Fast analysis of active power-frequency dynamics considering network influence

Analysis of frequency dynamics due to large active power imbalance is an important but time-consuming task of power system operation. Ignoring influence of reactive power and voltage on active power-frequency dynamics, a new direct current loadflow based frequency response model (DFR) is proposed in this paper. It is developed with “flat voltage” assumption to simplify generating unit and load models. Unlike average system frequency model (ASF) and system frequency response model (SFR), network is preserved in DFR model with direct current network equations. Accuracy and efficiency of DFR model are verified test systems. DFR model finds a balance point between full-time domain simulation and ASF model. It is a promising method for on-line evaluations.