An AC/DC fault identification and protection coordination method in a converter station

A DC fault and coordination method technology, applied in emergency protection circuit devices, power transmission AC networks, electrical components, etc., can solve the problems of disappearance of fault characteristics, failure to comprehensively consider the protection scheme of AC and DC fault characteristics and the coordination of fixed values

Active Publication Date: 2018-12-18
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

However, for DC protection, when the delay time is long, there may be cases where the fault feature disappears due to reasons such as converter blocking
Moreover, most of the existing AC and DC protections do not comprehensively consider the characteristics of AC and DC faults and the coordination of protection schemes and fixed values, and the function of determining the fault area still needs to be improved.

Method used

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  • An AC/DC fault identification and protection coordination method in a converter station
  • An AC/DC fault identification and protection coordination method in a converter station
  • An AC/DC fault identification and protection coordination method in a converter station

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Embodiment Construction

[0052] The present invention provides an AC / DC fault identification and protection coordination method in a converter station. The present invention will be specifically described below in conjunction with the accompanying drawings.

[0053] On the basis of analyzing the characteristics of the AC and DC faults, the present invention proposes the differential current protection of the converter station for distinguishing the AC and DC faults of the converter station and the cooperation scheme of the AC and DC protection of the converter station; mainly from: 1) analysis of the MMC converter After the AC and DC faults of the substation, the AC negative sequence current and DC second harmonic current characteristics before and after MMC blocking, as well as the AC and DC voltage characteristics; Converter station differential current protection for faults and internal and external faults; 3) Analyze the fault characteristics before and after the converter is blocked, and the impac...

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Abstract

The invention discloses an AC/DC fault identification and protection coordination method in a converter station belonging to the technical field of safe operation of an AC/DC hybrid transmission system. According to the characteristics of DC second harmonic current and AC negative sequence current before and after the converter lockout, the invention puts forward the converter station differentialcurrent protection, which can distinguish AC from DC faults, determine the fault area, and the coordination and cooperation scheme of AC and DC protection. Finally, combined with PSCAD/EMTDC model ofPV/DC convergent access system, the feasibility of differential protection and the reliability of AC/DC protection coordination scheme are verified. The results show that the proposed method can effectively identify AC and DC faults, and is less affected by the transition resistance.

Description

technical field [0001] The invention belongs to the technical field of safe operation of an AC-DC hybrid power transmission system, and in particular relates to an AC-DC fault identification and protection coordination method in a converter station. Background technique [0002] In the AC-DC hybrid system, in order to avoid damage to the force electronic switch due to faults, it is necessary to limit the fault current and isolate the fault quickly. A converter with fault isolation capability can be used or a current limiting device can be installed. In order to reduce the impact of faults on system operation, control strategies can be used to maintain the operation of the non-faulty part of the power grid. However, in order to reduce the impact of faults on the normal operation of non-fault lines and achieve rapid system recovery, it is still necessary to determine the fault area and complete fault isolation. The AC faults in the converter station are generally permanent f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02J3/36
CPCH02H7/261H02H7/268H02J3/36Y02E60/60
Inventor 戴志辉朱惠君马明珠黄敏
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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