Hysteresis Current-Mode Regulated Modified SEPIC-Buck Converter Used for Solar Photovoltaic Systems

This paper is focused on the modeling and simulation of a hysteresis current-mode regulated high-gain DC–DC converter intended for solar applications. First, the study effort outlined the working principle of a novel high-gain DC–DC converter scheme called a double-switch SEPIC-buck converter (DSSB). This work also presents the dual hysteresis current control technique, which aims to enhance the system's performance and lower the harmonic content of its voltages and currents. Two dual hysteresis current controllers independently control the source and load currents of the proposed converter. The frequency and hysteresis bandwidth are also simultaneously set using the two controllers. Compared to other standard DC–DC converters (buck, SEPIC, boost, and buck-boost), DSSB has better efficiency, a larger voltage gain, and superior dynamic characteristics. The suggested topology has a peak efficiency of 95% and a voltage gain of \(\left( {1 + D} \right)D/1 - D\) $\left(1+D\right)D/1-D$ . The suggested DSSB converter has a THD of 6.6% and an efficiency of 97–98% when compared to various DC–DC converters, while the conventional SEPIC converter, along with boost, buck, and buck-boost converters, have a THD of 10% and an efficiency of 95–97%. Additionally, the DSSB converter has a far smaller crest factor than all other DC–DC converters, including boost, buck, buck-boost, and SEPIC. The suggested converter's performance is theoretically assessed using simulations based on Matlab/Simulink software under various circumstances. The results of simulation work in Matlab/Simulink corroborate the findings of the analysis and investigation.