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2n+2 switch group mmc AC-AC converter and its control method

A control method and technology of a switch group, applied in the direction of converting AC power input into AC power output, output power conversion device, electrical components, etc., can solve problems such as increasing engineering costs, and achieve voltage equalization, quality improvement, and reduction The effect of engineering costs

Active Publication Date: 2017-10-20
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 converters are required, which greatly increases the engineering cost

Method used

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Embodiment Construction

[0021] 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.

[0022] refer to figure 1 , the 2N+2 switch group MMC AC-AC converter of the present invention includes N input / output, a first bridge arm, a second bridge arm and a first capacitor C 1 ; The input of each input / output is an AC input, and the output of each input / output is an inductive load; the first bridge arm is composed of N+1 switch groups (B 01 , B 02 ,...,B 0(N+1) ) and 2 inductors (L 01 , L 02 ) in series, and the second bridge arm consists of N+1 switch groups (B 11 , B 12 ,...,B 1(N+1) ) and 2 inductors (L 11 , L 12 ) in series; the i-th switch group B of the first bridge arm 0i consists of n power switching units (SM B0i1 , SM B0i2 ,...,SM B0in ) in series, the i-t...

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Abstract

The invention provides a 2N+2 switch group MMC AC-AC converter and a control method thereof. The converter includes N inputs / outputs, a first bridge arm, a second bridge arm and a first capacitor; the input of each input / output is an AC input, and the load of each input / output is an inductive load; the first bridge Both the arm and the second bridge arm are composed of N+1 switch groups and 2 inductors in series; each switch group is composed of n power switch units in series; the sum of the AC input and the load is N; the two loads Terminal as output; N>2, n is a positive integer. The converter adopts carrier phase-shift PWM control, and each input AC power is converted into 2n+1 level AC input, which is converted into 2n+1 level AC input by AC-AC to supply power to the inductive load, and the MMC power switch unit The voltage stress of each switching tube is only 1 / n of the DC power supply voltage, which is suitable for high-voltage and high-power applications.

Description

technical field [0001] The invention relates to the field of modular combination multilevel converters (MMC), in particular to a 2N+2 switch group MMC AC-AC converter and a control method thereof. Background technique [0002] At present, power converters are developing in the direction of miniaturization, high reliability and low loss. Under this trend, there are two directions for improving the converter: reducing passive components or improving the topology of the converter to reduce active components. New progress in the direction of source devices. Compared with the traditional 4N switch AC-AC converter, the single-phase 2N+2 switch AC-AC converter reduces 2N-2 switches and corresponding drive circuits, and has certain advantages in applications considering cost and volume. However, the N single-phase inputs or outputs of the 2N+2 switch AC-AC converter are all three-level, and the input and output AC waveforms are relatively poor. In addition, the voltage stress of e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M5/458
Inventor 张波付坚丘东元
Owner SOUTH CHINA UNIV OF TECH
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