Description
The fuel cell model in Figure 1 consists of a voltage source connected to a series resistance and a diode to avoid negative current flowing to the cell. The model assumes the operation of the fuel cell at nominal temperature and pressure.
Figure 1 Fuel 1 Fuel Cell equivalent circuit diagram
The fuel cell model described in Figure 1 represents the following transfer function
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\frac{1}{s \frac{t a u}{3}+1} * N A \ln \left(\frac{i_{f c}}{i_{0}}\right) |
Where:
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N A=\frac{\left(V_{1}-V n o m\right)\left(I_{\max }-1\right)-\left(V_{1}-V_{\min }\right)\left(I_{\ln m}-1\right)}{\ln \left(I_{\text {nom}}\right)\left(I_{\max }-1\right)-\ln \left(I_{\max }\right)\left(I_{\text { nom }}-1\right)} |
The mentioned parameters are described in Fuel Cell (FC)#Mask Mask and Parameters section below.
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Mask and Parameters
Fuel Cell Parameters
Name | Description | Unit |
|---|---|---|
Eoc | Open circuit voltage | V |
V_1 | Voltage at 1 Ampere | V |
Vnom | Nominal voltage | V |
Inom | Nominal current | A |
Vmin | Minimum voltage | V |
Imax | Maximum available current | A |
tau | Response time | s |
Stack Voltage vs Current
Figure 2 Fuel Cell stack voltage vs current diagram
Ports, Inputs, Outputs and Signals Available for Monitoring
Ports
Name | Description |
|---|---|
Net_1 | Network connection; the "+" indicates the current measurement direction (supports only 1-phase connections) |
Net_2 | Network connection (supports only 1-phase connections) |
Inputs
None
Outputs
None
Sensors
Name | Description | Units |
|---|---|---|
Voltage | DC output voltage produced by the Fuel Cell | pu |
Current | DC output current produced by the Fuel Cell | pu |
Extraction of Data Examples
The parameters for the Fuel Cell can be directly obtained from the datasheet on the stack voltage vs current curve shown as shown in the example in Figure 2. Some examples on of this process are shown below. It is recommended to use a software that allows a precise extraction of data on the figures.
PowerCell S2-50C Fuel Cell
Figure 3
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Figure 3 Stack voltage vs current S2-50C.
Name | Value extracted from Figure |
|---|---|
Eoc (V) | 47.1175 |
V_1 (V) | 46.2974 |
Vnom (V) | 32.5 |
Inom (A) | 144.2 |
Vmin (V) | 30 |
Imax (A) | 200 |
NedStack PS6
Figure 4 Stack voltage vs current PS6.
Figure 4
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NedStack PS6. Available on http://www.fuelcellmarkets.com/content/images/articles/ps6.pdf |
below presents another example to extract the necessary information from the Tafel slope.
Name | Value extracted from Figure |
|---|---|
Eoc (V) | 65 |
V_1 (V) | 63 |
Vnom (V) | 45 |
Inom (A) | 133.3 |
Vmin (V) | 37 |
Imax (A) | 225 |
References
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