• Title/Summary/Keyword: Grid-connected PV System

Search Result 61, Processing Time 0.246 seconds

Assessment on Power Quality of Grid-Connected PV System Based on Incremental Conductance MPPT Control (증분컨덕턴스 MPPT제어 기반 계통연계형 태양광발전시스템의 전력품질 평가)

  • Seol, Jae-Woong;Jang, Jae-Jung;Kim, Dong-Min;Lee, Seung-Hyuk;Kim, Jin-O
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.56 no.1
    • /
    • pp.8-13
    • /
    • 2007
  • During the last years, there has been an increased interest in the new energy such as photovoltaic(PV) system from the viewpoint of environmental pollution. In this regard, this paper estimates the power quality of grid-connected PV system. As the maximum power operating point(MPOP) of photovoltaic(PV) power systems alters with changing atmospheric conditions, the efficiency of maximum power point tracking(MPPT) is important in PV power systems. Moreover, grid-connected PV system occurs some problems such as voltage inequality and harmonics. Therefore, this paper presents the results of a grid-connected PV system modeling that contains incremental conductance MPPT 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(TDD) and total demand distortion(TDD). For the case study, the measured data of the PV way in Cheongwadae, Seoul, Korea is used.

Novel Islanding Detection Method using Frequency Drift for Grid-connected PV System (계통연계형 태양광발전 시스템의 주파수 변동에 의한 새로운 고립운전 검출기법)

  • Eun Suk-Jun;;;Lee Dong-Chun
    • The Transactions of the Korean Institute of Electrical Engineers B
    • /
    • v.54 no.6
    • /
    • pp.294-302
    • /
    • 2005
  • PV system's islanding occurs when the uitilty grid is removed but local sources continue to operate and provide power to local loads. Islanding is one of the serious problems in an electric power system connected with dispersed power sources. Also, this can present safety hazards and the possibility of damage to other electric equipments. If the real and reactive power of RLC load and PV system are closely matched, islanding detection by passive methods becomes difficult. This paper shows the simulation and comparision for the previous active methods and novel islanding detection method using frequency drift is proposed for grid-connected PV system.

Solar Comparative Analysis of Various MPPT Algorithms (태양광 최대전력추종 제어알고리즘 성능 비교 분석)

  • Shim, Jae-Hwe;Kang, San;Kim, Shin-Ah;Hong, Ki-Nam;Choi, Ju-Yeop
    • Proceedings of the KIPE Conference
    • /
    • /
    • pp.77-78
    • /
    • 2010
  • As the maximum power operating point(MPOP) of photovoltaic(PV) power systems alters with changing atmospheric conditions, the efficiency of maximum power point tracking(MPPT) is important in PV power systems. Moreover, grid-connected PV system occurs some problems such as voltage inequality and harmonics. Therefore, this paper presents the results of a grid-connected PV system modeling by PSIM simulator and investigates the influence on the grid-connected PV system from aspect of power quality, i.e. voltage drop. This paper includes four MPPT algorithms; Perturbation & Observation(P&O), Improved P&O, Increment Conductance(Incond), Hysterisis simulated with irradiation changing.

  • PDF

Study for Influence of grid-connected PV System on The Distribution System. (계통연계형 태양광발전시스템의 배전계통에 미치는 영향)

  • 정영석;강기환;유권종;송진수
    • Proceedings of the KIPE Conference
    • /
    • /
    • pp.100-102
    • /
    • 1998
  • In recent years, for the viewpoint of environment and electric power demand for stable secure, new energy such as photovoltaic system (PV) become increasingly popular. In case of interconnecting PV to the commercial electric company, two problems will occur when operating in isclation with the other general consumers. One is doing harm to the power quality. And the other is the security problem caused by charching a part of commercial system line that has to be no voltage. In this paper, a simple modelling of distribution system and grid-connected PV system and simulation result were proposed.

  • PDF

DC link Ripple Voltage Compensation of a Single-phase Grid-Connected PV System (단상 계통연계형 태양광 발전 시스템의 직류링크 맥동전압 보상)

  • Lee, Jae-Geun;Choi, Jong-Woo
    • The Transactions of the Korean Institute of Power Electronics
    • /
    • v.17 no.5
    • /
    • pp.377-387
    • /
    • 2012
  • A single-phase grid-connected PV system is known as suitable for housing of less than 3 kW. The DC link voltage in a single-phase PV system has necessarily twice component of fundamental wave. It makes high THD in the grid current. According to the problem, power quality is lower. Many engineers have studied about this problem. The most simple method is to use low pass filter on DC link voltage control. However it is affected by DC link voltage control bandwidth. If cutoff frequency is reduced to increase the performance of low pass filter, it also lowers DC link voltage control bandwidth. Second method is using band stop filter, it works good on steady state but not good on transient state. This paper proposes the new method for removing ripple voltage to get an exact current reference. It improves the responses on steady state and transient state. The performance was verified through computer simulation using MATLAB and actual experiments.

The study on construction of the practical testing ground of grid-connected photovoltaic system (태양광발전 계통연계 실증시험장 구축에 관한 연구)

  • Kim, Euihwan;Jang, Juyeon
    • 한국신재생에너지학회:학술대회논문집
    • /
    • /
    • pp.65.2-65.2
    • /
    • 2010
  • Currently the variety of governmental business support and research for supplying solar energy have been actively progressed. As of now, however, There are no practical testing infrastructures of grid-connected photovoltaic system which test performance of solar power facility in domestic. Therefore, in KEPRI, there is in progress construction of practical testing ground of 500 kW class grid-connected PV System for developing the evaluation of the performance technology including the Module, PCS, and etc, that is the important instrument of the PV System, in Gochang area. It analyzed the site creation work for constructing the practical testing ground and new construction of control room and the unit standards, specifications and capacity of required equipment. For the system detailed design, configuration, instrument-specific parameters established, power generation predictions of Array Type and the components of testing ground are needed to build.

  • PDF

Grid Connected PV System of High-Frequency Link Using Soft-Switching (소프트-스위칭을 적용한 고주파 링크 방식의 계통연계형 태양광 발전 시스템)

  • Lee S.R;Joo Y.H.;Jeon C.H;Lim S.H.;Han B.S.
    • Proceedings of the KIPE Conference
    • /
    • /
    • pp.59-62
    • /
    • 2001
  • New grid connected PV system of high-frequency link with soft-switching is proposed to solve problems related with transformer and switching loss. The operation of suggested equipment using the soft switching that consists of high frequency transformer is confirmed by computer simulation and experiment that it can improve its efficiency and solve the problems mentioned above.

  • PDF

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
    • /
    • /
    • pp.1227-1228
    • /
    • 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.

  • PDF

Novel Islanding Detection Method using Frequency Drift for Grid-connected PV System (계통연계형 PV 시스템의 주파수 변동에 의한 새로운 단독운전 검출기법)

  • Eun Seog-Jun;Choi Jong-Woo;Kim Heung-Geun
    • Proceedings of the KIPE Conference
    • /
    • /
    • pp.133-137
    • /
    • 2004
  • PV system's islanding occurs when the uitilty grid is removed but local sources continue to operate and provide power to local loads. Islanding is one of the serious problems m an electric power system connected with dispersed power sources. Also, this can present safety hazards and the possibility of damage to other electric equipments. If the real and reactive power of RLC load and PV system are closely matched, islanding detection by passive methods becomes difficult. Novel islanding detection method using frequency drift is proposed for grid-connected PV system.

  • PDF

Grid Connected PV System with a Function to Suppress Disturbances caused by Solar-cell Array Instantaneous Output Power Fluctuation (태양전지어레이 순시 출력변동에 의한 외란의 억제기능을 갖는 계통연계형 태양광발전 시스템)

  • Kim, Hong-Sung;Choe, Gyu-Ha;Yu, Gwon-Jong
    • Solar Energy
    • /
    • v.19 no.4
    • /
    • pp.63-69
    • /
    • 1999
  • The conventional grid connected PV(Photovoltaic) system has a unstable output pattern due to its dependence on the weather condition, although solar-cell array averagely has a regular output characteristics to have a peak output nearly at noon. Therefore assuming the high density grid connection in the future, this unstable output pattern can be one of the main reasons to generate power disturbance such as voltage variation, frequency variation and harmonic voltage generation in low voltage distribution line. However general grid connected solar-cell system do not have functions to cope with these disturbances. Therefore this study proposed a advanced type grid connected PV system with functions to suppress output power fluctuation due to solar-cell array output variation and showed the levelling effect of fluctuation due to instantaneous array output variation.

  • PDF