An efficient method of simulating stiffly connected power systems with stator and network transients included

A method is presented for simulating interconnected power systems with the stator and network transients included. This method is well suited for stiffly connected power systems in which tie-lines interconnecting the system components are electrically short (i.e. the tie-line charging capacitance can be neglected). The respective state-space models of the network and of the electric machines, combined with the algebraic constraint equations imposed by their interconnection, comprise a set of differential-algebraic equations which describes the composite system dynamics. A systematic procedure has been developed in which these differential-algebraic equations are used to establish a conventional state-space model of the composite system. Simulations of an example system have shown that the computation time associated with this method is comparable to that established using reduced-order models in which the stator transients are neglected