DC solid state transformer and control method thereof

A technology of solid-state transformers and converters, which is applied in the direction of converting DC power input to DC power output, control/regulation systems, instruments, etc., and can solve problems such as the inability to realize DC voltage conversion.

Active Publication Date: 2017-11-07
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As the basic equipment of the power system, the traditional power transformer cannot realize DC voltage conversion

Method used

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  • DC solid state transformer and control method thereof
  • DC solid state transformer and control method thereof
  • DC solid state transformer and control method thereof

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Embodiment Construction

[0026] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0027] like figure 1 As shown, a DC solid-state transformer is characterized in that it includes a filter inductor 100, a plurality of half-bridge sub-modules 200 and a plurality of DC-DC isolated converters 300, and the DC input of a plurality of half-bridge sub-modules 200 cascaded The positive pole of the terminal is connected to the positive pole of the medium-voltage DC grid after the filter inductor 100 is connected in series, the negative pole of the DC input terminal after cascading multiple half-bridge sub-modules 200 is connected to the negative pole of the medium-voltage DC grid, and multiple DC-DC isolated converters 300 The DC output side of each DC-DC isolated converter 300 is connected in parallel to form a DC output port, and the DC output port is connected to a low-voltage DC grid or load, and the DC input side of each DC-DC isolated converter 300 fo...

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PUM

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Abstract

The invention discloses a DC solid state transformer and a control method thereof; the DC solid state transformer comprises a filter inductor, a plurality of half-bridge submodules, and a plurality of DC-DC isolated form converters; the plurality of half-bridge submodules are mutually cascaded and connected in series with the filter inductor in a middle voltage DC power grid; the output end of each the half-bridge submodule is connected with the DC input end of each DC-DC isolated form converter; all DC output ends of the DC-DC isolated form converters are connected in parallel, and connected with a low voltage DC power grid or a load. The DC solid state transformer can real time calculate the operation numbers of the half-bridge submodules and the DC-DC isolated form converters according to a middle voltage DC power grid voltage and the DC solid state transformer real operation power, and the resting half-bridge submodules and the DC-DC isolated form converters can remain in a hot standby state, thus realizing the whole machine high efficiency operations.

Description

technical field [0001] The invention belongs to the technical field of power electronics applications, and relates to a DC power grid and a solid-state transformer, in particular to a DC solid-state transformer and a control method thereof. Background technique [0002] With the rapid development of the economy, fossil fuels are depleting day by day, which makes the application of new energy develop rapidly. Most of the new energy sources, such as photovoltaics and fuel cells, generate DC power. At the same time, DC power generation, transmission and distribution are an important direction of power technology innovation today, making DC transmission, DC distribution network and micro-grid and other fields gradually Entering the field of vision of everyone's research, it can be predicted that the DC power grid will be the future development trend. [0003] As the basic equipment of the power system, the traditional power transformer cannot realize DC voltage conversion. In ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M3/155
CPCH02M3/155H02M3/33569H02M1/007
Inventor 徐德鸿翁浩源施科研
Owner ZHEJIANG UNIV
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