Wye-Connected Load
Three-phase load wired in wye configuration
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Description
The Wye-Connected Load block models a three-phase load wired in a wye configuration. Each limb of the load can include any combination of a resistor (R), capacitor (C), and inductor (L), connected in series or in parallel.
You can specify values for the R, L, and C components directly in terms of resistance, inductance, and capacitance, or by rated powers at a rated voltage and frequency.
If you parameterize the block directly in terms or R, L, and C values, then for initialization, provide a three-element row vector of initial voltages for a capacitor, and a three-element row vector of initial currents for an inductor.
If you parameterize the block in terms of rated powers, then specify initial conditions in terms of an initial voltage, initial voltage phase, and initial frequency. For example, if the load is connected directly to a three-phase voltage source, then the initial conditions are identical to the source values for RMS line voltage, frequency, and phase shift. To specify zero initial-voltage magnitude, set the initial voltage to
0.
For certain combinations of R, L, and C, for some circuit topologies, specify parasitic resistance or conductance values that help the simulation to converge numerically. These parasitic terms ensure that an inductor has a small parallel resistive path and that a capacitor has a small series resistance. When you parameterize the block in terms of rated powers, the rated power values do not account for these small parasitic terms. The rated powers represent only the R, L, and C values of the load itself.
Block parameterization
The following two tables list the block parameters for each Component structure, based on the selected Parameterization option:
Specify by rated power
Specify component values directly
Specify by Rated Power
| Component Structure | Main Parameters | Parasitics Parameters | Initial Conditions Parameters |
|---|---|---|---|
| Rated voltage Real power | None | None |
| Rated voltage Rated electrical frequency Inductive reactive power | Parasitic parallel conductance | Terminal voltage magnitude Terminal voltage angle Frequency |
| Rated voltage Rated electrical frequency Capacitive reactive power | Parasitic series resistance | Terminal voltage magnitude Terminal voltage angle Frequency |
| Rated voltage Rated electrical frequency Real power Inductive reactive power | Parasitic parallel conductance | Terminal voltage magnitude Terminal voltage angle Frequency |
| Rated voltage Rated electrical frequency Real power Capacitive reactive power | None | Terminal voltage magnitude Terminal voltage angle Frequency |
| Rated voltage Rated electrical frequency Inductive reactive power Capacitive reactive power | Parasitic parallel conductance | Terminal voltage magnitude Terminal voltage angle Frequency |
| Rated voltage Rated electrical frequency Real power Inductive reactive power Capacitive reactive power | Parasitic parallel conductance | Terminal voltage magnitude Terminal voltage angle Frequency |
| Rated voltage Rated electrical frequency Real power Inductive reactive power | None | Terminal voltage magnitude Terminal voltage angle Frequency |
| Rated voltage Rated electrical frequency Real power Capacitive reactive power | Parasitic series resistance | Terminal voltage magnitude Terminal voltage angle Frequency |
| Rated voltage Rated electrical frequency Inductive reactive power Capacitive reactive power | Parasitic series resistance | Terminal voltage magnitude Terminal voltage angle Frequency |
| Rated voltage Rated electrical frequency Real power Inductive reactive power Capacitive reactive power | Parasitic series resistance | Terminal voltage magnitude Terminal voltage angle Frequency |
Specify Component Values Directly
| Component Structure | Main Parameters | Parasitics Parameters | Initial Conditions Parameters |
|---|---|---|---|
| Resistance | None | None |
| Inductance | Parasitic parallel conductance | Initial inductor current [ Ia Ib Ic ] |
| Capacitance | Parasitic series resistance | Initial capacitor voltage [ Va Vb Vc ] |
| Resistance Inductance | Parasitic parallel conductance | Initial inductor current [ Ia Ib Ic ] |
| Resistance Capacitance | None | Initial capacitor voltage [ Va Vb Vc ] |
| Inductance Capacitance | Parasitic parallel conductance | Initial inductor current [ Ia Ib Ic ] Initial capacitor voltage [ Va Vb Vc ] |
| Resistance Inductance Capacitance | Parasitic parallel conductance | Initial inductor current [ Ia Ib Ic ] Initial capacitor voltage [ Va Vb Vc ] |
| Resistance Inductance | None | Initial inductor current [ Ia Ib Ic ] |
| Resistance Capacitance | Parasitic series resistance | Initial capacitor voltage [ Va Vb Vc ] |
| Inductance Capacitance | Parasitic series resistance | Initial inductor current [ Ia Ib Ic ] Initial capacitor voltage [ Va Vb Vc ] |
| Resistance Inductance Capacitance | Parasitic series resistance | Initial inductor current [ Ia Ib Ic ] Initial capacitor voltage [ Va Vb Vc ] |
Variables
Use the Variables tab to specify the priority and initial target values for the block variables before simulation. For more information, see Set Priority and Initial Target for Block Variables.
To enable the Variables tab, set the
Parameterization parameter to Specify
component values directly. The tab is not visible if you set
Component structure to R.
