Six switch group mmc hybrid converter and its control method

A technology of mixed conversion and six switch groups, which is applied in the control/regulation system, DC power input conversion to DC power output, AC power input conversion to DC power output, etc., can solve the problems of increasing project 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

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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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  • Six switch group mmc hybrid converter and its control method
  • Six switch group mmc hybrid converter and its control method
  • Six switch group mmc hybrid 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 six-switch group MMC hybrid converter of the present invention includes an AC input power supply u ac , AC input inductance L ac , the first DC power supply u dc1 , the first DC input inductance L dc1 , the second DC power supply u dc2 , the second DC input inductance L dc2 , the first bridge arm, the second bridge arm and the load R; the first bridge arm and the second bridge arm are each composed of 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 leg inductance (L H1 , L H2 ), the second arm inductance (L L1 , L L2 ) in series; the upper switch group H of the first bridge ar...

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Abstract

The invention provides a six-switch-block MMC mixed converter and a control method of the six-switch-block MMC mixed converter. The converter comprises an alternating-current input power source, an alternating-current input inductor, 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 first bridge arm, a second bridge arm and a load. The first bridge arm and the second bridge arm are respectively formed by connecting an upper switch block, a middle switch block, a lower switch block, a first bridge arm inductor and a second bridge arm inductor in series. Each switch block is formed by connecting N power switch units in series, wherein N is a positive integer. The converter is controlled by the carrier phase-shifting PWM, the alternating-current input power source is converted into the alternating-current input of the 2N+1 levels, the direct-current input power source is converted into multiple levels which are converted into direct-currents through the converter, and then the direct-currents are output to provide power for the load. 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 six-switch-block MMC mixed converter and the control method of the six-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 multilevel converters (MMC), in particular to a six-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 power grid. At present, power converters are developing towards miniaturization, high reliability and low loss. Under this trend, there are two directions for improving converters: reducing passive components or improving converter topology. The single-phase six-switch converter can directly connect the DC power supply and the AC power supply to the DC power supply. Compared with the traditional eight-switch converter, the single-phase six-switch converter reduces two switches and the corresponding drive circuit. Considering the cost and volume ap...

Claims

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Application Information

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