Buildings.Electrical.AC.OnePhase.Storage

This package contains models for storage elements with an AC one phase connector.

Package Content

Name	Description
Battery	Simple model of a battery
Examples	Package with example models

Buildings.Electrical.AC.OnePhase.Storage.Battery

Information

This model takes as an input the power to be stored in the battery (if P > 0) or to be extracted from the battery. This model has a one phase AC connector and takes into account the efficiency of the conversion between DC and AC η_DCAC.

The output connector SOC is the state of charge of the battery. This model does not enforce that the state of charge is between zero and one. However, each time the state of charge crosses zero or one, a warning will be written to the simulation log file. The model also does not limit the current through the battery. The user should provide a control so that only a reasonable amount of power is exchanged, and that the state of charge remains between zero and one.

Parameters

Connectors

Modelica definition

Type	Name	Default	Description
replaceable package PhaseSystem	Buildings.Electrical.PhaseSy...	Phase system
Real	etaCha	0.9	Efficiency during charging [1]
Real	etaDis	0.9	Efficiency during discharging [1]
Real	SOC_start		Initial charge
Energy	EMax		Maximum available charge [J]
Voltage	V_nominal		Nominal voltage (V_nominal >= 0) [V]
Boolean	linearized	false	If =true introduce a linearization in the load
Terminal_p	terminal	redeclare Buildings.Electric...	Generalized terminal
AC-Conversion
Real	pf	0.9	Power factor
Real	eta_DCAC	0.9	Efficiency of DC/AC conversion
Initialization
InitMode	initMode	Buildings.Electrical.Types.I...	Initialization mode for homotopy operator

Type	Name	Description
replaceable package PhaseSystem	Phase system
input RealInput	P	Power stored in battery (if positive), or extracted from battery (if negative) [W]
output RealOutput	SOC	State of charge
Terminal_p	terminal	Generalized terminal

model Battery "Simple model of a battery" extends Buildings.Electrical.Interfaces.PartialAcDcParameters; replaceable package PhaseSystem = Buildings.Electrical.PhaseSystems.OnePhase constrainedby Buildings.Electrical.PhaseSystems.PartialPhaseSystem "Phase system"; parameter Real etaCha(min=0, max=1, unit="1") = 0.9 "Efficiency during charging"; parameter Real etaDis(min=0, max=1, unit="1") = 0.9 "Efficiency during discharging"; parameter Real SOC_start(start=0.1) "Initial charge"; parameter Modelica.SIunits.Energy EMax(min=0, displayUnit="kWh") "Maximum available charge"; parameter Modelica.SIunits.Voltage V_nominal(start = 110) "Nominal voltage (V_nominal >= 0)"; parameter Boolean linearized=false "If =true introduce a linearization in the load"; parameter Buildings.Electrical.Types.InitMode initMode( min=Buildings.Electrical.Types.InitMode.zero_current, max=Buildings.Electrical.Types.InitMode.linearized) = Buildings.Electrical.Types.InitMode.zero_current "Initialization mode for homotopy operator"; Modelica.Blocks.Interfaces.RealInput P(unit="W") "Power stored in battery (if positive), or extracted from battery (if negative)"; Modelica.Blocks.Interfaces.RealOutput SOC "State of charge"; replaceable Buildings.Electrical.AC.OnePhase.Interfaces.Terminal_p terminal "Generalized terminal"; protected Buildings.Electrical.DC.Storage.BaseClasses.Charge cha( final EMax=EMax, final SOC_start=SOC_start, final etaCha=etaCha, final etaDis=etaDis) "Charge model"; replaceable Buildings.Electrical.AC.OnePhase.Loads.Resistive bat constrainedby Buildings.Electrical.Interfaces.Load( final initMode = initMode, final P_nominal=0, final mode=Buildings.Electrical.Types.Load.VariableZ_P_input, final V_nominal=V_nominal, final linearized=linearized) "Power exchanged with battery pack"; Modelica.Blocks.Math.Gain gain(final k=-1) "Gain that invert sign of the power (P<0 -> the load is consumed)"; Modelica.Blocks.Math.Gain acdc_con_dis(final k = 2 - eta_DCAC) "Losses when P < 0"; Buildings.Utilities.Math.Splice spl(deltax=1e-2) "Splice function that attributes the losses due to AC/DC conversion"; Modelica.Blocks.Math.Gain acdc_con_cha(final k=eta_DCAC) "Losses when P > 0"; equation connect(cha.SOC, SOC); connect(gain.y, bat.Pow); connect(bat.terminal, terminal); connect(P, acdc_con_dis.u); connect(P, acdc_con_cha.u); connect(acdc_con_cha.y, spl.u1); connect(acdc_con_dis.y, spl.u2); connect(P, spl.x); connect(spl.y, gain.u); connect(spl.y, cha.P); end Battery;