Steady-state phase-variable model of the synchronous machine for use in 3-phase load-flow studies

The derivation of a steady-state phase-variable model of the synchronous machine is considered for the purpose of investigating the influence of machine saliency on the unbalanced behaviour of powersystem networks. The model is particularly relevant as a means of representing the salient-pole generators of important hydroelectric stations feeding large and remote load centres. Application of the model is also considered so that corresponding blocks of the system Jacobian matrix are formulated and used in a previously described Newton ¿ Raphson algorithm to obtain 3-phase load flows. The results of computation illustrate that saliency is not an insignificant parameter amongst those which determine the extent and distribution of system unbalance.