Dual-mode combination control method for multi-inverter system based on double-split transformer

A double-split transformer and multi-inverter technology, applied in the direction of reducing/preventing power oscillation, AC network circuits, electrical components, etc., to achieve the effect of increasing stability margin, improving stability, and improving grid-connected stability
CN111769591BActive Publication Date: 2022-04-08HEFEI UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HEFEI UNIV OF TECH
Publication Date
2022-04-08

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Abstract

The invention discloses a dual-mode combined control method for a multi-inverter system based on a double-split transformer, and belongs to the field of electrical engineering. The present invention proposes a dual-mode combined control method for a multi-inverter system based on a double-split transformer for an extremely weak power grid. The equivalent grid impedance of the public coupling point of the transformer, and gradually increases according to the equivalent grid impedance, the system runs in the full current source mode, the mixed mode and the full voltage source mode in turn, thereby effectively improving the multi-inverter based on the double-split transformer. The stability of the system in the case of changes in the strength of the power grid. The invention is not only simple to implement, but also greatly increases the stability margin of the multi-inverter system based on double-split transformers when the grid impedance fluctuates greatly, especially ensures that the system can still operate stably under extremely weak grids, and improves the grid adaptability of the system sex.
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Description

technical field

[0001] The invention relates to a control method for a multi-inverter system based on a double-split transformer, in particular to a dual-mode combined control method for a multi-inverter system based on a double-split transformer, and belongs to the field of electrical engineering. Background technique

[0002] At present, the development and use of renewable new energy such as wind energy and solar energy has been continuously increasing around the world. In particular, China, the United States and India have built and put into operation large-scale desert photovoltaic power plants above MW level, and the penetration rate of new energy power generation is getting higher and higher. . Moreover, for desert power stations with open sites, the structure of the centralized photovoltaic power generation system has the characteristics of simplicity, high efficiency, and easy maintenance, and has been widely used. In addition, the connection between photovoltaic g...

Claims

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