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Complex power grid fault location method based on wide-area travelling wave energy and time difference

A power grid fault and positioning method technology, which is applied in the direction of fault location, measurement of electricity, and measurement of electrical variables, can solve the problems of the influence of double-terminal ranging results and the difficulty of fault location and judgment, and achieve good practical value, strong economy, and fast The effect of positioning

Inactive Publication Date: 2017-05-31
CHINA UNIV OF MINING & TECH
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Problems solved by technology

[0003] Although the time-difference-based double-terminal ranging method is one of the main methods of traveling wave ranging, for relatively large wide-area networks and large information redundancy, only the physical quantity of time is used for fault location and measurement. distance, there will be some difficulties in fault location judgment
In the process of precise fault ranging, a large amount of redundant information will also be faced, and in the case of large errors in GPS synchronization, if it is not screened, the result of double-ended ranging will be greatly affected

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  • Complex power grid fault location method based on wide-area travelling wave energy and time difference
  • Complex power grid fault location method based on wide-area travelling wave energy and time difference
  • Complex power grid fault location method based on wide-area travelling wave energy and time difference

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[0035] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0036] A complex power grid fault location method based on wide-area traveling wave energy and time difference, such as figure 1 As shown, the specific process is as follows:

[0037] Step 1: For a complex power grid whose topology is determined, its original topology is denoted as P 1 , there are a total of N substations in the grid, denoted as B 1 ,B 2 ,...,B N , each substation needs to install a traveling wave recording device with a three-phase line current traveling wave monitoring module, and a fault location master station is installed in the central control room.

[0038] Step 2: When the system fails, the wave recording devices at each site are activated to record the fault signal. The sampling frequency is 10kHz, and the recorded fault time window length is 7 power frequency cycles, which are 3 power frequency cycles before ...

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Abstract

The invention discloses a complex power grid fault location method based on wide-area travelling wave energy and time difference. According to the fault location method, by starting from travelling wave energy generated after failure of a power grid, the influence of line length and bus out-degree on the attenuation of travelling wave energy in the process of transmission in the power grid is analyzed, the three-phase current of each substation after failure is measured, the magnitude of travelling wave energy of each substation is calculated, and thus, a fault section and a fault point are determined. A lot of existing equipment is used in the method. The method requires low real-time performance of data sampling, and is easy to implement. Through analysis of a simulation model built according to actual parameters, the method is not affected by fault phase angle and fault resistance, and is of high accuracy and robustness. The positioning method of the invention is suitable for application in a complex power grid.

Description

technical field [0001] The invention belongs to the technical field of power grid monitoring, and in particular relates to a complex power grid fault location method based on wide-area traveling wave energy and time difference. Background technique [0002] Quickly and accurately locating the fault location is one of the primary problems to be solved in the modern power system wide area network. Since the GPS (Global Positioning System) has been widely used in the engineering industry, the high-precision clock positioning synchronization function has made the traveling wave ranging technology develop rapidly. Among them, the double-terminal ranging method based on time difference has become one of the important means of traveling wave ranging due to its good applicability, high precision and good robustness. In the wide-area network, the number of substations is large, so there is redundancy in the information collected when a fault occurs. How to make full use of these fa...

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088Y04S10/52
Inventor 梁睿刘成磊马凌峰李意谢添聂鹏飞彭楠吴胜磊温颖陈培阳
Owner CHINA UNIV OF MINING & TECH
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