Is the MATLAB Emulation of Grid-Connected Photovoltaic Accurate?

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Discussion Overview

The discussion revolves around the accuracy of a MATLAB emulation of a grid-connected photovoltaic system, specifically focusing on the behavior of current in the context of DC to AC conversion. Participants are examining the provided MATLAB code and diagrams, seeking feedback on the correctness of the graphs and the underlying electrical concepts.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant questions the relevance of the provided diagrams and the rectification of AC power, suggesting a misunderstanding of the intended application.
  • Another participant indicates confusion regarding the use of countercurrent and plans to clarify their approach in a revised document.
  • A participant mentions the use of the Runge-Kutta method to extract current values, noting discrepancies in the expected signs of the current values.
  • Concerns are raised about the circuit design, with a participant describing it as resembling a DC power supply and questioning the purpose of certain components and control concepts.

Areas of Agreement / Disagreement

Participants express differing views on the accuracy and clarity of the provided MATLAB emulation and diagrams. There is no consensus on the correctness of the current values or the circuit design, indicating ongoing debate and uncertainty.

Contextual Notes

Participants have noted limitations in the clarity of the provided documentation, including the need for translation and clearer explanations of the circuit components and their functions.

Negroponte
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I'm working on this subject. I'm trying to make a MATLAB emulation on this subject. In tha attached pdf I have the equations and the MATLAB code. You think that the graphs below are correct. You think that the current graph shouldn't be "negative".
I will be glad to see your comments.
 

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Sorry, your attachment makes no sense to me in the context of cogeneration and connecting a DC photovoltaic array to the AC Mains power grid. What is the AC source at the left of your diagrams, and why are you rectifying AC power? That would seem to be backwards from what the title of this thread implies you are wanting to do.

Also, the text in the PDF will have to be translated into English, if you want much feedback on the writeup.
 
Thanks for your reply...I will try to be more clear in a new pdf soon. I guess that you were confused because I actually use countercurrent...I will post a new version soon
 
Well, I upload a new version of my code. What I'm trying to make is an dc to ac inverter. I use method Runge Kutta extract current It and If. It is possitive, but If is negative(it should be possitive too). Also, for my possitive value of current It (about 48) I should take a possitive and rate value for the DC PV source Vpv. Anybody can help?
 

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Sorry, your circuit resembles a DC power supply.
And a rather odd DC power supply at best.
Are 1,2,3,4 supposed to be switchs in which case maybe, but in that case what is the purpose of Lf and Lw
If those are switches then what is your control concept.
 
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