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A mixed-level three-phase four-leg converter device and control method

A technology of three-phase four-leg and converter, which is applied in the direction of output power conversion device, AC power input conversion to DC power output, electrical components, etc. Volatility, large amount of calculation and other issues

Active Publication Date: 2018-10-16
中科海奥(黄山)储能科技有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the limitations of the above-mentioned various technical solutions, and to provide a mixed-level three-phase Four-leg converter device and control method

Method used

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  • A mixed-level three-phase four-leg converter device and control method
  • A mixed-level three-phase four-leg converter device and control method
  • A mixed-level three-phase four-leg converter device and control method

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Embodiment Construction

[0082] The preferred modes of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0083] see figure 1 , The mixed-level three-phase four-leg converter device provided by the present invention includes: a DC part, a three-phase four-leg converter, and an output filter circuit. in:

[0084]The DC part includes two voltage-dividing capacitors C1 and C2, the two voltage-dividing capacitors C1 and C2 are connected in series with each other, the series connection point is 0, and the two voltage-dividing capacitors C1 and C2 are connected in series with the DC source output;

[0085] The three-phase four bridge arms include three-phase three-level three bridge arms and N-phase two-level fourth bridge arms; the three-phase three-level three bridge arms are A-phase, B-phase and C-phase three-phase The flat three bridge arms include three parallel T-shaped three-level bridge arms, and the center points of the three T-shaped ...

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Abstract

The invention discloses a hybrid level three-phase four-bridge arm converter device and control method. First, a hybrid level-based three-phase four-bridge arm converter, bridge arms of phases A, B and C are of a T-shaped three-level structure, the fourth bridge arm is of a two-level structure, the topological structure can reduce the number of switching tubes and the number of diodes, the efficiency is relatively high, and the cost is reduced; the direct current side voltage utilization rate can be improved, and the hybrid level-based three-phase four-bridge arm converter has good output voltage performance under zero sequence and negative sequence unbalanced load conditions, the voltage unbalance degree is relatively low, and the midpoint balance fluctuation is reduced; and a method for controlling a virtual synchronous generator is disclosed based on the converter device, and a hybrid level three-phase four-bridge arm equivalent vector modulation algorithm is adopted, thereby greatly simplifying the modulation algorithm, reducing the calculation amount, and improving the overall performance.

Description

technical field [0001] The invention relates to a three-phase four-leg converter device and a control method, in particular to a mixed-level three-phase four-leg converter device and a control method. Background technique [0002] In recent years, as the penetration rate of new energy power generation units in the power system continues to increase, its role in the power grid will continue to change. New energy power generation units need not only provide power to the power grid, but also need to be able to support the power grid or network operation . When running off-grid, the three-phase load often runs under the condition of load asymmetry. At this time, how to control the unbalance of the three-phase voltage becomes a key issue. Compared with the traditional three-phase bridge structure, the three-phase four-leg structure has better unbalanced operation capability, so it has become a research hotspot. Aiming at the topological structure and control method of the three...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5387H02M7/5395H02M1/12H02J3/38
CPCH02J3/38H02M1/126H02M7/53873H02M7/5395
Inventor 刘芳张杰王付胜洪剑峰李飞张兴赵文广
Owner 中科海奥(黄山)储能科技有限公司
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