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Nine switch bank mmc hybrid converter and its control method

A hybrid conversion, nine-switch group technology, used in control/regulation systems, conversion equipment without intermediate conversion to AC, conversion of AC power input to DC power output, etc., can solve problems such as increasing engineering costs, and achieve voltage equalization problems, the effect of reducing engineering costs

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

AI Technical Summary

Problems solved by technology

However, when multiple DC power sources and AC power sources are connected to the grid through MMC converters, multiple sets of MMC converters are required, which greatly increases the engineering cost

Method used

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  • Nine switch bank mmc hybrid converter and its control method
  • Nine switch bank mmc hybrid converter and its control method
  • Nine switch bank mmc hybrid converter and its control method

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Embodiment Construction

[0019] In order to further illustrate the content and characteristics of the present invention, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the implementation of the present invention is not limited to this.

[0020] reference figure 1 , The nine-switch group MMC hybrid converter of the present invention includes a three-phase AC input power supply, an AC input inductor group, and a first DC power supply u dc1 , The first DC input inductor L dc1 , The second DC power supply u dc2 , The second DC input inductor L dc2 , The third DC power supply u dc3 , The third DC input inductor L dc3 The first bridge arm, the second bridge arm, the third bridge arm and the load R; three-phase AC input power includes u-phase power u acu , V-phase power u acv And w-phase power u acw ; AC input inductor group includes u-phase inductor L acu , V-phase inductance L acv And w phase inductance L acw T...

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Abstract

The invention provides a nine-switch-block MMC mixed converter and a control method of the nine-switch-block MMC mixed converter. The converter comprises a three-phase alternating-current input power source, an alternating-current input inductor set, a first direct-current power source, a first direct-current input inductor, a second direct-current power source, a second direct-current input inductor, a third direct-current power source, a third direct-current input inductor, a first bridge arm, a second bridge arm, a third bridge arm and a load. The converter is controlled by the carrier phase-shifting PWM, the three-phase alternating-current input power source is converted into the alternating-current input with the line voltage being 2N+1 levels, the voltage stress borne by each switching tube in an MMC power switch unit is only 1 / N that of the direct-current power voltage, the voltage equalizing problem of the switching tubes is well solved, and the nine-switch-block MMC mixed converter and the control method of the nine-switch-block MMC mixed converter are suitable for the application of direct access of direct-current high-voltage transmission in distributed generation.

Description

Technical field [0001] The invention relates to the field of modular combined multilevel converters (MMC), in particular to a nine-switch group MMC hybrid converter and a control method thereof. Background technique [0002] With the continuous development of distributed power generation and high-voltage DC transmission, more and more low-voltage DC power sources and low-voltage AC power sources are directly connected to the high-voltage DC grid. 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 converter topology. The three-phase nine-switch converter can directly connect the DC power supply and the AC power supply to the DC power supply. Compared with the traditional twelve-switch converter, the three-phase nine-switch converter reduces three switches and the corresponding drive circuit. Considering th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/12H02M7/219H02M3/10H02M3/155H02J1/00H02J1/10
Inventor 张波付坚丘东元
Owner SOUTH CHINA UNIV OF TECH