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A five-level high-voltage frequency converter

A high-voltage inverter, five-level technology, applied in electrical components, AC power input to AC power output, AC power input to DC power output, etc. High cost efficiency, poor motor insulation, etc.

Active Publication Date: 2011-01-12
XINFENGGUANG ELECTRONICS TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the development of modern power electronic devices, their voltage levels continue to increase, but there are still many defects in using high-voltage power devices directly as high-voltage inverters: 1. The higher the withstand voltage level of the device, the higher the du / dt Large, which is not good for the insulation of the motor; 2. The device is limited by the voltage-resistant material, and it is impossible to increase without limit
At present, high-voltage inverters generally use the method of adding a phase-shifting transformer at the input end to solve the problem of insufficient withstand voltage of the device. However, due to the phase-shifting transformer at the input end, the loss of the whole machine is high and the volume is large, which is not conducive to the miniaturization and low-cost of the product. Development in the direction of cost and high efficiency

Method used

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  • A five-level high-voltage frequency converter
  • A five-level high-voltage frequency converter
  • A five-level high-voltage frequency converter

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Embodiment Construction

[0026] The present invention will be specifically described below in conjunction with the accompanying drawings and embodiments.

[0027] Such as figure 1 As shown, the three-phase high-voltage 6KV-10KV alternating current is directly sent to the rectifier unit 1 for rectification, passes through the capacitor circuit 2 and the forced voltage equalization circuit 3, and then is sent to the high-voltage inverter unit circuit 4, and the high-voltage inverter unit circuit 4 directly outputs three-phase High voltage 6KV-10KV AC.

[0028] Such as figure 2 As shown, the rectifier circuit structure of the high-voltage frequency converter with input transformer is: the connection method of the four secondary windings T2, T3, T4, T5 of the power transformer is, T2, T5 is a delta connection, T3, T4 is a star connection Law. The three-phase rectification filter device of T2 group is connected by diodes V1, V2, V3, V4, V5, V6 to form a three-phase bridge type uncontrolled rectificatio...

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Abstract

The invention relates to the technical filed of the multi-power-level high-voltage transducer, in particular to a five power-level transducer and the control method thereof. The five power-level of the invention is formed by connecting a high-voltage rectifier circuit, a high-voltage capacitor filter circuit, a voltage balancing circuit, and an inverting circuit in turn. The invention is characterized in that the inverting circuit adopts one or two apparatus / apparatuses in the IGBT and the IGCT to form an inverter, adopts a diode clamping five-power-level structure and three inverters with uniform bridge arms. The invention can provide higher resolution and can obtain better harmonic characteristic for the low-voltage area of a signal, better output characteristic and high-voltage high-power output for the high-voltage area of the signal; in addition, the invention has the advantages of easy control, and being safe and reliable.

Description

(1) Technical field [0001] The invention relates to the technical field of multi-level high-voltage frequency converters, in particular to a five-level high-voltage frequency converter based on hybrid components, and a control method thereof. (2) Background technology [0002] With the development of modern power electronic devices, their voltage levels continue to increase, but there are still many defects in using high-voltage power devices directly as high-voltage inverters: 1. The higher the withstand voltage level of the device, the higher the du / dt Large, which is not good for the insulation of the motor; 2. The device is limited by the voltage-resistant material, and it is impossible to increase it without limit. At present, high-voltage inverters generally use the method of adding a phase-shifting transformer at the input end to solve the problem of insufficient withstand voltage of the device. However, due to the phase-shifting transformer at the input end, the loss...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M5/458H02M5/12H02M7/217H02M7/5387
Inventor 何洪臣李瑞来胡顺全
Owner XINFENGGUANG ELECTRONICS TECH CO LTD
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