Model Associated with Measurement Object

In many cases, load characteristic model open and close loads during a simulation. This cause loads to disconnect and connect MW or MVArs during a transient stability run. In order to keep track of the quantities of load been connected or disconnected a measurement object model was created in PowerWorld.

To handle this, Simulator's Transient Stability tool has always allowed you to assign load models to objects such as the entire system, an Area, a Zone, an Owner, or a Bus. In order to keep track of specific load models inside a load model stability model such as the CMPLDW the measurement object was created. It will assign a measurement object to an object or aggregation object. The measurement object will be in charge of a particular load model in the object and will keep track of specific quantities or models inside the load model.

The measurement Objects will be located in the Transient Stability under Measurement Object Models.

There are two ways to create a new Measurement Object:

Dialog:

In the Transient Stability folder under Measurement Object Models in the Model Explorer, right click and hit Insert. This will open a dialog:

To add a new model just click the Insert button. A dialog will appear prompting you to choose which measurement object model to add for the object. To attached the measurement object to a particular object the measurement object will have a Measurement Object parameter. This is a link to the object the measurement object will be attached to perform the measurement. By clicking Choose a dialog will pop up that will have the available object types and objects the measurement object can perform measurements:

After the object is selected the measurement object is ready to be used during the Transient Stability simulation

Aux File:

A new Measuremetn object can be added by using an aux file. For example, the measurement object CMPLDWDemo measured the Delta MW change of the Motor X (Mtypa). To assign the measurement object CMPLDWDemo to the load model at bus number 5 the user will have to use the following script section in an aux file:

 

DATA (MeasurementObjectModel_CMPLDWDemo, [WhoAmIMeasuring,ObjectType,DefaultData,Status,SubIntervals])

{

"Load '5' '1'" "LDTRPMON" "Default" "Active" ""

}

 

The WhoAmIMeasuring is the Object ID of the Load object. If the measurement object need to be assigned to an aggregation object like Area, Zone or Owner the Object ID will be the Object ID of the aggregation object. The Object Type here means the type of measurement object that particular object is attached to be performing measurements.

 

New measurement objects can be added as user requests. Please contact PowerWorld for more information.