Transformerless DC/AC Converter For Grid-Connected PV Power Generation System

Azri, Maaspaliza and Abdul Rahim, Nasruddin and Mohamad Elias, Mohamad Fathi (2014) Transformerless DC/AC Converter For Grid-Connected PV Power Generation System. Arabian Journal for Science and Engineering, 39. pp. 7945-7956. ISSN 1319-8025

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Transformerless photovoltaic (PV) systems have two shortcomings:low voltage not fulfilling load requirement and ground-leakage current flowing through parasitic capacitance between the PV panel and ground.Therefore,a DC/AC converter—a single-phase bipolar sinusoidal pulse width modulation (SPWM) H-Bridge power inverter configuration with a DC/DC high-gain conversion-boosting (CDBoost)stage—is proposed.Its conversion ratio was compared with a conventional converter’s.It provides a high conversion ratio of the PV voltage before the DC is converted into AC for the load.The bipolar SPWM modulation technique is proposed for lower ground-leakage current,and the effectiveness of the proposed modulation technique was compared with the unipolar SPWM technique.The effect of unbalanced filter inductance and of parasitic capacitance on the combined CD-Boost bipolar SPWM H-Bridge converter system was investigated. Simulation and experiment results verified the proposed converter’s feasibility in addressing issues of transformerless DC/AC converters in grid-connected PV systems.

Item Type: Article
Uncontrolled Keywords: Transformerless, Grid-connected inverter, Low ground-leakage current, Constant common-mode voltage, High step-up dc–dc converter
Subjects: T Technology > T Technology (General)
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Electrical Engineering > Department of Power Electronics & Drives
Depositing User: Mohd. Nazir Taib
Date Deposited: 20 Dec 2018 14:15
Last Modified: 13 Jul 2021 03:20
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