Effect of Turbine-Generator Representation in System Stability Studies

The effect of increasingly detailed turbine¿generator representation on calculated system stability limits is discussed. A new computer program which permits transient saliency, flux linkage variation caused by armature current, saturation, machine and system damping, the speed-governor system, and the excitation system to be represented is compared to previous computing methods. Swing curves and permissible loading limits for an example system obtained by using varying degrees of detail in machine representation are compared. The advantage of a complete machine representation in permitting a single study approach to transient, dynamic, and steady-state stability is brought out.