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Bulletin of the Polish Academy of Sciences Technical Sciences

The Journal of Polish Academy of Sciences


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A simplified control strategy for single-phase UPS inverters

1Department of Electrical Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad 91779-48974, Iran

© Bulletin of the Polish Academy of Sciences. Technical Sciences. This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY-NC-ND 3.0)

Citation Information: Bulletin of the Polish Academy of Sciences Technical Sciences. Volume 62, Issue 2, Pages 367–373, ISSN (Online) 2300-1917, DOI: https://doi.org/10.2478/bpasts-2014-0037, June 2014

Publication History

Published Online:
2014-06-13

Abstract

Though there are many strategies to control single-phase uninterruptible power supply (UPS) inverters, they suffer from some drawbacks, the main being complexity. This paper proposes a simple dual-loop controller for the single-phase UPS inverter with the LC filter. The suggested control scheme uses the capacitor current as the feedback signal in the inner current loop. No fictitious phase generation or reference frame transformations are required, and simple proportional gains are employed as both voltage and current regulators. A feedforward of the derivative of the output voltage is also proposed, which significantly improves the performance of the closed loop control system. Then, based on the model of the inverter with the proposed control strategy, a simple and systematic design procedure is presented. Finally, the theoretical achievements are supported by extensive simulations.

Keywords: single-phase UPS; multi-loop feedback; feedforward

References

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