• 한국신재생에너지학회:학술대회논문집
• /
• 한국신재생에너지학회 2005년도 제17회 워크샵 및 추계학술대회
• /
• pp.665-665
• /
• 2005

The existing DSP for utility interactive photovoltaic generation system control generally uses floating point process type. Because it is easy to use for number crunching, however, it is too late and too expensive. Fixed point process DSP TMS320F2812, has high control speed and is rather inexpensive. A very complicated real system can be simulated using hardware-in-the-loop (HIL) system in a virtual environment Therefore, HIL system can speed up research and development process with a little effort. Also current DSP for utility interactive photovoltaic generation system adopts floating point process type, which is easy to use for number crunching. However, fixed point process DSF, TMS320F2812, has high control speed and is rather inexpensive. This paper presents more efficient method for MPPT control using TMS320F2812 along with HIL System.

• 전기학회논문지
• /
• 제66권3호
• /
• pp.486-492
• /
• 2017

In recent years, renewable energy sources have been mentioned as solution to environmental regulation and energy supply-demand. Energy storage systems are needed to mitigate the intermittent output characteristics of renewable energy sources and to operate micro grid efficiently using renewable energy generation systems. However, despite the necessity of energy storage system, this cannot secure the economical efficiency of the energy storage system by high initial cost. In this paper, a micro grid is constructed to supply electric power to industrial customers by using solar power generation system and energy storage system among renewable energy generation power sources and operated to improve energy independence. In the case study, we use photovoltaic system which is representative renewable energy generation system. Unlike conventional photovoltaic system, this system uses floating photovoltaic system with the advantage of having high output and no land area limitations. It is operated for the purpose of improving energy independence in the micro grid. In order to secure economical efficiency, the energy storage system operates a micro grid with a minimum capacity. Finally, this paper calculates the appropriate subsidy for the energy storage capacity.

• Current Photovoltaic Research
• /
• 제8권3호
• /
• pp.67-78
• /
• 2020

A novel energy production system which has fascinated a wide consideration because of its several benefits that are called floating photovoltaic technology (FPVT). The FPVT system that helps to minimize the evaporation of water as well as an increase in energy production. For the research purposes, both electrical and mechanical structure requires studying of these systems for the development of FPVT power plants. From different points of views, numerous researches have been directed on FPVT systems that have evaluated these systems. The present research article give a logical investigation and up to date review that shows the different features and components of FPVT systems as an energy production system is offered. This articles reviewing the FPVT that gets the attention of the scientists who have the investigational stage and involuntary inspection of FPVT systems in addition to influence of implementing these systems on the water surface. Also, a comprehensive comparison has been constructed that shows the cons and pros of various types of solar systems that could be installed in various locations. In this review, it has been found that solar energy on the roof of a dwelling house generally has a power of 5 to 20 kW, while the inhabitants of commercial buildings generally have a power of 100 kW or more. The average power capacity of a floating solar panel is 11% more of the average capacity of a solar panel installed on the ground. Studies show that 40% of the water in open reservoirs is lost through evaporation. By covering only 30% of the water surface, evaporation can be reduced by 49%. The global solar panel market exceeds 100 GW and the capacity of 104 GW will bring the annual growth rate to 6%. In 2018, the world's total photovoltaic capacity reached 512 GW, an increase of 27% compared to the total capacity and about 55% of the renewable resources newly created that come from photovoltaic systems. It has been also predicted by this review that in 2025 the Solar technology including the FPVT system will increase by 7.38% that is 485.4 GW more of today installed power worldwide.

• 대한공간정보학회지
• /
• 제24권1호
• /
• pp.51-59
• /
• 2016

전 세계 화석 에너지의 사용량은 지속적으로 증가하고 있다. 기존의 화석 에너지 사용 국가뿐만 아니라 개발도상국의 화석 에너지 사용량 또한 증대되면서 유한한 화석 에너지의 고갈에 대한 불안감은 커지고 있다. 또한 화석에너지로 인한 환경오염, 경제적 사회적 문제는 해결해야 할 과제로 남아있다. 태양광은 환경을 해치지 않는 청정에너지이지만, 태양광 발전소를 설치하는 과정에서 여러 문제가 발생한다. 이러한 문제점들을 해결하기 위해 수상 태양광 발전소가 대안으로 떠오르고 있다. 하지만 아직까지 수상 태양광 발전소에 대한 입지 분석이 이루어지지 않고 있다. 본 연구에서는 수상 태양광 발전소의 입지 조건을 지형 및 기후 인자를 이용한 계층분석법을 통해 결과를 분석하였다. 그리고 적합분류표에 따라 각각 인자들의 속성정보에 점수를 부여하고, 여기에 가중치를 곱한 뒤 점수를 시각화하여 분석하였다. 그 결과 경상북도 북부지역의 점수 분포가 남부지역보다 높게 나왔다. 특히 안동시의 안동호와 영양군의 저수지가 최적입지로 추출되었다. 낮은 점수가 나온 곳은 강, 하천의 중심부가 아닌 하천의 경계면이었다. 본 연구를 통해 더욱 정확한 수상 태양광 발전소 입지 분석이 될 것이라고 기대한다.

• 신재생에너지
• /
• 제16권1호
• /
• pp.47-57
• /
• 2020

In Floating PV (Photovoltaic) systems, PV modules are installed on water by utilizing the surface of idle water such as a reservoir and multipurpose dam. A floating PV system, therefore, has the advantage of efficiency in national land use and improved energy yield owing to cooling effect compared to on-land PV systems. Owing to the limitation of installation environment for a floating PV system, the system, however, has the disadvantage of an increase in transmission distance of DC (Direct current) cables. A longer transmission distance of a DC cable results in greater power loss due to a voltage drop. This leads to a decline in economic feasibility for the floating PV system. In this paper, the economic analysis for 10 floating PV systems installed in a reservoir has been conducted in terms of a change in annual power sales according to the variation of transmission losses depending on the factors affecting the voltage drop, such as transmission distance, cross-section area of underwater cable, the presence of joint box, and PV capacity.

• 한국산학기술학회논문지
• /
• 제15권4호
• /
• pp.2343-2348
• /
• 2014

지락사고 시 지락전류에 의한 전위경도 상승으로부터 인체를 보호하기 위하여 발전소의 주 접지망을 구성한다. 이를 위한 접지설계시 일반적으로 IEEE Std-80-2000(한전설계기준 2602)에 의하여 계산한다. 그러나 이는 수상환경에서 적용하기 힘들어 수상태양광의 접지저항 확보를 위한 접지기술이 명확하지 않다. 그런데 500kW 수상태양광의 모듈표면 및 금속덕트에 정전기가 발생하고 있고, 안정적인 접지확보를 위해서는 수상환경의 접지방식에 대한 구체적인 방안이 필요한 실정이다. 따라서 본 논문에서는 수상환경에서 Wenner 4 전극법으로 대지저항률을 조사.분석하였으며, 현재 운영중인 수상태양광의 접지저항을 국제규격(IEEE std-81)에서 제시하는 전압강하법으로 측정 분석하여 안정적인 접지확보를 위한 수상태양광 접지방안을 제시하였다. 수면 1m 수중의 저항률이 ($126.3969[{\Omega}{\cdot}m]$) 하상의 저항률($97.5713[{\Omega}{\cdot}m]$)보다 대체로 높은 것을 측정 분석되었고, 제시한 접지앵커 접지방안은 수상태양광의 더욱 안정된 접지저항 확보를 위해 경제적으로 가장 효과적인 방법으로 판단되며, 향후 수상태양광 발전의 접지방법으로 활용될 것으로 기대된다.

• 한국산업융합학회 논문집
• /
• 제17권4호
• /
• pp.227-233
• /
• 2014

Information presented in this study is intended to inform candidates as they prepare to design and structure the floatovoltaics solar power system. A developed floatovoltaics solar power generation results from the combination of PV plant technology and PV floating technology. This floating-based PV system is a new concept for PV development. The PV floating technology opens new opportunities to give value to unused areas so far while preserving valuable land for more adapted activities. Therefore the land-use conflicts are avoided and the environmental impact is minimized. Therefore the technology offers an interesting opportunity to regions facing on drought during summer time without any negative impact to the eco-system. This study describe the basic components of a floatovoltaics solar power system. A typical system consist of floating system and solar modules, a control device, rechargeable batteries, a load or device and the associated electrical connections. The floating system is specifically designed to keep all metallic components above water leaving only 100% recyclable, closed cell foam filled HDPE plastic floats in contact with the water. As the first case that can maximize the power generation efficiency of PV internationally, it is expected that this study will be utilized as a primary guide for future development of floating type PV system.

• International Journal of Ocean System Engineering
• /
• 제1권3호
• /
• pp.171-179
• /
• 2011

This paper presents the concept design procedure of a floating-type combined renewable energy platform based on hydrodynamic analyses and is focused on the fatigue design of taut-type mooring lines of the platform. Two types of combined renewable energy platforms are considered: a combination of wind turbine, wave turbine and photovoltaic energy plant and a combination of wind turbine, current turbine and photovoltaic energy plant. The basic configurations are conceptually determined from the understanding of floating offshore plants, while the main dimensions have been determined based on a hydrostatic calculation. Fully coupled hydrodynamic analyses have been carried out to identify the motion characteristics of the floating body and the tension histories of the mooring lines. The tension history is used for the fatigue life prediction based on the rain-flow cycle counting method. For the fatigue life prediction, tension life curves from API and the Palmgren-Miner rule are employed.

• 신재생에너지
• /
• 제9권1호
• /
• pp.60-68
• /
• 2013

In recent years, green house effect related natural disasters occur throughout the world. Carbon dioxide, mainly comes from the fossil fuel burning, is suspected to be the cause of green house effect. To reduce the emission of carbon dioxide, we need to find alternative energy resources such as photovoltaic energy. In this paper, the basic characteristics of wind force coefficient on a PV panel installed on the floating type PV energy generation system are investigated though the two-dimensional wind tunnel tests. Test variables included the angle of PV panel, direction of wind, number of rows of PV panel and attached or not attached frame. Based on the results obtained through the wind tunnel tests, it was found that the wind force coefficient can be used as a preliminary data in the design of the structure.

• 복합신소재구조학회지
• /
• 제4권4호
• /
• pp.31-39
• /
• 2013