Bond graph modeling of critical infrastructures for cyber-physical security implementation

“In developed societies, there exists infrastructure vital to everyday life. This includes water and power systems. Technology is quickly evolving and being implemented on these utilities. This technology can range from smart metering in neighborhoods to volume sensors in local waste water treatment facilities. When networking, sensing, monitoring, or control devices are integrated with infrastructure it is considered a cyber physical system, or CPS. When information about an important physical system is connected to the virtual world, it is opened up to security risks. Cyber security can be provided to the CPS by monitoring the physical state of the system and detecting virtual attacks when unexpected changes occur. However, these systems mentioned cross multiple domains: electrical, mechanical, and hydraulic amongst others. This creates a challenge, as each domain has its own unique language, terminology, and topology. To combat this challenge, a universal representation of these systems is implemented through the use of bond graphs. Bond graphs take advantage of the commonalities found in all physical scientific domains. These similarities are found in the energy interactions throughout a given system, and bond graphs allow these relationships to be mapped graphically and mathematically. This unifying notation creates a clear picture of the energy movement throughout a physical system. Information about the unifying bond graph method is discussed, and previous work and examples are relayed. To demonstrate the use of bond graphs on a power system, a realistic microgrid model was converted into a bond graph, simulated, and validated”--Abstract, page iv