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Method and system for constructing simulation model for electromagnetic interference prediction

A simulation model, electromagnetic interference technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as poor prediction accuracy and difficult convergence of modeling

Active Publication Date: 2019-08-30
CHINA NORTH VEHICLE RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of difficult convergence of modeling and poor prediction accuracy existing in the prior art, the present invention provides a method and system for constructing a simulation model for electromagnetic interference prediction

Method used

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  • Method and system for constructing simulation model for electromagnetic interference prediction
  • Method and system for constructing simulation model for electromagnetic interference prediction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0105] A fast modeling method for common mode characteristics of motors such as figure 1 shown, including:

[0106] Obtaining a characteristic curve of the static common mode port network scattering parameter of the motor based on the bandwidth of the test system and converting the characteristic curve of the scattering parameter of the static common mode port network of the motor into a characteristic curve of the port impedance parameter;

[0107] Carry out rational formula fitting to the functional relationship corresponding to the characteristic curve of the port impedance parameter based on the vector fitting method, obtain the vector fitting function;

[0108] The vector fitting function is equivalent to a plurality of sub-circuits according to the set rules, and the circuit obtained by connecting the sub-circuits is a simulation model for electromagnetic interference prediction;

[0109] The scattering parameters of the common mode port network include: amplitude and p...

Embodiment 2

[0170] combine figure 2 , the verification object is a permanent magnet synchronous motor with a rated power of 140kW, a rated voltage of 600Vdc and a maximum torque of 2500Nm. From figure 2 It can be seen in the figure that the port of the vector network analyzer is connected to the three-phase terminal of the motor through a parallel short wire and a coaxial line. Due to the limitation of the number of sampling points of the vector network analyzer (up to 1600 points), this in-band sampling adopts the segmented sampling method, that is, 1600 points to ensure data continuity.

[0171] The amplitude and phase frequency-domain characteristic curves of the common-mode scattering parameters obtained from the test are shown in Fig. 5(a) and (b), respectively.

[0172] Through step 2, the scattering parameters of the common mode port are converted into impedance parameters, and the converted impedance parameter amplitude and phase frequency domain characteristic curves are sho...

Embodiment 3

[0178] Based on the same idea, the present invention also provides a simulation system for electromagnetic interference prediction, including: a conversion module, a fitting module and an equivalent module;

[0179] The conversion module: obtain the characteristic curve of the scattering parameter of the static common-mode port network of the motor based on the bandwidth of the test system and convert the characteristic curve of the scattering parameter of the static common-mode port network of the motor into a characteristic curve of the port impedance parameter;

[0180] The fitting module: for performing rational fitting on the functional relationship corresponding to the characteristic curve of the port impedance parameter based on a vector fitting method to obtain a vector fitting function;

[0181] The equivalent module: used to equivalent the vector fitting function into a plurality of sub-circuits according to the set rules, and connect the sub-circuits to obtain a corr...

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Abstract

The invention provides a method and a system for constructing a simulation model for electromagnetic interference prediction. The method comprises the following steps: acquiring a motor static common-mode port network scattering parameter characteristic curve based on the bandwidth of a test system, and converting the motor static common-mode port network scattering parameter characteristic curveinto a port impedance parameter characteristic curve; performing rational fitting on a function relationship corresponding to the port impedance parameter characteristic curve based on a vector fitting method to obtain a vector fitting function; the vector fitting function being equivalent to a plurality of sub-circuits according to a set rule, and connecting the sub-circuits to obtain a circuit which is a simulation model for electromagnetic interference prediction; wherein the common mode port network scattering parameters comprise amplitude and phase angle. The simulation modeling method provided by the invention has the advantages of high modeling speed, high precision and easiness in convergence. The simulation modeling method provided by the invention has the advantages of high modeling speed, high precision and easiness in convergence.

Description

technical field [0001] The invention relates to the field of system-level electromagnetic interference simulation prediction, in particular to a method and system for constructing a simulation model for electromagnetic interference prediction. Background technique [0002] With the development of high-voltage and high-power electric drive technology, the electromagnetic compatibility problems caused by it are constantly being exposed. It is difficult to discover and solve the electromagnetic emission introduced by the electric drive system with the traditional a posteriori method based on experience and testing. It is necessary to intervene early through simulation prediction to support the electromagnetic compatibility design of the whole vehicle. [0003] For electric drive systems covering high-power equipment such as high-voltage battery packs, inverters, and motor loads, it is often difficult to converge using lumped time-domain circuit simulation modeling, and its scop...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/367Y02E60/00
Inventor 熊瑛李小健杜晓琳李中华王天楠赵晓凡
Owner CHINA NORTH VEHICLE RES INST
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