A half-bridge 1/spl Phi/2 W PV inverter system with active power filtering and real power injection

This paper presents a half-bridge single-phase two-wire (1Phi2W) PV inverter system, which can perform both active power filtering (APF) and real power injection (RPI). In the proposed system, it needs only two active switches, reducing cost significantly. In addition, output current of the inverter can be controlled to prevent switches from exceeding their current ratings. Thus, power capacity of the inverter can be effectively used and power quality can be improved. For controlling inverter output current, a current-clamp method (CCM) and an amplitude-modification algorithm (AMA) are proposed, which can determine inverter current command without needs of complicated calculation. Simulations and experimental results have verified the feasibility of the proposed PV inverter system and the two inverter-current control algorithms