• 제목/요약/키워드: PV Source

검색결과 211건 처리시간 0.036초

태양광 전원과 리튬 에너지 저장장치의 연계운전시 특성 해석 (Analysis of Connected Operations of PV Source and Li Energy Storage Equipment to Power System)

  • 김덕영
    • 조명전기설비학회논문지
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    • 제28권8호
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    • pp.106-112
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    • 2014
  • This paper presents the analysis of connected operation of photo voltaic source and Li energy storage system. The micro-grid has been installed and operated for several years at the campus of USF and has been a role of test bed. Photo voltaic source has been strongly influenced by the location, weather and climate of a installed area and Li battery is connected directly to the photo voltaic source to compensate for the limitations. The Li battery is operated to supply power output to the grid by the charging or discharging mode based on the average power output of the PV source which is calculated from monitored data for several years. The load of the PV and Li battery system is operated as a severe loading condition and the operating characteristics of PV source and Li battery are analyzed in detail. In connected operations of PV and Li battery to power system, the PV and Li battery is operated to supply constant power during only day time or peak time to increase load shedding ratio and efficient usage of generation sources in power system.

A Modified Single-Phase Transformerless Z-Source Photovoltaic Grid-Connected Inverter

  • Liu, Hongpeng;Liu, Guihua;Ran, Yan;Wang, Gaolin;Wang, Wei;Xu, Dianguo
    • Journal of Power Electronics
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    • 제15권5호
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    • pp.1217-1226
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    • 2015
  • In a grid-connected photovoltaic (PV) system, the traditional Z-source inverter uses a low frequency transformer to ensure galvanic isolation between the grid and the PV system. In order to combine the advantages of both Z-source inverters and transformerless PV inverters, this paper presents a modified single-phase transformerless Z-source PV grid-connected inverter and a corresponding PWM strategy to eliminate the ground leakage current. By utilizing two reversed-biased diodes, the path for the leakage current is blocked during the shoot-through state. Meanwhile, by turning off an additional switch, the PV array is decoupled from the grid during the freewheeling state. In this paper, the operation principle, PWM strategy and common-mode (CM) characteristic of the modified transformerless Z-source inverter are illustrated. Furthermore, the influence of the junction capacitances of the power switches is analyzed in detail. The total losses of the main electrical components are evaluated and compared. Finally, a theoretical analysis is presented and corroborated by experimental results from a 1-kW laboratory prototype.

엑티브필터 기능을 추가한 새로운 태양광 발전시스템의 제안 (Novel Concept of Shunt Active Filter Function Added in PV Generation System)

  • 김봉태;박민원;성기철;유인근
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2001년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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    • pp.296-300
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    • 2001
  • Novel concept of shunt active filter (AF) function added in Photovoltaic (PV) generation system is described in this paper. So far, for the PV generation system has been treated as one of harmonic sources to the power distribution systems, not only a PV system combined with AF but also AF systems using PV module as their power source have never been discussed. The basic structure and control strategy of the PV-AF system are, for the first time, introduced in this work. In order to stabilize the output current of voltage source inverter (VSI), the reference voltage MPPT control is applied. Simulation analysis shows that it is possible to combine AF function to the three-phase grid-connected PV generation system without any physical difficulties, and the performance of the proposed PV-AF system is acceptable and stable as well.

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태양전지 전류에 의한 계통연계형 태양광발전시스템의 최대출력 제어법 (Maximum Power Point Tracking Control of Photovoltaic System by using Current Solar Cell)

  • 박인덕;성낙규;김대균;이승환;오봉환;김성남;한경희
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 1998년도 전력전자학술대회 논문집
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    • pp.109-112
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    • 1998
  • A step down chopper and PWM current source inverter is used for the connection between the PV array and the utility. This paper proposes chopper is controlled for the dc reactor decrease and PWM current source inverter is controlled to keep the output power at the maximum point for the PV. The PV current only is measured and employed for the power calculation combining the control parameter of the PWM current source inverter.

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A BIFUNCTIONAL UTILITY CONNECTED PHOTOVOLTAIC SYSTEM WITH POWER FACTOR CORRECTION AND U.P.S. FACILITY

  • Kim. S.;Yoo, Gwonjong;Song, Jinsoo
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 1996년도 창립기념 전력전자학술발표회 논문집
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    • pp.103-108
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    • 1996
  • In this paper, a novel utility connected photovoltaic power generation system with unity power factor and uninterruptable power system facility and its control strategy are proposed. The proposed photovoltaic(PV) system is connected in parallel between utility and load. The PV system provides an uninterruptable voltage to load, a maximum power tracking to solar array, and power factor correction to the utility. The proposed system has the following advantages compared with the conventional utility connected PV system. 1. Harmonic elimination Function 2. Feeding the photovoltaic energy to the utility 3. Providing the uninterruptible power source along battery to the load In case that the photovoltaic array system is on the poor power generation, the battery and capacitor of the PV system are charged by three phase utility source and the inverter in the PV system only provides the reactive current to eliminate the harmonic current exited on the utility. In the normal operation mode, the PV system supplies active power to load and reactive power to utility in order to maintain the unity power factor and to regulate ac load voltage.

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액티브필터 기능을 가진 태양광발전시스템(PV-AF 시스템)의 MPPT제어법에 따른 출력특성비교 (Comparison of the operational characteristics of the PV-AF system according to the various MPPT controls)

  • 박민원;김봉태;이재득;성기철;유인근
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2001년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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    • pp.325-327
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    • 2001
  • So far, because the photovoltaics power generation system can be treated to a harmonics source for the power distribution systems, the PV system combined the function of AF systems as well as the AF systems using the PV module as the power source have never been reported. However, authors have recently proposed a novel concept of the photovoltaics power generation system adding the function of the active filter (PV-AF system). In this paper, in order to confirm the operational characteristics of the PV-AF system, various MPPT controls are applied and analyzed.

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해저 케이블 분산 네트워크를 위한 UPQC 기반의 전압 보상 PV Source 인버터 (PV Source Inverter with Voltage Compensation based on UPQC for Submarine Cable Distribution Network)

  • 데스몬 페트러스 시마투팡;김원영;최재호
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2018년도 전력전자학술대회
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    • pp.380-381
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    • 2018
  • Under-voltage and over-voltage are the big problems in submarine distribution system. To solve that problems, integrated PV with voltage compensation method is proposed in this paper. This paper describes a simple method for controlling the series connection converter while the shunt connection operates as a back-up for sensitive load and verified by the PSIM software.

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An Efficient and High-gain Inverter Based on The 3S Inverter Employs Model Predictive Control for PV Applications

  • Abdel-Rahim, Omar;Funato, Hirohito;Junnosuke, Haruna
    • Journal of Electrical Engineering and Technology
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    • 제12권4호
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    • pp.1484-1494
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    • 2017
  • We present a two-stage inverter with high step-up conversion ratio engaging modified finite-set Model Predictive Control (MPC) for utility-integrated photovoltaic (PV) applications. The anticipated arrangement is fit for low power PV uses, the calculated efficiency at 150 W input power and 19 times boosting ratio was around 94%. The suggested high-gain dc-dc converter based on Cockcroft-Walton multiplier constitutes the first-stage of the offered structure, due to its high step-up ability. It can boost the input voltage up to 20 times. The 3S current-source inverter constitutes the second-stage. The 3S current-source inverter hires three semiconductor switches, in which one is functioning at high-frequency and the others are operating at fundamental-frequency. The high-switching pulses are varied in the procedure of unidirectional sine-wave to engender a current coordinated with the utility-voltage. The unidirectional current is shaped into alternating current by the synchronized push-pull configuration. The MPC process are intended to control the scheme and achieve the subsequent tasks, take out the Maximum Power (MP) from the PV, step-up the PV voltage, and introduces low current with low Total Harmonic Distortion (THD) and with unity power factor with the grid voltage.

Difference of Physiochemical Characteristics Between Citrus Bacterial Canker Pathotypes and Identification of Korean Isolates with Repetitive Sequence PCRs

  • Lee, Yong-Hoon;Lee, Seung-Don;Lee, Dong-Hee;Yu, Sang-Mi;Lee, Jung-Hee;Heu, Sung-Gi;Hyun, Jae-Wook;Ra, Dong-Soo;Park, Eun-Woo
    • The Plant Pathology Journal
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    • 제24권4호
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    • pp.423-432
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    • 2008
  • The difference of carbon source utilization and fatty acid composition between the pathotypes of Xanthomonas strains, which causing citrus bacterial canker was compared, and the physiochemical characteristics were used to analyze relationship of the strains for the first time. The pattern of several carbon sources utilization and fatty acids composition reliably discriminated the pathotypes of Xanthomonas strains. The dendrogram which was constructed by 95 carbon source utilization profiles differentiated X. axonopodis pv. citri A, $A^*$ and $A^w$ from the other pathotypes. When the dendrogram was drawn by combined analysis of carbon source utilization pattern and fatty acid composition, X. axonopodis pv. aurantifolii B, C and X. axonopodis pv. citrumelo formed a distinct cluster. The difference of carbon source utilization and fatty acid composition could be used effectively for the identification of pathotypes of citrus bacterial canker. The physiochemical characteristics strongly indicated that the strains isolated in Korea belong to X. axonopodis pv. citri A type. The cluster analysis by the band patterns of ERIC-, BOX- and REP-PCR allowed the discrimination of the pathotypes isolated from Korea. However, the rep-PCRs could not differentiate X. axonopodis pv. citri A types from $A^*$ and $A^w$ types. The overall results of metabolic profiles and rep-PCRs strongly indicated that the Korean isolates are X. axonopodis pv. citri A type.

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

  • 성낙권;박민원;유인근
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2002년도 하계학술대회 논문집 B
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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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