Model forward and reverse capacities for an electric branch

This example is valid for a DCUCOPF scenario. This example shows the procedure for an electric line, but the same concept applies to all electric branch objects.

1. Define the branch capacity constraints

The forward flow of a branch is defined as the flow going from the FromNode towards the ToNode. The flow in the forward direction is considered to be positive. The reverse flow goes from the ToNode to the FromNode and it has negative values. Access the property editor of the electric line and define the maximum active power constraints in the forward (PMAXDEF) and reverse (PMAXREVDEF) flow. The admitted values are positive for both PMAXDEF and PMAXREVDEF as shown in Figure 1.

define line caps 00
Figure 1. Electric line flow capacity constraints.

2. Activate the reverse flows

During a simulation, by default, SAInt will use the forward flow capacity as the active power constraint (PMAXDEF) in both directions. The network scenario event REVON must be activated to allow the simulation to differentiate between the forward and reverse flow capacity limits as shown in Figure 2. Go to the model explorer and right-click on Electric Network(ENET)  Scenario Event  Differentiate between forward and reverse flow through electric branches (REVON).

define line caps 01
Figure 2. Activate the electric network scenario event REVON.