The Research And Analysis Of PV Cells Power Generation Performance Impact Factors And The PV Grid-connected System Generation Capacity Simulation

Along with the photovoltaic system widely promoted, how to improve the performance of photovoltaic cells power generation, it attracts people’s more and more attention. However, there are many factors that can influence the performance of photovoltaic cells power generation, such as the temperature of the photovoltaic cells, photovoltaic panels surface dust density, crystal structure, the sun light intensity, the distribution of the solar spectrum, etc.The main content of this paper is the experimental test of the polycrystalline silicon PV module under natural conditions and constant resistive load, then there is a comparative experimental test for photovoltaic cells own temperature, density of PV module surface ash, PV module surface illumination intensity and other impact factors. Collation and analyze experimental data, in order to study these impact on the power generation performance of photovoltaic module. The paper uses the professional PV simulation software (PVSYST) to simulate the electrical characteristics of PV cells to study the impact of factors and to design lOkWp grid-connected PV power generation experimental system and predict its annual energy production. Finally, the simulation power generation capacity and the actual power generation are analyzed and studied.By the completion of the above work the following conclusions:(1) For the PV module connecting constancy resistive load, under certain solar radiation conditions, solar photovoltaic cells with their own temperature increasing, the photovoltaic cell output voltage, output current, power is significantly reduced, and PV cells’photoelectric conversion efficiency declines linearly. With the increasing density of PV module surface’s ash, the output efficiency of PV cells reduces, In the same amount of dust deposition, while the light intensity increases, the transmission rate increases not enough significantly.(2) The main factors affecting reverse characteristic of the photovoltaic cells are PV module surface irradiance, photovoltaic cells’temperature and PV module parallel bypass diode. With the number of bypass diodes increasing, the maximum power point power increase significantly, but the growth rate is gradually slow. This shows that not every single cell needs to parallel bypass diode, but to consider the costs and benefits issues to define the number of bypass diode. The use of PV module with parallel bypass diodes is to reduce the hot spot effect harm to PV cells. Cooling treatment of PV modules, cleaning and maintenance of PV module needs to be carried out regularly.(3) Through the comparative analysis of PV connected-grid test system’s actual power generation and software prediction power generation, it can be seen that the professional PV software (PVSYST) can be used to design PV power generation system reliably and effectively, and simulation prediction power generation can provide a strong basis for the PV system project’s feasibility and accounting its investment and return.