A high performance controller for parallel operation of three-phase UPSs powering unbalanced and nonlinear loads

Author

Dehghan, S.M. ; Ahmad, A. Ale ; Lourakzadegan, R. ; Fazeli, M. ; Mohamadian, M. ; Abrishamifar, A.

Author_Institution

Electr. & Comput. Eng. Dept., Tarbiat Modares Univ., Tehran, Iran

fYear

2011

fDate

16-17 Feb. 2011

Firstpage

433

Lastpage

438

Abstract

In this paper, a high performance controller for parallel operation of uninterruptible power supplies (UPS) is proposed. The proposed controller is based on synchronous reference frame that is developed for parallel UPSs. Applying master-slave algorithm in this controller, power sharing and voltage regulation are controlled centrally by master UPS and commands are send through CAN bus to slave UPS. But each UPS performs voltage harmonic compensation locally and independently. Virtual impedance technique is used to share harmonic currents perfectly. Controller also is modified for unbalanced nonlinear loads. The performance of the proposed controller has been verified with simulation results for 20 KVA, 380 V three-phase parallel UPS.

Keywords

harmonic analysis; uninterruptible power supplies; voltage control; high performance controller; master-slave algorithm; nonlinear loads; parallel operation; synchronous reference frame; three-phase UPS powering unbalanced load; three-phase parallel UPS; uninterruptible power supplies; virtual impedance technique; voltage 380 V; voltage harmonic compensation; voltage regulation; Control systems; Harmonic analysis; Inverters; Power harmonic filters; Rectifiers; Uninterruptible power systems; Voltage control; Parallel operation; Synchronous reference frame controller (SRFC); Uninterruptible power supplies (UPS);

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics, Drive Systems and Technologies Conference (PEDSTC), 2011 2nd

Conference_Location

Tehran

Print_ISBN

978-1-61284-422-0

Type

conf

DOI

10.1109/PEDSTC.2011.5742460

Filename

5742460