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Method, device and system for extracting direct current component based on fpga circuit

A DC component and extraction device technology, applied in the electronic field, can solve problems such as elimination, low versatility, and difficulty in collecting errors, and achieve the effects of reducing influence, good versatility, and improving accuracy

Active Publication Date: 2018-01-12
CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of pure hardware circuit may need to select different component parameters for converter systems of different power levels, and the system is not universal; and acquisition errors may occur due to the differences in component parameters and system acquisition signals, and this Acquisition errors are difficult to eliminate through hardware circuits
Therefore, the DC component extraction device in the prior art has low versatility and low accuracy

Method used

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  • Method, device and system for extracting direct current component based on fpga circuit
  • Method, device and system for extracting direct current component based on fpga circuit
  • Method, device and system for extracting direct current component based on fpga circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] figure 1 It is a flow chart of a method for extracting a direct current component based on an FPGA circuit provided by the present invention. The method includes:

[0051] S10: Obtain a control instruction sent by an external master controller.

[0052] The external main controller is connected with the FPGA circuit, and after the FPGA circuit is powered on, it receives the control command sent by the external main controller. The control instruction is divided into two types, one is the first instruction, which is used to control the FPGA circuit to determine the acquisition error; the other is the second instruction, which is used to correct the error of the collected data, see steps S11 and S13 for details.

[0053] S11: when the control instruction is the first instruction, collect the data of the transformer converted by the analog-to-digital conversion circuit every N1 unit time, and collect N2 sampling data in total;

[0054] When the control instruction acqui...

Embodiment 2

[0068] figure 2 A structural diagram of a device for extracting direct current components based on an FPGA circuit provided by the present invention. A device for extracting DC components based on FPGA circuits, including:

[0069] A receiving unit 20, configured to acquire a control instruction sent by an external master controller;

[0070] The acquisition unit 21 is used to collect the data of the transformer converted by the analog-to-digital conversion circuit every N1 unit time when the control instruction is the first instruction, and collect N2 sampling data in total;

[0071] An error acquisition unit 22, used to sum and take the average of the N2 data as the acquisition error;

[0072] An error correction unit 23, configured to perform error correction on the data of the analog-to-digital conversion circuit according to the acquisition error when the control instruction is the second instruction;

[0073] The storage unit 24 is used to store the error-corrected d...

Embodiment 3

[0088] image 3 A structural diagram of a DC component extraction system provided by the present invention. The system includes the FPGA circuit-based DC component extraction device 30 described in Embodiment 2, and also includes:

[0089] A voltage sampling circuit 31, configured to collect the first line voltage and the second line voltage of the transformer;

[0090] An operational amplifier circuit 32 connected to the voltage sampling circuit 31 for scaling the first line voltage and the second line voltage;

[0091] The analog-to-digital conversion circuit 33 connected to the operational amplifier circuit 32 is used to convert the analog signal corresponding to the scaled first line voltage and the second line voltage into a digital signal;

[0092] Wherein, the direct current component extraction device 30 based on the FPGA circuit is connected with an analog-to-digital conversion circuit 33 and an external main controller 34 .

[0093] like image 3 As shown, resist...

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Abstract

The invention discloses a method for extracting DC components based on an FPGA circuit. Acquisition errors are acquired through the first instruction sent by an external main controller, and then error correction is performed on the newly converted data obtained by the analog-to-digital conversion circuit according to the acquisition errors, thereby reducing The influence of the acquisition error on the extraction of the DC component is eliminated, and the accuracy is improved. In addition, since the parameter configuration is controlled by an external master controller, it has better versatility. The invention also discloses an FPGA circuit-based DC component extraction device and system corresponding to the above method.

Description

technical field [0001] The present invention relates to the field of electronic technology, in particular to a method, device and system for extracting DC components based on FPGA circuits. Background technique [0002] At present, IGBT / IGCT converters have been widely used in transmission control fields such as metallurgy, ships, and wind power, while grid-side four-quadrant rectification control and inverter motor control are one of the core components of the entire converter system. Due to the unbalanced three-phase AC, the influence of IGBT / IGCT on the dead time of the tube, and the system's inherent DC bias in the acquisition circuit of the control unit, the PWM voltage will generate a DC component. The DC component entering the transformer will cause the transformer bias magnetic saturation, deviation Saturation leads to overheating of the transformer, damage to the transformer, and distortion of the AC current waveform, which causes the increase of system harmonics an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/48
Inventor 尚敬冯江华刘可安郭赞陈涛刘浩平南永辉罗凌波武彬戴计生
Owner CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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