Power line fault point positioning method based on instantaneous phase consistency

A technology of instantaneous phase and positioning method, which is applied to fault location, fault detection according to conductor type, and electrical measurement, etc., which can solve problems such as difficult handling of transient data

Pending Publication Date: 2021-04-23
STATE GRID CHONGQING ELECTRIC POWER +2
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Problems solved by technology

However, the existing common fault analysis methods mostly use double-ended or single-ended power frequency fault components and concentrated line parameters, which cannot fundamentally avoid the influence of transition resistance
In addition, due to the existence of a large number of power electronic devices in the power grid, during the fault transient process of the power grid, the current magnitude and phase are related to the control mode and current limiting measures of the power electronic devices. The traditional fault analysis method is not easy to deal with the transient data in a short window.

Method used

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  • Power line fault point positioning method based on instantaneous phase consistency
  • Power line fault point positioning method based on instantaneous phase consistency
  • Power line fault point positioning method based on instantaneous phase consistency

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Embodiment Construction

[0012] Hereinafter, a method for locating a power line fault point based on instantaneous phase consistency according to the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0013] figure 1 A distribution diagram of fault points to be determined in an exemplary embodiment of the method for locating fault points of power lines based on instantaneous phase consistency of the present invention is shown. figure 2 A schematic diagram of a phase A single-phase ground fault of an exemplary embodiment of the method for locating a fault point of a power line based on instantaneous phase consistency in the present invention is shown. image 3 A schematic diagram of a two-phase short-circuit fault of B and C of an exemplary embodiment of the method for locating a fault point of a power line based on instantaneous phase consistency of the present invention is shown. Figure 4 A schematic diagram of a two-phase ground ...

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Abstract

The invention provides a power line fault point positioning method based on instantaneous phase consistency. The method comprises the following steps: determining a search step length, and generating a plurality of to-be-determined fault points in a fault circuit; based on the transient voltage and current instantaneous phase consistency on the short-circuit transition resistor, for different line fault types, respectively establishing constraint relationships of the voltage and current instantaneous phase consistency on the transition resistor; and calculating the voltage and current instantaneous phase consistency on the transition resistance of each to-be-determined fault point one by one, wherein the to-be-determined fault point with the highest consistency is the determined fault point. According to the positioning method, the power line fault points can be positioned layer by layer, the positioning method is effective and reliable, and the simple short-circuit fault of the power electronic power grid can be accurately positioned.

Description

technical field [0001] The invention relates to the field of electrical engineering, in particular to a method for locating fault points of power lines based on instantaneous phase consistency. Background technique [0002] The power line is one of the most important components in the power system, shouldering the heavy responsibility of transmitting and distributing electric energy, and at the same time, it is the link with the most concentrated faults in the power system. With the increasingly complex structure of the power system and the increasing uncertainties in the operation of the power grid, the difficulty of locating the fault point of the power line is also gradually increasing. The existing fault location methods of power lines mainly include traveling wave method and fault analysis method. However, the traveling wave method has high requirements on the sampling rate of the device, and is easily affected by the network structure, bus connection mode, fault type,...

Claims

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Application Information

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IPC IPC(8): G01R31/08G01R31/52G01R31/58
CPCG01R31/085G01R31/52G01R31/58Y04S10/52
Inventor 张捷罗建何建军谢兵肖波张洪涛吴松麟朱彬杨凌周玉宇李怀政吕培庚韦嘉唐启军刘蕾余渌绿曾彦珺杨帆康宇轩邹刚尹颢涵秦涛王珊龙文谢清宇刘海龙
Owner STATE GRID CHONGQING ELECTRIC POWER
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