Modeling, Analysis, and Design of Stationary-Reference-Frame Droop-Controlled Parallel Three-Phase Voltage Source Inverters

Author

Vasquez, Juan C. ; Guerrero, Josep M. ; Savaghebi, Mehdi ; Eloy-Garcia, Joaquin ; Teodorescu, Remus

Author_Institution

Inst. of Energy Technol., Aalborg Univ., Aalborg, Denmark

Volume

60

Issue

4

fYear

2013

fDate

4/1/2013 12:00:00 AM

Firstpage

1271

Lastpage

1280

Abstract

Power-electronics-based microgrids (MGs) consist of a number of voltage source inverters (VSIs) operating in parallel. In this paper, the modeling, control design, and stability analysis of parallel-connected three-phase VSIs are derived. The proposed voltage and current inner control loops and the mathematical models of the VSIs are based on the stationary reference frame. A hierarchical control scheme for the paralleled VSI system is developed comprising two levels. The primary control includes the droop method and the virtual impedance loops, in order to share active and reactive powers. The secondary control restores the frequency and amplitude deviations produced by the primary control. Also, a synchronization algorithm is presented in order to connect the MG to the grid. Experimental results are provided to validate the performance and robustness of the parallel VSI system control architecture.

Keywords

distributed power generation; electric current control; invertors; reactive power; stability; synchronisation; voltage control; active powers; amplitude deviations; control design; current inner control loops; droop method; frequency deviations; hierarchical control scheme; mathematical models; parallel VSI system control architecture; parallel-connected three-phase VSI system; power-electronic-based microgrids; reactive powers; stability analysis; stationary reference frame; stationary-reference-frame droop-controlled parallel inverter; synchronization algorithm; three-phase voltage source inverter design; virtual impedance loops; voltage inner control loops; Frequency control; Harmonic analysis; Impedance; Inverters; Reactive power; Synchronization; Voltage control; Distributed generation (DG); droop method; hierarchical control; microgrid (MG); voltage source inverters (VSIs);

fLanguage

English

Journal_Title

Industrial Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0278-0046

Type

jour

DOI

10.1109/TIE.2012.2194951

Filename

6184306