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Direct current-direct current solid-state transformer

A solid-state transformer and DC voltage technology, applied in the field of transformers, can solve the problems of inability to realize the conversion of high, medium and low voltage levels, large volume and weight, etc., and achieve the effect of convenient maintenance and redundant design, small size and light weight

Active Publication Date: 2015-11-25
CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] One of the objectives of the present invention is to provide a DC-DC solid-state transformer to solve the technical problem that the power tapping device in the existing high-voltage direct current transmission system has a large volume and weight and cannot realize the conversion of high, medium and low voltage levels

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Embodiment Construction

[0052] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and examples, so as to fully understand and implement the process of how to apply technical means to solve technical problems and achieve technical effects in the present invention. It should be noted that, as long as there is no conflict, each embodiment and each feature in each embodiment of the present invention can be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.

[0053] An embodiment of the present invention provides a DC-DC solid-state transformer, such as figure 1 As shown, the transformer consists of:

[0054] The first MMC converter valve 1, one end of the first MMC converter valve 1 is a DC input end. The first MMC converter valve 1 inverts the DC voltage input from the DC input terminal into a first AC voltage and outputs it to the transformer unit 2 . The in...

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Abstract

The invention discloses a direct current-direct current solid-state transformer, which belongs to the technical field of transformers and solves the technical problems that a power tapping device in an existing high-voltage direct current transmission system is large and heavy and cannot convert high, medium and low voltage levels. The direct current-direct current solid-state transformer comprises a first MMC (Modular Multilevel Converter) valve, a transformer unit and a second MMC valve, wherein one end of the first MMC valve is a direct current input end, and the first MMC valve is used for converting a direct current voltage input by the direct current input end into a first alternating current voltage and then outputting the first alternating current voltage; the input of the transformer unit is connected with the output of the first MMC valve, and the transformer unit is used for transforming the amplitude of the first alternating current voltage output by the first MMC valve to a second alternating current voltage and outputting the second alternating current voltage; and one end of the second MMC valve is connected with the transformer unit, the other end of the second MMC valve is a direct current output end, and the second MMC valve is used for rectifying the second alternating current voltage into a direct current voltage and then outputting the direct current voltage from the direct current output end.

Description

technical field [0001] The invention relates to the technical field of transformers, in particular to a DC-DC solid-state transformer. Background technique [0002] High-voltage direct current transmission (HVDC) technology is usually used to transmit high-power electric energy from long-distance power plants to electrical equipment. The transmission lines used for transmission are usually overhead lines or submarine cables. Compared with traditional AC transmission systems, high-voltage direct current transmission The system cost is lower and the efficiency is higher. [0003] In the HVDC transmission system, there are often situations where two DC networks with different voltage levels need to be interconnected, or near the line of the HVDC system, it is necessary to transmit the main network power to the DC network along the line. In AC transmission systems, power can be tapped to loads by loading power transformers on power transmission lines. However, for high-voltage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
Inventor 冯江华张志学黄子昊刘华东南永辉张定华尚敬梅文庆张朝阳
Owner CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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