CPS Events
Localization and Mitigation of Cascading Failures in Power Systems
Line failure in power grid propgates in non-local, intricate and counterintuitive ways because of the interplay between power flow physics and network topology, making the mitigation of cascading failure difficult. The conventional approach to grid reliability is through building redundant lines. In this talk, we present an opposite approach to grid reliability through failure localization, by judiciously removing lines and adopting a new class of frequency control algorithms at real-time. The topology design partitions the network into regions that are connected in a tree structure. The frequency control automatically adjusts controllable generators and loads to minimize disruption and localize failure propagation. This approach is derived from a spectral representation of power flow equations that relates failure propagation to the graph structure of the grid through its Laplacian matrix. We summarize the underlying theory and present simulation results that demonstrate that our approach not only localizes failure propagation, as promised by the theory, but also improves overall grid reliability even though it reduces line redundancy.
(Joint work with Daniel Guo, Chen Liang, Alessandro Zocca, and Adam Wierman)
Bio
Advancing the state of grid digitalization with intelligent sensors and analytics
Abstract
The electric utility industry is undergoing an unprecedented business and technology transformation to address the rising challenges of decarbonization, decentralization, and digitalization. In this presentation, we will discuss the main elements of digital transformation and illustrate the rising role of intelligent sensors and advanced analytics with a special focus on grid reliability applications. Example use cases from field deployments will be used to demonstrate the realm of new possibilities with precision time stamping and analytics at-scale.
Bio
Dr. Mir Mousavi is currently Head of Advanced Analytics and Applications at Sentient Energy, a Koch Engineered Solutions Company. He joined Sentient Energy from ABB where he was most recently Global Technical Director in the Power Grids Division. He has served as program manager & industry liaison in various industrial forums and research consortiums. He has spent over two decades in various roles leading technology & strategy development and deployment in the areas of power system automation, intelligent monitoring, control, and protection.
He received his Ph.D. degree in electrical and computer engineering from Texas A&M University. He is a prolific industry speaker, author, mentor, and panelist. He holds over fifteen US and international patents and has published several journal articles and book chapters. Mir is a senior member of IEEE and IEEE Power and Energy Society (PES).
Recovering from Robot Failures by very fast Learning
Abstract
As we begin to deploy more and more robots in the field, we encounter a growing need for both autonomous recovery from failure, and for graceful degradation under damage. Both of these are properties of biological systems. Recently we have shown two different approaches that employ tools and insights from the mathematical modeling of animal locomotion to allow our robots to quickly recover from typical failures.
In one approach, our investigation revealed that the physics of multilegged running are a lot closer to swimming in low Reynolds number (Stokesian) fluids than they are to human running. By exploiting this fact, our robots could be made to learn how to move with only a few minutes of physical trials. When a failure occurs, the robots re-learn how to move even faster.
In another approach, the reformulation of robot dynamics in terms of simultaneous constraints allowed us to exploit the observation that many common failures are low-rank in terms of the constraints. By augmenting the constraints that survived the failure with a naive learning algorithm, our robots quickly re-learned how to perform the desired behavior.
Both approaches suggest that we are moving closer to animal-like abilities of recovery from damage.
Bio
Shai Revzen is an Assistant Professor of Electrical Engineering and Computer Science in the College of Engineering, and holds a courtesy faculty appointment in the Department of Ecology and Evolutionary Biology in the College of Literature, Science and the Arts. He received his PhD in Integrative Biology doing research in the PolyPEDAL Lab at the University of California at Berkeley, and did his postdoctoral work in the GRASP Laboratory of the University of Pennsylvania. Prior to his academic work, Shai was Chief Architect R&D of the convergent systems division of Harmonic Lightwaves (HLIT), and a co-founder of Bio-Systems Analysis, a biomedical technology start-up.
As principal investigator of the Biologically Inspired Robotics and Dynamical Systems (BIRDS) lab, Shai sets the research agenda and innovative tone of the lab. He believes in the intrinsic value of fundamental science, and of its transformative potential for robotics and future technology. Under his supervision, the lab combines work in three disciplines: robotics, mathematics, and biology.
Position Navigation and Timing (PNT) Vulnerability: Challenges and Solutions
Abstract
Position Navigation and Timing (PNT) have become ubiquitous, almost entirely based on Global Navigation Satellite Systems (GNSS) such as the US Global Positioning System (GPS). In all of these systems, the "P" and "N" systems are based on the "T", timing. Yet these systems are extremely vulnerable to intentional and unintentional interference. The US Department of Homeland Security (DHS) is releasing a Resilient PNT Conformance Framework, which defines four levels of resilience. But it does not say how a system can be shown to conform to any of these levels.
This talk has two focuses: how timing can be made more resilient with ensembling, and how one might begin to test a system to determine which level of resilience that system conforms to. Creating an ensemble with clocks has a number of advantages, though there is a cost as well. A clock as a timing source for a system can receive the support of the other clocks if it is a member of an ensemble, where it is continuously compared to the other clocks in the ensemble. This can increase the stability and reliability of any one clock. The cost, however, is there must be a method of continuous clock comparison, which has more strict requirements than those of general data networking. Ensembling also relates to PNT resilience, as a clock in an ensemble can detect spoofing more easily as well as obtain the time from the other clocks in the ensemble if the GNSS receiver is jammed, preventing access to time from GNSS.
We discuss the relationship and the status of these two issues: clock ensembling and PNT resilience. We then outline a number of interesting related research areas.
Bio
Dr. Weiss worked at the NIST Time and Frequency Division from 1979 through 2013. He has since been a consultant on precision timing systems for NIST and for various companies. He received several awards during his tenure at NIST. Also, he led the NIST program to support the GPS program office in developing their clocks and timing systems. In 1992, Dr. Weiss founded and has continued to lead the Workshop on Synchronization and Timing Systems (WSTS), now the premier conference on timing and synchronization in industry. In April, 2019, Dr. Weiss was awarded the Marcel Ecabert Lifetime Achievement Award “For his key contributions to remote clock comparisons, to time scale algorithm development and to accurate synchronization for science and industry.”
Radiation Detectors: Cyber-Physical Systems
Abstract:
In this talk, I will discuss advances in radiation detection and readout electronics being developed at the Radiological Instrumentation Laboratory at the University of California, Santa Cruz, and software algorithms that enable high temporal and spatial resolution performance in radiation detection. I will present two different applications of anomaly detection in security and nuclear medicine and seek areas of collaboration within the CPSRC.
Bio:
Shiva Abbaszadeh is an Assistant Professor at the University of California, Santa Cruz (UCSC) in the Electrical and Computer Engineering Department. Dr. Abbaszadeh’s lab at UCSC develops tools for anomaly detection in nonproliferation and improving cancer diagnosis and treatment. Dr. Abbaszadeh has been awarded a $2M NIH grant for advancing positron emission tomography in head and neck cancer and a $0.5M DOD grant for a feasibility study of large-area UV photodetectors.
