Conventional hybrid PV-Battery converters encounter several challenges in power management, power density and polluted grid when interfaced with residential electrical system. In response to these challenges this paper proposes an electrolytic capacitor less non-isolated microinverter with integrated battery storage system converter. Both MPPT function for PV along with charge/discharge controller function for storage battery is enabled by the power sharing unit. This unit is followed by a two-stage twin DC-DC interleaved modular multilevel converter (IMMC) units to boost the PV/battery output to 400VDC. Furthermore, due to 180 degrees phase shift control and symmetry of upper and lower half of DC-DC IMMC units voltage ripple is cancelled. The inverter stage has a embedded active decoupling stage to eliminate twice the line frequency ripple in the dc link capacitor. This function along with the 180-degree phase shift control of the DC-DC IMMC units allows to replace the electrolytic dc link capacitor with compact, efficient, reliable film capacitor. Nonlinear and linear loads were examined in the analysis. Experimental and simulation results are presented to validate the concept.
