2 research outputs found
Foundations of Infrastructure CPS
Infrastructures have been around as long as urban
centers, supporting a society’s needs for its planning, operation,
and safety. As we move deeper into the 21st century, these
infrastructures are becoming smart – they monitor themselves,
communicate, and most importantly self-govern, which we denote
as Infrastructure CPS. Cyber-physical systems are now becoming
increasingly prevalent and possibly even mainstream. With the
basics of CPS in place, such as stability, robustness, and reliability
properties at a systems level, and hybrid, switched, and eventtriggered
properties at a network level, we believe that the time
is right to go to the next step, Infrastructure CPS, which forms
the focus of the proposed tutorial. We discuss three different
foundations, (i) Human Empowerment, (ii) Transactive Control,
and (iii) Resilience. This will be followed by two examples, one
on the nexus between power and communication infrastructure,
and the other between natural gas and electricity, both of which
have been investigated extensively of late, and are emerging to
be apt illustrations of Infrastructure CPS
Towards Resilient Cyber-Physical Energy Systems
In this paper, we develop a system-of-systems framework to address cyber-physical resilience, the ability to withstand the combined presence of both cyber attacks and physi-cal faults. This framework incorporates a definition of re-silience, a resilience metric as well as a resilient control de-sign methodology. The resilient control architecture utilizes a hybrid optimal control methodology combined with a dy-namic regulation market mechanism (DRMM), and is evalu-ated in the context of frequency regulation at a transmission grid. The framework enables the evaluation of both the clas-sical robust control properties and emerging resilient control properties under both cyber attacks and physical faults. The proposed framework is used to assess resilience of a Cyber-Physical Energy System (CPES) when subjected to both cyber and physical faults via DETERLab. DETERLab, a testbed capable of emulating high fidelity, cybersecure, net-worked systems, is used to construct critical scenarios with physical faults emulated in the form of generator outages and cyber faults emulated in the form of Denial of Service (DoS) attacks. Under these scenarios, the resilience and per-formance of a CPES that is comprised of 56 generators and 99 consumers is evaluated using the hybrid-DRMM control methodology