Multiple power supply traction system, and a method of...

Electric power conversion systems – Current conversion – Using semiconductor-type converter

Reexamination Certificate

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Details

C363S067000

Reexamination Certificate

active

06239999

ABSTRACT:

The present invention relates to multiple-powersupply traction systems capable of operating under single-phase AC and under DC, and also to methods of implementing them.
BACKGROUND OF THE INVENTION
FIG. 1
shows a state of the art multiple-powersupply traction system capable of operating under single-phase AC or under DC voltage.
In order to deliver DC to the traction inverters
1
, it is necessary under single-phase AC power
2
to use a transformer
3
whose secondary winding
4
is connected to an input AC/DC converter
5
feeding a common bus
6
.
The common bus
6
delivers power to the traction inverters
1
and to other equipment of the train (not shown).
In general, the common bus
6
must possess large total capacitance in order to deliver a stabilized voltage to the traction inverters
1
which are voltage operated, with this applying under all degraded operating modes: sudden load shedding, loss of pantograph connection, etc.
The input single-phase AC/DC converter and rectifier
5
has an output capacitor
7
.
In particular, single-phase AC/DC converter rectifiers built using IGBT components need a capacitor to be placed as close as possible in order to reduce cabling inductances.
When inputting DC power
8
, the common bus
6
is either directly connected through switch
14
to a catenary
9
via a filter
10
, or else it is powered via a DC/DC converter
11
that raises or lowers voltage.
While under DC power, the single-phase AC/DC converter rectifier
5
is conventionally isolated from the common bus
6
by opening an output contactor
12
.
A drawback of such a prior art solution is that the multiple-powersupply traction system requires the use of an additional capacitor (not shown) while being powered under DC.
OBJECT AND SUMMARY OF THE INVENTION
Accordingly, one object of the invention is to use the capacitor
7
dedicated to the single-phase AC/DC converter rectifier
5
both when under AC power and when under DC power.
This object of the invention can be achieved by providing that the capacitor
7
dedicated to the AC/DC converter rectifier
5
should be an element forming part of the total capacitance of the common bus
6
while the system is operating under DC power, as shown, for example, in FIG.
1
.


REFERENCES:
patent: 4628433 (1986-12-01), Notohamiprodjo
patent: 5521788 (1996-05-01), Miyazaki
patent: 0698519A1 (1986-02-01), None
W. Geissler et al, “Modelling the Three Phase Propulsion System of a Modern Multisystem-Locomotive”, European Conference on Power Electronics & Applications, vol. 4, Sep. 1991, pp. 632-637.
Patent Abstracts of Japan, vol. 018, No. 151 (M-1576) Mar. 14, 1994 corresponding to JP 05 328519 A (Mitsubishi Electric Crop) dated Dec. 10, 1993.

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