Dual-port Half-bridge MMC Sub-module with DC Fault Clearing Capability
The half bridge modular multi-level converter cannot clear DC side faults by itself,by improving the sub module topology,the self-clearing function of fault current can be achieved.On the basis of half bridge,a dual port half bridge submodule with DC fault blocking capability was proposed,which had negative level output capability and can output twice the level of the full bridge when using the same scale switching devices.A simulation model was built based on MATLAB/Simulink for verification.The results show that the proposed submodule has good fault current blocking ability with multiple output levels,and can significantly improve the voltage output quality.
flexible direct current transmissionmodular multilevel converters(MMC)direct current faultsub-module topologytotal harmonics distortion
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