Date of Award
Doctor of Philosophy (PhD)
Electrical and Computer Engineering
Yuri B. Shtessel
B. Earl Wells
Sliding mode control., Fuel cells., Power resources., Renewable energy sources.
The main contribution of this dissertation is in robust decentralized control of the fuel cell (FC)-based electric power systems conditioned by boost DC/DC power converters in single modular and multiple modular configurations, specifically with shared and individual loads, including controlling servomechanisms powered by the considered FC-based electric power systems. Relative degree approach is applied for direct control of the output load voltage for the boost DC-DC converters in single modular and multiple modular configurations. The adaptive gain second order (2-SM) super-twisting sliding mode controller is proposed for controlling the current in PEMFC. The conventional Sliding Mode Controllers (SMC) is designed for controlling the output voltage of the DC-DC boost converters in single modular and multiple modular configurations in the presence of the model uncertainties and external disturbances, including unpredicted change of the load. The zero dynamics of the studied FC-based electric power systems is analyzed and appeared to be stable. The non-minimum phase property of the DC-DC boost converter is eliminated by controlling the FC current based on the power balance in all the four FC- based electric powers systems. The efficacy and robustness of the proposed FC-based electric power systems are confirmed via computer simulations.
Ashok Kumar, Roshini Sukanya, "Control of fuel cell based electric power systems using adaptive sliding mode control and observation techniques" (2015). Dissertations. 73.