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A Low-Latency Filter Design Method for Sampling Rate Conversion in Electronic Transformers

A technology for designing electronic transformers and filters, which is applied in the fields of instrumentation, computing, and electrical digital data processing, etc., and can solve the problems of large group delay of digital low-pass FIR filters, etc.

Inactive Publication Date: 2016-12-28
句容建中电气有限公司 +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0006] Purpose of the invention: In view of the above problems, the present invention provides a low-delay filter design method for sampling rate conversion in transformers, which is dedicated to solving the problem of large group delay of digital low-pass FIR filters and realizing fast resampling

Method used

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  • A Low-Latency Filter Design Method for Sampling Rate Conversion in Electronic Transformers
  • A Low-Latency Filter Design Method for Sampling Rate Conversion in Electronic Transformers
  • A Low-Latency Filter Design Method for Sampling Rate Conversion in Electronic Transformers

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Embodiment

[0148] Carry out various simulation analysis on 500kV two-turn transformer, the system model is as follows Figure 5 As shown, the line length is 330km, the transformer adopts Yn / D-11 connection, the transformation ratio is 500 / 13.8kV, the corner mode is the phase current differential mode with minus zero sequence, and the star-shaped side-to-triangle side corner is adopted.

[0149] The IEC60044-8 standard stipulates that the rated sampling frequency of ECT can be any one of 20 times, 48 ​​times, and 80 times the power frequency frequency. In order to make the sampling frequency of the current sampling value of each branch consistent, the corresponding extraction factor and interpolation can be determined. factor, whose structure is as Image 6 shown. So the designed low-pass filter may work at two frequencies, namely 4kHz and 12kHz.

[0150] ECT1 and ECT2 are electronic current transformers installed at the head and end of the transformer respectively, and provide sampling...

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Abstract

The invention discloses a low delay filter design method for sampling rate conversion in an electronic transformer. The method comprises the steps of first adopting cascade connection of an interpolator and an extractor to achieve conversion of random fraction ratio sampling frequency, enabling an anti-image filter in the interpolator and an anti-aliasing filter in the extractor to be combined into a low pass filter; then adopting a mean square error minimization standard to solve a coefficient vector of the filter, enabling a filter transmission band amplitude and a stop band amplitude to serve as constraint conditions, and enabling mean square error minimization to serve as an optimized target; and finally enabling a solving process of the filter coefficient vector based on constraint least square method design to be converted into solving of a positive definite quadratic programming problem so that the filter coefficient vector can be obtained by direct solving. According to the method, the problems that large output delay is caused in the direct linear convolution filtering process and the higher the filter order, the larger the group delay are solved, and rapidity of protection action is greatly improved.

Description

technical field [0001] The invention relates to a low-delay filter design method for sampling rate conversion in a transformer, which is designed based on a constrained least square method and belongs to the technical field of FIR filters. Background technique [0002] In the smart substation, the process layer of the microcomputer protection system adopts electronic transformers, and the connection between the secondary protection device of the bay layer and the process layer is realized through the network interface. The protection device receives the digital data sampled by different digital sources A / D from the communication interface. The input signal has changed from a traditional single analog signal to a mixed input of multiple digital source sampling signals. Protection devices based on the principle of differential protection usually need to obtain instantaneous differential current values, and the sampling frequency of current sampling values ​​of all branches con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 陈正才郑建勇梅军朱超黄潇贻倪玉玲崔志伟
Owner 句容建中电气有限公司
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