An Improved Five-Level Solar Photovoltaic System with Levenberg-Marquardt Algorithm based Specific Harmonics Curtailment

This paper uses Levenberg-Marquardt Algorithm (LMA) for calculation of the accurate angles from the initial guess to have new control for solar PV system. This algorithm provides a new approach towards the evaluation of switching angles from the desired harmonic curtail function. The obtained angles provide the minimization of specific harmonics for solar photovoltaic system. The specific harmonic elimination (SHE) method with LMA algorithm is presented to eliminate low order harmonic component. The obtained angles are further used for closed loop grid-tied control of magnetically linked five-level CHB-PV topology. A lesser harmonic converter voltage is achieved and system is tested in intermittent solar profile. Results on computer simulation and hardware test bench showcase the effectiveness of the presented concept for improved control of solar multilevel inverters.