DSM control strategy of solid oxide fuel cell distributed generation system
COMPUTER MODELLING & NEW TECHNOLOGIES 2014 18(2) 63-69
School of Electrical Engineering, Tongling University, Tongling City, Anhui Province, China, 244061
The distributed power generation system of fuel cell has received the widespread attention in recent years for its pro-environment and high efficiency. The solid oxide fuel cell (SOFC) is a new power system, which turns chemical energy of fuels into electrical energy directly at middle and high temperature. Mathematical model of SOFC is analysed and the main circuit structure of independent power generation system is designed in this paper. The traditional PI control is adopted in DC/DC boost circuit to ensure the fuel cell can provide a stable DC output voltage. The three-phase inverter is used in DC/AC circuit and the dynamic equation derived from three-phase inverter is transformed to the synchronous rotating coordinate system. An innovative discrete sliding mode (DSM) control technology is applied and the system output stable sinusoidal AC voltage. The simulation experiments prove that SOFC power systems, in a certain range, can quickly and dynamically trace the change of the input voltage and load using DSM control.