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Calculation of Power System Dynamic Frequency during Simulation Phase

Abstract New monitoring devices such as Phasor Measurement Units (PMUs) and Frequency Disturbance Recorders (FDRs) are being added to power systems for real time measurements of system variables including dynamic frequency at different locations (buses). These frequency measurements will be used for real time control of power systems in near future. It is necessary to examine the performance of such control systems through simulation before actual implementation. During simulation phase, one needs the dynamic frequency as would be measured by PMUs/FDRs. This paper proposes a technique, based on the speeds of system generators, to calculate such frequency. The frequency calculated by the proposed method is compared with the frequencies of the individual generator, the frequency related to system center-of-inertia, and bus frequency calculated by other method.