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Submodule structure and MMC topology structure with AC-DC fault removing capability

A topology and fault clearing technology, applied in the direction of power transmission AC network, electrical components, emergency protection circuit devices, etc., can solve the problem of high cost

Inactive Publication Date: 2018-08-24
XUJI GRP +3
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a sub-module structure with the ability to clear AC and DC faults, so as to solve the problem of high cost in the way of adding an energy release device to the system to achieve AC and DC fault isolation

Method used

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  • Submodule structure and MMC topology structure with AC-DC fault removing capability

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Embodiment Construction

[0030] Example of MMC topology

[0031] First, combine Figure 1-a to Figure 1-c Explain the serious problems of MMC under the fault condition of MMC AC and DC side and the design principle of the patent of the present invention. Figure 1-a to Figure 1-c It is based on three typical topology diagrams of MMC direct current transmission system.

[0032] Existing typical system topologies based on MMC include MMC-MMC DC transmission system, multi-terminal MMC DC transmission system, LCC-MMC hybrid DC transmission system and so on. Among them, in the LCC-MMC hybrid DC transmission system, due to factors such as controller and communication, the electrical stress of the MMC is the most serious. The hybrid DC transmission system is used as an example to illustrate.

[0033] The topology of the LCC in the hybrid DC transmission system is the same as that of the thyristor rectifier in the conventional DC transmission system, and will not be repeated here. There are many forms of V...

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Abstract

The invention relates to a submodule structure and MMC topology structure with an AC-DC fault removing capability; two control switches are arranged; the first control switch is connected the submodule topology structure in parallel; the second control switch is connected in series on a connecting line between a voltage anode port or a voltage cathode port of the submodule and the submodule topology structure; when the submodule structure steadily operate, the first control switch is closed, and the second control switch is conducted; when the AC side has faults, the first control switch is triggered to conduct, and the fault current injected in the a MMC can be induced to the ground; when the DC side has faults, the second control switch is controlled to close. Therefore, the submodule structure can realize isolation of AC-DC faults, and can effectively reduce the voltage stress and current stress of the submodule power device. In addition, the scheme is the secondary design reconstruction of an existing submodule, and only small influences can be caused on existing valve tower and valve hall designs; the submodule structure and MMC topology structure is very low in cost, and simple in a realization process.

Description

technical field [0001] The invention relates to a sub-module structure and an MMC topology structure capable of clearing AC and DC faults. Background technique [0002] The second-generation flexible DC transmission technology modular multilevel voltage source converter (MMC) based on fully controlled power electronic devices has all the advantages of voltage source converters (VSC), and can independently control active and reactive power. Many advantages such as high power, no commutation failure, and power supply for passive islands are favored by academia and industry. For example, the Chinese patent application document with the application publication number CN107453635A discloses a modular multilevel converter topology, each bridge arm is formed by cascading several sub-modules. Each bridge arm of the MMC is composed of multiple sub-modules and bridge arm reactors in series. The core components of the sub-modules are fully-controlled power electronic devices and capac...

Claims

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Application Information

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IPC IPC(8): H02H7/26H02J3/36
CPCY02E60/60H02H7/268H02J3/36
Inventor 张军吴金龙王先为李道洋胡丁文牛翀姚为正
Owner XUJI GRP
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