The Simulation Of Concentration Solar Cells In Matlab/Simulink

Concentration solar cells can convert solar energy to electrical power directly via the Photovoltaic effect, for the simulation of concentration solar cells, there are two kinds of methods:the Manufacturing optimized and application prediction. Manufacturing optimized simulation mainly utilize professional device software such as PC-1D and SILVAC-TCAD by setting material properties, structure, doping concentration, mobility and other parameters to simulate the outputs characteristics of concentration solar cells, while application prediction simulation usually use circuit simulation software such as PVSIM、SPICE and PROTEL to build the equivalent circuit models for concentration solar cells and then substituted parameters that were acquired by experiment or calculated into corresponding components to simulate the outputs characteristics of concentration solar cells.This paper analysis the short-circuit current density, open-circuit voltage and efficiency parameters of the multi-junction concentration solar cells firstly in theory, then an application prediction simulator will be built in Matlab/Simulink. The simulator contains two parts, one is the physical that used to calculate the short-circuit current density Jsc for each sub-cells, anther one is the equivalent circuit model for multi-junction solar cells, these two parts are connected together with S-PS tools in SIMULINK. For the physic part, program a M file used to calculate short-circuit current density with discrete integral,and then this M file was called with S-function in Simulink. The inputs of this simulator are temperature and the beginning and ending of photons’wavelength that are absorbed from solar spectrum by each sub-cell of the multi-junction solar cells, outputs are voltage-current density, curves and voltage-power density curves, and data of these curves are saved in tables at the same time.Using this simulator, set Spectrolab C1MJ tri-junction concentration solar cell for example, simulate the influence of series resistance and shunt resistance on the outputs parameters, the results show that the smaller of series resistance and the larger of shunt resistance the better of outputs characteristics. At the same time, single C1MJ cell and different kinds of C1MJ cell arrays at different irradiation are simulated, results show that outputs of short-circuit current density and open-circuit voltage of single C1MJ cell are the same as the theory analysis. Then concentration ratios model are added in the simulator and still set C1MJ for example, simulate the outputs parameters such as short-circuit current density, open-circuit voltage and efficiency at different temperatures and concentration ratios, compared the simulation results with experiment data and calibrated results show that they are consistent very well with each other and also prove that the simulator is accurate and credible. The simulator that was modeled in this thesis can simulate the outputs of multi-junction solar cells at different utilization condition and very helpful for the prediction of multi-junction solar cells outputs performance at different utilization environment.