Single-phase six-switching-group MMC AC-AC converter and control method thereof

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

Active Publication Date: 2014-07-02
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 converters are required, which greatly increases the engineering cost

Method used

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  • Single-phase six-switching-group MMC AC-AC converter and control method thereof
  • Single-phase six-switching-group MMC AC-AC converter and control method thereof
  • Single-phase six-switching-group MMC AC-AC converter and control method thereof

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Embodiment Construction

[0019] 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.

[0020] refer to figure 1 , the single-phase six-switch group MMC AC-AC converter of the present invention includes an AC input power supply u i , input inductance L i , the first bridge arm, the second bridge arm, the first capacitor C 1 and the load; the first bridge arm and the second bridge arm are each provided with an upper switch group (H 1 、H 2 ), medium switch group (M 1 , M 2 ), the lower switch group (L 1 , L 2 ), the first inductance (L H1 , L H2 ), the second 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 ) in series, the middle switch group M of the first ...

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Abstract

The invention provides a single-phase six-switching-group MMC AC-AC converter and a control method of the single-phase six-switching-group MMC AC-AC converter. The converter comprises an alternating current input power supply, an input inductor, a first bridge arm, a second bridge arm, a first capacitor and a load. The first bridge arm and the second bridge arm are respectively formed by connecting an upper switching group, a middle switching group, a lower switching group, a first inductor and a second inductor in series. Each switching group is formed by connecting N power switching units in series. The two ends of the load serve as output. N is a positive integer. The converter is controlled by a carrier phase-shifting PWM, the alternating current input power supply is converted into alternating current input at the 2N+1 level and supplies power to the load after being converted into alternating current output at the 2N+1 level through AC-AC conversion, stress of voltage borne by each switching pipe in each MMC power switch unit is only one Nth that of the voltage of a direct current power supply, the problem of voltage equalizing of the switching pipes is well solved, and the single-phase six-switching-group MMC AC-AC converter is suitable for places with high voltages and high power.

Description

technical field [0001] The invention relates to the field of modular multilevel converters (MMC), in particular to a single-phase six-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 eight-switch converter, the single-phase six-switch AC-AC converter saves one switch and the corresponding drive circuit, and has certain advantages in applications considering cost and volume. However, the six-switch AC-AC converter converts single-phase input AC to three-level, and outputs three-level AC. In addition, the voltage stress of each of the six switches is half of the DC bus voltag...

Claims

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Application Information

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IPC IPC(8): H02M5/458
Inventor 张波付坚丘东元
Owner SOUTH CHINA UNIV OF TECH
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