Buildings.Electrical.AC.ThreePhasesBalanced.Loads
Package with load models for three-phase balanced AC systems
Information
This package contains models that represent different types of three phases balanced AC loads.
Extends from Modelica.Icons.VariantsPackage (Icon for package containing variants).
Package Content
| Name | Description |
|---|---|
 Capacitive
|
Model of a capacitive and resistive load |
 Impedance
|
Model of a resistive load |
 Inductive
|
Model of an inductive and resistive load |
 Resistive
|
Model of a resistive load |
 Examples
|
Package with example models |
Buildings.Electrical.AC.ThreePhasesBalanced.Loads.Capacitive
Model of a capacitive and resistive load
Information
Model of a capacitive load. See Buildings.Electrical.AC.OnePhase.Loads.Capacitive for more information.
Extends from Buildings.Electrical.AC.OnePhase.Loads.Capacitive (Model of a capacitive and resistive load).
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Modeling assumption | |||
| Boolean | linearized | false | If true, the load model is linearized |
| Load | mode | Buildings.Electrical.Types.L... | Type of load model (e.g., steady state, dynamic, prescribed power consumption, etc.) |
| Boolean | use_pf_in | false | If true, the power factor is defined by an input |
| Nominal conditions | |||
| Power | P_nominal | 0 | Nominal power (negative if consumed, positive if generated). Used if mode <> Buildings.Electrical.Types.Load.VariableZ_P_input [W] |
| Voltage | V_nominal.start | 480 | Nominal voltage (V_nominal >= 0) [V] |
| Real | pf | 0.8 | Power factor |
| Initialization | |||
| Current | i.start[:] | 0 | Current vector [A] |
| Power | P.start | 0 | Power of the load (negative if consumed, positive if fed into the electrical grid) [W] |
| Initialization | |||
| InitMode | initMode | Buildings.Electrical.Types.I... | Initialization mode for homotopy operator |
Connectors
| Type | Name | Description |
|---|---|---|
| input RealInput | y | Fraction of the nominal power consumed [1] |
| input RealInput | Pow | Power consumed [W] |
| Terminal_n | terminal | Generalized electric terminal |
| input RealInput | pf_in | Power factor [1] |
Modelica definition
model Capacitive "Model of a capacitive and resistive load"
extends Buildings.Electrical.AC.OnePhase.Loads.Capacitive(
redeclare Interfaces.Terminal_n terminal,
V_nominal(start=480));
end Capacitive;
Buildings.Electrical.AC.ThreePhasesBalanced.Loads.Impedance
Model of a resistive load
Information
Model of a three-phase balanced impedance.
If inductive=true, then the
inductance is a parameter, otherwise
the capacitance is a parameter.
The boolean parameter star is used to
select whether the star (Y) or triangle (D)
configuration is used to connect the impedance.
By default, the impedance is assumed to be connected
with a star configuration.
When the connection type changes from
star to triangle, the value of the impedance
is recomputed in such a way that the nominal power consumed by the impedance
does not change.
Extends from Buildings.Electrical.Interfaces.Impedance (Partial model representing a generalized impedance).
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| replaceable package PhaseSystem | PartialPhaseSystem | Phase system | |
| Boolean | inductive | true | If true, the load is inductive, otherwise it is capacitive |
| Resistance | R | 1 | Resistance [Ohm] |
| Inductance | L | 0 | Inductance [H] |
| Capacitance | C | 0 | Capacitance [F] |
| Boolean | star | true | Type of load connection: true = star, false = triangle |
| Initialization | |||
| Current | i.start[:] | 0 | Current vector [A] |
| Power | P.start | 0 | Power of the load (negative if consumed, positive if fed into the electrical grid) [W] |
| Initialization | |||
| InitMode | initMode | Buildings.Electrical.Types.I... | Initialization mode for homotopy operator |
| Variable load | |||
| Resistance | |||
| Boolean | use_R_in | false | If true, R is specified by an input |
| Resistance | RMin | 1e-4 | Minimum value of the resistance [Ohm] |
| Resistance | RMax | 1e2 | Maximum value of the resistance [Ohm] |
| Capacitance | |||
| Boolean | use_C_in | false | If true, C is specified by an input |
| Capacitance | CMin | 1e-4 | Minimum value of the capacitance [F] |
| Capacitance | CMax | 1e2 | Maximum value of the capacitance [F] |
| Inductance | |||
| Boolean | use_L_in | false | If true, L is specified by an input |
| Inductance | LMin | 1e-4 | Minimum value of the inductance [H] |
| Inductance | LMax | 1e2 | Maximum value of the inductance [H] |
Connectors
| Type | Name | Description |
|---|---|---|
| replaceable package PhaseSystem | Phase system | |
| input RealInput | y | Fraction of the nominal power consumed [1] |
| input RealInput | Pow | Power consumed [W] |
| Terminal_n | terminal | Generalized electric terminal |
| input RealInput | y_R | Input that sepecify variable R |
| input RealInput | y_C | Input that sepecify variable C |
| input RealInput | y_L | Input that sepecify variable L |
Modelica definition
model Impedance "Model of a resistive load"
extends Buildings.Electrical.Interfaces.Impedance(
redeclare package PhaseSystem = PhaseSystems.OnePhase,
redeclare Interfaces.Terminal_n terminal);
parameter Boolean star = true
"Type of load connection: true = star, false = triangle";
protected
Modelica.Units.SI.Angle theRef "Absolute angle of rotating reference system";
Modelica.Units.SI.AngularVelocity omega
"Frequency of the quasi-stationary sine waves";
Modelica.Units.SI.Reactance X(start=1) "Complex component of the impedance";
equation
theRef = PhaseSystem.thetaRef(terminal.theta);
omega = der(theRef);
// Inductance of each line
if inductive then
X = omega*L_internal;
else
X = -1/(omega*C_internal);
end if;
// Ohm's law
if star then
terminal.v = {{R_internal,-X}*terminal.i, {X,R_internal}*terminal.i};
else
terminal.v = {{R_internal/3,-X/3}*terminal.i, {X/3,R_internal/3}*terminal.i};
end if;
end Impedance;
Buildings.Electrical.AC.ThreePhasesBalanced.Loads.Inductive
Model of an inductive and resistive load
Information
Model of an inductive load. See Buildings.Electrical.AC.OnePhase.Loads.Inductive for more information.
Extends from Buildings.Electrical.AC.OnePhase.Loads.Inductive (Model of an inductive and resistive load).
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Modeling assumption | |||
| Boolean | linearized | false | If true, the load model is linearized |
| Load | mode | Buildings.Electrical.Types.L... | Type of load model (e.g., steady state, dynamic, prescribed power consumption, etc.) |
| Boolean | use_pf_in | false | If true, the power factor is defined by an input |
| Nominal conditions | |||
| Power | P_nominal | 0 | Nominal power (negative if consumed, positive if generated). Used if mode <> Buildings.Electrical.Types.Load.VariableZ_P_input [W] |
| Voltage | V_nominal.start | 480 | Nominal voltage (V_nominal >= 0) [V] |
| Real | pf | 0.8 | Power factor |
| Initialization | |||
| Current | i.start[:] | 0 | Current vector [A] |
| Power | P.start | 0 | Power of the load (negative if consumed, positive if fed into the electrical grid) [W] |
| Initialization | |||
| InitMode | initMode | Buildings.Electrical.Types.I... | Initialization mode for homotopy operator |
Connectors
| Type | Name | Description |
|---|---|---|
| input RealInput | y | Fraction of the nominal power consumed [1] |
| input RealInput | Pow | Power consumed [W] |
| Terminal_n | terminal | Generalized electric terminal |
| input RealInput | pf_in | Power factor [1] |
Modelica definition
model Inductive "Model of an inductive and resistive load"
extends Buildings.Electrical.AC.OnePhase.Loads.Inductive(
redeclare Interfaces.Terminal_n terminal,
V_nominal(start=480));
end Inductive;
Buildings.Electrical.AC.ThreePhasesBalanced.Loads.Resistive
Model of a resistive load
Information
Model of a resistive load. See Buildings.Electrical.AC.OnePhase.Loads.Resistive for more information.
Extends from Buildings.Electrical.AC.OnePhase.Loads.Resistive (Model of a resistive load).
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Modeling assumption | |||
| Boolean | linearized | false | If true, the load model is linearized |
| Load | mode | Buildings.Electrical.Types.L... | Type of load model (e.g., steady state, dynamic, prescribed power consumption, etc.) |
| Nominal conditions | |||
| Power | P_nominal | 0 | Nominal power (negative if consumed, positive if generated). Used if mode <> Buildings.Electrical.Types.Load.VariableZ_P_input [W] |
| Voltage | V_nominal.start | 480 | Nominal voltage (V_nominal >= 0) [V] |
| Initialization | |||
| Current | i.start[:] | 0 | Current vector [A] |
| Power | P.start | 0 | Power of the load (negative if consumed, positive if fed into the electrical grid) [W] |
| Initialization | |||
| InitMode | initMode | Buildings.Electrical.Types.I... | Initialization mode for homotopy operator |
Connectors
| Type | Name | Description |
|---|---|---|
| input RealInput | y | Fraction of the nominal power consumed [1] |
| input RealInput | Pow | Power consumed [W] |
| Terminal_n | terminal | Generalized electric terminal |
Modelica definition
model Resistive "Model of a resistive load"
extends Buildings.Electrical.AC.OnePhase.Loads.Resistive(
redeclare Interfaces.Terminal_n terminal,
V_nominal(start=480));
end Resistive;