Title page for ETD etd-02172012-231259


Type of Document Master's Thesis
Author Pal, Anamitra
Author's Email Address anam86@vt.edu
URN etd-02172012-231259
Title Coordinated Control of Inter-area Oscillations using SMA and LMI
Degree Master of Science
Department Electrical and Computer Engineering
Advisory Committee
Advisor Name Title
Thorp, James S. Committee Chair
Broadwater, Robert P. Committee Member
Centeno, Virgilio A. Committee Member
Keywords
  • Polytopic Model
  • Selective Modal Analysis (SMA)
  • Wide Area Measurements
  • Inter-area Oscillations
  • Linear Matrix Inequality (LMI) Control
Date of Defense 2012-02-17
Availability restricted
Abstract
The traditional approach to damp inter-area oscillations is through the installation of Power System Stabilizers (PSSs) which provide damping control action through excitation control systems of the generating units. However, study of recent blackouts has shown that the control action provided by a PSS alone is not sufficient for damping oscillations in modern power systems which operate under stressed conditions. An integrated form of control using remote measurements to coordinate the different control elements present in the system is the need of the hour.

One way of implementing such a coordinated control is through the development of a Linear Matrix Inequality (LMI)-based polytopic model of the system that guarantees pole placement for a variety of operating conditions. The size of the polytopic formulation is an issue for application of LMIs to large systems. The use of Selective Modal Analysis (SMA) alleviates this problem by reducing the size of the system. The previous attempts have used a model containing all the and modes, with SMA being used to eliminate all the other states. In practical applications the resulting system was still found to be too large to use in a polytopic model. This thesis presents an algorithm to reduce the size of the system to the relevant modes of oscillations.

A 16 machine, 68 bus equivalent model of the New England-New York interconnected power system is used as the test case with DC lines and SVCs acting as the control. The algorithm is then applied to a 127-bus equivalent model of the WECC System. The use of ESDs as a form of control is also demonstrated. The results indicate that the proposed control successfully damps the relevant modes of oscillations without negatively damping the other modes. The control is then transferred to a more detailed 4000+ bus model of the WECC system to realize its performance on real-world systems.

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