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Those characteristic curves look like they model the behavior of a solar cell to me.
Require a Solar Array model in Pspice, [not LTSpice]
- Thread starter MikeJacobs
- Start date
In the very beginning i mentioned i needed a functional model.
This is a model, not a functional model.
I explained i needed a model that can be used in other parts of a schematic. This is not the case as is.
The model is not useable in other circuits and is strictly academic. That is not a functional model in my mind but simply models the behavior of the cell.
You cant use it to do anything except look at a graph.
Also, perhpaps its just my lack of understanding but the "model" has a voltage source in it. so why are we putting another one in the mix.
This makes fundamentally no sense to me
If you need an addtional source then this is not a model. If i go out and buy a PV cell and hook it up to a resistor and NOTHING else i will see the characteristics i am after. I dont need to hook it up to a resistor and another voltage source.
That is what i need Pspsice to do.
So it appears it absolutely can not be done this way.
This is a model, not a functional model.
I explained i needed a model that can be used in other parts of a schematic. This is not the case as is.
The model is not useable in other circuits and is strictly academic. That is not a functional model in my mind but simply models the behavior of the cell.
You cant use it to do anything except look at a graph.
Also, perhpaps its just my lack of understanding but the "model" has a voltage source in it. so why are we putting another one in the mix.
This makes fundamentally no sense to me
If you need an addtional source then this is not a model. If i go out and buy a PV cell and hook it up to a resistor and NOTHING else i will see the characteristics i am after. I dont need to hook it up to a resistor and another voltage source.
That is what i need Pspsice to do.
So it appears it absolutely can not be done this way.
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How am i wrong? Instead of just saying im wrong feel free to offer advice.
Its a fact, the model is not a functional model. And can not be used without an voltage source.
Its also a physical fact that if i went to hardbor freight and bought a $10 PV panel and put a suitable wattage resistor across that was of a low ohmic value i would see approximately zero volts and whatever the ISC rated current is on the panel.
Those are FACTS not me being wrong on all acounts. Those are the facts of how a PV panel works
In addition to that, the model does not factually work the same way.
So. e.g the model is an academic model and not a functional model which was the whole point of this thread.
I am all ear, please tell me how i am " all wrong"
That is what i am here for. An education on this topic. So if i am making an incorrect assumption feel free to explain.
What is fundamentally wrong is to connect a 36V panel to a 12V voltage source with a load in the middle and expect to see the real characteristics of the PV panel alone.
And to expect to see any functional representation of the PV panel.
In addition to its output voltage, the E1 device outputs a load current. In the diagram, E1 is used as the current source by specifying E1 in the source attribute of the F device.
The author of the video doesn't say what the 12v supply represents (which is not unusual, but not desirable). It could represent a12v Battery being charged by the solar panel. Also, I don't think n=36 represents the output voltage, but represents the number of CELLS connected in series. So...question is...what is the voltage output of a cell? Then do the math to figure out what n=?.
The circuit works as the author claims.
If you like, you can remove the 12v Voltage source, then short the output to ground. You will see the full output current with pv=0.
I think post #15 has got it right for pspice. Experiment by removing the 12 voltage source and open/short/ load the output. If it still doesn't do what you want then this is the wrong simulation model for you needs.
I have tried and it will not
Which was the very point of this post stated in post #1
A functional model with the requirements of exactly that stated in post #1
So now that we are completely back to square one.
Does anyone know how to make a functional model like this in Pspice?
@eetech00 Thanks for your efforts!
It worked for me. I shorted the output and and the results were 5A@0v
I don't understand.
I think it does that.
I make a lot of spice models, including converting pspice models to LTspice.
See post #15
In the 5 parameter model it uses electrical equivalent models. The number of cells is another variable.
I looked at a few Photo Voltaic cell data sheets.
The power over voltage curve do have similarities. Form does equal function if sunlight dealt with as a fixed ideal source.
Developing a spreadsheet to turn out models to fit data sheets would make it possible to
enter each parameter into a pspice sub-circuit. The spreadsheet would generate PV model parameters.
I looked at a few Photo Voltaic cell data sheets.
The power over voltage curve do have similarities. Form does equal function if sunlight dealt with as a fixed ideal source.
Developing a spreadsheet to turn out models to fit data sheets would make it possible to
enter each parameter into a pspice sub-circuit. The spreadsheet would generate PV model parameters.
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Thanks for your efforts on this
I am revisting this
I tried to build up the model
What are you doing to simulate the shunt?
In other words there is no switch here so what is the mechanism you are using in the simulation to simulate the shorting of the panel?
