• Title/Summary/Keyword: Grid connected

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Control of Single-Phase Grid-Connected Photovoltaic System using a Z-Source Inverter (Z-소스 인버터를 사용한 단상 계통 연계형 태양광 시스템 제어)

  • Chun, Tae-Won;Tran, Quang-Vinh;Kim, Heung-Geun
    • The Transactions of the Korean Institute of Power Electronics
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    • v.13 no.5
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    • pp.369-375
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    • 2008
  • In this paper, a method for controlling the a single-phase grid-connected photovoltaic(PV) system using Z-source inverter (ZSI) is proposed. The operating region of grid-connected ZSI system with a variation of PV output voltage are analyzed by considering the voltage stress across switching devices. The switching patterns for controlling effectively the shoot-through time while reducing the switching loss are suggested. Both the simulation studies and experimental results with 32-bit DSP are carried out to verify the performances of proposed system.

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
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    • pp.65.2-65.2
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    • 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.

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Analysis and Design of LCL Filter with Passive Damping Circuits for Three-phase Grid-connected Inverters

  • Ahn, Hyo Min;Oh, Chang-Yeol;Sung, Won-Yong;Ahn, Jung-Hoon;Lee, Byoung Kuk
    • Journal of Electrical Engineering and Technology
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    • v.12 no.1
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    • pp.217-224
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    • 2017
  • The analysis and design process of the LCL filter with passive damping circuits for three-phase grid-connected inverter are presented based on the generalized model of LCL filter. Several types of the passive damping circuits in previous studies could be compared and analyzed by using the generalized model considering various design criteria of passive damping circuits. According to the analysis in this paper, a reasonable configuration of passive damping circuits for three-phase grid-connected inverters is proposed. The validity of the proposed design process is verified by informative simulation and experimental results.

Economic analysis on Sustainable Photovoltaic Systems (지속가능한 태양광발전시스템의 경제성 분석)

  • Park, Soo-Uk;Lee, Deok-Ki
    • New & Renewable Energy
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    • v.1 no.3
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    • pp.35-41
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    • 2005
  • This paper analyses the economics of grid-connected photovoltaic systems. With the 2003 cost of photovoltaic systems, under prevailing capital market conditions, with a system lifetime of 30 years, and under the best climatic conditions, it appears that the cost of production of grid-connected electricity could be of 0.21 US $/kWh, and under medium climatic conditions, European locations, Switzerland, Japan and South Korean could be of 0.28$/kWh. If the lifetime if the system goes up, due to future technological improvements, to a very large value such as 50 years, these costs can be lowered by 10-20%. Competitiveness of grid-connected photovoltaic electricity, while it still cannot be taken for granted, is a possibility, especially if major technological advances further lowers the costs of photo cells and increases their lifetimes.

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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
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    • v.19 no.4
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    • pp.63-69
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    • 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.

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Losses Comparison and Analysis for Fault Modes of Grid-connected Photovoltaic System (계통연계형 태양광발전 시스템의 고장유형별 손실 비교분석)

  • So, Jung-Hun;Ko, Suk-Whan;Ju, Young-Chul
    • Journal of the Korean Solar Energy Society
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    • v.37 no.3
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    • pp.23-32
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    • 2017
  • This paper presents losses comparison and analysis results for different types of fault modes of grid-connected photovoltaic system generated for long-term operation. The approach of losses comparison and analysis by faults is to identify relationship between measured and estimated values of five loss factors which are quantified from irradiance to system output power. This paper presents the symptom results for faults such as snow, shading, sensor defect, blackout, soiling and so on from three years or more monitored data. These results will indicate that it is useful to develop fault detection and diagnosis tool to enhance capacity factor and save operation and maintenance cost of grid-connected photovoltaic system in the field.

A Power Quality Monitoring of The Grid-connected Wind Turbine in Daegwallyeong Test Site (계통 연계 대관령 풍력실증단지에서의 전력 품질 모니터링)

  • Kwon H. J.;Kim K. H.;Jang S. I.;Yoo N. S.
    • Proceedings of the KIEE Conference
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    • pp.1513-1515
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    • 2004
  • This paper describe the power quality monitoring results of the grid-connected wind turbine generator in Daegwallyeong Test Site. The power quality monitoring for grid-connected wind turbine generators are important to verify their performance as the grid-connected generators. In order to measure the impacts on the grid of wind turbine generator and evaluate the performance by analyzing electrical parameters, we equipped the power quality monitoring system in the real field of the Daegwallyeong test site. The developed monitoring system gathers information by remote access through the internet. The monitoring results and the detail explanation for the developed wind turbine monitoring system is presented in the study.

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Adaptive Neural PLL for Grid-connected DFIG Synchronization

  • Bechouche, Ali;Abdeslam, Djaffar Ould;Otmane-Cherif, Tahar;Seddiki, Hamid
    • Journal of Power Electronics
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    • v.14 no.3
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    • pp.608-620
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    • 2014
  • In this paper, an adaptive neural phase-locked loop (AN-PLL) based on adaptive linear neuron is proposed for grid-connected doubly fed induction generator (DFIG) synchronization. The proposed AN-PLL architecture comprises three stages, namely, the frequency of polluted and distorted grid voltages is tracked online; the grid voltages are filtered, and the voltage vector amplitude is detected; the phase angle is estimated. First, the AN-PLL architecture is implemented and applied to a real three-phase power supply. Thereafter, the performances and robustness of the new AN-PLL under voltage sag and two-phase faults are compared with those of conventional PLL. Finally, an application of the suggested AN-PLL in the grid-connected DFIG-decoupled control strategy is conducted. Experimental results prove the good performances of the new AN-PLL in grid-connected DFIG synchronization.

Loss Analysis and Comparison of Grid-connected Bidirectional Inverter with Different Types of PWM Schemes (PWM 방식에 따른 계통연계 양방향 인버터의 손실양상 비교 및 분석)

  • Heo, Sung-Jun;Ahn, Hyo-Min;Byun, Jong-Eun;Lee, Byoung-Kuk
    • The Transactions of the Korean Institute of Power Electronics
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    • v.22 no.6
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    • pp.547-550
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    • 2017
  • This paper presents a loss analysis and compares three pulse width modulation (PWM) methods applied in a three-phase grid-connected bidirectional inverter for an energy storage system. The losses in switching devices and output low pass filters are theoretically analyzed by using PWM control techniques. Grid-connected bidirectional inverters are designed by using PWM techniques, and the designed inverters are simulated to verify the analysis results.

Study and Design of L-C-L Filter for Single-Phase Grid-Connected PV Inverter (단상 계통연계 태양광 인버터용 L-C-L 필터 설계 및 분석)

  • Cha, Han-Ju;Vu, Trung-Kien
    • Proceedings of the KIEE Conference
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    • pp.228-230
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    • 2009
  • Nowadays, the LCL-filter type becomes an attractive grid interfacing for grid-connected Voltage Source Inverter (VSI). LCL-filter can render the current harmonics attenuation around the switching frequency by using smaller inductance than L-filter. This paper presents a study about the LCL-filter design for single-phase grid-connected inverter in Photovoltaic (PV) system. According to the expected current ripple, the inductances of the filter can be determined. Based on the absorbed reactive power on capacitor, the capacitance can be calculated. Due to the theoretical analysis, a LCL-filter based single phase grid connected inverter control system are simulated. The studied simulation results are given to validate the theoretical analysis.

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