I have modelled simulation of PV grid based on Z source inverter, how can i remove these damped oscillations and keep a constant voltage?

Simulation of PV Grid based Z source inverter

Answer 1

[Sayan]

Hi Shashim Ramteke,

I understand from the issue that you are getting a sinosoidally damped output from your inverter. It is hard to debug without the Simulink model. However, some possible issues with your model and their resolution are as follows:.

• Ensure the PV array is properly rated for your desired output voltage and current rating. If you are using MPPT, ensure your model is able to follow your algorithm for the same.
• Verify if the rating of the Z-Source network inductance and capacitance values are properly selected for the required voltage and current rating.
• If you are using a PID controller for closed-loop control to generate the PWM pulses for the inverter switches, ensure the Kp, Ki, and Kd coefficients are properly tuned.

You can follow this example Simulink model which simulates a Z-source inverter. However, it uses a constant voltage source instead of a PV array.

https://www.mathworks.com/matlabcentral/fileexchange/79754-z-source-inverter

This research paper can be helpful for you to design a PV based Z-Source inverter.

https://www.researchgate.net/publication/320650017_Designing_Of_Z-source_inverter_for_photovoltaic_system_using_MATLABSIMULINK

Hope helps in resolving your issue.