Powerflow Object

Along with all of the properties inherited from either node or link, all objects within the powerflow module inherit two basic properties. These two properties are the phases of the object and the nominal voltage for that area of the system. These are expressed in the phases and nominal_voltage parameters of powerflow objects.

The phases property has a variety of valid inputs. These are:

• A - Phase A of a three phase connection
• B - Phase B of a three phase connection
• C - Phase C of a three phase connection
• D - Delta connected phases - this implies ABC, but explicitly specifying them is recommended
• N - Neutral phase
• G - Ground phase
• S - Split phase - this represents residential level wires (2 "hot" and 1 neutral wire)

These different phases can be specified in a variety of ways. Below are some identical examples with a simple node object (which is covered in more later in this page).

object node {
    phases ABC;
    }



object node {
    phases "ABC";
    }



object node {
    phases A|B|C;
    }



object node {
    phases "A|B|C";
    }

The other common property is nominal voltage, which is passed into the objects using the nominal_voltage parameter. This parameter is used to ensure connected objects are in the proper region (have the same nominal voltage) and also to specify an initial value for the convergence criteria of the different solver methods. Using the same node example, a 7200 Volt nominal voltage would be expressed as:

object node {
    nominal_voltage 7200.0;
    }

Powerflow Object Parameters

Properties

powerflow_object does not declare inherited parent classes.

The I/O column indicates whether a property is user-settable input (I), simulation-computed output (O), or both (IO).

Table 1: owerflow_object table 1

Property Name	Type	Unit	I/O	Description
phases	set	N/A	I	Valid values: G, S, N, D, C, B, A.
nominal_voltage	double	V	I
inrush_integration_method	enumeration	N/A	I	Integration method for in-rush Valid values: NONE, TRAPEZOIDAL, BACKWARD_EULER.
condition	set	N/A	IO	Valid values: OPEN, CONTACT, NORMAL, SN, S2, S1, G, N, C, B, A.
solution	enumeration	N/A	IO	Valid values: NORMAL, OUTAGE.