Dissertação (mestrado)—Universidade de Brasília, Faculdade de Tecnologia, Departamento de Engenharia Elétrica, 2009. / Submitted by Raquel Viana (tempestade_b@hotmail.com) on 2010-03-23T19:30:10Z
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Previous issue date: 2009 / Este trabalho versa sobre o desenvolvimento de um modelo para o planejamento da expansao da rede de transmissao, de longo prazo, que considera a seguranca do sistema (por meio do criterio N-1), o custo do congestionamento, o impacto das novas instalacoes na operacao do sistema e o risco associado com o crescimento incerto da demanda. A proposta e incluir na metodologia de planejamento a tolerancia a cortes de carga no criterio N-1 e, apos a rede de transmissao ser planejada para o crescimento previsto de carga, calcular o risco de corte de carga devido ao crescimento incerto da demanda. Assim, o modelo proposto associa, para cada corte de carga tolerado no planejamento, um nivel de custo total da expansao e um risco de corte de carga. Por sua vez, a decomposicao de Benders e empregada para segregar o problema de planejamento da expansao da rede de transmissao dentro de um problema mestre, que minimiza o custo da expansao, e dois subproblemas relacionados a adequacao da rede e ao despacho otimo de geracao. O risco de corte de carga e calculado pelo metodo de Monte de Carlo, a partir da estimacao do crescimento aleatorio da demanda e dos estados do sistema de transmissao planejado. Por fim, sao realizadas simulacoes para a rede de transmissao com 5, 14 e 24 barras, onde se mostra que, ao flexibilizar o criterio N-1 para tolerar o corte de carga, o numero de instalacoes novas, indicadas pelo planejamento, diminui e, por conseguinte, o custo total da expansao da transmissao, em detrimento do aumento do risco da rede projetada nao atender ao crescimento incerto da carga. __________________________________________________________________________________________ ABSTRACT / This work presents the development of a model for long term transmission expansion planning, which considers the system security (N-1 criterion), the cost of congestion, the impact of new facilities in system operation and the risk associated to demand growth uncertainty. It is proposed in the planning methodology the usage of load curtailment tolerance related to the N-1 criterion and, after the transmission network is planned for the expected demand growth, to calculate the risk of load cutting due to demand growth uncertainty. Thus, the proposed model associates to each tolerated load curtailment in planning, the level of total cost of expansion and a risk of load cutting. The Benders decomposition approach is utilized to divide the transmission network expansion planning problem into a master problem, which minimizes the cost of expansion, and two subproblems, representing adequacy of the network and optimal operation. The risk of load cutting is calculated by the method of Monte Carlo, from the estimation of the random growth of demand and the states of the planned transmission system. Finally, simulations are performed for the transmission network with 5, 14 and 24-bus, which show that by relaxing the criterion N-1 to allow the load curtailment, the number of new facilities, indicated by planning decreases and therefore the total cost of the expansion of the transmission; however, the risk of the designed network does not meet the uncertainty growth of load increase.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.unb.br:10482/4210 |
| Date | January 2009 |
| Creators | Caputo, Geovane Anselmo Silveira |
| Contributors | Cuervo Franco, Pablo Eduardo |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UnB, instname:Universidade de Brasília, instacron:UNB |
| Rights | info:eu-repo/semantics/openAccess |
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