The Stability Study of The Sub-Synchronous Resonance Via Sub- Eigenstructure Assignment Method

• Main Authors: Min-Yuan Lan, 藍敏原
• Other Authors: Tsong-Liang Huang
• Format: Others
• Language: zh-TW
• Published: 1993
• Online Access: http://ndltd.ncl.edu.tw/handle/93391847419228469815

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.