A High-Performance Online Uninterruptible Power Supply (UPS) System Based on Multitask Decomposition Qiongbin Lin, Member, IEEE, Fenghuang Cai, Wu Wang, Sixiong Chen, Zhe Zhang, Senior Member, IEEE, Shi You, Member, IEEE
Abstract—High quality online uninterruptible power supplies
(UPS) are widely used in applications e.g. precision medical
equipment with critical loads. This paper proposes a low-cost
and high performance online UPS system. Firstly, the
performance improvement of a bidirectional switch based
bridgeless power factor (PFC) converter, which is regulated by a
hybrid control strategy with load current feedforward is studied.
Secondly, the proposed closed-loop controller integrates
improved predictive current control with predictive voltage
control and applies to the second-stage neutral-point-clamped
(NPC) three-level inverter for low output voltage harmonics.
Moreover, a push-pull dc-dc converter interfaces and boosts
voltage of a 24V battery bank as the backup energy source.
Considering complexity of the UPS system as well as cost
reduction, we implement a multi-task decomposition method for
control on a monolithic low-cost digital signal processor (DSP)
embedded with Control Law Accelerator (CLA). Finally, the
experimental results from a 1kVA a prototype can effectively
verify validly of the theoretical analysis and design.
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