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  • Title/Summary/Keyword: A photovoltaic system

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Generation Characteristic of WEC for Buoy (브이용 파력발전시스템의 발전특성)

  • Oh, Jin-Seok;Kwak, Jun-Ho;Bae, Soo-Young;Jung, Sung-Young;Lee, Ji-Young
    • Journal of Advanced Marine Engineering and Technology
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    • v.32 no.8
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    • pp.1123-1128
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    • 2008
  • Marine facilities like buoy, lighthouse are operated with stand alone power supply system. This power system can consist of a stand-alone type power system such as PV(Photovoltaic) system, wave system or hybrid system which is not cooperated with a commercial power system. Generally, PV power system for marine facilities can not supply a sufficient power to buoy, because it is so influenced from weather condition. For solving this problem the hybrid power system with PV and wave is studied on a various area, that is why a hybrid power system is requires to overcome these problems. This paper will describe a generation characteristic of WEC(Wave Energy Converter) for buoy, and an AFS(Anti-Fouling System) influence on WEC.

Characterization of Light Effect on Photovoltaic Property of Poly-Si Solar Cell by Using Photoconductive Atomic Force Microscopy (Photoconductive Atomic Force Microscopy를 이용한 빛의 세기 및 파장의 변화에 따른 폴리실리콘 태양전지의 광전특성 분석)

  • Heo, Jinhee
    • Korean Journal of Materials Research
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    • v.28 no.11
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    • pp.680-684
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    • 2018
  • We investigate the effect of light intensity and wavelength of a solar cell device using photoconductive atomic force microscopy(PC-AFM). A POCl3 diffusion doping process is used to produce a p-n junction solar cell device based on a polySi wafer, and the electrical properties of prepared solar cells are measured using a solar cell simulator system. The measured open circuit voltage(Voc) is 0.59 V and the short circuit current(Isc) is 48.5 mA. Moreover, the values of the fill factors and efficiencies of the devices are 0.7 and approximately 13.6 %, respectively. In addition, PC-AFM, a recent notable method for nano-scale characterization of photovoltaic elements, is used for direct measurements of photoelectric characteristics in limited areas instead of large areas. The effects of changes in the intensity and wavelength of light shining on the element on the photoelectric characteristics are observed. Results obtained through PC-AFM are compared with the electric/optical characteristics data obtained through a solar simulator. The voltage($V_{PC-AFM}$) at which the current is 0 A in the I-V characteristic curves increases sharply up to 18W/m2, peaking and slowly falling as light intensity increases. Here, VPCAFM at 18W/m2 is 0.29 V, which corresponds to 59 % of the average Voc value, as measured with the solar simulator. Furthermore, while the light wavelength increases from 300 nm to 1,100 nm, the external quantum efficiency(EQE) and results from PC-AFM show similar trends at the macro scale but reveal different results in several sections, indicating the need for detailed analysis and improvement in the future.

A Contactless Power Supply for a DC Power Service

  • Kim, Eun-Soo;Kim, Yoon-Ho
    • Journal of international Conference on Electrical Machines and Systems
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    • v.1 no.4
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    • pp.483-491
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    • 2012
  • It is expected that, in the future, DC power service will be widely used for photovoltaic home power generation systems, since DC consuming devices are ever increasing. Instead of using multiple converters to convert DC to AC and then AC to DC, the power service could solely be based on DC. This would eliminate the need for converters, reducing the cost, complexity, and possibly increasing the efficiency. However, configuration of direct DC power service with mechanical contacts can cause spark voltage or an electric shock when the switch is turned on and off. To solve these problems, in this paper, a contactless power supply for a DC power service that can transfer electric power produced by photovoltaics to the home electric system using magnetic coupling instead of mechanical contacts has been proposed. The proposed system consists of a ZVS boost converter, a half-bridge LLC resonant converter, and a contactless transformer. This proposed contactless system eliminates the use of DC switches. To reduce the stress and loss of the boost converter switching devices, a lossless snubber with coupled inductor is applied. In this paper, a switching frequency control technique using the contactless voltage sensing circuit is also proposed and implemented for the output voltage control instead of using additional power regulators. Finally, a prototype consisted of 150W boost converter has been designed and built to demonstrate the feasibility of the proposed contactless photovoltaic DC power service. Experimental results show that 74~83% overall system efficiency is obtained for the 10W~80W load.

A study on advanced PV operation algorithm to improve the PV Power-Hardware-In-Loop Simulator (PV PHIL-시뮬레이터의 성능 개선을 위한 최적의 운영제어 알고리즘 연구)

  • Kim, Dae-Jin;Kim, Byungki;Ko, Hee-Sang;Jang, Moon-Seok;Ryu, Kyung-Sang
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.18 no.9
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    • pp.444-453
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    • 2017
  • This paper proposes an operational algorithm for a Photovoltaic Power-Hardware-In-Loop Simulator that is designed to improve the control algorithm and reliability of the PV Inverter. There was an instability problem in the PV PHILS with the conventional algorithm when it was connected tothe PV inverter. Initially, a real-time based computing unit with mathematical modeling of the PV array is implemented and a DC amplifier and an isolated device for DC power measurement are integrated. Several experiments were performed based on theabove concept undercertain conditions, which showed that the proposed algorithm is more effective for the PV characteristic test and grid evaluation test than the conventional method.

Development of Hybrid Device for Photovoltaic Power Generation and Heating (복합식 태양광 발전 및 난방장치 개발)

  • Lee, Dong Il;Baek, Seung Wook
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.38 no.11
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    • pp.907-914
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    • 2014
  • The objective of this study was to increase the generating efficiency of concentrated photovoltaics (CPV) by using hybrid solar tracking. Further, the proposed system was demonstrated to have the ability to extract thermal energy from a concentrated photovoltaic system by using thermal absorbers containing heat pipe, which could then be used for a heating system or hot-water supply. The average electrical efficiency was 16 during the day, and the average thermal efficiency was 62. Therefore, this system demonstrated a total efficiency (electrical thermal) of 78. All the processes, i.e., tracking of the sun, calculation of the sun's position, reinstatement of the heating device toward the east for tracking on the next day, and system shutdown, were programmed using Simulink. A parametric analysis of the heat pipe, concentration ratio, and inlet velocity was also performed in terms of the operating temperature of the CPV and the outlet temperature. The simulation and experimental results for the thermal absorber were found to be in good agreement.

Analysis results of the Anti-islanding Function for PV-AF System (액티브 필터기능을 갖는 3상 태양광 발전시스템의 단독운전 방지기능의 분석)

  • Kim, Gyeong-Hun;Seo, Hyo-Ryong;Jang, Seong-Jae;Park, Sang-Soo;Park, Min-Won;Yu, In-Keun;Jeon, Jin-Hong;Kim, Seul-Ki;Jo, Chang-Hee;Ahn, Jong-Bo
    • Proceedings of the KIEE Conference
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    • 2008.07a
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    • pp.1085-1086
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    • 2008
  • Shunt active filter can compensate harmonic current of utility results from non-linear loads such as rectifiers, cycloconverters and arc furnaces. It has the same structure as photovoltaic(PV) generation system. So, It was proposed the system that generates PV power and also has active filter function. It is called PV-AF(Photovoltaic and Active Filter) power generation system. Islanding can be occurred in an inverter based dispersed generation system, when the system disconnected from utility and loads are entirely supplied by PV system only. Islanding may result in interference to grid protection devices, equipment damage, and even personnel safety hazards. Therefore, islanding has to be detected and protected. The conventional anti-islanding methods have NDZ(None-Detection Zone) or power quality degradation. But PV-AF power generation system has the function of not only shunt active filter but also anti-islanding method without NDZ. In this paper, a novel anti-islanding method for PV-AF system is proposed and analysed in detail.

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Characterization of Wavelength Effect on Photovoltaic Property of Poly-Si Solar Cell Using Photoconductive Atomic Force Microscopy (PC-AFM)

  • Heo, Jinhee
    • Transactions on Electrical and Electronic Materials
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    • v.14 no.3
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    • pp.160-163
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    • 2013
  • We investigated the effect of light intensity and wavelength of a solar cell device by using photoconductive atomic force microscopy (PC-AFM). The POCl3 diffusion doping process was used to produce a p-n junction solar cell device based on a Poly-Si wafer and the electrical properties of prepared solar cells were measured using a solar cell simulator system. The measured open circuit voltage (Voc) is 0.59 V and the short circuit current (Isc) is 48.5 mA. Also, the values of the fill factors and efficiencies of the devices are 0.7% and approximately 13.6%, respectively. In addition, PC-AFM, a recent notable method for nano-scale characterization of photovoltaic elements, was used for direct measurements of photoelectric characteristics in local instead of large areas. The effects of changes in the intensity and wavelength of light shining on the element on the photoelectric characteristics were observed. Results obtained through PC-AFM were compared with the electric/optical characteristics data obtained through a solar simulator. The voltage (VPCAFM) at which the current was 0 A in the I-V characteristic curves increased sharply up to 1.8 mW/cm2, peaking and slowly falling as light intensity increased. Here, VPCAFM at 1.8 mW/cm2 was 0.29 V, which corresponds to 59% of the average Voc value, as measured with the solar simulator. Also, while light wavelength was increased from 300 nm to 1,100 nm, the external quantum efficiency (EQE) and results from PC-AFM showed similar trends at the macro scale, but returned different results in several sections, indicating the need for detailed analysis and improvement in the future.

Design of Simulated Photovoltaic Power Streetlight for Education using Renewable Energy Utilization and Storage Function (신재생에너지 활용 및 저장기능을 이용한 교육용 모의 태양광발전 가로등 설계)

  • Yoon, Yongho
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.21 no.2
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    • pp.137-142
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    • 2021
  • A Photovoltaic power streetlight is a system that uses solar energy to charge a secondary battery and then uses it for night lighting through a lamp, and can be configured as a standalone or grid-connected type by installing an LED streetlight at the load end. The energy generated through the solar cell module can be charged to the secondary battery through the charge/discharge control device, and then the LED street light can be turned on and off by comparing the power generation voltage and the charging voltage according to the monitoring of solar radiation, or by setting a specific time after sunset or sunrise. Based on these contents, this paper designed and manufactured a simulated solar power streetlight for education using new and renewable energy utilization and storage functions. Using these educational equipment, students can 1) understand the flow of energy change using renewable energy including sunlight as electric energy, 2) understand new and renewable energy, and cultivate basic design and manufacturing application power of related products, 3) The use of new and renewable energy through power conversion and strengthening of practical training and analysis through hardware production can be instilled.

A Study on The Virtuous Cycle of The Value Chain and Value System in Korean Photovoltaic Industry (한국 태양광산업의 가치사슬과 가치시스템 선순환 구조 분석)

  • Park, Sung-Hwan;Park, Min-Hyug;Park, Jung-Gu
    • Journal of Energy Engineering
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    • v.23 no.1
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    • pp.21-32
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    • 2014
  • This study has analyzed whether the virtuous cycle of value-added between the processes within the company has formed and whether the virtuous ecosystem between the processes within the industry has been built through the analysis of value chain(VC) and value system(VS) targeting the Korean photovoltaic companies. For a study method, after conducting a survey on the companies, a regression analysis was performed on the causal relationship between the process within the VC and VS. Based on the results of the analysis, for the VC of the Korean photovoltaic industry, an increase in the R&D support from the government has led to the increase in the investment of R&D for the related industry, and the increase in the investment of R&D has contributed to the increase in the growth of its productivity, and the growth in the productivity of R&D has influenced the increase in the production of solar products. In addition, the reduction of photovoltaic production cost for the company has influenced the increase of recurring profit margin compared to the sales. However it was shown that the increase in the company's production volume does not contribute to the reduction of production cost. Meanwhile, the increase in recurring profit margin compared to the sales were influencing the increase in the production volume but it was shown that the increase in the company's investment of R&D was not a contributing factor thus it was not included in the virtuous cycle. It was analyzed that the VS was shown not to influence all other processes within the industry except for the module companies where the increase in the recurring profit margin compared to the sales was influenced by the increase in the recurring profit margin compared to the sales of solar cell companies. This shows that the virtuous industrial ecosystem which should be made under the mutual cooperation by the ingot, wafer, solar cell, module and system companies are yet incomplete.

High Utilization of Photovoltaic Power System in Rural Green Village Location Analysis and Evaluation using GIS - With Chubumyeon, Keumsan, Chungnam province - (GIS를 이용한 태양광 발전시스템의 활용도 높은 농촌 그린빌리지 적정입지 평가 - 충청남도 금산군 추부면을 중심으로 -)

  • Doh, Jae-Heung;Kim, Dae-Sik;Koo, Hee-Dong
    • Journal of Korean Society of Rural Planning
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    • v.20 no.1
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    • pp.51-62
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    • 2014
  • The composition of rural Green Village requires higher utilization of renewable energy in those selected rural villages. The purpose of this study is to select the best results of rural green villages when using photovoltaic power system(PV system). 10 different rural villages in Chubumyeon, Keumsan, Chungnam province, were selected as study villages. This study shows measured solar radiation data, a 20-year time series data, and GIS spatial analysis; and whose were used to predict the photovoltaic power generation. PV system is used as a form with capacity of 3kWp to use for personal and public houses. Generation data was calculated by the town, where the economics of the Green Village location analysis was performed; and the solar radiation's correction factor was calculated by the 20-year time series data and measured data by study villages. By applying to the data of DEM, slope and aspect of the study villages were found, therefore performed. Spatial analysis tools were performed by using solar radiation map's tools. Those data found were used to calculate the average needed energy every months. When used the properly calculated data, towns performed economical energy consumption in rural Green Village. Every study villages have showed very high potential for PV system. Sungdangri ranked at the first (7,401kWp/year), Jangdaeri follows behind to the second (7,203kWp/year) and Yogwangri at third (7,89kWp/year) which shows higher developed energy than other study villages. The areas covered of these three towns are as follows: Sungdangri at 33,300m2, Jangdaeri covers 18,000m2 and Yogwangri shows 46,800m2. With these results, analyzing the potentials using GIS spatial analysis before installation of PV system was possible. Also different villages and topography in study villages have showed various results by the area. For convenience and to shorten research time, it is possible and enough to use solar radiation tools when studying spatial analysis of solar radiation.