System output feedback controller design via O.S.A. method

The paper addresses the design of a system stabilizer using an optimal reduced order model by only the output state variables. System damping can be improved by using eigenvalues assignment and the co-ordination of stabilizers can be achieved through eigenvector assignment by maintaining system mode shape, this is defined as the optimal subeigenstructure assignment (O.S.A) method. The proportional-integral controller is derived via the optimal reduced order model instead of via the whole system model. The effectiveness of this stabilizer is evaluated, and this study reveals that the result of eigenstructure assignment is more stable and much better than in the assignment method based on the whole system model. A system is given as examples to illustrate the advantages and effectiveness of the proposed approach. Results based on the whole system model are included for comparison.