基于Boost電路的MPPT光伏發(fā)電系統(tǒng)研究
[Abstract]:With the depletion of fossil energy and the limited development of nuclear energy, the energy problem has become an inevitable challenge for all mankind. Photovoltaic power generation technology is the main form of solar energy utilization. The proposed and applied maximum power point tracking (Maximum power point tracking,) based on improving the efficiency of solar energy conversion provides a solid foundation for the optimal utilization of photovoltaic power generation systems. In this paper, the detailed work plan for MPPT technology is carried out, and the design and simulation of photovoltaic power generation system with MPPT controller as the core are completed, which solves the problem of low energy conversion. Firstly, the photovoltaic power generation system is introduced. Secondly, the basic principle of photovoltaic power generation system is expounded. Then, for the DC/DC conversion circuit of the MPPT controller, the working mode of the circuit CCM is expounded, and the Buck and Boost circuits are modeled and simulated by two methods. The Boost circuit is easy to design and can boost the voltage. And can be guaranteed to work in CCM, with more practical characteristics. Furthermore, the realization principle and control flow of the traditional MPPT algorithm are explained. The simulation results show that the improved variable step size perturbation observation method has better tracking control performance when the light intensity changes, but the tracking effect is poor when the temperature changes. In view of the fact that the traditional modified disturbance observation method can not respond well to the change of the environment and there are serious oscillations and large deviations, a new artificial intelligence control method, the fuzzy control method, is put forward to carry out systematic analysis. The design of the system is completed by determining the fuzzy control rules and setting the parameters of the FIS editor. Finally, the simulation model of MPPT artificial intelligence control system for photovoltaic power generation is built, and the related parameters are set up. The effectiveness and feasibility of the fuzzy control method are verified by comparing and analyzing the simulation results.
【學位授予單位】:浙江工業(yè)大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:TM615
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