Modeling and simulating an UPS system with feedforward and feedback control

Author

Khalil, Hamdy S. ; Shehata, Somaya A. ; El-Bakry, Mahmoud A. ; Aly, Abou EL-Maaty M

Author_Institution

Ain Shams Univ., Cairo, Egypt

Volume

3

fYear

1997

fDate

27 Jul-1 Aug 1997

Firstpage

1732

Abstract

To achieve proper operation of an online static uninterruptible power supply (UPS) system, feedforward and feedback (FF/FB) controls are introduced. Feedforward control is applied to reduce the low order harmonics in the output voltage due to the ripples included in the input DC voltage to the UPS inverter resulting from the controlled rectifier, while feedback control is applied mainly for stabilizing the output voltage. In this paper, a feedforward technique is selected that was found to give free ripple output, and two types of feedback techiques are compared and the most suitable one is considered. The paper gives the modeling and simulation results of the whole system, that compare the performance without and with FF/FB under different steady state and transient conditions

Keywords

control system analysis; feedback; feedforward; harmonic distortion; power system harmonics; stability; uninterruptible power supplies; voltage control; feedback control; feedforward control; low-order harmonics reduction; modeling; online static UPS system; output voltage ripple; output voltage stabilisation; performance comparison; simulation; steady-state conditions; transient conditions; uninterruptible power supply; Control systems; Feedback control; Frequency; Power harmonic filters; Power system modeling; Pulse width modulation inverters; Rectifiers; Uninterruptible power systems; Virtual colonoscopy; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Energy Conversion Engineering Conference, 1997. IECEC-97., Proceedings of the 32nd Intersociety

Conference_Location

Honolulu, HI

Print_ISBN

0-7803-4515-0

Type

conf

DOI

10.1109/IECEC.1997.656683

Filename

656683