Double-input three-phase nine-switch group mmc rectifier and its control method

A technology of nine switch groups and control methods, which is applied in the direction of converting AC power input to DC power output, output power conversion devices, electrical components, etc., can solve problems such as increasing engineering costs, and achieve voltage equalization problems, quality improvement, The effect of reducing engineering cost

Active Publication Date: 2016-07-06
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when two AC lines with different frequencies are connected, two MMC rectifiers are required, which greatly increases the project cost

Method used

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  • Double-input three-phase nine-switch group mmc rectifier and its control method
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  • Double-input three-phase nine-switch group mmc rectifier and its control method

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Embodiment Construction

[0020] In order to further illustrate the content and characteristics of the present invention, the specific embodiments of the present invention will be described below in conjunction with the accompanying drawings, but the implementation of the present invention is not limited thereto.

[0021] refer to figure 1 , the dual-input three-phase nine-switch group MMC rectifier of the present invention includes the first u-phase voltage source u ua , the first v-phase voltage source u va , the first w-phase voltage source u wa , the first u-phase inductance L ua , the first v-phase inductance L va , the first w-phase inductance L wa , the second u phase voltage source u ub , the second v-phase voltage source u vb , the second w-phase voltage source u wb , the second u-phase inductance L ub , the second v-phase inductance L vb , the second w-phase inductance L wb , the first bridge arm, the second bridge arm, the third bridge arm and the load R; the first bridge arm, the ...

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Abstract

The invention provides a double-input three-phase nine-switch-block MMC rectifier and a control method thereof. The rectifier comprises two three-phase voltage sources, two sets of three-phase inductors, a first bridge arm, a second bridge arm, a third bridge arm and a rectification load. Each of the first bridge arm, the second bridge arm and the third bridge arm is formed by connecting an upper switch block, a middle switch block, a lower switch block and two inductors in series. Each switch block is formed by connecting N power switch units. The rectifier is controlled through carrier phase-shifting PWM. Two input alternating-current power supplies are converted into alternating-current input of the three-phase 2N+1 level, rectified and overlapped and provide power for the load. The voltage stress borne by each switching tube in each MMC power switch unit is only 1 / N of the voltage of a direct-current power supply, the voltage sharing problem of the switching tubes is well solved, and the double-input three-phase nine-switch-block MMC rectifier is suitable for high-voltage and large-power occasions where two three-phase alternating-current power supplies are input.

Description

technical field [0001] The invention relates to the field of modular multilevel converters (MMC), in particular to a dual-input three-phase nine-switch group MMC rectifier and a control method thereof. Background technique [0002] At present, power rectifiers are developing in the direction of miniaturization, high reliability and low loss. Under this trend, there are two directions for improving rectifiers: reducing passive components or improving rectifier topology to reduce active components as the direction of reducing active components new progress. Compared with the traditional twelve-switch rectifier, the three-phase nine-switch rectifier reduces three switches and the corresponding drive circuit, and has certain advantages in the application considering cost and volume. However, the two three-phase inputs of the nine-switch rectifier are both two-level, and the input AC current waveform is relatively poor. In addition, the voltage stress of each of the nine switch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/217
Inventor 张波付坚丘东元
Owner SOUTH CHINA UNIV OF TECH
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