FPGA-based all-fiber current transformer denoising method and device

A current transformer and all-fiber technology, which is applied in measuring devices, voltage/current isolation, measuring current/voltage, etc., can solve problems such as the lack of control of overall system noise, avoid the occupation of a large number of resources, and solve complex matrix operations , the effect of improving the accuracy

Active Publication Date: 2017-11-17
武汉烽火富华电气有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the usual denoising method only suppresses the noise of each part of the optical path, but lacks the control of the overall system noise

Method used

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  • FPGA-based all-fiber current transformer denoising method and device
  • FPGA-based all-fiber current transformer denoising method and device
  • FPGA-based all-fiber current transformer denoising method and device

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Embodiment 1

[0054] This embodiment provides an FPGA-based all-fiber-optic current transformer denoising method. This embodiment adopts the spartan6 series FPGA of XILINX, and utilizes the rich DSP, RAM resources and floating-point computing IP cores to complete the algorithm. complex matrix operations. Such as image 3 As shown, when the system is working, the state variable data x in 1 should be initialized first i ,in, here x 1 、x 2 、x 3 Respectively represent the amplitude, frequency and phase of the AC current signal. Calculate the average value x of each state variable by the mean value module 2 i , the covariance matrix P is calculated by the covariance module 3 xx After resampling module 4, obtain according to the following formula:

[0055]

[0056] x i =x i , i=4;

[0057]

[0058] Among them, n=7, λ=α 2 n-n, 0.0001≤α≤1, the weight is

[0059] Then the prior value calculation module 6 utilizes The calculated prior point set 7{y i}. The u obtained by ADC ...

Embodiment 2

[0061] This embodiment provides a FPGA-based all-fiber-optic current transformer denoising device to implement the denoising method in Embodiment 1, such as Figure 4 As shown, the denoising device includes: a preprocessing module 101, a weight calculation module 102, a nonlinear processing module 103, a covariance calculation module 104 and a posteriori value calculation module 105, wherein,

[0062] The preprocessing module 101 is used to collect the state signal of the current transformer and preprocess the state signal to obtain the state variable data x i ;

[0063] Weighted calculation module 102, for the obtained state variable data x i Perform weighting calculations to obtain a weighted dataset {χ i};

[0064] The nonlinear processing module 103 is used to obtain weighted data set {χ i} Perform nonlinear data processing to obtain the dataset {y i};

[0065] Covariance calculation module 104, for according to the data set {y i}, dataset {y i} mean value calculat...

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Abstract

The invention relates to the technical field of integrated circuits and particularly relates to an FPAG based all-fiber current transformer de-noising method and device. By the aid of method, the accuracy is improved through floating-point calculation mode, and by combining with the FPGA sequence management, a large number of resources are prevented from being occupied, and the problem of the calculation of the complicated matrix is solved.

Description

technical field [0001] The present invention relates to the technical field of integrated circuit technology, and in particular to an FPGA-based all-fiber-optic current transformer denoising method and device. Background technique [0002] Compared with traditional transformers, all-fiber current transformers have obvious advantages in the measurement of high voltage and high current, but like traditional transformers, measurement errors caused by noise are an unavoidable problem. [0003] At present, the methods for reducing noise mainly include: [0004] For light source noise, if the wavelength change is caused by temperature, the temperature can be directly measured to correct the wavelength, otherwise the wavelength must be measured for correction. If the effect is caused by returning light, optical isolators, signal attenuators, or low-coherence light sources such as superluminescent diodes (SLD) can be used to reduce the interference effect between reflected light an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R15/24G01R19/00
Inventor 许力李晓方兵文涛崔新友
Owner 武汉烽火富华电气有限责任公司
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