Periodic waveform sampling data compression system and method for electric power system

Abstract

The present invention relates to a compression system and method for electrical power system periodic waveform synchronous sampling data, wherein the system comprises a synchronous sampling unit, a comparator, a synchronous frequency doubling unit, a time-mark generator, a data-processing unit and a encode unit; the method comprises the following steps: 1. convert periodic signal to square wave signal through the comparator; 2. generate synchronous sampling pulse through the synchronous frequency doubling unit and the synchronous sampling unit performs synchronous digifax conversion under synchronization of synchronous sampling pulse and inputs convertion result into the data-processing unit, meanwhile, the time-mark generator records start moment of each frequency current and input time mark into the data-processing unit; 3. preliminary treatment to information through the data-processing unit; 4. encode to form a compressed file through the encode unit. The present invention performs preliminary treatment to sampled data before encode, enhances compression ratio, realizes high sampling frequency, overcomes influence to non-integer-period sampling, and improves data consistency.

Description

【Technical field】 [0001] The invention relates to a data compression technology in a power system, in particular to a system and method for synchronously sampling data of periodic waveforms in a power system. 【Background technique】 [0002] The power system wave recording device is divided into two recording methods: threshold trigger recording and continuous recording. Among them, the threshold-triggered recording method only records the pre-fault and post-fault data when the calculated data exceeds the set threshold, and cannot comprehensively record the effective information of the power system. The reason is that the main purpose of the preset trigger value is to predict the possible There is a risk that the trigger value is set to accurately capture the event that occurs. In many cases, the data when the power failure occurs is not recorded because the trigger is set incorrectly or the storage space is insufficient. As for the continuous recording method, the sampling ...

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Problems solved by technology

[0003] In order to solve the technical problem in the threshold trigger recording method existing in the prior art that the data when the power failure occurs is not recorded because the trigger setting is wrong or the storage space is not enough, and the continuous recording method is limited by the storage capacity. Due to the technical problem that the sampling rate cannot be too high, the present invention provides a periodic waveform synchronous sampling data compression system for power systems

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