Subsynchronous/hypersynchronous oscillation on-line monitoring method and device

A monitoring device and super-synchronous technology, applied in the direction of frequency measurement devices, etc., can solve the problems of inability to monitor online, poor real-time performance, and high frequency resolution

Active Publication Date: 2018-12-21
CHINA ELECTRIC POWER RES INST +3
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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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  • Subsynchronous/hypersynchronous oscillation on-line monitoring method and device
  • Subsynchronous/hypersynchronous oscillation on-line monitoring method and device
  • Subsynchronous/hypersynchronous oscillation on-line monitoring method and device

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Embodiment 1

[0100] Embodiment 1 of the present invention provides a sub / supersynchronous oscillation online monitoring method, the specific flow chart is as follows figure 1 As shown, the specific process is as follows:

[0101] S101: Perform interpolation processing on the acquired three-phase current signal;

[0102] S102: Calculate the amplitude of the interpolated current in each frequency band;

[0103] S103: Monitor the sub / supersynchronous 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 three-phase current signal are obtained directly by point-by-point sampling and batch reading, or 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 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 a sub / supersynchronous oscillation online monitoring device, 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 obtained three-phase voltage signal and three-phase current signal respectively;

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

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

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

[0148] Obtain directly by point-by-point s...

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Abstract

The invention provides a subsynchronous / hypersynchronous oscillation on-line monitoring method and device. Firstly, interpolation processing is conducted on acquired three-phase current signals; secondly, amplitudes of a current obtained after interpolation processing at various frequency bands are calculated; and finally, subsynchronous / hypersynchronous oscillation is monitored on the basis of the amplitudes. The subsynchronous / hypersynchronous oscillation on-line monitoring process is short in time and high in real-time performance and frequency resolution. According to the technical scheme,the measurement frequency band range is wide, a current setting value and a subsynchronous / hypersynchronous oscillation current total content percentage setting value can be flexibly set for different application scenes, guidance and reference can be provided for monitoring a dispatching main station, and a support is provided for targeted analysis and control by the dispatching main station.

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 grids, my country has built a super-large-scale complex interconnected power system with the largest population in the world, the widest coverage, the highest level of transmission voltage, and the largest capacity for renewable energy. The links of power supply, power grid and load all present obvious characteristics of power electronics. By the end of 2015, the grid-connected capacity of wind power on the power supply side had reached 129 million kilowatts, and the installed capacity of photovoltaic power generation had reached 43.18 billion, ranking first in the world. In the Northwest and other regions, the installed capacity of new energy power generatio...

Claims

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Application Information

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Patent Type & Authority Applications(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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