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High-voltage frequency converter topology circuit and basic converter 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 national standard requirements, difficult to output voltage and other problems, to achieve the effect of ensuring the rated voltage output, avoiding the phenomenon of circulating current, and good current sharing effect

Active Publication Date: 2013-01-16
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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  • High-voltage frequency converter topology circuit and basic converter chain circuit
  • High-voltage frequency converter topology circuit and basic converter chain circuit
  • High-voltage frequency converter topology circuit and basic converter chain circuit

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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 size of 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 maximum 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 size of the number of switches N, the opening or closing state of each switch, is determined by the size of the various rated voltages that the circuit needs to output.

[0075] One end of each basic converter chain is connected to one switch, and the o...

Embodiment 2

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

[0090] The first phase of the topological 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 topological 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.

...

Embodiment 3

[0149] A basic converter chain circuit includes S power units and a reactor connected in series, and each power unit has a separate current input terminal; where 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 converter topology circuit and a basic converter chain circuit. The high-voltage frequency converter topology circuit comprises M basic converter chains and N switches. One end of each basic converter chain is connected with one switch while the other end of the basic converter chain is connected with another switch and / or serves as an output end. Each basic converter chain comprises S power units and an electric reactor which are connected in series, and each power unit is provided with an independent power supply input end. The switches are used for controlling series connection and / or parallel connection of the M basic converter chains. The M is decided according to the highest output voltage of the circuit; the N and on-off of each switch are decided according to different output voltage values, and the S is decided according to rated output voltage of the power units and the lowest output voltage of the circuit. Different branches of the circuit are in parallel connection so that current sharing effect is good, circulation among the branches in parallel connection is avoided, and various rated voltage outputs are guaranteed.

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 converter 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 high-voltage inverter topologies, the cascaded high-voltage inverter topology uses several low-voltage variable-frequency power units connected in series to achieve 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 required to drive motors of various voltage levels...

Claims

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Application Information

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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