Harmonic-compensation based control of a nonlinear differential-mode Ćuk inverter

There are different topologies for realization of the inverter. The differential-mode Ćuk 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 micro-inverters. The voltage gain of the differential-mode Ćuk 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 3^rd, 5^th, 7^th, and 9^th order harmonic compensators yields voltage total-harmonic distortion (THD) less than 5% in standalone mode of operation with resistive load.