• 한국인터넷방송통신학회논문지
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• 제23권2호
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• pp.149-155
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• 2023

태양광 발전은 신재생에너지 중 가장 친숙한 발전시설로 약 10여 년 전부터 보급이 확대되기 시작해 현재 시점에서는 시스템의 유지보수관리에 대한 해결 및 기술에 관한 관심이 높아지고 있다. 특히 태양광 발전시스템의 이상 유무 및 부품 교체시기 그리고 시스템의 종합효율을 최대화할 수 있는 대책이 필요하다. 태양광발전시스템의 한 요소인 PV 인버터는 전력용 스위칭 소자에 의존하는 전력변환 시스템으로 DC/DC 컨버터 및 DC-AC 인버터 구성에 따른 직류(DC-Link) 커패시터가 사용된다. 이러한 직류 커패시터 역시 장시간 사용에 따른 노후 및 열화로 인해 PV 인버터의 발전량 감소와 전력손실 그리고 고조파(THD, 교류출력전류 종합왜형률) 증가로 신재생에너지 설비를 통한 계통 안전성(Safety)에 영향을 미치는 요인으로 분석할 수 있다. 따라서 본 논문에서는 태양광발전시스템에서 현재 운영 중인 직류 커패시터 용량 상태에 따른 PV 인버터 동작 특성을 고찰함과 동시에 신재생에너지 설비의 안전성 및 신뢰성을 확보할 수 있도록 연구내용을 제안하였다.

• 한국태양에너지학회 논문집
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• 제39권3호
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• pp.29-45
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• 2019

As the solar energy market grows, the need to investigate the potential of photovoltaic system is being highlighted. However, due to the lack of plain field, the system on top of buildings is being exploited. This paper analyzes the potential to install PV systems on the rooftops. First of all, with the aid of a photovoltaic system simulation software, buildings were designed in a specific area based on the architectural data. And then, with the same software, the potential to install photovoltaic system was explored by placing PV modules on the buildings' rooftops. The installation potential was calculated and simulated with consideration for obstacles on the rooftops. The parameters are composed of available area for system installation, area utilization rate, PV system power capacity, operation yield hour per day and performance ratio. In the simulation, 5 sites were analyzed based on their architectural data. In the end, reliable data that can be utilized were collected for the potential to install the system with the photovoltaic system simulation software.

• KIEAE Journal
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• 제15권1호
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• pp.89-95
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• 2015

The centralized power supply system and rainwater treatment system, which are major infrastructure in modern cities, are showing their limitations in accommodating environment load due to climate changes that has aggravated recently. As a result, complex issues such as shortage of reserve power and urban flooding have emerged. As a single solution, decentralized systems such as a model integrating photovoltaic system and rooftop greening system are suggested. When these two systems are integrated and applied together, the synergy effect is expected as the rooftop greening has an effect of preventing urban flooding by controlling peak outflow and also reduces ambient temperature and thus the surface temperature of solar cells is lowered and power generation efficiency is improved. This study aims to compare and analyze the monitoring results of four algorithms that define correlations between micro-climate variables around rooftop greening and the surface temperature of solar cells and generate their significance. By doing so, this study seeks to present an effective algorithm that can estimate the surface temperature of solar cell that has direct impact on the efficiency of photovoltaic power generation by observing climate variables.

• 한국생산제조학회지
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• 제22권4호
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• pp.629-634
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• 2013

This study aims to investigate a new structure for a concentrating photovoltaic (PV) module using a III-V compound semiconductor solar cellto solve the problems of existing concentrating PV modules and to explore a concentrating optical system with a flat structure, which shows remarkable advantages in terms of manufacturing cost, installation, and maintenance. This study should greatly contribute toward the development of concentrating PV modules. This study was performed to achieve an improvement in efficiency and economy and to implement an actual product. A new source of renewable energy is the only way in which countries that cannot produce oil can even emerge as an energy power. Therefore, this work can serve as a fundamental study that will help South Korea grow into a country that is a PV power generation force.

• 조명전기설비학회논문지
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• 제28권5호
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• pp.31-38
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• 2014

Maximum power point tracking method is very important to enhance efficiency of photovoltaic system. Meanwhile a lot of research about MPPT has been studied and developed new one better than a method of the past. This paper deals with Perturb and Observation that are most commonly used. Tracking parameter changed PV voltage for PV current and it was simulated with P-SIM program. The P&O tracking method to use current for parameter lows ripple rate of output and enhances response rate of tracking. Through this study, it has been demonstrated that method using current for tracking parameter is effective.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1997년도 하계학술대회 논문집 F
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• pp.1945-1947
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• 1997

In this paper, a characteristics analysis of the grid-connected photovoltaic power generation system which uses the simulation method of PV array is reported. The control method of DC/AC power conversion were suggested to establish the basic application technology of photovoltaic systems. The results of the demonstration test of a 3kW grid-connected PV system show that the system utilization rate is 17.6% and the system efficiency is 8.9%.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2005년도 전력전자학술대회 논문집
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• pp.734-736
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• 2005

This paper presents experimental operation with utility invertactive 3kW photovoltaic generation system. And that describe configuration of utility interactive photovoltaic system which power supply for Demonstration experiment. The status of photovoltaic generation system comp-onents and interconnection and safety equipment will be summarized. This paper discusses property operation state which system endure division of power for demonstration experiment.

• 전기학회논문지
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• 제63권5호
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• pp.644-651
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• 2014

The renewable energy system and the real-time pricing can provide the significant economic advantage for end-user of residential house. However, according to recent studies, high initial cost of renewable energy system such as photovoltaic (PV) system and lack of suitable load control methods adjusting electric power consumption in response to time-varying price are regarded as the major obstruction for introduction of renewable energy system and real-time pricing in residental household. In this paper, we propose automated optimal load control strategy which aim to achieve not only minimizing the electricity cost but also the increase in the utilization rates of PV generation power of residential PV house in real-time pricing environment. Simulation results show that our proposed optimal load control strategy leads to significant reduction in the electricity costs and increase in the utilization rates of power generated by PV system in comparison with the conventional PV house. Therefore, the proposed optimal load control strategy can provide more economic benefit to end-user.

• 전력전자학회논문지
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• 제25권6호
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• pp.425-432
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• 2020

The phase-shifted, full-bridge (PSFB) DC-DC converter is widely used in electric vehicles (EVs) to charge a low-voltage (12 V) battery from a high-voltage battery. A Photovoltaic (PV) module-integrated PSFB converter is proposed for the EV power conversion system. The converter is useful because solar energy can be utilized to extend the driving range. The buck converter circuit is simply realized by adding one switch to the conventional PSFB converter's secondary side. For the inductor and diode, the existing components in the PSFB converter are shared. The proposed converter can charge a low-voltage battery from the PV module with maximum power point tracking. In addition, the two power sources can be used simultaneously, and efficiency is increased by reducing the circulating current, which is a problem for the conventional PSFB converter.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2003년도 춘계전력전자학술대회 논문집(2)
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• pp.687-691
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• 2003

In photovoltaic generation, PV module is used to generate the electricity, and this system has been in limelight as nonpolluting alternative energy source. But, as energy density is low and PV module cost is high, there is a disadvantage that initial investment cost go up. In this study, we studied the method of allowing a tracker, adequate to photovoltaic generation, for Increasing the generating. We determined the proper error angle in order to decrease the repeating number of tracking without a reduction of the generating by using our developed simulator. And, we presented the photovoltaic approach tracking control and achieved its experiment. Through the result of experiment, it is expected that the fault rate and the consumption of electric power in a tracker get reduced and its cost become cut down.