Title page for ETD etd-10162003-125452


Type of Document Dissertation
Author Huang, Liling
Author's Email Address liling@vt.edu
URN etd-10162003-125452
Title Electromechanical Wave Propagation in Large Electric Power Systems
Degree PhD
Department Electrical and Computer Engineering
Advisory Committee
Advisor Name Title
Phadke, Arun G. Committee Chair
De La Ree Lopez, Jaime Committee Member
Kohler, Werner E. Committee Member
Liu, Yilu Committee Member
Mili, Lamine M. Committee Member
VanLandingham, Hugh F. Committee Member
Keywords
  • Phasor Measurement Unit
  • Electromechanical Wave Propagation
  • Continuum
  • Power System Relaying
Date of Defense 2003-09-16
Availability unrestricted
Abstract
In a large and dense power network, the transmission lines, the generators and the loads are considered to be continuous functions of space. The continuum technique provides a macro-scale analytical tool to gain an insight into the mechanisms by which the disturbances initiated by faults and other random events propagate in the continuum. This dissertation presents one-dimensional and two-dimensional discrete models to illustrate the propagation of electromechanical waves in a continuum system. The more realistic simulations of the non-uniform distribution of generators and boundary conditions are also studied. Numerical simulations, based on the swing equation, demonstrate electromechanical wave propagation with some interesting properties. The coefficients of reflection, reflection-free termination, and velocity of propagation are investigated from the numerical results. Discussions related to the effects of electromechanical wave propagation on protection systems are given. In addition, the simulation results are compared with field data collected by phasor measurement units, and show that the continuum technique provides a valuable tool in reproducing electromechanical transients on modern power systems. Discussions of new protection and control functions are included. A clear understanding of these and related phenomena will lead to innovative and effective countermeasures against unwanted trips by the protection systems, which can lead to system blackouts.
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