A novel control strategy on single-phase PWM current source inverter incorporating pulse area modulation

The single-phase PWM current source inverter has many advantages for utility-interactive PV systems. It is suitable especially for the noninsulated type utility-interactive topology which is widely used for residential photovoltaic generating systems. But this type of inverter has a significant disadvantage, that is to say, output current of the inverter has large harmonic components when its smoothing reactor is not large enough to eliminate the ripple component of its current. This paper presents a new control strategy to reduce the harmonic component of the single-phase PWM current source inverter sufficiently even when the ripple current in the smoothing reactor is large. Principles of the proposed control strategy and simulation results are described.