Robust Model-Following Control of Parallel UPS Single-Phase Inverters
Pascual, M.
Garcera, G.
Figueres, E.
Gonzalez-Espin, F.
Electron. Eng. Dept., Polytech. Univ. of Valencia, Valencia;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Aug. 2008
Volume: 55,
Issue: 8
On page(s): 2870-2883
ISSN: 0278-0046
Digital Object Identifier: 10.1109/TIE.2008.918602
First Published: 2008-02-22
Current Version Published: 2008-07-29
Abstract This paper presents a robust control technique applied to modular uninterruptible power-supply (UPS) inverters operating in parallel. When compared to conventional proportional–integral (PI) control, the proposed technique improves the response of the output voltage to load steps and to high distorted output currents, reducing the distortion of the output voltage. Furthermore, an excellent distribution of currents between modules is achieved, resulting in fine power equalization between the inverters on stream. The crossover frequency of the different loop gains involved is moderate, so that robustness to variations of the operation point and to modeling uncertainties is achieved. A comparative study with a two-loop conventional PI control scheme is presented. Experimental results on a 1-kVA modular online UPS system confirm the viability of the proposed scheme.
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