On-Line Security Constrained Economic Dispach Using Sensitivities and Convex Linear programming

Abstract A linear optimization model for real-time steady-state security dispatch of power systems is described. Thermal overloads of lines and transformers as well as inadmissible voltages are eliminated by changing real and reactive power of generating units and transformer taps controlling voltages and real power flows. Preventive rescheduling is treated, too. The optimization model is based on full steady-state ac sensitivity relationships and on the use of convex linear programming. The method is accurate, fast and reliable. Numerical results for several systems are presented.