a single-phase grid-tied pv based trans-z-source inverter utilizing lcl filter and grid side current active damping

As grid-connected photovoltaic (pv) based inverters are being used more, these systems play a more important role in the electricity generation by distributed power generators. power injection to the grid needs to meet predefined standards. in this work, a pv based inverter consists of a trans-z-source network performing as dcdc power conversion level, is connected to the grid through a lcl filter. the connection through an lcl filter offers certain advantages, but it also brings the disadvantage of having a resonance frequency. a systematic mathematical design procedure for pr controller parameters along with active damping factor is presented and the overall control system leads to a considerably low value of grid current thd. meanwhile the maximum power point tracking (mppt) of the pv arrays is obtained by a modified inc method. simulations in various conditions are carried out in matlab/simulink environment and results depict suitable performance of the system with designed parameters.