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This paper analyzed the development trend of uninterruptible power supply (UPS) and presented a multi-functional modular intelligent UPS system for smart grid, which is composed of four identical H-bridge converters. It not only can realize all the basic functions of the traditional UPS system, but also can realize the cyclic use of the electrical power between the power grid and storage battery. Moreover, due to the modular construction, it can easily change into various power converters for other applications. The topology configuration and operating principle of the proposed UPS system are analyzed, and a distributed control management strategy and a distributed logic control algorithm are proposed. At last, experimental results verify the validity and effectiveness of the proposed system and its control strategy. The exploration of this study could provide some valuable references for the design of next-generation electrical equipment in smart grid.
Zhao et al. (Wed,) studied this question.
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