Dedução de Funções de Alívio para Priorização de Variantes de Chaveamento Adequadas à Eliminação de Sobrecargas
Eventually, violations of voltage limits at buses or admissible loadings of transmission lines and/or power transformers may occur by the power system operation. If violations are detected in the supervision process, corrective measures may be carried out in order to eliminate them or to reduce thei...
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| Formato: | doctoralThesis |
| Idioma: | por |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/15153 |
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| Resumo: | Eventually, violations of voltage limits at buses or admissible loadings of transmission
lines and/or power transformers may occur by the power system operation. If violations are
detected in the supervision process, corrective measures may be carried out in order to
eliminate them or to reduce their intensity. Loading restriction is an extreme solution and
should only be adopted as the last control action. Previous researches have shown that it is
possible to control constraints in electrical systems by changing the network topology, using
the technique named Corrective Switching, which requires no additional costs. In previous
works, the proposed calculations for verifying the ability of a switching variant in eliminating
an overload in a specific branch were based on network reduction or heuristic analysis. The
purpose of this work is to develop analytical derivation of linear equations to estimate current
changes in a specific branch (due to switching measures) by means of few calculations. For
bus-bar coupling, derivations will be based on short-circuit theory and Relief Function
methodology. For bus-bar splitting, a Relief Function will be derived based on a technique of
equivalent circuit. Although systems of linear equations are used to substantiate deductions,
its formal solution for each variant, in real time does not become necessary. A priority list of
promising variants is then assigned for final check by an exact load flow calculation and a
transient analysis using ATP Alternative Transient Program. At last, results obtained by
simulation in networks with different features will be presented |
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