A high-precision voltage non-intrusive measurement method and device based on dual-frequency injection

By injecting dual-frequency signals into the measurement circuit and performing signal separation and calculation, the problem of insufficient accuracy of single-frequency signals is solved, and high-precision voltage detection is achieved.

CN117214504BActive Publication Date: 2026-06-09SOUTHERN POWER GRID DIGITAL GRID RESEARCH INSTITUTE CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SOUTHERN POWER GRID DIGITAL GRID RESEARCH INSTITUTE CO LTD
Filing Date
2023-09-19
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

In existing non-invasive voltage measurement methods, the ability of a single reference signal to identify key parameters of the measurement circuit is not strong, resulting in insufficient voltage detection accuracy and an inability to effectively cope with the variability of voltage, current and other parameters in high-voltage power grids.

Method used

A dual-frequency injection method is adopted, which injects two detection signals of different frequencies into the measurement circuit. The detection current is obtained through signal separation and Fourier transform. The voltage to be measured is calculated by combining the rated current and the detection voltage, thereby canceling the influence of resistance and inductance in the measurement circuit.

Benefits of technology

It improves the accuracy of voltage detection and can effectively counteract the effects of resistance and inductance in the measurement circuit, thus achieving high-precision voltage measurement.

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Abstract

This application relates to a high-precision non-invasive voltage measurement method, apparatus, computer device, and storage medium based on dual-frequency injection. The method includes: injecting a first detection signal and a second detection signal into a measurement circuit; acquiring a displacement current signal in the measurement circuit; performing signal separation on the displacement current signal based on the signal frequency to obtain a first detection current, a second detection current, and a rated current; and determining the voltage to be measured based on the rated current, the detection voltage, the first detection current, and the second detection current. By injecting the first and second detection signals into the measurement circuit, and obtaining the first detection current, the second detection current, and the rated current based on the obtained displacement current signal, the voltage to be measured is finally determined using the rated current, the detection voltage, the first detection current, and the second detection current. By injecting two reference signals of different frequencies, the influence of resistance and inductance in the measurement circuit can be effectively offset, thereby improving the accuracy of voltage detection.
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