The influence of grid-connected three-phase inverters on voltage unbalance

Author

Meersman, Bart ; Renders, Bert ; Degroote, Lieven ; Vandoorn, Tine ; Vandevelde, Lieven

Author_Institution

Dept. of Electr. Energy, Syst. & Autom. (EESA), Ghent Univ., Ghent, Belgium

fYear

2010

fDate

25-29 July 2010

Firstpage

1

Lastpage

9

Abstract

The increasing presence of single-phase distributed generators and unbalanced loads in the electric power system may lead to unbalance of the three phase voltages, resulting in increased losses and heating. To decrease this voltage unbalance problem three-phase four-wire inverter-connected distributed generation units may be used. In this paper, the influence of the control strategy of three-phase inverter-connected distributed generation (DG) units on voltage unbalance is studied. One of the control strategies is a damping control method for a three-phase four-wire inverter for DG units which behaves resistively towards voltage disturbances independently of the input power. The other control methods are the classical sinusoidal control strategy and the resistive control strategy. The simulation results show the positive effect of the damping control strategy on voltage unbalance.

Keywords

distribution networks; invertors; power grids; power system control; damping control method; distributed generation units; electric power system; grid-connected three-phase inverters; single-phase distributed generators; voltage disturbances; voltage unbalance; voltage-source inverter; distributed generation; neutral-point shifting; neutral-point-clamped VSI; resistive behaviour; three-phase voltage-source inverter (VSI); voltage unbalance;

fLanguage

English

Publisher

ieee

Conference_Titel

Power and Energy Society General Meeting, 2010 IEEE

Conference_Location

Minneapolis, MN

ISSN

1944-9925

Print_ISBN

978-1-4244-6549-1

Electronic_ISBN

1944-9925

Type

conf

DOI

10.1109/PES.2010.5589331

Filename

5589331