• Title/Summary/Keyword: PV(photovoltaic) generation system

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Analysis of Stability of PV System using the Eigenvalue according to the Frequency Variation and Requirements of Frequency Protection

  • Seo, Hun-Chul;Kim, Chul-Hwan
    • Journal of Electrical Engineering and Technology
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    • v.7 no.4
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    • pp.480-485
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    • 2012
  • Use of photovoltaic (PV) power generation system will become more widespread in the future due to anticipated cost reduction in PV technology. As the capacity of PV systems increases, a variation of power system frequency may prevent the stable output of PV system. However, the standard for the frequency protection of distributed generation in Korea Electric Power Corporation (KEPCO)'s rule does not include the setting of frequency protection. Therefore, this paper analyzes the correlation between the frequency protection requirements and the stability of grid-connected PV system for the adjustable operating setting of frequency protection. The distribution system interconnected with 3 MW PV system is modeled by Matlab/Simulink. The various values of frequency are simulated. For studied cases, the stability of PV system is analyzed. It is concluded that the setting of frequency protection is necessary to consider the stability of PV system.

Field Test Study of Photovoltaic Generation System for Medium and Small-Sized Buildings (중소형 건물 태양광발전시스템의 실증 연구)

  • Kim, Eung-Sang;Kim, Seul-Ki
    • 한국신재생에너지학회:학술대회논문집
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    • 2006.11a
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    • pp.561-565
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    • 2006
  • The paper presents a method of assessing the adequate tapaclty of photovoltaic generation systems for public buildings based on analysis of load variation patterns of customers. When PV systems are installed for supplying power for the customer load, reverse power relay is required by the guideline to be installed at the point of common coupling with the power network. The suggested method analyzes daily, weekly and monthly load demand of the customer that Irishes PV system installation, and determines the appropriate rating of the PV system for preventing PV generation from exceeding the customer demand. This work is expected to support renewable energy dissemination projects of public organizations.

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Output Control Simulation of PV-AF Generation System under Various Weather Conditions (다양한 기상조건하에서의 AF기능을 갖는 태양광발전시스템의 출력제어 시뮬레이션)

  • Seong, Nak-Gueon;Park, Min-Won;Yu, In-Keun
    • Proceedings of the KIEE Conference
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    • 2002.07b
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    • pp.1364-1366
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    • 2002
  • The Photovoltaic(PV) generation system is a promising source of energy for the future. Since the need for renewable energy has been increased, the research of PV generation system has also been progressed. Recently, cost down of PV generation system has been accomplished and practical technologies of the solar energy developed, Moreover, grid connected PV generation system are becoming actual and general. Operational technology of the grid connected PV generation system is being a hot issue. Power output of PV system is directly affected by wether conditions. When AC power supply is needed, power conversion by an inverter and a MPPT control are necessary. In this paper, for stability improvement of PV generation system. Active filter(AF) function is added to PV generation system, and simulations of PV-AF system under various weather conditions are performed.

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Photovoltaic System Output Forecasting by Solar Cell Conversion Efficiency Revision Factors (태양전지 변환효율 보정계수 도입에 의한 태양발전시스템 발전량 예측)

  • Lee Il-Ryong;Bae In-Su;Shim Hun;Kim Jin-O
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.54 no.4
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    • pp.188-194
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    • 2005
  • There are many factors that affect on the system output of Photovoltaic(PV) power generation; the variation of solar radiation, temperature, energy conversion efficiency of solar cell etc. This paper suggests a methodology for calculation of PV generation output using the probability distribution function of irradiance, PV array efficiency and revision factors of solar cell conversion efficiency. Long-term irradiance data recorded every hour of the day for 11 years were used. For goodness-fit test, several distribution (unctions are tested by Kolmogorov-Smirnov(K-S) method. The calculated generation output with or without revision factors of conversion efficiency is compared with that of CMS (Centered Monitoring System), which can monitor PV generation output of each PV generation site.

Demonstration Research of Photovoltaic System with Solar Reflectors (반사판을 이용한 태양광발전시스템 실증연구)

  • Kim, Yong-Sik;Kang, Gi-Hwan;Sim, Sang-Yong;Lee, Hoo-Rock;Lee, Jin-Seob;Hong, Jin-Ki
    • Journal of the Korean Solar Energy Society
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    • v.29 no.1
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    • pp.64-69
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    • 2009
  • This paper aims at enhancing the electric production efficiency of photovoltaic(PV) system. The electrical power of PV system is proportional to light intensity on a PV module surface. In this paper, we apply two types of systems to enhance power generation efficiency. First, of all, concentring sunlight using specular surface and one-axis tracking system which traces the sun with vertical direction are applied in this project. From this, we analyze the fixed type method and power generation efficiency.

The Long-term Operating Evaluation of the Grid Connected Photovoltaic System (태양광발전시스템의 장기운전에 의한 성능특성 분석)

  • Kim, Eui-Hwan;Kang, Seng-Won;Kim, Jae-Eon
    • New & Renewable Energy
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    • v.7 no.2
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    • pp.28-35
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    • 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.

PSCAD/EMTDC Based Modeling and Simulation Analysis of a Grid-Connected Photovoltaic Generation System (PSCAD/EMTDC를 미용한 계통연계형 태양광발전시스템의 모델링 및 모의 해석)

  • Jeon Jin-Hong;Kim Eung-Sang;Kim Seul-Ki
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.54 no.3
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    • pp.107-116
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    • 2005
  • The paper addresses modeling and analysis of a grid-connected photovoltaic generation system (PV system). PSCAD/EMTDC, an industry standard simulation tool for studying the transient behavior of electric power system and apparatus, is used to conduct all aspects of model implementation and to carry out extensive simulation study. This paper is aimed at sharing with the PSCAD/EMTDC user community our user-defined model for PV system applications, which is not yet available as a standard model within PSCAD/EMTDC. An equivalent circuit model of a solar cell has been used for modeling solar array. A series of parameters required for array modeling have been estimated from general specification data of a solar module. A PWM voltage source inverter (VSI) and its current control scheme have been implemented. A maximum power point tracking (MPPT) technique is employed for drawing the maximum available energy from the PV array. Comprehensive simulation results are presented to examine PV array behaviors and PV system control performance in response to irradiation changes. In addition, dynamic responses of PV array and system to network fault conditions are simulated and analysed.

A Matlab/Simulink-Based PV array-Supercapacitor Model Employing SimPowerSystem and Stateflow Tool Box

  • Hong, Won-Pyo
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.28 no.12
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    • pp.18-29
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    • 2014
  • This paper proposes the integration of photovoltaic (PV) and energy storage systems for sustained power generation. In this proposed system, whenever the PV system cannot completely meet load demands, the super capacitor provides power to meet the remaining load. A power management strategy is designed for the proposed system to manage power flows between PV array systems and supercapacitors (SC). The main task of this study was to design PV systems with storage strategies including MPPT with direct control and an advanced DC-link controller and to analyze dynamic model proposed for a PV-SC hybrid power generation system. In this paper, the simulation models for the hybrid energy system are developed using Matlab/Simulink, SimPowerSystems and Matlab/Stateflow tool. This is the key innovative contribution of the research paper. The system performances are verified by carrying out simulation studies using practical load demand profile and real weather data.

Performance of Wind-Photovoltaic Hybrid Generation System

  • Oh Jin-Seok
    • Journal of Advanced Marine Engineering and Technology
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    • v.29 no.3
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    • pp.319-324
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    • 2005
  • This paper reports the performance of Wind-PV(Photovoltaic) hybrid system. The output power of PV is affected by the environmental factors such as solar radiation and cell temperature. Also, the output power of wind system is generated with wind power. Integration of Wind and PV resources, which are generally complementary, usually reduce the capacity of the battery. This paper includes discussion on system reliability, power quality and effects of the randomness of the wind and the solar radiation on system design.

Fluctuating Reduction Method for Generation Power of the Wind-PV Hybrid System

  • Oh, Jin-Seok;Lee, Ji-Young
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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    • v.4B no.2
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    • pp.80-85
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    • 2004
  • This paper reports the performance of a CB (Circuit Breaker) and converter for the battery operated Wind-PV (Photovoltaic) system. For this purpose, a fluctuating reduction controller for an electric generation hybrid (wind+PV) system is suggested. The method operates a wind turbine, PV, CB, converter and battery. Integration of wind and PV sources, which are generally complementary, usually reduce the capacity of the battery. Also, CB controls the overvoltage of the generation system. The objective is to control the operation of the converter and the CB and reduce power fluctuation. This paper includes discussion on system performance, power quality, fluctuation and effect of the randomness of the wind.