Conference proceedings article
Comparison of Modulation Techniques for a Single-Phase Full-Bridge Photovoltaic Micro-Inverter Considering Reactive Power Capability
Publication Details
Authors: | Brinker, T.; Hoffmann, L.; Friebe, J. |
Editor: | European Centre for Creative Economy |
Publisher: | Institute of Electrical and Electronics Engineers Inc |
Place: | United States |
Publication year: | 2021 |
Pages range : | 841-846 |
Book title: | 2021 IEEE Energy Conversion Congress and Exposition (ECCE) |
Title of series: | IEEE Energy Conversion Congress and Exposition |
ISBN: | 978-1-7281-5134-2 |
DOI-Link der Erstveröffentlichung: |
Abstract
In single-phase photovoltaic (PV) power systems parasitic module capacitances are a well-known issue as these create a path for high-frequency leakage currents which can cause electromagnetic interference (EMI) problems. A common method to achieve a limitation of these currents is the harmonization of the common-mode (cm) voltages generated by the modulation of the inverter. The objective of this paper is to provide an overview of the switching states and corresponding cm-voltage waveforms of unipolar modulation techniques for full-bridge (FB) inverters and to identify advantageous modulation schemes. The reactive power switching states are also considered. For the investigations a modified output filter is used. Further optimization using symmetric half-bridges and asymmetric half-bridges utilizing two different types of wide bandgap transistors are discussed in terms of thermal performance and parasitic switching node capacitances. Inverter prototypes of both variants are used for verification and performance analysis.
In single-phase photovoltaic (PV) power systems parasitic module capacitances are a well-known issue as these create a path for high-frequency leakage currents which can cause electromagnetic interference (EMI) problems. A common method to achieve a limitation of these currents is the harmonization of the common-mode (cm) voltages generated by the modulation of the inverter. The objective of this paper is to provide an overview of the switching states and corresponding cm-voltage waveforms of unipolar modulation techniques for full-bridge (FB) inverters and to identify advantageous modulation schemes. The reactive power switching states are also considered. For the investigations a modified output filter is used. Further optimization using symmetric half-bridges and asymmetric half-bridges utilizing two different types of wide bandgap transistors are discussed in terms of thermal performance and parasitic switching node capacitances. Inverter prototypes of both variants are used for verification and performance analysis.
Keywords
leakage current micro-inverter modulation scheme photovoltaic reactive power single-phase transformerless unipolar
