A Modified LLCL Filter With the Reduced Conducted EMI Noise

Author

Weimin Wu ; Yunjie Sun ; Zhe Lin ; Yuanbin He ; Min Huang ; Blaabjerg, Frede ; Chung, Henry Shu-Hung

Author_Institution

Dept. of Electr. Eng., Shanghai Maritime Univ., Shanghai, China

Volume

29

Issue

7

fYear

2014

fDate

Jul-14

Firstpage

3393

Lastpage

3402

Abstract

For a transformerless grid-tied converter using pulse width modulation, the harmonics of grid-injected current, the leakage current, and the electromagnetic interference (EMI) noise are three important issues during designing of the output filter. In this paper, the common mode and the differential mode EMI noises are investigated for the LCL- and LLCL-filter-based single-phase full-bridge grid-tied inverters. Based on this, a modified LLCL-filter topology is proposed to provide enough attenuation on the conducted EMI noise as well as to reduce the dc-side leakage current. The parameter design method of the filter is also developed. The comparative analysis and discussion on four filter cases (the conventional LCL filter, the conventional LLCL filter, the modified LCL filter, and the modified LLCL filter) are carried out and verified through simulations and experiments on a 0.5-kW, 110 V/50 Hz single-phase full-bridge grid-tied inverter prototype.

Keywords

PWM invertors; PWM power convertors; electromagnetic interference; interference suppression; leakage currents; network topology; power grids; power harmonic filters; DC-side leakage current reduction; LLCL filter topology; LLCL filter-based single phase full bridge grid tied inverter; attenuation; common mode EMI noise; conducted EMI noise reduction; differential mode EMI noise; electromagnetic interference; filter parameter design method; frequency 50 Hz; grid injected current harmonics; power 0.5 kW; pulse width modulation; transformerless grid tied converter; voltage 110 V; Capacitors; Electromagnetic interference; Harmonic analysis; Inverters; Leakage currents; Noise; Power harmonic filters; DC-side leakage current; EMI; LCL filter; LLCL filter; differential mode (DM); single-phase grid-tied inverter;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/TPEL.2013.2280672

Filename

6588986