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Single-ended adaptive traveling wave ultra-high-speed protection system and method for coping with high-resistance fault

A high-impedance fault and self-adaptive technology, applied in the direction of fault location, emergency protection circuit device, information technology support system, etc., can solve the problems of underutilization, low protection sensitivity, etc., and achieve improved sensitivity, high reliability, high-speed dynamic sexual effect

Active Publication Date: 2020-02-28
XI AN JIAOTONG UNIV +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the essence of these two protection principles is to use the mutation of the electrical quantity to construct the protection, and the full-band information of the fault traveling wave is not fully utilized, so there is a problem of low protection sensitivity when the fault is high transition resistance.

Method used

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  • Single-ended adaptive traveling wave ultra-high-speed protection system and method for coping with high-resistance fault
  • Single-ended adaptive traveling wave ultra-high-speed protection system and method for coping with high-resistance fault
  • Single-ended adaptive traveling wave ultra-high-speed protection system and method for coping with high-resistance fault

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Embodiment Construction

[0048] A single-ended self-adaptive traveling wave ultra-high-speed protection method for high-impedance faults of the present invention comprises the following steps:

[0049] S1. Measure the current and voltage at the installation place of DC transmission line protection, calculate the first traveling wave of zero-mode fault current and take the absolute value;

[0050] Measure the current and voltage at the installation place of the DC transmission line line protection, and calculate the zero-mode current and voltage according to the following formula:

[0051]

[0052] Among them, i p i n , u p , u n are the positive and negative currents and voltages measured at the protection installation site respectively, and the current direction is that the busbar points to the line. And calculate the first traveling wave of zero-mode fault current according to the following formula:

[0053]

[0054] Among them, Z c0 is the zero-mode wave impedance of the transmission li...

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Abstract

The invention discloses a single-ended adaptive traveling wave ultra-high-speed protection system and method for coping with a high-resistance fault. The method comprises the following steps: measuring the current and voltage of a protection installation part of a direct-current transmission line, calculating a first traveling wave of a zero-mode fault current, and taking an absolute value of thefirst traveling wave; carrying out wavelet transform modulus maximum detection on the absolute value of the first traveling wave of the zero-mode fault current, and adaptively changing the length of adata window of protection calculation; constructing a basic fitting function to fit the absolute value of the first traveling wave of the zero-mode fault current according to the expression form of the first traveling wave of the zero-mode fault current to obtain a fitting coefficient; forming a fault data set containing different fault distances and transition resistance faults, and when a faultactually occurs, obtaining a transition resistance estimation interval of the fault according to the position of (bf, af) obtained by fitting the first traveling wave of the zero-mode current in thefault data set; and according to the obtained transition resistance estimation interval, adaptively changing a set value of traveling wave protection, and realizing high-sensitivity discrimination offaults inside and outside the region.

Description

technical field [0001] The invention belongs to the technical field of electric power system relay protection, and in particular relates to a single-end self-adaptive traveling wave ultra-high-speed protection method for high-resistance faults. Background technique [0002] The flexible DC transmission system has small damping and low inertia, and the current rises rapidly after the fault of the DC line, and the fault development process is fast. The flexible DC transmission system requires that the protection system must respond quickly in a short time (several milliseconds). The main protection of DC transmission lines actually put into operation includes traveling wave protection and differential undervoltage protection, among which the traveling wave protection mainly adopts the single-ended traveling wave protection principle of ABB and SIEMENS two companies, and the action time is several milliseconds, which meets the requirements of quick action. sexual demands. How...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02J3/36G01R31/08
CPCG01R31/085G01R31/088H02H7/265H02H7/268H02J3/36Y02E60/60Y04S10/52
Inventor 宋国兵张晨浩王婷赵乐
Owner XI AN JIAOTONG UNIV
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