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DC solid-state transformer

A technology of solid-state transformer and DC conversion unit, which is applied in the direction of converting DC power input to DC power output, instruments, AC power input to DC power output, etc. It can solve the problems of self-loss and high cost, and achieve self-loss and cost. higher effect

Inactive Publication Date: 2019-04-09
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention proposes a DC solid-state transformer in order to solve the problem of high self-loss and high cost of the existing DC solid-state transformer due to the large voltage stress of the switching device on the high-voltage side

Method used

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Embodiment

[0049] Example: Combine below Figure 1 to Figure 9 This embodiment will be described in detail.

[0050] The DC solid-state transformer in this embodiment includes a filter inductor L 1 , Filter inductor L 2 And the first to Nth power modules having the same circuit structure;

[0051] Each power module includes a front-stage DC conversion unit and an intermediate frequency isolation conversion unit. The front-stage DC conversion unit and the intermediate frequency isolation conversion unit are cascaded. Each intermediate frequency isolation conversion unit includes an inverter sub-unit. The inverter sub-unit uses a midpoint Clamped half-bridge three-level inverter to achieve;

[0052] The front-stage DC conversion unit of the first power module to the front-stage DC conversion unit of the Nth power module are respectively the first front-stage DC conversion unit to the N-th front-stage DC conversion unit;

[0053] The intermediate frequency isolation conversion unit of the first po...

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Abstract

A DC solid-state transformer belongs to the field of DC power transmission and distribution, and the problems of relatively high loss and relatively high cost of an existing DC solid-state transformercaused by relatively large voltage stress of a switch device at a high-voltage side are solved. In the DC solid-state transformer, each power module comprises a front-stage DC conversion unit and anintermediate-frequency isolation conversion unit which are cascaded, wherein the intermediate-frequency isolation conversion unit comprises an inversion sub-unit which is implemented by a middle-pointclamping half-bridge three-level inverter, N front-stage DC conversion units are connected in series to form a front-stage DC conversion series unit, a positive DC input end of the series unit is connected with a positive electrode of an intermediate-voltage DC power grid by a filtering inductor L1, a negative DC input end of the series unit is connected with a negative electrode of the intermediate-voltage DC power grid by a filtering inductor L2, and a low-voltage DC power grid of a load is connected in series between a public end of a positive DC output end of the intermediate-frequency isolation conversion unit and a public end of a negative DC output end of the N intermediate-frequency isolation conversion unit.

Description

Technical field [0001] The invention relates to a direct current transformer, which belongs to the field of direct current transmission and distribution. Background technique [0002] In recent years, with the rapid development of DC transmission and distribution technology, DC solid-state transformers have played an increasingly important role in the grid connection of distributed power sources and the energy conversion and management of DC distribution networks. With the withstand voltage level of the existing power devices, in order to realize the DC conversion between the medium and high voltage DC grid (above 10kV) and the low voltage DC grid, the use of modular series-parallel technology is an effective solution. [0003] Regarding direct current solid-state transformers for direct current transmission and distribution, there have been some reports in recent years. For example, the Chinese patent with authorization announcement number CN 105743353 B discloses a solid-state tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M3/155H02M7/487H02M7/5387H02M1/32
CPCH02M1/32H02M3/155H02M3/33569H02M7/487H02M7/5387H02M1/325
Inventor 李彬彬赵晓东张书鑫程达毛舒凯付勤天徐殿国
Owner HARBIN INST OF TECH
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