Dynamic Security Dispatch: Basic Formulation

Abstract
This paper presents preliminary results on a direct method for dynamic security dispatch in large power systems. The usual indirect approach starts with an operating point chosen to give optimal economy; then contingency testing using simulation indicates icates adjustments which may be needed to ensquatere ade- uate transient stability after the most likely faults. The nature of the adjustments is derived from "intuitive ve feel" for the system. Using a model given by Bergen and Hill [1], distribution factors are presented for systemmatically improving transient stability with variation of bus powers, line impedances and bus voltages. s. By incorporating a stability index into the cost function for economic dispatch, there can be a trade-off ff between the requirements for economy and stability in choosing an operating point. The method could be adapted to either planning or on-line scheduling to ensure adequate dynamic security. The application of the approach is demonstrated on a 5 bus example system.

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