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Publication
Metodologia ótima para sistemas de ligação à terra em linhas de média e alta tensão
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| 3.9 MB | Adobe PDF |
Abstract(s)
Nesta tese é proposta uma nova metodologia para o desenho ótimo de sistemas de ligação à
terra das linhas de distribuição/transporte de energia elétrica. O método tem em conta
questões técnicas e económicas. O desenho deste tipo de sistemas está relacionado com um
problema linear inteiro misto (PLIM) em termos das características de construção e dos
requisitos específicos dos esquemas de ligação à terra dos apoios dos postes das diferentes
secções da linha.
Este problema minimiza os custos de investimento sujeito à taxa máxima de falha da linha
permitida devido a descargas atmosféricas, aos limites de volume de escavação para diminuir
o impacto ambiental, à tensão máxima de passo permitida, e ao limite para o aumento do
valor do potencial de terra.
A metodologia é aplicada a uma linha de transporte de 230 kV, com 85,4 km e 180 postes.
Os resultados são apresentados e comparados com os obtidos através dos modelos
convencionais, apresentando reduções significativas nos custos de investimento.
In this thesis it is proposed a new transmission/distribution line grounding system design optimization methodology. The method takes into account the technical and economic issues. The grounding systems design for transmission/distribution lines is stated as a mixed integer linear programming problem (MILP) in terms of the construction characteristics, and the particular requirements of the tower grounding schemes at the supports of each different line sections. This problem minimizes the investment costs subject to the maximum allowed line outage rate due to the lightning activity, excavation volume limits for lowering environmental impact, allowed maximum step voltage, and the limitation of the ground potential rise value. The methodology is applied to a 230kV transmission line with 85.4km and 180 towers. Results are presented and compared to the design obtained through conventional tower design approaches with important reductions in the investment costs.
In this thesis it is proposed a new transmission/distribution line grounding system design optimization methodology. The method takes into account the technical and economic issues. The grounding systems design for transmission/distribution lines is stated as a mixed integer linear programming problem (MILP) in terms of the construction characteristics, and the particular requirements of the tower grounding schemes at the supports of each different line sections. This problem minimizes the investment costs subject to the maximum allowed line outage rate due to the lightning activity, excavation volume limits for lowering environmental impact, allowed maximum step voltage, and the limitation of the ground potential rise value. The methodology is applied to a 230kV transmission line with 85.4km and 180 towers. Results are presented and compared to the design obtained through conventional tower design approaches with important reductions in the investment costs.
Description
Keywords
Descargas Atmosféricas Esquemas de Ligação à Terra Linhas de Distribuição Linhas de Transporte Otimização Programação Linear Inteira Mista Distribution Lines Grounding Systems Lightning Mixed-Integer Linear Programming Optimization Transmission Lines