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Potential equalisation system for a modular multilevel converter

A modular multi-level, potential equalization technology, applied in the direction of converting AC power input to DC power output, circuits, electric switches, etc., can solve problems such as potential interruption, reduce structural costs, improve safety, and reduce material costs Effect

Active Publication Date: 2021-02-26
SIEMENS ENERGY GLOBAL GMBH CO & KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large number of contacts connected in series can lead to an interruption of the ground potential in the event of a failure of two contacts

Method used

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  • Potential equalisation system for a modular multilevel converter
  • Potential equalisation system for a modular multilevel converter
  • Potential equalisation system for a modular multilevel converter

Examples

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Embodiment Construction

[0022] figure 1 A circuit diagram of a self-commutated modular multilevel converter 1 is shown. The converter 1 has a plurality of converter modules 3 which are connected in series during normal operation of the converter 1 , only some of which are shown. The converter modules 3 form three module groups 5 to 7 arranged one above the other. Furthermore, the converter 1 has a potential equalization system according to the invention, which has an electrically conductive contact element 17 for each module group 5 to 7 and a pole contact 15 for each converter module 3 .

[0023] Each converter module 3 has a half-bridge formed by semiconductor switches 9, each of which is configured, for example, as an insulated-gate bipolar transistor (IGBT=Insulated-Gate Bipolar Transistor), with which a freewheeling diode 11 is connected. Anti-parallel connection. In addition, each converter module 3 has a DC voltage source 13 designed as a capacitor. One pole of the DC voltage source 13 is ...

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Abstract

The invention relates to a potential equalisation system for a modular multi-level converter (1) having a plurality of converter modules (3) which each have a direct current source (13). The potentialequalisation system comprises pole contacts (15), which are each electrically connected to one pole of a direct current source (13), and at least one electrically conductive contacting element (17),which can be moved between a first end position in which said contacting element is electrically isolated from the converter modules (3) and a second end position in which said contacting element contacts pole contacts (15) of different direct current sources (13) and can be placed onto an earth potential.

Description

technical field [0001] The invention relates to a modular multilevel converter having a plurality of converter modules each having a DC voltage source, for example a capacitor. Background technique [0002] In order to carry out maintenance work on such converters, it must be ensured beforehand that the DC voltage sources are discharged and that at least one pole of each DC voltage source is at ground potential. The potential connection is made, for example, via a large number of sliding contacts connected in series or via manually inserted bridge cables. However, a large number of contacts connected in series can lead to an interruption of the ground potential in the event of a failure of two contacts. Contents of the invention [0003] The technical problem to be solved by the invention is to provide a potential equalization system for a modular multilevel converter with a plurality of converter modules each having a DC voltage source, the potential equalization system ...

Claims

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Application Information

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IPC IPC(8): H02M1/44H02M7/483H01H31/00H02B1/16H02B13/075H05K9/00
CPCH02M1/44H02M7/483H01H31/003H02M7/4835
Inventor M.安休尔D.勃姆J.达尔迈耶F.道姆勒C.艾斯曼J.格里斯尔J.霍尔韦格A.休伯M.卡佩尔克M.鲁德克C.施拉梅尔T.斯托尔策M.瓦勒J.韦伯
Owner SIEMENS ENERGY GLOBAL GMBH CO & KG
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