ENEA Wind-hydrogen Stand-alone System

7 ENEA Wind-hydrogen Stand-alone System 

The plant comprised the wind turbine, the electrolyser unit complete with its built-in controllable power supply, battery storage, a DC-DC controllable converter, and two dump loads (0.5 and 2 kW) controlled by two voltage-actuated relays. The auxiliary equipment (electrolyser pumps, valves, control equipment, and water demineralisation unit) for the demonstration plant were supplied by the grid for convenience. 

The plant could be operated in 2 modes, with respect to electrolyser loading  

Wind-powered The electrolyser current is controlled by the DC-DC step-down converter, while the current to the battery storage was not controlled, with the battery acting as an energy buffer, and the dump loads were controlled in order to limit the maximum voltage to the battery to prevent overcharging. 

Controlled power supply The electrolyser is supplied by the controllable power supply, either manually or PC-controlled to emulate the operation from a different type of plant. 

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