Load flow - input and output data

You can find below the description of input data, which is necessary to be provided in order to calculate load (power) flow and output data which you receive after performing calculation.

Input elements:

  • Busbar
  • External Grid
  • Power line
  • Two-winding transformer

Output results for busbars:

  • Voltage [kV]
  • Voltage [pu]
  • Voltage Angle [deg]

Output results for branch elements:

  • Active power loss [MW]
  • Reactive power loss [MVar]
  • Current flowing into branch element [kA]
  • Current flowing out of branch element [kA]

Busbar

Name Unit Range Type Symbol
Name - - string
Bus no - >= 0 integer
Nominal voltage kV >= 0 integer \begin{equation} U_r \end{equation}

External Grid

Name Unit Range Type Symbol
Name - - string
Node number - >= 0 integer
Node type - SL, PV, PQ string -
Voltage angle deg - double -
Voltage setpoint p.u. >=0 double -
Active power MW - double \begin{equation} P \end{equation}
Reactive power MVar - double \begin{equation} Q \end{equation}

Power line

Name Unit Range Type Symbol
Name - - string
Start node number - >= 0 integer
End node number - >= 0 integer
Length km >= 0 double
Unitary Resistance Ohm/km >= 0 double
Unitary Reactance Ohm/km >= 0 double
Unitary Capacitance uS/km >= 0 double

Two-winding transformer

Name Unit Range Type Symbol
Name - - string
High voltage node number - >= 0 integer
Low voltage node number - >= 0 integer
Rated high voltage kV >= 0 double \begin{equation} U_{HV} \end{equation}
Rated low voltage kV >= 0 double \begin{equation} U_{LV} \end{equation}
Rated apparent power MVA >= 0 double \begin{equation} S \end{equation}
Rated load losses kW >= 0 double \begin{equation} P_{cu} \end{equation}
Short circuit voltage % >= 0 double \begin{equation} u_k \end{equation}