Research On The Modeling And Performance Simulation For Hybrid Generation System Based On PV/SOFC Technology

Governments around the world pay more and more attention for clean and renewable energy development and utilization to deal with the exhaustion of the fossil energy and the increasingly prominent environment problem. Compared with the traditional energy, solar energy as a renewable energy has the huge advantages of rich, clean and everywhere. So it is widely used in recent years. Considering the solar energy is instability and intermittent, the independent photovoltaic generation system need to combine the solid oxide fuel cell that is high efficiency, rich fuel and zero emissions to generate electricity. The PV/SOFC hybrid power generation system not only can relieve the energy crisis and reduce environmental pollution but also can solve the problem of power supply in remote areas.At present, the application of PV/SOFC hybrid power generation technology is not pretty mature in our country. The research of hybrid power system design and control is rare, too. In comparison, the theoretical research and practical application of hybrid power systems are much more advanced abroad. Through a further study of related literature at home and abroad, a PV/SOFC hybrid power generation system is proposed in this paper.The main components of the hybrid system include photovoltaic array, solid oxide fuel cell, solid oxide electrolyzer, compressor, hydrogen storage device and power conversion device. The system working principle is:when the sun is plentiful, the PV system provides power independently. At the same time, the redundant power is supplied for electrolyzer to generate hydrogen. Then the hydrogen is transmitted to hydrogen storage device through compressor. When the PV system power supply is shortage, the SOFC system is running for supplement power by using hydrogen stored.According to the principle and design requirements of the PV/SOFC hybrid power generation system, the main work includes:do a further study of the working principle of the main components include photovoltaic array, electrolyzer, compressor, hydrogen storage device, solid oxide fuel cell, and power conversion device and deduce the mathematical model of each module respectively. Modeling the main components model by the method of modular modeling on the Matlab/Simulink platform, and do the relevant simulation performance analysis. Do further study of the maximum power point tracking control strategy of photovoltaic, the perturb&observe, incremental conductance and BP neural network three algorithms are used to achieve maximum power control in accordance with illumination. Then the advantages and disadvantages are compared and analyzed. This paper proposes the energy management based on the whole PV/SOFC hybrid power system. Finally, the system is calculated and analyzed on the application and verify the feasibility of the system.