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A method for operating parallel-connected inverters

An inverter-level, three-phase inverter technology, applied in instruments, regulating electrical variables, control/regulating systems, etc., can solve problems such as transmission rate limitation, system error prone to increase, etc., to reduce wiring costs, The effect of a simple structure

Active Publication Date: 2018-09-04
SCHNEIDER ELECTRIC POWER DRIVES GMBH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Therefore, in practice, the number of inverter stages connected in parallel is strictly defined and limited to a few converters
Furthermore, as the number of parallel-connected inverters increases, the transmission paths to the central control unit also gradually become longer, so that together with the limited transmission rate of the measured data for the parallel transmission, the entire system is prone to There is also a significant increase in error
[0004] Therefore, for actuating parallel-connected inverter stages, light conductor connections are also used, but they again have disadvantages due to their temperature sensitivity
Furthermore, the outlay and costs of photoconductor-based manipulation are similar to those of conventional analog parallel manipulation
A similar situation applies to fieldbus systems, which also have disadvantages for actuating the switching elements of the inverter stage due to their limited transmission rates and sometimes high delay times

Method used

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  • A method for operating parallel-connected inverters
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  • A method for operating parallel-connected inverters

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Embodiment Construction

[0040] figure 1 An arrangement 1 is shown consisting of a plurality of parallel-connected inverter stages 2 having a common three-phase output 14 . At this output 14 the arrangement 1 supplies the desired output current. In the illustrated embodiment, a common input 15 of the inverter stages 2 is also shown, to which an input voltage is applied during operation.

[0041] Each inverter stage 2 comprises six switching elements 3 each having two switching states ( figure 2 ), whereby the theoretical number of total switching states of the inverter stage 2 is given by all combination possibilities. In the case of six switching elements 3 (as in the figure 2 As clearly visible in the embodiment of ), resulting in 64 theoretically possible total switching states. These total switching states are reduced to 27 permissible general switching states, since there are also unreliable switching states which could lead to short circuits. The overall switching state of the inverter st...

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Abstract

The invention relates to a method for operating parallel-connected inverter stages (2), wherein each inverter stage (2) has a plurality of switching elements (3) each having two switching states. According to the invention, the inverter stages (2) are actuated via a central regulation unit (6) which communicates with each inverter stage (2) via a serial data transmission path (5) )connect. In order to transmit the selected switching states from the central control unit (6) to the corresponding inverter stage (2), measures are provided to ensure the reliability of the inverter stage (2) on the one hand via a plurality of switching processes operation and reliably avoids functional influences on the switching elements (3) due to incorrect actuation, while on the other hand the actuation of the switching elements (3) of the inverter stage (2) remains This is done quickly enough so as not to affect the quality of the output current formed by said inverter stage (2).

Description

technical field [0001] The invention relates to a method for actuating switching elements of parallel-connected three-phase inverter stages. Background technique [0002] This method is described in EP 2 595 304 . US 2004 / 093533 describes a parallel circuit of so-called point-of-load inverters with a central controller and a serial transmission path for control signals. A three-phase inverter stage is used to form the desired output current by corresponding switching of the switching elements and can be found, for example, in variable speed drives, where the variable speed In the driving device, in order to form the desired alternating current, the input alternating current is first converted into direct current, and then it is converted into the desired alternating current by an appropriate switching sequence of the individual inverter switching elements. Inverter stages are found in particular in converters, wherein the converter is conventionally provided with a power p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/493
CPCG05F1/20H02M1/0845H02M7/53873H02M7/493H02M1/0012H02M7/537
Inventor R·费尔因格G·莱纳
Owner SCHNEIDER ELECTRIC POWER DRIVES GMBH
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