Control Strategy for Flexible Microgrid Based on Parallel Line-Interactive UPS Systems
Guerrero, J.M.
Vasquez, J.C.
Matas, J.
Castilla, M.
de Vicuna, L.G.
Dept. of Autom. Control Syst. & Comput. Eng., Tech. Univ. of Catalonia, Barcelona;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: March 2009
Volume: 56,
Issue: 3
On page(s): 726-736
ISSN: 0278-0046
INSPEC Accession Number: 10500877
Digital Object Identifier: 10.1109/TIE.2008.2009274
First Published: 2008-11-18
Current Version Published: 2009-02-27
Abstract
In this paper, the control strategy for a flexible microgrid is presented. The microgrid presented here consists of several line-interactive uninterruptible power supply (UPS) systems connected in parallel. The control technique is based on the droop method to avoid critical communications among UPS units. Thus, a flexible microgrid is obtained to operate in either grid-connected or islanded mode. A small-signal analysis is presented in order to analyze the system stability, which gives rules to design the main control parameters. Simulation and experimental results are presented, showing the feasibility of the proposed controller.
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