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A high-voltage inverter topology circuit and basic inverter chain circuit

A topological circuit and high-voltage frequency conversion technology, which is applied in the direction of converting AC power input to AC power output, converting AC power input to DC power output, and converting irreversible DC power input to AC power output, etc., can solve the problem of inverter output power Low level, unable to meet the requirements of national standards, difficult to output voltage and other problems, to achieve the effect of ensuring rated voltage output, avoiding circulating current phenomenon, and good current sharing effect

Active Publication Date: 2016-02-10
ZHUZHOU NAT ENG RES CENT OF CONVERTERS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the inherent differences in the parameters of individual inverter power units, it is difficult to achieve the same output voltage between different branches through control in the circuit topology formed by multiple identical inverter power units connected in series and in parallel. The flow effect is completely determined by the consistency of the topology circuit itself, which can easily cause circulation between different parallel branches, reduce the output capacity of the topology circuit, and increase the failure rate of the topology circuit;
[0007] Secondly, for this topology circuit, as the rated voltage level decreases, the number of series variable frequency power units in each converter chain decreases continuously, resulting in a continuous decrease in the output level of the frequency converter, which makes the sine degree of the output waveform of the frequency converter worse, satisfying No national standard requirements

Method used

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  • A high-voltage inverter topology circuit and basic inverter chain circuit
  • A high-voltage inverter topology circuit and basic inverter chain circuit
  • A high-voltage inverter topology circuit and basic inverter chain circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] A high-voltage frequency conversion topology circuit includes:

[0071] M basic converter chains and N switches.

[0072] The number M of basic converter chains can be determined according to the highest output voltage of the circuit. If it is a three-phase circuit, the highest output line voltage is U, and the rated output voltage of each basic converter chain is U 0 , then the number M of basic variable flow chains is:

[0073] M = 3 · U 3 U 0 - - - ( 1 )

[0074] The number N of switches and the opening or closing state of each switch are determined by various rated voltages that the circuit needs to output.

[0075] One end of each basic converter chain is connected to a switch, and the other end is connected to another switch...

Embodiment 2

[0089] image 3 Shown is a schematic structural diagram of Embodiment 2 of a high-voltage frequency conversion topology circuit of the present invention. In this embodiment, the three-phase topology circuit specifically includes 12 basic converter chains and 8 vacuum contactors, and each basic converter chain is 3 A power unit is connected in series with a reactor.

[0090] The first phase of the topology circuit is composed of the first basic converter chain, the fourth basic converter chain, the seventh basic converter chain and the tenth basic converter chain.

[0091] The second phase of the topology circuit is composed of the second basic converter chain, the fifth basic converter chain, the eighth basic converter chain and the eleventh basic converter chain.

[0092] The first phase of the topology circuit is composed of the third basic converter chain, the sixth basic converter chain, the ninth basic converter chain and the twelfth basic converter chain.

[0093] One ...

Embodiment 3

[0149] A basic converter chain circuit, including S power units connected in series with a reactor, each power unit has a separate current input terminal; wherein, S is greater than or equal to 2, and the size is determined by the rated output voltage of the power unit and the minimum output voltage of the circuit .

[0150] Preferably, in the present invention, the size of S does not exceed 12.

[0151] Preferably, in the present invention, the power unit is an H-bridge power unit.

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Abstract

The invention discloses a high-voltage frequency conversion topology circuit and a basic conversion chain circuit. The high-voltage frequency conversion topology circuit includes: M basic conversion chains and N switches; one end of each basic conversion chain is connected to a switch, and the other One end is connected to another switch and / or used as an output end; the basic converter chain includes S power units connected in series with a reactor, and each power unit has a separate power supply input end; the switch is used to control The series and / or parallel connection of M basic converter chains; the size of M is determined by the highest output voltage of the circuit; the size of N and the opening or closing of each switch are determined by the various output voltages of the circuit ; The size of S is determined by the rated output voltage of the power unit and the minimum output voltage of the circuit. The parallel current sharing effect between the branches in the circuit is good, avoiding the circulation between the parallel branches, and ensuring multiple rated voltage outputs.

Description

technical field [0001] The invention relates to the technical field of high-voltage frequency conversion speed regulation, in particular to a high-voltage frequency converter topology circuit and a basic variable current chain circuit. Background technique [0002] With the development of frequency conversion speed regulation technology, the high-voltage frequency conversion speed regulation technology of large-capacity transmission has been widely used. Among the various topological structures of high-voltage frequency converters, the cascaded high-voltage frequency converter topology uses several low-voltage frequency conversion power units connected in series to realize high-voltage output. The high-voltage inverter using this topology has the advantages of less harmonic pollution to the power grid, high input power factor, and good output waveform. It is one of the most widely used forms at present. [0003] In many practical applications, high-voltage inverters are req...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/64H02M7/49H02M5/458
CPCH02M7/49H02M7/493
Inventor 彭力黄欢罗仁俊范伟邓霆钟强欧海平王博陈志新梁金成王世平黄志国
Owner ZHUZHOU NAT ENG RES CENT OF CONVERTERS