getting negative open voltage in pv array

hello,

I model pv array block with input excel using signal editor and repeating sequences. I just put goto block in 'm' port of pv array to see voltage diagram. after i run my voltage which is open circuit voltage is in negative part of V-t

if anyone what is my problem please help me.

[madhan ravi]

Please show a screenshot or attach your model file.

[fatemeh]

i also add my file and the excel file which i use for my input

[fatemeh]

i also use this simulink which calculate until t=10

Answer 1

[Aishwarya]

Hi Fatemeh,

I understand that you are getting negative open circuit voltage from the “PV array” block, which is not the expected result.

In your Simulink model, the “PV array” block is used in a discrete system with large sample times. By default, the "Break algebraic loop in internal model" parameter is selected in the “PV array” block. For discrete system, the algebraic loop in “PV array” block is required to get an iterative, accurate solution for the highly non-linear diode characteristic. I would suggest deselecting this option which is present in “Advanced” tab.

For more information, please refer to below MATLAB Answers post:

• https://www.mathworks.com/matlabcentral/answers/2051407-pv-array-output-fluctuation-with-static-inputs
• https://www.mathworks.com/matlabcentral/answers/466337-why-do-i-get-algebraic-loop-error-when-using-pv-array-block

Kindly refer to the “Advanced” section of the below documentation for more details on “PV array” block: https://www.mathworks.com/help/sps/powersys/ref/pvarray.html

I hope this helps!

Best Regards,

Aishwarya