Optimization of LCL filter and controller parameters for grid-connected converter adopting differential evolution (DE) algorithm

The optimized design procedure of the LCL-filter for grid-connected inverter based on the differential-evolution algorithm is presented. A combination of partial direct-pole-placement and differential evolution algorithm is also adopted to determine the basic parameters of the proportional-resonant controller to achieve effective resonance damping for the inverter. The concept is validated through simulation in Matlab-Simulink environment at 50-kW power level. In order to verify the design procedure and functionality of the concept, a hardware demonstrator is presented with measuremental results.