سال انتشار: ۱۳۸۹
محل انتشار: دومین کنفرانس بین المللی الکترونیک قدرت و سیستم های درایو
تعداد صفحات: ۶
Dehghan – Electrical and Computer Engineering Department, Tarbiat Modares University
ahmad ale ahmad – Department of Electrical Engineering, Iran University of Science and Technology (IUST)
lourakzadegan – Electrical Converters & Power Systems Dept., IRIEE, ACECR, I.R.Iran.
fazeli – Electrical Converters & Power Systems Dept., IRIEE, ACECR, I.R.Iran.
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 20KVA, 380V three-phase parallel UPS.