Alternating current signal collection and automatic calibration method

Abstract

The invention relates to an alternating current signal collection and automatic calibration method. Firstly, a CPLD is utilized for receiving square wave signals generated by collection and shaping of an alternating current collection module hardware frequency measurement loop, the CPLD carries out frequency tracking and calculation on the square wave signals, equally-spaced N pulse signals are output to a DSP in each period according to a measured frequency value, the frequency value is sent to the DSP, and the DSP completes N-point alternating current signal collection of each cycle; then the DSP uses pulse signals received from the CPLD as starting references of alternating current signal collection, the collection of all channel alternating current signals is finished in T / N, and N-point sampling of each alternating current signal is finished in the period T; and finally, automatic calibration is carried out on the collected alternating current signals. The method provided by the invention has the advantages that the collection capacity is large, the remote measurement precision is high, the calibration method is simple, and the expandability and the easy maintenance of the product are greatly improved.

Description

technical field [0001] The invention relates to the field of power system distribution automation, in particular to an AC signal acquisition and automatic calibration method. Background technique [0002] In the field of power system distribution automation, power distribution terminals are required to collect and monitor AC signals in real time. With the continuous increase of urban population and residential density, the concentration of electricity consumption is increasing, and the amount of AC signal collection by corresponding power distribution terminals is increasing; at the same time, there are inconsistencies in the requirements of different sites for telemetry collection capacity. This requires the power distribution terminal to be able to configure the number of telemetry acquisition channels arbitrarily, and to ensure that each channel can correctly collect high-precision raw data. [0003] At present, most of the power distribution terminals are customized acc...

AI Technical Summary

Problems solved by technology

However, this solution has some disadvantages, such as poor scalability, and the capacity of the power distribution terminal cannot meet the demand in real time after the AC signal capacity of the site changes; even if the capacity can be changed, a second calibration is required on site

At the same time, the later AC acquisition module must be used in conjunction with the core unit

When the AC signal acquisition board is damaged, there are many problems such as plug-and-play failure and recalibration.

This solution brings great inconvenience to later equipment maintenance

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