• Title/Summary/Keyword: maximum power point tracking(MPPT)

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Analysis of THD according to Output Power Fluctuation of Photovoltaic Generation System using Real Time Simulator (실시간 시뮬레이터를 이용한 태양광 발전 시스템의 출력 변동에 따른 THD 분석)

  • An, Hee-Jin;Seo, Hun-Chul;Kim, Chul-Hwan
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.61 no.3
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    • pp.361-366
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    • 2012
  • This paper analyzes the THD(Total Harmonics Distortion) according to output power fluctuation of photovoltaic(PV) systems using real time simulator. For being close to reality, the PV system including inverter and MPPT(Maximum Power Point Tracking) which composed of closed-loop using real-time simulator are modeled. The change of irradiance and temperature of PV module is modeled to consider the change of weather. The various simulations according to the weather conditions are performed and THD is calculated at each condition. In this paper, the results by off-line simulation are compared with the ones of real time simulation.

Power Quality Assessment and PSCAD/EMTDC Modeling of Grid-Connected PV System (계통연계형 태양광발전시스템의 PSCAD/EMTDC 모델링 및 전력품질 평가)

  • Seol, Jae-Woong;Jang, Jae-Jung;Kim, Jin-O
    • Proceedings of the KIEE Conference
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    • 2006.07b
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    • pp.1227-1228
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    • 2006
  • This paper presents the results of a grid-connected photovoltaic(PV) system modeling that contain incremental conductance MPPT(Maximum Power Point Tracking) controller by PSCAD/EMTDC simulator and investigates the influence that can occur in the grid-connected PV system from aspect of power quality, i.e. voltage drop, total harmonic distortion(THD) and total demand distortion(TDD). The measured data the PV array modeling of PSCAD/EMTDC in Cheongwadae, Seoul, Korea is used in the paper.

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Power Quality Assessment and PSCAD/EMTDC Modeling of Grid-Connected PV System (계통연계형 태양광발전시스템의 PSCAD/EMTDC 모델링 및 전력품질 평가)

  • Seol, Jae-Woong;Jang, Jae-Jung;Kim, Jin-O
    • Proceedings of the KIEE Conference
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    • 2006.07c
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    • pp.1687-1688
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    • 2006
  • This paper presents the results of a grid-connected photovoltaic (PV) system modeling that contain incremental conductance MPPT(Maximum Power Point Tracking) controller by PSCAD/EMTDC simulator and investigates the influence that tan occur in the grid-connected PV system from aspect of power quality, i.e. voltage drop, total harmonic distortion(THD) and total demand distortion(TDD). The measured data the PV array modeling of PSCAD/EMTDC in Cheongwadae, Seoul, Korea is used in the paper.

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Coordinated Droop Control for Stand-alone DC Micro-grid

  • Kim, Hyun-Jun;Lee, Yoon-Seok;Kim, Jae-Hyuk;Han, Byung-Moon
    • Journal of Electrical Engineering and Technology
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    • v.9 no.3
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    • pp.1072-1079
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    • 2014
  • This paper introduces a coordinated droop control for the stand-alone DC micro-grid, which is composed of photo-voltaic generator, wind power generator, engine generator, and battery storage with SOC (state of charge) management system. The operation of stand-alone DC micro-grid with the coordinated droop control was analyzed with computer simulation. Based on simulation results, a hardware simulator was built and tested to analyze the performance of proposed system. The developed simulation model and hardware simulator can be utilized to design the actual stand-alone DC micro-grid and to analyze its performance. The coordinated droop control can improve the reliability and efficiency of the stand-alone DC micro-grid.

Implementation and Characteristic Analysis of DC/DC Voltage Regulator for Operation Efficiency Improvement in PV system (태양광발전의 운용효율 향상을 위한 DC/DC 전압 레귤레이터의 구현 및 특성분석)

  • Kim, Chanhyeok;Choi, Sungsik;Kang, Minkwan;Jung, Youngmun;Rho, Daeseok
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.18 no.4
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    • pp.201-208
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    • 2017
  • Recently, the installation of photovoltaic(PV) systems has been increasing due to the worldwide interest in eco-friendly and abundant solar energy. On the other hand, a PV system has approximately 25% power loss while the energy generated from solar cells is transformed to the power coupling point through a power conversion system (DC/AC). If the output voltage of a string in the PV system is lower than the operating range of the inverter when a part of module in the string has a shadow due to weather conditions, the string is not synchronized and the whole efficiency of output power in a PV system may be reduced significantly. Therefore, to overcome this problem, this paper proposes a novel control method to compensate for the lower voltage by introducing a DC/DC voltage regulator for each string in a PV system, which adopts a concept for MPPT (Maximum Power Point Tracking) control function using the P&O algorithm and adopts constant voltage control method used in an existing inverter. This paper also implements a 2kW DC/DC voltage regulator based on the proposed algorithm and performs a variety of scenario-based experiments. From the simulation result, it was confirmed that the operation efficiency in the proposed method is improved compared to the existing method.

The development and operation characteristics analysis of PCS applied PV Output Senseless (POS) MPPT (PV Output Senseless (POS) MPPT 제어법이 적용된 단상 PCS 개발 및 운전특성 분석)

  • Lee, Seok-Ju;Park, Hae-Yong;Kim, Gyeong-Hun;Seo, Hyo-Ryong;Park, Min-Won;Yu, In-Keun
    • Proceedings of the KIEE Conference
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    • 2007.07a
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    • pp.226-227
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    • 2007
  • The purpose of this study for photovoltaic (PV) generation system is to keep the output power of photovoltaic cells maximized under any weather conditions. In a conventional MPPT (Maximum Power Point Tracking) control method, both voltage and current coming out from PV array have to be fedback. Thus, the system has a complex structure, and may fail to track MPP of PV array when unexpected weather conditions happen. This paper proposes a novel PV Output Senseless (POS) control method to solve the mentioned problem. The main advantage of this method is that the current flowing into load is the only one considerable factor. In case of a huge PV generation system, it can be operated much more safely than the conventional system. To verify this theory, results that compare and analyze the simulated data with experimental data under real weather condition of the manufactured PV generation system are shown in this paper. Authors vividly states that this theory uses constant resistors and variable resistors of DC-DC converter in PV system. Authors emphasize that it is a very useful method to maximize power from PV cells to load with only the feedback of load current. Authors also emphasize that this theory is applicable in case of the PCS in PV power generation system.

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High-Frequency DC Link Inverter for Grid-Connected Photovoltaic System (고주파링크방식을 이용한 PV용 PCS의 고찰)

  • Jung, Young-Seok;Yu, Gwon-Jong;Jung, Myoung-Woong;Choi, Jae-Ho;Choi, Ju-Yeop
    • Proceedings of the KIEE Conference
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    • 2002.07b
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    • pp.1313-1315
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    • 2002
  • This paper proposes an inverter for the grid-connected photovoltaic system based on the transformer-less inverter. This system consists of a high frequency inverter bridge, high frequency transformer, diode bridge rectifiers, a DC filter, a low frequency inverter bridge, and an AD filter. The high frequency inverter bridge switching at 20kHz is used to generate bipolar PWM pulse, which is subsequently rectified by diode bridge rectifiers to result in a full-wave rectified sine wave. Finally, it is unfolded by a low frequency inverter bridge to result in a 60Hz sine wave power output. In this paper, the control algorithm for synchronous current feedback control method and a maximum power point tracking (MPPT) method using DSP are described. And, the simulation and experimental results are shown to verify the validity of the proposed system.

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Realization of Digital control of Grid_connected Modular Photovoltaic Inverter (계통연계형 모듈형 태양광 인버터의 디지털 제어의 구현)

  • Lee, Seung min;Lee, Woo cheol
    • Proceedings of the KIPE Conference
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    • 2011.11a
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    • pp.287-288
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    • 2011
  • 주택 혹 산업용, 공공건물용으로 상용화 되어 있는 스트링 어레이 중앙 인버터 방식은 고압의 DC 배선으로 인한 안전문제, 고가의 고압 DC 차단기의 설치 및 과전압보호기 등으로 가격이 상승하게 되고 설치 시에도 패널간 균일 성능을 보장해야하고 스트링 상에 놓여 있는 패널 일부가 불량이거나 그림자가 져서 발전이 미비할 경우 전체 시스템 발전이 정지하거나 발전량이 미비해지는 문제가 생기므로 항상 최적의 상태로 운전할 수 없다. 그래서 이러한 태양광 발전 방식의 문제점을 해결하기 위해 각 모듈마다 마이크로 인버터를 장착하여 각각 패널마다 분산적인 MPPT(Maximum Power Point Tracking) 를 수행할 수 있고 DC 배선이 없기 때문에 시스템 설치비용을 획기적으로 절감할 수 있으며 안정성 문제도 중앙 인버터 방식보다 획기적으로 향상된다. 패널 또는 인버터 고장 시 전체 시스템의 차단 없이 교체가 가능 하여 시스템의 설비 이용률을 최대로 할 수 있다. 이러한 패널에 쓰이는 마이크로 인버터를 PSIM으로 구현하여 DLL로 통해 디지털 제어로 구현을 하고 시뮬레이션으로 통해 시스템의 효능을 알아보았다.

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The Photovoltaic Power Generation System with SEPIC-Flyback Converter (태양광 발전용 SEPIC-Flyback 컨버터)

  • Jung, Doo-Yong;Jang, Su-Jin;Ji, Yong-Hyuk;Won, Chung-Yuen;Jung, Yong-Chae
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2007.11a
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    • pp.49-52
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    • 2007
  • In this paper, we proposed a design photovoltaic generation systems with SEPIC-Flyback converter. The SEPIC-Flyback converter is operated to SEPIC converter the state turn-on of the switch and the state turn-off the switch is operated Flyback converter. Therefore application rate of the core increases and voltage stress of switch and transformer decreases with active clamp operation. Also we performed MPPT(Maximum Power Point Tracking) control for efficient working of Photovoltaic Dower generation system.

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The Study of Maximum Power Point Tracking Controller for the Wind Power Generator (풍력발전기용 최대전력점 추종제어기에 관한 연구)

  • Kang, Ju-Sung;Koh, Kang-Hoon;Han, Ho-Dong;Lee, Hyun-Woo
    • Proceedings of the KIEE Conference
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    • 2006.10d
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    • pp.155-157
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    • 2006
  • 현재 화석연료에만 의존하는 에너지 시장을 변화시키고자 하는 연구가 활발히 이루어지고 있는 가운데 신재생에너지(연료전지, 풍력, 태양광 등)를 복합적으로 활용한 분산전원시스템에 관한 관심이 증가하고 있다. 이 가운데 풍력 발전시스템은 발전효율, 가격측면 등에 있어 많이 연구되고 있다. 그러나 풍력발전시스템의 경우 난류가 되기 쉽고, 풍향이나 풍속이 수십초의 간격으로 변화하기 때문에, 바람의 에너지를 최대한 이용하는 최대전력점추종(MPPT)제어기의 역할이 가장 중요하다. 본 논문에서는 소형풍력발전기를 활용하여 풍속, 풍차 회전속도, 전력 등의 정보를 이용한 기존 방식에 비하여 아주 간단한 제어기법을 구현하고자 한다.

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