N-output three-phase 3N+3-switch-group MMC inverter and control method of N-output three-phase 3N+3-switch-group MMC inverter

A switch group and inverter technology, applied in the direction of output power conversion device, AC power input conversion to DC power output, irreversible DC power input conversion to AC power output, etc., can solve the problems of increasing project costs, etc. Achieve the effect of solving pressure equalization problem, improving quality and reducing engineering cost

Active Publication Date: 2014-05-07
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • N-output three-phase 3N+3-switch-group MMC inverter and control method of N-output three-phase 3N+3-switch-group MMC inverter
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  • N-output three-phase 3N+3-switch-group MMC inverter and control method of N-output three-phase 3N+3-switch-group MMC inverter

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Embodiment Construction

[0020] 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.

[0021] refer to figure 1 , the N-output three-phase 3N+3 switch group MMC inverter of the present invention includes a DC power supply U dc , the first bridge arm, the second bridge arm, the third bridge arm, and N three-phase loads; 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 s...

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Abstract

The invention provides an N-output three-phase 3N+3-switch-group MMC inverter and a control method of the N-output three-phase 3N+3-switch-group MMC inverter. The inverter comprises a direct current power source, a first bridge arm, a second bridge arm, a third bridge arm and N three-phase loads. The three bridge arms are respectively formed by N+1 switch groups and two inductors in a series connection mode, and each switch group of each bridge arm is formed by n power switch units in a series connection mode. The three ends of the kth three-phase load are connected with the upper ends of the k+1th switch groups of the three bridge arms respectively, wherein the k ranges from 1 to N-1. The three ends of the Nth three-phase load are connected with the lower ends of the Nth switch groups of the three bridge arms. According to the inverter, carrier phase-shifting PWM control is adopted, N three-phase alternating currents with the 2n+1-level line voltages are output, the voltage stress borne by each switch tube in each MMC power switch unit is only 1 / n of the voltage stress of the direct current power source, and the inverter and the control method are suitable for high-voltage, high-power and three-phase alternating current double-load occasions.

Description

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

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48H02M7/539
Inventor 张波付坚丘东元
Owner SOUTH CHINA UNIV OF TECH
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