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Resistant-type fault current limiter-based hybrid DC power transmission fault processing method

A fault handling method and a technology of hybrid direct current transmission, which are applied to emergency protection circuit devices for limiting overcurrent/overvoltage, power transmission AC networks, circuit devices, etc., can solve problems such as equipment damage and system collapse, and achieve improvement Robustness, slow down the drop speed, improve the effect of DC voltage drop

Active Publication Date: 2019-10-18
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The DC short-circuit fault of the transmission line of the hybrid HVDC transmission system, especially the bipolar ground fault, is a very serious fault. If

Method used

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  • Resistant-type fault current limiter-based hybrid DC power transmission fault processing method
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  • Resistant-type fault current limiter-based hybrid DC power transmission fault processing method

Examples

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Effect test

example 1

[0061] Example 1: The fault start time is t 0 = 3s, the fault location is set at the midpoint of the DC transmission line, the fault resistance (also called transition resistance) is set to 1Ω, and the fault duration is 250ms. The resistance R of the superconducting current limiter on the rectification side SFCLr Set to 20Ω, 40Ω, 60Ω, 80Ω, 100Ω, and the resistance R of the superconducting current limiter on the inverter side SFCLi remain unchanged at 30Ω. The transient behaviors of the LCC converter station and the VSC converter station shown in Fig. 5-6 are obtained.

example 2

[0062] Example 2: The fault start time is t 0 = 3s, the fault location is set at the midpoint of the DC transmission line, the fault resistance (also called transition resistance) is set to 1Ω, and the fault duration is 250ms. The resistance R of the superconducting current limiter on the rectification side SFCLr Keep it constant at 20Ω, while the resistance R of the superconducting current limiter on the inverter side SFCLi Setting 10Ω, 20Ω, 30Ω, 40Ω, 50Ω remains unchanged. The transient behaviors of the LCC converter station and the VSC converter station shown in Fig. 7-8 are obtained.

[0063] Based on the simulation results of the above two examples, the effectiveness of a hybrid DC transmission fault handling method based on a resistive fault current limiter in limiting the DC short-circuit current, slowing down the DC voltage drop at the rectifier side, and improving the DC voltage drop at the inverter side is verified. effectiveness.

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Abstract

The invention relates to a power system and an automatic technology, in particular to a resistant-type fault current limiter-based hybrid DC power transmission fault processing method. Aiming at the technical characteristics of a +/-500kV hybrid high-voltage DC power transmission system, a set of resistant-type fault current limiter is arranged at each of an inlet and an outlet of a power transmission line, the resistant-type fault current limiter is used as a DC fault auxiliary processing method of the hybrid high-voltage DC power transmission system, and converter station control is used asa DC fault main processing method of the hybrid high-voltage DC power transmission system. By the method, the effective DC short-circuit current can be limited, the DC voltage reduction speed of a rectification side is reduced, the DC voltage drop of an inversion side is improved, and the robustness under a DC fault is improved.

Description

technical field [0001] The invention belongs to the field of power systems and automation, and in particular relates to a hybrid direct current transmission fault processing method based on a resistive fault current limiter, which improves the robustness of a ±500kV hybrid high-voltage direct current transmission system under direct current faults. Background technique [0002] Traditional HVDC (High Voltage Direct Voltage, HVDC) technologies include Grid Commutated (Line Commutated Converter, LCC) HVDC technology and Voltage Source Converter (Voltage Source Converter, VSC) HVDC technology. In recent years, hybrid HVDC transmission technology is a new type of realization scheme to achieve the goal of long-distance large-capacity transmission, and has attracted more and more attention from scholars at home and abroad. Hybrid high-voltage direct current transmission technology combines the advantages of LCC-HVDC and VSC-HVDC. Using LCC converter stations as rectifier stations ...

Claims

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Application Information

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IPC IPC(8): H02J3/36H02H9/02
CPCH02J3/36H02H9/02Y02E60/60
Inventor 陈磊李国城张旭阳田昕
Owner WUHAN UNIV