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Drive for a phase module branch of a multilevel converter

A technology of phase modules and converters, which is applied in the direction of converting AC power input to DC power output, output power conversion devices, electrical components, etc., and can solve problems such as high load of power semiconductor circuits, high maintenance costs, and frequent failures

Active Publication Date: 2012-07-04
SIEMENS ENERGY GLOBAL GMBH CO & KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The known method has the disadvantage that the power semiconductors of the selected capacitors are switched at a high clock frequency
This leads to a high load on the power semiconductor circuits, with frequent failures and costly maintenance work as a result

Method used

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  • Drive for a phase module branch of a multilevel converter
  • Drive for a phase module branch of a multilevel converter
  • Drive for a phase module branch of a multilevel converter

Examples

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Embodiment Construction

[0019] figure 1 By way of example, a multilevel converter 1 composed of three phase modules 2a, 2b and 2c is shown. 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 and 2c has two direct voltage connections. In addition, 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 . The phase voltages U1 , U2 and U3 drop in each case on the respective phases of the alternating current network 5 , where the 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 are formed with the positive DC voltage line p. On each AC voltage connector 3 ...

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Abstract

Method for charging and / or discharging energy stores in a multilevel converter having at least one phase module branch (6p1, 6p2, 6p3, 6n1, 6n2, 6n3), which has a series circuit formed by sub-modules (7) which each have at least one power semiconductor circuit (T1, T2) for connection or disconnection of an energy store (8) in a parallel circuit to the power semiconductor circuit and have a sub-module sensor for detection of an energy store actual value Uc, in which: with an energy change state being obtained a determination is made as to whether connected energy stores in a phase module branchcan be charged or discharged and the next energy store to be switched in each phase module branch is selected by means of predetermined logic as a function of the energy change state, by means of which the energy stored in the energy stores is kept approximately at the same level, with a high clock rate at the same time being avoided for connection and disconnection of the selected energy store.

Description

technical field [0001] The invention relates to a method for charging and / or discharging an energy store of a multilevel converter having at least one phase module branch with a series connection of submodules circuits, the submodules each have at least one power semiconductor circuit for switching on or off an energy store connected in parallel with the power semiconductor circuit, and a submodule sensor for detecting the actual value of the energy store, wherein the phase module branch is determined The switched-on energy store can be charged or discharged to obtain an energy change state, and depending on the energy change state, the next energy store to be switched is selected for each phase module branch by means of a predetermined logic. Background technique [0002] Such devices and methods are disclosed, for example, in "New Modular Voltage Source Inverter Topology" by A. Lesnicar and R. Marquardt. A so-called multi-level converter and a method for its control are d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483
CPCH02M7/483H02M2007/4835H02M1/0003H02M7/4835
Inventor 迈克·多玛希克乔格·多恩英戈·尤勒乔格·兰夸克-布·图克劳斯·沃夫林格
Owner SIEMENS ENERGY GLOBAL GMBH CO & KG
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