Realistic Reduction of Nonlinear Networks

This paper describes a step-by-step network reduction technique which is accurate enough to provide realistic simulations of power systems with nonlinear loads. This method has been developed at Arizona State University as a part of an ongoing research program sponsored by the Electric Power Research Institute to investigate methods of economically extending transient stability simulations. Test results; from up to 49 bus examples indicate that the errors introduced by the network reduction are quite tolerable provided the angular swings and voltage deviations at retained buses are not excessive.