Contribuições para o processo da atribuição de responsabilidade das variações de tensão de curta duração baseado nos fatores de desequilíbrio

Abstract

Short-Duration Voltage Variation (SDVVs) represent significant deviations in the amplitude of the rms voltage value over a time interval shorter than three minutes. Despite their short duration, such phenomena exert substantial impacts on the quality, reliability, and safety of electrical power systems. Indeed, research studies indicate that the majority of complaints from generation, transmission, distribution agents, as well as end users, are predominantly associated with this type of disturbance. In response, the Brazilian Electricity Regulatory Agency (ANEEL), through the most recent revision of its Distribution Procedures (PRODIST), has introduced preliminary guidelines to regulate these disturbances and ensure adequate power quality levels. Within this context, the issue of identifying the agent responsible for such phenomena emerges as a motivating theme of this doctoral research. In this regard, although several publications addressing the determination of the responsible agent can be found in the literature, there is, to date, no methodology grounded on feasible procedures that enables straightforward field application. Aiming to fill this gap, a previous master’s dissertation developed within the UFU graduate program established the foundational elements of a related procedure. This approach was based on the mechanism of transferring voltage unbalance indicators through the boundary transformer between two agents, by comparing voltage unbalance factor measurements on both sides of the transformer during the occurrence of an SDVV. Notwithstanding the promising perspectives obtained, the methodology was investigated only at an embryonic stage, which motivated the continuation and expansion of the studies through the present doctoral research. Therefore, this work introduces methodological enhancements consisting of: the establishment of conceptual and mathematical foundations to support the proposed process; the extension of its applicability to topological configurations more representative of real-world power systems; and, finally, the experimental validation of the methodology. These advances, which constitute the focus of this research, enable the assessment of the reliability, robustness, and practical applicability of the proposed analytical method.