Hi Luke,
As per my understanding, the Simulink model generates unexpected oscillating voltage and current outputs when “PV array” block is given constant irradiance and temperature.
After reviewing the attached Simulink model, seems like the “PV array” block is used in discrete system. The “PV array” block has an algebraic loop in it. By default, the algebraic loop in the internal model of the “PV array” block is cut using a one-simulation-step time delay for discrete systems. This approach can cause numerical oscillations if the sample time of the simulation is too large.
In the “PV array” block, by default the "Break algebraic loop in internal model" parameter is selected. Deselecting this parameter, will in removing the oscillations observed in voltage and current. Here are the steps for the same:
- Right-click on “PV Array”
- Go to “Advanced” Tab
- Uncheck “Break the algebraic loop in internal model” parameter.
Please 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
Also, refer to the following MATLAB Answer for more information:
I hope this help.
Best Regard,
Aishwarya Palli
