High-speed railway traction system stepped regulation and band suppression EMI filter and design method

Abstract

The invention discloses a high-speed railway traction system stepped regulation and band suppression EMI filter, which comprises three input lines connected to equipment, and is characterized in thatthe L-line and N-line are respectively provided with differential-mode inductors, and a common-mode choke coil is connected between the L-line and the N-line; n common-mode capacitor banks are connected between upper and lower output ends of the common-mode choke coil and the PE-line, and each common-mode capacitor bank includes two common-mode capacitors and a switch; the upper output end and thelower output end of the common-mode choke coil are connected to n differential-mode capacitor banks, each differential-mode capacitor bank includes a differential-mode capacitor and a switch, each common-mode capacitor bank forms a switched capacitor bank together with one differential-mode capacitor bank, and N switched capacitor banks are arranged according to requirements. The invention further discloses a design method of the high-speed railway traction system stepped regulation and band suppression EMI filter. The filter disclosed by the invention is reliable in operation. The filter design method is simple and easy to implement.

Description

technical field [0001] The invention belongs to the technical field of rail transit electromagnetic filtering, and relates to a high-speed rail traction system with a stepwise regulation and suppression frequency band EMI filter, and the invention also relates to a design method of the high-speed rail traction system with a stepwise regulation and suppression frequency band EMI filter. Background technique [0002] With the continuous improvement of the speed of the EMU, the traction converter in its traction drive system also presents a high-power and high-density development, and the generated conducted electromagnetic interference spectrum will become more and more abundant and the range of change will be wider, while EMI filtering The converter is an effective means to suppress the conducted electromagnetic interference in the switching power converter. For the traction converter of the EMU, it will change the electromagnetic interference emission frequency band and ampl...

AI Technical Summary

Problems solved by technology

[0004] Another object of the present invention is to provide this kind of high-speed rail traction system step-by-step control and suppression frequency band EMI filter design method, which solves the analog EMI filter in the prior art, which causes changes in the EMI frequency band due to changes in the working environment and location of the high-speed rail traction system and failure problem

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