FPGA-based online voltage/current swell segmentation and measurement
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abstract
Power-signal distortion is one of the main problems industry faces since it is produced by the use of non-linear loads and environmental disturbances. Swells are among the most common electrical disturbances that cause low power quality (PQ) in electric-energy delivery systems. Different methodologies have been proposed to detect disturbances, and as one of the most common electrical disruptions, the monitoring of voltage/current swells is an essential task for opportune correction and increase of the electric-system PQ. Unfortunately, most of the proposed methods for PQ monitoring do not perform a measurement of the disturbance time span. Hence, in this work, a novel method for detecting and measuring the time-length of voltage/current swells through spline interpolation and Otsu segmentation, implemented in an FPGA, is proposed. Obtained results from signals generated through a computer model and acquired from real experimentation demonstrate that the proposed approach can measure swell disturbances in the electric voltage/current signal from a distribution system with high resolution and precision, performing the time-span measurement of a swell disturbance in 81.3 μs, with high certainty of up to 99.945%25. Furthermore, the portability of the proposed hardware processing unit is shown by its implementation in FPGA devices from two different vendors.
