See Also
The definition of the dynamic behavior of a load in Simulator is done by assigning a combination of modules to a load record. These modules are generally depicted in the following image and then described below.
- Load Characteristic Models
- Multiple active characteristic can be assigned. It is possible to have two active together: one static model and one motor/dynamic model. Also, some special load models are composites of several load models (CMPLDW, CMLD, CLOD). Finally, there is a generic composite load model named CompLoad which can be defined as a list of other load models with fractions assigned.
- Load Distributed Generation Model Added in Version 19
- Each load record may be assigned to one active distributed generation model.
- Load Distribution Equivalent
- Typically the dynamic load model is modeled within the transient stability simulation at the terminal bus of the load record. Optionally, a Load Distribution Equivalent Type may be assigned to the load record which allows the load to be modeled at the end of a distribution transformer and a distribution feeder equivalent. See the Load Distribution Equivalent Type topic for more details.
- Also note, that any distributed generation model is also moved to the end of the equivalent.
- Load Relay Models
- Multiple load relay models may be assigned. They all act independently deciding how much of the load to trip.
There are also two special objects dedicated to making the specification of dynamic load models easier.
- Load Model Group
- An aggregation object specifically for dynamic models. Each load record can optionally be assigned to a Load Model Group. A Load Model Group can then have Distributed Generation Models and Characteristics assigned to it.
- Load model groups are identified simply by a Name. The expectation is that they groupings capture relationships in transient load characteristics and distributed generation which older aggregations such as Owner, Zone, or Area do not capture. Climate-based groupings such as "High Desert" would be a natural groups as would Economic-activity based grouping such as "Computer Server Farm" or "Mining Operation".
- Load Component Added in Version 20
- A Load Component is a special object used by the load characteristic named CompLoad. These together give you the ability to create any combination of other load models and give the user more flexibility that exists in the older composite load models such as CLOD, CMPLDW, and CMLD.
The relationships between some of these objects is depicted in the following image. For detailed information on how characteristics, distributed generation, distribution equivalents, and relay models are chosen for particular load see the specific help topics.
