In order to solve the problem of low efficiency of electromagnetic transient simulation in power system

we put forward a method of multi-rate electromagnetic transient parallel simulation based on MATE

which supports two or more kinds of simulation steps. The concepts of main synchronization

sub-synchronization and non-synchronization are proposed to describe the solution at different moments. At the time of non-synchronization

the calculation of the sub-network with small step is carried out by using the Thevenin’s equalization and Thevenin’s theorem interpolation. At the time of sub-synchronization

the calculation of sub-network with medium and small step is completed by using interpolation results and acquiring connecting line current. At the time of synchronization time

sub-networks are decoupled

and computing of whole network is completed by acquiring connection line current. The simulation results show that the proposed method can select the appropriate simulation step according to the characteristics of the sub-net

and can greatly improve the simulation efficiency without losing the simulation accuracy

which has important theoretical and practical significance for real-time simulation of large-scale power system.