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Energy feedback type power unit cascaded high voltage frequency converter

A high-voltage frequency converter and power unit technology, applied in the direction of converting AC power input to AC power output, converting irreversible DC power input into AC power output, and output power conversion devices, etc., can solve complex structures, processes, and inability Problems such as coordinated actions and complicated circuits can achieve the effect of reducing volume and weight, perfect and feasible scheme, and eliminating low-frequency pulsation

Inactive Publication Date: 2011-08-17
李永盼
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In this unit series multilevel high-voltage frequency converter, each set of secondary windings (such as 12AU) of the phase-shifting main transformer 1 is a three-phase winding, including three non-phase-shifting windings 12BU, 12BV, and 12BW (each including 3 windings) and six phase-shifting windings 12AU, 12AV, 12AW, 12CU, 12CV, 12CW (each including 6 windings), so that the main transformer 1 includes 45 secondary windings, and the structure and process are quite complicated; each power The rectifier bridge 31' of the unit (such as 3AU) includes six solid-state switches 311-316, and the inverter bridge 33 includes four solid-state switches 331-334, so the whole frequency converter includes 90 solid-state switches in total, and the cost is high; the reactor (such as 2AU) are all three-phase reactors, which are bulky and heavy; in addition, since the rectifier bridge 31' of each power unit (such as 3AU) is individually controlled by the power unit, there are complex circuits, high costs, and Defects such as inability of the rectifier bridge 31' of each power unit (such as 3AU) to coordinate actions
The above is only for the series connection of three power units per phase. If there are more power units, the disadvantages will be more prominent

Method used

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  • Energy feedback type power unit cascaded high voltage frequency converter
  • Energy feedback type power unit cascaded high voltage frequency converter
  • Energy feedback type power unit cascaded high voltage frequency converter

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Embodiment Construction

[0055] The product of the present invention will be described in further detail below in conjunction with the accompanying drawings and the embodiments of the present invention.

[0056] Here is an example of an energy feedback type high-voltage inverter with three power units connected in series for each phase. Figure 2A Shown is the schematic diagram of its main circuit wiring, Figure 2B It is composed of the circuit of its power unit. The shown high-voltage frequency converter includes a main transformer 1 , 9 reactors (eg 2AU), 9 power units (eg 3AU), a main controller 4 and a sensor circuit 5 .

[0057] The main transformer 1 shown is a three-phase multi-secondary winding transformer, its primary winding 11 is connected to the three-phase high-voltage power grid 7, and all the secondary windings (such as 12AU) are used as a group, including the same three-way (such as 12AU / 12BV / 12CW) ), each secondary winding (such as 12AU / 12BV / 12CW) also includes three windings with ...

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Abstract

The invention discloses an energy feedback type power unit cascaded high voltage frequency converter, which comprises a main transformer, reactors, power units, a master controller and the like, wherein the main transformer is a three-phase transformer with a plurality of secondary windings; the numbers of the secondary windings of each group are the same; each group of secondary windings comprises three identical paths of which each comprises three windings with the same number of turns; the three windings correspond to the three phases of the main transformer respectively; each winding is connected with the corresponding power unit by the corresponding reactor; the power units are equally divided into three groups corresponding to the three output phases of the high voltage frequency converter; the AC sides of inverter bridges of the power units of the same output phase are sequentially connected in series to obtain high voltage phase voltage; and one end of each of output links of the power units corresponding to each output phase of the high voltage frequency converter is connected, and the other ends of the output links of the power units corresponding to each output phase of the high voltage frequency converter serve as the output ends of each phase of the high voltage frequency converter respectively. The structure of the energy feedback type unit cascaded high voltage frequency converter can be simplified, the performance of the frequency converter can be improved, and the cost of the frequency converter can be reduced.

Description

technical field [0001] The invention relates to power electronics technology, in particular to an energy feedback type power unit series high-voltage frequency converter. Background technique [0002] In recent years, industrial energy conservation and consumption reduction have gradually received widespread attention. As an important power-consuming equipment, high-voltage motors are increasingly adopting variable frequency speed regulation to achieve economical operation. [0003] In the field of high-voltage inverters, since Peter W.Hammond proposed high-voltage inverters in series in 1995, this method of realizing high-voltage power conversion through low-voltage power conversion technology is due to its good output voltage waveform, low input harmonic current and low cost. Low cost and easy maintenance have become the mainstream technology of high-voltage inverters. Many high-voltage inverter manufacturers at home and abroad have launched products based on this technol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/44H02M5/458H02M1/14
CPCH02M7/49
Inventor 李永盼
Owner 李永盼
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