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Direct current transformer device used for power distribution

A technology of DC transformer and high-frequency transformer is applied in the direction of adjusting electrical variables, converting DC power input into DC power output, output power conversion device, etc. It can solve problems such as limiting the development and promotion of DC power distribution, and achieve redundant design. Simple and feasible, simple and flexible control, the effect of reducing switching loss

Inactive Publication Date: 2015-04-01
ZHEJIANG UNIV
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  • Claims
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AI Technical Summary

Problems solved by technology

However, limited by the development level of power electronic devices, there is still no mature solution that can effectively realize the energy interaction between the medium-voltage DC distribution network and the low-voltage DC micro-grid, and achieve electrical isolation, which limits the development of DC power distribution. and promotion

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  • Direct current transformer device used for power distribution
  • Direct current transformer device used for power distribution
  • Direct current transformer device used for power distribution

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Embodiment Construction

[0039] First of all, it needs to be explained that the high voltage in the present invention refers to a voltage level greater than 100kV, the medium and high voltage refers to a voltage level between 10kV and 100kV, the low voltage refers to a voltage level less than 1kV, and the high frequency refers to a voltage level above several hundred Hz. . In addition, the high-voltage side in this article is relative to the low-voltage side, not for a specific voltage level. Those skilled in the art can clearly recognize these concepts under the specific application environment of the present invention, and there will be no problems of ignorance or unclearness.

[0040] The invention proposes a converter device for realizing high-efficiency interfaces between different power grids in a DC power distribution network, including a power electronic converter valve, a high-frequency isolation transformer, a control circuit and a drive circuit. The power electronic converter valve is comp...

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Abstract

The invention relates to the technical field of power electronics converters, and aims to provide a direct current transformer device used for power distribution. The device comprises a high-frequency transformer, a high-voltage side converter valve and a low-voltage side converter valve, wherein the input side of the high-voltage side converter valve is directly connected with a middle-high-voltage direct current power grid, and the output side of the high-voltage side converter valve is connected with a primary side winding of the high-frequency transformer; the input side of the low-voltage side converter valve is connected with the primary side winding of the high-frequency transformer, and the output side of the low-voltage side converter valve is connected with a low-voltage direct current power grid or an energy storage system. The input sides and the output sides of the direct current transformer device are subjected to high-frequency isolation, a heavy low-frequency transformer is omitted, voltage can achieve a high level due to a modularization design, the cost is lowered, meanwhile, a redundancy design becomes simple and feasible, and the system can be repaired without outage; the switching loss of the device can be lowered by a phase shift control structure to enable the efficiency of the converter to be high; the energy of the direct current transformer system can carry out bidirectional flowing; the whole direct current transformer system has the advantages of simpleness and flexibility in control, efficiency and reliability.

Description

technical field [0001] The invention relates to the technical field of DC power distribution and power electronic converters, in particular to a DC transformer device for power distribution that can realize high-frequency isolation, high-voltage DC input, and low-voltage DC voltage output, and simultaneously realize bidirectional flow of energy. Background technique [0002] The development and utilization of clean energy, especially the application of renewable energy represented by wind energy and solar energy, has become an important measure for countries around the world to cope with climate change, protect the environment, and achieve sustainable development. In order to adapt to the important development trend of renewable energy power generation, micro-grid technology and smart grid technology based on distributed power generation have been developed rapidly. [0003] Compared with the AC microgrid, the DC microgrid is more convenient for new energy access, and the en...

Claims

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Application Information

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IPC IPC(8): H02M3/335H02M1/14
CPCH02M1/14H02M3/33584H02M1/007
Inventor 王朝辉张军明
Owner ZHEJIANG UNIV
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