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Electric power system wave-recoding file based fault detection method and system
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Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A technology for recording wave files and power systems, applied in directions such as fault locations, and can solve problems such as being unable to feed back power grid status in real time.
Inactive Publication Date: 2013-12-11
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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[0006] The purpose of the present invention is to solve the problem that the existing dispatcher power grid fault assistance system cannot feed back the state of the power grid in real time
Method used
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specific Embodiment approach 1
[0058] Specific implementation mode one, see figure 1 This embodiment will be described. The fault detection method based on the power system recording file described in the present embodiment includes the following steps:
[0059] The wave recording file reading step is used to read the three-phase current signal, three-phase voltagesignal and zero-sequence current signal in the wave recording file;
[0060] The fault type determination step is used to determine the fault type according to the data in the wave recording file;
[0061] The fault situation analysis step is used to obtain the fault situation according to the wave recording data analysis near the fault.
[0062] Include the three-phase current signal I in the wave recording file a , Ib , I c , zero sequence current I 0 , three-phase voltage U a , U b , U c .
specific Embodiment approach 2
[0063] Specific implementation mode two, see figure 2 This embodiment will be described. This embodiment is a further limitation of the fault type determination step in the fault detection method based on the power system recording file described in the specific real-time mode 1. In this embodiment, the fault type determination step further includes the following steps:
[0064] First, judge whether a fault has occurred according to the three-phase current information in the wave recording file;
[0065] If a fault has occurred, further judging whether the fault is a ground fault;
[0066] If it is judged as a ground fault, further judge whether it is a single-phase ground fault;
[0067] If it is judged as a single-phase ground fault, further judge which phase is grounded, and output the judgment result as the fault type judgment result;
[0068] If it is judged as a non-single-phase ground fault, it is judged as a two-phase ground fault, and the judgment result is output...
specific Embodiment approach 3
[0072] Specific Embodiment Three. This embodiment is a further limitation of the fault detection method based on the power system wave recording file described in the second specific real-time mode. In this embodiment, it is judged according to the three-phase current information in the wave recording file whether a fault occurs The method of failure is:
[0073] When the three-phase current in the wave recording file satisfies the formula
[0074] ( | Δ I → a | ≤ ϵ ) ∩ ( | Δ I → b | ≤ ϵ ) ∩ ( | Δ I → ...
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Abstract
The invention discloses an electric powersystem wave-recoding file based fault detection method and system and relates to an electric powersystem fault detection technology. By using the method and system, the problem of non-real time feedback of electrical network states of a conventional dispatcher electrical network fault auxiliary system can be solved. The fault detection method comprises a wave-recoding file reading step, a fault type determining step and a fault situation analyzing step. The fault type determining step comprises: determining a fault according to the three-phase current information in a wave-recoding file and determining whether the fault is a grounding fault, if so, determining whether the grounding fault is a single-phase grounding fault or a two-phase grounding fault, otherwise, determining whether the grounding fault is a three-phase short circuit fault, and if the grounding fault is not the three-phase short circuit fault, determining which two phases are in a two-phase short circuit fault. The fault situation analyzing step involves determining fault situations according to fault states before and after a current abrupt change point and current change states. The method and system provided by the invention can be applied to the modernization operation management of a conventional electrical network.
Description
technical field [0001] The application relates to the fault detection technology of electric power system, and belongs to the technical field of fault detection in electric power system. Background technique [0002] Heilongjiang Power Grid is an important power source base of the Northeast Power Grid. In recent years, with the continuous expansion of power supply scale, the stability of power transmission is very serious. After the Yimu DC Project was put into operation, Heilongjiang Power Grid became a mixed AC and DC power grid. The security and stability control of the power grid is more complicated, and a large number of security and stability control devices are used to ensure the safe operation of the power grid. At present, the safety control device of Heilongjiang power grid has not realized the network connection with the operation information of the provincial power dispatching center. The operation report and abnormal operation information of the device still rel...
Claims
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