Modeling And Simulation Of Output Characteristics Of Silicon Crystal Photovoltaic Cells

In twenty-first Century,the global economic growth led to a large amount of energy use and the environmental pollution caused by the free emission of CO2 and other pollutants.In order to achieve stable and sustainable economic development,the transformation of energy is imminent.Solar photovoltaic power generation can achieve zero pollution or even zero emissions,so it has excellent prospects for development and space.This paper first introduces the principle,structure and classification of silicon crystal photovoltaic cells.Through the analysis of the equivalent circuit diagram of the photovoltaic cells,the Simulink module is used to build the simulation model of the photovoltaic cells.It is known that the intensity and temperature of light will affect the output characteristics of the photovoltaic cells,and the light intensity is the main factor,and the change of light intensity has a great influence on the output characteristics.The light intensity has a positive correlation with the output characteristics of the silicon crystal photovoltaic cells,but the ambient temperature increases,the output current increases,the output power and voltage are reduced,and the decrease is very small.It is known from the above that the energy conversion rate of silicon crystal photovoltaic cells is low,and the highest conversion rate is only 35%so far.There are still many problems to be solved in photovoltaic power generation system.So it leads to the control technology of Maximum Power Point Tracking?MPPT?.The MPPT control method can improve the output efficiency of solar photovoltaic cell power generation system,the utilization ratio of solar energy resources and the rate of return on construction investment.In this paper,several commonly used maximum power tracking methods are compared and analyzed,in which the conductance increment method can also deal with the sudden change of the external environment smoothly,and the control effect is good.Compared with the power disturbance observation method,the output voltage fluctuation is smaller and the reliability is higher.Finally,the simulation model of a single crystal silicon photovoltaic cell board is built,and the maximum output power P_mpp and the corresponding point current I_mpp are compared with the data calculated by the mathematical formula to determine the correctness of the model.The simulation model of monocrystalline silicon photovoltaic cell and the maximum power point tracking control method under the Matlab/Simulink environment are combined,and the power generation power of the silicon crystal photovoltaic cells in Shenyang area is simulated and predicted.It is concluded that the maximum power of silicon crystal photovoltaic cells in Shenyang area is in May and June.The average output power of the monocrystalline silicon photovoltaic cells can be 580W-590W,and the average output power of the polysilicon photovoltaic cells is about 1.65×10³W.The output power is at least in November,December and January.The output power of monocrystalline silicon and polycrystalline silicon photovoltaic cells is220W and 560W respectively.