Design, analysis and limitations of a DC-to-AC converter usable for interface alternative energy sources and energy storage systems with the utility grid

A DC-AC power converter design that can be used to interface any type of alternative energy source or energy storage system with the utility grid is presented. The converter is capable of real and reactive power exchanges between the utility grid and the alternative energy source(s). The control philosophy is very simple and allows for the synthesis of useful harmonics. Experimental results are provided to demonstrate the versatility of the converter circuit as a reactive power exchanger at the fundamental frequency; an active power line conditioner; and an active filter. Various design constraints are discussed and the limitations of the converter circuit are analyzed