A transformerless single-phase symmetrical Z-source HERIC inverter with reduced leakage currents for PV systems

Conference paper (2018)

Authors

Kerui Li The Chinese University of Hong Kong
Yanfeng Shen Aalborg University
Yongheng Yang Aalborg University
Z. Qin DC systems, Energy conversion & Storage - EEMCS
Frede Blaabjerg Aalborg University
Research Group
DC systems, Energy conversion & Storage (EEMCS) (TU Delft)
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Published Date

2018

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Electrical Sustainable Energy

Research Group

DC systems, Energy conversion & Storage

Abstract

A transformerless single-phase symmetric Z-source HERIC inverter featuring low leakage currents is presented in this paper. It is an attempt to utilize the Highly Efficient and Reliable Inverter Concept (HERIC) and an impedance source (Z-source) network to maintain a constant common mode voltage and thus low leakage currents in PV applications. The symmetric Z-source HERIC inverter requires two extra active switches. Nevertheless, the operation frequency of the two switches is the line frequency, leading to negligible losses. More importantly, the performance in terms of low leakage currents and harmonics is improved. Experimental tests are performed to validate the analysis and performance of the proposed system.

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