Development of a static equivalent for online security analysis of large scale power systems
Steady state security analysis is done to evaluate the system response for reasonable outages of transmission lines and generation stations or loss of loads. Reducing part of the system is usually desirable to reduce the computational effort. Power systems can be reduced by replacing loads and generators within the reduced portion by constant impedances and/or current sources. This is called the classical Ward reduction. It poses inaccuracy problems and convergence difficulties. Besides, a detailed description of the whole network is essential to start the reduction process. To improve the accuracy of the reduced models a new linearized reduction is developed. This reduction procedure uses the Jacobian of Newton's power flow. To make the on-line contingency analysis of large power systems practical, a fast decoupled based reduction is devised. Only the topological structure of the external network is used to obtain the equivalent. This reduction procedure is fully compatible with a state estimator for the internal system. The behavior of the retained system using the equivalent external system is virtually identical with the behavior of the retained system using the exact external system under a great number of operational outages and deviations in scheduled injections within the retained part. Unreported changes in the topology of the external system and its effects on the behavior of the reduced model are also examined. Fortunately, inaccuracies tend to be localized around the nodes near the contingency under study.
- OSTI ID:
- 5425881
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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