Abstract: With the rapid development of renewable energy,power electronic converters represented by voltage source converters（VSCs） are widely used in new power systems.The electromagnetic transient simulation technology is limited by the simulation scale and computational efficiency,which makes it difficult to meet the demands of simulation and analysis of new power systems.This paper proposes a general modeling method of VSC based on state space equations and switching functions.The modeling method can accurately describe the external port characteristics of VSC,and the internal switching states are taken into account to realize the efficient modeling of different VSC topologies.Moreover,through the transformation of the state space equations of VSC,this method can also be coupled with the traditional electromagnetic transient solution algorithm using the nodal analysis method,to eliminate the delay between the solution of the branch where the VSC is located and the global solution of the system.Finally,the advantages of the proposed modeling method are verified by simulation comparison with the detailed model as a reference model.