Seminars & Events
Mathematics and Computer Science Division
"Implicitly Coupled Multiple Time-Scale Electrical Power Grid Dynamics Simulation"
DATE: August 31, 2011
TIME: 1:30 PM - 2:30 PM
SPEAKER: Shri Abhyankar, LANS Postdoc Interviewee
LOCATION: Building 240 Seminar Room 4301, Argonne National Laboratory
HOST: Barry Smith
Description:
The existing simulation tools for studying the different electrical power system dynamics are specifically tailored to a particular range of time scale and are divided into two groups: Transient Stability Simulators (TS) and Electromagnetic Transients Simulators (EMT). A Transient Stability simulator, running at large time steps, is used for studying relatively slower dynamics e.g. electromechanical interactions among generators and can be used for simulating large-scale power systems. In contrast, an electromagnetic transient simulator models the same components in finer detail and uses a smaller time step for studying fast dynamics e.g. electromagnetic interactions among power electronics devices. Simulating large-scale power systems with an electromagnetic transient simulator is computationally inefficient due to the small time step size involved.
By modeling the bulk of the large-scale power system in a transient stability simulator and a small portion of the system in an electromagnetic transient simulator, the fast dynamics of the smaller area could be studied in detail, while providing a global picture of the slower dynamics for the rest of power system along with not sacrificing computational efficiency.
This talk presents a novel implicitly coupled solution approach for this combined transient stability and electromagnetic transient simulation approach. To combine the two sets of equations with their different time steps, and ensure that the TS and EMT solutions are consistent, the equations for TS and coupled-in-time EMT equations are solved simultaneously. While computing a single time step of the TS equations, a simultaneous calculation of several time steps of the EMT equations is proposed.
Along with the implicitly coupled solution approach, this research work also presents an improvement over existing TS simulator by modeling all three phases instead of using a positive-sequence balanced representation.
Furthermore a parallel implementation of the developed three-phase transient stability simulator and the implicitly coupled multiple time-scale dynamics simulator, using PETSc, is discussed. Results of experimentation with different reordering strategies, linear solution schemes, and preconditioners are presented.
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