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Reactive power measurement method based on finite impulse response (FIR) digital filter

A digital filter and power measurement technology, which is applied in the direction of electric power measurement by applying digital technology, can solve the problems of decimal point shift, current and voltage signal lead and lag, etc., to achieve accuracy improvement, low implementation cost, and improved The effect of measurement accuracy

Active Publication Date: 2013-02-13
ZHUHAI ZHONGHUI MICROELECTRONICS
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Problems solved by technology

However, there are problems of lead and lag between current and voltage signals, so how to obtain a voltage signal that is sampled synchronously with the current signal is a problem that needs to be solved
In addition, dividing the number of periodic sampling points N by 4 may not happen to be a complete integer value, so it is necessary to propose a solution to solve the problem of moving decimal points

Method used

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  • Reactive power measurement method based on finite impulse response (FIR) digital filter
  • Reactive power measurement method based on finite impulse response (FIR) digital filter
  • Reactive power measurement method based on finite impulse response (FIR) digital filter

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Embodiment Construction

[0027] combine figure 1 and figure 2 As shown, the reactive power measurement method provided in this embodiment is mainly based on the FIR digital filter, and the specific implementation steps are as follows:

[0028] First, there is the sampling step. Specifically, it includes: a pair of analog voltage signal and live wire current signal are measured from the power frequency power grid, and the analog voltage signal and live wire current signal are respectively sampled according to the same sampling frequency (the sampling frequency can be arbitrarily selected according to the accuracy requirements), and then passed The ADC digital-to-analog converter obtains discrete digital voltage signals and digital current signals.

[0029] Second, in order to compensate the phase difference between the voltage and current signals, a voltage signal that is sampled synchronously with the current signal is searched. Firstly, it is judged whether the number of sampling points is an int...

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Abstract

The invention discloses a reactive power measurement method based on a finite impulse response (FIR) digital filter, which mainly comprises the following steps of: sampling data of real-time voltage and current of a live wire; providing transient main frequency and current sampling frequency; correcting phases of a voltage signal and a current signal during calculating reactive power by using an FIR digital filter algorithm, wherein parameters of the FIR digital filer is made into a table in advance and is stored in algorithm sub-modules; acquiring relevant parameters by searching the table during actual correction; and finally calculating to obtain a reactive power value. Compared with the traditional reactive power calculation method, the method has the advantages that measurement precision is improved, implementation stage is simplified, construction cost is low, electric energy metering accuracy is obviously improved, and actual effect is outstanding.

Description

technical field [0001] The invention relates to the technical field of electric energy measurement, in particular to a reactive power measurement method based on an FIR digital filter in an intelligent electric energy meter. Background technique [0002] In electric energy metering equipment, a large number of AC sampling technology based on single-chip microcomputer or special chip for metering are used. These technologies have greatly improved the automation and performance of the equipment. In electronic equipment, reactive power is generally obtained through calculation. Commonly used reactive power calculation methods generally include: ① Indirect calculation based on apparent power and active power ②Based on frequency domain analysis, first calculate the amplitude and phase of fundamental wave and harmonic in voltage and current, and then calculate reactive power; ③Based on time domain integration, it uses instantaneous reactive power (sampling current and synchronous...

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Application Information

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IPC IPC(8): G01R21/133
Inventor 周宣任智仁
Owner ZHUHAI ZHONGHUI MICROELECTRONICS
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