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Performance analysis of parallel-processing UPS systems

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3 Author(s)
Y. Lin ; Dept. of Electr. & Comput. Eng., Concordia Univ., Montreal, Que., Canada ; G. Joos ; J. F. Lindsay

Parallel-processing inverter-based uninterruptible power supply (UPS) systems have advantages over the conventional rectifier-inverter systems. Control is more complex and design tools are not readily available. The modeling, control and performance of a typical system are analyzed, and important parameters are identified. This UPS consists of an inverter-battery subsystem in shunt between the AC mains and the load. Two control loops are employed to fully exploit the advantages of the proposed UPS system: (1) a fast load voltage regulation loop; and (2) a slower battery charging loop. Mathematical models are developed to design the required regulators and compensation networks for both loops. The predicted performance characteristics are verified by simulation. Experimental results on a 5 kVA unit confirm the theoretical analyses

Published in:

Applied Power Electronics Conference and Exposition, 1993. APEC '93. Conference Proceedings 1993., Eighth Annual

Date of Conference:

7-11 Mar 1993