Buildings.Electrical.AC.ThreePhasesBalanced.Lines

Package with line models for three-phase balanced AC systems

Information

This package contains models for transmission lines and electrical networks.

Extends from Modelica.Icons.Package (Icon for standard packages).

Package Content

Name	Description
Line	Model of an electrical line
Network	Three phases balanced AC network
TwoPortInductance	Model of an inductance with two electrical ports
TwoPortRL	Model of a resistive-inductive element with two electrical ports
TwoPortRLC	Model of a RLC element with two electrical ports
TwoPortResistance	Model of a resistance with two electrical ports
Examples	Package with example models

Buildings.Electrical.AC.ThreePhasesBalanced.Lines.Line

Model of an electrical line

Buildings.Electrical.AC.ThreePhasesBalanced.Lines.Line

Information

This model represents a cable for three-phase balanced AC systems. The model is based on Buildings.Electrical.AC.ThreePhasesBalanced.Lines.TwoPortRLC and provides functionalities to parametrize the values of R, L and C either using commercial cables or using default values.

See model Buildings.Electrical.AC.OnePhase.Lines.Line for more information.

Extends from Buildings.Electrical.AC.OnePhase.Lines.Line (Model of an electrical line).

Parameters

Type	Name	Default	Description
Length	l		Length of the line [m]
Power	P_nominal		Nominal power of the line [W]
Model
Assumptions
Boolean	use_C	false	Set to true to add a capacitance in the center of the line
Load	modelMode	Buildings.Electrical.Types.L...	Select between steady state and dynamic model
Thermal
Boolean	use_T	false	If true, enables the input for the temperature of the cable
Temperature	TCable	T_ref	Fixed temperature of the cable [K]
Tech. specification
Auto/Manual mode
CableMode	mode	Buildings.Electrical.Types.C...	Select if choosing the cable automatically or between a list of commercial options
Manual mode
Generic	commercialCable	Buildings.Electrical.Transmi...	Commercial cables options

Connectors

Type	Name	Description
input RealInput	T	Temperature of the cable

Modelica definition

model Line "Model of an electrical line" extends Buildings.Electrical.AC.OnePhase.Lines.Line( redeclare Interfaces.Terminal_n terminal_n, redeclare Interfaces.Terminal_p terminal_p, V_nominal(start=480), redeclare TwoPortRLC line( R=R, L=L, C=C, V_nominal=V_nominal)); end Line;

Buildings.Electrical.AC.ThreePhasesBalanced.Lines.Network

Three phases balanced AC network

Buildings.Electrical.AC.ThreePhasesBalanced.Lines.Network

Information

This model represents a generalized electrical AC three-phase balanced network.

See Buildings.Electrical.Transmission.BaseClasses.PartialNetwork for information about the network model.

See Buildings.Electrical.Transmission.Grids.PartialGrid for more information about the topology of the network, such as the number of nodes, how they are connected, and the length of each connection.

Extends from Buildings.Electrical.Transmission.BaseClasses.PartialNetwork (Partial model that represent an electric network).

Modelica definition

model Network "Three phases balanced AC network" extends Buildings.Electrical.Transmission.BaseClasses.PartialNetwork( V_nominal(start=480), redeclare Interfaces.Terminal_p terminal, redeclare replaceable Transmission.Grids.TestGrid2Nodes grid, redeclare Lines.Line lines(redeclare replaceable Buildings.Electrical.Transmission.LowVoltageCables.Generic commercialCable=grid.cables)); Modelica.SIunits.Voltage VAbs[grid.nNodes] "RMS voltage of the grid nodes"; equation for i in 1:grid.nLinks loop connect(lines[i].terminal_p, terminal[grid.fromTo[i, 1]]); connect(lines[i].terminal_n, terminal[grid.fromTo[i, 2]]); end for; for i in 1:grid.nNodes loop VAbs[i] = Buildings.Electrical.PhaseSystems.OnePhase.systemVoltage(terminal[ i].v); end for; end Network;

Buildings.Electrical.AC.ThreePhasesBalanced.Lines.TwoPortInductance

Model of an inductance with two electrical ports

Buildings.Electrical.AC.ThreePhasesBalanced.Lines.TwoPortInductance

Information

Inductance that connects two AC three-phase balanced interfaces. This model can be used to represent a cable in a three-phase balanced AC system.

See model Buildings.Electrical.AC.OnePhase.Lines.TwoPortInductance for more information.

Extends from Buildings.Electrical.AC.OnePhase.Lines.TwoPortInductance (Model of an inductive element with two electrical ports).

Parameters

Type	Name	Default	Description
Inductance	L		Inductance [H]
Modeling assumption
Load	mode	Buildings.Electrical.Types.L...	Type of model (e.g., steady state, dynamic, prescribed power consumption, etc.)

Modelica definition

model TwoPortInductance "Model of an inductance with two electrical ports" extends Buildings.Electrical.AC.OnePhase.Lines.TwoPortInductance(redeclare Interfaces.Terminal_n terminal_n, redeclare Interfaces.Terminal_p terminal_p); end TwoPortInductance;

Buildings.Electrical.AC.ThreePhasesBalanced.Lines.TwoPortRL

Model of a resistive-inductive element with two electrical ports

Buildings.Electrical.AC.ThreePhasesBalanced.Lines.TwoPortRL

Information

Resistive-inductive impedance that connects two AC three-phase balanced interfaces. This model can be used to represent a cable in a three-phase balanced AC system.

See model Buildings.Electrical.AC.OnePhase.Lines.TwoPortRL for more information.

Extends from Buildings.Electrical.AC.OnePhase.Lines.TwoPortRL (Model of a resistive-inductive element with two electrical ports).

Parameters

Type	Name	Default	Description
Boolean	useHeatPort	false	=true, if heatPort is enabled
Temperature	T	T_ref	Fixed device temperature if useHeatPort = false [K]
Resistance	R		Resistance at temperature T_ref [Ohm]
Temperature	T_ref	298.15	Reference temperature [K]
Temperature	M	507.65	Temperature constant (R_actual = R*(M + T_heatPort)/(M + T_ref)) [K]
Inductance	L		Inductance [H]
Current	i_start[PhaseSystem_p.n]	zeros(PhaseSystem_p.n)	Initial current phasor of the line (positive if entering from terminal p) [A]
Modeling assumption
Load	mode	Buildings.Electrical.Types.L...	Type of model (e.g., steady state, dynamic, prescribed power consumption, etc.)

Connectors

Type	Name	Description
HeatPort_a	heatPort	Conditional heat port

Modelica definition

model TwoPortRL "Model of a resistive-inductive element with two electrical ports" extends Buildings.Electrical.AC.OnePhase.Lines.TwoPortRL(redeclare Interfaces.Terminal_n terminal_n, redeclare Interfaces.Terminal_p terminal_p); end TwoPortRL;

Buildings.Electrical.AC.ThreePhasesBalanced.Lines.TwoPortRLC

Model of a RLC element with two electrical ports

Buildings.Electrical.AC.ThreePhasesBalanced.Lines.TwoPortRLC

Information

RLC impedance that connects two AC three-phase balanced interfaces. This model can be used to represent a cable in a three-phase balanced AC system.

See model Buildings.Electrical.AC.OnePhase.Lines.TwoPortRLC for more information.

Extends from Buildings.Electrical.AC.OnePhase.Lines.TwoPortRLC (Model of an RLC element with two electrical ports).

Parameters

Type	Name	Default	Description
Boolean	useHeatPort	false	=true, if heatPort is enabled
Temperature	T	T_ref	Fixed device temperature if useHeatPort = false [K]
Resistance	R		Resistance at temperature T_ref [Ohm]
Temperature	T_ref	298.15	Reference temperature [K]
Temperature	M	507.65	Temperature constant (R_actual = R*(M + T_heatPort)/(M + T_ref)) [K]
Capacitance	C		Capacity [F]
Inductance	L		Inductance [H]
Voltage	Vc_start[2]	{V_nominal,0}	Initial voltage phasor of the capacitance located in the middle of the line [V]
Nominal conditions
Voltage	V_nominal	V_nominal(start=110)	Nominal voltage (V_nominal >= 0) [V]
Modeling assumption
Load	mode	Buildings.Electrical.Types.L...	Type of model (e.g., steady state, dynamic, prescribed power consumption, etc.)

Connectors

Type	Name	Description
HeatPort_a	heatPort	Conditional heat port

Modelica definition

model TwoPortRLC "Model of a RLC element with two electrical ports" extends Buildings.Electrical.AC.OnePhase.Lines.TwoPortRLC(redeclare Interfaces.Terminal_n terminal_n, redeclare Interfaces.Terminal_p terminal_p); end TwoPortRLC;

Buildings.Electrical.AC.ThreePhasesBalanced.Lines.TwoPortResistance

Model of a resistance with two electrical ports

Buildings.Electrical.AC.ThreePhasesBalanced.Lines.TwoPortResistance

Information

Resistance that connects two AC three-phase balanced interfaces. This model can be used to represent a cable in a three-phase balanced AC system.

See model Buildings.Electrical.AC.OnePhase.Lines.TwoPortResistance for more information.

Extends from Buildings.Electrical.AC.OnePhase.Lines.TwoPortResistance (Model of a resistance with two electrical ports).

Parameters

Type	Name	Default	Description
Boolean	useHeatPort	false	=true, if heatPort is enabled
Temperature	T	T_ref	Fixed device temperature if useHeatPort = false [K]
Resistance	R		Resistance at temperature T_ref [Ohm]
Temperature	T_ref	298.15	Reference temperature [K]
Temperature	M	507.65	Temperature constant (R_actual = R*(M + T_heatPort)/(M + T_ref)) [K]

Connectors

Type	Name	Description
HeatPort_a	heatPort	Conditional heat port

Modelica definition

model TwoPortResistance "Model of a resistance with two electrical ports" extends Buildings.Electrical.AC.OnePhase.Lines.TwoPortResistance(redeclare Interfaces.Terminal_n terminal_n, redeclare Interfaces.Terminal_p terminal_p); end TwoPortResistance;