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A feeder current signal filtering method for DC traction

A feeder current and signal filtering technology, applied in the field of filtering, can solve problems such as easy misoperation, achieve simple structure, improve protection reliability, and increase the effect of current change rate

Inactive Publication Date: 2011-12-28
武汉长海电气科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the feeder current signal generally contains system harmonics and interference signals, and it is particularly easy to malfunction when performing current change rate protection.

Method used

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  • A feeder current signal filtering method for DC traction
  • A feeder current signal filtering method for DC traction

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Embodiment

[0017] A feeder current signal filtering method for DC traction, comprising the following steps:

[0018] Step 1, the FPGA chip controls the conversion timing of the AD conversion chip to perform AD conversion; the specific operation steps are: perform AD conversion on the current signal at a frequency of 100k, and the conversion result of the AD conversion chip is output in parallel with 16-bit signed numbers.

[0019] Step 2, the FPGA chip stores the AD conversion result after step 1 into the internal FIFORAM, and takes it out regularly; the specific operation steps are: store the AD conversion result into the M4K unit inside the FPGA chip, and the M4K The unit configures the result of AD conversion into FIFO mode.

[0020] Step 3, the FPGA chip filters the extracted data; the specific operation steps are: the FPGA chip extracts the AD conversion results in the FIFO at a frequency of 100k, extracts 10 data at a time, and uses the FIR algorithm to perform filtering processing...

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Abstract

The present invention relates to a feeder current signal filtering method for DC traction, comprising the following steps: 1, the FPGA chip controls the conversion timing of the AD conversion chip to perform AD conversion; 2, the FPGA chip converts the AD conversion result after step 1 Store it in the internal FIFORAM, and take it out regularly; 3. The FPGA chip will filter the taken out data. The invention has the advantages of: 1. strong computing ability and simple structure; 2. can quickly and effectively filter the feeder current signal in the DC traction, and improve the reliability of the current change rate protection of the DC traction feeder.

Description

technical field [0001] The invention relates to a filtering method, in particular to a feeder current signal filtering method for DC traction. Background technique [0002] Current change rate protection is an important remote short-circuit main protection in DC feeder protection in rail transit, and the protection basis mainly comes from the feeder current signal. However, feeder current signals generally contain system harmonics and interference signals, which are particularly prone to misoperation when performing current rate-of-change protection. Rail transit involves personal safety, and reliability needs to be especially strengthened. Contents of the invention [0003] The present invention mainly solves the technical problem that the feeder current signal generally contains system harmonics and interference signals in the prior art, and is particularly prone to misoperation when performing current change rate protection; it provides a kind of , can quickly and eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H17/00
Inventor 曾晶晶张涛王小进
Owner 武汉长海电气科技开发有限公司
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