engleski

Power Management Strategies for Electrolyzer and Fuel Cell in Renewable Energy System

A renewable hydrogen energy system, consisting of a PV array, wind turbine, electrolyser, hydrogen storage, fuel cell and a battery bank is analysed. Its performance is simulated within one year using real meteorological hourly data for solar insolation and wind speed. Three different load profiles are analysed, namely constant load, daily cyclic load and daily cyclic load superimposed on seasonal variations. Simulation is used to compare two different control strategies for turning on and off the electrolyser and the fuel cell, namely (i) electrolyser is turned on whenever there is an excess of renewable power available, and the fuel cell is turned on whenever power from is not sufficient to satisfy the load. ; (ii) battery state of charge is used as a trigger for both electrolyser and fuel cell turning on and off. The result of this analysis is that carefully selected turn-on and turn-off points can significantly reduce the number of start-ups and shut-downs for both the electrolyser and the fuel cell, thus significantly improving their durability, while at the same time resulting in better overall efficiency of the energy storage system. Besides having a function of energy storage, such a system can also produce excess hydrogen, which can be used as transportation fuel.

Electrolyzer, fuel cell, power management strategy, renewable energy

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