Contingency Element Type: Generator

 

The following describes the options available when creating a contingency element of type Generator. 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 Status of the selected generator to Open if the generator Status is Closed. If the generator Status is already Open, this action does nothing.

When using the Open action, the Make-up Power Sources button is enabled and power sources can be specified to account for the changes in generation due to the contingency action.

Open Breakers

See the special topic on Open Breakers for more detail.

Close

The Close action will set the Status of the selected generator to Closed if the generator Status is Open. If the generator Status is already Closed, this action does nothing.

When using the Close action, the Make-up Power Sources button is enabled and power sources can be specified to account for the changes in generation due to the contingency action.

Close Breakers

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

Move

The Move action allows the transferring of generation from an existing generator bus to another bus in a specified Amount. A generator move can be done on a bus basis (impacting the total generation of all generators at the selected bus) or can be targeted at a specific generator. Generators that are adjusted by the Move action will have their AGC Status set to No. If there are no on-line generators at the selected generator bus, no generation move will occur. Generation may be moved in Percent or MW. A Percent move will move the specified percent of the contingency reference state generator MW and Mvar to the defined Bus to Move to. A MW move will move the specified amount of generator MW to the Bus to Move to. The Move amount can be either positive or negative. A positive amount will decrease the output of the selected generator bus, and a negative amount will increase the output of the selected generator bus. The Bus to Move to will respond accordingly.

If a generator already exists at the bus to which the generation is being moved, the generation at that bus is adjusted according to the move amount. If a generator does not exist but a load exists, then the load is adjusted by the move amount. If no generator or load exists, then a load is added at the bus and the injection is set according to the move amount. In terms of power injection, positive generation is the same as negative load.

Move actions are not allowed for Contingency Primary Elements used with CTG Combo Analysis.

Set To

The Set To action will set the selected bus’ generation or specified generator's parameters to a specified Amount. Generator Set To actions can be done on a bus basis (impacting the total generation of all generators at the selected bus) or can be targeted at a specified generator. Generators that are adjusted by a Set To action will have their AGC Status set to No. If there are no on-line generators at the selected generator bus, no generation change will occur. Generator parameters can be set in Percent, MW, Mvar or Setpoint Voltage. When the generation is set in Percent, total generator MW output will be set to a value based on the specified percent of the contingency reference state total generator MW output. When the generation is set in MW, total generator MW output will be set to the specified MW amount. When the generation is set in Mvar, total generator Mvar output will be set to the specified Mvar amount (AVR is set to NO). When the generation is set in Setpoint Voltage, the voltage set-point of all generators at the selected bus will be set to the specified amount in per unit.

When using the Set To action, the Make-up Power Sources button is enabled and power sources can be specified to account for the changes in generation due to the contingency action.

Change By

The Change By action will change the selected bus’ generation or specified generator's parameters by a specified Amount. Generator Change By actions can be done on a bus basis (impacting the total generation of all generators at the selected bus) or can be targeted at a specified generator. Generators that are adjusted by a Change By action will have their AGC Status set to No. If there are no on-line generators at the selected generator bus, no generation change will occur. Generator parameters can be changed in Percent, MW, Mvar or Setpoint Voltage. When the change is in Percent, total generator MW output will be changed based on the specified percent of the contingency reference state total generator MW output. When the change is in MW, total generator MW output will be changed by the specified MW amount. When the change is in Mvar, total generator Mvar output will be changed by the specified Mvar amount (AVR is set to NO). When the change is in Setpoint Voltage, the voltage set-point of all generators at the selected bus will be changed by the specified amount in per unit.

When using the Change By action, the Make-up Power Sources button is enabled and power sources can be specified to account for the changes in generation due to the contingency action.