This example shows how to model a solar panel using information from a manufacturer datasheet. The data is imported and used to generate current-voltage and power-voltage curves for the solar panel. The power-voltage curve is useful for designing an inverter because it helps to identify the peak power for a given irradiance level and panel cell temperature
The Solar Panel subsystem models a solar panel that contains parallel-connected strings of series-connected solar cells. The solar cell strings are modeled by a single Solar Cell block from the Simscape™ Electrical™ library. The number of parallel strings is defined by the workspace variable Np_cell and the number series-connected cells in each string is defined by workspace variable Ns_cell.
Connecting multiple solar cell strings in parallel can slow simulation because it increases the number of elements in a model. To avoid a reduction in performance, a controlled-current source scales up the current to the fulfill the demand of the requisite number of parallel paths. The current source is modeled by a Current-Controlled Current Source block from the Simscape™ Foundation Library.
The implicit assumptions are that:
All of the solar cells are identical.
Temperature and irradiance levels are the same for each cell.
The plot shows current and power as a function of voltage for various irradiance and cell temperatures. The table shows the peak power values extracted from the plot. If the datasheet includes a plot like this, then it can be used to validate correct parameterization of the Solar Cell block.
Maximum power operating points PanelIrradiance CellTemperature MaximumCurrent MaximumVoltage MaximumPower _______________ _______________ ______________ ______________ ____________ 200 25 1.5067 27.11 40.847 500 25 3.7887 29.066 110.12 1000 25 7.6059 30.557 232.41 200 50 1.4954 23.88 35.712 500 50 3.7665 25.992 97.899 1000 50 7.5762 27.576 208.92