• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.1041_1042
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• 2009

본 논문에서는 연료전지 태양광 복합발전시스템의 2가지 전력제어 알고리즘을 제안하고 각각의 성능을 비교 분석하였다. 태양광의 MPPT제어 위치에 따라 2가지 전력제어 알고리즘이 적용되었으며 각 알고리즘에 따른 MPPT성능, DC link 안정성과 출력전력 특성이 비교 분석되었으며 시뮬레이션 및 실험을 통해 타당성을 검증하였다.

• New & Renewable Energy
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• v.1 no.2 s.2
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• pp.11-18
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• 2005

A modular photovoltaic PCS with high-frequency isolation is proposed. The proposed system consists of a SEPIC converter and a full-bridge inverter Using the power slope versus voltage of the PV array, the MPPT controller is proposed that produces a smooth transition to the maximum power point. The dc current of the PV array is estimated without using a dc current sensor The disturbance of the line voltage is detected using a fast sensing technique. Experimental results obtained on a 500W prototype show high performance such as almost unity power factor, $90\%$ power efficiency, $3.6\%$ THD.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.56 no.1
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• pp.106-111
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• 2007

In this study, we designed a digital fuzzy logic controller based on FPGA and microprocessor for MPPT of the sofar power generation system. A fuzzy algorithm to control the power tracking function of a boost converter has been built into the FPGA, and applied to the small scaled solar power generation system. The embodied controller showed a stable operation characteristic with the small output voltage ripple for the intensity change of solar radiation. This result proves that the implementation of the power tracking controller using FPGA is an effective way compared to the existing one using microprocessor.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.27 no.12
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• pp.1-9
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• 2013

A standalone LED lighting system in using solar energy has been used usually less than 70W of lighting power because of a troublesome installation and maintenance. In this system, as more and more LED lighting power increases, the capacity of photovoltaic panel does proportionally, and to improve the charging efficiency of solar energy, MPPT(Maximum Power Point Tracking) techniques is used frequently, but the solar tracker is not. In this paper, a solar tracker which traces the light of the sun in varying hour to hour is studied to apply to the standalone LED lighting system. This solar tracker consists of twin axis for tracing the azimuth and altitude respectively, and it has a robust structure with safe mode to stand a strong wind. As a result of analysis, generating efficiency of the traced type has improved on the fixed one 28.84% on average.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.51 no.8
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• pp.467-474
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• 2002

In this paper, a wind power simulator is designed and implemented. To realize the torque of wind blade, a DC motor is used as a variable torque input device. An induction machine is used as a generator of which speed is controlled to maintain the optimal tip speed ratio during wind speed change. Input torque of system is controlled by armature current of DC motor and speed is controlled by generator control unit using field oriented control algorithm. Various control algorithms such as MPPT, soft start up, the simulator reactive power control, can be developed and tested using the simulator.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.59 no.10
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• pp.1845-1849
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• 2010

We have proposed and fabricated a Buck-Boost DC to DC Converter for Thermoelectric generator (TEG) with constant output voltage suitable for battery chargers or constant voltage supplies in the range of several watt. The experimental and simulation results have shown that the proposed method allows stable operation with maximum 86% power transfer efficiency. The proposed circuit has a merit in cost and miniaturization of a system compared to conventional MPPT algorithms, because the proposed method adopts only analog circuit without DSP or micro controller unit for calculating peak power point by iterative methods.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.58 no.12
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• pp.2379-2384
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• 2009

In this paper, based on MATLAB which has characteristic that is simply applied to control algorithm and source modeling, photovoltaic modeling is implemented. Photovoltaic modeling is similarly performed PV array and simulated. Also, in order to output maximum power of PV, MPPT control is simulated. Moreover, simulation of converter is performed by means of PLECS (Piece wise Linear Electrical Simulation) which is easily made schematic of power electronics. Also, we compare simulation results and Sharp PV module and Suntech PV module. Finally, informative simulation of PV generation system is provided.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.1093-1094
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• 2008

본 논문은 수학적 모델링이 간편하고 제어기법의 적용이 쉬운 MATLAB 기반으로 태양광 셀과 모듈을 모델링하고 기존의 P&O MPPT제어 알고리즘을 분석하고 구현하였으며 전력전자 회로의 구현이 간단한 PLCES를 사용하여 부스트 컨버터 구현하였다. 이로써 일사량 변화와 온도변화의 영향이 고려되고, MATLAB 기반이므로 시뮬레이션 시간이 단축되며, 다양한 제어기법을 쉽게 적용할 수 있는 PV 발전시스템을 구축하였으며 시뮬레이션을 통해 태양광 모델의 성능과 MPPT 제어 성능을 검증하였다

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.141-142
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• 2015

풍력발전은 신재생에너지 분야에서 태양광 발전과 함께 중요한 에너지원으로서 최대 전력 생산과 전력계통에 대한 적용 문제를 다루기 위해 상당한 노력들이 기울여지고 있는 분야인데, 발전기가 풍속에 따라 최대전력을 생산할 수 있는 속도를 추적해야 하는 어려움이 따른다. 본 논문에서는 풍력발전기의 출력방식을 조사하고 최대출력을 얻기 위한 MPPT출력제어방식에 대하여 조사하고, 풍력발전시스템의 전력계통에서의 적용성을 높이기 위한 기술요소를 제시한다.

• Proceedings of the KIPE Conference
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• 1998.10a
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• pp.966-971
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• 1998

The studies on the photovoltaic system are extensively exhaustible and broadly available resourse as a future energy supply. In this paper, a new maximum power point tracker(MPPT) using neural network theory is proposed to improve energy conversion efficiency. The boost converter and neural network controller(NNC) were employed so that the operating point of solar cell was located at the Maximum Power Point. And the back propagation algorithm with one input layer of two inputs(E, CE) and output layer(cnntrol value) was applied to train a neural network. Simulation and experimental results show that the performance of NNC in MPPT of photovoltaic array is better than that of controller based upon the Hill Climbing Method.