Lesson 2 - Static Loads

The goal of this lesson is to familiarize you with the various ways of modeling loads in GridLAB-D. The specific learning objectives are the following

1. How to modify an existing static load.
2. How to add static loads of different types.
3. How to remove a static load.
4. How to create new load objects.

Static Load Models

Loads can be either static (i.e., constant power, current, and/or impedance). The load composition can be specified in a variety of way including (1) the real and reactive parts, (2) the magnitudes and angles by phase, and (3) the total load and fractions by phase with the power factors. In addition, loads can be specified as 3-phase in delta or wye configuration, or as triplex loads on a split phase.

Tasks

The following tasks are illustrated in main.glm:

1. Modify existing static loads
   1. Change constant power load on phase A of load_1 to 48 kW real power and 24 VAr reactive power (See main.glm@6).
   2. Add constant impedance load to phase B of load_2 at 100 Ohm resistance and 10 Ohm reactance (See main.glm@9).
   3. Remove constant power load on phase C of load_4 by setting it to 0+0j complex power (See main.glm@12).
2. Create new static loads
   1. Add load_115 to load_114 through line_114to115 (See main.glm@15). Copy the load from load_114.
   2. Connect load_116 directly to load_115 (See main.glm@34). Double the load from load_114.

Exercises

1. Change the constant power load on load_116 to an equivalent constant current load. (Hint: the constant_current = constant_power / nominal_voltage.)

More Information

• Static (ZIP) Models
• PQ Models
• Triplex Models
• Motor Models
• Variable Frequency Drive Models
• Advanced Loads
  • Building Models
  • Agricultural Models
  • Industrial Models
  • Public Service Models

Next Lesson

• Lesson 3 - Generators