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A six-phase inverter high-power DC boost converter and its control method

A DC boost, high-power technology, applied in the direction of converting DC power input to DC power output, output power conversion devices, control/regulation systems, etc. The effect of low ripple and high transmission power

Active Publication Date: 2018-10-26
HUNAN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

However, series-parallel connection will introduce circulation and the need to increase redundancy to improve reliability

Method used

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  • A six-phase inverter high-power DC boost converter and its control method
  • A six-phase inverter high-power DC boost converter and its control method
  • A six-phase inverter high-power DC boost converter and its control method

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Embodiment Construction

[0016] see figure 1 , which is a specific application of the present invention in grid-connected photovoltaic power generation. As shown in the figure, the photovoltaic array can be regarded as a low-voltage and high-current DC source. In order to realize its grid connection, its electric energy must first be imported into the high-voltage DC bus. The invention provides an interface for importing its electric energy.

[0017] see figure 2 , the front-stage inverter bridge of the present invention inverts the DC voltage of two photovoltaic arrays into an asymmetrical six-phase AC with a phase difference of 15°, wherein the first three phases and the last three phases of the six phases are symmetrical and have a phase difference of 30°. The output power of each photovoltaic array is evenly distributed on the 6 bridge arms of the inverter bridge. The frequency and voltage of the six-phase alternating current are regulated by the control loop of the inverter bridge. The frequ...

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Abstract

The invention discloses a six-phase inverter high-power DC boost converter and its control method. The boost converter includes two pre-stage π-type CLC filter devices, two six-phase inverter bridges, two six-phase Transformer and two six-phase diode rectifier bridges; the six-phase inverter is composed of six switching bridge arms, which are divided into two groups, and the output voltage phase difference between the two groups is 30°; two six-phase inverters are paralleled Connection, the DC input side of the inverter is connected to the DC voltage source, and the two six-phase inverters are controlled to invert the DC side voltage into two sets of six-phase asymmetrical AC power with a phase difference of 15°, and the output voltage of the inverter is connected to the AC transformer to rise voltage; the output of the AC transformer is connected to a six-phase diode rectifier bridge, and two sets of diode rectifier bridges are connected in series, and the midpoint is led out to ground. The DC step-up device of the present invention has large capacity, high efficiency, and low DC ripple on the high-voltage output side, and has good application prospects in the field of DC power transmission.

Description

technical field [0001] The invention relates to a large-capacity, high-efficiency, low-ripple DC booster device, which can be used in the field of DC power transmission with renewable new energy sources, and can be used to boost the DC voltage output by large-scale photovoltaic power stations and wind farms. into the high-voltage DC bus for DC transmission. Background technique [0002] With the development of power electronics technology and the grid connection of a large number of renewable new energy sources, the advantages of direct current transmission have gradually emerged. Compared with AC transmission, DC transmission has technical and economic advantages in many fields, such as low line cost, small transmission loss, and high power supply reliability. There are only two lines for direct current transmission, which requires less construction costs, and the loss under the same power transmission condition is much smaller than that of alternating current. At the same...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335H02J1/10
CPCH02J1/10H02M3/3353H02M1/0077
Inventor 罗安马伏军贺西何志兴徐千鸣易伟浪
Owner HUNAN UNIV
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