Prediction of voltage collapse in electric power systems
With the increased loading and exploitation of the power transmission system, the problem of voltage instability and voltage collapse has become a growing concern. Voltage instability of large power systems has been considered as a complex problem due to the large number of power system component...
| Main Authors: | , |
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| Format: | Article |
| Published: |
1996
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| Online Access: | http://journalarticle.ukm.my/1322/ http://journalarticle.ukm.my/1322/ |
| Summary: | With the increased loading and exploitation of the power transmission system, the
problem of voltage instability and voltage collapse has become a growing concern.
Voltage instability of large power systems has been considered as a complex problem
due to the large number of power system components participating in the voltage
collapse process. As a result, two distinct methods have been adopted for voltage
stability analysis, that is, the power flow based static method and the time simulation
based dynamic method. This paper analyses the basic mechanism of voltage collapse
by using the static and dynamic load models. A newly developed indicator using the
line stability factors is proposed with the aim of predicting voltage collapse in
transmission networks. The mathematical concept of the line stability factors is
explained and the factor which acts as indicator of proximity to voltage collapse is
defined such that it varies in the range between 0 (system stable) and 1 (voltage
collapse). The line stability factors are easily calculated and uses information of a
normal load flow. Tests carried out by using the line stability factors as indicators of
proximity to voltage collapse illustrate the advantages and simplicity of using the
factors. The prediction of voltage collapse caused by a uniform increase of the load as
well as due to other contingencies such as line outage and step increase in
mechanical load, is accurately obtained by using the line stability factors |
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