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DC line fault protection method utilizing current converter active injection and traveling-wave coupling

A DC line fault and traveling wave coupling technology, which is applied to emergency protection circuit devices, power transmission AC networks, electrical components, etc., can solve problems such as increased power system swing range, reduced service life, and reduced circuit breaker insulation. Ensure safe and reliable operation, reduce impact, and achieve high sampling rate requirements

Active Publication Date: 2018-09-18
XI AN JIAOTONG UNIV +2
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AI Technical Summary

Problems solved by technology

[0003] When the traditional AC automatic recloser blindly recloses on a permanent fault, the power system will suffer two consecutive fault impacts in a short period of time, especially the three-phase reclosing on a permanent fault between phases, resulting in an increase in the swing of the power system after reclosure, reducing the Insulate electrical equipment such as circuit breakers and reduce their service life

Method used

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  • DC line fault protection method utilizing current converter active injection and traveling-wave coupling
  • DC line fault protection method utilizing current converter active injection and traveling-wave coupling
  • DC line fault protection method utilizing current converter active injection and traveling-wave coupling

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Embodiment Construction

[0039] The DC line fault protection method of active injection and traveling wave coupling of the converter is further described below in conjunction with the accompanying drawings:

[0040] The purpose of the present invention is to provide a DC line fault protection method utilizing active injection and traveling wave coupling of a converter. In the present invention, when a unipolar fault occurs on a DC transmission line, and the fault is cleared or isolated, the characteristic signal is injected into the healthy pole DC line through the MMC additional control strategy of the healthy pole. Due to the coupling of the electric quantity between the transmission lines, the faulty pole line will be induced The corresponding characteristic signal is used to judge the nature of the fault by using the difference in the propagation characteristics of the faulty pole characteristic signal when the line fault exists and disappears. This invention is of great significance to the improve...

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Abstract

The invention discloses a DC line fault protection method utilizing current converter active injection and traveling-wave coupling. The DC line fault protection method comprises the steps of utilizinga health pole current converter additional control strategy to inject a feature signal into a DC line within an interval after fault pole DC line fault clearing / isolation and before current converterrestarting / reclosing of a DC power transmission system, wherein propagation properties of the feature signal are different when a DC line fault exists and disappears, utilizing the difference to realize fault property determination of the DC fault line, and further controlling a fault pole power transmission system not to restart / reclose a circuit breaker, thereby realizing DC line fault protection. The DC line fault protection method realizes self-adaptive restarting / reclosing of the DC system in an overhead line power transmission occasion, shortens the power outage duration, ensures the safe and reliable operation of the DC system, and has remarkable direct benefits and indirect benefits.

Description

technical field [0001] The invention belongs to the field of DC line fault protection, and in particular relates to a DC line fault protection method utilizing converter active injection and traveling wave coupling. Background technique [0002] As the component with the largest coverage area and the worst working conditions, the transmission line has the highest failure rate among all the equipment in the power system. The line fault has the characteristics of single phase (pole) and instantaneous. After the line fault is removed, the probability of successful reclosing within a fixed time limit is 60% to 90%. The higher the voltage level, the higher the reclosing power. Therefore, the application of reclosing / restarting technology is very important to improve the stability and continuity of power supply of the power system dominated by overhead lines. [0003] When the traditional AC automatic recloser blindly recloses on a permanent fault, the power system will suffer tw...

Claims

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Application Information

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IPC IPC(8): H02H7/26H02J3/36
CPCY02E60/60H02H7/268H02H7/265H02J3/36
Inventor 宋国兵王婷张晨浩吴磊韩伟李程昊
Owner XI AN JIAOTONG UNIV
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