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Modular multilevel converter and sub-module for direct current fault blocking

A DC fault and sub-module technology, applied in the output power conversion device, the conversion of AC power input to DC power output, electrical components, etc. Weak capacity and other problems, to achieve the effect of quickly clearing forward and reverse DC faults and reducing costs

Active Publication Date: 2020-05-08
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

like figure 1 As shown, the prior art discloses a diode-clamped reverse-resistance dual sub-module structure (D-RBSM), which reduces the simultaneity requirement of RB-IGBT locking and can effectively block the DC side fault current, but its reverse resistance The ability to break the fault current is weaker than that of the forward

Method used

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  • Modular multilevel converter and sub-module for direct current fault blocking
  • Modular multilevel converter and sub-module for direct current fault blocking
  • Modular multilevel converter and sub-module for direct current fault blocking

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Embodiment Construction

[0034] Below in conjunction with the appendix of the present invention Figure 2-13 , clearly and completely describe the technical solutions in the embodiments of the present invention, obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0035] refer to figure 2 , a DC fault blocking sub-module, including a half-bridge unit, a third IGBT T3, a fourth IGBT T4, a fifth IGBT T5, a tenth current blocking transistor The diode D10, the second clamping capacitor C2 and the ninth blocking diode D9. A third blocking diode D3 is connected in reverse parallel to the third IGBT T3, the emitter e of the third IGBT T3 and the collector c of the fourth IGBT T4 are both connected to half-bridge unit connection. The co...

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Abstract

The invention relates to the technical field of high-voltage direct current transmission, and discloses a modular multilevel converter for direct current fault blocking and submodules, wherein a modular multilevel converter for direct current fault blocking includes multiple A bridge arm, a plurality of bridge arms all include a plurality of half-bridge sub-modules connected in series and a plurality of enhanced capacitor clamp sub-modules, using the capacitor clamp function and the reverse cut-off characteristic of the diode, a DC fault blocking device of the present invention The modular multilevel converter and its sub-modules have the ability to clear DC faults, and have the advantage of quickly clearing forward and reverse DC faults.

Description

technical field [0001] The invention relates to the technical field of high-voltage direct current transmission, in particular to a modular multilevel converter and a submodule for blocking direct current faults. Background technique [0002] Modular multilevel converter based high voltage direct current (MMC-HVDC) is an important method to solve the problem of asynchronous networking in traditional power grids, and it is also a key technology for the development of smart grids. Compared with traditional DC technology, it has the advantages of modular design, power supply to passive network, and improved AC system stability. It shows good research prospects. In recent years, it has been deeply studied and widely used. [0003] The sub-module topology determines the working efficiency and performance of the MMC. The commonly used topologies include half-bridge sub-module (HBSM), full-bridge sub-module (FBSM), and clamp sub-module (clamp double sub-module, CDSM) and enhanced ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483H02M1/32
CPCH02M1/32H02M7/483H02M1/325
Inventor 曾琦王渝红刘进飞陈勇
Owner SICHUAN UNIV
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