LCL Control system for grid-connected inverter with LCL-filter

摘要

The present invention relates to a control system of a LCL filter application grid interconnecting inverter. The control system of the LCL filter application grid inverter according to the present invention receives the DC voltage from the DC power supply and converts it into an AC voltage for connection to the grid power system and controls the on / An inverter for performing power synchronization with the grid power system by operation; A first inductor connected between an output terminal of the inverter and a second inductor connected to an input terminal of the grid power system and a second inductor connected between the output terminal of the inverter and the grid power system for attenuating harmonics mixed in the AC voltage output from the inverter, An LCL filter unit having a capacitor connected between the first inductor and the second inductor; And Input to the grid power system And outputs a control signal for controlling the inverter by processing the current feedback The control unit includes a current controller for feedback processing the current input to the grid power system and outputting the q-axis and d-axis reference voltages, respectively, in order to reduce the adverse effects due to distorted grid voltage and parameter changes .