Add unit test with VSC voltage control and targetP = 0 #1002
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… in the hvdc line
Please check if the PR fulfills these requirements
Does this PR already have an issue describing the problem?
No
What kind of change does this PR introduce?
Explicit tests to check that a VSC in voltage control station holds tension even if no active power is flowing through the HVDC line.
What is the current behavior?
VSC stations behave as they should (tension is maintained even if P=0) but there is no explicit test to verify this.
VSC stations are holding tensions because the test check that Pmin < epsilon but for VSC stations Pmin is large but negative.
The tests prevent that a change in this condition breaks the VSC desired behviour.
What is the new behavior (if this is a feature change)?
No behaviour change. Just tests that ensure that the desired behaviour will not be broken by accident.
Does this PR introduce a breaking change or deprecate an API?