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Three-phase nine-switch group mmc AC-AC converter and its control method

A technology of nine switch groups and switch groups, which is applied in the field of three-phase nine switch group MMCAC-AC converters and their control, can solve the problems of increasing engineering costs, achieve the effect of solving voltage equalization problems and reducing engineering costs

Active Publication Date: 2016-10-05
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Three-phase nine-switch group mmc AC-AC converter and its control method
  • Three-phase nine-switch group mmc AC-AC converter and its control method
  • Three-phase nine-switch group mmc AC-AC converter and its control method

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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 three-phase nine switch group MMC AC-AC converter of the present invention comprises a three-phase AC input power supply, an AC input inductance group, a first bridge arm, a second bridge arm, a third bridge arm, and a first capacitor C 1 and three-phase load; three-phase AC input power includes u-phase power u ui , v-phase power u vi and w-phase power supply u wi ; AC input inductance group includes u-phase inductance L ui , v-phase inductance L vi and w-phase inductance L wi ; The first bridge arm, the second bridge arm and the third bridge arm are each formed in series by an upper switch group, a first inductor, a middle switch group, a second induc...

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Abstract

The invention provides a three-phase nine-switch group MMC AC-AC converter and a control method thereof. The converter of the present invention includes a three-phase AC input power supply, an AC input inductance group, a first bridge arm, a second bridge arm, a third bridge arm, a first capacitor and a three-phase load; the first bridge arm, the second bridge arm The arm and the third bridge arm are each formed by connecting an upper switch group, a first inductor, a middle switch group, a second inductor, and a lower switch group in series; each switch group is formed by connecting N power switch units in series. The converter adopts carrier phase-shift PWM control, and the three-phase AC input power is converted into an AC input with a line voltage of 2N+1 level, which is transformed by AC-AC into an AC output with a line voltage of 2N+1 level to supply power to the load. In addition, the voltage stress of each switch tube in the MMC power switch unit is only 1 / N of the DC power supply voltage, which solves the problem of voltage equalization of the switch tubes and is suitable for high-voltage and high-power applications.

Description

technical field [0001] The invention relates to the field of modular multilevel converters (MMC), in particular to a three-phase nine-switch group MMCAC-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 twelve-switch AC-AC converter, the three-phase nine-switch AC-AC converter reduces three switches and the corresponding drive circuit, and has certain advantages in the application considering cost and volume. However, the output and input of the nine-switch AC-AC converter are both three-level, and the input and output AC current waveforms are relatively poor. In addition, the voltage stress of...

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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