• Journal of the Korean Solar Energy Society
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• v.29 no.1
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• pp.18-23
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• 2009

We intend to describe a 12kW building-integrated photovoltaic system which was applied into the south wall of a new building. This study showed the results that were appeared from describing the PV module manufacture and installation process, and performing generation performance analysis of BIPV system. From the result we confirmed that the generation performance of the BIPV system was changed by season. The performance ratio(PR) was about 83.6% in winter and it means that performance of this BIPV system was so good in that season. On the other hand, the PR in summer was about 75.0% dropped about 8%. It was believed that the change was influenced by the reduction of solar radiation irradiated into the PV modules by installation position and rainy spell in summer. And we also confirmed that low irradiation condition is cause of the additional loss in the total PV system. In this case, the efficiency ratio of PCS drops significantly at low input loads and the average conversion efficiency of PCS in summer was 76.4% decreased about 10% from 86% in winter.

• Journal of the Korean Solar Energy Society
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• v.39 no.6
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• pp.93-112
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• 2019

In this paper, a very new web-based software for renewable energy system (RES) design and economic evaluation was introduced. This solution would provide the precise RES estimation service including not only photovoltaic (PV), wind turbine (WT) and fuel cell (FC) individually but also energy storage system (ESS) as combined forms with PV or WT. The three reasons why we ought to develop it are: First, the standardized tool suitable to the domestic environment for estimating power generation from RES facilities and economic evaluation is required. Secondly, the standardized tool is needed to spread domestic RES supply policy and to promote the new industry in the micro-grid field. The last, the reliability of economic evaluation should be enhanced more for new facilities. To achieve those aims, the weather database of one hundred locations have established and the RES facility database has also constructed. For the energy management, mathematical models for PV, WT, ESS and FC were developed. As a final phase, the analytical process to evaluate economics has performed with field data verification.

• Journal of the Korean Solar Energy Society
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• v.39 no.6
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• pp.113-125
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• 2019

With the opening of the small power brokerage business market in December 2018, the small power trading market has started in Korea. Operators must submit the day-ahead estimates of power output and receive incentives based on its accuracy. Therefore, the accuracy of power generation forecasts is directly affects profits of the operators. The forecasting process for power generation can be divided into two procedure. The first is to forecast solar irradiation and the second is to transform forecasted solar irradiation into power generation. There are two methods for transformation. One is to simulate with physical model, and another is to use regression model. In this study, we found the best-fit regression model by analyzing hourly data of PV output and solar irradiation data during three years for 242 PV plants in Korea. The best model was not a linear model, but a sigmoidal model and specifically a Gompertz model. The combined linear regression and Gompertz curve was proposed because a the curve has non-zero y-intercept. As the result, R² and RMSE between observed data and the curve was significantly reduced.

• Current Photovoltaic Research
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• v.3 no.4
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• pp.121-125
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• 2015

BIPV system is one of the best ways to harness PV module. The BIPV system not only produces electricity, but also acts as a building envelope. Thus, it has the strong point of increasing the economical efficiency by applying the PV modules to the buildings. Bifacial solar cells can convert solar energy to electrical energy from both sides of the module. In addition, it is designed as 3 busbar layout which is the same with ordinary mono-facial soalr cells. Therefore, many of the module manufacturers can easily produce the bifacial solar cells without changing their manufacturing equipment. Moreover, bifacial BIPV system has much potential in building application by utilizing glass to glass structure. However, the performance of bifacial solar cells depends on a variety of factors, ranging from the back surface to surrounding conditions. Therefore, in order to apply bifacial solar cells to buildings, an analysis of bifacial PV module performance should be carried out that includes a consideration of various design elements, and reflects a wide range of installation conditions. As a result it found that the white insulation reflector type can improve the performance of the bifacial BIPV system by 16%, compared to the black insulation reflector type. The performance of the bifacial BIPV was also shown to be influenced by inclination angle, due to changes in both the amount of radiation captured on the front face and the radiation transmitted to the rear face through the transparent space. In this study is limited design condition and installation condition. Accordingly follow-up researches in this part need to be conducted.

• Journal of Advanced Navigation Technology
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• v.22 no.6
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• pp.654-664
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• 2018

In this paper, this system is operated by PCS that is driven by being synchronized voltage fed inverter and AC source, and in the steady state of power source charge battery connected to DC side with solar cell using a photovoltaic (PV) that it was so called constant voltage charge. it can cause the effect of energy saving of electric power, from 10 to 20%. and through a normal operation of electric energy storage system (EESS). In addition, better output waveform was generated because of pulse width modulation (PWM) method, and it was Proved to test by experiment maintained constant output voltage regardless of AC source disconnection, load variation, and voltage variation of AC power source.

• Current Photovoltaic Research
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• v.9 no.1
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• pp.17-21
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• 2021

In this study, the effect of water level and temperature on the power generation was investigated in a water tank with an aquavoltaic PV module to perform feasibility research for the development of salt farm aquavoltaic system. The silicon solar cell attached to the bottom of each water tank is a 1-cell mini module, and the underwater effects of the crystal phase (19.0~19.9% of single- & 17.9~19.9% of poly-crystalline) of the PV module were investigated, and power generation characteristics for water level (0~10 cm) and temperature (10~40℃) were analyzed. The deterioration coefficients according to the water level and temperature of each single- and poly-crystalline module were investigated at very similar levels such as, -2.01 %/cm and -2.02 %/cm, -0.50 %/℃ and -0.48 %/℃, respectively. Therefore, in salt farm aquavoltaic system, water levels need to maintain as low as possible, and heat-induced degradation is similar to those shown in general land, and no factors have been found to be affected by the underwater environment depending on the determination.

• The Journal of the Korea institute of electronic communication sciences
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• v.17 no.2
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• pp.299-308
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• 2022

Recent, energy transition policies are driving to increase in the number of small photovoltaic(PV) generators. It is difficult for system operators to accurately anticipate the amount of power generated from such small scale PV generation, and this may disrupt dispatch schedules and result in an increase in cost. The need for a Virtual Power Plant(VPP) is emerging as a way of resolving these problems, as it would integrate small-scale PV plants and eliminate uncertainty about the amount of power generated, control voltage, and provide power reserves. In this paper, the cost evaluation methods are described for determination of VPP cloud charges both Net Present Value(NPV) method and Profitability Index(PI) method, the calculated outcomes of the two types of cost evaluation methods are presented in detail. It seems we secure profitability as we get 1.22 of profitability index from calculation results, it may be attractive for the aggregator as NPV is enough for satisfying profitability.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.1062_1063
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• 2009

청정에너지로 각광받고 있는 태양광발전은 지구환경문제가 작금의 관심사로 떠오르면서 더욱더 보급이 확산되고 있다. 정부에서도 태양광발전 사업자의 지원정책과 일반보급사업, 지방보급사업 및 100만호 보급사업 등의 강력한 정책적 지원으로 보급의 활성화를 위한 기반을 마련하게 되었다. 미래의 지구환경과 청정에너지에 대한 국민들의 관심 고조 등은 정부정책과 맞물려 전력계통에 대규모 대용량의 발전시스템과 다수의 시스템이 도입되면서 전력계통 운영에 작은 변화를 보여 주고 있다. 본 고에서는 태양광발전의 계통도입에 대한 검토사항과 확대 도입에 의한 영향에 대하여 고찰하고자 한다.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.1118-1119
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• 2008

태양광 발전 시스템 분야는 유가 폭등과 신재생에너지에대한 인식변화, 발전차액 지원제도와 함께 국내 시장에 급속도로 보급이 이뤄지고 있으며 그 활용분야 또한 기존의 주택 시장을 넘어 발전사업, 타 분야와의 연계성을 가지며 활발한 연구 및 시장 확대가 이뤄지고 있다. 본 논문에서는 태양광 발전 시스템과 기존 조명 시스템을 대체해 나가며 기하급수적인 보급을 보이고 있는 LED를 접목한 승강장 개발에 관한 논문이다. 태양광/LED 시스템을 적용한 승강장은 독자적인 운영이 가능하고 기존 승강장이 갖지 못했던 조명 및 광고 기능을 제공함으로써 태양광 발전과 LED 조명에 대한 저변 확대와 관련 기술 응용에 큰 기여를 할 것이라 사료된다.

• Proceedings of the KIPE Conference
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• 2017.07a
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• pp.196-197
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• 2017

최근 국내 태양광산업은 보급량이 증가하고 있고, 정부 정책에서도 에너지신산업을 추진하는 등 시장 활성화에 노력하고 있다. 본교에서는 신재생에너지원 중 태양광발전시스템에 대해 건학이념인 실사구시에 입각한 학부 교육 프로그램을 개발 및 적용하고 있으며 본 논문에서는 이에 대한 내용을 소개한다. 산업체 실무에 기초한 태양광발전시스템 학부 교육 프로그램은 마이크로콘트롤러(MCU) 교육, DC-DC 컨버터와 DC-AC 인버터 등 전력변환장치 기반의 Solar Explorer Kit 교육, 태양광발전시스템 발전량 산출과 손실분석 등 성능평가를 위한 PVsyst 엔지니어링 교육 내용으로 구성된다. 특히, 전력변환장치로 구성된 Solar Explorer Kit 교육 프로그램은 DC-DC 컨버터와 배터리(리튬-폴리머) 충전, 배터리(리튬-폴리머) 방전과 DC LED 부하 접속, 독립형 DC-AC 인버터 출력과 AC 할로겐 램프 부하 접속, 계통연계형 DC-AC 인버터 출력 실습 등에 대해 소개한다.