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

Buildings.Electrical.AC.ThreePhasesBalanced.Loads.Capacitive

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]
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

Buildings.Electrical.AC.ThreePhasesBalanced.Loads.Impedance

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]
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

Buildings.Electrical.AC.ThreePhasesBalanced.Loads.Inductive

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]
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

Buildings.Electrical.AC.ThreePhasesBalanced.Loads.Resistive

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]

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;