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A Predictive Current Control Technique on Fuel Cell Based Distributed Generation in a Standalone AC Power Supply 902 Figure 12: Duty cycle of fuel cell and backup battery's converters 6. Conclusions In this research it has been presented a new predictive current control based method to convert the generated dc output voltage of fuel cell into a higher regulated dc voltage. The suggested algorithm calculates the required current of load and capacitor to regulate and control DC output at a desired voltage level on the basis of adopted system (Fuel cell in parallel with backup battery and interfaced converters). Investigated studies illustrate that the worst state of fuel cell based distributed generation systems in a standalone AC power supply is increment of load during fuel cell's output voltage failures. The main objective of this research is improved FC based system in critical conditions. Clearly, backup battery has two tasks: 1. DC link capacitor's voltage regulation in desired level. 2. Transient states of system variation reduction. According to the simulation results, the output parameters have the desired value and minimum transient state together. In conclusion, the suggested predictive current control based method is capable to achieve mentioned goals with good performance of system's interfaced converters. Simulation results with MATLAB reflect the potentiality of this controller for the fuel cell based DG applications.
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