Research On A Digital Photovoltaic Simulator Based On DSP

Solar energy is paid more and more attention to as a new type of regenerated energy sources. As the most important technology in the use of Solar energy, PV power system is used all over the world. It's necessary to imitate the performance characteristic of solar cells if researching Solar energy in the laboratory condition.This paper analyzed the I-V characteristic of solar cells and its mathematical model. Furthermore, this paper presents the engineering analytical models of solar cells derived from the mathematical model. And this paper presents my own solution of the PV simulator on the study of all the papers about the simulator.Hardware that contains DSP controller, IGBT driver and main circuit were introduced in detail; . Quadratic polynomials are used to fit the real PV array's I-V characteristic curve, and it is programmed by assembly language to fulfill the algorithm.Through the simulation under Matlab and the experiments, the exactitude of the system is illustrated. The experimental results show that the output characteristics of the simulator are very close to those of actual solar cells, and the simulator has a good dynamic response as well. It can search the working Point automatically and stabilize the output according to the change of the loads.Therefore,to some extent,the simulator can be used in replacement of actual solar cells in the laboratory condition, provide a good environment for experiment to cut down money and time.