Improved control strategy on single-phase current-fed interactive inverter

The single-phase PWM current-fed inverter has some feasible advantages for utility-interactive systems. In particular, it is more suitable for the non -isolated type of utility-interactive system topology that is widely used f or residential photovoltaic power generation systems in Japan. But, this so rt of inverter has a significant disadvantage. The output current of the in verter includes large harmonic components when its smoothing reactor is not large enough to eliminate its current ripple component. This paper present s a new control strategy to reduce sufficiently the harmonic component of t he single-phase current-fed PWM inverter, even when the ripple current in t he smoothing reactor is large. The principle of the proposed control strate gy for this inverter system is described and its simulation results are eva luated.