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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
A Distributed Control Framework for Integrated Photovoltaic-Battery-Based Islanded Microgrids
Type
JournalPaper
Keywords
Distributed control, dispersed storage and generation, inverters, microgrid, secondary control.
Year
2017
Journal IEEE Transactions on Smart Grid
DOI
Researchers Mohammad Sadegh Golsorkhi ، Qobad Shafiee ، Dylan Lu ، Josep M. Guerrero

Abstract

This paper proposes a new cooperative control framework for coordination of energy storage units (ESUs), photovoltaic (PV) panels, and controllable load units in single-phase low voltage microgrids (MGs). The control objectives are defined and acted upon using a two level structure; primary and secondary control. Unlike conventional methods, a V–I droop mechanism is utilized in the primary control level. A distributed strategy is introduced for the secondary control level to regulate the MG voltage and manage state of charge (SoC) and power among the ESUs. The distributed secondary controllers are coordinated based on a leader-follower framework, where the leader restores the MG voltage to the rated value and the followers manage the sharing of power between the ESUs so as to balance the SoCs. Once the ESUs reach the minimum charge level, the information state increases above a positive critical value, at which point load control units perform load shedding. Similarly, fair PV curtailment is conducted in case the ESUs reach the maximum charge level. Experimental results are presented to demonstrate the efficacy of the proposed method.