• Title/Summary/Keyword: A photovoltaic system

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A Study on SSDP protocol based IoT / IoL Device Discovery Algorithm for Energy Harvesting Interworking Smart Home

  • Lee, Jonghyeok;Han, Jungdo;Cha, Jaesang
    • International Journal of Internet, Broadcasting and Communication
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    • v.10 no.2
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    • pp.7-12
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    • 2018
  • The spread of IoT (Internet of Things) technology that connects objects based on wired / wireless networks is accelerating, and IoT-based smart home technology that constitutes a super connected network connecting sensors and home appliances existing inside and outside the home is getting popular. In addition, demand for alternative energy technologies such as photovoltaic power generation is rapidly increasing due to rapid increase of consumption of energy resources. Recently, small solar power systems for general households as well as large solar power systems for installation in large buildings are being introduced, but they are effectively implemented due to limitations of small solar panels and lack of power management technology. In this paper, we have studied smart home structure and IoT / IoL device discovery algorithm for energy harvesting system based on photovoltaic power generation, It is possible to construct an efficient smart home system for device control.

Study on the Islanding Detection Technique of the Grid-Connected Photovoltaic System using Grid Voltage Harmonic Coefficients (계통전원 하모닉을 이용한 태양광 발전 시스템의 단독운전 검출기법에 관한 연구)

  • Kim, Il-Song
    • The Transactions of the Korean Institute of Power Electronics
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    • v.15 no.6
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    • pp.417-424
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    • 2010
  • This paper proposes a new islanding detection method for a grid-connected photovoltaic system. It is based on the fact that the equivalent harmonic components vary according to the grid connection status. The advantage of the proposed method is the reduced Non-Detection Zone and fast detection time. Also it can have the robust detection capability against grid disturbances. The theoretic analysis using grid-harmonic modeling is performed and verified by test result using 32-bit high performance DSP processor.

Performance Improvement Justification of a Concentrating Photovoltaic(CPV) System over a non-concentrating PV system (비집광형 PV시스템 대비 집광형 PV시스템의 성능 개선 효과 분석)

  • Naveed, Ahmed T;Kang, Eun-Chul;Lee, Eui-Joon
    • Journal of the Korean Solar Energy Society
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    • v.25 no.4
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    • pp.141-153
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    • 2005
  • PV 태양광 발전은 PV 재료가 고가이므로 일반 전력비용에 비해 상대적으로 비용이 높아진다. 저가형 광학 집광기술과 PV를 통합하게 되면, 비용뿐만 아니라 설치면적 등에서 유리하게 되나, 집광기의 단점이 함께 추가되게 된다. 집광기는 작은 수광각과 송신광선을 갖고 있어 PV 모듈에 필요한 태양광, 광학손실의 손실정도를 최소화하기 위한 신중한 시스템 디자인과 2축형 트레킹 장치가 필요하다. 고정식 비집광 시스템보다 더 많은 에너지를 얻기 위해서는 광학시스템의 손실율을 줄이고, 고효율의 PV 모듈을 이용한 PV셀의 상호연결이 필요하다. 본 논문에서는 우선, 비이미지 프레넬 렌즈 집광기를 사용한 PV 시스템에 대하여 간단하게 설명한 후, 출력전력값을 이론적으로 예측하고 PV 효율과 시스템 성능을 제시하였다. 프레넬 렌즈 선형 집광기 통합 PV 시스템과 비집광 PV 모듈의 출력전력값과 시스템 비용을 비교하면, PV 전력비용을 줄일 수 있는 집광기의 이용이 유용한 것을 알 수 있다. 따라서, 집광형 PV 시스템은 미래의 에너지 이용에 매우 유리한 시스템이라 할 수 있다.

옥외 태양광 발전 시스템의 Potential Induced Degradation 진단 및 야간 역전압 회복 연구

  • Choe, Hun-Ju;Kim, Gwang-Hyeon;Jang, Dong-Sik;Bae, Su-Hyeon;Park, No-Chang;O, Won-Uk
    • Bulletin of the Korea Photovoltaic Society
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    • v.3 no.2
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    • pp.42-47
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    • 2017
  • The potential induced degradation (PID) phenomenon shows severe power loss within several years from the initial installation of solar power system. The accumulated power loss by PID is inevitable because the PID is suspected only if the power loss exceeds several percent. In this paper, we analyzed the cases of PID diagnosis and recovery by visiting the suspected PID site about 17 months after the installation of the 100kW PV system. The power difference of the two 50kW inverters was more than 20kWh, and the PR difference was more than 8%. From the beginning of the installation, the difference in power gradually increased. The recovery was observed for about 7 months by applying 1000V in the reverse bias at night. As a result, the power difference of the two inverters was recovered to within 2kWh. In the case of a power station suffering from PID in the field, it will be helpful for stable development operation by quick diagnosis and problem solving.

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Modelling and Simulation of PV System (태양광 시스템의 모델링과 시뮬레이션)

  • Song, Ho-Bin;Cho, Moon-Taek;Hwang, Lak-Hoon;Seo, Yong-Soo;Han, Kyung-Hee;Kim, Eun-Gi;Kim, Young-Chun;Lee, Chung-Sik
    • Proceedings of the KIEE Conference
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    • 2005.07b
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    • pp.1739-1741
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    • 2005
  • Many photovoltaic(PV) systems are being developed and installed. For a PV developer, simulations are required before the experimental testing. However, most simulation tools do not offer data libraries for PV systems, so that some Institutes who try to use such software will be in difficulty. In this paper, simulations of performance and stability have been carried out using the software PSPICE. In this paper, the modelling of solar cell arrays, photovoltaic modules, PV generators, batteries and drive systems is carried out based on mathematical equivalence circuits and available data, and the models are converted into a data library for PSPICE that is user friendly. System variations can be modeled by simple parameter variation. To verify the accuracy of the simulation library, various models were run and compared to known systems.

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Switching Digital Fuzzy Controller for Hybrid Generation System Using Wind and Photovoltaic Energy (풍력과 태양 에너지를 이용한 하이브리드 발전시스템 구현을 위한 스위칭 디지털 퍼지 제어기 개발)

  • Sung, Hwa-Chang;Joo, Young-Hoon;Park, Jin-Bae
    • Journal of the Korean Institute of Intelligent Systems
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    • v.16 no.6
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    • pp.753-758
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    • 2006
  • We present the development of the digital fuzzy controller for maximum power regulation. A hybrid system that comprises wind and photovoltaic generation subsystems, and battery bank is developed in this paper. We use Takaki-Sugeno (T-S) fuzzy model to deal with the power regulation problem, since each power generator has complex nonlinear terms. The problem for regulation control can be simplified into a stabilization one. Also, in order to utilize the advanced digital device, we perform the intelligent digital redesign method. Finally, the performance of the proposed controller is extensively assessed through computer simulation.

Suggestion of a Hybrid Method for Estimating Photovoltaic Power Generation (전력 IT 시스템에서 복합방식의 태양광 발전량 예측 방법 제안)

  • Ju, Woo-Sun;Jang, Min-Seok;Lee, Yon-Sik;Bae, Seok-Chan;Kim, Weon-Goo
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2011.10a
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    • pp.782-785
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    • 2011
  • Needs for MG(Microgrid) development are increasing all over the world as a solution to the problems including the depletion problem of energy resources, the growing demand for electric power and the climatic and environmental change. Especially Photovoltaic power is one of the most general renewable energy resources. However there is a problem of the uniformity of power quality because the power generated from solar light is very sensitive to climate fluctuation (variation of insolation and duration of sunshine, etc). As a solution to the above problem, ESS(Energy Storage System) is considered generally, but it has some limitations. To solve this problem this paper suggests a hybrid estimation method of photovoltaic power generation according to two climatic factors, i.e. insolation and sunshine. This result seems to help design the appropriate capacity of ESS and estimate the proper switching time between DC and AC power in the premises power system and thus maintain the uniformity of power quality.

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The Arch Type PV System Performance Evaluation of Multi Controlled Inverter for Improve the Efficiency (효율개선을 위한 다중제어 인버터방식의 아치형 PV System 성능 분석)

  • Lee, Mi-Yong;Park, Jeong-Min
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.13 no.11
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    • pp.5452-5457
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    • 2012
  • It is saving material cost and construction cost by replacing conventional building materials, and It has advantages for aesthetic value. In the Europe, the United States, Japan and other country research about BIPV is actively being carried out and marketability is also being infinity expanding. Arch type PV systems efficiency characteristics is different depending on PV array's directly connection, parallel connection and arches angle, but is a lack of analysis on this nowadays. When the arch type PV system design up, they consider about aesthetic value and they didn't consider about generation efficiency. In this paper, we try to improve the efficiency through optimization of arch type PV system and estimation of the efficiency parameters of the arch type PV system, such as latitude, longitude, temperature, insolation, arch angle and each kind loss from system organization. For improving Arched PV system efficiency, proposed multiple control inverter system, and using simulation tool of Arched PV system "Solar pro", flat-plate type and many arch type PV system configuration the driving characteristics were compared and analyzed.

The bidirectional DC module type PCS design for the System Inter Connection PV-ESS of Secure to Expandability (계통 연계 PV-ESS 확장성 확보를 위한 병렬 DC-모듈형 PCS 설계)

  • Hwang, Lark-Hoon;Na, Seung-Kwon;Choi, Byung-Sang
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.14 no.1
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    • pp.56-69
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    • 2021
  • In this paper, the PV system with a link to the commercial system needs some advantages like small capacity, high power factor, high reliability, low harmonic output, maximum power operation of solar cell, and low cost, etc. as well as the properties of inverter. To transfer the PV energy of photovoltaic power generation system to the system and load, it requires PCS in both directions. The purpose of this paper is to confirm the stable power supply through the load leveling by presenting the PCS considering ESS of photovoltaic power generation. In order to achieve these purpose, 5 step process of operation mode algorithm were used according to the solar insolation amount and load capacity and the controller for charging/ discharging control was designed. For bidirectional and effective energy transfer, the bidirectional converter and battery at DC-link stage were connected and the DC-link voltage and inverter output voltage through the interactive inverter were controlled. In order to prove the validity of the suggested system, the simulation using PSIM was performed and were reviewed for its validity and stability. The 3[kW] PCS was manufactured and its test was conducted in order to check this situation. In addition, the system characteristics suggested through the test results was verified and the PCS system presented in this study was excellent and stronger than that of before system.

Combined Control Algorithm for a DC-DC Converter of PV & Battery for Mongolian Nomadic Life (유목민들을 위한 PV & Battery용 DC-DC 컨버터의 통합제어 알고리즘)

  • Tuvdensuren, Oyunjargal;Le, Tat-Thang;Park, Min-Won;Yu, In-Keun
    • Journal of Korea Society of Industrial Information Systems
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    • v.23 no.1
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    • pp.23-29
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    • 2018
  • A stand-alone Photovoltaic (PV) system is one of the most important energy system for Mongolian nomadic herders. Basically, a stand-alone PV system uses two DC-DC converters. This makes the system costly, size bigger and difficult to move from one place to another place for the nomadic herders. A combined control algorithm for charging the battery using Stage of Charge (SOC) and Maximum Power Point Tracking (MPPT) is proposed in this paper. The batteries are charged by the three stage method; bulk, absorption and float charge. In the bulk stage used the MPPT function in this study. The performance of the proposed control algorithm is evaluated in both steady and changing weather conditions. The results are obtained using PSIM software. The results obtained in this paper are useful in designing a stand-alone PV system in the rural life like Mongolian nomadic herders.