A New Method for Multiple Finite-Element Models in Cosimulation With Electrical Circuit Using Machine Multiloop Modeling Scheme

The circuit-field coupling techniques, which could take the nonlinearity, time and space harmonics, core losses, and mechanical movement into consideration, have been widely applied in modern power system simulation. However, existing coupling schemes can deal with only one finite-element (FE) model connected to the external circuit. A new coupling method in which the generic machine model is established by the multiloop method and the parameters are extracted from FE analysis in real time is proposed in this paper. The introduced method allows one more transient FE model; adding to the arbitrary schematic with robust and reliable simulation results. The comparisons from the simulation results of the proposed method with strong coupling cosimulation and experimental results have verified the effectiveness of the new method. Furthermore, experimental tests of a three-stage generator system are carried out to validate the results from the coupling simulation with the proposed method.