FREQUENCY SCANNING TECHNIQUES FOR ANALYSIS OF THE EFFECT OF DEVICE DEPENDENT SUBSYNCHRONOUS OSCILLATIONS ON SUBSYNCHRONOUS DAMPING

摘要

This paper discusses and evaluates the approaches that can be applied to perform frequency scanning natured subsynchronous damping analysis by means of electromagnetic transient simulation. In this paper these time domain transient simulation related techniques are referred as dynamic frequency scanning techniques to separate them from the traditional frequency scanning technique applied to subsynchronous resonance screening studies. The two traditional dynamic frequency scanning approaches, modal response and signal injection method, are based on the analysis of the subsynchronous response of the electromechanical system on one single frequency at the time. Although multi-run functionalities has made these methods convenient to use, they cannot be considered effective, or screening study natured, if the damping analysis require for example modeling of highly detailed control systems or sensitivity studies covering high number of operational conditions and parameters. Therefore, spectral injection technique allowing the analysis of subsynchronous response over the whole subsynchronous frequency range at once is introduced to subsynchrnous damping analysis. The implementation of different dynamic frequency scanning methods is presented and the performance of the methods is evaluated using two different subsynchronous torsional interaction scenarios.