A simplified Small-Signal Model for Analyzing the Parallel Operation of Frequency Inverters in UPS

This paper deals with a small-signal model for analyzing the parallel operation of frequency inverters used in Uninterruptible Power Supplies - UPSs. The UPSs operate without communication with each other and is controlled by the traditional droop method. Initially, small-signal models of a single u...

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Bibliographic Details
Published in:	2018 13th IEEE International Conference on Industry Applications (INDUSCON) pp. 775 - 782
Main Authors:	Saldanha, Marcos A., Filho, Rubens M. Santos, Cortizo, Porfirio C., Stopa, Marcelo M., Luiz, Alex-Sander A.
Format:	Conference Proceeding
Language:	English
Published:	IEEE 01-11-2018
Subjects:	Analytical models droop Electrical engineering inverter parallelism Inverters Mathematical model microgrids Parallel processing Reactive power small-signal model Uninterruptible power systems UPS
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Summary:	This paper deals with a small-signal model for analyzing the parallel operation of frequency inverters used in Uninterruptible Power Supplies - UPSs. The UPSs operate without communication with each other and is controlled by the traditional droop method. Initially, small-signal models of a single unit connected to an infinite bus and those referring to several ones connected in parallel are revisited. Then, considering a set of common parameters, comparisons are made between the eigenvalues and the dynamic responses found for two systems: (i) an inverter connected to an infinite bus and (ii) two inverters operating themselves in parallel. Simulations and experimental results have shown the possibility of simplifying the small-signal model to represent the parallelism of frequency inverters operating in several situations, making their analysis and design simpler.
DOI:	10.1109/INDUSCON.2018.8627340