Power decoupling method for single phase PV system using Ćuk derived micro-inverter

Power decoupling is required to balance the difference between constant power at PV side and double frequency pulsating power at load side in single phase AC system. The balance power is generally handled by circuit passives. This paper proposes decoupled power control for grid connected PV systems using an embedded decoupling capacitor in a doubly grounded boost buck (Ćuk) derived micro inverter. The method ensures smaller size of PV terminal capacitor, absence of transformer and also removes the potential hazard to humans in contact with the PV array. Simulation and experimental both result verify the circuit operation and analysis.