Abstract
FACTS and HVdc systems may adversely affect the torsional dynamics of a turbine-generator system. Eigen-value analysis is a powerful approach for analysis of such instabilities. The size of the system is not a major constraint, as efficient selective eigen-value analysis tools are widely available. Eigen-value analysis requires an accurate small-signal model of the complete system including the Power Electronic Systems (PESs). Accurate analytical models of PESs are relatively harder to obtain as they may involve complex non-standardized controllers, and in case of thyristor switches, switching instants are a function of the external circuit. Frequency scanning is a simulationbased method of extracting the frequency-domain model of PESs from their time domain response to a small-amplitude wide-band input signal. The paper proposes the use of frequency scanning as a bridge between time domain simulation and eigen-value analysis. More precisely, the MultiInput Multi-Output frequency scans can be converted to Linear Time Invariant state space models using the well known vector fitting technique, and combined with the state-space model of the rest of the system. The effectiveness of this approach is demonstrated on a system having multiple series compensated lines and HVdc links.
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