Improved modulation techniques to eliminate leakage ground currents in three-phase photovoltaic systems

Author

Hao Huang ; Wenjie Chen ; Xiaomei Song

Author_Institution

State Key Lab. of Electr. Insulation & Power Equip., Xi´an Jiaotong Univ., Xi´an, China

fYear

2014

fDate

16-20 March 2014

Firstpage

2741

Lastpage

2745

Abstract

Nowadays transformerless PV converters are widely used in the energy conversion stage of a PV plant, because their good characteristics regarding efficiency, size, cost and weight. The main problem in transformerless PV systems is the common mode voltage variations that can generate leakage ground currents through the parasitic capacitance formed between the PV panels and ground. This paper comparisons the performance characteristic of conventional space vector PWM (SVPWM), AZSPWM, NSPWM and RSPWM. Based upon that, an improved AZSPWM scheme is proposed. Theoretical analysis is verified via simulation by means of MATLAB/SIMULINK.

Keywords

PWM power convertors; leakage currents; photovoltaic power systems; AZSPWM scheme; Matlab-Simulink; NSPWM; PV panels; PV plant; RSPWM; SVPWM; common mode voltage variations; energy conversion stage; improved modulation techniques; leakage ground current elimination; parasitic capacitance; space vector PWM; three-phase photovoltaic systems; transformerless PV converters; Inverters; Leakage currents; Parasitic capacitance; Space vector pulse width modulation; Vectors;

fLanguage

English

Publisher

ieee

Conference_Titel

Applied Power Electronics Conference and Exposition (APEC), 2014 Twenty-Ninth Annual IEEE

Conference_Location

Fort Worth, TX

Type

conf

DOI

10.1109/APEC.2014.6803692

Filename

6803692