simulation error with PV array

2024 9 23
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更新时间：2025 1 27
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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

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Vinay
Vinay 2024-9-24

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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!

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Ahmad
Ahmad 2024-9-26
from where do i decrease the value of shunt resistor from below picture it is not changable.
Vinay
Vinay 2024-9-26
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
Humaid 2025-1-27
how we can change Rsh?

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Ayush
Ayush 2024-9-24

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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);

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