simulation error with PV array

An error occurred during simulation and the simulation was terminated

Caused by:

Block 'solar/PV Array/Diode Rsh/Math Function' outputs 'Inf' for element 1 of output port 1 at major time step 0

Component:Simulink | Category:Block error

Answer 1

[Vinay]

Hi @Ahmad,

The issue arises because the PV array's output voltage is extremely high, resulting in a (Vd/Vt) ratio of around 3. 8e4.The issue can be resolved by decreasing the value of the shunt resistance (Rsh) connected with the diode to reduce the Voltage drop across the PV array as Vd depends on PV array voltage as (Vd=V_PV + Rs*I_PV)

The Number of series cells (Nser) can be increased to increase the threshold voltage of the diode to achieve the desired Vd/Vt levels or to use a DC-DC converter to regulate the output voltage of the PV array

Kindly refer to the below documentation of “pv array” for more details:

https://www.mathworks.com/help/releases/R2024a/sps/powersys/ref/pvarray.html

I hope this helps!

[Ahmad]

from where do i decrease the value of shunt resistor from below picture it is not changable.

[Vinay]

Hi @Ahmad,

You can use the Ctrl+U to view under the mask in the PV array and can change the value of shunt resistance named "Rsh_5%".

[Humaid]

how we can change Rsh?

Answer 2

[Ayush]

Hi @Ahmad

The error you are encountering is because the model is evaluating the exponential of vd/vt = 3.8e4 as shown in the signal values:

As a workaround you can limit the exponential Input as:

% Pseudo-code for limiting vd/vt
vd_vt_limited = min(vd/vt, max_limit);