A unified framework to study the voltage stability of the structure-preserving power system model

Date
1994
Authors
Lee, Byongjun
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V. Ajjarapu
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Altmetrics
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Electrical and Computer Engineering
Abstract

Recent major changes in power system operating practices have resulted in highly interconnected and heavily loaded power system networks. These changes have produced increased problems associated with maintaining acceptable voltage profiles in the network. This work attempts to develop a unified framework that can be used to study voltage stability in the structure-preserving power system model. The significance of this framework is that the methodology unifies various major contributions on voltage stability in such a way that these contributions become a subset of this framework. Salient features of this approach are: (1) Both the dynamic and static models that are relevant to voltage stability are included. (2) Realistic load increases and a generation sharing scheme with relevant limits are included. (3) For a given load increase and generation sharing scenario, all possible critical points that may lead to voltage instability are systematically traced and identified. (4) Systematic sensitivity analysis near all the critical points is included;A new invariant subspace parametric sensitivity (ISPS) method is developed. It provides the contribution of any parameter to a particular critical point. Results obtained from applying this framework to the IEEE New England 39-bus test system show that the ISPS method successfully identifies sources of instabilities by determining which parameters have the most influence on voltage instability. This framework systematically identifies the areas, components, and parameters that are responsible for a possible voltage collapse.

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