Research Of The Inspecting System Of Photovoltaic Cell Panels

The solar energy as a very important renewable energy is taking more and more attention of the people. Photovoltaic power generation is currently the main form of solar energy utilization. As the main component of photovoltaic power generation ,the long-term work state and the electrical properties of photovoltaic cell panels is necessary to carry out observation and research. Because the production processes of photovoltaic cell panels exist differences, their aging rate is usually different .In addition to the effect of the different sunshine intensity and the shadow obscurity, photovoltaic cell panels are very easy to have the hot spot phenomenon, which causes one or more of the photovoltaic cell panels end their using periods early.On this issue,This dissertation proposes and study a design programme of photovoltaic cell panels long-term operating parameters detection system.Taking into account and performance requirements, this subject using TI's chips TMS320LF2407 as a major chip and do the following aspects of work:First, we expound the principle of photovoltaic cells and the generation of I-U .On the basis of this, we explain the necessity for polling photovoltaic cells focusing on hot spot effect . In addition, we illuminate the photovoltaic cell panels long-term operating parameters detection system on the whole.Secondly, we study the hardware structure of the photovoltaic cell panels long-term operating parameters detection system based on the DSP2407, and give a specific circuit. First of all we discuss hardware system design, and then introduce the chip TMS320LF2407, focusing on the design and analysis of the light sampling circuit, the current sampling circuit, the voltage sampling circuit, photovoltaic power circuit and photovoltaic cells selecting circuit. Finally, we discuss several anti-jamming measures on DSP.Third, we write the main program and related subroutine of the photovoltaic cell panels long-term operating parameters detection system. In this chapter we elaborate the design process of DSP interrupt handling procedures and DSP suspended, and write part C program of the wavelet analysis.Finally, we introduce the wavelet transform theory, analyze the relationship between the wavelet signal-great value and local singularity ,and carry out noise and unwanted frequency components filter by using the different characteristics of voltage signals and noise in the wavelet coefficients .On the basis of this, we achieve the precise positioning when abnormal situations happen by detecting voltage signal corresponding singularity .And then we carry out the MATLAB simulation, which shows the effectiveness and the advanced nature of the system .The results showed that: This design programme of photovoltaic cell panels long-term operating parameters detection system have a certain practicality and scalability, providing a solid foundation for the follow-up study.