On-line inter-harmonic wave monitoring method and device

A monitoring device and harmonic technology, applied in the field of power system, can solve the problems of low frequency resolution, inability to monitor online, and inaccurate monitoring results.

Active Publication Date: 2019-01-01
CHINA ELECTRIC POWER RES INST +3
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Problems solved by technology

[0005] In order to overcome the shortcomings of inaccurate monitoring results, inability to monitor online, and low frequency resolution in the above-mentioned prior art, the present invention provides an inter-harmonic online monitoring method and device, which firstly performs interpolation processing on the acquired three-phase voltage signals , and then calculate the amplitude of the interpolated voltage in each frequency band, and finally monitor the inter-harmonic based on the amplitude, which not only can realize the online monitoring of the inter-harmonic, but also has high frequency band resolution and accurate monitoring results

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Embodiment 1

[0093] Embodiment 1 of the present invention provides an interharmonic online monitoring method, the specific flow chart is as follows figure 1 As shown, the specific process is as follows:

[0094] S101: Perform interpolation processing on the acquired three-phase voltage signal;

[0095] S102: Calculate the amplitude of the interpolated voltage in each frequency band;

[0096] S103: Monitor inter-harmonics based on the amplitude.

[0097] In the above S101, the acquisition process of the three-phase voltage signal is as follows:

[0098] The three-phase voltage signal and three-phase current signal can be obtained directly by point-by-point sampling and batch reading, or can be obtained from the sampled message by first buffering and then parsing the message. Among them, point-by-point sampling and batch reading are aimed at analog quantity sampling. The sampling frequency band of the corresponding device of the present invention can reach up to 512 points / cycle (25.6kHz)...

Embodiment 2

[0132] Based on the same inventive concept, Embodiment 2 of the present invention also provides an interharmonic online monitoring device, including an interpolation module, a calculation module, and a monitoring module. The functions of the above modules are described in detail below:

[0133] The interpolation module is used to perform interpolation processing on the obtained three-phase voltage signal and three-phase current signal respectively;

[0134] The calculation module is used to calculate the amplitude of the interpolated voltage and current in each frequency band;

[0135] The monitoring module therein is used to monitor the inter-harmonic based on the amplitude.

[0136] The above-mentioned interpolation module includes an acquisition unit, which acquires three-phase voltage signals and three-phase current signals according to the following process:

[0137] Obtain directly by point-by-point sampling and batch reading, or obtain from sampled packets by buffering...

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Abstract

The invention provides an on-line inter-harmonic wave monitoring method and device. The method comprises the following steps: an acquired three-phase voltage signal is interpolated, the amplitude of the interpolated voltage in each frequency band is calculated, and inter-harmonic wave monitoring operation is performed based on the amplitude. On-line inter-harmonic wave monitoring can be realized while high frequency resolution and accurate monitoring results can be achieved. Via the on-line inter-harmonic wave monitoring method and device disclosed in the technical solution provided in the invention, on-line harmonic wave monitoring and on-line inter-harmonic wave monitoring can be realized, harmonic waves and inter-harmonic waves are wide in measurement frequency band, and on-line monitoring of all harmonic waves and inter-harmonic waves in all frequency bands from 0 to 9 kHz can be realized. The on-line inter-harmonic wave monitoring method and device disclosed in the technical solution provided in the present invention can help effectively solve a problem that inter-harmonic wave measurement cannot be achieved currently, guidance and reference are provided for realizing full frequency band monitoring of power grid signals in a scheduling master station, and support is provided for future targeted analysis and control.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to an interharmonic online monitoring method and device. Background technique [0002] At present, the characteristics of power grid signals still focus on high-order harmonic signals, and research on harmonic monitoring and control methods. The application of power quality monitoring devices and reactive power compensation equipment has effectively reduced the harmonic content of the power grid to a certain extent and improved the power supply level of the power grid. However, with the rapid development of UHVDC transmission technology, new energy sources such as wind power and photovoltaics are connected to the power grid on a large scale, and power electronic devices are widely used in power systems, injecting a large number of low-frequency, high-frequency and interharmonic signals into the power grid. The signal of the entire power grid is no longer a pure power frequenc...

Claims

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Application Information

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IPC IPC(8): G01R23/16
CPCG01R23/16
Inventor 樊陈姚建国倪益民袁浩姜玉磊孔涛
Owner CHINA ELECTRIC POWER RES INST
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