Probabilistic simulation-based multi-objective optimization approach for hybrid power systems. • Study the uncertainties of renewable resources availability, load demand, and components failure. • Post-optimization sensitive analysis leads to unfeasible solutions. • Optimization with uncertainties implies higher costs for the same level of reliability. • Useful decision making tool to design optimum and robust power systems.
This paper investigates the impact of load shedding strategies on distribution system reliability cost indices, due to capacity deficiency conditions caused by unscheduled outages in the bulkgeneration and transmission (G&T)system. First, an integrated adequacy evaluation, including generation, transmission and distribution, is performed in order to provide detailed information on the interruptions experienced by the distribution customers. The G&T system is represented by a fictitious equivalent network, whose parameters are obtained by Monte Carlo non-sequential simulation. The equivalent G&T network is then connected with the distribution network and analyzed using minimal cut-set theory. The next step is the assessment of the reliability performance of the distribution system considering different load shedding priorities among feeders. The best strategy should account not only for the interruption costs but also for the traditional distribution indices (e.g. SAIFI, CAIDI etc.) imposed to the companies by the regulatory legislation. The proposed methodology is applied to a hybrid system created from two standard test systems. The results and their potential applications in the new power system competitive environment are discussed.
Este artigo apresenta uma nova metodologia para a análise da confiabilidade de sistemas de distribuição, onde se considera os impactos das falhas provenientes dos sistemas de geração e transmissão. Portanto, é viabilizada uma avaliação integrada, incluindo geração, transmissão (G&T) e distribuição, de modo a produzir uma informação mais detalhada sobre a causa das interrupções experimentadas pelos consumidores. O sistema G&T é representado por uma rede equivalente fictícia, cujos parâmetros são obtidos através de simulação Monte Carlo não-seqüencial. Esta rede equivalente G&T é conectada ao sistema de distribuição, que é então analisado utilizando a teoria dos conjuntos mínimos de corte. Índices de distribuição tradicionais (e.g. FEC, DEC, etc.) bem como a LOLC (Loss of Load Cost - Custo Esperado da Perda de Carga), são desagregados com o intuito de quantificar a contribuição dos sistemas G&T e distribuição em relação ao sistema total. O método proposto é testado em um sistema constituído pelo sistema de geração e transmissão IEEE-RTS, conectado ao sistema de distribuição IEEE-RBTS. Os resultados e suas potenciais aplicações para o novo cenário competitivo dos sistemas elétricos são discutidos. This paper presents a new methodology to evaluate the reliability of distribution systems considering the impact of failures from the generation and transmission (G&T) systems. Therefore, an integrated adequacy evaluation, including generation, transmission and distribution, is performed in order to provide a more detailed information about interruptions experienced by consumers. The G&T systems are represented by a fictitious equivalent network, whose parameters are obtained by Monte Carlo non-sequential simulation. The equivalent G&T network is then connected with the distribution network and analyzed by the minimal cut-set theory. Traditional distribution indices (e.g. SAIFI, SAIDI, etc.) as well as the LOLC - Loss of Load Cost - indices are disaggregated to measure the contribution of G&T and distribution systems on the overall system indices. The proposed method is applied to the IEEE-RTS, which represents the G&T system, connected with the RBTS, which represents the distribution system. The results and their potential applications to the new power system competitive environment are discussed
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