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Three-level power unit main circuit and cascaded high-voltage variable-frequency speed regulating device

A power unit, three-level technology, applied in the output power conversion device, the conversion of AC power input to AC power output, electrical components, etc. Harmonic pollution, improvement of current waveform, effect of solving the fluctuation of midpoint voltage

Pending Publication Date: 2017-09-15
SHANGHAI ELECTRIC FUJI ELECTRIC POWER TECH CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the two-level H-bridge power unit cascaded high-voltage frequency conversion speed control device usually has a large number of power units. As we all know, the reliability of the frequency conversion speed control device is greatly reduced with the increase in the number of power units. The size of the speed control device is large

Method used

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  • Three-level power unit main circuit and cascaded high-voltage variable-frequency speed regulating device
  • Three-level power unit main circuit and cascaded high-voltage variable-frequency speed regulating device

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Embodiment Construction

[0036] It should be noted that, in the case of no conflict, the following technical solutions and technical features can be combined with each other.

[0037] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0038] Such as figure 2 As shown, a three-level power unit main circuit includes:

[0039] Two incoming line end circuits 1b, each of the above incoming line end circuits 1b is used to output three-phase current;

[0040] Two rectification circuits 2b, each of the above-mentioned rectification circuits 2b is respectively coupled to the three-phase output terminal of one of the above-mentioned incoming line terminal circuits 1b;

[0041] An inverter circuit 4b, the above-mentioned inverter circuit 4b is a three-level H-bridge, and the above-mentioned two rectification circuits 2b are connected in parallel on the DC input side of the above-mentioned three-level H-bridge;

[0042] An outlet circui...

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Abstract

The invention discloses a three-level power unit main circuit which comprises the components of two wire inlet end circuits; two rectifying circuits, wherein each rectifying circuit is parallelly connected with one wire inlet end circuit; two filtering capacitors, wherein each filtering capacitor is connected with one rectifying circuit and the two filtering capacitors are serially connected; an inverter circuit which is a three-level H bridge, wherein the two filtering capacitors are parallelly connected with the DC input side of the three-level H bridge; and a wire outlet end circuit which is parallelly connected with the AC output side of the three-level H bridge. The three-level power unit main circuit is advantageous in that the two rectifying circuits are used for rectifying, thereby effectively settling midpoint voltage fluctuation and eliminating harmonic pollution of a variable-frequency speed regulating device to a power grid; smaller number of power units, more compact power unit structure, easier power unit realization, effective output level number increase and low output harmonic wave of the power unit are realized, thereby obtaining better user-friendly performance to motor insulation.

Description

technical field [0001] The invention relates to the technical field of high-voltage frequency conversion and speed regulating devices, in particular to a main circuit of a three-level power unit and a cascaded high-voltage frequency conversion and speed regulating device. Background technique [0002] With the rapid development of power electronics technology, high-voltage frequency conversion speed control devices have been widely used in electric power, metallurgy, petroleum, chemical and other fields. The main products in the market of high-voltage frequency conversion speed control devices are two-level current source type high-voltage frequency conversion speed control devices, three-level voltage source type frequency conversion speed control devices and power unit cascaded multi-level high-voltage frequency conversion speed control devices. [0003] Due to the limited withstand voltage level of a single device, a two-level current source type high-voltage variable fre...

Claims

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Application Information

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IPC IPC(8): H02M5/458H02M1/12H02P27/06
CPCH02M1/126H02M5/458H02P27/06
Inventor 李守法仲华杨文刚杨军亮齐亮陈江洪王旭黄艳李雪利
Owner SHANGHAI ELECTRIC FUJI ELECTRIC POWER TECH CO LTD
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