a soft switched dc-dc boost converter for use in grid connected inverters

This paper presents a soft-switching dc-dc boost converter, which can be utilized in renewable energy systems such as photovoltaic array, and wind turbine connections to infinite bus of a big power network, using grid connected inverters. in the proposed topology for the dc-dc boost converter, the main and the auxiliary power switches are turned on and turned off with zero voltage switching (zvs) and zero current switching (zcs), respectively. furthermore, by applying soft-switching techniques to driving power switches, the power losses and stresses associated with commutation of power devices decrease significantly. the efficiency of the proposed soft-switched dc-dc converter at various output powers is compared with that of the traditional dc-dc converter and a few topologies proposed in recent literature. this comparison indicates that the proposed dc-dc boost converter is much more efficient around the rated power (1 kw). the power topology and the control strategy applied to the proposed soft-switched dc-dc boost converter, which is connected to a grid-tied inverter, are analyzed theoretically by simulation studies. moreover, an experimental prototype is implemented to verify the theoretical analysis and the simulation studies.