The all-dq-domain EMTP

This paper presents an improvement to dq-domain method of calculating electromagnetic transients. the proposed methodology works on dq-domain model for all components of the power system and during all time iterations. this is a new direction distinct from the old one where the network is invariably modeled in phase-domain. by modeling the network in dq-domain there is no more problem of interfacing machine to network as usually met in the existing method as machine is modeled invariably in dq-domain. besides eliminating the time consuming transformation procedure between dq-domain to phase-domain or visa versa the new method is able now to fully exploit the infinite stability region of the trapezoidal rule of integration. the prediction/correction procedure of the conventional dq-domain method,which is notoriously known limiting the stability region,is no longer required. comparing simulations using the new method and atp,one of the conventional dq-domain version,show perfect conformity for small time step. for long time step while atp is failing,the new method still converges accurately up to nyquist's interval.