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Device for converting an electric current

A technology for converting current and regulating device, which is applied to the conversion device of output power, the conversion of irreversible DC power input into AC power output, and the conversion of AC power input into DC power output, etc. It can solve the problem of uncontrollable regulation technology

Active Publication Date: 2009-10-07
SIEMENS ENERGY GLOBAL GMBH CO & KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of low switching frequencies below 200 Hz, the loop current is practically uncontrollable and unavoidable in terms of control technology with small inductances

Method used

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  • Device for converting an electric current
  • Device for converting an electric current
  • Device for converting an electric current

Examples

Experimental program
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Embodiment Construction

[0021] figure 1 An exemplary embodiment of a device 1 according to the invention is shown, which consists of three phase modules 2a, 2b and 2c. Each phase module 2a, 2b and 2c is connected to a positive direct voltage line p and to a negative direct voltage line n, so that each phase module 2a, 2b, 2c has two direct voltage connections. Furthermore, an AC voltage connection 3 is provided for each phase module 2a, 2b and 2c 1 、3 2 and 3 3 . AC voltage connector 3 1 、3 2 and 3 3 It is connected to the three-phase AC grid 5 through the transformer 4 . Phase voltages U1 , U2 and U3 drop across the phases of the alternating current network 5 , through which network currents In1 , In2 and In3 flow. The phase currents on the AC voltage side of each phase module are denoted by I1 , I2 and I3 . DC current is I d . On each AC voltage connector 3 1 、3 2 and 3 3 Phase module branches 6p1 , 6p2 and 6p3 run between the positive direct voltage line p and the positive DC voltage...

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Abstract

The invention relates to a device (1) comprising: at least one phase module (2a, 2b, 2c) with an A.C. voltage connection (31,32,33) and at least one d.c. voltage connection (p,n), a phase module branch (6p1, 6p2, 6p3, 6n1, 6n2, 6n3) being arranged between each d.c. voltage connection (p,n) and the a.c. voltage connection (31,32,33) and each phase module branch (6p1, 6p2, 6p3, 6n1, 6n2, 6n3) having a series circuit of sub-modules (7), each of which has an energy accumulator (8) and at least one power semiconductor (T1,T2); and regulating means for regulating the device. The aim of the invention is to provide a device that can regulate circulating currents in a targeted manner. To achieve this, each phase module (2a, 2b, 2c) has at least one inductance (Lkr) and the regulating means are designed to regulate a circulating current that flows through the phase modules (2a, 2b, 2c).

Description

technical field [0001] The invention relates to a device for switching electrical currents, with at least one phase module having an AC voltage connection and at least one DC voltage connection, wherein a phase module support is formed between each DC voltage connection and the AC voltage connection circuit, and wherein each phase module branch has a series circuit consisting of submodules, each of which has an energy store and at least one power semiconductor, and has a regulating device for regulating the device. Background technique [0002] Such a device is disclosed, for example, in the article "An Innovative Modular Multilevel Converter Topology Suitable for a Wide Power Range" by A. Lesnicar and R. Marquardt at Powertech 2003. There, a converter is disclosed which is provided for connection to an AC grid. The converter has a phase module for each phase of the AC network to be connected, wherein each phase module has an AC voltage connection and two DC voltage connect...

Claims

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Application Information

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IPC IPC(8): H02M7/49
CPCH02M7/49H02M2007/4835H02M7/483H02M1/0003H02M7/4835
Inventor 迈克·多马希克乔格·多恩英戈·尤勒乔格·兰达格·索兰格尔夸克-布·图克劳斯·沃尔夫林格
Owner SIEMENS ENERGY GLOBAL GMBH CO & KG