An Efficient H7 Single-Phase Photovoltaic Grid Connected Inverter for CMC Conceptualization and Mitigation Method

Transformerless inverters are the economic choice as power interfaces between photovoltaic (PV) renewable sources and the power grid. Without galvanic isolation and adequate power convert design, single-phase grid connected inverters may have limited performance due to the presence of a significant...

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Bibliographic Details
Published in:Electronics (Basel) 2020-09, Vol.9 (9), p.1440
Main Authors: Mahmoudian, Mehrdad, M. G. Rodrigues, Eduardo, Pouresmaeil, Edris
Format: Article
Language:English
Subjects:
Bridges
Circuits
Efficiency
Energy conversion efficiency
Harmonic distortion
Inverters
Laboratory tests
Leakage current
Performance evaluation
Phase transitions
Photovoltaic cells
Pulse duration modulation
Reactive power
Topology
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Summary:Transformerless inverters are the economic choice as power interfaces between photovoltaic (PV) renewable sources and the power grid. Without galvanic isolation and adequate power convert design, single-phase grid connected inverters may have limited performance due to the presence of a significant common mode ground current by creating safety issues and enhancing the negative impact of harmonics in the grid current. This paper proposes an extended H6 transformerless inverter that uses an additional power switch (H7) to improve common mode leakage current mitigation in a single-phase utility grid. The switch with a diode in series connection aims to make an effective clamp of common mode voltage at the DC link midpoint. The principles of operation of the proposed structure with bipolar sinusoidal pulse width modulation (SPWM) is presented and formulated. Laboratory tests’ performance is detailed and evaluated in comparison with well-known single-phase transformer-less topologies in terms of power conversion efficiency, total harmonic distortion (THD) level, and circuit components number. The studied topology performance evaluation is completed with the inclusion of reactive power compensation functionality verified by a low-power laboratory implementation with 98.02% efficiency and 30.3 mA for the leakage current.
ISSN:2079-9292
2079-9292
DOI:10.3390/electronics9091440