Intermediate-voltage concatenated frequency converter, pre-charging method and system

A pre-charging and frequency converter technology, applied in the field of frequency converters, can solve the problems of performance degradation of phase-shifting transformers, uneven magnetic field distribution of phase-shifting transformers, and increased costs

Active Publication Date: 2012-07-18
山东凯迪欧电气有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] It is necessary to add an auxiliary winding to the phase-shifting transformer body, which will increase the cost, and the addition of the auxiliary winding will make the magnetic field distribution in the phase-shifting transformer uneven, resulting in the performance degradation of the entire phase-shifting transformer

Method used

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  • Intermediate-voltage concatenated frequency converter, pre-charging method and system
  • Intermediate-voltage concatenated frequency converter, pre-charging method and system
  • Intermediate-voltage concatenated frequency converter, pre-charging method and system

Examples

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Embodiment 1

[0059] see image 3 , which is a schematic diagram of Embodiment 1 of the pre-charging module of the medium-voltage cascaded frequency converter provided by the present invention.

[0060] It should be noted that the power supply voltage input to the input terminal of the pre-charging module in this embodiment may be a three-phase 380V AC voltage or a single-phase 220V AC voltage.

[0061] One end of the pre-charging module is connected to a three-phase 380V AC voltage or a single-phase 220V AC voltage, and the secondary winding of the transformer is connected to any secondary winding in the phase-shifting transformer; or,

[0062] One end of the pre-charging module is connected to a three-phase 380V AC voltage or a single-phase 220V AC voltage, and the secondary winding of the transformer is connected to an input terminal of any power unit;

[0063] The pre-charging module is used to convert the 380V AC voltage or 220V AC voltage into a voltage consistent with the secondary ...

Embodiment 2

[0081] see Figure 7 , which is a schematic diagram of Embodiment 2 of the pre-charging module of the medium-voltage cascaded frequency converter provided by the present invention.

[0082] The difference between this embodiment and Embodiment 1 is: the pre-charging module 300b is connected to the input terminal of any power unit. In the first embodiment, the pre-charging module 300b is connected to any secondary winding of the phase-shifting transformer.

[0083] The working principle of the pre-charging module provided in this embodiment is the same as that of the pre-charging module provided in Embodiment 1, and will not be repeated here.

[0084]It should be noted that since the output terminal of the secondary winding of the phase-shifting transformer is connected to the input terminal of the power unit, the pre-charging module provided in this embodiment is connected to the input terminal of the power unit, and it can still be the secondary winding of the phase-shifting...

Embodiment 3

[0089] see Figure 8 , which is a schematic diagram of Embodiment 3 of the pre-charging module of the medium-voltage cascaded frequency converter provided by the present invention.

[0090] The connection mode of the pre-charging module 300b provided in this embodiment is: one end of the series branch is connected to the three-phase 380V AC voltage, and the other end is connected to the secondary winding closest to the neutral point of the power cell group in the phase-shifting transformer. One end of each phase power unit in the unit group is shorted together to form the neutral point O. The neutral point O is not grounded. The function of connecting the other end of the series branch to the secondary winding closest to the neutral point O is to reduce electromagnetic interference.

[0091] Such as Figure 8 As shown, the pre-charging module 300b can be connected to the power supply winding of the power unit A1, B1 or C1 (that is, the secondary winding of the phase-shiftin...

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Abstract

The invention provides an intermediate-voltage concatenated frequency converter, a pre-charging method and an intermediate-voltage concatenated frequency converter system. The intermediate-voltage concatenated frequency converter comprises a phase shift transformer, a power unit group and a pre-charging module, wherein the pre-charging module is used for converting power voltage input by the input end of the pre-charging module into pre-charging voltage which is consistent with the output voltage of a secondary winding of the phase shift transformer; the pre-charging voltage is connected with and output to any secondary winding of the phase shift transformer or the input end of any power unit of the power unit group through the output end of the pre-charging module to pre-charge the intermediate-voltage concatenated frequency converter; the pre-charging module comprises a contactor, a resistor and a transformer, and is connected to the low-voltage side of the intermediate-voltage concatenated frequency converter; and all the devices of the pre-charging module adopt low-voltage devices. By the technical scheme, the downsizing of a circuit is facilitated.

Description

technical field [0001] The invention relates to the technical field of frequency converters, in particular to a medium-voltage cascaded frequency converter, a precharging method and a system. Background technique [0002] With the rapid development of industry, the application of medium-voltage cascaded inverters is becoming more and more extensive in the field of power electronics. The working principle of the medium voltage cascaded frequency converter is introduced below. [0003] see figure 1 , which is a schematic diagram of a pre-charging module of a medium-voltage cascaded inverter provided in the prior art. [0004] Medium-voltage cascaded inverters generally include the following three parts: [0005] The first part is the transformer cabinet 100: it mainly includes a phase-shifting transformer. The function of the phase-shifting transformer is to convert the medium voltage on the input side into multiple sets of low-voltage AC outputs to provide power for multip...

Claims

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Application Information

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IPC IPC(8): H02M5/42H02M1/32
Inventor 王荣亮
Owner 山东凯迪欧电气有限公司
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