1990 Volume 110 Issue 12 Pages 1043-1048
This paper proposes a new estimation technique of dominant mode profile for dynamic security assessment and stability enhancement of a power system. The mode profile, which describes the distribution of the mode oscillation to the rotor speed responses of all mechines, can be obtained by using a newly developed filter, that is, a “Dominant Mode Filter (DMF)”. The DMF can be used in detecting the degradation of damping effect of the system and improving the stabilizing ability of a control device such as PSS. The basic concept of the DMF is based on the inherent characteristic of the power system network and the application of principal component analysis to a covariance matrix of the rotor speed fluctuations. The mode profile and the mode energy estimated by the DMF can be used for the following applications. One of them is to use the mode energy and the mode profile for on-line stability monitoring. Another one is a disturbance identifier to find out the location and the severity of a disturbance. The third application is the enhancement of stabilizing ability and adaptability of PSS.