modelBattery
Extends from Buildings.Electrical.Interfaces.PartialAcDcParameters (Partial model that contains basic parameters for a DC/AC conversion system).
Information
Simple model of a battery.
This model takes as an input the power to be extracted from the AC line and stored in the battery (if P > 0) or to be fed into the AC line after being extracted from the battery. The actual power stored or extracted in the battery differs from P due to AC/DC conversion losses and battery charge and discharge efficiencies.
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
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Units.SI.Efficiency | etaCha | 0.9 | Efficiency during charging |
| Modelica.Units.SI.Efficiency | etaDis | 0.9 | Efficiency during discharging |
| Real | SOC_start | Initial charge | |
| Modelica.Units.SI.Energy | EMax | Maximum available charge | |
| Modelica.Units.SI.Voltage | V_nominal | Nominal voltage (V_nominal >= 0) | |
| Boolean | linearized | false | If =true introduce a linearization in the load |
| AC-Conversion | |||
| Real | pf (from PartialAcDcParameters) | 0.9 | Power factor |
| Real | eta_DCAC (from PartialAcDcParameters) | 0.9 | Efficiency of DC/AC conversion |
| Initialization | |||
| Buildings.Electrical.Types.InitMode | initMode | Buildings.Electrical.Types.InitMode.zero_current | Initialization mode for homotopy operator |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Blocks.Interfaces.RealInput | P | Power stored in battery (if positive), or extracted from battery (if negative) | |
| Modelica.Blocks.Interfaces.RealOutput | SOC | State of charge | |
| Buildings.Electrical.AC.OnePhase.Interfaces.Terminal_p | terminal | Generalized terminal |
Contents
| Name | Description |
|---|---|
 PhaseSystem |
Revisions
-
December 6, 2021, by Michael Wetter:
Corrected wrong unit string.
This is for issue 2798. -
April 2, 2020 by Michael Wetter:
Corrected model and improved the documentation. The previous model extracted from the AC connector the input powerPplus the AC/DC conversion losses, butPshould be the power exchanged at the AC connector. Conversion losses are now only accounted for in the energy exchange at the battery.
This is for issue 1865. -
September 24, 2015 by Michael Wetter:
Removed binding ofP_nominalas this parameter is disabled and assigned a value in theinitial equationsection. This is for issue 426. -
September 4, 2014, by Michael Wetter:
Corrected problem, the losses due to AC/DC conversion have to affect both during the charge and the discharge. The input P is the power that is taken, due to conversions the actual power drain from the battery is higher. -
September 4, 2014, by Michael Wetter:
Revised model. -
August 5, 2014, by Marco Bonvini:
Revised documentation. -
January 8, 2013, by Michael Wetter:
First implementation.