• Document: A Study on Power Generation Analysis of Floating PV System Considering Environmental Impact
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International Journal of Software Engineering and Its Applications Vol.8, No.1 (2014), pp.75-84 http://dx.doi.org/10.14257/ijseia.2014.8.1.07 A Study on Power Generation Analysis of Floating PV System Considering Environmental Impact Young-Kwan Choi * K-water(Korea Water Resources Corporation), Republic of Korea * corresponding author: music@kwater.or.kr Abstract The floating photovoltaic system is a new concept in energy technology to meet the needs of our time. The system integrates existing land based photovoltaic technology with a newly developed floating photovoltaic technology. Because module temperature of floating PV system is lower than that of overland PV system, the floating PV system has 11% better generation efficiency than overland PV system. In the thesis, superiority of floating PV system is verified through comparison analysis of generation amount by 2.4kW, 100kW and 500kW floating PV system installed by K-water and the cause of such superiority was analyzed. Also, effect of wind speed, and waves on floating PV system structure was measured to analyze the effect of the environment on floating PV system generation efficiency. Keywords: floating photovoltaic system, PV generation efficiency 1. Introduction Recently, the market for solar-energy is expanding due to introduction of the RPS (Renewable Portfolio Standard). Thus, vigorous research is held on alternatives against the lack of sites to install overland PV systems. The floating PV system demonstrated in this paper is a new method of solar-energy generation utilizing water surface available on dams, reservoirs, and other bodies of water. This method has an advantage that allows efficient use of the nation’s soil without bringing damages to the environment, which the pre-existing PV systems cause when it is installed in farmlands or forests. Until 2012, Korea applied REC(Renewable Energy Certificate) value of 1.0 to floating PV systems similar to general PV systems. However, recognizing the technological value and necessity of floating PV systems, Korea has announced that the REC value will be 1.5 for floating PV systems, the same value as BIPV(Building Integrated Photovoltaic System), from year 2013. This paper will briefly introduce the 100kW and 500kW floating PV systems which K-water developed and installed, and analyze its utility compared with overland PV systems on the basis of its generation performance since its installation. Also, effect of wind speed, and waves on floating PV system structure was measured to analyze the effect of the environment on floating PV system generation efficiency. 2. Characteristics of Floating PV System 2.1. Concept of Floating PV System A developed PV floating power generation results from the combination of PV plant technology and floating technology. This fusion is a new concept for technology ISSN: 1738-9984 IJSEIA Copyright ⓒ 2014 SERSC International Journal of Software Engineering and Its Applications Vol.8, No.1 (2014) development. As a new generation technology, it can replace the existing PV plants that are installed on top of woodland, farmland and buildings. The PV floating plant consists of a floating system, mooring system, PV system and underwater cables. Figure 1. PV Floating Plants Outline a. Floating System: A floating body (Structure + Floater) that allows the installation of the PV module b. Mooring System: Can adjust to water level fluctuations while maintaining its position in a southward direction c. PV System: PV generation equipment, similar to electrical junction boxes, that are installed on top of the floating system d. Underwater Cable: Transfers the generated power from land to the PV system 2.2. K-water 100kW, 500kW Floating PV Systems K-water has installed a 100kW floating PV system on the water surface of Hapcheon dam reservoir in October 2011 for operation. After successfully installing the 100kW floating PV system, K-water additionally installed a 500kW floating PV system on another location nearby in July 2012. The electricity generated by the two floating PV systems installed in Hapcheon dam reservoir are generating profits by being sold to the national power grid. Figure 2 displays the view of the 100kW and 500kW floating PV systems. (a) 100kW (b) 500kW Figure 2. K-water PV Floating Plants Outline 3. Performance Analysis of Floating PV System 3.1. 100kW Floating PV System The 100kW floating PV system in Hapcheon is forming a 33° tilt and its installed capacity is 99.36kW, composed of 414 240W modules. Figure 3 represents the generation quantity and capacity factor of the Hapcheon 100kW floating PV system based on the

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