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sábado, 21 de outubro de 2017
Analysis and Design of Single-Phase Photovoltaic Grid-Connected Inverter - Jaehwe Shim Department of Embedded SW Graduate School, Kwangwoon University Seoul, Korea
Analysis and Design of Single-Phase Photovoltaic Grid-Connected Inverter
Jaehwe Shim Department of Embedded SW
Graduate School, Kwangwoon University Seoul, Korea
Abstract
This paper proposed a new maximum power point tracking(MPPT) algorithm to find true maximum power point(MPP) for mismatched PV(Photovoltaic) modules. And also, various anti-islanding algorithms for grid-connected PV system were analyzed comparatively. At first, in order to have PV PCS maximum power generation efficiency, maximum power point trackers are used to operate a solar PV panel at its MPP. A number of MPPT algorithms has been used in the past such as P&O, IncCond, etc. But these algorithm cannot track true maximum power point under mismatched PV modules caused by clouds, shadow, and snow. The multiple local maxima can be existed on PV characteristic curve under mismatched PV modules. Therefore, the proposed MPPT algorithm, which is capable of tracking the true MPP under mismatched PV, is verified by simulation and experiment. In addition, this paper covered various anti-islanding methods for distributed grid-connected PV PCS. The islanding is that the phenomenon wherein the distributed PV PCS does not detect the interruption due to the power failures and faults, but dose continue operation. Islanding phenomenon can cause to have maintenance engineer in danger and to have application load damaged. Therefore grid-connected PV PCS must be disconnected while detecting the islanding phenomenon within the specified time, which secures safety and reliability. In this paper past various anti-islanding algorithms were explained and verified validity comparatively. For the validity of the proposed MPPT algorithm, 3kW PV system was designed with connected PV simulator.
LINK
http://www.mediafire.com/file/zxhzxcphv8p7la1/Analysis_and_Design_of_Single_Phase_Photovoltaic_Grid_Connected_Inverter.pdf
Power Conversion Technology for Grid-connected PV inverter-Woo-Jun Cha (차 우 준) Department of Electrical Engineering Pohang University of Science and Technology
Power Conversion Technology for Grid-connected PV inverter
Woo-Jun Cha (차 우 준)
Department of Electrical Engineering
Pohang University of Science and Technology 2015
ABSTRACT
This thesis proposes hardware circuits and control algorithm of grid-connected photovoltaic (PV) inverters having high efficiency. PV inverter can be classified into singlephase and three-phase inverter according to power capacity. A micro-inverter system is proposed for the single-phase inverter. This system is composed of step-up dc-dc converter that uses an active-clamp circuit with a series-resonant voltage doubler and a high efficiency inverter with single-switch-modulation. During the step-up dc-dc stage, the active-clamp circuit provides zero-voltage switching turn-on, recycles the energy stored in the leakage inductance of the transformer, and limits switch voltage stress. A series-resonant voltage doubler is used on the transformer secondary side to remove the reverse-recovery problem of the rectifier diodes. During the inverter stage, to improve efficiency and reliability in the proposed inverter, only single switch is modulated at switching frequency without shoot-through problem. This whole process minimizes power losses and eliminates a mismatch of a capacity between the PV panel and PV inverter, so the proposed micro-inverter is suitable for use in a single-phase grid connected PV inverter. A prototype design and experimental results are given to verify the proposed system. A novel space-vector modulation (SVM) for a three-phase PV inverter with simple software implementation is proposed. The conventional SVM algorithm for the three-phase PV inverter requires complex computations, such as square root and arctangent, and a sector selection algorithm. The proposed SVM algorithm can determine directly on-state times of switches without complex computations and complex sector selection algorithm. Experimental results show high performance of the proposed algorithm for the three-phase PV inverter.
LINK
http://www.mediafire.com/file/u6wnmz2xww2x80f/POWER_CONVERSION_TECHNOLOGY_FOR_CONNECTED_PV_INVERTER.pdf
quinta-feira, 12 de outubro de 2017
SEPOC 2017 10Th SEMINAR ON POWER ELECTRONICS AND CONTROL SANTA MARIA ,RS,BRAZIL * 22- 25 OCTOBER
SEPOC 2017
SEPOC 2017 is the 10th edition of the Seminar on Power Electronics and Control and this year the conference will be held with the IEEE seal. The meeting will take place at the Technology Center of the Federal University of Santa Maria and is organized by the IEEE Chapters and Student Branch.
The seminar’s objective is to provide interaction among academia and industry to discuss the latest cutting-edge technologies on Power Electronics and Control and their applications. In 2017, the conference is themed on distributed power generation.
Track 1: Energy Processing in Power Systems
Converter topologies/control for energy processing and/or grid connection
Modeling and energy conversion of sustainable sources
Energetic efficiency and load management
Energy storage systems modeling and control
Electric machines control and drives
Track 2: Distributed Generation Quality and Operation
Power systems modeling, operation, and control
Grid protection and energy quality
Distributed energy planning and expansion
Track 3: Smart Systems for Smart Grids
Topologies and control for smart illumination systems
Efficiency, technologies, and reliability of electronics equipment
Management and control of communication networks
INFORMAÇÃO COMPLETA SOBRE O SEPOC 2017 NO SEGUINTE WEBSITE:
http://coral.ufsm.br/sepoc/sepoc2017/
Rap Session 1: Regulamentação de inversores fotovoltaicos: Demandas, desafios e oportunidades
Panelists:
Chair: Lucas Vizzotto Bellinaso - UFSM
Leandro Michels - UFSM
Denizar da Cruz Martins - UFSC
Marcelo Pinho Almeida - USP
domingo, 8 de outubro de 2017
QUALIDADE DE ENERGIA Eng. Msc Jonathan Dômini Sperb, Prof.Dr. Eng.Marcello Mezaroba DISCIPLINA CONDICIONADORES DE ENERGIA UNIVERSIDADE DO ESTADO DE SANTA CATARINA UDESC BRASIL
QUALIDADE DE ENERGIA Jonathan Dômini Sperb, Eng. Msc. Prof. Marcello Mezaroba
DISCIPLINA CONDICIONADORES DE ENERGIA
JOINVILLE-CENTRO DE CIÊNCIAS TECNOLÓGICAS
UNIVERSIDADE DO ESTADO DE SANTA CATARINA UDESC BRASIL
Qualidade de Energia:
Aumento da utilização do termo Qualidade de Energia
–Pela concessionária (geração, transmissão e distribuição)
–Pelos consumidores (indústrias)
LINK ORIGINAL DO ARTIGO:
http://www.joinville.udesc.br/portal/professores/mezaroba/materiais/CEN___Aula_01___Qualidade_de_Energia.pdf
Assinar:
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