Design And Layout Analysis Of Grid Connected Photovoltaic System

As the photovoltaic power generation system has the outstanding advantages of rich resources,wide application and clean energy,it will play a very important role in the future energy field.Photovoltaic power generation equipment used in building is one of the most important components of distributed generation.Compared with the traditional generation mode,the distribution of photovoltaic power generation system and its characteristics which are easily affected by various factors such as temperature and illumination make the control strategy of the PV system more complex.Based on the photovoltaic project of a warehouse in Beijing,this paper studies the control methods of photovoltaic system and explores its application in urban buildings by establishing a simulation model and relying on the simulation environment of Matlab / Simulink.First of all,this paper introduces the principle of photovoltaic power generation,gives the circuit model of the photovoltaic module and establishes a mathematical model for the output characteristics of the PV module.The structure of photovoltaic system is briefly introduced,and the part of the maximum power point tracking and the grid connected inverter in the system control strategy are analyzed.The application mode of PV system in urban buildings is discussed,and the difference between BAPV and BIPV is compared.Secondly,in order to ensure that the system can output maximum power and improve the efficiency of the system,several common algorithms of maximum power tracking strategy are introduced,and the MPPT algorithm of the simulation system is taken by the conductance increment method.In order to simplify the complexity of control,the control principle of the two level circuit using Boost circuit to realize MPPT function is introduced.In addition,the PQ decoupling control strategy,the three-phase grid inverter strategy of the PI controller model and the principle of the same frequency phase of the output voltage and the power grid by the design of the SPLL phase locked loop are also introduced.The feasibility of the above control strategy is verified by simulation experiments.Finally,considering the variation of the tilt angle of the photovoltaic module,the relationship between the angle and the radiation is analyzed,and the mathematical relationship between the two is established.The relationship between the angle of BAPV and BIPV two modes of PV module and the amount of radiation is analyzed.The shape and angle of the building roof are analyzed with Ecotect software,and the best shape and angle of the roof are determined,and the appropriate suggestions are given from the practical feasibility and economy.