Ripple analyze and design considerations for an interleaved boost converter (IBC) for a PV source

Abstract

This paper approaches the interleaved boost converter (IBC) for photovoltaic systems (PVS) with efficiency control. The purpose of this converter is to transfer the low DC PV voltage to a high DC voltage at its output. The low output voltage ripple and especially the low input current ripple (for MPPT) are analyzed, verified and compared to N cell IBCs. To improve the efficiency of the IBC, the control decides how many commutation cells are used, in relation to the actual power. This paper also shows to determine the critical PV current needed to work in continuous conduction mode. Finally, a dual IBC is experimental tested to verify the theoretically approaches.