System Matrix Stamp of DP_Ph3_VoltageSource

[cwirtz-fgh]

System Matrix Stamp of DP_Ph3_VoltageSource

In DP_Ph3_VoltageSource Line 69 the stamp for phase C differs from A and B:

`if (terminalNotGrounded(0)) {
...

	Math::addToMatrixElement(systemMatrix, matrixNodeIndex(0, 1), mVirtualNodes[0]->matrixNodeIndex(PhaseType::B), Complex(-1, 0));
	Math::addToMatrixElement(systemMatrix, mVirtualNodes[0]->matrixNodeIndex(PhaseType::B), matrixNodeIndex(0, 1), Complex(-1, 0));

	Math::addToMatrixElement(systemMatrix, matrixNodeIndex(0, 2), mVirtualNodes[0]->matrixNodeIndex(PhaseType::C), Complex(-1, 0));
	Math::addToMatrixElement(systemMatrix, mVirtualNodes[0]->matrixNodeIndex(PhaseType::C), matrixNodeIndex(0, 2), -Complex(-1, 0));
}`

This leads to phase C beeing shifted when transformed into EMT frame and unintended model behaviour:
Bug ( with -Complex(-1,0)); )

Fixed (with Complex(-1,0)); )

[m-mirz]

Fixed in #137
To be reviewed by @dinkelbachjan

[m-mirz]

Closed by #137