High Step-Up Gain DC–DC Converter With Switched Capacitor and Regenerative Boost Configuration for Solar PV Applications

Abstract

Because of cost, size, and weight, the transformer is the primary burden in grid-connected solar PV-system and it decreases the whole system efficiency. In order to avoid the use of a transformer, a high step-up gain dc-dc converter is proposed by combining the switched capacitor and regenerative boost (SCRB) configuration in this brief. In classic boost type and derived converters, the device stresses and losses associated with the converter are high and result in lower efficiency. In the proposed converter, the SCRB operations take place simultaneously using lossless passive components and a minimum number of semiconductor devices. Thereby, it drastically increases the dc-voltage gain and enhances efficiency. In addition, it also dominates with fewer ripple content, which helps to elongate the lifetime of devices and suppress the electromagnetic interference. This brief describes detailed steady-state waveforms and various modes of operation under continuous conduction mode and discontinuous conduction mode. This brief also presents the performances of the proposed converter and compares with conventional converters characteristics. A 500 W experimental model has been built to validate the operation and confirms the theoretical waveforms with experimental results. The maximum efficiency of 95.60% is obtained at 480 W for the proposed converter.