Evaluation of SEPIC-Boost Converter’s Stability Under Constant and Chaotic Input Conditions

Net Zero emissions are achievable if all stakeholders contribute to achieving the objective. As the energy industry is one of the major contributors to the production of greenhouse gases, moving from conventional fossil fuels to sustainable and clean energy is one of the measures. The ability to generate electricity by harvesting energy from methods including mechanical, vibrational, and solar irradiation has a lot of potential. However, the energy spectrum of the source is extremely unstable, which is a drawback to energy collection. The output voltage of the transducer may be chaotic or steady, and a DC/DC converter is required to filter and regulate it. To accomplish the regulation challenge, a variety of converter topologies and feedback control techniques have been devised. This study examines the stability of SEPIC-Boost converters with open loop and negative feedback built in their design, given constant and chaotic input from energy collecting sources. Given that it is one of the most efficient tuning techniques, PID feedback control based on modified Ziegler-Nichols tuning is chosen. The results showed that the proposed system performed poorly under both chaotic and constant input situations when run without feedback control. Massive overshoot of 19% and undervalue of 8.5% were observed. However, when both input conditions were given to the SEPIC-Boost converter, the system operated flawlessly under PID feedback control. With less than 1% of the ripple, the output reached the desired stability and it did not experienced any overshoots or undervalues when it was in use.