• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.328-330
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• 2001

The construct of photovoltaic module array, main power source of photovoltaic system, is very important to the efficiency improvement of whole photovoltaic system. Photovoltaic modules are usually connected in series or parallel to meet power capacity required. Since output characteristics of a photovoltaic module are greatly fluctuated on the variation of insolation, temperature and its type, the maximum open circuit voltage and output operating voltage of photovoltaic module array must exist in the admissible input voltage range of inverter system under any operating conditions. In this paper, we present the selection and array method of photovoltaic modules through simulation for the coupling loss reduction between photovoltaic modules and a inverter.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2009년도 추계학술대회 논문집
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• pp.263-266
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• 2009

In the photovoltaic applications, MPPT(maximum power point tracking) method is essential due to the non-lineality of photovoltaic output characteristics. To ensure stable tracking response, two sensors are required in conventional popular MPPTs. In modularized PV system as an AC module system, the cost of a sensor can have an effect on entire system cost because a power conditioning device is connected in a PV module. Because only a current sensor is required for proposed MPPT, it is helpful in the cost reduction point of view. In this paper, a novel MPPT using current sensor is proposed In the proposed MPPT, the voltage is derived from sensed current value. The proposed method is verified by simulation results.

• Journal of Advanced Marine Engineering and Technology
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• 제32권8호
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• pp.1123-1128
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• 2008

Marine facilities like buoy, lighthouse are operated with stand alone power supply system. This power system can consist of a stand-alone type power system such as PV(Photovoltaic) system, wave system or hybrid system which is not cooperated with a commercial power system. Generally, PV power system for marine facilities can not supply a sufficient power to buoy, because it is so influenced from weather condition. For solving this problem the hybrid power system with PV and wave is studied on a various area, that is why a hybrid power system is requires to overcome these problems. This paper will describe a generation characteristic of WEC(Wave Energy Converter) for buoy, and an AFS(Anti-Fouling System) influence on WEC.

• 전력전자학회논문지
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• 제16권6호
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• pp.618-626
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• 2011

태양전지는 미래에너지를 위한 중요한 신재생에너지원이다. 본 논문에서는 태양광 발전 (PV PCS)를 위한 2단구성 DC/DC컨버터와 동작제어를 제안한다. 넓은 입력전압 제어범위를 갖는 제안된 DC/DC컨버터는 1차 병렬 2차 직렬로 연결된 Two Tank LLC공진컨버터와 Interleaved 승압 컨버터로 구성되어있고, 태양광모듈 전압범위에 따라 하나의 시스템 또는 두 개의 시스템으로 동작시켜 전체 평균효율을 증가시키는 방법을 제안한다. 제안된 컨버터에 대한 동작특성에 대해 분석, 서술되어 있으며, 2.2kW급 시제품 제작 및 실험을 통하여 적용 가능함을 보였다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2003년도 춘계전력전자학술대회 논문집(2)
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• pp.707-710
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• 2003

3kW grid-connected photovoltaic (PV) system and data acquisition system are constructed for performance analysis of PV system at field demonstration test center of Gwang-Ju in Korea. As climatic and irradiation conditions are varied, operation characteristics of the PV system are collected and analyzed in data acquisition system. From these results, the performances of PV system have simulated and evaluated using simulation tool in comparison with actual value of data acquisition system of field demonstration test center. Furthermore, performance of total PV system e.g. electric power and loss factor at the site are reviewed.

• 한국태양광발전학회지
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• 제6권1호
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• pp.86-91
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• 2020

Nepal is among the richest in terms of water resource availability and it is one of the most important natural resources of the country. Currently, 72% of the population is electrified through the national grid system. The power generation mix into the grid is hydro dominated with minor shares generated from solar and thermal (accounts for less than 1%). To achieve sustainable development in the power sector it is essential to diversify power generation mix into the grid. Knowing the facts, the government has a plan to achieve a 5-10% share of power generation from solar and mix it into the grid system. Solar is the second most abundant, prominent and free source of renewable in the context of Nepal. This study mainly focuses on the grid-connected solar system, its importance, present status, government efforts, and its need. It is based on the review of literature, news published in national newspaper online news and international organization's report.

• KIEAE Journal
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• 제12권6호
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• pp.129-134
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• 2012

The lightshelf system, a daylighting device, has been applied to improve the visual environment by optimal light distributions and intense illumination levels of a interior. Also, The photovoltaic is one of the most important sustainable technologies appliable to architectures. This study aims to evaluate the performance of photovoltaic integrated lightshelf system. For the study, the 1/5 scaled office models were made and the field tests were experimented under clear sky conditions. The power ratio has been analyzed to evaluate the performance of photovoltaic integrated lightshelf system. As results, the power performance was high on photovoltaic lightshelf installation angle $0^{\circ}$. And the performance was reduced on 23(%) by installation angle $15^{\circ}$ and 63(%) by installation angle $30^{\circ}$.

• 한국태양에너지학회 논문집
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• 제35권6호
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• pp.9-15
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• 2015

In this paper, a parallel operating technique for the stand alone photovoltaic (PV) power conditioning system (PCS) is proposed. The proposed parallel operating technique can increase the power rating of the system easily. Also, it provide three-phase connection function. The proposed technique does not separated master and slave system. Also, it does not use the separated synchronization line. Therefore, the PCS can supply continuous power even if one of the PCS breaks down. This technique is composed of a phase locked loop (PLL) control, droop control, current limit control and etc. Experimental result obtained on 2-kW prototype to verify the proposed technique.

• 한국정보전자통신기술학회논문지
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• 제14권1호
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• pp.56-69
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• 2021

상용계통과 연계한 PV 시스템은 인버터의 특성과 더불어 소형, 고 역률, 낮은 고조파 출력, 고 신뢰성, 최대출력 운전, 저비용 등의 장점이 요구된다. 태양광발전시스템의 PV 에너지를 계통과 부하로 전달하기 위해 양방향의 PCS가 요구되어 진다. 본 논문에서는 태양광 발전의 ESS를 고려한 PCS를 제안하여 부하평준화를 통한 전력의 안정적인 공급을 확인하고자 한다. 이를 위해 일사량과 부하량에 따른 5단계의 동작 모드 알고리즘을 제안하고, 충/방전 제어를 위한 제어기를 설계 하였다. 양방향의 효율적인 에너지 전달을 위해 DC-link단에 양방향 컨버터 및 배터리를 연결하고, 연계형 인버터를 통해 DC-link 전압 및 인버터 출력전압을 제어하였다. 제안된 시스템의 타당성을 입증하기 위해 PSIM을 사용한 시뮬레이션을 수행하여 타당성과 안정성을 검토하였으며, 이를 확인하기 위해 3[kW] PCS를 제작하여 실험하였다. 실험결과를 통해 제안된 시스템에 요구되어지는 특성을 검증하였으며 기존 시스템에 비해 강인한 시스템을 구성하였다.

• 한국인터넷방송통신학회논문지
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• 제19권2호
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• pp.175-180
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• 2019

스트링 인버터의 정격전력이 낮은 단점을 보완하기 위하여 전력변환장치(PCS: Power Conditioning System)를 마이크로 인버터를 사용하여 기존 PCS와 비교하여 마이크로 인버터의 필요성과 향후의 발전 방향을 고찰하고자 한다. 현재 가정용 태양광발전 시스템에서는 스트링 인버터를 사용해 왔으며 유럽을 시작으로 스트링 인버터의 단점을 보완할 수 있는 마이크로 인버터(PV-MIC)의 연구 및 보급률이 확장 되고 있는 실정이다. 그러나 국내 태양광인버터 업계에서는 태양광발전용 마이크로 인버터(PV-MIC)에 대한 정확한 기술기준 및 시험 측정 장비 및 관련 시험방법 부재가 제품 개발에 걸림돌이 되고 있다. 따라서 본 논문에서는 마이크로 인버터(PV-MIC)의 특성을 고려하여 시험측정 장비 및 관련 기술기준 연구를 통해 선진기술 변화에 뒤쳐지지 않도록 경쟁력을 갖출 수 있는데 목적을 둔다.