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Flexible HVDC DC/DC Converter with Fault Blocking Capability

A flexible DC power transmission and converter technology, which is applied in the direction of converting DC power input to DC power output, adjusting electrical variables, and power transmission AC networks. It can solve problems such as high cost, large volume, and lack of fault tolerance, and achieve low cost, The effect of small size and failure handling avoidance

Active Publication Date: 2021-03-23
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of high cost, large volume, lack of fault tolerance and fault blocking in existing non-isolated high-voltage DC / DC converters, the present invention provides a flexible direct current transmission DC / DC converter with fault blocking capability

Method used

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  • Flexible HVDC DC/DC Converter with Fault Blocking Capability
  • Flexible HVDC DC/DC Converter with Fault Blocking Capability
  • Flexible HVDC DC/DC Converter with Fault Blocking Capability

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Embodiment Construction

[0027] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings, but it is not limited thereto. Any modification or equivalent replacement of the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention should be covered by the present invention. within the scope of protection.

[0028] The present invention provides a flexible direct current transmission DC / DC converter with fault blocking capability, such as figure 1 As shown, the direct current transmission DC / DC converter includes a thyristor string T11, a thyristor string T12, a thyristor string T21, a thyristor string T22, a half-bridge sub-module string, and an inductor L, wherein:

[0029] The circuit structures of the thyristor string T11, thyristor string T12, thyristor string T21, and thyristor string T22 are all the same, and each thyristor string includes a pluralit...

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Abstract

The invention discloses a flexible direct current transmission DC / DC converter with fault blocking capability and a fault protection method thereof. The flexible direct current transmission DC / DC converter includes a thyristor string T11, a thyristor string T12, a thyristor string T21, a thyristor String T22, half-bridge sub-module string, inductance L, the half-bridge sub-module string includes half-bridge sub-module SM1 ~ half-bridge sub-module SMN; thyristor string T11 and T21 are connected in reverse parallel, respectively connected to the positive pole of the DC low-voltage side and the half-bridge sub-module The input stage of SM1 is connected; the thyristor strings T12 and T22 are connected in antiparallel, respectively connected to the positive pole of the DC high voltage side and the input stage of the half-bridge sub-module SM1; the current output terminal of the half-bridge sub-module SMN is connected to the first end of the inductor L; the inductor The second end of L is connected to the negative pole of the DC low-voltage side and the negative pole of the DC high-voltage side at the same time. The invention solves the problem that the existing non-isolated high-voltage DC / DC converter lacks fault tolerance and fault handling.

Description

technical field [0001] The invention belongs to the field of flexible direct current transmission and relates to a flexible direct current transmission DC / DC converter with fault blocking capability. Background technique [0002] Since HVDC transmission has lower losses than AC transmission over long distances, underground or underwater, hundreds of HVDC transmission projects have been installed around the world so far. Especially based on the emergence of modular multilevel voltage source converter technology, flexible DC transmission has been widely used in the integration of offshore wind farms and the interconnection of asynchronous AC systems. [0003] The researchers used a modular multilevel DC converter to make the modular multilevel converter directly output DC voltage to form a non-isolated DC / DC converter with a single-stage circuit structure. This type of DC / DC converter can save the inevitable AC transformer of the isolated DC / DC converter. However, in order t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/142H02J3/36H02H7/26
CPCH02H7/268H02J3/36H02M3/142H02M1/007Y02E60/60
Inventor 李彬彬张玉洁赵晓东张书鑫徐梓高徐殿国
Owner HARBIN INST OF TECH