Title:
TRAIN TRACTION SYSTEM
Document Type and Number:
WIPO Patent Application WO/2019/074070
Kind Code:
A1
Abstract:
A traction system for a train is provided. The traction system has plural transformers for stepping down a voltage level of AC electric power provided from an overhead wire. The traction system further has plural converter units for supply of electric power to motors of the train. Each converter unit includes an AC/DC convertor for converting the stepped down AC electric power provided by one of the transformers to DC electric power. The AC/DC converters are configured to use pulse width modulation to convert the stepped down AC electric power on the basis of respective pulse signals which each have the same switching frequency but are phase shifted from each other to substantially cancel out second order harmonic noise from the pulse signals. The traction system further has plural first switches which are closable to respectively connect high voltage sides of the transformers to the overhead wire, the closing of each first switch provoking an inrush current into the respective transformer. The traction system further has a controller that is configured to control the timing of the closing of the first switches such that the first switches are closed in sequence with a first predetermined time interval between closures. The controller is further configured to control the timing of the start of power conversion using pulse width modulation by each of the AC/DC converters such that the starts are simultaneous and after the first switches have closed.
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Inventors:
MOCHIZUKI KENTO (GB)
OURA YUTA (JP)
INARIDA SATORU (JP)
OURA YUTA (JP)
INARIDA SATORU (JP)
Application Number:
PCT/JP2018/037961
Publication Date:
April 18, 2019
Filing Date:
October 11, 2018
Export Citation:
Assignee:
HITACHI LTD (JP)
International Classes:
B60L9/24
Domestic Patent References:
| WO2015079540A1 | 2015-06-04 |
Foreign References:
| JP2015198544A | 2015-11-09 | |||
| JPH0583803A | 1993-04-02 | |||
| GB2527881A | 2016-01-06 | |||
| GB2537732A | 2016-10-26 |
Other References:
See also references of EP 3694741A4
Attorney, Agent or Firm:
PATENT CORPORATE BODY DAI-ICHI KOKUSAI TOKKYO JIMUSHO (JP)
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