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Your search keyword '"Schoenwald, David A."' showing total 38 results
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38 results on '"Schoenwald, David A."'

29. Design of the Pacific DC Intertie Wide Area Damping Controller.

Author

Pierre, Brian J., Wilches-Bernal, Felipe, Schoenwald, David A., Elliott, Ryan T., Trudnowski, Daniel J., Byrne, Raymond H., and Neely, Jason C.

Subjects
PHASOR measurement, REAL-time control, ELECTRIC lines, TEST systems, WIDE area networks, CLOSED loop systems
Abstract

This paper describes the design and implementation of a proof-of-concept Pacific dc Intertie (PDCI) wide area damping controller and includes system test results on the North American Western Interconnection (WI). To damp inter-area oscillations, the controller modulates the power transfer of the PDCI, a ±500 kV dc transmission line in the WI. The control system utilizes real-time phasor measurement unit (PMU) feedback to construct a commanded power signal which is added to the scheduled power flow for the PDCI. After years of design, simulations, and development, this controller has been implemented in hardware and successfully tested in both open and closed-loop operation. The most important design specifications were safe, reliable performance, no degradation of any system modes in any circumstances, and improve damping to the controllable modes in the WI. The main finding is that the controller adds significant damping to the modes of the WI and does not adversely affect the system response in any of the test cases. The primary contribution of this paper, to the state of the art research, is the design methods and test results of the first North American real-time control system that uses wide area PMU feedback. [ABSTRACT FROM AUTHOR]

Published
2019
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30. Battery Energy Storage State-of-Charge Forecasting: Models, Optimization, and Accuracy.

Author

Rosewater, David, Ferreira, Summer, Schoenwald, David, Hawkins, Jonathan, and Santoso, Surya

Abstract

Battery energy storage systems (BESS) are a critical technology for integrating high penetration renewable power on an intelligent electrical grid. As limited energy restricts the steady-state operational state-of-charge (SoC) of storage systems, SoC forecasting models are used to determine feasible charge and discharge schedules that supply grid services. Smart grid controllers use SoC forecasts to optimize BESS schedules to make grid operation more efficient and resilient. This paper presents three advances in BESS SoC forecasting. First, two forecasting models are reformulated to be conducive to parameter optimization. Second, a new method for selecting optimal parameter values based on operational data is presented. Last, a new framework for quantifying model accuracy is developed that enables a comparison between models, systems, and parameter selection methods. The accuracies achieved by both models, on two example battery systems, with each method of parameter selection are then compared in detail. The results of this analysis suggest variation in the suitability of these models for different battery types and applications. The proposed model formulations, optimization methods, and accuracy assessment framework can be used to improve the accuracy of SoC forecasts enabling better control over BESS charge/discharge schedules. [ABSTRACT FROM AUTHOR]

Published
2019
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37. Decentralized Inventory Control for Large-Scale Reverse Supply Chains: A Computationally Tractable Approach.

Author

Krishnamurthy, Prashanth, Khorrami, Farshad, and Schoenwald, David

Subjects
INVENTORY control, PRODUCTION control, SUPPLY chains, SUPPLY & demand, PRODUCT recovery, REVERSE logistics, COMPUTER-aided design, CYBERNETICS, SYSTEMS theory
Abstract

The article examines a new inventory control technique for large-scale supply chain such as repairs. The control system is based on a hierarchical two-level architecture which is held through a novel formulation of a bidirectional supply chain, and the control objective that is framed in an inherently decentralized setting. It explores the application of aircraft supply chains involving multiple original equipment manufacturers, depots, squadrons, bases, and planes. Suggested inventory control technique for specified supply chains are also discussed.

Published
2008
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38. Decentralized Control of Cooperative Robotic Vehicles: Theory and Application.

Author

Feddema, John T., Lewis, Chris, and Schoenwald, David A.

Subjects
MOBILE robots, ROBOTICS
Abstract

This paper describes how decentralized control theory can be used to analyze the control of multiple cooperative robotic vehicles. Models of cooperation are discussed and related to the input/output reachability, structural observability, and controllability of the entire system. Whereas decentralized control research in the past has concentrated on using decentralized controllers to partition complex physically interconnected systems, this work uses decentralized methods to connect otherwise independent nontouching robotic vehicles so that they behave in a stable, coordinated fashion. A vector Liapunov method is used to prove stability of two examples: the controlled motion of multiple vehicles along a line and the controlled motion of multiple vehicles in formation. Also presented are three applications of this theory: controlling a formation, guarding a perimeter, and surrounding a facility. [ABSTRACT FROM AUTHOR]

Published
2002
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