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A method and device for virtual selection of a power supply vehicle for a capacitive filtering nonlinear load

A non-linear load, capacitive filtering technology, applied in electrical digital data processing, instruments, geometric CAD, etc., can solve the problems of accurate selection and rough estimation methods of difficult-to-power vehicles, and improve reliability and service life. Effect

Active Publication Date: 2019-04-16
SOUTHWEST CHINA RES INST OF ELECTRONICS EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The two kinds of selection of power supply vehicles adopt a rough estimation method, and it is difficult to realize accurate selection of power supply vehicles for complex capacitor filter nonlinear loads

Method used

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  • A method and device for virtual selection of a power supply vehicle for a capacitive filtering nonlinear load
  • A method and device for virtual selection of a power supply vehicle for a capacitive filtering nonlinear load
  • A method and device for virtual selection of a power supply vehicle for a capacitive filtering nonlinear load

Examples

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example 1

[0115] Example 1: Take the non-linear load of the capacitor filtering type carried by the power supply vehicle as an example of a three-phase uncontrollable capacitor filtering type unbalanced rectification load. For different load resistance and capacitance data, polynomial curve fitting is performed, and the fitted polynomial is

[0116] Linear polynomial model (95% confidence): f(x)=p1*x^4+p2*x^3+p3*x^2+p4*x+p5

[0117] Among them: p1, p2, p3, p4, p5 are polynomial coefficients, and their values ​​are:

[0118] p1=-3.05e-007

[0119] p2=2.181e-006

[0120] p3=0.0001729

[0121] p4=-0.003346

[0122] p5=0.02326

[0123] After the polynomial of the fitted curve is known, the appropriate power supply vehicle can be matched for the capacitance of different loads. If the capacitance C=0.0122F, when the ripple rate is 5%, by means of the method of the present invention, the selected power supply car should be 75kW.

example 2

[0124] Example 2: Taking the non-linear load of capacitor filtering type carried by the power supply car as an example, the three-phase uncontrollable capacitor filtering type unbalanced rectification load is used as an example. , the fitted polynomial is

[0125] f(x,y)=p00+p10*x+p01*y+p20*x^2+p11*x*y+p02*y^2

[0126] Among them: p00, p10, p01, p20, p11, p02 are linear polynomial coefficients, and their values ​​are:

[0127] p00=0.001234

[0128] p10=-0.009865

[0129] p01=-0.00966

[0130] p20=0.0001276

[0131] p11=0.0009812

[0132] p02=0.001345

[0133] After the fitted curve polynomial is known, it is possible to match the appropriate power supply vehicle for the capacitance or ripple rate of different loads. If the capacitance C=0.0049F, when the ripple rate is 5%, by means of the method of the present invention, the selected power supply car should be 45kW.

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Abstract

The invention relates to matching and model selection of a power supply vehicle in engineering application. Aiming at the problems in the prior art, the invention provides a power supply vehicle virtual model selection method and device. On the basis of establishing a relatively accurate mathematical model of the power supply vehicle, a corresponding relation of indexes including power, percentage ripple and the like related to a capacitance filtering type non-linear load and the power of the power supply vehicle can be obtained through technologies of acquiring data, pre-processing the data, modeling based on data fitting and the like, so that the matching and model selection of a carrying capability of the power supply vehicle is realized and the aims of improving the reliability and prolonging the service life of the power supply vehicle are realized. According to the power supply vehicle virtual model selection method and device, a resistance value is calculated under the condition that a known ripple rate and a capacitance value of the capacitance filtering type non-linear load are calculated according to a curved-surface fitting model or a curve fitting model in a fitting model step; then a power value of the power supply vehicle is calculated according to the resistance value; when the power supply vehicle is selected, the power value of the power supply vehicle is greater than or equal to the power value corresponding to the resistance value.

Description

technical field [0001] The invention relates to the matching and selection of power supply vehicles in engineering applications, in particular to a method and device for virtual selection of power supply vehicles for capacitor filtering nonlinear loads. Background technique [0002] The load of the power supply vehicle for radar communication mobile equipment is usually a switching power supply. If the input of the switching power supply only adopts a simple circuit structure of rectification and capacitance filtering, it will present a strong capacitance filtering nonlinear load characteristic. [0003] There are two main ways to choose the power supply vehicle at present. One is to select the power vehicle model based on the absolute value of power through load statistics and estimation; the other is to accurately calculate the power and use the statistical law of power to estimate the power vehicle model. Both types of power vehicle selection adopt rough estimation meth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/15G06F30/20
Inventor 王洪黄柱恒蒋栋年孙晓静肖建平
Owner SOUTHWEST CHINA RES INST OF ELECTRONICS EQUIP