Method for positioning fault disturbance point in power grid

A technology of fault disturbance and positioning method, which is applied in the direction of fault location, measurement of electrical variables, measurement of current/voltage, etc., and can solve the problems of adding traveling wave fault location network functions, single installation and maintenance costs, etc.

Inactive Publication Date: 2012-05-02
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for locating fault disturbance points in the power grid, which is used to increase the function of the current PMU device for fault disturbance location and solve the problems of single function of traveling wave fault location network and high installation and maintenance costs

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  • Method for positioning fault disturbance point in power grid
  • Method for positioning fault disturbance point in power grid
  • Method for positioning fault disturbance point in power grid

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Embodiment

[0038] Because the present invention requires the PMU measurement device to collect the relevant data of any phase voltage and phase current in each power frequency cycle of each node, we will take the relevant data of phase A phase voltage and phase current as an example for specific description.

[0039] figure 1 is the flow chart of the location method of the fault disturbance point in the power grid, figure 1 Among them, the location method of the fault disturbance point in the power grid provided by the present invention includes:

[0040] Step 1: Preprocess all PMU devices with GPS time scales so that they produce the same filter phase lag for signals at a set frequency.

[0041] The purpose of preprocessing the PMU devices with GPS time scales is to avoid errors in the time points corresponding to the extreme values ​​measured by each PMU device. Generally, the preprocessing of the PMU device with GPS time scale is to use the filter with the same cut-off frequency on ...

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Abstract

The invention discloses a method for positioning a fault disturbance point in a power grid in the technical field of power system measurement and control. The method comprises the following steps of: preprocessing all PMU (Power Management Unit) devices with GPS (Global Position System) time marks; measuring a maximum value of phase voltage, a minimum value of phase voltage, a maximum value of phase current, a minimum value of phase current and corresponding moments corresponding to the maximum and minimal values of the phase voltage and the phase current in any one phase in each power frequency cycle of each node, and sending the measurement data to a power grid control center; judging if the fault disturbance is caused in the power grid by the power grid control center according to the received measurement data, and calculating active power and reactive power of each node when the fault disturbance is not generated in the power grid; otherwise, extracting a voltage disturbance quantity curve of each node, and judging the type of the fault disturbance, and determining the position of the fault disturbance point according to the type of the fault disturbance. The method solves theproblems on calculation of the active power and the reactive power in the stable running state of the power grid, judgment of the type of the fault disturbance in the power grid and positioning of the fault disturbance in the power grid.

Description

technical field [0001] The invention belongs to the technical field of power system measurement and control, and in particular relates to a method for locating fault disturbance points in a power grid. Background technique [0002] Due to the large scale of transmission lines in the power system, the vast area covered by the grid structure, the aging of equipment and the influence of extreme weather factors, various forms of fault disturbances will occur in the power grid. For example: different types of short-circuit faults will occur on the line; the low-frequency oscillation of a certain generator will cause the low-frequency oscillation problem of the entire grid. When the above types of fault disturbances occur in the power grid, how to quickly and automatically determine the location of the fault disturbance point is of great significance for formulating operation and control measures after the power grid fault disturbance to ensure the safe and stable operation of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R19/165
CPCY02E60/728Y04S10/265Y04S10/522Y02E60/00Y04S10/00Y04S10/52Y04S10/22Y02E40/70
Inventor 董清颜湘武
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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