A GENERATION RESCHEDULING METHOD TO INCREASE THE DYNAMIC SECURITY OF POWER-SYSTEMS

In this paper, a new method is proposed for dynamic security dispatch. The idea of coherent behavior of generators is used to find a new gen eration configuration with better transient stability behavior. Resche duling the generation in the power system improves system security by increasing the critical clearing time or the transient energy margin w ithout changing total generation. The calculation in the proposed meth od is simple and direct; the generation rescheduling depends only on t he original generation and inertia constants of the machines, and thei r rotor speeds at the fault clearing time. In this work, the transient energy function (TEF) method is used to check the dynamic security of the system by analyzing all credible three phase faults with single l ine outages. If the worst energy margin is not acceptable, the propose d rescheduling is done, and the security is checked again. The method has been tested on the Ontario Hydro 55-bus 11-generator system, the I EEE 145-bus 50-generator system and the IEEE 162-bus 17-generator syst em. Results on several loading levels of the 162-bus 17-generator syst em are also shown.