Time Step Simulation: Schedule Subscription Dialog
See Also
Simulator objects have a large number of fields, which can be classified as numeric, boolean, or text. Numeric fields, whether integer or real, can subscribe to Numeric Schedules, boolean fields can subscribe to Yes/No Schedules, and text fields can subscribe to Text Schedules. Thus, a condition for a field to subscribe to a schedule is that a schedule of its type be already defined.
The dialog includes the following options:
Active
Indicates that the schedule subscription is active. If this box is not checked, the schedule subscription is defined, but no schedule action will be applied to the power system.
Object Type
Use this selector to specify the object type that you want to subscribe to a schedule. Currently, Simulator supports Generators, Loads, Line/Transformers, Shunts, Areas, Transactions, Zones, Interfaces, and DC Lines. When you select an Object Type, three things happen:
- The Object ID list is populated with the elements of the object type present in the power flow case and the first element is displayed by default.
- The Field selector is populated with the enterable fields corresponding to that particular Object Type and the first field is displayed by default.
- The type of the first field (Numeric, Yes/No or Text) is identified and the Schedule selector is populated with the existing schedules of that type.
Object ID
Use this selector to specify the particular object of a particular Object Type whose field you want to subscribe to a schedule. The Object ID has above it a string that indicates how the ID of the object is built depending on the Object Type. For instance, when the Object Type is Generator, the Object ID is specified as the Bus Number and then the Gen ID.
Select/View Objects
Press this button to bring up the Add Schedule Subscribers Dialog. This dialog is used to select multiple objects of the specified type, for which a field will subscribe to the schedule. When multiple objects are selected, the Object ID indicates "Multiple Objects" followed by the number of objects that will be selected. If there are objects whose fields are subscribed to a schedule, these objects will appear in the right side selection list, because they are currently subscribing to the schedule.
Field
Use this selector to indicate the particular Field that you want to subscribe to a schedule. Depending on the type, the Dialog indicates whether the Field should subscribe to a Numeric, Yes/No, or Text schedule. Once you have selected the Field, the Schedule selector is populated only with the schedules of that particular type.
Schedule
Use this selector to specify the schedule to which the Field should be subscribed.
Time Shift
The time shift options can be used to Delay or Advance applying the scheduled actions by the specified Delay Days, Delay Hours, Delay Minutes, or Delay Seconds. For instance, suppose that you have setup a schedule so that a new 100 MW generating unit enters online on March 10th. The entering schedule is complex and consists of increasing the output in steps of 20 MW each hour starting at 10 am. Suppose that due to unexpected events, the connection of the unit must be put off by two days. Instead of modifying the entire schedule, you could set a 2 day Delay so that the unit enters online on March 12th at 10 am.
If instead the new unit can go online ahead of schedule on March 8th, the Time Shift can be set to Advance for 2 days so that the unit will go online earlier.
Subscription Type
In addition to the time shift, the value "shape" defined by a numeric schedule can be altered by making the subscription Relative.
Absolute
Select this option so that the field takes the exact value specified in the schedule.
Relative
The numeric values of the schedule can be altered by a Multiplier and a Value Shift. In this linear modification, the value of the field that is applied to the power system will be equal to:
Actual Field Value = Multiplier * Schedule Value + Value Shift