A Novel Multi Carrier PWM Based Harmonic Mitigation of Multi Level PV Inverter with Grid Integration

Present paper tells about the enhanced PWM method for a five level transformer with fewer grids connected and standalone diode clamped multilevel inverter (DCMLI) for reducing the leakage current magnitude. Here we use 2 modified reference waves with improved PWM approach's for producing five level inverter output terminals by gaining the enhanced PWM approach uses single triangle wave. Here to decrease the total harmonic distortion (THD) in the grid current we develop the harmonics to multiple carrier frequencies. The inverter terminals are diminished when the harmonics are shifted to higher order according to the size of the required filter. To synthesize the five level ac output, just 24 power semiconductor switches are required and other six are operated at line frequency so that it diminishes the switching loss and also the system total cost to handle power imbalance among PV sources for every phase of 3-phase inverter to employ a new modulation strategy in its regulation. So the grid connected 5-level multi string inverter gives some interesting results using grid integration.