AbstractThis work presents the digital proportional-integral (PI) and fuzzy logic controllers for the hybrid fuel cell (FC) system using the DC-DC converter of cascoded configuration. The hybrid FC system, which includes the FC, lead-acid battery, and ultra-capacitor, is utilized to improve the poor energy density and energy storage in the fuel cell. Moreover, a comparison between the PI and fuzzy logic controllers is made with consideration to design methodology, power tracking issues, and measured performance. Controllers implemented in a digital signal processor (DSP) are used to compare with startup power, tracking transient response of change in load, and stable output voltage.
Experimental results show that the output voltage of the hybrid FC system is kept stable at a constant value which is 200 V. By comparing the startup power and load transient response of the DC-DC converter obtained using a PI controller with that obtained using a fuzzy logic controller, the fuzzy logic controller is able to achieve fast transient response, reduce the overshoot and allow a more stable steady-state response than the PI controller.
|Date of Award
|Chih-Lung Lin (Supervisor)