Modularized multi-level flexible DC (Direct Current) topology circuit applicable to fault ride-through

Abstract

The invention provides a modularized multi-level flexible DC (Direct Current) topology circuit applicable to fault ride-through. The topology circuit comprises a modular cascade circuit, a voltage switching circuit and a compensation circuit; after the modular cascade circuit is connected with the voltage switching circuit in parallel, the modular cascade circuit is serially connected with the compensation circuit. According to the modularized multi-level flexible DC topology circuit applicable to fault ride-through provided by the invention, the DC fault ride-through can be simply and effectively realized, therefore the modularized multi-level flexible DC topology circuit is applicable to the field of a high-voltage DC overhead line with high capacity.

Description

technical field [0001] The invention relates to a topology structure, in particular to a modular multilevel flexible DC topology circuit suitable for fault ride-through. Background technique [0002] The flexible direct current transmission system is a direct current transmission system based on a voltage source converter with a fully controlled device (IGBT) as the core. It has superior performance and good application scalability. And many other fields have broad application prospects. In recent years, modular multi-level flexible DC transmission technology has developed extremely rapidly. [0003] The flexible direct current transmission system is a direct current transmission system based on a voltage source converter with a fully controlled device (IGBT) as the core. It has superior performance and good application scalability. And many other fields have broad application prospects. In recent years, modular multi-level flexible DC transmission technology has developed ...

AI Technical Summary

Problems solved by technology

[0010] The new topology was proposed by D.R.TRAINER and others in the article "A New Hybrid Voltage-Sourced Converter for HVDC PowerTransmission" in 2010. The topology adopts a single-phase full-bridge structure and a half-bridge sub-module cascade structure in series-parallel connection to realize power transmission. , but it is difficult to achieve DC fault ride-through, and AC faults also need to be realized through complex control

[0011] The patent application number US2012 / 0069610A1 proposes patent requirements for this topology, and all the proposed topologies cannot effectively achieve DC fault ride-through, and it is difficult to achieve AC fault ride-through

Images