• 전기화학회지
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• 제20권1호
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• pp.18-25
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• 2017

본 총설에서는 최근 전세계적으로 각광 받고 있는 유기 금속 할라이드 페로브스카이트 소재에 기반한 태양광 물분해 연구에 대해 정리하였다. 크게, 현재까지 연구보고들을 태양전지-전기분해기 구성 (photovoltaic-electrolyzer configuration) 및 통합 태양광 물분해 (integrated photoelectrolysis)로 분류하여 최근 연구결과들을 소개하였다. 해당 분야 연구는 아직 초기 단계에 있으며, 향후 효과적인 보호막 개발, 고전압 텐덤전지 제작 등이 필요함을 보였다.

• Current Photovoltaic Research
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• 제10권1호
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• pp.23-27
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• 2022

In this study, we investigate organic-inorganic halide perovskite solar cells with a vacuum thermal evaporated hole transporting layer (NPB/MoO_3-x). By replacing solution process based Spiro-MeOTAD with vacuum thermal evaporation based NPB/MoO_3-x, a thin hole transporting layer was implemented. In addition, parasitic absorption that may occur during the doping process was eliminated by excluding solution process doping. In a solar cell with a thin vacuum thermal evaporated hole transporting layer, the short-circuit current density (Jsc) increased to 23.93 mA/cm², resulting in the highest power converstion efficiency (PCE) at 18.76%. Considering these results, it is essential to control the thickness of hole transporting layer located at the top in solar cell configuration.

• Current Photovoltaic Research
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• 제11권4호
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• pp.118-123
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• 2023

The main cause of solar facility fires is arc, and in the last 3 years ('16 to '18), about 80% of domestic solar facility fires have been caused by arcs. The capacity of solar power facilities installed around the world continues to increase, and fires caused by arcs are also expected to increase as the solar power generation facilities that were initially installed become obsolete, In this paper, an arc generation test was conducted based on the UL1699B test standard. As a result of the test, the arc generation satisfied the minimum arc current according to the test conditions, and DC arc characteristics were analyzed through data such as arc voltage and arc current according to variables such as speed of moving electrodes and electrode spacing.

• 한국전기전자재료학회논문지
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• 제24권1호
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• pp.70-75
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• 2011

We introduced nanoscale interfacial layers between the PV layer and the cathode in poly (3-hexylthiophene):methanofullerene bulk-heterojunction polymer photovoltaic (PV) cells. The nanoscale double interfacial layers were made of ultrathin poly (oxyethylenetridecylether) surfactant and low-work-function alloy-metal of Al:Li layers. It was found that the nanoscale interfacial layers increase the photovoltaic performance, i.e., increasing short-circuit current density and fill factor with improved device stability. For PV cells with the nanoscale double interfacial layers, an increase in power conversion efficiency of $4.18{\pm}0.24%$ was achieved, compared to that of the control devices ($3.89{\pm}0.08%$) without the double interfacial layers.

• 태양에너지
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• 제18권1호
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• pp.27-34
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• 1998

태양광 발전 시스템의 운용에 있어서 부하의 변동, 일사량, 주변온도등에 의한 최대전력점의 추종은 매우 어려운 기술을 요구한다. 본 연구에서는 이러한 최대전력점의 추종에 있어 빠른 수렴 특성을 얻기 위한 알고리즘으로써 신경 제어기법을 이용하여서 기존의 제어 방식에 의한 동특성과 비교하여 적절한 제어기법 및 시스템동작의 우수한 특성을 얻게 되었다. 즉 최대전력점의 추종 및 안정한 전원의 공급을 갖게되었다.

• 태양에너지
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• 제18권1호
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• pp.19-25
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• 1998

This paper describes a design method and characteristics analysis of the 3 kW grid-connected photovoltaic power generation system to establish the basic application technology of photovoltaic systems. The design specification of a 3 kW photovoltaic power generation system including a DC/AC inverter is suggested to investigate the system performance for grid connection. The results of the demonstration test from February to October show that the system with utilization rate up to 17% has reliable operation characteristics and is useful for peak-shaving of utility power.

• International Journal of Computer Science & Network Security
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• 제24권4호
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• pp.87-106
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• 2024

Vehicle-to-Home (V2H) and Home Centralized Photovoltaic (HCPV) systems can address various energy storage issues and enhance demand response programs. Renewable energy, such as solar energy and wind turbines, address the energy gap. However, no energy management system is currently available to regulate the uncertainty of renewable energy sources, electric vehicles, and appliance consumption within a smart microgrid. Therefore, this study investigated the impact of solar photovoltaic (PV) panels, electric vehicles, and Micro-Grid (MG) storage on maximum solar radiation hours. Several Deep Learning (DL) algorithms were applied to account for the uncertainty. Moreover, a Reinforcement Learning HCPV (RL-HCPV) algorithm was created for efficient real-time energy scheduling decisions. The proposed algorithm managed the energy demand between PV solar energy generation and vehicle energy storage. RL-HCPV was modeled according to several constraints to meet household electricity demands in sunny and cloudy weather. Simulations demonstrated how the proposed RL-HCPV system could efficiently handle the demand response and how V2H can help to smooth the appliance load profile and reduce power consumption costs with sustainable power generation. The results demonstrated the advantages of utilizing RL and V2H as potential storage technology for smart buildings.

• 한국컴퓨터정보학회논문지
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• 제18권9호
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• pp.33-41
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• 2013

본 논문에서는 CdS(황화 카드뮴) 광센서란 소자를 태양광 모듈로 대체하여, 신재생에너지를 통한 충전도 하며 이 전력으로 동작하는 태양광 스위치를 제안하고 이의 효용성을 실험/검증하고자 한다. 우선 기존의 CdS 광센서와 이를 포함한 자동 점멸 스위치의 동작 원리를 조사해 본 후, 태양광 모듈의 특성을 조사함으로써 기존의 광센서를 태양광 모듈로 대체가능할 지를 분석해 본다. 그 가능성을 확인해 본 후, 태양광 스위치 회로를 설계 및 구현한 후, 이의 특성을 실험해 봄으로써 기존 스위치를 대체 가능함을 보이고 그 특성들을 비교/평가해 본다. 연구 결과 제안하는 태양광 스위치가 기존의 자동 점멸 스위치를 대체 가능함을 확인하였을 뿐만 아니라, 보다 많은 장점들을 가지고 있음을 확인하였다.

• Transactions on Electrical and Electronic Materials
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• 제18권2호
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• pp.103-110
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• 2017

The number of applications of solar photovoltaic (PV) systems in power generation grids has increased in the last decade because of their ability to generate efficient and reliable power in a variety of low installation in domestic applications. Various PV converter topologies have therefore emerged, among which the modular multilevel converter (MMC) is very attractive due to its modularity and transformerless features. The modeling and control of the MMC has become an interesting issue due to the extremely large expansion of PV power plants at the residential scale and due to the power quality requirement of this application. This paper proposes a novel control method of MMC which is used to directly integrate the photovoltaic arrays with the power grid. Traditionally, a closed loop control has been used, although circulating current control and capacitors voltage balancing in each individual leg have remained unsolved problem. In this paper, the integration of model predictive control (MPC) and traditional closed loop control is proposed to control the MMC structure in a PV grid tied mode. Simulation results demonstrate the efficiency and effectiveness of the proposed control model.

• 신재생에너지
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• 제19권4호
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• pp.84-97
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• 2023

This study aimed to investigate the feasibility and potential applications of utilizing bifacial photovoltaic (PV) panels from an architectural perspective. It also aimed to establish a foundational dataset for installation and operational guidelines for bifacial PV panels through a comparative analysis of energy production performance with single PV panels. The research encompassed several key steps, including a comprehensive literature review, calculation of solar surface radiation values, development of datasets for bifacial and single PV energy production, and a performance comparison between both approaches. The results of the study show that bifacial PV panels exhibit optimized energy production capabilities within the range of 40 to 80 degrees, contingent upon the specific installation location. Consequently, it is recommended that the installation of bifacial PV panels in Korea should primarily focus on southwest-to-west orientation. Furthermore, it was concluded that bifacial PV panels could contribute an equivalent or even superior level of energy production compared to single PV panels, even if their performance exhibited a marginally lower efficiency of 2% to 5% with an 18% power generation efficiency.