University of Illinois Urbana-Champaign

Cyber-physical systems of microgrids and control strategies for enhancing electrical grid resilience

Buason, Paprapee

Content Files
BUASON-THESIS-2019.pdf

Permalink

https://hdl.handle.net/2142/105072

Description

Title
Cyber-physical systems of microgrids and control strategies for enhancing electrical grid resilience
Author(s)
Buason, Paprapee
Issue Date
2019-04-22
Director of Research (if dissertation) or Advisor (if thesis)
Sauer, Peter W.
Department of Study
Electrical & Computer Eng
Discipline
Electrical & Computer Engr
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Date of Ingest
2019-08-23T20:36:06Z
Keyword(s)
Cyber-Physical Systems, Microgrid, Reachability Analysis, Attack Prevention, Attack Prevention, Cyberattack
Abstract
"A microgrid can be defined as a group of distribution, generation, storage, and loads. The concept has emerged to utilize renewable energy and increase resiliency of power systems. Modern microgrids rely on sophisticated communication and controls, which require them to interact with cyber-physical systems. In addition, this communication infrastructure is vulnerable to attacks that may potentially bring the whole microgrid system down for seconds to hours. This thesis presents control strategies and approaches for resiliency to attacks against measurements, while increasing system stability, and secure communications within microgrids when microgrids are disconnected from the utility, i.e. in islanded mode, when the frequency of microgrid is thus no longer maintained by the bulk grid. A sequence of operations to continuously serve specific critical loads is discussed. The thesis concludes with a use case that unifies all concepts. This use case serves to mitigate effects of an attack against measurements on a critical load bus. First, the attack is detected by the mean of detection algorithm or by the analysis from the ADVISE model. Then, the preventive algorithm called ""reachability analysis"" calculates the worst-case probabilistic bounds on whether the unstable states will be reachable within the required time budget. If unstable states are reachable, the command from COM600 will be sent and the suspicious distributed energy resource (DER) will be cut off. The appropriate tie line between two microgrids is closed to continuously supply power to the critical load when consensus from secondary frequency control is reached. Control strategies and communication take action to ensure stability of the new system. Results from real-time simulation validate the effectiveness of our approach."
Graduation Semester
2019-05
Type of Resource
text
Permalink
http://hdl.handle.net/2142/105072
Copyright and License Information
Copyright 2019 Paprapee Buason

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