Design of LCL filter for Grid-interfaced PV system based on Cost minimization

This paper proposes a novel approach to design the LCL filter for grid interfaced PV system. A cost based minimization approach on a cost per joule basis for each of the filter elements is explored to obtain the optimal filter design. Simulation results for a 10 KVA grid connected inverter with LCL filter are presented in order to verify the behavior of the proposed design. The impact of designed filter parameters on the ripple current is also discussed in the paper. The total inductance of the LCL filter is varied and filter parameter values which give lowest cost is identified while meeting harmonic standard requirements and the fundamental voltage drop across the filter.