System and method for operating electric power systems utilizing optimal power flow

An available transfer capability calculating system for operation of an electric power system providing generators, network load, voltage, current and frequency for calculating optimal power flow with respect to assumption failure occurring-in the electric power system and calculating available transfer capability of the electric power system based on the calculated value of the optimal power flow, comprising:

• an optimal power flow calculating processor for calculating mechanical output and electrical output of a generator containing a generator phase angle defined by a time function under a condition that the generator phase angle does not exceed a preset value to derive data associated with an initial phase angle and maximum electric power value of the generator;
• a data collecting section for collecting system configuration data of the electric power system used for making the calculation of said optimal power flow calculating processor;
• a data input section for inputting failure condition data and constraint data used for making the calculation of said optimal power flow calculating processor;
• and
• an output section for outputting data associated with the phase angle and maximum electric power value of the generator obtained by said optimal power flow calculating processor.