• Title/Summary/Keyword: Photovoltaic arrays

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Control of a Novel PV Tracking System Considering the Shadow Influence (그림자 영향을 고려한 새로운 태양광 추적시스템 제어)

  • Park, Ki-Tae;Choi, Jung-Sik;Chung, Dong-Hwa
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.6
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    • pp.994-1002
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    • 2008
  • In this paper a novel tracking system is described, regarding the influence of shadow between array, aimed at improving the efficiency of PV tracking system. Comparing with a building site versus capacity power, domestic solar powers have a limited siting. Therefore, each array interferes with the shadow of other arrays. The loss by influence of those shadow can be compensated for by means of control algorithm of the tracking device. The paper suggests a method controlling an altitude for length which is received the shadow influence of PV array. By using an azimuth of current solar position and the length between arrays, the controller of tracking device is able to calculate the length between actual arrays and make a comparison of the shadow length at a specific time with the length between arrays. When the shadow length is longer than the length between arrays, the controller of tracking device can adjust a position by compensating error altitude of the length between arrays at an altitude of current solar position. In the paper, we develop the control algorithm able to minimize the loss caused by the influence of shadow on the PV tracking system, and compared this with conventional output system. The controller has been tested in the laboratory with proposed algorithm and shows excellent performance.

Solar Cell Arrays Connection of Large Scale PV System (대규모 PV시스템의 태양전지 어레이 구성법)

  • Yu, Gwon-Jong;Song, Jin-Soo;Ro, Myong-Gun;Sung, Se-Jin
    • Proceedings of the KIEE Conference
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    • 1996.11a
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    • pp.326-328
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    • 1996
  • The 10kW or 1MW model of a photovoltaic array written in PSPICE is presented in this paper. A problem with this large scale centralized photovoltaic system is the decrease of power due to the resistance of cable connecting individual subarray with inverter. In this paper, we analyzed the relationship between the resistance of cable and subarray output power of 1MW photovoltaic system by the PSPICE modeling. As a result of simulation, we can proved that photovoltaic array output power is limitted by the resistance of cable.

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A Study on the Photovoltaic Array Optimal Arrangement Considering Power Output (출력을 고려한 태양전지 어레이 최적 배치에 관한 연구)

  • Choi, Hong-Kyoo;Choi, Dae-Won;Yoo, Hai-Chool;Choi, Shin-Gwon;Kim, Young-Kyu
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.23 no.12
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    • pp.96-105
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    • 2009
  • Photovoltaic array distance will be calculated that can have maximum output through the rearrangement of photovoltaic array by comparing and analyzing the power output decrease from the shadows of photovoltaic arrays according to the consideration of incidence angle that is not suitable to the situation of our country among the causes of power output decrease by sampling photovoltaic power generation plants. When relocate simulation result photovoltaic array 1 line, when relocate about 2.8[%], photovoltaic array 3 lines when relocate about 1.2[%], photovoltaic array 2 lines, output of about 5.0[%] improved. Also, gained space gains of photovoltaic array party 1.29[m] when relocate photovoltaic array party 0.82[m], 3 lines when relocate photovoltaic array party 0.39[m], 2 lines when relocate 1 line. As gains occur on photovoltaic array clearance, time that receive effect of shade was slowed down gradually and showed result that elevation of output shows finally.

A Study on Optimizing of Roof-Top Photovoltaic Arrays Arrangement Based on Three-Dimensional Geo-Spatial Information (3차원 지형공간정보 기반 지붕형 태양광 어레이 배치 최적화 연구)

  • Kim, Se-Jong;Koo, Kyo-Jin
    • Korean Journal of Construction Engineering and Management
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    • v.12 no.6
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    • pp.151-159
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    • 2011
  • Due to the Korean government's renewable energy support policy such as the renewable energy utilization building certificate and enlarging the compulsory ratio of investment on the public building, the rooftop photovoltaic projects are expanding rapidly. It is very important for the rooftop photovoltaic projects to analyze the shading effect of the adjacent structures or own facilities. But, the photovoltaic arrangements are planned by the experience of the designers or simple graphic tools. The purpose of this study is to build the process model for optimizing of rooftop photovoltaic arrangement based on three-dimensional geo-spatial information.

A Study on Fault Detection for Photovoltaic Power Modules using Statistical Comparison Scheme (통계학적 비교 기법을 이용한 태양광 모듈의 고장 유무 검출에 관한 연구)

  • Cho, Hyun Cheol;Jung, Young Jin;Lee, Gwan Ho
    • Journal of the Korean Solar Energy Society
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    • v.33 no.4
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    • pp.89-93
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    • 2013
  • In recent years, many investigations about photovoltaic power systems have been significantly carried out in the fields of renewable power energy. Such research area generally includes developments of highly efficient solar cells, advanced power conversion systems, and smart monitoring systems. A generic objective of fault detection and diagnosis techniques is to timely recognize unexpected faulty of dynamic systems so that economic demage occurred by such faulty is decreased by means of engineering techniques. This paper presents a novel fault detection approach for photovoltaic power arrays which are electrically connected in series and parallels. In the proposed fault detection scheme, we first measure all of photovoltaic modules located in each array by using electronic sense systems and then compare each measurement in turn to detect location of fault module through statistic computation algorithm. We accomplish real-time experiments to demonstrate our proposed fault detection methodology by using a test-bed system including two 20 watt photovoltaic modules.

Utility Interactive Photovoltaic Generation System Using Discontinuous Mode Buck-Boost Chopper (불연속모드 승강압초퍼를 이용한 계통연계형 태양광발전 시스템)

  • 김영철;이현우;서기영
    • The Transactions of the Korean Institute of Power Electronics
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    • v.4 no.4
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    • pp.325-331
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    • 1999
  • In a utility interactive photovoltaic generation system. a PWM inverter is used for the connection between the p photovoltaic arrays and the utility. The dc current becomes pulsated when the conventional inverter system operates i in the continuous current mode and de current pulsation causes the distortion of the accurrent waveform. This paper p presents the reduced pulsation of de input current by operating the inverter with buck-boost chopper in the d discontinuous conduction mode. The dc current which contains harmonic component is analyzed by means of s separating into two terms of a ripple component and a direct component. The constant dc current without p pulsation is supplied from photovoltaic array to the inverter. The proposed inverter system provides a sinusoidal ac c current for domestic loads and the utility line with unity power factor.

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A Variable Step Size Incremental Conductance MPPT of a Photovoltaic System Using DC-DC Converter with Direct Control Scheme

  • Cho, Jae-Hoon;Hong, Won-Pyo
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.27 no.9
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    • pp.74-82
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    • 2013
  • This paper presents a novel maximum power point tracking for a photovoltaic power (PV) system with a direct control plan. Maximum power point tracking (MPPT) must usually be integrated with photovoltaic (PV) power systems so that the photovoltaic arrays are able to deliver maximum available power. The maximum available power is tracked using specialized algorithms such as Perturb and Observe (P&O) and incremental Conductance (indCond) methods. The proposed method has the direct control of the MPPT algorithm to change the duty cycle of a dc-dc converter. The main difference of the proposed system to existing MPPT systems includes elimination of the proportional-integral control loop and investigation of the effect of simplifying the control circuit. The proposed method thus has not only faster dynamic performance but also high tracking accuracy. Without a conventional controller, this method can control the dc-dc converter. A simulation model and the direct control of MPPT algorithm for the PV power system are developed by Matlab/Simulink, SimPowerSystems and Matlab/Stateflow.

Utility interactive PV system using buck-boost chopper and partial resonant Inverter (승강압초퍼와 부부공진 인버터를 이용한 계통연계형 태양광 발전시스템)

  • 고강훈;이현우;김영철;정명웅;홍두성
    • Proceedings of the KIPE Conference
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    • 1999.07a
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    • pp.278-281
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    • 1999
  • In a utility interactive photovoltaic system, a PWM inverter is used for the connection between the photovoltaic arrays and the utility. The DC current becomes pulsated causes the distortion of the AC current waveform. This paper presents the reduced pulsation of DC input current by operating the inverter with buck-boost chopper in the discontinuous conduction mode. The DC current with contains harmonics component is analyzed by means of separating into two terms of a ripple component and a direct component. The constant DC current without pulsation is supplied from photovoltaic array to the inverter. The proposed inverter system provide a sinusoidal AC current for domestic loads and the utility line with unity power factor.

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Vector Control of Induction Motor Drive Using Photovoltaic Generation (태양광 발전을 이용한 유도전동기 드라이브의 벡터제어)

  • Jung, Byung-Jin;Ko, Jae-Sub;Choi, Jung-Sik;Kim, Do-Yeon;Jung, Dong-Hwa
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2008.10a
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    • pp.307-310
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    • 2008
  • This paper is proposed the vector control of 3-phase induction motor drive system by photovoltaic generation. For performance of vector control using a current control voltage source inverter(CC-VSI). CC-VSI is controlled by torque and flux producing component of motor current, relating with current and voltage value of photovoltaic arrays at maximum power point that varies follow different level of insolation. The MPPT using a DC-DC converter controlled the duty cycle to track maximum power from PV under different insolation conditions. The simulation results are shown that the characteristics and performance of drive system, which varies as each conditions of light by expresses in voltage($V_{dq}$), current($I_{dq}$), speed of motor and torque.

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Development of PSCAD User-defined Model for the Simulation of a PV Array (PV 어레이의 계통연계 모의를 위한 PSCAD 사용자 정의 모델 개발)

  • Ahn, Seon-Ju;Choi, Joon-Ho
    • Journal of the Korean Solar Energy Society
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    • v.31 no.5
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    • pp.134-139
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    • 2011
  • Since large and small scale photovoltaic(PV) systems have been commercialized in many countries, it is necessary to assess the effects of PV systems on the electric power system. For this, the development of accurate simulation model of PV arrays is very important. PSCAD/EMTDC, a widely used simulation tool for analyzing the transient behavior of electrical apparatus and networks, does not have a standard model of a PV array. Therefore in order to simulate the PV array, users have to develop their own simulation model. However, the block-diagram-based model is very complicated, and it is hard to modify the model parameters. In this study, we develop the user-defined model of a PV array by using the Design Editor, which is provided by PSCAD program. The mathematical model of a PV array and the method to determine the parameters of nonlinear I-V equation are implemented in a Fortran code. The graphical user interface provides the users with easy and simple way to modify the PV array parameters and simulation conditions. In order to help the users, this model also provides the parameters of 10 commercial PV arrays.