model Resistor "Single phase linear resistor"
import Modelica.ComplexMath.real;
import Modelica.ComplexMath.conj;
extends Interfaces.OnePort;
parameter Modelica.SIunits.Resistance R_ref(start = 1) "Reference resistance at T_ref";
parameter Modelica.SIunits.Temperature T_ref = 293.15 "Reference temperature";
parameter Modelica.SIunits.LinearTemperatureCoefficient alpha_ref = 0 "Temperature coefficient of resistance (R_actual = R_ref*(1 + alpha_ref*(heatPort.T - T_ref))";
extends Modelica.Electrical.Analog.Interfaces.ConditionalHeatPort(T = T_ref);
Modelica.SIunits.Resistance R_actual "Resistance = R_ref*(1 + alpha_ref*(heatPort.T - T_ref))";
equation
assert(Modelica.Constants.eps <= 1 + alpha_ref * (T_heatPort - T_ref), "Temperature outside scope of model!");
v = R_actual * i;
LossPower = real(v * conj(i));
R_actual = R_ref * (1 + alpha_ref * (T_heatPort - T_ref));
annotation (
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Documentation(info = "<html>\n<p>\nThe linear resistor connects the complex voltage <code><u>v</u></code> with the complex\ncurrent <code><u>i</u></code> by <code><u>i</u>*R = <u>v</u></code>.\nThe resistance <code>R</code> is allowed to be positive, zero, or negative.\n</p>\n\n<p>\nThe resistor model also has an optional\n<a href=\"modelica://Modelica.Electrical.Analog.Interfaces.ConditionalHeatPort\">conditional heat port</a>.\nA linear temperature dependency of the resistance is also taken into account.\n</p>\n\n<h4>See also</h4>\n<p>\n<a href=\"modelica://Modelica.Electrical.QuasiStationary.SinglePhase.Basic.Conductor\">Conductor</a>,\n<a href=\"modelica://Modelica.Electrical.QuasiStationary.SinglePhase.Basic.Capacitor\">Capacitor</a>,\n<a href=\"modelica://Modelica.Electrical.QuasiStationary.SinglePhase.Basic.Inductor\">Inductor</a>,\n<a href=\"modelica://Modelica.Electrical.QuasiStationary.SinglePhase.Basic.Impedance\">Impedance</a>,\n<a href=\"modelica://Modelica.Electrical.QuasiStationary.SinglePhase.Basic.Admittance\">Admittance</a>,\n<a href=\"modelica://Modelica.Electrical.QuasiStationary.SinglePhase.Basic.VariableResistor\">Variable resistor</a>,\n<a href=\"modelica://Modelica.Electrical.QuasiStationary.SinglePhase.Basic.VariableConductor\">Variable conductor</a>,\n<a href=\"modelica://Modelica.Electrical.QuasiStationary.SinglePhase.Basic.VariableCapacitor\">Variable capacitor</a>,\n<a href=\"modelica://Modelica.Electrical.QuasiStationary.SinglePhase.Basic.VariableInductor\">Variable inductor</a>,\n<a href=\"modelica://Modelica.Electrical.QuasiStationary.SinglePhase.Basic.VariableImpedance\">Variable impedance</a>,\n<a href=\"modelica://Modelica.Electrical.QuasiStationary.SinglePhase.Basic.VariableAdmittance\">Variable admittance</a>\n</p>\n</html>"));
end Resistor;