Abstract
In this paper, a high efficiency hybrid UPS based 3-level topology with ESS mode is proposed. The proposed hybrid UPS is a double conversion method that supplies stable power to the load while charging the battery, and automatically supplies power to the using the energy stored in the battery when the input power is unstable or power failure occurs. In addition, it has the advantage of being able to manage power by supplying power to the load using commercial power and battery power at the same time when the ESS mode is required for power shortage, peak load, or user convenience. Proposed UPS operates in four modes: normal mode, battery mode, ESS mode 1 and ESS mode 2. Also, if power factor improvement is required, the power factor of the opening can be improved by adjusting the phase of the input current. Finally, the usefulness of the proposed system is verified through experiments.
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