A simplified control strategy for single-phase UPS inverters

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...

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Bibliographic Details
Published in:Bulletin of the Polish Academy of Sciences. Technical sciences 2014-06, Vol.62 (2), p.367-373
Main Author: Monfared, M.
Format: Article
Language:English
Subjects:
Control systems
Control theory
Electric potential
Feedforward
Inverters
multi-loop feedback
single-phase UPS
Strategy
UPS
Voltage
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Description
Summary: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.
ISSN:2300-1917
0239-7528
2300-1917
DOI:10.2478/bpasts-2014-0037