在Modelica中构建简单DCDC转换器的问题
我想为DCDC转换器编写一个非常简单的模型。出于某种原因，Dymola告诉我，＆＃34;模型并不适合＃34;并且超过了Real元素。
这可能是一个非常简单的问题，但我无法看到它！
这是我的代码：
model DCDC
extends Modelica.Electrical.Analog.Interfaces.TwoPort;
parameter Real demandedVoltage;
Modelica.Electrical.Analog.Sensors.VoltageSensor sekVolt annotation (
Placement(transformation(
extent={{-10,-10},{10,10}},
rotation=270,
origin={80,0})));
Modelica.Electrical.Analog.Sensors.CurrentSensor currentSensor annotation (
Placement(transformation(
extent={{-10,10},{10,-10}},
rotation=270,
origin={-50,-30})));
Modelica.Electrical.Analog.Sources.SignalCurrent signalCurrent annotation (
Placement(transformation(
extent={{-10,-10},{10,10}},
rotation=270,
origin={-50,30})));
Modelica.Electrical.Analog.Sources.ConstantVoltage constantVoltage(V=
vehicleVoltage)
annotation (Placement(transformation(
extent={{-10,10},{10,-10}},
rotation=270,
origin={50,30})));
Modelica.Electrical.Analog.Sensors.CurrentSensor currentSensor1 annotation (
Placement(transformation(
extent={{-10,-10},{10,10}},
rotation=270,
origin={50,-30})));
Modelica.Blocks.Math.Division division
annotation (Placement(transformation(extent={{6,22},{-10,38}})));
Modelica.Blocks.Math.Product product
annotation (Placement(transformation(extent={{8,-8},{-8,8}},
rotation=270,
origin={30,8})));
Modelica.Blocks.Math.Gain gain(k=-1)
annotation (Placement(transformation(extent={{-20,22},{-36,38}})));
Modelica.Electrical.Analog.Sensors.VoltageSensor primVolt
annotation (
Placement(transformation(
extent={{-10,10},{10,-10}},
rotation=270,
origin={-80,0})));
equation
connect(currentSensor.p, signalCurrent.n) annotation (Line(
points={{-50,-20},{-50,20}},
color={0,0,255},
smooth=Smooth.None));
connect(constantVoltage.n, currentSensor1.p) annotation (Line(
points={{50,20},{50,-20}},
color={0,0,255},
smooth=Smooth.None));
connect(signalCurrent.p, p1) annotation (Line(
points={{-50,40},{-50,50},{-100,50}},
color={0,0,255},
smooth=Smooth.None));
connect(currentSensor.n, n1) annotation (Line(
points={{-50,-40},{-50,-50},{-100,-50}},
color={0,0,255},
smooth=Smooth.None));
connect(constantVoltage.p, p2) annotation (Line(
points={{50,40},{50,50},{100,50}},
color={0,0,255},
smooth=Smooth.None));
connect(currentSensor1.n, n2) annotation (Line(
points={{50,-40},{50,-50},{100,-50}},
color={0,0,255},
smooth=Smooth.None));
connect(primVolt.n, n1) annotation (Line(
points={{-80,-10},{-80,-50},{-100,-50}},
color={0,0,255},
smooth=Smooth.None));
connect(primVolt.p, p1) annotation (Line(
points={{-80,10},{-80,50},{-100,50}},
color={0,0,255},
smooth=Smooth.None));
connect(sekVolt.p, p2) annotation (Line(
points={{80,10},{80,50},{100,50}},
color={0,0,255},
smooth=Smooth.None));
connect(sekVolt.n, n2) annotation (Line(
points={{80,-10},{80,-50},{100,-50}},
color={0,0,255},
smooth=Smooth.None));
connect(gain.y, signalCurrent.i) annotation (Line(
points={{-36.8,30},{-43,30}},
color={0,0,127},
smooth=Smooth.None));
connect(division.y, gain.u) annotation (Line(
points={{-10.8,30},{-18.4,30}},
color={0,0,127},
smooth=Smooth.None));
connect(currentSensor1.i, product.u2) annotation (Line(
points={{40,-30},{25.2,-30},{25.2,-1.6}},
color={0,0,127},
smooth=Smooth.None));
connect(sekVolt.v, product.u1) annotation (Line(
points={{70,0},{62,0},{62,-10},{34.8,-10},{34.8,-1.6}},
color={0,0,127},
smooth=Smooth.None));
connect(product.y, division.u1) annotation (Line(
points={{30,16.8},{30,34.8},{7.6,34.8}},
color={0,0,127},
smooth=Smooth.None));
connect(primVolt.v, division.u2) annotation (Line(
points={{-70,0},{14,0},{14,20},{14,20},{14,25.2},{7.6,25.2}},
color={0,0,127},
smooth=Smooth.None));
annotation (
Diagram(coordinateSystem(preserveAspectRatio=false, extent={{-100,-100},{100,
100}}), graphics), Icon(coordinateSystem(preserveAspectRatio=false,
extent={{-100,-100},{100,100}}), graphics={
Rectangle(
extent={{-100,100},{100,-100}},
lineColor={0,0,127},
lineThickness=0.5,
fillPattern=FillPattern.Solid,
fillColor={215,215,215}),
Line(
points={{-100,100}},
color={0,0,255},
smooth=Smooth.None),
Line(
points={{-100,100},{-100,-100},{100,-100},{100,100},{-100,100}},
color={0,0,127},
thickness=0.5,
smooth=Smooth.None),
Line(
points={{-100,-100},{100,100}},
color={0,0,127},
thickness=0.5,
smooth=Smooth.None),
Text(
extent={{-60,80},{0,20}},
lineColor={0,0,0},
lineThickness=0.5,
textString="DC"),
Text(
extent={{0,-20},{60,-80}},
lineColor={0,0,0},
lineThickness=0.5,
textString="DC")}));
end DCDC;
希望有人可以在这里找出我的问题。 提前谢谢！
编辑： 在答案之后我决定改变我的模型，因为我需要用于混合（能量/功率）电源的转换器。生成的转换器在以下代码中给出：
model DCDC2 "Component with two electrical ports, including current"
Real v_energy "Voltage drop over the energy port";
Real v_power "Voltage drop over the power port";
Real v_output "Voltage drop over the output port";
Real i_energy "Current flowing from pos. to neg. pin of the energy port";
Real i_power "Current flowing from pos. to neg. pin of the power port";
Real i_output "Current flowing from pos. to neg. pin of the output port";
Real p_energy;
Real p_power;
Real p_output;
parameter Real demandedVoltage;
parameter Real efficiency = 1;
Modelica.Electrical.Analog.Interfaces.PositivePin pinP_Energy
annotation (Placement(transformation(extent={{-110,50},{-90,70}})));
Modelica.Electrical.Analog.Interfaces.NegativePin pinN_Energy
annotation (Placement(transformation(extent={{-110,-70},{-90,-50}})));
Modelica.Electrical.Analog.Interfaces.PositivePin pinP_Power
annotation (Placement(transformation(extent={{90,50},{110,70}})));
Modelica.Electrical.Analog.Interfaces.NegativePin pinN_Power
annotation (Placement(transformation(extent={{90,-70},{110,-50}})));
Modelica.Electrical.Analog.Interfaces.PositivePin pinP_Output
annotation (Placement(transformation(extent={{-20,80},{20,120}})));
Modelica.Electrical.Analog.Interfaces.NegativePin pinN_Output
annotation (Placement(transformation(extent={{-20,-120},{20,-80}})));
equation
v_energy = pinP_Energy.v - pinN_Energy.v;
v_power = pinP_Power.v - pinN_Power.v;
v_output = pinP_Output.v - pinN_Output.v;
0 = pinP_Energy.i + pinN_Energy.i;
0 = pinP_Power.i + pinN_Power.i;
0 = pinP_Output.i + pinN_Output.i;
i_energy = pinP_Energy.i;
i_power = pinP_Power.i;
i_output = pinP_Output.i;
p_energy = v_energy * i_energy;
p_power = v_power * i_power;
p_output = v_output * i_output;
p_output = efficiency*(p_energy + p_power);
i_output = i_energy + i_power;
v_output = demandedVoltage;
annotation (
Diagram(coordinateSystem(preserveAspectRatio=false, extent={{-100,- 100},{100,
100}}), graphics), Icon(coordinateSystem(preserveAspectRatio=false,
extent={{-100,-100},{100,100}}), graphics={
Rectangle(
extent={{-100,100},{100,-100}},
lineColor={0,0,127},
lineThickness=0.5,
fillPattern=FillPattern.Solid,
fillColor={215,215,215}),
Line(
points={{-100,100}},
color={0,0,255},
smooth=Smooth.None),
Line(
points={{-100,100},{-100,-100},{100,-100},{100,100},{-100,100}},
color={0,0,127},
thickness=0.5,
smooth=Smooth.None),
Text(
extent={{-68,60},{70,-66}},
lineColor={0,0,0},
textString="Hybrid
DC
Converter")}));
end DCDC2;
如果我使用两个简单的恒流源和一个恒定电流负载测试转换器，我会再次出现奇点误差。 Dymola 2015告诉我，可能存在一个不可确定的基础，但事实并非如此。
model test2
Modelica_EnergyStorages.Sources.Loads.BooleanConstantCurrent
booleanConstantCurrent(I=40)
annotation (Placement(transformation(extent={{46,0},{26,20}})));
Modelica.Electrical.Analog.Basic.Ground ground
annotation (Placement(transformation(extent={{-84,-40},{-64,-20}})));
Modelica.Blocks.Sources.BooleanConstant booleanConstant
annotation (Placement(transformation(extent={{66,0},{46,20}})));
Modelica.Electrical.Analog.Basic.Ground ground1
annotation (Placement(transformation(extent={{26,-86},{46,-66}})));
ElectricalEnergyStorageSystem.Components.DCDC2 dCDC2_1(efficiency=1,
demandedVoltage=15)
annotation (Placement(transformation(extent={{-44,0},{-24,20}})));
Modelica.Electrical.Analog.Sources.ConstantCurrent constantCurrent(I=5)
annotation (Placement(transformation(
extent={{-10,-10},{10,10}},
rotation=270,
origin={-74,10})));
Modelica.Electrical.Analog.Sources.ConstantCurrent constantCurrent1(I=15)
annotation (Placement(transformation(
extent={{-10,-10},{10,10}},
rotation=270,
origin={6,10})));
Modelica.Electrical.Analog.Basic.Ground ground2
annotation (Placement(transformation(extent={{-4,-40},{16,-20}})));
equation
connect(booleanConstantCurrent.on, booleanConstant.y) annotation (Line(
points={{45,10},{45,10}},
color={255,0,255},
smooth=Smooth.None));
connect(booleanConstantCurrent.pin_n, ground1.p) annotation (Line(
points={{36,0},{36,-66}},
color={0,0,255},
smooth=Smooth.None));
connect(dCDC2_1.pinP_Output, booleanConstantCurrent.pin_p) annotation (Line(
points={{-34,20},{-34,76},{36,76},{36,20}},
color={0,0,255},
smooth=Smooth.None));
connect(booleanConstantCurrent.pin_n, dCDC2_1.pinN_Output) annotation (Line(
points={{36,0},{36,-54},{-34,-54},{-34,0}},
color={0,0,255},
smooth=Smooth.None));
connect(constantCurrent1.p, dCDC2_1.pinP_Power) annotation (Line(
points={{6,20},{-24,20},{-24,16}},
color={0,0,255},
smooth=Smooth.None));
connect(constantCurrent1.n, dCDC2_1.pinN_Power) annotation (Line(
points={{6,0},{-24,0},{-24,4}},
color={0,0,255},
smooth=Smooth.None));
connect(constantCurrent.p, dCDC2_1.pinP_Energy) annotation (Line(
points={{-74,20},{-44,20},{-44,16}},
color={0,0,255},
smooth=Smooth.None));
connect(constantCurrent.n, dCDC2_1.pinN_Energy) annotation (Line(
points={{-74,0},{-44,0},{-44,4}},
color={0,0,255},
smooth=Smooth.None));
connect(constantCurrent1.n, ground2.p) annotation (Line(
points={{6,0},{6,-20}},
color={0,0,255},
smooth=Smooth.None));
connect(ground.p, constantCurrent.n) annotation (Line(
points={{-74,-20},{-74,0}},
color={0,0,255},
smooth=Smooth.None));
annotation (uses(
Modelica_EnergyStorages(version="3.2.1"),
Modelica(version="3.2.1"),
Buildings(version="2.0.0")), Diagram(coordinateSystem(preserveAspectRatio
=false, extent={{-100,-100},{100,100}}), graphics));
end test2;
代码导致以下模型。 （恒定当前负载来自Modelica_EnergyStorages库）
希望你能以某种方式帮助我解决这个问题！提前谢谢！
1 个答案:
答案 0 :(得分：3)
唯一的小问题是您已声明demandedVoltage但使用vehicleVoltage。您的模型没有其他任何问题。
注意：最好在问题中包含一个最小的顶级模型进行测试。
我在顶级模型TestDCDC中测试了您的模型，并在SimulationX 3.6.5中测试了电容作为电源和电阻作为负载。
下图显示了测试模型的原理图。
使用SimulationX获得的结果如下图所示。
我还检查了SimulationX生成的方程系统。它看起来很好。
Dymola 2015会生成错误的错误消息，指出除了方程式之外还有两个变量。您应该向Dymola的制作人发布此模型的错误报告。请注意，Modelica模型的符号分析非常复杂，可能会出现类似问题。通常，该工具的维护者对此案例中的错误报告表示感谢。
讨论解决方案：
DCDC转换器需要来自电容器的恒定功率P=100W，并且电容器的初始电压为capacitor1.v.start=10 V。
这给出了能量时间信号
W = C/2*(v.start)^2-P*time = 50Ws - 100W*time
并且电容器电压信号导致
capacitor1.v = 2*sqrt(W)/C = 2V/As * sqrt(50Ws-100Ws*time)
在time = 0.5s，电容器为空，电流发散。
SimulationX在时间= 0.5时正确停止并显示错误消息。
复制结果的完整模型：
model TestDCDC
model DCDC
extends Modelica.Electrical.Analog.Interfaces.TwoPort;
parameter Real demandedVoltage;
Modelica.Electrical.Analog.Sensors.VoltageSensor sekVolt annotation(Placement(transformation(
origin={80,0},
extent={{-10,-10},{10,10}},
rotation=270)));
Modelica.Electrical.Analog.Sensors.CurrentSensor currentSensor annotation(Placement(transformation(
origin={-50,-30},
extent={{-10,10},{10,-10}},
rotation=270)));
Modelica.Electrical.Analog.Sources.SignalCurrent signalCurrent annotation(Placement(transformation(
origin={-50,30},
extent={{-10,-10},{10,10}},
rotation=270)));
Modelica.Electrical.Analog.Sources.ConstantVoltage constantVoltage(V=demandedVoltage) annotation(Placement(transformation(
origin={50,30},
extent={{-10,10},{10,-10}},
rotation=270)));
Modelica.Electrical.Analog.Sensors.CurrentSensor currentSensor1 annotation(Placement(transformation(
origin={50,-30},
extent={{-10,-10},{10,10}},
rotation=270)));
Modelica.Blocks.Math.Division division annotation(Placement(transformation(extent={{6,22},{-10,38}})));
Modelica.Blocks.Math.Product product annotation(Placement(transformation(
origin={30,8},
extent={{8,-8},{-8,8}},
rotation=270)));
Modelica.Blocks.Math.Gain gain(k=-1) annotation(Placement(transformation(extent={{-20,22},{-36,38}})));
Modelica.Electrical.Analog.Sensors.VoltageSensor primVolt annotation(Placement(transformation(
origin={-80,0},
extent={{-10,10},{10,-10}},
rotation=270)));
equation
connect(currentSensor.p,signalCurrent.n) annotation(Line(points={{-50,-20},{-50,-15},{-50,15},{-50,20}}));
connect(constantVoltage.n,currentSensor1.p) annotation(Line(points={{50,20},{50,15},{50,-15},{50,-20}}));
connect(signalCurrent.p,p1) annotation(Line(points={{-50,40},{-50,45},{-50,50},{-95,50},{-100,50}}));
connect(currentSensor.n,n1) annotation(Line(points={{-50,-40},{-50,-45},{-50,-50},{-95,-50},{-100,-50}}));
connect(constantVoltage.p,p2) annotation(Line(points={{50,40},{50,45},{50,50},{95,50},{100,50}}));
connect(currentSensor1.n,n2) annotation(Line(points={{50,-40},{50,-45},{50,-50},{95,-50},{100,-50}}));
connect(primVolt.n,n1) annotation(Line(points={{-80,-10},{-80,-15},{-80,-50},{-95,-50},{-100,-50}}));
connect(primVolt.p,p1) annotation(Line(points={{-80,10},{-80,15},{-80,50},{-95,50},{-100,50}}));
connect(sekVolt.p,p2) annotation(Line(points={{80,10},{80,15},{80,50},{95,50},{100,50}}));
connect(sekVolt.n,n2) annotation(Line(points={{80,-10},{80,-15},{80,-50},{95,-50},{100,-50}}));
connect(gain.y,signalCurrent.i) annotation(Line(
points={{-36.7,30},{-41.7,30},{-38,30},{-43,30}},
color={0,0,127}));
connect(division.y,gain.u) annotation(Line(
points={{-10.7,30},{-15.7,30},{-13.3,30},{-18.3,30}},
color={0,0,127}));
connect(currentSensor1.i,product.u2) annotation(Line(
points={{40,-30},{35,-30},{25.3,-30},{25.3,-6.7},{25.3,-1.7}},
color={0,0,127}));
connect(sekVolt.v,product.u1) annotation(Line(
points={{70,0},{65,0},{65,-6.7},{34.7,-6.7},{34.7,-1.7}},
color={0,0,127}));
connect(product.y,division.u1) annotation(Line(
points={{30,16.7},{30,21.7},{30,34.7},{12.7,34.7},{7.7,34.7}},
color={0,0,127}));
connect(primVolt.v,division.u2) annotation(Line(
points={{-70,0},{-65,0},{12.7,0},{12.7,25.3},{7.7,25.3}},
color={0,0,127}));
annotation(
Icon(
coordinateSystem(preserveAspectRatio=false),
graphics={
Rectangle(
lineColor={0,0,127},
fillColor={215,215,215},
fillPattern=FillPattern.Solid,
lineThickness=0.5,
extent={{-100,100},{100,-100}}),
Line(
points={{-100,100}}),
Line(
points={{-100,100},{-100,-100},{100,-100},{100,100},{-100,100}},
color={0,0,127},
thickness=0.5),
Line(
points={{-100,-100},{100,100}},
color={0,0,127},
thickness=0.5),
Text(
textString="DC",
lineThickness=0.5,
extent={{-60,80},{0,20}}),
Text(
textString="DC",
lineThickness=0.5,
extent={{0,-20},{60,-80}})}),
Diagram(coordinateSystem(preserveAspectRatio=false)));
end DCDC;
DCDC dcdc(demandedVoltage=10) annotation(Placement(transformation(extent={{-30,30},{-10,50}})));
Modelica.Electrical.Analog.Basic.Ground ground1 annotation(Placement(transformation(extent={{-85,-5},{-65,15}})));
Modelica.Electrical.Analog.Basic.Resistor resistor1(R=2) annotation(Placement(transformation(
origin={35,40},
extent={{-10,-10},{10,10}},
rotation=-90)));
Modelica.Electrical.Analog.Basic.Ground ground2 annotation(Placement(transformation(extent={{0,-5},{20,15}})));
Modelica.Electrical.Analog.Basic.Capacitor capacitor1(
v(
start=10,
fixed=true),
C=1) annotation(Placement(transformation(
origin={-75,40},
extent={{-10,-10},{10,10}},
rotation=-90)));
equation
connect(resistor1.p,dcdc.p2) annotation(Line(
points={{35,50},{35,55},{15,55},{15,45},{-5,45},{-10,
45}},
thickness=0.0625));
connect(resistor1.n,dcdc.n2) annotation(Line(
points={{35,30},{35,25},{15,25},{15,35},{-5,35},{-10,
35}},
thickness=0.0625));
connect(ground2.p,dcdc.n2) annotation(Line(
points={{10,15},{10,20},{10,35},{-5,35},{-10,35}},
thickness=0.0625));
connect(dcdc.p1,capacitor1.p) annotation(Line(
points={{-30,45},{-35,45},{-35,55},{-75,55},{-75,50}},
thickness=0.0625));
connect(dcdc.n1,capacitor1.n) annotation(Line(
points={{-30,35},{-35,35},{-35,25},{-75,25},{-75,30}},
thickness=0.0625));
connect(ground1.p,capacitor1.n) annotation(Line(
points={{-75,15},{-75,20},{-75,25},{-75,30}},
thickness=0.0625));
end TestDCDC;
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