Contingency Element Type: DC Line

Concept Link IconSee Also

 

The following describes the options available when creating a contingency element of type DC Line. Contingency elements are created from the Contingency Element Dialog, and additional details of how to create contingency elements can be found here.

 

Action Settings

Open

The Open action will set the Control Mode of the selected dc line to Blocked. If the dc line is already blocked, this action does nothing.

Open Breakers

See the special topic on Open Breakers for more detail.

Close

The Close action will set the Control Mode of the selected dc line to either Power or Current. When selecting the Close action, the Amount must be specified for the new Setpoint of the dc line in either MW or Amps. If specifying the Setpoint in MW, the Control Mode of the dc line will be set to Power. If specifying the Setpoint in Amps, the Control Mode of the dc line will be set to Current.

Close Breakers

See the Close Breakers for Contingencies topic on the Contingency Element Dialog topic.

Set To

The Set To action will set the selected dc line’s Setpoint or resistance to a specified Amount and could possibly change the Control Mode of the line. The Setpoint can be set in Percent, MW, or Amps. When the dc line’s Setpoint is set in Percent, the Setpoint is set to the specified percentage of the contingency reference state Setpoint of the line and the Control Mode remains unchanged. If the Control Mode is presently Blocked, the resulting Setpoint will be 0 regardless of the Amount entered. When the Setpoint is set in MW, the Setpoint is set to the specified MW amount, and the Control Mode is changed to Power if the Control Mode is presently Current. If the Control Mode is Blocked or Power, then the Control Mode remains unchanged. When the Setpoint is set in Amps, the Setpoint is set to the specified current amount, and the Control Mode is set to Current if the Control Mode is presently Power. If the Control Mode is Blocked or Current, then the Control Mode remains unchanged.

The R (Ohms) setting will change the dc line's resistance to the specified Amount in ohms.

Change By

The Change By action will change the selected dc line’s Setpoint by the specified Amount and could possibly change the Control Mode of the line. The Setpoint can be changed in Percent, MW, or Amps. When the dc line’s Setpoint is changed in Percent, the Setpoint is changed by the specified percentage of the contingency reference state Setpoint of the line and the Control Mode remains unchanged. If the Control Mode is presently Blocked, the resulting Setpoint will be 0 regardless of the Amount entered. When the Setpoint is changed in MW, the Setpoint is changed by the specified MW amount, and the Control Mode is changed to Power if the Control Mode is presently Current. If the Control Mode is Blocked or Power, then the Control Mode remains unchanged. When the Setpoint is changed in Amps, the Setpoint is changed by the specified current amount, and the Control Mode is set to Current if the Control Mode is presently Power. If the Control Mode is Blocked or Current, the Control Mode remains unchanged.

When the Control Mode changes from either Power to Current or from Current to Power, the appropriate conversions are done so that the resulting Setpoint value reflects the original Setpoint and the change in Setpoint in the same units.