A high-performance DSP-controller for parallel operation of online UPS systems

Author

Guerrero, Josep M. ; De Vicuña, Luis García ; Matas, Jose ; Miret, Jaume ; Castilla, Miguel

Volume

1

fYear

2004

fDate

2004

Firstpage

463

Abstract

In this paper, a novel controller for parallel-connected online uninterruptible power supplies (UPS) without control interconnections based on the droop method is presented. The control approach consists in drop the frequency of every module when its output power increases, resulting in an unavoidable nominal frequency deviation. Consequently, this method in its original form is only applicable to off-line or line-interactive UPS systems. As opposed to the conventional droop method, the proposed control scheme endows proper transient response, strictly frequency and phase synchronization with the AC mains, and excellent power sharing even for nonlinear loads. Hence, this controller is suitable for paralleled online UPS systems. Experimental results are obtained from two parallel-connected 1-kVA online UPS by using TMS320LF2407A DSP.

Keywords

controllers; digital signal processing chips; synchronisation; transient response; uninterruptible power supplies; 1 kVA; DSP-controller; TMS320LF2407A DSP; UPS systems; droop method; frequency deviation; frequency synchronization; nonlinear loads; phase synchronization; power sharing; transient response; uninterruptible power supplies; Control systems; Digital signal processing; Frequency synchronization; Power engineering and energy; Power generation; Power harmonic filters; Transient response; Uninterruptible power systems; Voltage; Wires;

fLanguage

English

Publisher

ieee

Conference_Titel

Applied Power Electronics Conference and Exposition, 2004. APEC '04. Nineteenth Annual IEEE

Print_ISBN

0-7803-8269-2

Type

conf

DOI

10.1109/APEC.2004.1295849

Filename

1295849