Q-V curve interpretations of energy measures for voltage security
- 1 January 1994
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Power Systems
- Vol. 9 (1) , 331-340
- https://doi.org/10.1109/59.317593
Abstract
Energy methods have shown promise as measures for quantifying the vulnerability of power systems to problems of voltage instability and collapse. However, to make such measures more useful as a security assessment tool in an operational environment. It is important to provide physical interpretations of the quantitative measure. This paper demonstrates that for certain basic load models, the energy based security measure is equal to the area enclosed by a familiar Q-V curve, with a change of scale on the voltage axis. This interpretation has the added benefit of providing easily computed approximations to the maximum real and reactive power loadability both at individual buses and for the system as a whole. Results are demonstrated in detail on the IEEE 118 bus system, with additional tests on a 415 bus sample system.<>Keywords
This publication has 13 references indexed in Scilit:
- Some aspects of the energy function approach to angle and voltage stability analysis in power systemsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2005
- Parallel processing for the load flow of power systems: the approach and applicationsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2003
- Use of energy methods for on-line assessment of power system voltage securityIEEE Transactions on Power Systems, 1993
- Point of collapse methods applied to AC/DC power systemsIEEE Transactions on Power Systems, 1992
- Voltage security enhancement using energy based sensitivitiesIEEE Transactions on Power Systems, 1991
- Improved techniques for power system voltage stability assessment using energy methodsIEEE Transactions on Power Systems, 1991
- A method to compute reactive power margins with respect to voltage collapseIEEE Transactions on Power Systems, 1991
- An energy based security measure for assessing vulnerability to voltage collapseIEEE Transactions on Power Systems, 1990
- Towards a theory of voltage collapse in electric power systemsSystems & Control Letters, 1989
- Nonlinear oscillations in power systemsInternational Journal of Electrical Power & Energy Systems, 1984