High-Efficiency Single-Phase Transformerless PV H6 Inverter With Hybrid Modulation Method

The main contribution of this paper is the derivation rules summarized from existing high-performance inverters with H6-type configuration, which makes novel topologies possible. In addition, a novel high-efficiency single-phase transformerless photovoltaic inverter with hybrid modulation method is...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2013-05, Vol.60 (5), p.2104-2115
Main Authors: Ji, Baojian, Wang, Jianhua, Zhao, Jianfeng
Format: Article
Language:English
Subjects:
Capacitors
Common-mode voltage
hybrid modulation method
Inductors
Inverters
Leakage current
Modulation
Noise
photovoltaic inverter
Topology
transformerless
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Summary:The main contribution of this paper is the derivation rules summarized from existing high-performance inverters with H6-type configuration, which makes novel topologies possible. In addition, a novel high-efficiency single-phase transformerless photovoltaic inverter with hybrid modulation method is also proposed and evaluated as an example. Without input split capacitors, common-mode voltage and leakage current issues in a nonisolated system with H6-type configuration are eliminated, and the feature of a three-level output voltage in the inverter bridge's middle point helps inductors and power quality optimization. The detailed operation principles with hybrid modulation strategy combined with unipolar and bipolar pulsewidth modulation schemes are presented. Experimental results of a 2200VA prototype verify the proposed topology with hybrid modulation method.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2012.2225391