A class of multiple time scale algorithms for simulating power system frequency dynamics

In this paper the wide spectrum of the response times involved in the average system frequency dynamic behavior of power systems is exploited in the computer simulation of the power system. The various subsystem models of the power plants are decomposed into different time scales. A class of multiple time scale algorithm is proposed that used different time steps for the integration of the subsystems belonging to different time scale groupings. A special feature of the algorithms is the coordination of the interfaces between the different time scale solutions. Numerical study of a 5 bus power system is included to demonstrate the improvement in the solution time, stability, and accuracy of the new approach over previous methods.