Topological structure of double-clamping subunit and converter

Abstract

The invention relates to a topological structure of a double-clamping subunit and a converter. The topological structure comprises an upper clamping module, a lower clamping module, a first guiding switch tube, a second guiding switch tube, a bypass switch T1 and a bypass switch T2. The topological structure of the double-clamping subunit is capable of reducing the overcurrent risk of the guidingswitch tubes; and when one clamping module is seriously faulted, the other clamping module can work continuously, so as to ensure the stable system operation, facilitating the independent separation of the upper clamping module and the lower clamping module, and providing convenience for large-scale production and application.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to a topology structure of a double-clamp subunit and a converter. Background technique [0002] DC short-circuit fault is a common fault in MMC-HVDC systems and flexible substations. It is currently the most widely used method to clear the DC short-circuit fault current through the control of the converter itself. [0003] At present, the double-clamp sub-module structure is mainly used in engineering to realize the self-clearing of faults. Its topology is as follows: figure 1 As shown, including five switches, two diodes and two capacitors. At this stage, in order to meet the requirements of modularization in the project, the upper and lower clamp modules need to be separated independently in terms of structure and secondary power supply. This structure affects the symmetry of the upper clamp and lower clamp subunits, and the drive circuit is in the secondary There are also cont...

AI Technical Summary

Problems solved by technology

At this stage, in order to meet the requirements of modularization in the project, the upper and lower clamp modules need to be separated independently in terms of structure and secondary power supply. This structure affects the symmetry of the upper clamp and lower clamp subunits, and the drive circuit is in the secondary There is also a contradiction in power supply

If the control of any sub-unit in the upper clamping sub-unit or the lower clamping sub-unit fails, the IGBT cannot guarantee the power supply, which will destroy the current path of the entire MMC converter, thus affecting the normal operation of the entire MMC converter

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