Sistema de monitoramento de alto desempenho da qualidade daenergia elétrica

Abstract

The quality of electric power has become one of the most discussed topics in electrical power systems in recent years. The main reasons for such interest are the increasing in loads that are sensitive to electric disturbances and the greater integration of industry processes, where the failure of any component can lead to stop in production. In addition,there is greater awareness of electricity consumers, which demand better energy quality and the increase in non-linear loads that are sources of harmonic pollution to the power system. This study aims to present a platform developed on the CompactRIO controller from National Instruments using as a programming tool LabVIEW software. The objective of this platform is to monitor and detect disturbances that might occur in the power system. The tools for analysis and detection of disturbances are the fast Fourier transform (FFT), for monitoring system harmonics, and Wavelet transform for the detection of short-duration voltage variations (SDVF). Upon realizing a short duration voltage variation or a violation in the limits of harmonic content, the implementedsystem records the event and its time for later analysis. The platform also records the entire signal in the time domain, continuously. Post-processing is performed using the samples of the recorded signal. The user can choose how many cycles pre and/or post-disturbance one wishes to reconstruct for the analysis. The performance of the platform was validated through tests involving voltage sags, interruption and harmonic distortion