Reactive power measurement method based on digital filtering and measurement system thereof

A technology of digital filtering and power measurement, which is applied in the direction of electric power measurement by applying digital technology, and can solve the problems of long stability time of reactive power measurement method and difficult application of reactive power measurement results to real-time control occasions.

Inactive Publication Date: 2006-07-12
TSINGHUA UNIV
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Problems solved by technology

Due to the above reasons, the stabilization time of existing reactive power measurement methods is long, and the reactive power measurement results are difficult to apply to real-time control occasions such as reactive power compensation.

Method used

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  • Reactive power measurement method based on digital filtering and measurement system thereof
  • Reactive power measurement method based on digital filtering and measurement system thereof
  • Reactive power measurement method based on digital filtering and measurement system thereof

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Embodiment Construction

[0065] The principle block diagram of the embodiment of the present invention is shown in FIG. 2 , and its system configuration is shown in FIG. 3 . With reference to Fig. 2 and Fig. 3, the present invention is based on the working process of the reactive power measurement embodiment of digital phase-shift filtering as follows:

[0066] Step 1: Firstly, a pair of analog voltage signal u(t) and analog current signal i(t) measured from the 50Hz power frequency power grid are respectively set according to the same fixed sampling frequency F S =2000Hz for analog-to-digital conversion to obtain discrete digital voltage signal u(n) and digital current signal i(n). The highest order M of the measured harmonic is 18th, and the corresponding frequency of the highest harmonic is 900Hz. Thus, the selected sampling frequency F S Greater than twice the highest harmonic frequency.

[0067] Step 2: After the digital voltage signal u(n) obtained in the above step 1 passes through two sets ...

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Abstract

The invention relates to a reactive power measurement method based on digital filter, which comprises: first, converting a couple of analog voltage and current signal into digital format; then, treating the signals with four digital phase-shift filters to obtain a couple of phase-shifted voltage signals and current signals; taking calculation and dc filter to the four signals to measure the reactive power data. This invention reduces request to digital phase-shift filter, and has small signal ripple in pure sine or with a little harmonic circuit as well as fast measurement speed.

Description

Technical field: [0001] The invention relates to a reactive power measurement method based on digital filtering. According to a pair of power frequency voltage and current input signals containing harmonics, the method obtains the sum of the fundamental reactive power and the reactive power of each harmonic Total reactive power data. The invention belongs to the technical field of electric parameter measurement. Background technique: [0002] In the power system, reactive power and reactive energy are very important power parameters. The size of reactive power has a great influence on the transmission efficiency and power quality of the power system. By accurately calculating the reactive power of the system, it can Take corresponding measures to distribute and dispatch the reactive power of the power grid, or compensate the reactive load, and suppress the transmission line loss and voltage decline caused by reactive power, so as to achieve the effect of improving power qua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R21/133
Inventor 庞浩王赞基
Owner TSINGHUA UNIV
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