Scientific Computing Seminar

Date:

Wednesday, November 3, 2004

Time:

11:00am-12:00pm

Location:

50D-3416

Seminar Speaker:

Vaibhav Donde
Department of Electrical and Computer Engineering
University of Illinois at Urbana-Champaign

Title:

Guaranteeing Dynamic Performance in Nonlinear Non-smooth Power Systems

Abstract:

The North American power grid is a large interconnected dynamic machine. Preventative and corrective actions are being taken at all times to ensure stable, reliable and economical operation. Costs of cascading failures are huge as clearly evident from August 2003 blackout. It is therefore important to identify triggering events that initiate such unacceptable behavior. A trajectory that just triggers a collapse process lies on the boundary between desirable and undesirable system responses. The talk presents a numerical strategy (based on a shooting method) for efficiently identifying such bounding cases. A connection is drawn to grazing bifurcations that capture similar dynamically critical situations in a variety of other application areas. The talk will also present an optimization algorithm for identifying control strategies to optimally alleviate system vulnerability to a given contingency. Power system dynamics are not smooth due to the presence of logic driven switching devices that introduce discontinuities in system variables and sudden changes in network topology. Accurate modeling in the form of a hybrid system is required to capture these non-smooth dynamics. Algorithm development has taken account of this hybrid system behavior.

Sponsor of Seminar:

Ali Pinar

Scientific Computing

Contact Esmond G. Ng EGNg@lbl.gov