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No-harmonic wave pollution high voltage large power frequency converter

A technology of harmonic pollution and frequency converter, which is applied in the conversion equipment of intermediate conversion to DC conversion, etc., can solve the problems of difficult and unsafe frequency converter filters, achieve low cost, low switching loss, and ensure safety and reliability. Effect

Inactive Publication Date: 2003-04-30
BEIJING LEADER & HARVEST ELECTRIC TECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0017] In order to solve the problem of difficult and unsafe replacement of the inverter filter, the purpose of the present invention is to provide an inverter air filter device that can replace the filter safely, simply and conveniently without stopping the machine

Method used

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  • No-harmonic wave pollution high voltage large power frequency converter
  • No-harmonic wave pollution high voltage large power frequency converter
  • No-harmonic wave pollution high voltage large power frequency converter

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Embodiment Construction

[0046] Such as figure 1 , figure 2 As shown, at present, the commonly used power unit series high-voltage inverter is mainly composed of a multi-secondary winding phase-shifting transformer 1', a plurality of power module units 2' and a control system 3'; among them, a plurality of power units 2' are connected in series Form frequency adjustable high voltage AC power supply U, V, W. The main component power module unit 2' constituting this high-voltage frequency converter is mainly composed of a diode rectifier bridge 21', a large capacitor connected in parallel on the DC bus side, a voltage equalizing resistor 22' and an inverter bridge 23'.

[0047] When the power unit is connected in series with the high-voltage inverter, a large amount of energy will be generated when the load brakes. In order to feed back this part of energy to the grid for reuse, the present invention connects a feedback bridge in antiparallel beside the rectifier bridge of the power unit, and control...

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Abstract

A high-voltage big-power frequency converter without harmonic wave pollution has an energy feedback device, a precharged circuit of bypass circuit and an easily changeable air filtering net added on the existing big-power and high-voltage frequency converter of power module unit in series connection. The said energy feedback device mainly consists of the feedback bridge control circuit and the feedback bridge connected in antiparallel at the side of rectifying bridge for each power module unit, the said bypass circuit includes the precharged circuit, silicon control and diode rectifying bridge which are connected in parallel at the said of each power module unit, the said air filtering net is mainly composed of the front panel and the filtering net supporting mechanism with the front panel having air ventilation holes on it.

Description

technical field [0001] The invention relates to a high-voltage high-power frequency converter, especially a high-voltage high-power frequency converter without harmonic pollution and equipped with an energy feedback device, a bypass circuit and an air filter device. Background technique [0002] With the development of power electronics technology, as a product of the development of power electronics technology, frequency converters have been widely used in various fields of the national economy such as metallurgy, petrochemicals, tap water, electric power and other industries, and are playing an increasingly important role. Yes, the application of high-voltage and high-power inverters is becoming more and more extensive. And by the power module unit (such as figure 1 Shown) high-voltage and high-power inverters in series (such as figure 2 Shown) as an inverter suitable for China's national conditions and excellent performance, it is favored by many inverter manufacturers...

Claims

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Application Information

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IPC IPC(8): H02M5/44
Inventor 倚鹏程世宇
Owner BEIJING LEADER & HARVEST ELECTRIC TECH
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