Title :
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
fDate :
27 Jul-1 Aug 1997
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;
Conference_Titel :
Energy Conversion Engineering Conference, 1997. IECEC-97., Proceedings of the 32nd Intersociety
Conference_Location :
Honolulu, HI
Print_ISBN :
0-7803-4515-0
DOI :
10.1109/IECEC.1997.656683
