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Fault detection method and device for lcc-mmc hybrid three-terminal direct current transmission system

A technology for DC transmission system and fault detection, which is applied to measurement devices, fault locations, and fault detection according to conductor types, etc., can solve the problem of inability to accurately locate faults in hybrid three-terminal DC transmission systems, and achieve fast fault detection time and meet the speed requirements. The effect of dynamic requirements, strong resistance to transition resistance and anti-interference ability

Active Publication Date: 2021-03-09
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +2
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Problems solved by technology

[0006] The present invention solves the problem in the prior art that the failure of the hybrid three-terminal direct current transmission system cannot be accurately located after a failure at both ends of the converter station, thereby providing a fault detection method, device, computer equipment and storage medium for the hybrid three-terminal direct current transmission system

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  • Fault detection method and device for lcc-mmc hybrid three-terminal direct current transmission system
  • Fault detection method and device for lcc-mmc hybrid three-terminal direct current transmission system
  • Fault detection method and device for lcc-mmc hybrid three-terminal direct current transmission system

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Embodiment Construction

[0029] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0030] In the description of the present invention, it should be noted that the terms "first", "second", and "third" are used for description purposes only, and should not be understood as indicating or implying relative importance.

[0031] In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as there is no conflict with each other.

[0032] figure 1 It is a topology diagram of a hybrid three-terminal DC tra...

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Abstract

The invention discloses a fault detection method, device, computer equipment and storage medium of a hybrid three-terminal direct current transmission system. The invention utilizes the difference of the voltage change rate under faults inside and outside the zone to judge the fault location; utilizes the positive and negative voltage change rate Differentially constructed fault pole selection criteria, so as to quickly and selectively isolate faults, ensure the normal operation of non-faulty parts, and improve operational safety and power supply reliability. By analyzing the difference of voltage characteristics on both sides of the converter station when faults occur in different areas, the fault area identification criterion is constructed, so as to realize the identification of faults in different areas, and switch the converters on both sides of the line to zero current control mode , and issue a breaking command to the responding isolating switch.

Description

technical field [0001] The invention relates to the technical field of hybrid direct current transmission systems, in particular to a fault detection method, device, computer equipment and storage medium for a hybrid three-terminal direct current transmission system. Background technique [0002] With the grid-commutated converter-based high-voltage direct current transmission system (Line Commutated Converter-Based High Voltage Direct Current, LCC-HVDC) has obtained a large number of engineering practices in long-distance large-capacity power transmission occasions. At present, my country has put into operation Yunguang, Northwest Yunnan, Xiangjiaba-Shanghai and other 13 UHV DC transmission projects and several HVDC transmission projects. However, the LCC-HVDC inverter station has defects such as commutation failure, inability to supply power to the weak AC system, and the need to consume a large amount of reactive power during operation, which makes the risk of safe and st...

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 韩伟刘磊马伟东刘超李程昊杨睿璋孙仕达宋闯李琼林党一奇段文岩向往文劲宇
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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