Anti-misoperation method for zero-sequence differential protection of converter transformer based on dtw algorithm

A converter transformer and differential protection technology, which is applied in emergency protection circuit devices, components of emergency protection devices, emergency protection detection, etc., can solve the problems of sensitivity to abnormal points of time series data, impact on criterion adaptability, and impact on measurement quality To achieve the effect of ensuring the action performance, enhancing the ability of protection against complex inrush current and TA saturation, and strong robustness

Active Publication Date: 2022-05-06
CHINA THREE GORGES UNIV
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Problems solved by technology

Among them: the Euclidean distance algorithm, the Pearson correlation coefficient method, and the cosine distance algorithm can only achieve data synchronization matching, that is, "one-to-one" matching of data points, which is sensitive to abnormal points of time series data, and the measurement quality is easily affected by it
The Hausdorff distance algorithm needs to preprocess the data on abnormal data, that is, extract and discard extreme values, which makes the calculation process more complicated.
The criterion based on the Hausdorff distance algorithm needs to adjust the threshold value for different situations, which affects the adaptability of the criterion.

Method used

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  • Anti-misoperation method for zero-sequence differential protection of converter transformer based on dtw algorithm
  • Anti-misoperation method for zero-sequence differential protection of converter transformer based on dtw algorithm
  • Anti-misoperation method for zero-sequence differential protection of converter transformer based on dtw algorithm

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Embodiment Construction

[0064] Based on the DTW algorithm, the zero-sequence differential protection method of the converter transformer uses two zero-sequence current dynamic time bending distance values ​​for the zero-sequence differential protection of the converter transformer to detect the faults and inrush current disturbances of the converter transformer. Make a judgment.

[0065] Specifically include the following steps:

[0066] (1) Under inrush current and fault conditions, the current characteristics of the traditional zero-sequence differential protection configured by the converter transformer:

[0067] Figure 1(a), Figure 1(b), Figure 1(c), Figure 1(d) and Figure 2(a), Figure 2(b), Figure 2(c), Figure 2(d) respectively give The current waveform and protection action characteristics of the traditional zero-sequence differential protection with braking characteristics are analyzed under the conditions of no-load closing excitation inrush current and external fault removal recovery inrush...

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Abstract

Based on the DTW algorithm, the zero-sequence differential protection method of the converter transformer is used to extract the similarity between the self-produced zero-sequence current and the neutral line zero-sequence current by using the dynamic time warping distance algorithm. And form the basis for quantitative judgment. The method of the invention can effectively prevent the zero-sequence differential protection maloperation problem of the converter transformer caused by complicated inrush currents and out-of-area faults accompanied by TA saturation of the central line while ensuring the operating performance of the traditional zero-sequence differential protection with braking characteristics.

Description

technical field [0001] The invention discloses a DTW algorithm-based anti-misoperation method for zero-sequence differential protection of a converter transformer, and relates to the technical field of zero-sequence differential protection of a converter transformer. Background technique [0002] High-voltage direct current transmission system (HVDC) gradually plays an indispensable role in the power system because of its long-distance, large-capacity power transmission capability, flexible adjustment, and low power loss. The converter transformer is one of its main equipment, and its safe operation is directly related to the reliability of the power supply of the entire transmission system. Therefore, in addition to the longitudinal differential protection as the main protection, the converter transformer is also equipped with a zero-sequence differential protection that can respond sensitively to the single-phase ground fault of the Y-shaped winding. The protection should...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/045H02H1/00
CPCH02H7/0455H02H1/0007
Inventor 翁汉琍武文昊李昊威万毅黄景光李振兴
Owner CHINA THREE GORGES UNIV
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