Desenvolvimento e implementação de uma metodologia para agregação temporal de ângulos de fase de componentes harmônicas

Abstract

Currently, the standards that define the protocols and procedures for measuring power quality parameters, such as harmonic distortions, are based only on quantifying the amplitudes of voltages and currents in each of the harmonic frequencies. Thus, the phase angles of the harmonic components, necessary for some types of analysis in power systems, are simply ignored. In view of this scenario, the present work aims to collaborate on the theme, proposing a methodology to perform the time aggregations of the phase angles of the harmonic components of voltage and current. The basis for proposing this new technique is the concept of harmonic energies associated with time intervals of aggregation. Initially, an analysis was carried out regarding the behavior of the phase angles of the harmonic voltage and current components, considering: individual loads (like some home appliances), low voltage customers and a medium voltage distribution feeder. From these analyzes, there was a prevalence of harmonic power flows, where they can be in the source-load or load-source direction. All analyzes were performed based on several measurements performed, both in the laboratory and in the field, considering the acquisition of voltage and current waveforms. Next, the proposed methodology was then developed, covering the necessary analytical developments to its implementation in hardware in a power quality meter, through a partnership with a national meter manufacturer. The developed device was submitted to a set of tests to verify the conformity of the measurements regarding the phase angles, to finally be installed in some real electrical installations in order to promote the realization of a small measurement campaign. The results obtained demonstrated the total convergence of the proposed methodology for the intended purposes, and comparisons made between the developed methodology and other few existing methodologies in the international technical literature demonstrated, unequivocally, the great relevance of the methodology developed in this work.