Design of stabilizers by pole assignment with output feedback

Large interconnected power systems are provided with power system stabilizers to damp out the low frequency rotor oscillations introduced by fast and high gain excitation systems. Stabilizing signals from rotor speed, frequency and accelaration are commonly used. Classical control techniques have been widely used in the design of power system stabilizers although modern control theory has been applied recently.Three methods for stabilizer design using pole assignment technique with output feedback are presented. The first method uses modal control techniques with a least-square minimization method. The second and third involve static optimization. An algorithm for pole assignment by Sirisena and Choi is used in the second method, while a new algorithm for placing the closed loop poles inside a sector is used in the third method. Numerical examples are given to illustrate the methods.