A study of frequency responses of generator electrical torques forpower system stabilizer design

摘要

Frequency response methods based on the concept of damping torquenenhancement have been successfully used in the design of practical powernsystem stabilizers. Central to this approach is the calculation of thenfrequency response from the automatic voltage regulator input to thenelectrical torque of a generator without the effect of rotor anglenfeedback. This paper carries out a study to deepen the understanding ofncertain important properties of the frequency response. It is shown thatnthe frequency response of a generator can be considered as having twoncomponents. One component, which depends only on the associatedngenerator, is very significant and has a great effect on the overallnfrequency response; it has the important property that its shape isnfixed independent of the operating condition of the associatedngenerator. The other component depends on the associated generator asnwell as on the external system. However, this component is found to bennot much affected by the dynamics of generators in the external systemnbecause of the diagonal dominance of the reduced admittance matrix ofnthe modified network with generators lumped into it as dynamicnadmittances