A 12-kVA DSP-Controlled Laboratory Prototype UPQC Capable of Mitigating Unbalance in Source Voltage and Load Current

Author

Axente, Iurie ; Ganesh, Jayanti Navilgone ; Basu, Malabika ; Conlon, Michael F. ; Gaughan, Kevin

Author_Institution

Dept. of Electr. & Comput. Eng., Univ. of Western Ontario, London, ON, Canada

Volume

25

Issue

6

fYear

2010

fDate

6/1/2010 12:00:00 AM

Firstpage

1471

Lastpage

1479

Abstract

This paper reports the development of a laboratory prototype of a fully digital DSP-controlled 12-kVA unified power quality conditioner (UPQC), capable of compensating for both the supply voltage and the load current imperfections. A fully digital controller based on the TMS320F2812 DSP platform is implemented for the reference generation as well as control purposes. The delay problem in the digital controller is overcome by application of a fast DSP, a compact control technique and proper flow of control steps in the DSP software. A phase-locked loop-less software grid synchronization method has been implemented for the effective operation of the UPQC under conditions of grid frequency variation. A sequence-based compensation strategy has been developed to compensate for balanced and unbalanced sags while accommodating the fact that the voltage injection capability of the UPQC is limited. The prototype UPQC power circuit, control features, and control algorithm along with experimental results are presented in this paper.

Keywords

digital control; digital signal processing chips; phase locked loops; power grids; power supply quality; synchronisation; DSP controller; UPQC; apparent power 12 kVA; balanced sags; digital controller; laboratory prototype; load current; phase locked loop; sequence-based compensation strategy; software grid synchronization method; source voltage; unbalanced sags; unified power quality conditioner; Current unbalance and nonlinear load; DSP-based control; power quality conditioning (PQC); unbalanced voltage sag; unified power quality conditioner (UPQC);

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/TPEL.2010.2040635

Filename

5393074