A New Control Technique for Eliminating the Double-Frequency Current Ripple in UPSs

In this paper, a new control technique is proposed for use with an active filter / uniterruptible power supply (UPS) system. This technique is able to nearly eliminate the double line frequency current ripple on the battery side in UPS systems. The proposed control scheme is based on a novel digital control technique that can estimate the double line frequency current ripple very accurately. Therefore, the ripple can be eliminated by the active filter allowing the battery to be charged and discharged with a nearly dc current. This control system is well-suited for UPSs with Lithium-Ion batteries, where the current ripple is very limited. The proposed adaptive ripple extractor is designed based on the Proportional-Resonant (PR) controller and uses adaptive coefficients to provide robustness against frequency variations and uncertainties in the system. The proposed control system has been implemented on an experimental prototype. Simulation and experimental results verify the feasibility of the proposed control system and demonstrate its superior performance.

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