| At present,the fossil fuel based energy system has brought a lot of problems,such as climate change,air pollution,greenhouse gas emissions and over-reliance on fossil fuels.There is an urgent need to develop renewable alternative energy sources and to study their energy conversion and storage methods.As one of the most popular renewable energy conversion devices,wind power has become one of the most potential energy sources to replace the traditional power generation system because of its wide range of energy sources,environmentally friendly and so on.In order to solve the randomness and intermittent problems of wind power,the controllable fuel cell power generation system can be combined with the uncontrollable wind power generation system to ensure the stability of the system power supply.Compared with other types of fuel cells,Proton Exchange Membrane Fuel Cell(PEMFC)has the advantages of low operating temperature,short warm-up time,high power and no electrolyte leakage risk.Therefore,the combined power generation system of wind power and PEMFC is of theoretical and practical significance for solving the energy and environmental problems in the world today.Based on the National Natural Science Foundation of China "Distributed Multi Energy Supply System Mathematical Model and Optimal Control Strategy" and existing research results,the Wind-PEMFC power generating system is studied.The simulation models and working characteristics of the modules of wind turbine,PEMFC stack,electrolyzer,H2 storage tank,power conversion and control devices are established.The energy management strategy of the system is designed and its feasibility is verified.A simulation model of DFIG system is established,which includes wind turbine,transmission chain,DFIG,converter and wind speed.The principles of maximum power tracking and system control are also introduced in detail.The simulation and analysis are carried out according to the operation characteristics of wind farm under gradual wind speed.The principles and compositions of PEMFC are introduced in detail.Based on this,the MATLAB/Simulink software is used to model and simulate the influence of the output current and the intake air temperature on the system performance.Also,the power conversion model of PEMFC is established to meet the load demandIn this thesis,several existing hydrogen storage methods are introduced and compared.The electrolysis water is selected as hydrogen production method and the active carbon hydrogen storage tank is used as hydrogen storage method.Based on its working principle,the lumped parameter models of electrolyzer and hydrogen storage tank are established,and the results of its performance simulation are analyzed.Based on the working characteristics of each power generation modules,the energy management strategy of wind-PEMFC power generation system is designed.The control method and simulation model of the whole system are established on MATLAB/Simulink simulation platform.Combined with the change of wind speed and the user load,the system is simulated and verified its feasibility. |
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