LINE OVERLOAD ALLEVIATION TECHNIQUE FOR COMPOSITE SYSTEM RELIABILITY STUDIES.

The adequacy of a composite generation and transmission system is normally assessed by examining the system for various combinations of generator and line outages. A problem encountered when conducting this form of study is that of overload transmission lines and transformers. This paper illustrates a direct method of determining the generation rescheduling and load curtailment pattern for alleviating line overloads with minimal computational expense. This technique uses a mathematical model based on a set of linearized relationships between line currents and state variables, and between bus injected powers and state variables. An algorithm is also proposed for solving the model in conjunction with the Newton-Raphson load flow approach.