• Title/Summary/Keyword: maximum power transfer

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PWM Switch Modelling of Boost Converter for Photovoltaic System (PWM 스윗치를 이용한 햇빛발전 시스템용 부스트 컨버터 모델링)

  • Kim, H.J.;Choi, J.Y.;Yu, G.J.;Jung, Y.S.;Choi, I.;Ahan, H.S.
    • Proceedings of the KIEE Conference
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    • 2003.04a
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    • pp.341-348
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    • 2003
  • Photovoltaic systems normally use a maximum power point tracking (MPPT) technique ta continuously deliver the highest possible power to the load when variations in the insolation and temperature occur. A simple method of tracking the maximum power points (MPPs) and forcing the boost converter system to operate close to these points is presented through deriving small-signal model and transfer function of boost converter. This paper aims at modeling boost converter including equivalent series resistance of input reservoir capacitor by state-space-averaging method and PWM switch model with properly designed controller for maximum photovoltaic power tracking control.

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Boost Converter Modeling of Photovoltaic System Using PWM Switch Model (PWM 스윗치 모델을 이용한 PV용 Boost Converter Modelling)

  • Kim, H.J.;Lee, K.O.;Choi, J.Y.;Jung, Y.S.;Yu, G.J.;Kwon, J.D.
    • Proceedings of the KIEE Conference
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    • 2002.11d
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    • pp.286-293
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    • 2002
  • Photovoltaic systems normally use a maximum power point tracking (MPPT) technique to continuously deliver the highest possible power to the load when variations in the insolation and temperature occur. A simple method of tracking the maximum power points (MPPs) and forcing the boost converter system to operate close to these Points is presented through deriving small-signal model and transfer function of boost converter. This paper aims at modeling boost converter including equivalent series resistance of input reservoir capacitor by state-space-averaging method and PWM switch model. In the future, properly designed controller for compensation will be constructed in real system for maximum photovoltaic power tracking control.

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Performance Analysis of Adaptive Bandwidth PLL According to Board Design (보드 설계에 따른 Adaptive Bandwidth PLL의 성능 분석)

  • Son, Young-Sang;Wee, Jae-Kyung
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.45 no.4
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    • pp.146-153
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    • 2008
  • In this paper, a integrated phase-locked loop(PLL) as a clock multiphase generator for a high speed serial link is designed. The designed PLL keeps the same bandwidth and damping factor by using programmable current mirror in the whole operation frequency range. Also, the close-loop transfer function and VCO's phase-noise transfer function of the designed PLL are obtained with circuit netlists. The self impedance on board-mounted chip is calculated according to sizes and positions of decoupling capacitors. Especially, the detailed self-impedance analysis is carried out between frequency ranges represented the maximum gain in the close-loop transfer function and the maximum gain in the VCO's phase noise transfer function. We shows PLL's jitter characteristics by decoupling capacitor's sizes and positions from this result. The designed PLL has the wide operating range of 0.4GHz to 2GHz in operating voltage of 1.8V and it is designed 0.18-um CMOS process. The reference clock is 100MHz and PLL power consumption is 17.28mW in 1.2GHz.

Design of Micro Energy Harvesting System using Thermoplastic Polyurethane and Buck-boost Converter (열가소성 폴리우레탄과 벅-부스트 컨버터를 이용한 마이크로 에너지 포집시스템 설계)

  • Son, Young-Dae;Kim, Gue-Hyun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.3
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    • pp.560-565
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    • 2011
  • This paper proposes the design of micro energy harvesting system by using thermoplastic polyurethane(TPU), which harvests electric energy from the kinetic energy of pedestrian and drives the desired load, and applied it to the self-generating shoes. Also, we designed the buck-boost converter in discontinuous conduction mode(DCM) which functions as a resistor emulator(RE) such that converter's average input current is proportional to input voltage, and it results in transfer of maximum power to buck-boost converter according to control behavior that converter's input resistance is matched with TPU's internal resistance. Therefore, this paper confirms the validity of proposed control scheme and possibility of application for self-generating shoes, from the obtained characteristic of designed micro energy harvesting system by using a TPU and buck-boost converter in DCM.

Maximum Transfer Capability Calculating in Interconnected Power System using Monte-Carlo Sinulation (Monte-Carlo Simulation을 이용한 연계계통의 최대수송전력 산정)

  • Nam, Kwang-Woo;Kim, Yong-Ha;Lee, Buhm;Choi, Sang-Gyu
    • Proceedings of the KIEE Conference
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    • 2000.07a
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    • pp.360-362
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    • 2000
  • This paper presents a probabilistic method for describing the transfer capability of one area in an interconnected power system. The approach is based on Monte Carlo simulation scheme. The result of this method is the probability distribution of transfer capability. The distribution yield a general framework for probabilistic analysis of STC. IEEE RTS-24 power system is utilized to evaluate the proposed method.

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A Study on Heat Transfer of an Underground Power Transmission Cable-Joint (지중송전케이블 접속부에서의 열전달에 관한 연구)

  • Park, M.H.;Kim, J.K.;Lee, J.H.
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.5 no.4
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    • pp.265-277
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    • 1993
  • Recently, underground transmission system is growing continuously according to the electric power demand increase in the downtown area. Even if domestic cable makers are manufacturing 154kV oil filled cable and joint, the design technology of cable-joint has not been fully self-reliance. This study is aimed at the detail heat transfer analysis of 154kV cable-joint. So, that is cut into the five sections in order to analyze a conjugate natural convection in two dimensional $r-{\theta}$ coordinate. The streamline and temperature distributions are obtained for each sections. Also the changes of those are analyzed with respect to the variation of transmission currents and cable-joint surface heat transfer coefficients. The same analyses are also shown in view point of the maximum temperature of conductor and local equivalent conductivity.

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A Novel Impedance Matching Topology for Magnetically Coupled Wireless Power Transfer

  • Lee, Gunbok;Park, Wee Sang
    • International journal of advanced smart convergence
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    • v.1 no.2
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    • pp.16-19
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    • 2012
  • A modified 4-coil magnetic resonance wireless power transfer (MRWPT) system is proposed. Four coils based on 2-coil system with additional two matching coils were used in this topology. When Tx-Rx distance is changed, the input impedance is changed. However, it can be adjusted by coil parameters of matching coils to maintain impedance matching for maximum efficiency. The equivalent circuit of MRWPT system was analyzed for both transmission function and optimum coupling coefficient of the matching coils. By using four spiral resonant coils, these design considerations was experimentally verified. The measured data agreed well with the calculated data and the transmission function of the proposed system was more efficient than that of conventional 2-coil system.

Heat Transfer Analysis of a Pulse Magnetron Sputtering Cathode (펄스 마그네트론 스퍼터링 음극의 열전달 해석)

  • Joo, Jung-Hoon
    • Journal of the Korean institute of surface engineering
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    • v.41 no.6
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    • pp.274-278
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    • 2008
  • 3-dimensional numerical analysis for a rectangular magnetron cathode model is done to predict cooling characteristics of high power sputtering system for ZnO deposition. It includes cooling channel design, heat transfer analysis of a target, bonding layer and backing plate. In order to model erosion profiles of a target, ion current density distribution from 3D Monte Carlo simulation is used to distribute total sputtering power to 5 discrete regions. At 3 kW of sputtering power and cooling water flow of 1 liter/min at $10^{\circ}C$, the maximum surface temperature was $45.8^{\circ}C$ for a flat new target and $156^{\circ}C$ for a target eroded by 1/3 of its thickness, respectively.

Effects of HTS cable Applied to the Voltage Stability Limited Power System (전압안정도 제약계통에 대한 고온초전도 케이블 적용효과)

  • Lee, Geun-Joon;Hwang, Si-Dol;Lee, So-Young;Byun, Chan-Geun
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2004.05a
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    • pp.447-450
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    • 2004
  • This paper presents the basic application idea of superconductor cable for voltage stability limited power system. In bulk power system, the transfer capability of transmission line is often limited by the voltage stability, and superconductor cable could be on of the countermeasure to enhance heat transfer limit as well as voltage stability limit. Steady state voltage stability approach by P-V curve is used to calculate the maximum transfer capability of initial system and superconductor applied system IEEE-14 bus system is used to demonstrate its applicability.

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A Study on Start·Stop System at Water Turbine-Generator for Tidal Power Plant (조력발전용 수차발전기의 기동·정지시스템에 관한 연구)

  • Oh, Min-Hwan;Park, Chul-Won
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.63 no.2
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    • pp.113-118
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    • 2014
  • Tidal power is one of new and renewable energy sources. Tidal power is generated by using the gap in the water level between the water outside and inside the embankment. All tidal power plant in Korea were being operated by import of turn-key from abroad. The know-how and technology which are the most important to build predictive control system has become increasingly difficult to obtain from advanced countries because most of them avoid to transfer, which the domestic development of the control system is needed. In this paper, a study on start stop system at water turbine-generator for tidal power plant at the beginning of development was presented. For improvement the efficiency and develope of core technology of the start stop system, the technique and characteristics of tidal power, modeling, maximum generation calculation method, and optimal control of joint control system in Sihwa tidal power plant were studied.