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Low-inertia DC microgrids rely on storage devices to buffer energy and handle abrupt load changes. An alternative approach involves the concept of power buffers. Proper adjustment of the input impedances of power buffers helps shape the trajectory of the transients imposed on DC microgrid. A communication network facilitates data exchange among active loads (loads augmented with power buffers). Such...
The legacy power system is gradually evolving into the smart grid. A variety of distributed control algorithms are being applied for smart grid energy management applications because of their flexibility, robustness, and local communication and computation features. These algorithms, however, increase the vulnerability of smart grid to adversaries. Thus, there is an urgent need to protect the distributed...
Industrial and governmental organizations have accrued vast amounts of data contained in many databases. Many of these databases are developed by different organizations for different purposes, may contain millions of unique entities and may lack a dependable global unique identifier to link an individual’s records across multiple databases. Record Linkage (RL) is a process that connects records that...
This paper proposes distributed noise resilient techniques for the secondary voltage and frequency control of AC microgrids. The effect of noise in reference signal on the synchronization process is studied. The same communication topology for the secondary control is adopted to implement noiseresilient algorithms. The efficacy of the consensus filters and distributed least mean-square algorithm for...
The Universal Physical Access Control System (UPACS) is a communication protocol designed to provide secure access to remote physical devices over untrusted communication networks, where it could be subjected to eavesdropping, unauthorized modification of its messages, and other forms of tampering by attackers. We created a reference implementation of the UPACS protocol and performed a security analysis...
This paper presents a novel method for closed loop control of magnetization process using feedback linearization. A macroscopic model for the temporal evolution of magnetization is developed to account for the physical phenomena of domain rotation and hysteresis. A tracking control system using feedback linearization method is derived to assure zero steady state error between the flux density with...
Cyber-Physical Systems (CPS) are systems with seamless integration of physical, computational and networking components. These systems can potentially have an impact on the physical components, hence it is critical to safeguard them against a wide range of attacks. In this paper, it is argued that an effective approach to achieve this goal is to systematically identify the potential threats at the...
Cyber-Physical Systems (CPS) applications are being increasingly used to provide services in domains such as health-care, transportation, and energy. Providing such services may require interactions between applications, some of which may be unpredictable. Understanding and mitigating such interactions require that CPSs be designed as open and composable systems. Composition has been studied extensively...
The authors collaborated with a power utility to evaluate input devices for use in the human system interface (HSI) for a new digital Turbine Control System (TCS) at a nuclear power plant (NPP) undergoing a TCS upgrade. A standalone dynamic software simulation of the new digital TCS and a mobile kiosk were developed to conduct an input device study to evaluate operator preference and input device...
This paper considers the optimal management of an N source, DC microgrid with time-varying sources and loads. Optimality is defined as minimizing the amount of power lost through the boost converters that connect the N sources to the DC bus. The optimal power apportionment strategy is part of an overall grid management system that also includes control laws that manage bus voltage and boost currents...
The cyber security exposure of resilient systems is frequently described as an attack surface. A larger surface area indicates increased exposure to threats and a higher risk of compromise. Ad-hoc addition of dynamic proactive defenses to distributed systems may inadvertently increase the attack surface. This can lead to cyber friendly fire, a condition in which adding superfluous or incorrectly configured...
Ubiquitous and resilient Internet connection access is becoming a necessity of life. Moreover, the amount of data requested by mobile users is increasing rapidly. Cooperative mobile Internet access is a promising approach to addressing these demands, by giving the mobile devices the opportunity to use the help of other devices to access the Internet. The helpers can download the data requested by...
The field of network and computer security is a never-ending race with attackers, trying to identify and patch software vulnerabilities before they can be exploited. In this ongoing conflict, it would be quite useful to be able to predict when and where the next software vulnerability would appear. The research presented in this paper is the first step towards a capability for forecasting vulnerability...
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