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A visual monitoring method for low frequency oscillation of power grid based on s-transform

A low-frequency oscillation and power grid technology, applied in the measurement of electricity, measurement devices, and measurement of electrical variables, etc., can solve the problem that it is difficult for dispatchers to quickly analyze the oscillation pattern from the oscillation waveform, unable to judge the number of oscillation modes, and difficult to determine the dominant oscillation mode. frequency etc.

Active Publication Date: 2016-06-08
POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD
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Problems solved by technology

There are two main problems in this method of manual real-time monitoring of low-frequency oscillations: one is that the number of oscillation modes cannot be judged, and low-frequency oscillations may only contain one oscillation mode, or may be the result of multiple oscillation modes; It is difficult to determine the dominant frequency corresponding to the oscillation mode
It is often difficult for experienced dispatchers to quickly analyze the oscillation mode and its corresponding frequency directly using the oscillation waveform

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  • A visual monitoring method for low frequency oscillation of power grid based on s-transform
  • A visual monitoring method for low frequency oscillation of power grid based on s-transform
  • A visual monitoring method for low frequency oscillation of power grid based on s-transform

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Embodiment Construction

[0065] The visual monitoring method for low-frequency oscillation of the power grid of the present invention is applied in Guangdong Power Grid Corporation, and the specific implementation process is as follows figure 1 shown.

[0066] The implementation case analysis is carried out in combination with the measured data of the low-frequency oscillation event that occurs in a certain line of the Guangdong Power Grid Company. The steps of the embodiment of the present invention are as follows:

[0067] S1) Collect PMU active power data in real time

[0068] The PMU collects data every 20ms, marks it with a time stamp and uploads it to the dispatch center. The historical data of the active power measured by the PMU are as follows: figure 2 Take the data window with a length of 20.46s and move forward Δt=20ms every 20ms; the change of the PMU data window with the passage of time is shown in Figure 3, the sampling time interval T=0.02s, and the number of sampling points N=1024; ...

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Abstract

An S-transformation based power grid low-frequency oscillation visualization monitoring method is characterized by comprising the following steps of (S1) acquiring PMU active power data in real time; (S2) utilizing S-transformation to process active power data acquired by a PMU; (S3) separating out modular matrixes of F-matrixes, wherein the modular matrixes are denoted as A=(ajk) M*N, and the requirement ajk = / rjk / is met; (S4) utilizing the data of the matrixes A to draw two-dimensional time-frequency graphs and forwards pushing a data window to update images at intervals of delta t =20ms. By means of the S-transformation based power grid low-frequency oscillation visualization monitoring method, the two-dimensional time-frequency drawings of oscillation graphs can be drawn for reference of a dispatcher, the graphs dynamically and visually show the frequency of oscillation signals and real-time information of amplitude values, and the dispatcher can conveniently, simply, accurately and quickly conduct real-time monitoring on low-frequency oscillation. In addition, the S-transformation based power grid low-frequency oscillation visualization monitoring method further facilitates shortening of calculation time.

Description

technical field [0001] The invention relates to a visualized real-time monitoring method for low-frequency oscillation of a power grid, in particular to a visualized real-time monitoring method for low-frequency oscillation of a power grid based on S-transformation. Background technique [0002] With the continuous expansion of the power system and the increase of large-scale power system interconnection, the structure and characteristics of the power system are becoming more and more complex, and the problem of low frequency oscillation is becoming increasingly prominent. The low frequency oscillation of the power system affects the safe and stable operation of the system. The real-time monitoring of low-frequency oscillation of the power grid can provide a basis for rationally arranging the operation mode of the power grid, which is an important prerequisite for avoiding the occurrence of low-frequency oscillation and improving the security and stability of the power grid....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
Inventor 李世明温柏坚郭文鑫向德军余志文王彬林玥廷池丽娟
Owner POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD
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