Hello, what a great series.. thank you professor for sharing this with us. I have a question, how can I avoid the initial transient that can be observed at the start of each graph at 7:00 ? If I'm not mistaken that transient arises only because of the big difference between the reference Vdc and the real Vdc, am I correct? Is this a limitation of the IMC tuning method? Are real PV systems affected by this kind of problem or is there a solution to this? Thank you again Francesco
You are right ! You can also tune the controller more aggressively by choosing a smaller desired closed-loop time constant (= tuning parameter for IMC tuning). In some applications where the DC bus is coupled to another DC/DC inverter, it might be useful to use the DC current as a feedforward for the DC bus control. Thank you for the feedback.
Thank you for a great video once again! Do you use saturation in both the "PI Voltage DC" and the "PI current dq" blocks? If so, how would you recommend setting the saturation limits?
Yes. This all depends on the actual system/process you are working on. For the voltage control loop, the output of the controller (IDC) should be limited to +-15000/700, assuming a 15kW inverter and a 700V DC bus. For the current control loop, the output of the controller (Vinv) should be limited to +- alpha*UDC/2 where alpha (alpha >= 1) depends on the modulation strategy. Modulation strategies have not been covered in this video course. I hope this helps.
Hello, what a great series.. thank you professor for sharing this with us.
I have a question, how can I avoid the initial transient that can be observed at the start of each graph at 7:00 ? If I'm not mistaken that transient arises only because of the big difference between the reference Vdc and the real Vdc, am I correct? Is this a limitation of the IMC tuning method? Are real PV systems affected by this kind of problem or is there a solution to this?
Thank you again
Francesco
You are right ! You can also tune the controller more aggressively by choosing a smaller desired closed-loop time constant (= tuning parameter for IMC tuning). In some applications where the DC bus is coupled to another DC/DC inverter, it might be useful to use the DC current as a feedforward for the DC bus control. Thank you for the feedback.
hello can you tell me what is Kc and Ti value in voltage controller plz. thank you
Hello, This is explained in the previous videos (video 5). Regards.
Thank you for a great video once again! Do you use saturation in both the "PI Voltage DC" and the "PI current dq" blocks? If so, how would you recommend setting the saturation limits?
Yes. This all depends on the actual system/process you are working on.
For the voltage control loop, the output of the controller (IDC) should be limited to +-15000/700, assuming a 15kW inverter and a 700V DC bus.
For the current control loop, the output of the controller (Vinv) should be limited to +- alpha*UDC/2 where alpha (alpha >= 1) depends on the modulation strategy. Modulation strategies have not been covered in this video course.
I hope this helps.
@@frankydebruyne9842 It helped a lot! Thank you!
Thank you for great series videos. Sir please share the matlab files for easy understanding of your video's if possible.
Sorry but the slides and other files are reserved for ECAM students only. I hope you understand.