Power line fault point positioning method based on instantaneous phase consistency

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,...

AI Technical Summary

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.

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