Multiplication based synthesis of grid tied inverters

High energy conversion efficiency of grid tied inverters for renewable energy applications constitutes a prime design goal of these systems. On the other, presently employed PWM techniques seem to set a bound to the efficiency since the associated switching losses are difficult to reduce. This paper introduces a new approach to synthesis of sinusoidal waveform in which the switching frequency is relatively low (in contrast to PWM technique) which yield a major reduction in switching losses. Even though the switching frequency is low, the harmonic content at the inverter´s output is extremely low which allow for significant size decrease of the output filter. The method is based on a multiplication like principle, which is described in this paper.