Study and Implementation of a Three-Phase Three-Level T-Type Inverter with Fault Ride Through Capabilities

The grid-tied three-phase three-level T-type inverter provides the required active and reactive power under frequency and voltage fault ride-through conditions by using dq frame technique. A digital signal processor TMS320F28335 is used to implement a three-phase three-level T-type inverter with an input dc bus voltage of 800 V, grid voltage of 220 Vrms / 60 Hz, switching frequency of 40 kHz, and the rated apparent power of 20 kVA. Under the rated power condition, the lowest THDi of 3% is achieved with the efficiency of 98.3%. The maximum efficiency is 98.4% under the output power of 16 kW conditions.