The establishment method of the common-mode emi model and its equivalent circuit for high-speed EMUs

Abstract

The invention discloses a method for establishing a common-mode EMI model of a high-speed EMU and an equivalent circuit thereof. Including the establishment of the EMI model diagram of the whole vehicle; the establishment of the EMI model diagram of the traction converter; the establishment of the equivalent circuit diagram of the common-mode EMI circuit caused by the potential point A of the rectifier bridge of the high-speed EMU, and then calculate the conduction EMI current according to the equivalent circuit; The equivalent circuit after the converter, then the conducted EMI current is calculated from the equivalent circuit. The model and equivalent circuit in the method describe the common-mode EMI characteristics of the high-speed EMU, including the distribution of the common-mode capacitance to ground, the high-frequency model of the cable, and the high-frequency parasitic characteristics of the primary and secondary sides of the transformer. The model and its equivalent circuit predict the common-mode EMI characteristics of the whole vehicle. As a technical means for the common-mode EMI research of high-speed EMUs, the mathematical expression of the common-mode EMI current is obtained from the equivalent circuit, and this formula predicts the common-mode EMI of the whole vehicle Current size.

Description

Technical field [0001] The present invention belongs to the field of high-speed rail traffic, and it is related to the establishment of a common mode EMI model and its equivalent circuit thereof. Background technique [0002] With the increasing development of China's high-speed rail technology, its electromagnetic compatibility problem is getting closer, in the analysis of EMI problem of high-speed EMI, there is no EMI model and equivalent circuit, and cannot recognize the full vehicle EMI characteristics, and cannot analyze the vehicle. EMI problem, more disclosures, a single-vehicle common-mode EMI model and equivalent circuit for the analysis of the common model EMI. Therefore, based on the above problems, the present invention proposes a method of establishing a high-speed vehicle group consolidation EMI model and an equivalent circuit. Based on the proposed method of establishing a math expression EMI characteristic using mathematical expressions, predicting the common mode...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for establishing a common-mode EMI model and an equivalent circuit of a high-speed train set, which solves the problem that there is no support for a common-mode EMI model and an equivalent circuit for a high-speed train set in the process of researching the EMI characteristics of a high-speed train set problem, and also solves the problem that the common mode EMI characteristics cannot be described by mathematical expressions

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