A Novel Inverter Structure Resilient to Commutation Failure

A thyristor commutation module with controllable output voltage and adjustable impedance during commutation is proposed to comprehensively address the commutation failure issue in Line-Commuted Converter-based High Voltage Direct Current (LCC-HVDC) transmission systems. This module is cascaded to form a novel inverter topology that effectively resists commutation failure. Through analysis and validation in PSCAD/EMTDC, the results indicate that the proposed novel inverter not only completely resolves the commutation failure problem but also retains a specific power transmission capability during fault conditions. The parameter design method is deemed reasonable, and the stresses on the components of the commutation module are within the allowable design range.