BY SENSITIVITY KTHODS

A new method for determination of vol- tage stability condition in a power system is presen- ted. The method is based on sensitivity techniques, taking into account the limits on reactive power gene- ration capacities. A distance to voltage collapse in terms of MVAr is defined as a measure of system secur- ity. Results from calculations on a 480-bus network with 140 generators is presented. The method can be efficiently used for reactive power security evaluation both in system planning and operation.