Are lumped elements series or parallel?

[AndrewKrill]

The documentation really isn't clear- at least what I've been able to find.

I assumed they would be serial, but after my sim came out different than I expected, and seeing an example with C=10p and R=10000, I'm not so sure. Really don't want to waste the time trying both cases. Hoping someone else happens to know.

Thanks

[VolkerMuehlhaus]

If you look at the C++ code in line 125 and below, you find this:

// The default is a parallel lumped circuit, in case none is supplied
https://github.com/thliebig/CSXCAD/blob/master/src/CSPropLumpedElement.cpp

[AndrewKrill]

So just to confirm... If I'm using matlab interface...

CSX = AddLumpedElement( CSX, 'HorizL', 0, 'Caps', 1, 'L', 47e-9, 'R', 0.003, 'LEtype', 1);

Should be a series RL?

[VolkerMuehlhaus]

@AndrewKrill Sorry Andrew, I don't know how to use those optional parameteres in the Matlab interface.

[thliebig]

The feature to switch the type LEtype is pretty new I think and I believe it is not even in the currently released version.
Thus I think this is still a simple lossy capacitor, meaning it is "parallel"...
I hope this helps.

[AndrewKrill]

What about inductors?

CSX = AddLumpedElement( CSX, 'HorizL', 0, 'Caps', 1, 'L', 47e-9);

Operator::Calc_LumpedElements(): Warning: Lumped Element R or C not specified! skipping.  ID: 50 @ Property: HorizL

[AndrewKrill]

I'm confused, looking at the code...

Are lumped inductors not implemented? Or do they require a resistance term?

[thliebig]

I think with the current release version only capacitors, resistors or lossy capacitors (C+R in parallel) are possible.

[gadiLhv]

You updated that PR, if I recall correctly, @thliebig. It should support inductors as well.

@AndrewKrill,
Inductor support in parallel

Inductor support in series

In series it's more implicit, you need to go to the PR to understand it better. The mathematical formulation is also there.

[gadiLhv]

This is actually related to CSXCAD rather than OpenEMS.

The relevant code snippet is here:

	enum LEtype
	{
		PARALLEL = 0,
		SERIES = 1,
		INVALID = -1
	};