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Title: Highly Reliable Multi-Port Smart Inverter Modules for PV-Based Energy Systems: Preprint

Abstract

Generally large electrolytic capacitors (e-caps) are required to decouple the double line frequency power fluctuation inherent in all the single-phase dc-ac or ac-dc converters. These e-caps pose the weak-link in the PV inverter as they have poor reliability due to short life expectancy and higher ESR leading to lower system efficiency. In this paper, the multi-port smart dual inverter modules are proposed for PV string inverter systems which eliminate the requirement of large decoupling capacitors, thus leading to more reliable and highly efficient inverter modules. The balanced dual outputs are controlled in phase quadrature such that the double frequency current is completely eliminated. One of the phases supports the stand-alone residential loads and the other phase interfaces to the grid, which is synchronized to the utility grid. Also the proposed modular configuration is scalable to accommodate higher power rating by stacking and paralleling multiple modules. Simulation results for the dual inverter modules rated for 1 kW each are presented to validate the proposed concept, the hardware-in-the-loop based experimental platform is developed and the results will be presented in the final version of the paper.

Authors:
 [1];  [1];  [1]
  1. National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S)
OSTI Identifier:
1532644
Report Number(s):
NREL/CP-5D00-73857
DOE Contract Number:  
AC36-08GO28308
Resource Type:
Conference
Resource Relation:
Conference: Presented at the 46th IEEE Photovoltaic Specialists Conference (PVSC 46), 16-21 June 2019, Chicago, Illinois
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; film capacitor; highly reliable; minimized decoupling capacitor; multi-port residential PV inverter system; quadrature phase control; single-phase dual-inverter modules

Citation Formats

Roy, Jinia, Seo, Gabsu, and Singh, Akanksha. Highly Reliable Multi-Port Smart Inverter Modules for PV-Based Energy Systems: Preprint. United States: N. p., 2019. Web.
Roy, Jinia, Seo, Gabsu, & Singh, Akanksha. Highly Reliable Multi-Port Smart Inverter Modules for PV-Based Energy Systems: Preprint. United States.
Roy, Jinia, Seo, Gabsu, and Singh, Akanksha. Wed . "Highly Reliable Multi-Port Smart Inverter Modules for PV-Based Energy Systems: Preprint". United States. https://www.osti.gov/servlets/purl/1532644.
@article{osti_1532644,
title = {Highly Reliable Multi-Port Smart Inverter Modules for PV-Based Energy Systems: Preprint},
author = {Roy, Jinia and Seo, Gabsu and Singh, Akanksha},
abstractNote = {Generally large electrolytic capacitors (e-caps) are required to decouple the double line frequency power fluctuation inherent in all the single-phase dc-ac or ac-dc converters. These e-caps pose the weak-link in the PV inverter as they have poor reliability due to short life expectancy and higher ESR leading to lower system efficiency. In this paper, the multi-port smart dual inverter modules are proposed for PV string inverter systems which eliminate the requirement of large decoupling capacitors, thus leading to more reliable and highly efficient inverter modules. The balanced dual outputs are controlled in phase quadrature such that the double frequency current is completely eliminated. One of the phases supports the stand-alone residential loads and the other phase interfaces to the grid, which is synchronized to the utility grid. Also the proposed modular configuration is scalable to accommodate higher power rating by stacking and paralleling multiple modules. Simulation results for the dual inverter modules rated for 1 kW each are presented to validate the proposed concept, the hardware-in-the-loop based experimental platform is developed and the results will be presented in the final version of the paper.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {7}
}

Conference:
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