Fuel Cell based on a voltage-current lookup table characteristic
Modeling a Fuel Cell based on the Voltage/Current Density graph.
The model is based on the Voltage/Current Density characteristic provided by the manufacturer of the Fuel Cell.
The manufacturer provides this data per stack. This data is used in Caspoc and forms the basis of the Fuel Cell model.
On the X-axis the current density in mA/cm2. The y-axis is the voltage per stack. By defining the number of stacks and the area of the stack, the total power produced by the fuel cell can be calculated. The voltage of the fuel cell is depending on the current drawn form the fuel cell as indicated by the graph above.
The Fuel Cell library block is selected from the library at Components/Library/GreenEnergy/FuelCell
In the sample section is an example of a fuel cell connected to a boost converter.
It has 4 terminals. On the left side is the terminal for the name of the data file describing the characteristic. It should be connected to a block called FILENAME that is selected from Components/Blocks/Miscellaneous. In the block Filename you have to specify the file name for the characteristic at the input field Text2:
On the right side are the electrical terminals that are connected to the boost converter. The connection on the top of the fuel cell is for displaying the amount of power that is delivered by the fuel cell. This signal can be displayed in a scope or used as a signal in a block diagram.
The Fuel Cell block has two parameters, the active area per cell and the number of stacks.
The active area is given in cm2 and the number of stacks is given by the parameter #stacks.
- Active Area
- Number of stacks
- Internal resistance
The amount of power delivered by the fuel cell equals 8.1Volt*25Ampere=204 Watt. This value can be read from the terminal on top of the fuel cell.