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Update units and parameter propagation #42

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Update units and parameter propagation #42

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e4732f4
Updated units and parameter propagation
benjamsy Feb 21, 2023
daad3d2
Remove long unit paths
benjamsy Mar 15, 2023
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6 changes: 3 additions & 3 deletions VirtualFCS/Control/BatteryManagementSystem.mo
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Expand Up @@ -2,8 +2,8 @@ within VirtualFCS.Control;

model BatteryManagementSystem "Implement algorithms for the control of battery systems."
parameter Real N_s "Number of Cells in Series";
parameter Real lowerVoltageLimit = N_s * 2;
parameter Real upperVoltageLimit = N_s * 3.6;
parameter Modelica.Units.SI.Voltage lowerVoltageLimit = N_s * 2;
parameter Modelica.Units.SI.Voltage upperVoltageLimit = N_s * 3.6;
VirtualFCS.Control.ChargeCounter chargeCounter annotation(
Placement(visible = true, transformation(origin = {25, -1}, extent = {{25, -25}, {-25, 25}}, rotation = 0)));
Modelica.Electrical.Analog.Interfaces.NegativePin pin_n_battery annotation(
Expand Down Expand Up @@ -47,4 +47,4 @@ equation
Icon(graphics = {Rectangle(fillColor = {50, 50, 50}, fillPattern = FillPattern.Solid, extent = {{-100, 100}, {100, -100}}), Text(origin = {2, 72}, lineColor = {255, 255, 255}, extent = {{-26, 22}, {26, -22}}, textString = "Load"), Text(origin = {0, -52}, lineColor = {255, 255, 255}, extent = {{-44, 34}, {48, -36}}, textString = "Battery"), Text(origin = {104, 146}, lineColor = {0, 0, 255}, extent = {{-26, 22}, {84, -80}}, textString = "%name"), Text(origin = {62, 24}, lineColor = {255, 255, 255}, extent = {{-44, 34}, {26, -24}}, textString = "SOC_init"), Text(origin = {106, -52}, lineColor = {255, 255, 255}, extent = {{-44, 34}, {-8, 10}}, textString = "Q")}, coordinateSystem(extent = {{-150, -100}, {150, 100}}, initialScale = 0.1)),
Diagram(coordinateSystem(extent = {{-150, -100}, {150, 100}})),
Documentation(info = "<html><head></head><body>The BatteryManagementSystem component is responsible for protecting the battery pack. It ensures that the pack is not overcharged or overdischarged to dangerous state-of-charge levels. It also limits the maximum charging and discharging current the battery pack can support.</body></html>"));
end BatteryManagementSystem;
end BatteryManagementSystem;
2 changes: 1 addition & 1 deletion VirtualFCS/Control/EMS_FC.mo
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@@ -1,7 +1,7 @@
within VirtualFCS.Control;

block EMS_FC
parameter Real ramp_up(unit = "1/s") = 20 "FC stack current ramp up rate";
parameter Modelica.Units.SI.TimeAging ramp_up = 20 "FC stack current ramp up rate";
Modelica.Blocks.Math.Abs abs1 annotation(
Placement(visible = true, transformation(origin = {70, 0}, extent = {{-10, -10}, {10, 10}}, rotation = 0)));
Modelica.Blocks.Sources.Constant OFF(k = 0) annotation(
Expand Down
10 changes: 6 additions & 4 deletions VirtualFCS/Control/EnergyManagementSystem.mo
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@@ -1,11 +1,13 @@
within VirtualFCS.Control;

block EnergyManagementSystem "Implement algorithms to control the energy and power distribution in a hybrid system."
parameter Real I_nom_FC_stack(unit = "A") = 100 "FC stack nominal operating current";
parameter Real ramp_up(unit = "1/s") = 20 "FC stack current ramp up rate";
parameter Modelica.Units.SI.Current I_nom_FC_stack = 100 "FC stack nominal operating current";
parameter Modelica.Units.SI.TimeAging ramp_up = 20 "FC stack current ramp up rate";
parameter Real SOC_lower_limit(unit = "1") = 0.2 "SOC lower limit";
parameter Real SOC_higher_limit(unit = "1") = 0.8 "SOC lower limit";
Comment on lines +6 to +7
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Have you considered declaring e.g. type StateOfChargeRatio = Modelica.Units.SI.DimensionlessRatio(min = 0, max = 1) as type for all SOC parameters (also in other model files)?

Modelica.Blocks.Sources.Constant shut_down(k = 0) annotation(
Placement(visible = true, transformation(origin = {-70, 40}, extent = {{-10, -10}, {10, 10}}, rotation = 0)));
Modelica.Blocks.Logical.Hysteresis hysteresis(pre_y_start = true, uHigh = 0.8, uLow = 0.2) annotation(
Modelica.Blocks.Logical.Hysteresis hysteresis(pre_y_start = true, uHigh = SOC_higher_limit, uLow = SOC_lower_limit) annotation(
Placement(visible = true, transformation(origin = {-70, 0}, extent = {{-10, -10}, {10, 10}}, rotation = 0)));
Modelica.Blocks.Sources.Constant setFuelCellCurrent(k = -I_nom_FC_stack) annotation(
Placement(visible = true, transformation(origin = {-70, -40}, extent = {{-10, -10}, {10, 10}}, rotation = 0)));
Expand Down Expand Up @@ -37,4 +39,4 @@ equation
annotation(
Icon(graphics = {Rectangle(fillColor = {50, 50, 50}, fillPattern = FillPattern.Solid, extent = {{-100, 100}, {100, -100}}), Text(origin = {-8, 121}, lineColor = {0, 0, 255}, extent = {{-54, 17}, {54, -17}}, textString = "%name")}, coordinateSystem(initialScale = 0.1)),
Documentation(info = "<html><head></head><body><div>The EnergyManagementSystem component is designed to manage the flow of power between the fuel cell stack, battery, vehicle load, and balance-of-plant load. It splits the load according to pre-defined energy management rules, which are implemented within the bounds of the battery management system and the fuel cell control unit.</div><div><br></div>This model implements a simple energy management algorithm for a hybrid fuel cell &amp; battery system. The model reads the state-of-charge (SOC) of the battery. If it is less than a lower threshold value, then a signal is sent to activate the fuel cell with a given electric current. The rate at which current can be demanded from the fuel cell is limited by a slew rate.&nbsp;</body></html>"));
end EnergyManagementSystem;
end EnergyManagementSystem;
4 changes: 1 addition & 3 deletions VirtualFCS/Control/PumpSpeedControl.mo
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Expand Up @@ -2,9 +2,7 @@ within VirtualFCS.Control;

block PumpSpeedControl
parameter Real k = 1 "Control Gain";
parameter Real Td = 0.1 "Time Constant of Derivative Block";
//parameter Real k = 1 "Control Gain";
//parameter Real Td = 1 "Time Constant of Derivative Block";
parameter Modelica.Units.SI.Time Td = 0.1 "Time Constant of Derivative Block";
Modelica.Blocks.Continuous.LimPID limPID(Td = Td, initType = Modelica.Blocks.Types.Init.InitialOutput, k = k, yMax = 1, yMin = 0) annotation(
Placement(visible = true, transformation(origin = {-30, 30}, extent = {{-10, -10}, {10, 10}}, rotation = 0)));
Modelica.Blocks.Interfaces.RealInput setMassFlow annotation(
Expand Down
4 changes: 2 additions & 2 deletions VirtualFCS/Control/PumpSpeedControlCooling.mo
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Expand Up @@ -2,8 +2,8 @@ within VirtualFCS.Control;

block PumpSpeedControlCooling
parameter Real k = 1 "Control Gain";
parameter Real Td = 0.1 "Time Constant of Derivative Block";
parameter Real Ti = 0.1 "Time Constant of Integral Block";
parameter Modelica.Units.SI.Time Td = 0.1 "Time Constant of Derivative Block";
parameter Modelica.Units.SI.Time Ti = 0.1 "Time Constant of Integral Block";
Modelica.Blocks.Interfaces.RealInput setMassFlow annotation(
Placement(visible = true, transformation(origin = {-100, 40}, extent = {{-20, -20}, {20, 20}}, rotation = 0), iconTransformation(origin = {-110, 50}, extent = {{-10, -10}, {10, 10}}, rotation = 0)));
Modelica.Blocks.Interfaces.RealInput getMassFlow annotation(
Expand Down
6 changes: 3 additions & 3 deletions VirtualFCS/Control/VoltageLimiter.mo
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@@ -1,8 +1,8 @@
within VirtualFCS.Control;

model VoltageLimiter "Enforce voltage limits on battery cells."
parameter Real upperVoltageLimit(unit = "V") = 3.6 "Upper Voltage Limit";
parameter Real lowerVoltageLimit(unit = "V") = 2.0 "Lower Voltage Limit";
parameter Modelica.Units.SI.Voltage upperVoltageLimit = 3.6 "Upper Voltage Limit";
parameter Modelica.Units.SI.Voltage lowerVoltageLimit = 2.0 "Lower Voltage Limit";
Modelica.Electrical.Analog.Interfaces.PositivePin pin_p_battery annotation(
Placement(visible = true, transformation(origin = {196, 0}, extent = {{10, -10}, {-10, 10}}, rotation = 0), iconTransformation(origin = {110, 190}, extent = {{10, -10}, {-10, 10}}, rotation = 0)));
Modelica.Electrical.Analog.Interfaces.NegativePin pin_n_battery annotation(
Expand Down Expand Up @@ -68,4 +68,4 @@ equation
Icon(graphics = {Rectangle(origin = {-100, 100}, fillColor = {50, 50, 50}, fillPattern = FillPattern.Solid, extent = {{-100, 100}, {300, -300}}), Text(origin = {2, 137}, lineColor = {255, 255, 255}, extent = {{-74, 31}, {74, -31}}, textString = "Battery"), Text(origin = {-4, -101}, lineColor = {255, 255, 255}, extent = {{-74, 31}, {74, -31}}, textString = "Load"), Text(origin = {-7, 253}, lineColor = {0, 0, 255}, extent = {{-181, 45}, {181, -45}}, textString = "%name")}, coordinateSystem(extent = {{-200, -200}, {200, 200}}, initialScale = 0.1)),
Diagram(coordinateSystem(extent = {{-200, -200}, {200, 200}})),
Documentation(info = "<html><head></head><body>The voltage limiter block enforces user-defined upper and lower voltage limits for battery cells and packs.&nbsp;</body></html>"));
end VoltageLimiter;
end VoltageLimiter;
2 changes: 1 addition & 1 deletion VirtualFCS/Electrical/DCConverterSwitch.mo
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Expand Up @@ -101,4 +101,4 @@ The DC/DC converter is characterized by:
where underlined voltages and currents represent complex phasors</li>
</ul>
</html>"));
end DCConverterSwitch;
end DCConverterSwitch;
24 changes: 12 additions & 12 deletions VirtualFCS/Electrochemical/Battery/BatterySystem.mo
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Expand Up @@ -4,19 +4,19 @@ model BatterySystem
// System
outer Modelica.Fluid.System system "System properties";
// Battery Pack Parameters
parameter Real m_bat_pack(unit = "kg") = 100 "Mass of the pack";
parameter Real L_bat_pack(unit = "m") = 0.6 "Battery pack length";
parameter Real W_bat_pack(unit = "m") = 0.45 "Battery pack width";
parameter Real H_bat_pack(unit = "m") = 0.1 "Battery pack height";
parameter Real Cp_bat_pack(unit = "J/(kg.K)") = 1000 "Specific Heat Capacity";
parameter Real V_min_bat_pack(unit = "V") = 240 "Battery pack minimum voltage";
parameter Real V_nom_bat_pack(unit = "V") = 336 "Battery pack nominal voltage";
parameter Real V_max_bat_pack(unit = "V") = 403.2 "Battery pack maximum voltage";
parameter Real C_bat_pack(unit = "A.h") = 200 "Battery pack nominal capacity";
parameter Modelica.Units.SI.Mass m_bat_pack = 100 "Mass of the pack";
parameter Modelica.Units.SI.Length L_bat_pack = 0.6 "Battery pack length";
parameter Modelica.Units.SI.Breadth W_bat_pack = 0.45 "Battery pack width";
parameter Modelica.Units.SI.Height H_bat_pack = 0.1 "Battery pack height";
parameter Modelica.Units.SI.SpecificHeatCapacity Cp_bat_pack = 1000 "Specific Heat Capacity";
parameter Modelica.Units.SI.Voltage V_min_bat_pack = 240 "Battery pack minimum voltage";
parameter Modelica.Units.SI.Voltage V_nom_bat_pack = 336 "Battery pack nominal voltage";
parameter Modelica.Units.SI.Voltage V_max_bat_pack = 403.2 "Battery pack maximum voltage";
parameter Modelica.Units.NonSI.ElectricCharge_Ah C_bat_pack = 200 "Battery pack nominal capacity";
parameter Real SOC_init = 0.5 "Battery pack initial state of charge";
// Power & efficiencies
Real Power(unit = "W") "Battery delivered power";
Real eta_batt(unit = "100") "Battery efficiency, calculated by assuming loss in terms of heat";
Modelica.Units.SI.Power Power "Battery delivered power";
Modelica.Units.SI.Efficiency eta_batt "Battery efficiency, calculated by assuming loss in terms of heat";
VirtualFCS.Control.BatteryManagementSystem batteryManagementSystem(N_s = batteryPack.N_s) annotation(
Placement(visible = true, transformation(origin = {0, 30}, extent = {{-30, -20}, {30, 20}}, rotation = 0)));
Modelica.Electrical.Analog.Interfaces.PositivePin pin_p annotation(
Expand All @@ -35,7 +35,7 @@ model BatterySystem
Placement(visible = true, transformation(origin = {0.369106, -30.5794}, extent = {{-24.8691, -14.9215}, {24.8691, 16.5794}}, rotation = 0)));
equation
Power = pin_n.i*pin_p.v;
eta_batt = max((abs(Power)-(batteryPack.heatSource.Q_flow))/(max(abs(Power), 0.00001)) * 100, 90);
eta_batt = max((abs(Power)-(batteryPack.heatSource.Q_flow))/(max(abs(Power), 0.00001)), 0.9);
connect(pin_n, batteryManagementSystem.pin_n_load) annotation(
Line(points = {{-44, 96}, {-44, 96}, {-44, 80}, {-10, 80}, {-10, 48}, {-10, 48}}, color = {0, 0, 255}));
connect(pin_p, batteryManagementSystem.pin_p_load) annotation(
Expand Down
8 changes: 4 additions & 4 deletions VirtualFCS/Electrochemical/Battery/LiIonBatteryPack_Composite.mo
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Expand Up @@ -6,9 +6,9 @@ model LiIonBatteryPack_Composite "A Li-ion battery pack comprised of individual
parameter Real SOC_init(unit = "1") = 0.5 "Initial State of Charge";
parameter Integer p = 5 "Number of Cells in Parallel";
parameter Integer s = 10 "Number of Cells in Series";
parameter Real coolingArea = p * s * liIonCell[1].coolingArea "Cooling Area";
parameter Real heatTransferCoefficient(unit = "W/(m2.K)") = 7.8 * 10 ^ 0.78;
Real chargeCapacity;
parameter Modelica.Units.SI.Area coolingArea = p * s * liIonCell[1].coolingArea "Cooling Area";
parameter Modelica.Units.SI.CoefficientOfHeatTransfer heatTransferCoefficient = 7.8 * 10 ^ 0.78 "HeatTransferCoefficient (W/(m2.K))";
Modelica.Units.NonSI.ElectricCharge_Ah chargeCapacity;
VirtualFCS.Electrochemical.Battery.LiIonCell liIonCell[s * p](each SOC_init = SOC_init) annotation(
Placement(visible = true, transformation(origin = {0, 50.3333}, extent = {{-37, -24.6667}, {37, 24.6667}}, rotation = 0)));
Modelica.Electrical.Analog.Interfaces.PositivePin pin_p annotation(
Expand Down Expand Up @@ -95,4 +95,4 @@ This class automatically generates instances of the LiIonCell model based on the
</tr>
</tbody></table><br>
</div><div><div><i><u>Convective Heat Transfer</u></i></div><div>Q<sub>conv</sub>&nbsp;= hA<sub>cool</sub>(T&nbsp;<span style=\"color: rgb(32, 33, 34); font-family: sans-serif; orphans: 2; widows: 2; background-color: rgb(253, 253, 253);\">−</span>&nbsp;T<sub>0</sub>)</div><div><br></div><div><div><i><u>Radiative Heat Transfer</u></i></div><div>Q<sub>rad</sub>&nbsp;= 0.95A<sub>cool</sub><span style=\"color: rgb(32, 33, 34); font-family: sans-serif; orphans: 2; widows: 2; background-color: rgb(255, 255, 255);\">σ</span>(T<sup>4</sup>&nbsp;<span style=\"color: rgb(32, 33, 34); font-family: sans-serif; orphans: 2; widows: 2; background-color: rgb(253, 253, 253);\">−</span>&nbsp;(T<sub>0</sub>)<sup>4</sup>)</div></div></div></body></html>"));
end LiIonBatteryPack_Composite;
end LiIonBatteryPack_Composite;
36 changes: 18 additions & 18 deletions VirtualFCS/Electrochemical/Battery/LiIonBatteryPack_Lumped.mo
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Expand Up @@ -3,23 +3,23 @@ within VirtualFCS.Electrochemical.Battery;
model LiIonBatteryPack_Lumped "A Li-ion battery pack model comprising a single lumped battery model."
// DECLARE PARAMETERS //
// Pack-level parameters
parameter Real m_bat_pack(unit = "kg") = 100 "Mass of the pack";
parameter Real L_bat_pack(unit = "m") = 0.6 "Battery pack length";
parameter Real W_bat_pack(unit = "m") = 0.45 "Battery pack width";
parameter Real H_bat_pack(unit = "m") = 0.1 "Battery pack height";
parameter Real Cp_bat_pack(unit = "J/(kg.K)") = 1000 "Specific Heat Capacity";
parameter Real V_min_bat_pack(unit = "V") = 37.5 "Battery pack minimum voltage";
parameter Real V_nom_bat_pack(unit = "V") = 48 "Battery pack nominal voltage";
parameter Real V_max_bat_pack(unit = "V") = 54.75 "Battery pack maximum voltage";
parameter Real C_bat_pack(unit = "A.h") = 200 "Battery pack nominal capacity";
parameter Modelica.Units.SI.Mass m_bat_pack = 100 "Mass of the pack";
parameter Modelica.Units.SI.Length L_bat_pack = 0.6 "Battery pack length";
parameter Modelica.Units.SI.Breadth W_bat_pack = 0.45 "Battery pack width";
parameter Modelica.Units.SI.Height H_bat_pack = 0.1 "Battery pack height";
parameter Modelica.Units.SI.SpecificHeatCapacity Cp_bat_pack = 1000 "Specific Heat Capacity";
parameter Modelica.Units.SI.Voltage V_min_bat_pack = 37.5 "Battery pack minimum voltage";
parameter Modelica.Units.SI.Voltage V_nom_bat_pack = 48 "Battery pack nominal voltage";
parameter Modelica.Units.SI.Voltage V_max_bat_pack = 54.75 "Battery pack maximum voltage";
parameter Modelica.Units.NonSI.ElectricCharge_Ah C_bat_pack = 200 "Battery pack nominal capacity";
parameter Real SOC_init = 0.5 "Battery pack initial state of charge";
parameter Real heatTransferCoefficient(unit = "W/(m2.K)") = 7.8 * 10 ^ 0.78;
parameter Modelica.Units.SI.CoefficientOfHeatTransfer heatTransferCoefficient = 7.8 * 10 ^ 0.78 "HeatTransferCoefficient (W/(m2.K))";
parameter Real N_s = ceil(V_max_bat_pack / V_chem_max);
Real vol_bat_pack = L_bat_pack * W_bat_pack * H_bat_pack;
Modelica.Units.SI.Volume vol_bat_pack = L_bat_pack * W_bat_pack * H_bat_pack;
// ADD dropdown menu for selecting chemistry type
// Coefficients for open-circuit voltage calculation
// LFP
parameter Real V_chem_max = 3.65;
parameter Modelica.Units.SI.Voltage V_chem_max = 3.65;
Real a1 = 3.25;
Real b1 = -1e-4;
Real c1 = -0.08;
Expand Down Expand Up @@ -70,12 +70,12 @@ model LiIonBatteryPack_Lumped "A Li-ion battery pack model comprising a single l
Modelica.Thermal.HeatTransfer.Components.BodyRadiation bodyRadiation(Gr = 0.95 * A_cool_bat_pack) annotation(
Placement(visible = true, transformation(origin = {-90, -50}, extent = {{-10, -10}, {10, 10}}, rotation = -90)));
protected
parameter Real R_O(unit = "Ohm") = 0.02 "Ohmic Resistance";
parameter Real R1_0(unit = "Ohm") = 0.01 "First RC Resistance";
parameter Real R2_0(unit = "Ohm") = 0.005 "Second RC Resistance";
parameter Real C1_0(unit = "F") = 5000 "First RC Capacitance";
parameter Real C2_0(unit = "F") = 20000 "Second RC Capacitance";
parameter Real A_cool_bat_pack = L_bat_pack * W_bat_pack;
parameter Modelica.Units.SI.Resistance R_O = 0.02 "Ohmic Resistance";
parameter Modelica.Units.SI.Resistance R1_0 = 0.01 "First RC Resistance";
parameter Modelica.Units.SI.Resistance R2_0 = 0.005 "Second RC Resistance";
parameter Modelica.Units.SI.Capacitance C1_0 = 5000 "First RC Capacitance";
parameter Modelica.Units.SI.Capacitance C2_0 = 20000 "Second RC Capacitance";
parameter Modelica.Units.SI.Area A_cool_bat_pack = L_bat_pack * W_bat_pack;
equation
// ***DEFINE EQUATIONS ***//
// Calculate the open-circuit voltage at given temperature and state of charge
Expand Down
19 changes: 9 additions & 10 deletions VirtualFCS/Electrochemical/Battery/LiIonCell.mo
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Expand Up @@ -3,18 +3,17 @@ within VirtualFCS.Electrochemical.Battery;
model LiIonCell "An equivalent circuit model for a Li-ion battery cell."
// DECLARE PARAMETERS //
// Physical parameters
parameter Real mass(unit = "kg") = 0.045 "Mass of the pack";
parameter Real coolingArea(unit = "m2") = 0.003675 "Surface area for cooling";
// parameter Real vol(unit = "L") = 0.016 "Volume of the pack";
parameter Real specificHeatCapacity(unit = "J/(kg.K)") = 1000 "Specific Heat Capacity";
parameter Modelica.Units.SI.Mass mass = 0.045 "Mass of the cell";
parameter Modelica.Units.SI.Area coolingArea = 0.003675 "Surface area for cooling";
parameter Modelica.Units.SI.SpecificHeatCapacity specificHeatCapacity = 1000 "Specific Heat Capacity";
// Pack design parameters
parameter Real SOC_init(unit = "1") = 0.5 "Initial State of Charge";
parameter Real chargeCapacity(unit = "Ah") = 2.2 "Battery Cell Capacity";
parameter Real R_O(unit = "Ohm") = 0.02 "Ohmic Resistance";
parameter Real R1_0(unit = "Ohm") = 0.01 "First RC Resistance";
parameter Real R2_0(unit = "Ohm") = 0.005 "Second RC Resistance";
parameter Real C1_0(unit = "F") = 5000 "First RC Capacitance";
parameter Real C2_0(unit = "F") = 20000 "Second RC Capacitance";
parameter Modelica.Units.NonSI.ElectricCharge_Ah chargeCapacity = 2.2 "Battery Cell Capacity";
parameter Modelica.Units.SI.Resistance R_O = 0.02 "Ohmic Resistance";
parameter Modelica.Units.SI.Resistance R1_0 = 0.01 "First RC Resistance";
parameter Modelica.Units.SI.Resistance R2_0 = 0.005 "Second RC Resistance";
parameter Modelica.Units.SI.Capacitance C1_0 = 5000 "First RC Capacitance";
parameter Modelica.Units.SI.Capacitance C2_0 = 20000 "Second RC Capacitance";
// DECLARE VARIABLES //
// Coefficients for open-circuit voltage calculation
// LFP
Expand Down
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