Trajectory Sensitivity Analysis of Rate of Change of Frequency Using System Frequency Response Model

摘要

This paper provides trajectory frequency sensitivity analysis of a large scale power system deploying its simple and reduced order system frequency response (SFR) under sudden load disturbances. By implementing this simple SFR model the calculation time of the real time simulation is reduced while maintaining the accuracy. The transfer functions and their related equations in the SFR model are firstly analysed. Then using trajectory sensitivity analysis, the effects of different parameters like reheat time constant, inertia constant, damping factor, governor regulation, and etc. on system frequency and its rate of change are investigated. The analysis is presented as the evolution of the sensitivities for the frequency and rate of change of frequency (RoCoF) in time with respect to the SFR's initial conditions helping to determine the importance of each parameter in different time frames. Furthermore, trajectory sensitivities are used for estimation of frequency response with perturbed parameters. The observations are useful for power system operators to quantify the grid frequency control capability.