Title :
A high-power multitransistor-inverter uninterruptable power supply system
Author :
Holtz, Joachim ; Lotzkat, Wolfgang ; Werner, Karl-Heinz
Author_Institution :
Wuppertal Univ., West Germany
fDate :
7/1/1988 12:00:00 AM
Abstract :
The active and reactive load distribution between n paralleled single-phase uninterruptible power supply (UPS) inverters is equalized by virtue of n-1 load-sharing control loops. The approach permits the construction of UPS systems of any desired power rating at maximum utilization of the power components. The method of harmonic cancellation decreases the switching frequency of the power devices while maintaining good dynamic performance. The design details of a 45 kVA UPS inverter system with 150% steady-state overload capability are presented. The performance under various operating conditions is illustrated by oscillograms.<>
Keywords :
invertors; power transistors; uninterruptible power supplies; 45 kVA; dynamic performance; harmonic cancellation; inverters; load distribution; load-sharing control loops; overload capability; power rating; power transistors; switching frequency; uninterruptable power supply; Inverters; Power supplies; Power system harmonics; Steady-state; Switching frequency; Uninterruptible power systems;
Journal_Title :
Power Electronics, IEEE Transactions on
