I. Introduction
As renewable energy is becoming widely available, a lot of research is being studied on grid-connected inverters [1], [2]. The output filter of a voltage source inverter is mainly an L filter (using single inductor) or LCL filter (using two inductors and capacitor). Although the L filter uses only one inductor per phase, large inductance is required to sufficiently attenuate the switching frequency components. Therefore, system becomes heavy and bulky.