H_∞ Bust Control Of Molten Carbonate Fuel Cell For Distributed Generation

In recent years, centralized power in order to effectively deal with a variety of defects, increasing diversification of energy supply, reduce environmental pollution and achieve sustainable development, countries in the world are aware of renewable energy and distributed generation DG (distributed generation) technology importantly. Distributed power mainly in the fuel cells, solar photovoltaic cells and wind turbines, etc., as power systems. Molten carbonate fuel cell MCFC (molten carbonate fuel cell) has a clean, efficient, construction time is short, can the advantages of modular DG to become the preferred technology for power generation. In order to MCFC efficient, stable job, and to ensure that the system load frequently changing circumstances are not to be damaged, the need for effective control of fuel cells, so that the fuel cell to run in the best working condition.The normal operation of MCFC by two factors: excessive use and prolonged not fully utilized. In any case in which the operation efficiency and reliability of fuel cells will be reduced, in severe cases also cause permanent damage to body cells. Load changes or changes in fuel input would give rise to the above-mentioned two kinds of situations from happening. Therefore, the design of a change in external conditions can inhibit the adverse effects on the fuel cell controller is particularly important. To achieve load current in different circumstances, by controlling the importation of fuel flow to keep the output voltage constant, and make the fuel cell's fuel efficiency to meet the required constraints, this paper, H∞control strategy design of MCFC controller.In this paper, the dynamic model of the MCFC to do linear processing to H∞control theory based on the establishment of MCFC power generation system control model, linear matrix inequalities LMI (linear matrix inequality) method to solve the controller and the establishment of a complete MCFC stack control system simulation model to verify the correctness and effectiveness of control methods. Finally, the control system of MCFC as a stand-alone distributed power with a load for simulation analysis. Results show that the MCFC output power supply system to meet the load requirements, the role of the controller, when the load fluctuations, fuel cells can effectively contribute to the increase in fuel cells, and its fuel efficiency to maintain a reasonable range so that the whole power supply system robustness are greatly improved.