NDLI: Research on transformerless dual-buck full-bridge grid-connected inverter with H5-type for PV systems

Content Provider	IET Digital Library
Author	Dai, Yunzhong Li, Wenzhu Zhou, Chunhua Zhuang, Shengxian
Abstract	To eliminate the common-mode leakage current in the transformerless grid-connected photovoltaic (PV) system, inspired by the newly-developed embedded-switch H5 topology and dual-buck full-bridge grid-connected inverter (GCI), a novel transformerless dual-buck full-bridge GCI with H5-type (TDFGI-H5) topology for PV systems is firstly presented. Then, the operating modes and common-mode leakage current of TDFGI-H5 modulated by unipolar sinusoidal pulse-width modulation are analysed. The analysis result shows that TDFGI-H5 has the advantages of the three-level output, no shoot-through problem, high reliability, and can completely meet the condition of eliminating common-mode leakage current. Aim at the problem of the common-mode leakage affected by the switches’ junction capacitances, the effect of switch's junction capacitance is explored in detail when TDFGI-H5 is in the transient process that converts from non-decoupling states to decoupling states. Finally, the results of experiment verify the correctness of the theoretical analysis.
Starting Page	44
Ending Page	50
Page Count	7
ISSN	17554535
Volume Number	12
e-ISSN	17554543
Issue Number	Issue 1, Jan (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/12/1
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2018.5196
Journal	IET Power Electronics
Publisher Date	2018-10-23
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Common-mode Leakage Current Dual-buck Full-bridge Grid-connected Inverter Embedded-switch H5 Topology Full-bridge GCI Full-bridge Grid-connected Inverter H5-type Topology Junction Capacitances Leakage Current No Shoot-through Problem Nondecoupling State Operating Mode Photovoltaic Power System Power Electronics Power Grid Power Semiconductor Switches Power Supply PV System PWM Invertors Solar Power Stations Supervisory Circuit TDFGI-H5 Three-level Output Transformerless Grid-connected Photovoltaic System Transient Process Unipolar Sinusoidal Pulse-width Modulation
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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