A regional power grid fault location method based on node fault domain time difference method
A regional power grid and fault location technology, applied in the fault location, detecting faults by conductor type, measuring electricity and other directions, can solve the problems of line exit fault location dead zone, location device fault, increase the cost of the ranging system, etc., to improve the location Accuracy, precise positioning, and the effect of reducing equipment investment costs
Active Publication Date: 2021-09-21
CHINA THREE GORGES UNIV
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Problems solved by technology
For complex power networks, the local traveling wave positioning method is aimed at a single line, using the traveling wave measurement data at both ends of the line respectively. The principle is simple, but the failure of the positioning device and the wrong time record will lead to positioning failure and increase the cost of the ranging system
The network-type traveling wave location method integrates the multi-point traveling wave measurement data of the regional power grid to achieve accurate fault location. However, the large regional power grid has difficulty in solving the complex ring network, and there is a dead zone in the location of the fault at the line outlet, and it is affected by the instability of the traveling wave velocity, etc. factors
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[0099] like Figure 8 As shown, a regional power grid fault location method of a node fault domain time difference method provided by the present invention, for the convenience of description, in the specific implementation mode, a certain regional power grid model is taken as an example, as Figure 9 shown. The specific implementation of the regional power grid fault location method includes the following steps:
[0100] Step 1: Facing the high-voltage regional power grid, the configured traveling wave location unit divides the node fault domain according to the shortest path of the Dijkstra algorithm, as shown in Table 1.
[0101] Table 1 Node fault domain
[0102] node node failure domain S 2
S 1-2 , S 2-3 , S 3-4 , S 3-6 , S 2-5
S 5
S 2-5 , S 5-8 , S 6-8 , S 8-9
S 6
S 3-6 , S 4-7 , S 6-7 , S 6-8 , S 6-9 , S 7-10
S 9
S 6-9 , S 8-9 , S 9-10 , S 9-11 , S 7-10 , S 10-12
S 13...
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A regional power grid fault location method based on the node fault domain time difference method. The method is oriented to high-voltage regional power grids. The configured traveling wave positioning unit divides the node fault domain according to the shortest path of the Dijkstra algorithm, and establishes a fault location that belongs to a single node fault domain. pre-criteria. Based on the analysis of the fault traveling wave transmission path of the complex ring network, the information domain time difference and fault branch search matrix based on the expected value and actual value centered on the node domain are constructed, and on this basis, the terminal line, common line and ring domain line are proposed. Faulty branch category identification criterion; further realize faulty branch discrimination based on matrix search. Finally, for different types of fault branches, the single / multi-terminal traveling wave location method is combined to realize the accurate calculation of the fault location. The method of the invention only needs to calculate the time difference relationship between the central substation and other detection units, does not need to solve the ring, has a small amount of calculation, is easy to implement in engineering, and has high positioning accuracy.
Description
technical field [0001] The invention discloses a regional power grid fault location method based on the node fault domain time difference method, and relates to the technical field of power system fault investigation. Background technique [0002] At present, with the rapid development of communication technology and computer, the number of traveling wave positioning units installed in the power grid has increased significantly, and regional networking has been realized and applied in practice. Combining the action information of relay protection and using the traveling wave information of the whole network, the positioning accuracy and reliability of the existing fault location method can be further improved. [0003] Existing traveling wave fault location methods mainly include local traveling wave location method based on single-ended measurement data and network type traveling wave location method based on multi-point measurement data of regional power grid. For complex...
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IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088Y04S10/52
Inventor 李振兴谢志豪程宜兴李成志李振华翁汉琍黄景光
Owner CHINA THREE GORGES UNIV