Abstract
High quality online uninterruptible power supplies (UPS) are widely used in applications, e.g., precision medical equipment with critical loads. This article proposes a low-cost and high-performance online UPS system. First, the performance improvement of a bidirectional switch-based bridgeless power factor converter, which is regulated by a hybrid control strategy with load current feedforward, is studied. Second, the proposed closed-loop controller integrates improved predictive current control with predictive voltage control and applies to the second-stage neutral-point-clamped three-level inverter for low output voltage harmonics. Moreover, a push–pull dc–dc converter interfaces and boosts voltage of a 24 V battery bank as the backup energy source. Considering complexity of the UPS system as well as cost reduction, we implement a multitask decomposition method for control on a monolithic low-cost digital signal processor embedded with control law accelerator. Finally, the experimental results from a 1 kVA prototype can effectively verify validity of the theoretical analysis and design.
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