Automatic time compensation correction method and synchronous sampling universal module

Abstract

The invention discloses an automatic time compensation correction method and a synchronous sampling universal module. The method comprises steps of reserving a sampling channel L0 in a digital-to-analog conversion chip, dividing a debugging analog signal into two paths, and connecting two paths to a conditioning filter circuit channel L1 and the channel L0 of the digital-to-analog conversion chip; the sampling point time Tn0 and the sampling point time Tn1 of the channel L0 and the channel L1 being obtained; tn1-Tn0 is a time error value of the analog signal conditioning filter circuit, digital-to-analog conversion acquisition of channels L1 to L8 is completed, total time Ts1 is recorded, a channel L0 is added for secondary digital-to-analog conversion reading, and the total time of digital-to-analog conversion acquisition is Ts2; and Ts2-Ts1 is a single-channel digital-to-analog conversion time error. The universal module comprises a control module, a time synchronization module, a clock module, a sampling module, a power supply module and an interface module, inherent time error correction is carried out in the time synchronization module, time compensation is carried out in the sampling module by utilizing an automatic time compensation correction method, synchronous sampling precision is high, and applicability is wide.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to an automatic time compensation correction method and a synchronous sampling universal module. Background technique [0002] In the primary and secondary equipment of power distribution, the time synchronization between the primary equipment and the secondary equipment, and the high-precision sampling synchronization between the secondary equipment are of great significance to improve the fault perception, analysis, and processing capabilities of the distribution network. Most of the line faults in the distribution network are single-phase ground faults. The fault judgment method is to use the zero-sequence voltage mutation on the bus side as the starting element, and to synthesize the zero-sequence current from the current waveform collected by the terminal device on the line at the same time. Waveform, use related algorithms to realize fault judgment and location, whic...

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Problems solved by technology

[0003] At present, most of the terminal devices used on the distribution network come from different manufacturers, which are relatively scattered and have certain technical fortresses, and the time errors on the terminals are all different, and the level of the manufacturers is uneven, because the synchronous acquisition, signal processing, etc. There is a certain error, which brings difficulty to the realization of fault judgment technology relying on zero-sequence voltage and current

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