• 한국산업융합학회 논문집
• /
• 제22권4호
• /
• pp.395-403
• /
• 2019

The excessive need of power is creating an unbalance situation in power sector, where solar energy is one of the best solutions among other energy sources to mitigate this demand. It is globally accepted because of its flexibility and long life compared to others. A lot research is going on to enhance the energy efficiency by introducing photovoltaic (PV) power generation technology, but still irradiation of PV power is the major problem. In this manuscript, we have designed PV module using single diode methodology and also the solar conversion efficiency was boosted with maximum power point tracking (MPPT) by using perturb and observe (P&O) algorithm. The simulation was done for $1000W/m^2$ and $800W/m^2$ at solar irradiance in cell temperature of 25C and 40C degree levels in PSIM tool.

• 신재생에너지
• /
• 제7권2호
• /
• pp.28-35
• /
• 2011

Recently, photovoltaic systems have been devolved into much larger systems up to MW-scale. Photovoltaic industry participants give their focus on power generation capability of photovoltaic modules because their benefits can be decided from the amount of generation. The information on long-term performance change of photovoltaic modules helps to estimate the amount of power generation and evaluate the economic cost-benefits. Long-term performance of a PV system has been analyzed with operation data for 12 years from 1999 to 2010. In the first year, the amount of yearly power generation was 57.7 MWh with 13.2% capacity factor. In 2007, the amount of yearly generation was 44.3 MWh with 10.14% capacity factor, and in 2010, the amount was decreased down to 38.1 MWh with 8.7% capacity factor. The result means that long-term capacity factor has been 4.5% decreased for 12 years and that the amount of generation has been decreased 34.0% for 12 years which is 2.8 % per year. The latter capacity factor has been decreased faster than 0.20%, the average rate for 10 years. The performance decrease of the PV system is meant to be accelerated. The decrease of performance and utilization is due to aged deterioration of photovoltaic modules and lowering conversion efficiency of PCS.

• Current Photovoltaic Research
• /
• 제6권1호
• /
• pp.1-11
• /
• 2018

Current major photovoltaic (PV) market share (> 60%) is being occupied by the multicrystalline (mc)-silicon solar cells despite of low efficiency compared to single crystalline silicon solar cells. The diamond wire sawing technology reduces the production cost of crystalline silicon solar cells, it increases the optical loss for the existing mc-silicon solar cells and hence its efficiency is low in the current mass production line. To overcome the optical loss in the mc-crystalline silicon, caused by the diamond wire sawing, next generation texturing process is being investigated by various research groups for the PV industry. In this review, the limitation of surface structure and optical loss due to the reflectivity of conventional mc-silicon solar cells are explained by the typical texturing mechanism. Various texturing technologies that could minimize the optical loss of mc-silicon solar cells are explained. Finally, next generation texturing technology to survive in the fierce cost competition of photovoltaic market is discussed.

• 한국진공학회:학술대회논문집
• /
• 한국진공학회 2013년도 제45회 하계 정기학술대회 초록집
• /
• pp.245.2-245.2
• /
• 2013

Solution processed organic photovoltaic devices have relatively less attention compared to polymer photovoltaic devices even though they have high possibility to be developed because they have both advantages of polymer and organic, such as solution processable, no synthetic batch dependence of photovoltaic performance, high purity and high charge carrier mobility as well as relatively high efficiency (~7%). In addition, solution processed organic photovoltaic devices have an advantage of easiness to study the relationship between the molecular structure and photovoltaic performance due to its simple structure. In this work, five isoindigo based low band gap donor-acceptor-donor (D-A-D) small molecules with different electron donating strength were synthesized for investigating the relationship between the molecular structure and photovoltaic performance, especially, investigating the effects of different electron donating effect of donor group in isoindigo backbone to photovoltaic device performance. The variation of electron donating strength of donor group strongly affected the optical, thermal, electrochemical and photovoltaic device performances of isoindigo organic materials. The highest power conversion efficiency of ~3.2% was realized in bulk heterojuction photovoltaic device consisted of the ID3T as donor and PC70BM as acceptor. This work demonstrates the great potential of isoindigo moieties as electron deficient units as well as guideline for synthesis of donor-acceptor-donor (D-A-D) small molecules for realizing highly efficient solution processed organic photovoltaic devices.

• 한국산업융합학회 논문집
• /
• 제23권3호
• /
• pp.491-498
• /
• 2020

Recently, In the production line of batteries, charge and discharge tests are essential to verify battery characteristics. In this case, the battery charging uses a unidirectional AC/DC converter capable of output voltage and current control, and the discharge uses a resistive load. Since this method consumes energy during discharge, it must be replaced with a bi-directional AC/DC converter system capable of charging and discharging. Although it is difficult to replace the connected inverter part of the bi-directional AC/DC converter system due to the high cost, the spread of the solar-connected inverter rapidly increases as the current solar supply business is activated, and thereby the solar-connected type Inverter prices are plunging. If it can be used as a power converter for battery discharge without program modification of the solar-powered inverter, it will have competition. In this paper, propose a new battery discharge system using a combination of a photovoltaic DC/DC simulator and photovoltaic PCS using a battery to be used as a power converter for battery discharge without program modification of a low-cost photovoltaic inverter. In addition, propose an optimal solar characteristic curve for the stable operation of PCS. The validity of the proposed system was verified using a 500[W] class solar DC/DC simulator and a solar PCS prototype.

• 전기학회논문지P
• /
• 제64권4호
• /
• pp.337-342
• /
• 2015

The company of 4 core materials that are needed for photovoltaic generation is located in area around this university in Gunsan, Saemangeum. And also, it was almost completed the value chain about the production of Polysilicon, Ingot, Wafer, modules and the design, construction of generation system. The industry-academy-government has understood that because of the relative companies' production and investment, it leads to a supply and demand of manpower and thus will have field centered manpower education. This program will help the problem of lack of manpower in relative companies by establishing competitive major agreement like vocational education system. Also, the university and the participating company in joint have pushed ahead field business education to make the least of industrial-education's mismatch, the training of professional manpower connected with related industries to make the universities chemical characteristics, companies securing excellent manpower and contributed to the revitalization of the regional economy. In this paper, are aware that photovoltaic industry is a future strategic industry for the country, so we will train the immediately site adapting manpower for the area of photovoltaic material and system as our goal. This is shown results of education operation for 4 years.

• 한국전자통신학회논문지
• /
• 제9권7호
• /
• pp.799-804
• /
• 2014

무한정한 발전자원과 무공해성 등의 장점을 가진 태양광 발전 시스템은 직류전력을 생산하기 때문에 계통의 연계송전이 가능한 교류전력으로 변환시켜주기 위해서는 태양광 인버터의 사용이 필요하다. 외부에 옥외형 구조로 노출되어 설치되는 소용량의 태양광 인버터는 태양이 강하게 내리쬐는 낮 시간 및 여름철과 같이 외부 환경의 온도가 상승함에 따라 에너지 손실이 발생하고 효율이 감소하게 된다. 태양광 발전 산업의 범위가 확대됨에 따라 태양광 인버터 또한, 상당한 에너지 손실 문제를 야기하므로 이에 따른 대책이 필요하다. 따라서 본 논문에서는 온도조건에 구애받지 않도록 태양광 인버터 외함에 열전소자를 부착한 냉각장치를 설치하고 냉각효과의 극대화를 위해 두 개의 냉각장치를 사용하여 위치 조절에 따른 냉각효과를 비교분석하고자 한다.

• 한국신재생에너지학회:학술대회논문집
• /
• 한국신재생에너지학회 2007년도 추계학술대회 논문집
• /
• pp.678-681
• /
• 2007

Now Korea depends upon the imported resources for about 97% of total using energy. So from October, 2001 Korean government has supported renewable energy business owners by providing them with Electric Power Industry Basis Fund. Only plant-use electricity of the small hydro power plant is exactly managed, but other renewable energy plants is unprepared or not yet managed. Therefore, in this paper, we'll analyze the plant-use electricity management of the small hydro power and propose improvement plans for plant-use electricity of the photovoltaic power plant.

• 기술혁신학회지
• /
• 제14권3호
• /
• pp.578-598
• /
• 2011

본 논문은 차세대 그린에너지원으로 주목받고 있는 태양광산업의 핵심소재 기술에 대한 가치를 실물 옵션 기법을 이용하여 추정한다. 본 논문의 기여는 두 가지이다. 하나는 방법론적인 기여로서, 실물옵션의 기초자산 불확실성을 대변하는 변수로서 주가를 고려하여 실물옵션 적용에서 가장 복잡한 단계인 기초자산 불확실성의 모형과정을 대폭 단순화시켰다. 다른 하나는 응용장의 기여로서, 최근 수요가 크게 증가하고 있는 태양광산업의 핵심소재인 폴리실리콘의 생산공정 기술의 경제적 가치를 평가하였다. 분석사례인 폴리실리콘 산업의 A기업에 적용한 결과, 동 기업의 폴리실리콘 기술의 기초자산이 기하브라운모션을 따르는 것으로 나타났으며 이러한 결과에 블랙-숄즈 옵션가격결정모형을 적용하여 A기업의 폴리실리콘 기술에 대한 콜옵션의 가치는 약 34,229억원으로 측정되었다.

• 한국태양에너지학회:학술대회논문집
• /
• 한국태양에너지학회 2008년도 추계학술발표대회 논문집
• /
• pp.196-201
• /
• 2008

The photovoltaic(PV) industry has been growing around the PV advanced countries such as Japan, Germany, Europe and USA. In recent years, China became a strong performer in the world PV market share, increasing solar cell production rapidly The global photovoltaic (PV) market grew by over 40% in 2007, with approximately 2.3GW of newly installed capacity. The global cumulative installed capacity has reached 9GW. The cumulative installed power of PV system in Korea tremendously increased to 74.7MW at the end of 2007. Up to Sep. 2008 The cumulative installed power of PV system in Korea is approximately 377MW. The value chain of photovoltaic in Korea is creating actively. Thus Korea is predicted to see 800MW of modules installed in 2010. Korea's renewable energy is also targeting to take 5% of the total energy consumption by 2011.