Double-input single-phase six-switch group mmc rectifier and its control method

A technology of six-switch group and switch group, which is applied in the field of dual-input single-phase six-switch group MMC rectifier and its control, can solve problems such as increasing engineering cost, and achieve the effect of solving the problem of voltage equalization, reducing engineering cost and improving quality

Active Publication Date: 2017-01-11
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 single-phase six-switch group mmc rectifier and its control method
  • Double-input single-phase six-switch group mmc rectifier and its control method
  • Double-input single-phase six-switch group mmc rectifier and its control method

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Embodiment Construction

[0020] In order to further illustrate the content and features of the present invention, the specific embodiments of the present invention will be described in detail 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 single-phase six-switch group MMC rectifier of the present invention includes a first AC input power supply u a , the second AC input power u b , the first inductance L a , the second inductance L b , the first bridge arm, the second bridge arm and the load R; the first bridge arm and the second bridge arm are all controlled by the upper switch group (H 1 、H 2 ), medium switch group (M 1 , M 2 ), the lower switch group (L 1 , L 2 ), the third inductance (L H1 , L H2 ), the fourth inductance (L L1 , L L2 ) in series; the upper switch group H of the first bridge arm 1 consists of N power switching units (SM H11 , SM H12 ,...,SM H1N ...

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Abstract

The invention provides a double-input single-phase six-switch-block MMC rectifier and a control method thereof. The rectifier comprises a first alternating-current input power supply, a second alternating-current input power supply, a first inductor, a second inductor, a first bridge arm, a second bridge arm and a rectification load. Each of the first bridge arm and the second bridge arm is formed by connecting an upper switch block, a middle switch block, a lower switch block ,a third inductor and a fourth inductor in series. The upper switch blocks, the middle switch blocks and the lower switch blocks of the first bridge arm and the second bridge arm are formed by connecting N power switch units in series. The rectifier is controlled through carrier phase-shifting PWM, and the two input alternating-current power supplies are converted into two circuits of alternating current input of the 2N+1 level, rectified and overlapped and provide power for the load. In addition, 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 single-phase six-switch-block MMC rectifier is suitable for high-voltage and large-power occasions where two single-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 single-phase six-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 eight-switch rectifier, the single-phase six-switch rectifier saves one switch and the corresponding drive circuit, and has certain advantages in applications considering cost and volume. However, the two single-phase inputs of the six-switch rectifier are both converted to two levels, and the waveform of the input AC current is relatively poor. In addition, the voltage stress of each of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/219
Inventor 张波付坚丘东元
Owner SOUTH CHINA UNIV OF TECH
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