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A rectifier station fault area identification method based on station domain information

A technology of fault area and identification method, which is applied in fault location, fault detection according to conductor type, instrument, etc., can solve problems such as DC system outage, DC blocking, etc., achieve high reliability, improve reliability, and have a wide range of applications Effect

Active Publication Date: 2022-01-28
SOUTHWEST JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, according to the current protection strategies and setting methods in actual projects, the two types of faults cannot be distinguished, which may cause unnecessary DC blocking due to asymmetrical faults in the AC system. For example, the "6.23 accident" of Tianguang DC When the AC system is faulty, the DC 100Hz protection malfunctions, resulting in accidental shutdown of the DC system

Method used

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  • A rectifier station fault area identification method based on station domain information
  • A rectifier station fault area identification method based on station domain information
  • A rectifier station fault area identification method based on station domain information

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Embodiment Construction

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0033] A rectification station fault area identification method based on station domain information of the present invention comprises the following steps:

[0034] A. Data collection

[0035] Real-time collection of voltage data at sampling frequency f=10kHz: real-time collection of three-phase voltage signal u at the AC bus of the rectifier station a (t), u b (t), u c (t); real-time acquisition of the voltage u at the head end of the DC line dL (t), where t is the sampling moment.

[0036] B. Data processing

[0037] Calculate the three-phase voltage u of the AC busbar of the rectifier station a (t), u b (t), u c (t) fault component Δu a (t)=u a (t)-u a (t-T), Δu b (t)=u b (t)-u b (t-T), Δu c (t)=u c (t)-u c (t-T); where T represents an AC power frequency cycle.

[0038]Using Fast Fourier Transform to extract the t...

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Abstract

The invention discloses a rectification station fault area identification method based on station domain information, firstly determine the fault time t 0 , and then calculate the amplitude of the negative sequence component of the fundamental frequency of the AC bus voltage and the amplitude of the second harmonic component of the DC line voltage U dL2 (t) at t 0 The incremental integral ratio after the moment, that is, the correlation coefficient λ, is determined by judging λ and the fault identification threshold k set The relationship between realizes the identification of faults in the AC area and DC area of ​​the rectifier station, if λ>k set , then it is judged that the fault occurred is a fault in the AC area of ​​the rectifier station; if λ <kset, it is judged that the fault occurred is a fault in the DC area of ​​the rectifier station. The invention endows the DC 100Hz protection with the ability to identify faults in the AC area and DC area of ​​the rectifier station, is applicable to all high-voltage DC projects, and is not affected by fault types, fault distances, transition resistances, fault initial angles, and noise interference. It has good engineering application prospect.< / k

Description

technical field [0001] The invention belongs to the technical field of rectification station fault identification, and in particular relates to a rectification station fault area identification method based on station domain information. Background technique [0002] With the full implementation of the power grid strategy of "West-to-East Power Transmission, North-to-South Power Transmission", the high-voltage direct current transmission system occupies an increasingly important role in my country's power structure due to its advantages such as large transmission capacity, long transmission distance, and low transmission loss. status. The basic principle of high-voltage direct current transmission is: the electric energy of the power station at the sending end is transmitted to the rectifier station of the high-voltage direct current transmission system through the AC line, and the three-phase alternating current is converted into direct current by the rectifier station, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/085G01R31/088
Inventor 林圣许婷苇牟大林
Owner SOUTHWEST JIAOTONG UNIV
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