A Topology Synthetization Method for Single-Phase, Full-Bridge, Transformerless Inverter with Leakage Current Suppression Part I

Xiumei Yue, Hongliang Wang, Xiaonan Zhu, Xinwei Wei and Yan-Fei Liu
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Xiumei Yue: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Hongliang Wang: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Xiaonan Zhu: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Xinwei Wei: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Yan-Fei Liu: Department of Electrical and Computer Engineering, Queen’s University, Kingston, ON K7L 3N6, Canada

Energies, 2020, vol. 13, issue 2, 1-19

Abstract: Single-phase full-bridge transformerless topologies, such as the H5, H6, or the highly efficient and reliable inverter concept (HERIC) topologies, are commonly used for leakage current suppression for photovoltaic (PV) applications. The main derivation methodology of full-bridge topologies has been used based on both a DC-based decoupling model and an AC-based decoupling model. However, this methodology is not suited to the search for all possible topologies, and cannot verify whether they are inclusive. Part I of this paper will propose a new topology derivation methodology based on unipolar sinusoidal pulse width modulation (USPWM) to search all possible full-bridge topologies for leakage current suppression. First of all, a unified circuit model is proposed, instead of the DC- and AC-based models. Secondly, a mathematic method called the MN principle is then proposed to search for all possible topologies, and a derivation procedure is provided. It was verified that all existing topologies could be found using the proposed method; furthermore, seven new topologies were derived. The proposed topology derivation methodology is extended to search topologies under Double-Frequency USPWM (DFUSPWM). Twenty topologies under USPWM and four topologies under DFUSPWM have been derived.

Keywords: transformerless inverter; full bridge inverter; leakage current; NPC topology (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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