Desenvolvimento e Implementação de um sistema de monitoramento de qualidade de energia para tomada de decisões em sistemas de transmissão

Abstract

The growing penetration of large blocks of renewable energy based on electronic inverters in power transmission systems can decrease the power quality of these systems, especially with increasing harmonic and interharmonic distortion and voltage fluctuation. Poor electrical power quality (PQ) can negatively affect the protection system and can cause premature aging of electrical equipment connected to the power system. Thus, continuous monitoring of the PQ and in real time can be of great value for the operation, maintenance and expansion of the power systems. This dissertation presents the real-time PQ monitoring system recently implemented in two transmission substations of the company TBE (Transmissoras Brasileiras de Energia) as part of the Aneel R&D project “Development of a monitoring system for power quality and decision-making in transmission lines” and which involved the participation of several researchers from UFJF, UNIFEI and UFSC. The monitoring system is based on the philosophy of Digitally Enabled Substation Architecture or Substation 4.0 (SB4.0). SB4.0 involves concepts of open architecture, vendor independence, interoperability, and scalability. The system developed for monitoring the PQ receives samples of voltage and current signals from a Merging Unit (MU) through the IEC 61850-9-2 (SV) protocol and calculates the various power quality parameters. As the system uses the SB4.0 concept, power quality monitoring is a software application implemented on an industrial computer. In addition, the system provides a Data Recording application, which runs as an additional software task that provides instantaneous Total Harmonic Distortion (iTHD) triggered oscillography. This dissertation presents the main aspects of the architecture of the system developed and implemented, as well as the field results obtained from the two monitored substations.