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Qobad Shafiee

Qobad Shafiee

Academic rank: Associate Professor
ORCID:
Education: PhD.
ScopusId: 48161731600
Faculty: Faculty of Engineering
Address: Department of Electrical Engineering, University of Kurdistan, PO Box 416, Sanandaj, Kurdistan, Iran.
Phone:

Research

Title
Stability, Power Sharing, & Distributed Secondary Control in Droop-Controlled Microgrids
Type
Presentation
Keywords
Distributed control, inverters, microgrid, secondary control, voltage control
Year
2013
Researchers John W. Simpson-Porco ، Qobad Shafiee ، Josep M. Guerrero ، Florian Dorfler ، Francesco Bullo

Abstract

Motivated by the recent and growing interest in microgrids, we study the operation of droop-controlled DC/AC inverters in an islanded inductive microgrid. We present a necessary and sufficient condition for the existence of a synchronized steady state that is unique and locally exponentially stable. We discuss a selection of controller gains which leads to a sharing of power among the generators, and show that this proportional selection enforces actuation constraints for the inverters. Moreover, we propose a distributed integral controller based on averaging algorithms which dynamically regulates the system frequency in the presence of a time-varying load. Remarkably, this distributed-averaging integral controller has the additional property that it maintains the power sharing properties of the primary droop controller. Finally, we present experimental results validating our controller design, along with simulations of extended scenarios. Our results hold without assumptions on uniform line admittances, inverter power ratings, or voltage magnitudes.