Application of partial direct-pole-placement and differential evolution algorithm to optimize controller and LCL filter design for grid-tied inverter

In this paper differential evolution algorithm has been adopted to identify a suitable set of values of L-C-L filter used in a grid-tied voltage source inverter to meet total harmonic distortion (THD) requirement. A single-phase circuit model with virtual equivalent impedance of inverter output power was used to analyze total harmonic distortion. This paper also adopted a combination of partial direct-pole-placement and differential evolution algorithm to determine basic parameters of the proportional resonant controller for the inverter. To have effective damping, the real part of the complex pole of the closed-loop transfer function closest to imaginary axis is pre-set as one of objectives for differential evolution algorithm to identify. The validity of the optimized L-C-L and controller parameters and effectiveness of one-phase equivalent circuit for THD analysis have been verified by Matlab Simulink based platform.