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3N+3 switch set MMC AC-AC converter and control method thereof

A switch group and converter technology, which is applied in the direction of converting AC power input to AC power output, output power conversion devices, electrical components, etc., can solve problems such as increasing engineering costs, achieve voltage equalization problems, and reduce engineering costs. Effect

Active Publication Date: 2014-12-17
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 three-phase AC lines with different frequencies are connected, 2N MMC converters are needed, which greatly increases the engineering cost

Method used

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  • 3N+3 switch set MMC AC-AC converter and control method thereof

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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 3N+3 switch group MMC AC-AC converter of the present invention includes N three-phase AC input / output, a first bridge arm, a second bridge arm, a third bridge arm and a first capacitor C 1 ; The first bridge arm consists of N+1 switch groups (B u1 , B u2 ,...,B u(N+1) ) and 2 inductors (L u1 , L u2 ) in series, and the second bridge arm consists of N+1 switch groups (B v1 , B v2 ,...,B v(N+1) ) and 2 inductors (L v1 , L v2 ) in series, and the third bridge arm consists of N+1 switch groups (B w1 , B w2 ,...,B w(N+1) ) and 2 inductors (L w1 , L w2 ) in series; the i-th switch group B of the first bridge arm ui consists of n power switching uni...

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Abstract

The invention provides a 3N+3 switch set MMC AC-AC converter and a control method thereof. The 3N+3 switch set MMC AC-AC converter is composed of N three-phase alternating-current input / outputs, a first bridge arm, a second bridge arm, a third bridge arm and a first capacitor, each of the first bridge arm, the second bridge arm and the third bridge arm is formed by serially connecting N+1 switch sets and two inductors, each switch set is formed by serially connecting n power switch units, and three ends of each three-phase inductive load serve as a three-phase alternating-current output, wherein N and n are positive integers. Carrier phase-shifting PWM (pulse-width modulation) control is adopted, and each three-phase alternating-current output is converted into an alternating-current input with line voltage to be 2n+1 levels and converted into an alternating-current output with line voltage to be 2n+1 levels through AC-AC conversion to power a load; voltage stress borne by each switch tube in an MMC power switch unit is 1 / n of voltage of a direct-current power source, so that the problem of voltage sharing of the switch tubes is solved, and the 3N+3 switch set MMC AC-AC converter is suitable for being used in places with high voltage and high power.

Description

technical field [0001] The invention relates to the field of modular combination multilevel converters (MMC), in particular to a 3N+3 switch group MMC AC-AC converter 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 6N switching converter, the three-phase 3N+3 switch AC-AC converter reduces 3N-3 switches and corresponding driving circuits, and has certain advantages in applications considering cost and volume. However, each input and output of the 3N+3 switching AC-AC converter is three-level, and the input and output AC waveforms are relatively poor. In addition, the voltage stress of each switch in the 3N+3...

Claims

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Application Information

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