Metodologia para estabelecimento de novos fatores de impacto base considerando agrupamentos de sistemas de distribuição

Abstract

Short-term voltage variations (STVVs) are events that affect the power quality and can cause great financial losses to industrial consumers who have loads sensitive to this disturbance, in addition to impairing the safety and reliability of processes. ANEEL, recognizing the importance of the matter, established through PRODIST the Impact Factor index to quantify the performance of the buses of a distribution system from the point of view of the STVVs. However, the base impact factor proposed in the regulation is unique, not considering the differences that the distribution systems have in relation to the potential cause of the event. In this context, this thesis presents a methodology for establishing different base impact factors for each distribution system. The work is focused on determining which variables best describe the disturbance and from these, establish clusters that allow a definition of more suitable base impact factors, considering the specificities of the distribution systems. To test the proposed methodology, real data from a concessionaire of the Brazilian electrical system was used. Nineteen substation bars were monitored through power quality meters. The methodology presented is generic and can be applied in any distribution system in Brazil, or even in other countries that may adopt an index similar to the impact factor. The results obtained in the case study showed that with the selected variables and the formed groups, it was possible to establish different base impact factors for each distribution system, which take into account the performance of similar systems. The application of the methodology brings benefits to the electricity sector, especially for consumers who have loads that are sensitive to short-term voltage variations, since it establishes basic impact factors that promote the improvement of the power quality.