Experimental validation of a fault diagnostic method in SPWM and SVPWM CHB-MLIs

Effective and systematic fault diagnostic measure is demanded by the consistent operation of the multilevel inverter systems (MLIs). This research work explores the open-circuit (OC) fault diagnosis associated with cascaded H-bridge (CHB) MLIs. Here, a diagnostic scheme is proposed centered on the bridge voltages as the diagnostic parameter. In order to authenticate the scheme, experimental validations of the proposed method are carried out on multicarrier-sinusoidal and space vector modulated symmetric CHB-MLIs. The outcomes prove the validity of the presented FDD scheme in identifying and locating the fault in both sinusoidal and space vector modulated symmetric CHB-MLIs.