Construction and analysis of an automatic multirate time domain simulation method for large power systems

•We present a multirate method for time domain simulation of large power systems.•Stability analysis of the method for ODE and DAE cases is presented.•Dynamic partitioning of the differential and algebraic variables is performed.•The method is applied to a problem inspired from European transmission grid.

A multirate method for time domain simulation of large power systems is presented in this paper. Analysis of the proposed multirate method shows how the coupling between fast and slow components affects the numerical stability of the method. Numerical results for two power system examples are presented. Comparison with the corresponding standard integration method shows that substantial gain in computational work and CPU time can be obtained.