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- W2362354818 abstract "Because of the parameter differences among units as well as the connection conductor impedances, the equivalent impedance of each UPS (uninterrupeted power system) inverter is different. In paralleled UPS system the DC bus voltage, IGBT conductor voltage and dead time of each UPS inverter also may be different. This difference can cause circulation current and decrease the load-sharing quality of paralleled UPS system. In order to solve the problem, besides the double loop controller of output voltage and inductor current, the output filter inductor current was being used to simulate a virtual resistance. The virtual resistance was added to decrease the influence of DC bus voltage and IGBT conductor voltage difference and dead time mismatch of paralleled UPS system. Virtual resistance could also decrease the influence of the other UPS inverter circulation current on the control precision of the paralleled UPS system. The proposed load-sharing control strategy could improve the current-sharing quality and stability of the paralleled UPS system. Experimental studies using DSP controlled parallel- connected 40 kVA three-phase four-wire UPS system were presented to show the effectiveness of the proposed control scheme." @default.
- W2362354818 created "2016-06-24" @default.
- W2362354818 creator A5062756194 @default.
- W2362354818 date "2009-01-01" @default.
- W2362354818 modified "2023-09-26" @default.
- W2362354818 title "Control Scheme of Paralleled UPS System Based on Output Virtual Resistance" @default.
- W2362354818 hasPublicationYear "2009" @default.
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