AC linear modeling of power-flow equations for contingency and security analysis of power systems
An iterative linear method to solve the ac load-flow equations is developed. Linearization of the equations is around some best known starting point such as a base-case solution. The resulting linear models are also used for the load-flow solution of systems with voltage dependent loads recognizing that, in practice, load-bus demands are not simple constants but vary interactively with system operating conditions. Application of the models to the security analysis of a power system is another important topic that is addressed. Based on a set-theoretical approach, the secure set of input variables, i.e., load and non-load independent variables, which do not result in out of limits values for any of the dependent variables, is found. These secure sets or regions are applied to optimization problems encountered in power system control. Also, the convex security regions are used for a novel contingency selection algorithm. In addition, two different methods based on two different philosophies are presented for the identification and ranking of critical outages. Finally, a new definition of severity and, hence, related performance indices is proposed. The new definition suggests that performance indices should be found based on the controllability of a power system under postulated outage conditions.
- Research Organization:
- Drexel Univ., Philadelphia, PA (USA)
- OSTI ID:
- 6275426
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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