An improved soft-switching single-phase inverter for small grid-connected PV-system

Author

Amorndechaphon, Damrong ; Premrudeepreechacharn, Suttichai ; Higuchi, Kohji

Author_Institution

Dept. of Electr. Eng., Chiangmai Univ., Chiang Mai

fYear

2008

fDate

10-13 Nov. 2008

Firstpage

2125

Lastpage

2130

Abstract

In order to increase the conversion efficiency of grid-connected PV-systems, a high-efficiency PV power inverter with simple control methodology is required. To satisfy this requirement, an improved single-phase inverter using soft-switching technique is proposed. The proposed power inverter circuit is composed of a ZVT-PWM boost dc-dc converter and a LLCC resonant inverter. The dc-link voltage amplitude is controlled by ZVT-PWM boost dc-dc converter with soft-switching transition for all active switches. The stable sinusoid ac output voltage is inverted from dc-link voltage via a LLCC resonant inverter. The effectiveness of the proposed grid-connected inverter for small PV system is verified by simulation results.

Keywords

DC-DC power convertors; PWM power convertors; machine control; photovoltaic power systems; resonant invertors; voltage control; LLCC resonant inverter; PV power inverter; ZVT-PWM boost dc-dc converter; dc-link voltage amplitude control; grid-connected PV-system; soft-switching single-phase inverter; Costs; DC-DC power converters; Mesh generation; Photovoltaic systems; Power semiconductor switches; Pulse width modulation inverters; Resonant inverters; Switching converters; Switching loss; Zero voltage switching;

fLanguage

English

Publisher

ieee

Conference_Titel

Industrial Electronics, 2008. IECON 2008. 34th Annual Conference of IEEE

Conference_Location

Orlando, FL

ISSN

1553-572X

Print_ISBN

978-1-4244-1767-4

Electronic_ISBN

1553-572X

Type

conf

DOI

10.1109/IECON.2008.4758285

Filename

4758285