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domingo, 6 de outubro de 2019
Analysis of Leakage Current Elimination in Single Phase Transformerless Inverter for Grid-Tied Photovoltaic Applications Indira , Venmathi Mahendran Research Scholar, Dept of EEE, Associate Professor, Dept of EEE St.Joseph’s College of Engineering, Chennai, Tamilnadu, India
Transformerless Inverter for Grid-Tied Photovoltaic Applications Indira D1, Venmathi Mahendran2 1Research Scholar, Dept of EEE, 2Associate Professor, Dept of EEE St.Joseph’s College of Engineering, Chennai, Tamilnadu, India.
Abstract:
In photovoltaic (PV) application, it is possible to remove the transformer from the PV system in order to reduce size, losses, and cost and improve the efficiency. Due to the characteristics of low cost and high efficiency, the transformerless PV gridconnected inverters have been popularized in the application of solar electric generation system in residential market. Unfortunately, presence of the parasitic capacitor between the panel’s metal frame and cells causes the leakage current issue. The leakage current increases current harmonics injected into the utility grid, the radiated, conducted EMI, and losses. Eliminating the leakage current is one of the most important issues for transformerless single-phase photovoltaic (PV) systems. This paper focuses on analysis of leakage current elimination in single-phase transformerless inverter for PV applications. A simple unipolar Sinusoidal Pulse-Width Modulation (SPWM) technique is used to modulate the inverter to minimize the switching loss, output current ripple, and the filter requirements.The main benefits of the proposed inverter are (1) The neutral of the grid is directly connected to the negative terminal of the PV panel, so the leakage current is eliminated, (2) low cost, (3) its compact size, (4) flexible grounding configuration, (5) capability of reactive power flow, and (6) high efficiency. A complete description of the operating principle and analysis of the proposed inverter are presented and simulation results are verified.
Keywords— Charge Pump Circuit, Grid Connected Inverter, Leakage Current Elimination, Photovoltaic, Transformerless Inverter, common mode voltage, parasitic capacitor, sinusoidal pulse width modulation, SPWM.
LINK
http://oaji.net/articles/2017/1992-1537360621.pdf
sexta-feira, 4 de outubro de 2019
Designing a Solar PV System to Power a SinglePhase Distribution System Ana Guerra Vega University of Arkansas, Fayetteville
Designing a Solar PV System to Power a SinglePhase Distribution System Ana Guerra Vega University of Arkansas, Fayetteville
A thesis submitted to the Honors College in partial fulfillment of the requirements for the degree of Honors Bachelor of Science in Electrical Engineering
ABSTRACT
Over the last decade, the costs of PV system components have dropped more than 70%. Additionally, green energy incentives like the 30% tax credit have been pushed forward. PV solar systems have become accessible to the general public. Companies are pledging to reduce their carbon emissions. As part of their green initiative, the City of Fayetteville has requested a feasibility study for a PV system to be installed on the rooftop of the Facilities Management building, 115 S. Church Ave, Fayetteville, AR, 72701. This thesis shows the design process of this PV system and the return on investment estimation. While the system would not be expected to generate large revenue, for the purpose of carbon emission reduction it is feasible.
FULL TEXT VIEW
https://scholarworks.uark.edu/cgi/viewcontent.cgi?article=1068&context=eleguht
sábado, 28 de setembro de 2019
ICT&I reivindicam a continuidade dos incentivos fiscais concedidos pela Lei de Informática
LINK ORIGINAL: http://www.fpmciencia.org.br/
sexta-feira, 27 de setembro de 2019
Seminário Mecanismos de Qualidade no Setor Fotovoltaico MECANISMOS DE QUALIDADE NO SETOR FOTOVOLTAICO 10 agosto de 2018 9h00 às 17h00 Auditório do IEE/USP-BRASIL
MANHA
TARDE
Foi uma grande satisfação ter participado em este brilhante evento a qualidade dos palestrantes e o conteúdo dos temas foi excelente este tema esta vigente cada dia toda vez que o setor fotovoltaico cresce cada dia no BRASIL.
MECANISMOS DE QUALIDADE NO SETOR FOTOVOLTAICO 10 agosto de 2018 9h00 às 17h00 Auditório do IEE/USP - Av. Prof. Luciano Gualberto, 1.289 - Cidade Universitária, São Paulo
O Seminário discutiu questões estruturais que contribuem para promover a qualidade nas instalações fotovoltaicas. Ele será baseado no conceito Quality Infrastructure da Agência Internacional de Energias Renováveis (IRENA) que envolve três mecanismos, que são:
a) Normas e Regulamentação;
b) Certificação de Produtos;
c) Certificação de Pessoas
Os palestrantes convidados são renomados atores chave do Setor Fotovoltaico incluindo a participação internacional do diretor da certificadora americana NABCEP, Shawn O'Brien. O público alvo do evento foi composto por stakeholders e agentes do setor fotovoltaico como concessionárias, seguradoras, instituições financeiras, instituições de ensino, integradoras e fabricantes. PROGRAMAÇÃO
09h00 - Abertura dos Trabalhos Representantes das instituições organizadora do evento (IEE/USP, ABINEE, ABSOLAR, ABGD, ABENS, SENAI/SSCP e GIZ Mecanismos de Qualidade no Setor Fotovoltaico
09h30 - Apresentação do conceito IRENA - Infraestrutura/Mecanismos de Qualidade no Setor Fotovoltaico Roberto Zilles, IEE/USP Normas e Regulamentação
10h00 - ABNT CB-03/IEC 60364-7: Instalações elétricas de baixa tensão: Arranjos Fotovoltaicos Marcelo Pinho, IEE/USP
10h30 - Experiências das Distribuidoras com Geração Distribuída/Sistemas de Compensação Ciceli Martins Luiz, CEMIG
11h00 - Visão das Distribuidoras sobre Geração Distribuída/Sistemas de Compensação Elio Vicentini, ABRADEE
11h30 - Roda de perguntas e discussão em plenário Certificação de Produtos
14h00 - Critérios de Qualidade em Dispositivos de Proteção contra Surto (DPS) para Sistemas Fotovoltaicos Bruno Sacute, Finder
14h20 - Critérios de Qualidade em Cabos Fotovoltaicos Ivan Arca Uliana, Prysmian
14h40 - Critérios de Qualidade em Módulos Fotovoltaicos Gabriel Magdalon, Jinko Solar
15h00 - Roda de perguntas e discussão em plenário Certificação de Pessoas
15h30 - Experiências Internacionais com Certificação de Instaladores de Sistemas Fotovoltaicos Shaw O'Brien, NABCEP, Certificadora nos EUA
16h00 - Certificação de Instaladores de Sistemas Fotovoltaicos SENAI/SSCP no Brasil Fernando Gusmão, SENAI/SSCP e Enio de Oliveira, SENAI/SSCP
16h30 - Roda de perguntas e discussão em plenário.
17h00 - Encerramento
quinta-feira, 26 de setembro de 2019
DESIGN AND IMPLEMENTION OF A THREE PHASE GRID CONNECTED SIC SOLAR INVERTER A THESIS SUBMITTED TO THE GRADUATE SCHOOL OF NATURAL AND APPLIED SCIENCES OF MIDDLE EAST TECHNICAL UNIVERSITY BY MEHMET CANVER
A THESIS SUBMITTED TO THE GRADUATE SCHOOL OF NATURAL AND APPLIED SCIENCES OF MIDDLE EAST TECHNICAL UNIVERSITY BY MEHMET CANVER
ABSTRACT
DESIGN AND IMPLEMENTION OF A THREE PHASE GRID CONNECTED SIC SOLAR INVERTER
Canver, Mehmet M.S., Department of Electrical and Electronics Engineering Supervisor: Prof. Dr. Muammer Ermiş September 2018, 111 pages
In this research work a 30 kW grid connected voltage source three-phase inverter with SiC MOSFET module has been designed and implemented, in order to work with a phase-shifted full bridge (PSFB) maximum power point tracker (MPPT) converter, in such a way that these two converters compose a full system solution. The emergence of commercial SiC based power MOSFETs, which have short turnon and turn-off times, has enabled to increase switching frequency as compared to traditional Si based switching components. This circumstance was one the main motives of this thesis in the scopes of increasing the switching frequency, in order to reduce passive component volumes of inverter such as LCL filter and DC link capacitor volume, decreasing losses which leads to reduce the heat sink volume and having better efficiency. Designed and implemented inverter had been operated in the field with PSFB MPPT converter, energized by 23.75 kW total installed capacity solar arrays. Output characteristics had been investigated, and in the grid connected close loop mode various powers up to 22.32 kW had been transferred into grid. Inverter switching characteristics, drain-source voltage, unfiltered line current and zero voltage switching phenomenon were examined with the change of dead time and output line current. Total harmonic distortion had been recorded at various output powers, and a minimum THD value of 3.84% had been obtained at maximum output power of 22.32 kW. Experimental efficiency values was calculated from various recorded input and output powers. 98.55% peak efficiency at half of rated output power and 98% efficiency at peak output power had been obtained.
Keywords: Three-Phase Grid Connected Inverter, Silicon Carbide, Voltage Source Inverter (VSI), Photovoltaic
LINK:http://etd.lib.metu.edu.tr/upload/12622696/index.pdf
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