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Power signal digital filtering method

A technology of digital filtering and power signal, applied in the direction of digital technology network, electrical components, impedance network, etc., can solve the problems of anti-interference ability to be improved, dynamic response and accuracy have no effect, and achieve the effect of improving flexibility

Active Publication Date: 2016-07-13
ZHEJIANG HARNPU POWER TECH
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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

Method used

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Embodiment Construction

[0021] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0022] As a specific example, figure 1 It is a schematic diagram of the processing flow of the present invention, figure 2 As a signal flow diagram, first obtain the protection level sampling value WS1, the sampling fluctuation limit value Wk, the sampling rated value W, the upper limit of the number of consecutive sampling fluctuations exceeding the limit J1, the upper limit of the number of continuous sampling excesses J2, and the measurement level sampling value WS2; then refer to WS1 Analyze each setting parameter, select the appropriate sampling value (protection-level sampling value WS1 or measurement-level sampling value WS2) as the filtering sampling value; then accumulate and average the obtained multiple filtering sampling values ​​to obtain the cumulative average value, as the measured output value. Specifically, see figure 1 and f...

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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...

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Application Information

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IPC IPC(8): H03H17/02
CPCH03H17/0201
Inventor 徐国明周乾陆奇光杨丹萍干晓明
Owner ZHEJIANG HARNPU POWER TECH
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