A Modified Controller for Solar PV Grid Tied Multilevel Inverter

With the increased share of renewables in power generation grid tied multilevel Inverters find a greater use. The vector control scheme has been implemented in the reference frame rotating at synchronous speed based on the independent control of real and apparent flow of power from the inverter to the grid. The currents injected in to the grid are controlled with two current control loops, one for the direct axis and other for the quadrature axis. Here, a lag compensator is taken as a controller technique for grid interface inverter to mitigate the power quality issues. The Insulating Gate Bipolar Transistor has forms as semiconductor switch for the parallel connected Voltage Source Inverter. The switching control employs SPWM technique in which a high frequency carrier is modulates with sinusoidal wave of grid frequency. The mathematical model of the inverter and its operation for power quality improvement has been validate and represents by the simulation.