by a 3.3-kW prototype, resulting in an increase in the efficiency of approximately 7% to 15% compared with the conventional system. And, to examine the feasibility of the proposed system, the simulation for multi-charger with various conditions are progressed.

벽면부착방식 PV시스템의 建築物 適用可能性에 關한 硏究

김재원,오민석,이성주,최인창,이응직,김회서 대한건축학회 2003 대한건축학회논문집 Vol.19 No.6

Building integrated photovoltaic(BiPV)systems can from a cohesive design, construction, and energy solution for the built environment. The benefits of building integration are well documented and are gaining significant public recognition and government support. PV cells, however, convert only a small portion of the incoming isolation in to electricity. The rest is either reflected or lost in the form of sensible heat and light. In order to judge of the Integration capability to the BIPV system, energy efficiency, capacity and integration capability is studied by considering the production quantity of electric power and U-value of PV system.

전면 액체식 흡열판을 적용한 PVT 모듈의 실험성능

천진아(Chun Jin-Aha),김진희(Kim Jin-Hee),김준태(Kim Jun-Tae),조인수(Cho In-Soo),남승백(Nam Seung-Baeg) 한국태양에너지학회 2011 한국태양에너지학회 학술대회논문집 Vol.2011 No.4

The heat from PV modules should be removed for better electrical performance, and can be converted into useful thermal energy. A photovoltaic-thermal(PVT) module is a combination of PV module with a solar thermal collector which forms one device that converts solar radiation into electricity and heat simultaneously. In general, there are two different types of PVT module: glazed PVT module and unglazed PVT module. On the other hand, two types of the PVT module can be distinguished according to absorber on PV module rear side: the sheet-and-tube absorber PVT module and the fully wetted absorber PVT module. In this paper, the experimental performance of water type unglazed PVT with fully wetted absorber was analyzed. The electrical and thermal performance of the unglazed PVT were measured in outdoor conditions, and the results were analyzed. The experimental results showed that the thermal efficiency of the PVT module was 42% average, and its electrical efficiencies were 15.2% and 14.2% average, respectively, for the mean fluid temperature of 10-20℃ and 21-30℃. Thermal efficiency depends on solar radiation, mean fluid temperature and ambient temperature. The PVT module temperature is related to the cooling effect of the PV module by the fluid of the absorber. The results proved that the electrical efficiency was higher when the mean fluid temperature was lower.

Neural Network Self-Organizing Maps Model for Partitioning PV Solar Power

Munshi, Amr International Journal of Computer ScienceNetwork S 2022 International journal of computer science and netw Vol.22 No.5

The growth in global population and industrialization has led to an increasing demand for electricity. Accordingly, the electricity providers need to increase the electricity generation. Due to the economical and environmental concerns associated with the generation of electricity from fossil fuels. Alternative power recourses that can potentially mitigate the economical and environmental are of interest. Renewable energy resources are promising recourses that can participate in producing power. Among renewable power resources, solar energy is an abundant resource and is currently a field of research interest. Photovoltaic solar power is a promising renewable energy resource. The power output of PV systems is mainly affected by the solar irradiation and ambient temperature. this paper investigates the utilization of machine learning unsupervised neural network techniques that potentially improves the reliability of PV solar power systems during integration into the electrical grid.

인공신경망을 이용한 태양광열 시스템의 열 및 전기 성능예측 모델 개발

오진환,배상무,남유진 대한설비공학회 2022 설비공학 논문집 Vol.34 No.4

Recently, Zero Energy Building (ZEB) that reduces the energy consumption and energy demand is becoming major issue. To realize ZEB, high energy efficiency renewable energy systems are actively applied in the building. Among the renewable energy systems, the photovoltaic-thermal (PVT) systems can respond heat and electricity demands of the buildings with one facility. Although, it is necessary to accurately predict the performance of the PVT system, most studies are conducted at the mock-up test level, through energy simulation and laboratory-scale experiment. In this study, the real-scale experiment plant that comprises the PVT module, heat storage tank, and actual building was constructed to collect the database of the PVT system under actual conditions. Moreover, based on the real-scale experimental data, the performance prediction model was constructed using artificial neural network (ANN). To verify the accuracy of the performance prediction model based on ANN, the coefficient of variation root mean square error (Cv(RMSE)) proposed by ASHRAE Guideline 14 was used. The Cv(RMSE) for the predicted result by ANN was calculated as 10% of the thermal efficiency, and 16% of the electrical production. Through the Cv(RMSE) result, it was confirmed that the performance prediction model based on ANN is reliable. 본 연구에서는 소규모 사업자 및 실무자 등이 시스템 성능을 설계단계에서 검토할 수 있는 기초자료로써 활용하기 위하여 인공신경망 기반 PVT 예측 모델을 구축하였다. 또한, 실증실험을 통하여 수집된 데이터와 인공신경망의 예측결과를 비교하여 구축된 인공신경망 모델을 검증하였다. 본 연구의 결과에 대한 요약은 다음과 같다. (1) 실증실험을 수행하여 인공신경망의 입․출력 데이터를 수집하였으며, 피어슨 상관계수 분석을 통하여 결정계수가 0.2 미만인 변수는 제거하였다. 선별된 입력변수는 정규화 과정을 거쳐 인공신경망 모델에 적용하였다. (2) 입․출력 데이터에 대한 피어슨 상관계수 결과를 토대로 결정계수(r2)를 산출하여 PVT 열효율은 PVT 유량 및 일사량, PVT 발전량의 경우 외기온도, 일사량이 가장 큰 영향을 미치는 것을 확인하였다. (3) 실증실험을 통하여 측정된 데이터와 인공신경망 모델의 예측결과의 해석 결과 간 Cv(RMSE)는 PVT 열효율 10.44%, PVT 전력생산량 16.34%로 계산되었다. 따라서, 본 연구에서 개발된 인공신경망 기반 PVT 성능예측 모델은 ASHRAE Guideline 14-2014에서 제안하는 30% 범위에 수용하여 신뢰성이 있음을 확인하였다. (4) 본 연구에서 개발된 인공신경망 기반 PVT의 성능 예측 모델은 설계 변수가 다수 필요한 기존의 에너지 시뮬레이션보다 모델 구축 및 해석 시간을 단축할 수 있을 것으로 사료된다. 본 연구에서는 하절기의 PVT 실험 데이터에 기반하여 성능예측 모델을 구축하였으므로 PVT의 연간 성능을 정확히 예측하기에는 한계점이 있다. 향후, 동절기 장기간 실험 데이터를 수집하여 다양한 다수의 데이터를 확보 및 적용하여 오버피팅(Overfitting)을 억제하여 개발된 PVT 시스템 성능예측모델의 정확도를 향상시킬 예정이다.