A sub/supersynchronous oscillation online monitoring method and device

A super-synchronized, oscillating current technology, applied in frequency measurement devices and other directions, can solve the problems of poor real-time performance, high frequency resolution, short time, etc., and achieve the effect of wide measurement frequency range, high frequency resolution, and strong real-time performance.

Active Publication Date: 2022-06-07
CHINA ELECTRIC POWER RES INST +3
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  • Application Information

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Problems solved by technology

[0006] In order to overcome the deficiencies in the above-mentioned prior art that the monitoring process takes a long time, cannot be monitored online, has poor real-time performance, and low frequency resolution, the present invention provides a method and device for on-line monitoring of sub- / supersynchronous oscillations. First, the acquired three-phase current signals Perform interpolation; then calculate the amplitude of the interpolated current in each frequency band; finally monitor the sub / supersynchronous oscillation based on the amplitude. high frequency resolution

Method used

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  • A sub/supersynchronous oscillation online monitoring method and device
  • A sub/supersynchronous oscillation online monitoring method and device
  • A sub/supersynchronous oscillation online monitoring method and device

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Embodiment 1

[0100] Embodiment 1 of the present invention provides an on-line monitoring method for sub / super synchronous oscillation, and the specific flowchart is as follows figure 1 The specific process is as follows:

[0101] S101: Interpolate the acquired three-phase current signal;

[0102] S102: Calculate the amplitude of the current after interpolation processing in each frequency band;

[0103] S103: Monitor the sub / super synchronous oscillation based on the amplitude.

[0104] In the above S101, the specific process of acquiring the three-phase current signal is as follows:

[0105]The three-phase voltage signal and the three-phase current signal are directly obtained by means of point-by-point sampling and batch reading, or obtained from the sampled messages by means of message buffering and then parsing. Among them, point-by-point sampling and batch reading are aimed at analog sampling. The sampling frequency of the corresponding device of the present invention can reach up ...

Embodiment 2

[0143] Based on the same inventive concept, Embodiment 2 of the present invention also provides an online monitoring device for sub / supersynchronous oscillation, including an interpolation module, a calculation module, and an online monitoring module. The functions of the above modules are described in detail below:

[0144] The interpolation module is used to perform interpolation processing on the acquired three-phase voltage signal and three-phase current signal respectively;

[0145] The calculation module is used to calculate the amplitude of the voltage and current in each frequency band after interpolation;

[0146] The online monitoring module is used for monitoring the sub / super synchronous oscillation based on the amplitude.

[0147] The above-mentioned interpolation module includes an acquisition unit, and the acquisition unit acquires the three-phase voltage signal and the three-phase current signal according to the following process:

[0148] It can be directly o...

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Abstract

The invention provides a method and device for on-line sub / supersynchronous oscillation monitoring. First, interpolation processing is performed on the acquired three-phase current signals; then the amplitudes of the interpolated currents in each frequency band are calculated; finally, based on the amplitudes, the sub / The supersynchronous oscillation is monitored, and the sub / supersynchronous oscillation online monitoring process takes a short time, has strong real-time performance, and has high frequency resolution. The technical solution provided by the invention has a wide range of measurement frequency bands, and the current setting value and the sub / super synchronous oscillation current total content percentage setting value can be flexibly set for different application scenarios, and can provide guidance and reference for the monitoring of the dispatching master station. Provide support for targeted analysis and control.

Description

technical field [0001] The invention relates to the technical field of electric power automation, in particular to an on-line monitoring method and device for sub / super synchronous oscillation. Background technique [0002] With the development and utilization of large-scale renewable energy and the development of smart grid, my country has now built a super-large-scale complex interconnected power system that serves the largest population, covers the widest range, has the highest transmission voltage level, and accommodates the most renewable energy in the world. The power supply, the power grid and the load all show obvious characteristics of power electronics. By the end of 2015, the grid-connected capacity of wind power on the power side reached 129 million kilowatts, and the installed capacity of photovoltaic power generation reached 43.18 million, ranking first in the world. In the northwest and other regions, the installed capacity of new energy power generation accou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/02
CPCG01R23/02Y02E60/00
Inventor 樊陈姚建国倪益民赵国庆任辉孔涛
Owner CHINA ELECTRIC POWER RES INST
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