Study On The Solar Array Simulator Based On DSP

With the world’s energy problem becoming more and more serious, people have been committed to the development and utilization of new energy for a long time. Solar energy has a wide range of development and utilization in new energy, such as nuclear energy, geothermal energy, wind energy and so on. The Proportion of photovoltaic power generation to the whole is becoming larger and larger while the research on photovoltaic power generation system is getting deeper and deeper. However, light intensity, environmental temperature and environmental conditions have an enormous influence upon the photovoltaic cells. Thus, using real photovoltaic cells in the tests of photovoltaic power generation system will make some certain restrictions to the photovoltaic power generation system. Solar array simulator can show the output characteristics of photovoltaic cells at any illumination and temperature in the lab, which could reduce the development costs and shorten the development cycle as well as improve the efficiency of research and development. The researcher has done the following work based on this topic:After researching the equivalent circuit and mathematical model of photovoltaic battery, the writer gets the math expression of the photovoltaic battery output characteristic. The PVsyst software is used to get an imitation research about the affecting factors on the photovoltaic cells output characteristics and its conversion efficiency, which include illumination, battery temperature, light resistance and all kinds of losses. Then, methods to improve the conversion efficiency of photovoltaic battery are put forward.The writer Introduces several commonly used isolation type DC/DC converters and the working principle and working mode of each converter, and comparatively analyzes the advantages and disadvantages of different kinds of converters and its using occasion. According to the requirements of the design and performance of the photovoltaic battery array simulator, A half bridge converter is chosen as the topological structure of the main power circuit of the simulator, with the parameters of the components and the function circuit designing.To change the situation that only voltage control and current control are used to cause the fluctuations of output voltage and current in the design of photovoltaic battery array simulator, a compound control strategy is proposed. Photovoltaic battery array I-V characteristic curve will be divided into two areas by the maximum power point, which means that the current control method works where the current is approximately constant while the voltage control method works where the voltage is approximately constant. In addition, the writer designs the hardware and software of the controller by using TMS320F2812DSP as the controller of the simulator.By the use of Matlab/Simulink software, an1kw simulation model of photovoltaic battery simulator is set up. Some static and dynamic simulation experiments are carried out to draw the simulation curve on which the analysis about the correctness and rationality of the designed simulator is based...