APPLICATION OF A MODAL-BASED TRANSIENT ENERGY FUNCTION TO A LARGE-SCALE STRESSED POWER-SYSTEM - ASSESSMENT OF TRANSIENT STABILITY AND TRANSIENT VOLTAGE DIP

In this paper a modal-based transient energy function (MTEF) is used t o analyse a large-scale stressed power system exhibiting the inter-are a mode phenomenon. The analysis consists of two parts. In the first pa rt, direct transient stability analysis of the inter-area mode is cond ucted by determining the dominant modes of oscillation involved in the non-linear interaction. Using the machines that have large participat ion in these modes, relevant disturbed machine groupings are formed. T hese groupings are then used in the MTEF method for transient stabilit y assessment. In the second part, the MTEF is also used to predict the post-disturbance voltage dip at various buses using an energy based c riteria. The developed procedures are tested on a 161-generator cohere ncy-based dynamic equivalent of the Northern States Power system which is part of the Mid-continent Area Power Pool in North America.