A Smart Meter System Based on Harmonic Extraction for Spectral Leakage Suppression

Abstract

The invention discloses a harmonic wave extraction-based intelligent ammeter system for frequency spectrum leakage suppression. The intelligent ammeter system comprises a front end induction circuit, a front end preprocessing circuit, an analog-to-digital converter, a digital signal processing module, an electric energy collection circuit, an interface circuit, an embedded processor module, a modulation and demodulation circuit, a wireless transmit-receive module, a low frequency filtering attenuation circuit and a narrowband antenna that are orderly connected. The harmonic wave extraction-based intelligent ammeter system for frequency spectrum leakage suppression also comprises a proportional coupling induction circuit, a power divider, a high harmonic wave filter, a high harmonic wave frequency range matching impedance network, a radio frequency switch, a high harmonic wave integrator, a high harmonic wave detector and a high harmonic wave comparator that are orderly connected. The harmonic wave extraction-based intelligent ammeter system can help suppress distribution and amplitude of sampling noise and frequency spectrum leakage as well as effects exerted by frequency domain aliasing; measurement data such as effective values, active power and the like of a fundamental wave signal component and a harmonic wave signal component can be obtained.

Description

technical field [0001] The invention relates to the technical field of electric meter systems, in particular to a smart electric meter system for suppressing frequency spectrum leakage based on harmonic extraction. Background technique [0002] The frequency of my country's power grid is 50Hz. The power industry calls the signal with a frequency of 50Hz the fundamental wave, and calls those signals whose frequency is an integer multiple of the fundamental wave harmonics. Ideally, there should be no harmonic components in the grid. However, in the actual power grid, due to the existence of various non-linear electrical equipment, such as: electric arc furnace, controllable converter, fluorescent lamp, etc., various interferences are injected into the power grid, resulting in a large number of harmonic signals in the power grid. [0003] With the emphasis on harmonics in various industries, the detection of harmonics in the power grid is also being continuously improved, and ...

AI Technical Summary

Problems solved by technology

Although this measurement method is simple and can obtain relatively high accuracy, it is prone to spectrum leakage problems when the sampling frequency and signal frequency are not synchronized. Therefore, it is also very important to solve the problem of spectrum leakage.

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