| Summary: | 碩士 === 淡江大學 === 資訊工程研究所 === 81 === In the power system, the Sub-Synchronous resonance is an
important subject of the power system dynamic stability
research. When the resonance happened, it will often make the
rotor break seriously owing to take so much torsion. The
purpose of this theoresis is to use the "Sub-Eigenstructure
Assignment Theory" for designing the power system stabilizer
which can avoid the Sub-Synchronous Resonance. What the "Sub-
Eigenstructure Assignment Theory" means is to use Optimal
Reduced-Order Model to guarantee that the physical meaning and
effectiveness of the output state variables against loss,
following,to use the "Eigenstructure Assignment Technique"
which assign the eigenvalue and eigenvector at the same time to
reach our design, finally, to combine the decentralized
structure and the output feedback to achieve the power system
stabilizer. At the period of designing, we assign eigenvalue to
improve the damping of the electromechanical oscillation,
besides we study the meaning and influence of assigning
eigenvector. As the result, the eigenvalue will be a little
different from the assigned value, but that is no influence on
the system stability. On the other side, the assignments of the
eigenvectors are successful. The reason that the Sub-
Eigenstructure Assignment Method is better than the
Eigenstructure Assignment Method is that there are no other
eigenvalues worse than the assigned value will be created.
Since the Sub-Eigenstructure Assignment Method use the Optimal
Reduced-Order Model , the Physical character of that output
variable will be limitted and the dominant poles will also be
controlled. The power system Stabilizer in this theoresis can
be completed by the simple PI controller, so it is very
pratical.
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