Abstract
The usual procedure adopted by power system engineers to determine the source of local or inter-area oscillations is to examine the speed components of the eigenvectors associated with the node under investigation. This approach does not always lead to the correct interpretation of the origin of the mode.The Participation Matrix used in parallel with the eigenvalue/eigenvector information will in general clearly identify those states which have most influence in producing a particular mode.This paper describes a procedure utilising the participation factors and eigenvector information to analyse system modes during recent investigations involving the retuning of power system stabilisers on four 350 MW thermal units in a 3 500 MW power system. The paper shows that predictions made during small disturbance analysis match those produced by transient stability analysis. Both sets of results are confirmed by actual system tests carried out during the retuning process.
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