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Flexible direct current transmission DC/DC converter with fault blocking capacity

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: 2019-10-11
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 direct current transmission DC/DC converter with fault blocking capacity
  • Flexible direct current transmission DC/DC converter with fault blocking capacity
  • Flexible direct current transmission DC/DC converter with fault blocking capacity

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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 to this. 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 shall be covered by the present invention. In the scope of protection.

[0028] The 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, where:

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

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Abstract

The invention discloses a flexible direct current transmission DC / DC converter with a fault blocking capacity, and a fault protection method thereof. The flexible direct current transmission DC / DC converter comprises 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; the half-bridge sub-module string comprises a half-bridge sub-module SM1 to a half-bridge sub-module SMN; the thyristor strings T11 and T21 are reversely connected in parallel, and separately connected with the positive pole of the direct current low voltage side and the half-bridge sub-module SM1; the thyristor strings T12 and T22 are reversely connected in parallel, and separately connected with the positive pole of the direct current high voltage side and the input stage of the half-bridge sub-module SM1; the current output end of the half-bridge sub-module SMN is connected with one end of the inductor L; and the second end of the inductor L is synchronously connected with the negative pole of the direct current low voltage side and the negative pole of the direct current high voltage side. According to the flexible direct current transmission DC / DC converter provided by the invention, the s that the existing non-isolated high voltage DC / DC converter is lack of fault tolerance and fault treatment is solved.

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, so far, hundreds of HVDC transmission projects have been installed worldwide. Especially, based on the emergence of modular multilevel voltage source converter technology, flexible DC transmission has been widely used in offshore wind farm integration and non-synchronous AC system interconnection. [0003] Researchers use modular multi-level DC converters to 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 eliminate the inevitable AC transformer of the isolated DC / DC converter. However, in order to maintain the stability of the capacitor voltage of the upper...

Claims

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Application Information

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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