Title :
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
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;
Journal_Title :
Industry Applications, IEEE Transactions on
