Modeling And Simulation Of Hybrid Power System Based On Solid Oxide Fuel Cell And Micro-Gas Turbine

Solid Oxide Fuel cell (SOFC) is one of the most promising power generation technologies. Compared with the traditional way of power generation, SOFC can directly convert chemical energy into electricity energy by chemical reaction. Today, With the maturity of micro-gas turbine (MGT) technology, As exhaust gas temperature of SOFC matches with the input temperature of turbine in MGT, hybrid system consisted of SOFC and MGT can further improve overall efficiency and reduce pollution effectively etc. Therefore, hybrid system will have a good developing prospect in the future and has been one of primarily developed energy technologies.Lots of time and money will be spent, and more than that, many uncertain members will be existed during the experiment process. Thus, computational modeling and simulation will be more efficient and more economical. So, this method is very necessary and essential to research SOFC-MGT hybrid system.The main work in the paper is presented as following:Firstly, it established the one-dimensional mathematical model of SOFC and gave the volume-resistant modeling technology of SOFC. The SOFC model is established in MATLAB/SIMULINK platform and simulated. As can be seen from the simulation result, this model can better reflect the performance of SOFC and the effects for SOFC operation; if the fuel flow rate is changed, the whole power and efficiency will decrease, but it can also keep relatively high efficiency.Secondly, MGT system with recuperator mathematical model and simulation model library are built and simulated. The steady state results are close to parameters with reference, and the dynamic responses accorded with gas turbine general characteristic. Hence, the MGT model built is correct and available.Finally, created SOFC-MGT hybrid system model based on modular modeling and simulated. Hybrid system efficiency can achieve by 55% at design point. The delay time is about 1500s, which mainly influenced by the bigger thermal inertia component-heat exchanger and fuel cell.The paper studied the characteristics of a SOFC-MGT hybrid system. The simulation results showed, these models is suitable for simulation requirements and contributes to the development of SOFC-MGT hybrid system and detailed research.