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n-input single-phase n+1 switch group mmc rectifier and its control method

A switch group and rectifier technology, which is applied in the direction of irreversible AC power input conversion to DC power output, etc., can solve the problems of increasing engineering costs, achieve the effects of solving voltage equalization problems, improving quality, and reducing engineering costs

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 N AC lines with different frequencies are connected, 2N MMC rectifiers are required, which greatly increases the engineering cost

Method used

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  • n-input single-phase n+1 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 N-input single-phase N+1 switch group MMC rectifier of the present invention includes N AC input power supplies (u S1 , u S2 ,...,u SN ), N inductors AC inductance (L S1 , L S2 ,...,L SN ), capacitor bridge arm, switch bridge arm and load R; the capacitor bridge arm consists of N+1 capacitors (C 1 、C 2 ,...,C N+1 ) in series, and the switch bridge arm consists of N+1 switch groups (B 1 , B 2 ,...,B N+1 ), the first inductance L 1 and the second inductance L 2 formed in series; the i-th switch group B of the switch bridge arm i consists of n power switching units (SM Bi1 , SM Bi2 ,...,SM Bin ) in series, where the value of i is 1 to N+1; the ...

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Abstract

The invention provides an N input single-phase N+1 switching group MMC rectifier and a control method of the N input single-phase N+1 switching group MMC rectifier. The rectifier comprises N alternating-current inputting power supplies, N alternating-current inductors, a capacitance bridge arm, a switching bridge arm and a rectification load. The capacitance bridge arm is formed by connecting N+1 capacitors in series and the switching bridge arm is formed by connecting N+1 switching groups, a first inductor and a second inductor in series. The ith switching group of the switching bridge arm is formed by connecting n power switching units in series, wherein i is selected between 1 and N+1. The two ends of the kth alternating-current power supply serve as inputting of the kth circuit, wherein k is selected between 1 and N. The N input single-phase N+1 switching group MMC rectifier is controlled through carrier phase-shifting PWM, the N input alternating current power supplies are converted into alternating current inputting of N circuits of n+1 levels and after currents are rectified and overlapped, the load is powered. The voltage stress borne by each switching tube in an MMC power switching unit is only one nth of the voltage of the direct-current power supplies and the problem of voltage sharing of the switching tubes is solved. The N input single-phase N+1 switching group MMC rectifier is applicable to multiple-alternating-current-power-supply-inputting, high-voltage and large-power occasions.

Description

technical field [0001] The invention relates to the field of module combined multilevel converters (MMC), in particular to an N-input single-phase N+1 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 2N switching rectifier, the single-phase N+1 switching rectifier reduces N-1 switches and corresponding driving circuits, and has certain advantages in applications considering cost and volume. However, the two single-phase inputs of the N+1 switching rectifier are both converted to two levels, and the input AC waveform is relatively poor. In addition, the voltage stress of each switch ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/12
Inventor 张波付坚丘东元
Owner SOUTH CHINA UNIV OF TECH
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