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A Continuous Arcing Fault Identification and Treatment Method Based on Active Injection of Converter

A technology of fault identification and processing methods, which is applied to emergency protection circuit devices, instruments, and measuring devices for limiting overcurrent/overvoltage, and can solve noise aliasing, strong randomness in frequency domain characteristics, and no obvious time domain Features and other issues to achieve accurate and reliable identification, improve safety and reliability

Active Publication Date: 2021-07-09
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0004] The external characteristics of continuous arcing faults are strongly nonlinear, without obvious time-domain characteristics, and its frequency-domain characteristics are highly random, and the frequency bands are often mixed with noise. big challenge

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  • A Continuous Arcing Fault Identification and Treatment Method Based on Active Injection of Converter
  • A Continuous Arcing Fault Identification and Treatment Method Based on Active Injection of Converter
  • A Continuous Arcing Fault Identification and Treatment Method Based on Active Injection of Converter

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Embodiment Construction

[0042] The present invention relates to a continuous arcing fault identification method and a fault processing method based on the active injection of a converter, and the following is a specific implementation thereof.

[0043] figure 1 It is a flow chart of a continuous arcing fault identification method and a fault processing method based on the active injection of a converter according to the present invention, including the following steps:

[0044] Step 1. Establish an arcing fault identification method based on the fuzzy logic membership function.

[0045] Step 2, using the characteristics of the arcing fault to set the starting criterion for the active disturbance injection control of the arcing fault.

[0046] Step 3. MMC disturbance signal injection based on the full-half-bridge hybrid topology, using the mutation characteristics of the transfer resistance as the criterion for the continuous arcing fault.

[0047] Step 4. Based on the MMC disturbance signal injecti...

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Abstract

A continuous arcing fault identification method and fault processing method based on the active injection of the converter, according to the spectrum change characteristics after the arcing fault occurs and the fault loop structure change characteristics under the excitation of the disturbance source, a membership function based on fuzzy logic is established The arcing fault starting criterion and the continuous arcing fault detection method based on active injection, and the accurate start under the influence of complex noises, realize the accurate and reliable identification of arcing faults, and provide reliable actions for MMC to actively control the voltage reduction and arcing. Basis and Judgment.

Description

technical field [0001] The invention belongs to the field of power system protection and control, and in particular relates to a continuous arcing fault identification and processing method based on the active injection of a converter. [0002] technical background [0003] The DC boost collection system has good stability and high efficiency. Large-scale new energy is increasingly applied to practical projects through DC system access, and has a good application prospect. However, system fault handling still faces great challenges. For photovoltaic DC access systems, arcing faults are the most frequent faults, which can easily cause fires and seriously endanger system safety. Some arcing faults will quickly develop into short-circuit faults, with obvious voltage and current mutations, which are quickly cleared by the protection device. The other part will become a continuous arcing fault, which is not easy to be detected by the system, resulting in continuous heating. Fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00H02H9/04
CPCG01R31/00H02H9/04
Inventor 贾科朱瑞王聪博毕天姝施志明冯涛
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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