Power quality meter and method of waveform anaylsis and compression

摘要

A method for waveform analysis and compression includes determining harmonic components of a waveform, subtracting the harmonic components from the waveform, leaving a residual waveform, and compressing the residual waveform. Information about the harmonic components and the compressed residual transform can be transmitted across a network for analysis or reconstruction of the waveform in another device. The method is used in a low cost power quality meter, which can form part of a smart metering scheme.

主权项

1. A method for performing power quality analysis of an electrical power system using a smart meter associated with the electrical power system, the method comprising:
capturing an original waveform of the electrical power system representative of one or more power quality disturbances using a current transformer of the smart meter; processing the original waveform to determine at least one of a frequency, an amplitude, and a phase information of a stationary component of the original waveform using an application processor of the smart meter; reconstructing a waveform based on the at least one of the frequency, the amplitude, and the phase information of the stationary component of the original waveform using the application processor of the smart meter; subtracting the reconstructed waveform from the original waveform to generate a residual waveform using the application processor of the smart meter; processing the residual waveform with a transform routine to determine one or more wavelet coefficients associated with the residual waveform using the application processor of the smart meter; processing the one or more wavelet coefficients to determine one or more power quality disturbances associated with the electrical power system using the application processor of the smart meter; classifying the one or more power quality disturbances immediately after determining the one or more wavelet coefficients associated with the residual waveform using the application processor of the smart meter; and transmitting, using a communication module of the smart meter, the one or more wavelet coefficients or the at least one of the frequency, the amplitude, and the phase information of the stationary component of the original waveform over a communication network to a remote central management system of a smart metering infrastructure associated with the smart meter for storage, reconstruction or analysis.