A Digital Filtering Method for Power Signal

Abstract

The invention discloses a power signal digital filtering method comprising the following steps: S1, acquiring a protection-level sampling value WS1, a sampling fluctuation limit value Wk, a sampling rated value W, a sampling fluctuation continuous over-limit number-of-times upper limit J1, a sampling continuous excess number-of-times upper limit J2, and a measurement-level sampling value WS2; S2, analyzing the protection-level sampling value WS1, counting sampling fluctuations and sample excesses based on parameters given in S1 to filter out accidental interference, and selecting the protection-level sampling value WS1 or the measurement-level sampling value WS2 as the current filtering sampling value according to the result of analysis; and S3, accumulating and averaging the filtering sampling values acquired in S2 to get an accumulative average, and taking the accumulative average as a measurement output value.

Description

technical field [0001] The invention relates to a power signal processing technology in a power system, in particular to a power signal digital filtering method with measurement-level accuracy and protection-level dynamic range. Background technique [0002] With the continuous development of modern industry, the demand for power is increasing, and the stability of power transmission is becoming more and more important. People put forward higher requirements for the measurement accuracy, response time and interference filtering of power signal monitoring. [0003] The digital filtering mentioned in the present invention is mainly aimed at the processing of signal sampling values ​​in the power system before output. Generally speaking, in the transmission and output of power signals, equal emphasis on system stability, measurement accuracy, response time and interference filtering is the core and difficult point to be solved at present. In the general digital filtering of po...

AI Technical Summary

Problems solved by technology

In the general digital filtering of power signals, after the electrical signal is converted into sampled values ​​by the sampling circuit, the sampled values ​​converted N times in a row form a sampled value queue, and the sampled value queue is accumulated and averaged, and the calculated value is compared to the last output The fluctuation of the value is equally divided into The fluctuation range is averaged, but it has no effect on the dynamic response and accuracy of the measurement output, and the anti-interference ability needs to be improved

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