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Cascaded Boost-Inverter Topology for Solid Oxide Fuel-Cell

Swagatika Acharya, Dr. Kanhu Charan Bhuyan

Abstract


The surge in energy requirements within the industrial sector has propelled studies towards renewable energy sources and the enhancement of energy efficiency. The voltage generation system utilizing SOFC integrates multiple components, including the SOFC stack, DC-DC Boost converter, DC-AC inverter, and various controllers tailored for Boost-Inverter and cascaded boost-inverter configurations. This paper outlines a DC-DC boost converter, showcasing diverse control methodologies that elevate the SOFC's initially low DC output voltage to a required level. It explores different feedback control strategies, including the use of Proportional-Integral (PI) controllers, Proportional-Integral-Derivative (PID) controllers, and Fuzzy Logic Controllers (FLC), proposing enhancements for effective energy conversion. Apart from this a Boost-Inverter topology has been discussed to convert, the boosted DC voltage output of the Boost converter into AC voltage output. Further two Boost-Inverter circuit have been cascaded to get a higher voltage output with reduced harmonics. A pulse width modulation (PWM) generator has been attached to each inverter to supply gate pulse .Only a single controller is used to control both the cascaded converters, which makes this system cost effective and more efficient. The proposed cascaded boost-inverter topology improves the SOFC generated 15V DC voltage to a 60V AC voltage with 34.61% total harmonic distortion (THD).


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References


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