**4. Implementation in MATLAB/Simulink APU based on fuel cell**

**Figure 9** shows the simulation scheme made in MATLAB/Simulink. It contains the sources, converters, and the source management system. The performance management scheme proposed in this paper was tested by numerical simulations. The energy management system block outputs the control signals required by DC-to-DC converter. The fuel cell power is identified by the battery state of change and the required load power (*Pload*). The bus voltage is stabilized through the battery converters for energy management system strategies. The management system was tested using an electric load profile, presented in the **Figure 10**. **Figure 11** shows the time variations of the voltage and current of the fuel cell, **Figure 12** shows the time variations of the voltage and current of the converter related to the fuel cell, and **Figure 13** shows the

*Modeling and Simulation of APU Based on PEMFC for More Electric Aircraft DOI: http://dx.doi.org/10.5772/intechopen.105597*

**Figure 9.** *The APU based on fuel cell model in MATLAB/Simulink.*

#### **Figure 10.**

*Load profile used in numerical simulations.*

#### **Figure 11.**

*Variation in time of the voltage and current corresponding to the output terminals of fuel cell.*

time variation of fuel consumption. **Figure 14** shows the time variations of battery voltage and current, and **Figure 15** shows the time variations of battery converter voltage and current.

**Figure 12.**

*Variation in time of the voltage and current of DC-to-DC converter connected to the fuel cell.*

**Figure 13.** *Variation in time of fuel consumption.*

**Figure 14.** *Variation in time of the voltage and current corresponding to the output terminals of a battery.*

**Figure 15.**

*Variation in time of the voltage and current of DC-to-DC converter connected to the battery.*

*Modeling and Simulation of APU Based on PEMFC for More Electric Aircraft DOI: http://dx.doi.org/10.5772/intechopen.105597*
