• Proceedings of the KAIS Fall Conference
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• 한국산학기술학회 2009년도 추계학술발표논문집
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• pp.640-644
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• 2009

현재 태양광 산업에서는 고정식 태양광 발전장치보다 발전 효율이 우수한 추적식 태양광 발전장치를 개발하는 연구가 활발하게 진행되고 있다. 추적식 태양광 발전장치는 고정식에 대비하여 단위면적당 일사량을 최대로 유지할 수 있을 뿐만 아니라, 일조시간을 최대로 하여 태양전지의 발전효율을 극대화할 수 있다. 따라서 정밀하면서도 저렴한 태양위치 추적장치는 태양광 발전사업의 경제성을 높이고, 성능 대비 투자비용을 낮춰 태양광 발전설비의 보급을 촉진시켜줄 수 있는 중요한 기술이다. 본 연구는 태양위치를 감지하는데 센서를 사용하지 않고 천문학과 수학을 이용하여 정밀도 1분($0.016^{\circ}$)이내의 태양위치를 계산하는 알고리즘에 관한 것이다. 본 연구에서 제안하는 알고리즘은 장치의 제작비용을 낮추어 줄 뿐 아니라, 발전효율도 높여준다. 구현된 알고리즘을 적용시킨 추적식 태양광 발전장치를 운용 실측한 결과, 최대 30초($0.0038^{\circ}$)의 오차를 보여 추적식 발전장치의 경제성을 높일 수 있고, 시간복잡도(Time Complexity)와 공간복잡도(Spatial Complexity)가 낮아 실시간 태양 추적장치에 최적임을 확인하였다.

• Solar Energy
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• 제18권3호
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• pp.25-30
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• 1998

A sun tracking controller for PTC(parabolic trough concentrator) is a control system used to orient the concentrator toward the sun always, so that the maximum energy can be collected. The work presented here is a design and development of microprocessor based sun tracking control system for PTC. Sun tracking control system consists of a sun sensor and a single axis tracking control system. 80c196KC based control system consists of an analog input unit, 24V DC servomotor drive unit, I/O unit. Sun sensor has been constructed using photodiode and can detect the sun located within ${\pm}50^{\circ}$ measured from the sun sensor normal direction. The sun tracking system developed is being implemented and shows a good sun tracking performance.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2010년도 춘계학술대회 초록집
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• pp.92.1-92.1
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• 2010

본 기술개발은 기존 태양추적기의 구조를 크게 변화시킬 수 있는 무선망 활용 태양추적기 개발에 관한 내용이다. 기존의 태양추적기는 태양광어레이에 스탠드얼론 시스템으로 부착되어 태양추적 및 관련 제어기능을 수행한다. 그러나 본 무선망활용 태양추적기는 PC와 태양광어레이가 지그비 무선망으로 연결되는 구조이다. 무선망을 활용함으로서 기존 태양추적기 대비 제어모듈의 역할이 매우 단순화되어 장치의 강건함, 내구성 및 경제성이 증가되는 효과가 있다. 무선망을 활용함으로서 태양광에레이 측은 무선데이터 송수신 기능과 모터제어 부분만 구현되어도 되며 나머지 기능들은 PC에서 처리해서 무선으로 태양광에레이 모듈에게 전달된다. 또한 고가의 센서 등도 PC에만 구현되고 필요한 데이터는 PC에서 처리하고 계산해서 무선으로 태양광어레이에게 전달하는 구조이다. 그리고 태양추적을 위한 정밀한 자동제어 알고리즘도 PC에서는 충분히 구현할 수 있으며 이를 수행한 후 필요 데이터를 태양광어레이 모듈에게 무선으로 전달한다. 본 기술개발 내용에 대한 시제품이 완성단계에 있으며 필드테스트 수행을 준비하고 있다.

• Journal of Energy Engineering
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• 제20권4호
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• pp.353-357
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• 2011

An embedded two-axis solar tracking system was developed by using AVR micro controller for enhancing solar energy utilization. The system consists of an Atmega128 micro controller, two step motors, two step drive modules, CdS sensors, GPS module and other accessories needed for functional stability. This system is controlled by both an astronomical method and an optical method. Initial operation is performed by the result from the astronomical method, which is followed by the fine controlled operation using the signals from Cds sensors. The GPS sensor generates UTC, longitude and latitude data where the solar tracker is installed. A database of solar altitude, azimuth, and sunrise and sunset times is provided by UART (Universal Asynchronous Receiver/Transmitter).

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 한국정보통신학회 2012년도 추계학술대회
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• pp.1023-1025
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• 2012

Solar energy is rapidly gaining notoriety as an important means of expanding renewable energy resources. As such, it is vital that those in engineering fields understand the technologies associated with this area. My project will include the design and construction of a microcontroller-based solar panel tracking system. Solar tracking allows more energy to be produced because the solar array is able to remain aligned to the sun. This system builds upon topics learned in this course. Performance and usefulness of a solar tracking device that was designed and produced in this study was confirmed through experiments.

• Journal of the Korea Academia-Industrial cooperation Society
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• 제17권11호
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• pp.294-301
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• 2016

Recently, the solar tracker has been used to improve the efficiency of solar energy. Solar tracking technologies are classified into the sensor-based method, the program-based method, and the hybrid method. Solar trackers using an AC motor and CdS sensor are low in cost, but the precision of the positions is low, owing to the inertia of the motor and the scattering of sunlight. To compensate for the low precision, we implement a CdS sensor module and propose an AC motor control method using error value. To evaluate the performance of the solar tracker, we implemented a solar water heater. From the experimental results, the solar tracker can achieve ${\pm}2mm$ accuracy for sun, can satisfy ${\pm}15mm$ as a limited error value, and provides a 32% performance enhancement in KSB8202 criteria.

• Journal of Energy Engineering
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• 제19권2호
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• pp.128-135
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• 2010

This paper introduces step by step procedures for the fabrication and operation of an embedded solar tracker. The system presented consists of application software, compactRIO, C-series interface module, analogue input module, step drive, step motor, feedback devices and other accessories to support its functional stability. CompactRIO that has a real-tim processor allows the solar tracker to be a stand-alone real time system which operates automatically without any external control. An astronomical method and an optical method were used for a high-precision solar tracker. CdS sensors are used to constantly generate feedback signals to the controller, which allow a solar tracker to track the sun even under adverse conditions. The database of solar position and sunrise and sunset time was compared with those of those of the Astronomical Applications Department of the U.S. Naval Observatory. The results presented here clearly demonstrate the high-accuracy of the present system in solar tracking, which are applicable to many existing solar systems.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• 제22권6호
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• pp.89-99
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• 2008

In this paper proposes a novel tacking algorithm regarding the power loss when operating a tracking system for a rapidly changing insolation to improve the power of PV hacking system. The tracking system of sensor method used in a conventional PV power station is unable to exactly track a sun position when lacking in the intensity of radiation and has the problem is malfunction of tracking system by a rapidly changing climatic. The tracking system of program method spends too much energy on the unnecessary operation of tracking system because that is unable to adapt itself to a outside factor of climatic environment. In case of tracking an azimuth and altitude of the sun in realtime, therefore, the actual PV power is less increasing than the power of tracking system fixed a specific position. To reduce the power loss, this pap proposes a novel control algorithm of the tracking system. Also, this paper is analyzed efficiency of traditional solar tracking method and proposed method, prove validity of proposed algorithm through demonstrable study.

• Journal of the Korean Society of Marine Environment & Safety
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• 제21권5호
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• pp.531-537
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• 2015

In order to maximize power output from the solar panels, one needs to keep the panels aligned with the sun. So solar tracker having high reliability must be designed. This paper cares about the design and evaluation of a two-axis solar tracker system based on fuzzy logic control with LabVIEW. The research focus on planning mechanical parts, making an intelligent controller which controls and monitors all parameters via user interface implemented of a fuzzy decision support system for control of photovoltaic panel movement. We also develop a real solar tracker system and analyze the influence indexes such as environment, weather, season, and light condition. The solar tracker is tested in real condition and all parameters related to the system operation are recorded and analyzed. The developed solar tracking system got a much higher efficiency about 38 % compare to fixed solar panel although the weather condition is affected a lot to the solar panel. So we confirmed the our auto tracking system is more effective and can allow more energy to be produced.

• The Transactions of the Korean Institute of Power Electronics
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• 제11권6호
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• pp.508-519
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• 2006

In solar power system, the height and azimuth of the sun are important parameters which control generated power magnitude. The tracking method that controls the daily generation magnitude according to latitude and longitude using the two axles is often used in the existing sunlight tracking system today. In this two-axle PV track control system, the self-load is concentrated on one FRAME. It is influenced of the regular load, snow load and the wind load, etc. It is difficult to set up the system in the conventional building. This research is a development about the small-scale economy track device of independent load-dispersing solar generation system. The position tracking algorithm is through the new coordinates transformation calculating the height and azimuth of the sun.