Small-signal stability for parallel-connected inverters in stand-alone AC supply systems

Author

Coelho, Ernane Antônio Alves ; Cortizo, Porfírio Cabaleiro ; Garcia, Pedro Francisco Donoso

Author_Institution

Sch. of Electr. Eng., Fed. Univ. of Uberlandia, Brazil

Volume

38

Issue

2

fYear

2002

Firstpage

533

Lastpage

542

Abstract

This paper presents a small-signal analysis for parallel-connected inverters in stand-alone AC supply systems. The control technique of the inverters is based on frequency and voltage droops, which depends on the local variable measurements and does not need control interconnections. Simulation and experimental results show that the system is well represented by the small-signal model. Some root locus plots for the system are provided, which make the stability studies and design easier

Keywords

DC-AC power convertors; control system analysis; control system synthesis; frequency control; invertors; power supplies to apparatus; power system stability; root loci; voltage control; VSI; control technique; frequency droops; local variable measurements; parallel-connected inverters; root locus plots; small-signal stability analysis; stand-alone AC supply systems; voltage droops; Communication system control; Control systems; Electric variables control; Frequency; Inverters; Power system control; Stability; Synchronous machines; Uninterruptible power systems; Voltage control;

fLanguage

English

Journal_Title

Industry Applications, IEEE Transactions on

Publisher

ieee

ISSN

0093-9994

Type

jour

DOI

10.1109/28.993176

Filename

993176