Safe Transient Operation of Microgrids Based on Master-slave Configuration
Location: USA
Publication date: 2011-11-01
Published in: IEEE Energy Conversion Congress and Exposition 2011, Phoenix (USA) - ECCE 2011
ref. DOI: 10.1109/ECCE.2011.6064058

Local members

Joan Rocabert

PhD. Senior Researcher

External members

Azevedo, G., Bradaschia, F., Calvancanti, M., Neves, F.



Master-Slave configuration is a suitable alternative to droop control method used in microgrids. In this configuration, only one inverter is the master, while the others are slaves. The slaveinverters are always current controlled whereas the master inverter should have two selectableoperation modes: current controlled, when the microgrid is connected to the grid; and voltage controlled, when it is operating in island mode. In grid-connected mode, the master needs a synchronization system to perform the accurate control of its delivered power, and, in island mode, it needs a voltage reference oscillator that serves as a reference to the slave inverters.Based on the master-slave concept, this paper proposes a single system that perform both functions, i.e., it can act as a synchronization system or as a voltage reference oscillator depending on an input selector. Moreover, the system ensures a smoothly transition between the two operation modes, guaranteeing the safety operation of the microgrid. Experimental results are provided to confirm the effectiveness of the proposed system.


Associated projects

National public