PV educator

In PSPICE plotting is not based on programming like that in MATLAB. In fact, the plotting is based on the set of variables that can be selected for x and y axis. The problem, however, is that if you want to plot two curves with different ranges of x axis variables.  I spent quite a time on solving this issue. Although I did not reach where I wanted to land, however, i found one solution but first, let me introduce you to the circuit i wanted to simulate.
The figure above shows two PV cells connected in series with each other. The combined output is taken from the node 3 and 5. I want to draw the I-V curves of both the cells as well as their combined output. However, in order to do so if I select the x axis as the voltage V3 the I-V curve for the individual cells is compromised and if I select the x axis as V3-V1 then the I-V curve of combined cells is compromised. To solve this I selected two plots and unsynchronized their x axis as shown in the figure below. To unsyncronize the x axis click on plot > unsynchronize x axis.


The next challenge is to plot them on one plot. 

Shunt and series resistance are important to model a realistic PV module. These resistances demonstrate the non-idealities in a PV module. The series resistance Rs defines the resistance of the material that collects the charge from the PV module. This resistance is small and ideal value is zero. The shunt resistance Rsh defines the defects in the semiconductor and the electron-hole recombination before it reaches the output. The value of this resistance is very high and ideally, it is infinity.
On a current-voltage curve, the shunt resistance lies on a slope near Isc and series resistance on the slope near Voc. To elaborate this further, consider that the series resistance is zero and therefore, the voltage V=Vsh.

Note : If you are using a variable step size in simulink, then add a zero order hold before each input of sim coupler and insert the sample time same as of PSIM. If you are using fixed step size in simulink then 

The dSPACE is used widely now a days to validate the theoretical algorithms. The data file is usually in Microsoft access format that can be plotted using MATLAB. The data extraction is particularly helpful in genrating IV and PV curves based on the experimental data.

Offline MPPT method works by disconnecting the PV panel from the system in order to measure either the short circuit current or open circuit voltage (also referred as offline parameters). During the measurement instant, the PV panel is isolated from the rest of the system, hence it is called as offline MPPT. It has two types