REAL-TIME ANALYTIC SENSITIVITY METHOD FOR TRANSIENT SECURITY ASSESSMENT AND PREVENTIVE CONTROL

An analytic sensitivity method is proposed for the transient security assessment of large power systems. It is based on the extended equal area criterion, and on a related transient stabiilty margin. It is shown that this margin leads to a simple algebraic formulation of sensitivity with respect to generation power, and possible applications to power system planning and online operation are suggested. For example, the computation of generation and load supply limits provides transient stability constraints and means of online transient security assessment and preventive control. Within the limits of the simplified electromotive force behind the transient reactance model, the method proves to be accurate, demanding little with respect to computing time and independent of the system size.