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On-line low-frequency oscillation rapid determination method based on waveform tracking

A technology of low-frequency oscillation and determination method, which is applied in the direction of reducing/preventing power oscillation, spectrum analysis/Fourier analysis, etc., to achieve the effects of shortening the determination time, being easy to obtain, and easy to implement

Inactive Publication Date: 2014-12-03
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this kind of judgment is mainly used for decoupling of out-of-step oscillations, and does not involve online monitoring and suppression of low-frequency oscillations

Method used

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  • On-line low-frequency oscillation rapid determination method based on waveform tracking
  • On-line low-frequency oscillation rapid determination method based on waveform tracking
  • On-line low-frequency oscillation rapid determination method based on waveform tracking

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Embodiment

[0030] Four-machine two-area system such as figure 1 As shown, area I includes generator 1, generator 2, load 1, and load 2. Generators 1 and 2 are connected to the DC rectification side through a transformer, and loads 1 and 2 are connected to the rectification side bus; area II includes generator 3, Generator 4, load 3, load 4, generators 3 and 4 are connected to the DC inverter side through transformers, loads 3 and 4 are connected to the busbar of the inverter side; the two areas are connected by a DC and an AC connection line, and the generator Both include excitation and speed regulation systems. The DC adopts a constant current on the rectifier side and a constant arc-extinguishing angle on the inverter side.

[0031] 1. Realization of judgment

[0032] Through Matlab software, the low-frequency oscillation criterion is realized by programming. Then use the relevant interface to realize the interconnection with the electromagnetic transient simulation software PSCAD, ...

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Abstract

The invention discloses an on-line low-frequency oscillation rapid determination method based on waveform tracking. The method is characterized in that low-frequency oscillation is monitored in real time in an on-line manner through the waveform tracking by use of AC section power signals so as to provide a basis for taking corresponding measures. At the same time, the method is small in computational complexity and short in calculation time, and can help to accurately determine the low-frequency oscillation. Therefore, the method has the advantages of simplicity, rapidness and practicality for an actual system.

Description

technical field [0001] The invention relates to an on-line low-frequency oscillation rapid determination method based on waveform tracking, which belongs to the field of coordinated control of AC and DC transmission. Background technique [0002] The power oscillation phenomenon that occurs between parallel operating units in the power system after being disturbed is called low-frequency oscillation, and its oscillation frequency is generally between 0.2Hz and 2.5Hz. The mechanism of low-frequency oscillation is that under certain circumstances, the negative damping effect provided by the system offsets the positive damping of the system generator, field winding and mechanical aspects, so that the total damping of the system is very small (weak damping) or negative damping. However, when the system is disturbed under the condition of negative damping, the disturbance will be gradually amplified, which will cause low-frequency oscillation of the power, and in severe cases, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24G01R23/16
Inventor 李兴源李保宏赵睿刘天琪王渝红张英敏赵兵胡涛
Owner SICHUAN UNIV
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