Improved control implementation of single-phase current-fed PWM inverter for photovoltaic power generation

A new sinewave modulated control strategy defined as pulse area modulation, which has been proposed by the authors as the control strategy for high-power factor correction converters has been introduced to a utility-interactive current-fed sinewave inverter developed for PV power system applications. Simulation results indicate that the harmonics in the output current of the current-fed inverter using pulse area modulated processing were able to be almost completely eliminated on the basis of the proposed control strategy. This strategy is more effective for improving the steady-state characteristics of single-phase current source sinewave inverters, and is suitable for practical utility-interactive distributed power supply incorporating current source sinewave modulated inverter applications.