Investigation of level doubling network (LDN) integrated three-phase cascaded H-bridge (CHB) MLI configuration

This paper proposed a modular three-phase multilevel inverter configuration using level doubling network (LDN). This configuration doubles voltage levels in each phase, preserving modularity and without increasing the device count and ratings. Preserved modularity and switching redundancies of the configuration support inverter fault-tolerant ability. A simple control algorithm imposing a popular level-shifted carrier arrangement is used to implement the proposed configuration. Performance of the proposed configuration and PWM is analyzed and validated for multiple case studies in the Simulink environment using MATLAB.