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A five-level high-voltage frequency converter

A five-level, frequency converter technology, applied to electrical components, AC power input conversion to AC power output, AC power input conversion to DC power output, etc., can solve the disadvantages of product miniaturization, low cost, high efficiency, and bulky , high machine loss and other issues

Active Publication Date: 2008-05-28
XINFENGGUANG ELECTRONICS TECH CO LTD
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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] Hereinafter, the present invention will be described in detail with reference to the drawings and embodiments.

[0027] As shown in Figure 1, the three-phase high voltage 6KV-10KV alternating current is directly sent to the rectifier unit 1 for rectification, through the capacitor circuit 2 and the forced voltage equalization circuit 3, and then sent to the high voltage inverter unit circuit 4, the high voltage inverter unit circuit 4 directly Output three-phase high voltage 6KV-10KV alternating current.

[0028] As shown in Figure 2, the rectifier circuit structure of the high-voltage inverter with input transformer is: the four secondary windings T2, T3, T4, and T5 of the power transformer are connected as follows: T2 and T5 are delta connection, and T3 and T4 are Star connection. The three-phase rectifier filter components of the T2 group are connected to a three-phase bridge uncontrolled rectifier by diodes V1, V2, V3, V4, V5, and V6, and the capacitor C1 performs filte...

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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 devices, 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 shortcomings in directly using high-voltage power devices as high-voltage inverters: 1. The higher the withstand voltage level of the device, the more du / dt. Large, unfavorable to the insulation of the motor; 2. The device is limited by the withstand voltage 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 to solve the problem of insufficient voltage resistance of the device. However, due to the phase-shifting transformer at the input, the loss of the whole machine is ...

Claims

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Application Information

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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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