• Title/Summary/Keyword: Photovoltaic generator

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Maximum Power Point Tracking Control Employing Fibonacci Search Algorithm for Photovoltaic Power Generation System

  • Miyatake Masafumi;Kouno Tooru;Nakano Motomu
    • Proceedings of the KIPE Conference
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    • 2001.10a
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    • pp.622-625
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    • 2001
  • Photovoltaic generation systems need MPPT (Maximum Power Point Tracking) control because the output power depends on the operating voltage and current. Therefore, many researchers propose various types of MPPT control methods. A new MPPT control scheme is proposed in this paper in order to realize higher efficiency with simple calculation. The line search algorithm with fibonacci sequence which is one of the optimizing method is employed for the MPPT. The line search method is modified for real-time operation. The method is verified by simulations and experiments. It is concluded that the scheme can respond fast variation of irradiance.

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A novel design of DC-DC converter for photovoltaic PCS

  • Park, Sung-Joon
    • Journal of information and communication convergence engineering
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    • v.7 no.2
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    • pp.107-112
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    • 2009
  • Renewable energy resources will be an increasingly important part of power generation in the new millennium. Besides assisting in the reduction of the emission of greenhouse gases, they add the much needed flexibility to the energy resource mix by decreasing the dependence on fossil fuels. Due to their modular characteristics, ease of installation and because they can be located closer to the user, PV system have great potential as distributed power source to the utilities. In this paper, a dc-de power converter scheme with the push-pull based technology is proposed to apply for solar power system which has many features such as high efficiency, stable output, and low acoustic noises, DC-DC converter is used in proposed topology has stable efficiency curve at all load range and very high efficiency characteristics. This paper presents the design of a single-phase photovoltaic inverter model and the simulation of its performance.

A Study on The Energy Conservation System in House for reducing the Environmental Load (환경부하 저감을 위한 주택의 에너지절약 시스템에 관한 연구 -소형코제너레이션시스템과 태양광발전시스템을 적용한 성능평가-)

  • 정진현
    • Journal of the Korean housing association
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    • v.11 no.1
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    • pp.159-169
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    • 2000
  • This study was examined the energy conservation and the environmental value through the computer simulation employing the micro cogeneration system and the photovoltaic power generation system in house. The results of this study were as follows:1. In case of the micro cogeneration system. With the conditions of 'the electric produced by the micro cogeneration system was not sold to the electric power company', 'control quantity of commercial power supply was 10%' , 'operating time was 6 hour', 'minimum load rate of generator was 50%', and 'having a storage tank', the micro cogeneration system was superior compare to the comparative system in 2.4% of the energy conservation and 4.18% of the environmental value. 2. In case of the photovoltaic power generation system. 1) The 66.9% of total generated electric power from the photovoltaic power system was sold to the electric power company. That is, it could help to preserve the electric power from commercial power supply.2) There is a possibility of cutting the fair rate of electric power.

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Operation Algorithm of Hybrid Power System for Power Supply in a Remote Island (낙도 전력공급을 위한 복합발전시스템의 운전제어 알고리즘)

  • Kim, E.S.;Kim, S.K.;Lee, C.S.
    • Proceedings of the KIEE Conference
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    • 2001.10a
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    • pp.293-295
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    • 2001
  • In this paper, a control algorithm of a stand-alone type photovoltaic/wind/diesel hybrid power system for operation in a remote island, is proposed in detail. Power controllers are used to combine two different power outputs of photovoltaic and wind-power generations into DC output, which is converted into AC power to meet load while charging the storage battery for later use. In the event that the whole power load cannot be met by photovoltaic and wind power only, power stored in the battery cell is supplied and if even this power run out, diesel generator will be applied. Certain portion of diesel power is used to cover the load and the other to charge the battery.

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Reduction of Heat Generation from Junction Box in 3 kW Photovoltaic Power Generation System

  • Yun, Jung-Hyun;Sun, Ki-Ju;Cheon, Min-Woo
    • Transactions on Electrical and Electronic Materials
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    • v.17 no.1
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    • pp.21-24
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    • 2016
  • A junction box used in a 3 kW photovoltaic power generation system plays a role in collecting and supplying the direct current voltage produced by photovoltaic modules to an inverter. It is also used for facilitating maintenance checks and protecting the module and inverter by keeping the voltage constant. As for the junction box, using it in a parallel connection creates a difference between the setup modules. In order to compensate, an inverse voltage diode is used. But the high-power created through the solar generator can be delivered to the inverter through the inverter regularly. Therefore, a component can break down due to excess heat. And consequently short circuits and electric leakage occurs. In this study, using a junction box that enabled the bypass of high electric power, it was possible to reduce heat generation by approximately 35℃ when compared to a standard junction box.

A Study on Adaptive Converter Control Approach for Velocity Control of Electric Motors with Photovoltaic Power Generators (태양광 발전 기반 전동기 속도 제어를 위한 적응형 컨버터 제어 기법에 관한 연구)

  • Park, Sung Won;Kim, Dong Wan;Cho, Hyun Cheol
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.8
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    • pp.1400-1406
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    • 2016
  • This paper presents a new adaptive converter control approach for electric motor systems whose voltage source is excited from photovoltaic (PV) power generators. First, an electric model is represented with dynamic states and output velocity of such DC motor systems. We propose a hybrid converter control law in which a state feedback control is applied as an auxiliary control framework. Moreover, control parameter estimation is derived to realize adaptive converter systems for effective control performance against stochastic PV power excitation in practice. We carry out stability analysis for such converter system by using a well-known eigenvalue theory. Lastly, numerical simulation is conducted to test reliability of the proposed converter control approach and prove its superiority in the control point of view.

A Study on Optimal Operation Method of Multiple Microgrid System Considering Line Flow Limits (선로제약을 고려한 복수개의 마이크로그리드 최적운영 기법에 관한 연구)

  • Park, Si-Na;An, Jeong-Yeol
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.19 no.7
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    • pp.258-264
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    • 2018
  • This paper presents application of a differential search (DS) meta-heuristic optimization algorithm for optimal operation of a micro grid system. The DS algorithm simulates the Brownian-like random-walk movement used by an organism to migrate. The micro grid system consists of a wind turbine, a diesel generator, a fuel cell, and a photovoltaic system. The wind turbine generator is modeled by considering the characteristics of variable output. Optimization is aimed at minimizing the cost function of the system, including fuel costs and maximizing fuel efficiency to generate electric power. The simulation was applied to a micro grid system only. This study applies the DS algorithm with excellence and efficiency in terms of coding simplicity, fast convergence speed, and accuracy in the optimal operation of micro grids based on renewable energy resources, and we compared its optimum value to other algorithms to prove its superiority.

Appliction of Separate-Excitation Inverter for Photovoltaic Power Generation System (타여식 인버터의 태양광발전시스템의 응용)

  • Yu, Gwon-Jong;Jeon, Hong-Seok
    • Solar Energy
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    • v.13 no.2_3
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    • pp.140-150
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    • 1993
  • This paper describes technical details of Separate Excitation Inverter(SEI) application for the photovoltaic system. Depending on the output characteristics of solar cell modules, optimum control for the maximum electricity generation of photovoltaic system could be determined. New control mechanism of Separate Excitation Inverter for the Photovoltaic-Diesel Hybrid Generator was tested and examined. Results of this paper describe that maximum out of solar cell array could be obtained at two points. Therefore the two point control method was applied and verified between, the theory and the experiment.

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Implementation of a Photovoltaic System Simulator for Interconnecting with Bipolar ±750V DC distribution Grid (바이폴 ±750 직류 배전망 연계용 태양광 발전 시뮬레이터 구현)

  • Kim, Tae-Hoon;Kim, Seok-Woong;Cho, Jin-Tae;Kim, Ju-Yong;Jung, Jae-Seung
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.11
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    • pp.1800-1805
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    • 2016
  • The micro-grid designed as bipolar ${\pm}750V$ low-voltage DC power distribution system demonstrated by KEPRI, demands interconnection of a number of small decentralized power source including variable renewable generator. Therefore, variable researches for the influence of interconnection with the bipolar typed DC grid and these variable power sources are required for superior quality of power distribution. Renewable power generation simulators for the bipolar ${\pm}750V$ low-voltage DC power distribution system are necessary for such researches. In this paper, we carry out a research on the photovoltaic simulator that be actually able to interconnect with a bipolar ${\pm}750V$ low-voltage micro-grid. Simulator for this research is not only able to simulate photovoltaic generation according to weather informations and PV modules characteristics, but also contribute to stabilization of bipolar ${\pm}750V$ low-voltage of the system. Therefore, the simulator was designed to develop a system that can situationally respond to variable control algorithms such as the MPPT control, droop control, EMS power control, etc.

Economic Evaluation of ESS and Natural Gas Generator for Expansion of New and Renewable Generation (신재생발전 확대적용을 위한 ESS와 천연가스발전기의 경제성 평가)

  • JOO, YONGJIN;SHIN, JUGON;SEO, DONGKYUN;PARK, SEIK
    • Transactions of the Korean hydrogen and new energy society
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    • v.29 no.4
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    • pp.363-369
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    • 2018
  • This paper considers the alternative way to mitigate cost for REC instead of Photovoltaic (PV) panels with Energy Storage System (ESS). This study starts from an economic analysis of a 1 megawatt PV system without ESS. Several assumptions have been applied in consideration of the current domestic situation. Based on this result, the economic efficiency of PV with ESS improved. However, the reliance on government subsidies was very high. The alternative way to cover the fluctuation power from renewable energy was reviewed with economical and technical way. In case the natural gas engine applied to PV, the IRR and Levelized Cost of Electricity (LCOE) can be improved without ESS. And if small amount of additional REC, the IRR can be improved up to investment level.