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Difference between the Approximate Formulas and Difference Power Flow when evaluating slow voltage rise
Approximate Formulas
The approximate formulas will calculate an approximation on the voltage change at the connection point using the grid's short circuit power at the connection point, the device power and impedance ratio at the connection point.
INFO
The formulas can be found at VSE.
Difference Power Flow
The difference power flow will perform two power flow calculations on the whole grid, once with the requested device and once without. The resulting voltages are then compared and the relative difference between them is calculated. The result will include an evaluation on the whole grid.
INFO
This method is more accurate but only works for three-phase connected devices.
What options should be chosen when evaluating according to Difference Power flow?