Improved Mathematical Model of Photovoltaic Cells and Application Simulation Research

For solving the problem of low precision of photovoltaic cell engineering mathematical model, the paper introduced the working principle of photovoltaic cell, on the basis of studying it's the equivalent circuit model and theoretical mathematical model, proposing a simplified model, deriving an approximate algorithm of the series resistance Rs and reverse saturated current I0 of the equivalent diode under general working conditions, and combining with engineering mathematical model, according to the factory technical parameters of photovoltaic cell, studying the functional relationship between the irradiance S and the broken voltage Uoc and the maximum power operating voltage Um on the ideal diode model, proposing the improved calculation method of simplifying model parameters under different working conditions, and establishing the improved engineering model. Using MATLAB, the improved engineering mathematical model and engineering mathematical model are used to simulate and compare the photovoltaic cells produced by actual manufacturers. The simulation results shown that the relative error of the improved engineering mathematical model is reduced, the fitting accuracy of the model is effectively improved, and it can more accurately describe the output features of photovoltaic cells.