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Controlling a modular converter

A technology of control modules and converters, applied in the direction of converter types, control drives, control devices, etc., to achieve high efficiency

Active Publication Date: 2015-07-08
ABB (SCHWEIZ) AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the circulating current required to support ZVS results in nearly equal switching losses

Method used

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  • Controlling a modular converter
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  • Controlling a modular converter

Examples

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Embodiment Construction

[0052] figure 1 A modular converter 10 for an electric train or tram is shown, which may also be called a Power Electronic Transformer (PET). In general, modular converters can be adapted to convert medium AC voltages to low or medium DC voltages. The converter has an input 12 connected by a pantograph 14 to a catenary or overhead line 16 which supplies the converter 10 with a medium-voltage AC input voltage. The converter 10 has a ground point 18 which connects the converter 10 to the earth 22 via wheels 20 of the train or tram.

[0053] The converter 10 has a positive DC output 24 and a negative DC output 25 which supply a DC output voltage of approximately 1 kV to the load 26 of the train or tram, ie the on-board electrical installations. Load 26 may include an electric DC motor, another converter, and / or an auxiliary power supply.

[0054] In general, converter 10 is an AC-DC converter having a first AC or line side 32 providing input 12 and ground 18 , and a second DC ...

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PUM

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Abstract

A modular converter (10) comprises a plurality of converter cells (36), which are connected in series on a first side and are connected on a second side, wherein each converter cell (36) comprises an AC-to-DC converter (40) connected to the first side and a DC-to-DC converter (42) connected to the second side. A method for controlling the modular converter (10) comprises the steps of: estimating the power transferred by the modular converter (10); comparing the transferred power with a threshold value; when the transferred power is bigger than the threshold value, operating the modular converter in a normal load operation mode (116, 122, 128); when the transferred power is smaller than the threshold value, operating the modular converter in a low load operation mode (114, 120, 126), in which the converter cells (36) are operated, such that switching losses are reduced with respect to the normal load operation mode.

Description

technical field [0001] The present invention relates to a method of controlling a modular converter, a controller of a modular converter and a modular converter. Background technique [0002] An electric train or tram may have a modular converter comprising a plurality of converter cells that use an AC input voltage to generate a DC output voltage that is supplied to the rest of the on-board electrical devices. Typically, the AC input voltage is supplied from overhead lines. [0003] A converter cell of a modular converter may comprise a resonant DC-DC converter, wherein the DC-AC converter on the line side is connected to the AC-DC converter on the motor side via a resonant transformer. Both DC-AC converters and AC-DC converters may be active converters with controllable semiconductor switches. [0004] The control method of the modular converter is based on hard switching of the semiconductors of the AC-DC converter and soft switching of the semiconductors of the DC-DC c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L9/00
CPCB60L2240/526H02M2001/0074B60L2200/26B60L2210/30B60L2240/527B60L9/12B60L2240/529Y02T10/7283H02M7/49Y02T10/7241Y02T10/7216B60L15/2045H02M2001/0032B60L2210/10H02M3/33507Y02T10/64Y02T10/72H02M1/0032H02M1/0074
Inventor A.梅斯特D.杜吉克T.贝泽尔曼
Owner ABB (SCHWEIZ) AG
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