Design and Switching Loss Calculation of Single Leg 3-Level 3-Phase VSI

This article gives, a clear idea on the design, switching and conduction loss calculation of 3-level Voltage Source Inverter (VSI) for solar photo-voltaic (PV) 25KV distribution grid connected application. The major focus is on the inverter power variation with respect to the grid frequency. In this single leg inverter one phase consists of three half bridge Insulated Gate Bipolar Transistor (IGBT) modules and remaining two phases consist of two half bridge modules. Zeta converter is used to decrease or increase the input voltage and it is used for the power factor correction of distribution grid. Zeta converter output is given to 3-level VSI to convert DC-AC. The inverter output is connected to 500KW distribution grid. Perturb and observe (P&O) Maximum Power Point Tracking (MPPT) algorithm is used to eliminate the voltage and current sensors for switching of Zeta converter and it is used to achieve the maximum output power from the solar PV panel.