• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.325-327
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• 2001

So far, because the photovoltaics power generation system can be treated to a harmonics source for the power distribution systems, the PV system combined the function of AF systems as well as the AF systems using the PV module as the power source have never been reported. However, authors have recently proposed a novel concept of the photovoltaics power generation system adding the function of the active filter (PV-AF system). In this paper, in order to confirm the operational characteristics of the PV-AF system, various MPPT controls are applied and analyzed.

• KEPCO Journal on Electric Power and Energy
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• 제8권2호
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• pp.151-157
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• 2022

The transition to renewable energy, especially the expansion of photovoltaic (PV) generation, has become a global megatrend that can no longer be reserved. However, since the site for PV is limited, it is necessary to use the land efficiently. As an alternative, the concept of utility scale agricultural PV(UAPV) is a technology that continues farming in the lower part and installs PV in the upper part of farmland to efficiently use the land. Therefore, for UAPV, the growth of crops in the lower part and the optimal operation of PV in the upper part are important. In this, we analyze the characteristics of the upper PV generation system in the UAPV based on the empirical results under various conditions, and propose future research directions of the UAPV.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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• pp.468-468
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• 2000

In our laboratory, the control aspects are investigated in the photovoltaic power generation systems (PV systems). The PV system is very good for earth environment, but if it connects to power network system, many problems are raised (protection, voltage, harmonics etc.). In this paper, we present the result of the basic studies for the building of the PV system that amplifies the electric energy obtained from the solar cell. We consider electronic circuits in order to protect the PV system from power surge induced by lightning and also design an electronic circuit in order to detect defaults in the power network system. We would like to integrate these circuits into the PV system by considering its control equipment build by 8-bit microcomputer using various control theory (fuzzy, neural network etc.).

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 제37회 하계학술대회 논문집 B
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• pp.1169-1170
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• 2006

Grid connected PV(Photovoltic) generation systems are becoming and actual and general. The power output of PV system is directly affected by the weather conditions. And when AC power supply is needed, power conversion by an inverter and a MPPT control are necessary. The PV power generation system can be treated to a harmonics source for the power distribution system. So, the PV system combined the function of active filter system can be useful applied in power distribution system. AF(Active Filters) intended for harmonic solutions are expending their functions from harmonic compensation of nonlinear loads into harmonic isolation between utilities and consumer. With the test analysis of the proposed control strategy of PV-AF system, the outcome of the test shows the stability and effectiveness of the proposed PV-AF system. The various capability of AF has been proved in previous research and usage. In this paper, authors present a DSP controlled PV-AF system for power conditioning in three-phase industrial or commercial power systems and verify it through experimental results.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2005년도 전력전자학술대회 논문집
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• pp.64-67
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• 2005

Many anti-islanding methods have been developed and tested in pratice. Generally, it seems to be possible to include effective and reliable anti-islanding methods in the PV inverter However, it is difficult to detect islanding phenomenon in the case of multiple systems in the same distribution line. In this paper, the islanding possibility of distributed PV generation system is analyzed and discussed to detect islanding phenomenon.

• 한국인터넷방송통신학회논문지
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• 제24권4호
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• pp.135-140
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• 2024

태양광발전시스템은 다른 재생에너지원과 비교해서 내구수명이 길어 유지점검이 거의 필요 없다고 하지만, 실제 태양광 모듈의 음영 발생, 온도상승, 미스매치, 오염·열화, 태양광 인버터의 고장, 누설전류 및 아크 발생으로 인하여 초기 설계 시에 기대했던 성능이 나오지 않는 경우가 발생한다. 따라서 이러한 시스템의 문제점 해결을 위해 단지 발전량 및 운전 현황에 대한 조사를 통하여 정성적으로 파악하거나 태양광발전시스템의 성능지수인 성능계수(PR, Performance Ratio)로부터 성능을 비교분석하고 있다. 그러나 큰 손실을 포함하고 있으므로 단지 성능계수만으로 태양광발전시스템의 성능 저하, 고장 혹은 결한 등의 이상 유무를 정확하게 판단하기가 어렵다. 본 논문에서는 주변 환경의 변화에 따른 태양광발전시스템 발전량 최적화를 위해 태양광 모듈의 음영 발생, 인버터 고장, 누설 및 아크에 대한 상태 진단 알고리즘을 연구하였다. 또한 연구된 알고리즘을 이용하여 영역별 상태진단과 이에 따른 발전량 최적화 운전에 대한 실증시험을 통한 결과를 고찰하였다.

• 조명전기설비학회논문지
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• 제25권2호
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• pp.1-9
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• 2011

Daylight provides residents with good visual environment. And available daylight in inside provides positive influence on psychological and physiological aspects. Also, sunlight can be converted directly into electricity using PV(photovoltaic) power generation. This study was to analyze characteristics of daylight distributions, calculate an amount of solar radiation and a PV power generation on the building facade using Radiance and Ecotect simulation programs. Ultimately, the purpose of this study is to verify the applicability of Blind PV systems.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 제37회 하계학술대회 논문집 A
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• pp.18-19
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• 2006

The recent interest in distributed generation (DG) due to the opening of the electricity market and the need for alternatives to conventional fossil fuel-based electricity generation has created renewed interest in grid-connected photovoltaic(PV) systems. Many studies are being performed at the power system level to examine the impacts of grid-connected PV systems and several models for PV arrays have been proposed in the literature. However, the complexity of these models and difficulties of implementing them in various software programs can be deterrents to their use. This paper proposes a robust and flexible PV device model suitable for dynamic and transient studies where the PV array's non-linear DC characteristics are important. The model's implementation in software is straightforward and it can even be constructed using standard software library components, as demonstrated using PSCAD/EMTDC.

• 전기전자학회논문지
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• 제5권2호
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• pp.121-127
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• 2001

Actual system apparatuses are necessary in order to verify the efficiency and stability of photovoltaic(PV) generation systems considering the size of solar panel, the sort of converter type, and the load conditions and so on. Moreover, it is hardly possible to compare a certain MPPT control scheme with others under the exactly same weather and load conditions as well. For the purpose of solving above mentioned difficulties in a laboratory basis, a transient simulation of PV generation system using real field weather conditions is indispensable. A straightforward simulation scheme with cost effective hardware structures under real weather conditions is proposed in this paper using EMTDC type of transient analysis simulators. Firstly, a solar cell has been modeled with VI characteristic equations, and then the real field data of weather conditions are interfaced to the EMTDC through Fortran program interface method. As a result, the stability and the efficiency analysis of PV generation systems according to various hardware structures and MPPT controls are easily possible under the exactly same weather conditions.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2006년도 추계학술대회
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• pp.561-565
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• 2006

The paper presents a method of assessing the adequate tapaclty of photovoltaic generation systems for public buildings based on analysis of load variation patterns of customers. When PV systems are installed for supplying power for the customer load, reverse power relay is required by the guideline to be installed at the point of common coupling with the power network. The suggested method analyzes daily, weekly and monthly load demand of the customer that Irishes PV system installation, and determines the appropriate rating of the PV system for preventing PV generation from exceeding the customer demand. This work is expected to support renewable energy dissemination projects of public organizations.