• 한국ITS학회 논문지
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• 제10권1호
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• pp.124-130
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• 2011

본 논문에서는 태양광 전력 시스템을 이용해서 홈 네트워크 시스템을 구성하는 방안으로 정전시 제한된 전력을 효율적으로 사용하는 방법을 연구하였다. 그리고 기존의 홈 네트워크 시스템의 단말기가 하나의 고유 기능만을 갖기 때문에 생산 단가가 높고 다른 기능으로의 변환이 어려운 문제점이 있으므로, 단말기가 하나의 기능을 갖는 것이 아니라 다른 기능으로의 변환이 쉽고 생산 단가를 낮출 수 있도록 모듈화하고 PLC를 사용하여 설비 단가도 낮출 수 있는 홈 네트워크 시스템을 제안하였다. 실험적으로 시제품 형태의 조명 제어 단말기를 구현하였으며, 이를 통해 모듈화된조명제어 시스템의 성능을 시험하였으며, 상품가능성을 입증하였다.

• 조명전기설비학회논문지
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• 제28권9호
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• pp.14-19
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• 2014

Recently, many renewable energy generating businesses are ongoing progress due to the introduction of the RPS(Renewable Portfolio Standards) as well as the needs of environmentally friendly energy resources. Researches on photovoltaic system are actively being processed since the photovoltaic system is relatively easy to install and becomes commercialized in many domestic application areas. Furthermore, the floating photovoltaic system is likely to be installed more actively since the conventional photovoltaic system requires relatively large areas of land. Also, the floating photovoltaic system is more efficient than photovoltaic system installed in land due to the operation in lower temperature. However, safety problems such as electric shock could arise since the cable should be installed in the water. In this paper, the leakage current and the voltage rising are measured and analyzed for the case when the cables are damaged connecting the floating photovoltaic system to the grid.

• 조명전기설비학회논문지
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• 제23권1호
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• pp.41-48
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• 2009

본 논문은 DC 전동기에 공급되는 PV 시스템의 최대전력점추적에 대한 신경회로망 제어기를 제시한다. 다양한 일사량은 PV 시스템의 MPPT에 대하여 가장 중요한 요소이다. 일사량은 비선형적, 비주기적이고 복잡하다. 신경회로망은 복잡한 수학적 문제를 해결하는데 광범위하게 사용되고 있다. 제안한 태양광 발전시스템은 신경회로망 제어기, DC-DC 컨버터, DC전동기, 부하로 구성되어 있다. 신경회로망 알고리즘은 컨버터의 쵸핑비를 계산하고 DC-DC 컨버터에 적용된다. 신경회로망의 출력은 수학적 모델링에 의해 계산된 값과 비교하고 알고리즘의 타당성을 제시한다.

• 조명전기설비학회논문지
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• 제29권3호
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• pp.45-53
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• 2015

A I-V and P-V characteristic of solar cell is changed to nonlinear by radiation and temperature. Therefore, to use efficiently PV system, operating point of PV system is must operate at maximum power point always. A performance of conventional the PO and the IC method is depend on the step size. So it has weakness which is must select optimal step size. Also, MPPT control applying PI and fuzzy control is not expected satisfactory performance, because of PI controller has fixed gain and fuzzy control has cumulative error by an integral calculus. Therefore, this paper proposes the VS-PO(Variable Stepsize - Perturbation & Observation) MPPT control that is automatically adjusted the step size according to the operating conditions. The VS-PO MPPT method proposed in this paper analyzes control characteristic about condition of radiation and compares with conventional methods. The validity of this paper proves using this results.

• 조명전기설비학회논문지
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• 제28권2호
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• pp.31-41
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• 2014

This paper proposes the configuration of photovoltaic(PV) module considering the environment conditions of the PV system. The PV system is consisted of the series-parallel connection of the PV module. When shadows or changes of the radiation or an electrical characteristic in the solar cell are happened to PV system, the serious power loss will occur. If the PV module connected in series has the shadows, the output current is restricted to current of shaded PV module. Also if shadow is occurred to the parallel connection PV module, the output voltage is limited to voltage of shaded PV module. These problems are caused power loss. Therefore, this paper proposes the method that makes the output power of the PV module equalize by reconfiguration of PV module using the switching considering these environment conditions. A validity of the method proposed in this paper proves through comparing with performance of conventional PV module.

• 조명전기설비학회논문지
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• 제28권2호
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• pp.9-18
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• 2014

This paper proposes the fuzzy PI controller for maximum power point tracking(MPPT) control of photovoltaic system. The output characteristics of the solar cell are a nonlinear and affected by a temperature, the solar radiation. The MPPT control is a very important technique in order to increase an output and efficiency of the photovoltaic system. The conventional perturbation and observation(PO) and incremental conductance(IC) are the method which finding maximum power point(MPP) by the continued self-excitation vibration, and uses the fixed step size. If the fixed step size is a large, the tracking speed of maximum power point is faster, but the tracking accuracy in the steady state is decreased. On the contrary, when the fixed step size is a small, the tracking accuracy is increased and the tracking speed is slower. Therefore, this paper proposes the MPPT control using the fuzzy PI controller that can be improve a MPPT control performance. The fuzzy PI controller is adjusted a input of PI controller by fuzzy control and compensated a cumulative error of fuzzy control by PI controller. The fuzzy PI MPPT control is compared to conventional PO and IC MPPT method for various temperature and radiation condition. This paper proves the validity of the fuzzy PI controller using these results.

• 조명전기설비학회논문지
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• 제28권10호
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• pp.95-100
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• 2014

To solve the problem of conventional fossil energy, utilization of renewable energy is growing rapidly. Solar energy as an energy source is infinite, and a variety of research is being conducted into its utilization. To change solar energy into electrical energy, we need to build a solar power plant. The efficiency of such a plant is strongly influenced by meteorological factors; that is, its efficiency is determined by solar radiation. However, when analyzing observed generation data, it is clear that the generated amount is changed by various factors such as weather, location and plant efficiency. In this paper, we proposed a solar power generation prediction algorithm using geographical factors such as latitude and elevation. Hence, changes in generated amount caused by the installation environment are calculated by curve fitting. Through applying the method to calculate this generation amount, the difference between real generated amount is analyzed.

• 조명전기설비학회논문지
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• 제24권1호
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• pp.105-111
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• 2010

본 논문에서는 배터리전원 또는 태양광과 연료전지 등의 신재생 전원에서 발생되는 저전압 에너지원을 고전압으로 변환하기 위한 DC-DC 컨버터의 설계에 대해 연구하였다. 입력 DC24[V] 전압을 출력전압 400[V]로 변환하기 위한 H-브리지 컨버터의 회로 토폴로지에 있어 출력측 전력 및 전압을 제어하기 위해 위상천이제어를 적용하여 구현하였다. 제안된 컨버터 시스템의 장점으로는 전류 스트레스 감소 및 높은 효율성, 신뢰성 및 단순화된 관리뿐만 아니라 저렴한 비용 등을 들 수 있으며, 가정용 전력 생산을 위한 시스템으로 매우 유용하다는 것을 알 수 있었다.

• 조명전기설비학회논문지
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• 제26권9호
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• pp.33-39
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• 2012

For photovoltaic power generation need certainly decreasing module's price and increasing promote efficiency technology. Almost of solar panel is on the decrease energy efficiency since 2,000. like silicone(Si) solar panel, thin film solar panel and etc. Silicone(Si) solar panel was best efficiency in 1999. It's 24%. But after that time, It didn't pass limit of energy efficiency. That's why, nowadays being issued that using III-V compound semiconductor to high efficiency of concentrating photovoltaic system for making an alternative proposal. In Korea, making researches in allied technology with III-V compound semiconductor solar panel, condenser technology, and solar tracker. but feasibility study for concentrating photovoltaic power generation hasn't progressed yet. This thesis made a plan about CPV(Concentrating Photovoltaic)system and CPV has a higher energy efficiency than PV(Photovoltaic)system in fine climate conditions from comparing CPV with using silicone(Si) solar panel to PV's efficiency test result.

• 조명전기설비학회논문지
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• 제25권10호
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• pp.76-86
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• 2011

This paper proposes novel algorithm for anti-islanding of grid-connected photovoltaic(PV) inverter. The islanding of PV systems can cause a variety of problems such as deterioration in power quality and electric shock. To prevent islanding, many anti-islanding methods are researched. Typical methods of anti-islanding are active frequency drift(AFD) and active frequency drift positive feedback(AFDPF). However, the AFD has problem that widely exists non diction zone(NDZ). The AFDPF is a method that improves the AFD method and is detected islanding by changing the chopping fraction(cf). However, The AFDPF does not detect when cf is very small and does not satisfy the IEEE Std. 929-2000 when cf is very big. Therefore, this paper proposes novel anti-islanding method that is simple to implement using virtual resister. The anti-islanding method proposed in this paper is compared with conventional method. The validity of this paper is proved using this result.