Harmonic-Compensation based Control of a Nonlinear Differential-Mode Cuk Inverter

There are different topologies for realization of the inverter. The differential-mode Cuk inverter, with features such as reduced number of devices, reduced power dissipation, and reduced ripple on the both the ac and the dc sides is a good candidate for renewable-energy applications and microinverters. The voltage gain of the differential-mode Cuk inverter is nonlinear for which compensation scheme needs to be appropriately designed. This paper shows that, a proportional-resonant (PR) harmonic compensator can be used to control this nonlinear inverter. Experimental results of the inverter using 3rd, 5th, 7th, and 9th order harmonic compensators yields voltage total-harmonic distortion (THD) less than 5% in standalone mode of operation with resistive load.