• Proceedings of the KIEE Conference
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• 2005.07b
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• pp.1678-1680
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• 2005

This paper presents Building Integrated Photovoltaic system of the balcony type which is influenced by conditions such as irradiation, module temperature, shade and array arrangement. When architecture component, trees and cloud shade connecting array in series, total PV array current is reduced. So, before PV system design, a planner have to simulate many situations. And then array should be composed suitable for parallel and series modules. By the results, it is very important to develop optimal design of array considering shade effect for the balcony PV system.

• Proceedings of the KIPE Conference
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• 2011.07a
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• pp.275-276
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• 2011

본 논문에서는 일사량 및 표면온도에 따라 변화하는 태양전지의 출력 특성을 고려하여 설치되는 태양광 발전 인버터의 운전 허용 범위에 대해 살펴본다. 또한 대용량 발전 시 직렬 모듈 수를 높이는 구성과 기존 센트럴 인버터의 최소 MPP 전압의 증가에 대한 효율성을 검증하기 위해 (주)카코 뉴에너지에서 제공하는 PV Array Sizing Tool과 Matlab Simulink를 통해 태양전지 어레이의 동작 범위를 파악하고, 새로운 대용량 인버터 개발 원리의 타당성을 제시한다.

• Journal of the Korean Solar Energy Society
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• v.39 no.6
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• pp.15-25
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• 2019

As the installation of photovoltaic systems increases, fire accidents of PV system grow every year. Most of PV system fires have been reported to be caused by electrical components. The majority of fire accidents occurred in combiner box, which is presumed to be short-circuit accidents due to dustproof and waterproof failures or heat deterioration of blocking diode. For this reason, the blocking diode installation became optional by revised PV combiner regulation. In this paper, according to the revised regulation, reverse current that generated by voltage mismatch was measured and analyzed in PV array without a blocking diode. The factors that cause voltage mismatch in array are assumed to be shaded PV module and short circuit failure of bypass diode. As the result of experiment, there is no reverse current to flow under shading condition in module, but reverse current flows on the failure of bypass diode in module. According to the module's I-V characteristic curve analysis, open voltage was slightly reduced due to operation of bypass diode in shading. However, it showed that open circuit voltage has decreased significantly in the failure of bypass diode. This indicates that the difference in open voltage reduction of voltage mismatch factor causes reverse current to flow.

• The Transactions of the Korean Institute of Power Electronics
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• v.10 no.1
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• pp.21-28
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• 2005

As the maximum power operating point(MPOP) of the Photovoltaic(PV) power systems alters with changing atmospheric conditions, the efficiency of maximum power point tracking(MPPT) is important in PV power systems. Many MPPT techniques have been considered in the past, but techniques using microprocessors with appropriate MPPT algorithms are favored because of their flexibility and compatibility with different PV arrays. In this paper, the author analyzes and studies two MPPT algorithms, which is named P&O(Perturbation and Observation) and IncCond(Incremental Conductance). Also, the author proposes Hysterisis-band alteration algorithm. To show the excellency of new Hysterisis-band alteration, the author suggests three references; 1) Comparing three MPPT algorithms in the steady-state condition, 2) Representing irradiation variation rapidly, 3) Showing MPPT efficiency. MPPT simulation and experiment perform in the boost converter.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.22 no.5
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• pp.86-94
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• 2008

In this paper proposed the solar tracking system to use a fuzzy based on PC in of order to increase an output of the PV(Photovoltaic) array. The solar tracking system operated two DC motors driving by signal of photo sensor. The control of dual axes is not an easy task due to nonlinear dynamics and unavailability of the parameters. Recently, artificial intelligent control of the fuzzy control, neural-network and genetic algorithm etc. have been studies. The fuzzy control made a nonlinear dynamics to well perform and had a robust and highly efficient characteristic about a parameter variable as well as a nonlinear characteristic. Hence the fuzzy control was used to perform the tracking system after comparing with error values of setting-up, nonlinear altitude and azimuth. In this paper designed a fuzzy controller for improving output of PV array and evaluated comparison with efficient of conventional PI controller. The data which were obtained by experiment were able to show a validity of the proposed controller.

• Journal of the Korean Solar Energy Society
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• v.37 no.4
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• pp.23-33
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• 2017

A great deal of study for loss reduction of photovoltaic system is conducted currently. It is hard to distinct the fault of photovoltaic system with the naked eye. For that reason, it is essential to repair and maintain the PV system by monitoring the system. The fault of individual modules can cause the huge loss of the entire system because of the mismatch. Therefore, the method of diagnosing the PV array is necessary by measuring the multi-channel arrays simultaneously. In this paper, it is presented the method of measuring I-V curve of multi-channel arrays simultaneously by using the charge and discharge characteristics of capacitor. Generated DC power at PV arrays is charged and discharged at the capacitors in a moment. By measuring the charged voltage and current, it is possible to diagnose of performance of PV arrays.

• Proceedings of the KIPE Conference
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• 2013.07a
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• pp.66-67
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• 2013

태양광전지는 태양광 에너지를 전기에너지의 형태로 변환한다. 태양광전지는 부하조건에 따라 전류원 및 전압원의 특성을 모두 갖는 I-V 특성곡선을 나타낸다. 같은 회사에서 제조한 동일한 모델의 태양광전지라 하더라도 특성에 조금씩 편차가 발생한다. 태양광전지를 직렬접속하여 대규모의 태양광어레이를 구성하는 경우, 각 태양광전지의 특성편차는 전체 태양광어레이의 전력생산능력을 감소시키게 되므로 같은 특성을 갖는 태양광전지를 구별하여 어레이를 제작할 필요가 있다. 본 논문에서는 이러한 태양광전지의 특성을 자동적으로 측정 분석하여 LabVIEW GUI화면을 통하여 결과를 출력하는 태양광전지 성능 분석기를 개발한다.

• Current Photovoltaic Research
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• v.2 no.4
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• pp.189-194
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• 2014

In this paper, We have simulated the output variation of the PV arrays installation with position & angle change. The existing 3 solar array system are $43^{\circ}$ southeast and each of the mounting angle is $17^{\circ}$. The PV output power is 240 kW. The composite studied systems in this paper arrays altered 2 PV array among 3 PV array system- the output 144kW. We simulated this system using Solar Pro ver.4.1. The simulation conditions are southwest $43^{\circ}/array$, mount angle $27^{\circ}/array$. Because the southeast have shadow effect-higher mountain The purpose of southwest $43^{\circ}$ is reduce the shadow effect. The simulation results of the suggestion design algorithm compared to 1,590 kWh/year output is increased with the southeast.

• Journal of the Korean Solar Energy Society
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• v.36 no.4
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• pp.57-65
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• 2016

Domestic photovoltaic system for roof-top is installed towards the south at an angle of 20 to 35 degrees and the shape of PV array is divided into two kinds; a plane shape and a curved shape. This paper aims to understand an actual condition of PV facility and strengths and weaknesses of support structure production and installation and to consider the best PV surface shape by analyzing theoretical logics of these two surface shapes and architectural perspective-based realistic case studies. This study targeted 98 facilities including common houses, public institutions and education institutions. In common houses, all of 59 PV facilities have a plane surface. In public institutions, 7 of 15 PV facilities have a curved array surface and 8 PV facilities have a plane surface. In education institutions, also, 14 of 24 PV facilities have a plane array surface and 10 PV facilities have a curved surface. Most of 98 facilities have a flat roof supporting shape. However, it was found that the curved shape wasn't positive for PV generation due to the change of radial density and it was at least 10 % more expensive to produce its structure. Also, domestic general large single-plate PV facilities have problems of harmony with buildings and wind load. Therefore, it is considered that for fixed-type roof-top PV, a plane PV array shape is good for optimum generation and economic efficiency and a parallel array structure on the roof surface is favorable to wind load and snow load without being a hindrance to the building facade.

• Proceedings of the KIPE Conference
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• 2010.11a
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• pp.271-273
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• 2010

태양광발전시스템에서 PV모듈이나 어레이의 성능특성 및 성능추정이 요구되고 있다. 태양광 발전 모듈은 장기간 사용 시 환경 요인 등으로 효율이 나빠지며 어레이의 특정 모듈 효율저하는 전체 발전 전력의 감소를 초래하므로 실시간 감시가 필요하다. 이 논문은 태양광 발전 모듈의 발전 전력을 실시간으로 측정하기 위한 것이다. 모듈의 출력을 실시간으로 측정하기 위해 전압, 전류 측정 회로를 제작하고 온도, 일조량 측정 장치를 제작하여 RS485 통신으로 연결하였다. Visual Studio - Basic .Net(2005)과 NI사의 Measurement Studio를 이용하여 실시간 모니터링 프로그램을 제작하였고, 모듈들 사이의 상대적인 발전 출력을 비교하여 효율 저하가 의심되는 모듈을 실시간으로 탐색하였다. 20개 모듈의 직병렬로 구성된 1kW 태양광 발전체에 적용하여 시험한 결과 2개의 모듈에서 성능 저하가 의심되는 결과가 확인되었다.