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How does Modelica check the structural singularity?

In Example 1 from chapter 4.7 of Modelica specification 3.4, I am not sure why there is no structural singularity. I add two equations generated according to the flow variables, and it seems this equation system doesn't have a unique solution.

So why isn't there structural singularity in this example?

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I add the two equations(p.i=0 n.i=0) according to the paper Balanced Models in Modelica 3.0 for Increased Model Quality, here is the screenshot of this paper.

How should I understand the concept of "generic coupling" for top-level connectors? Does it mean setting the flow variables as zero or constant?

enter image description here

Solution

  • As far as I recall the generic coupling means that:

     p.i=f1(p.v, n.v);
 n.i=f2(p.v, n.v);

    for some unspecified (or generic) functions f1 and f2; not the trivial function p.i=0. (Possibly it is some variant of this.)

    Note that quoted text is for the reverse case; where you have a replaceable Load C.