Output impedance performance for parallel operation of UPS inverters using wireless and average current-sharing controllers

Author

Guerrero, J.M. ; De Vicuña, L. Garcia ; Miret, J. ; Mata, J. ; Cruz, J.

Author_Institution

Dept. of Autom. Control Syst. & Comput. Eng., Tecnica Ind. De Barcelona, Spain

Volume

4

fYear

2004

fDate

2004

Firstpage

2482

Abstract

This paper encompasses the study of the output impedance impact of parallel-connected UPS inverters. Two novel nonlinear control strategies are proposed. The first one is based on the single-wire current-sharing scheme, which is well known in parallel dc-to-dc converter systems. The second one is a wireless control technique derived from the droop method. The output impedance of the inverters is investigated in both cases. Results of two parallel-connected 1-kVA UPS inverters show the feasibility of the proposed approach. Finally, the two proposed controllers are compared between them and those with the existing solutions.

Keywords

DC-DC power convertors; electric current control; invertors; nonlinear control systems; uninterruptible power supplies; 1 kVA; average current-sharing controllers; droop method; nonlinear control strategies; output impedance impact; parallel DC-to-DC converter systems; parallel-connected UPS inverters; single-wire current-sharing scheme; wireless control technique; Automatic control; Communication system control; Control systems; Distributed control; Frequency; Impedance measurement; Inverters; Uninterruptible power systems; Voltage control; Wire;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics Specialists Conference, 2004. PESC 04. 2004 IEEE 35th Annual

ISSN

0275-9306

Print_ISBN

0-7803-8399-0

Type

conf

DOI

10.1109/PESC.2004.1355219

Filename

1355219