Installation and method for producing liquefied hydrogen

An installation for producing liquefied hydrogen comprising a gaseous hydrogen generator configured to produce gaseous hydrogen, a liquefier, a supply duct connecting a gaseous hydrogen outlet of the gaseous hydrogen generator to an inlet of the liquefier, the liquefier comprising a refrigerator having a cycle circuit configured to provide cooling power and cool the gaseous hydrogen from the supply duct with a view to the liquefaction thereof, the installation comprising at least one compressor for the gaseous hydrogen produced by the gaseous hydrogen generator and a buffer store configured to store the compressed gaseous hydrogen between the gaseous hydrogen generator and the liquefier, the buffer store being connected to the supply duct via a set of bypass duct(s), the buffer store and the liquefier are connected in parallel to the gaseous hydrogen outlet of the gaseous hydrogen generator, the refrigerator being of the type having a cycle circuit configured to produce cooling power by subjecting a cycle gas to a thermodynamic cycle, the cycle circuit comprising a set of compressor(s) for the cycle gas, at least one member for cooling the compressed cycle gas and at least one member for expanding the compressed cycle gas, wherein the cycle gas is hydrogen and in that the buffer store is connected to the cycle circuit so as to supply the cycle circuit with hydrogen and/or to be supplied with hydrogen by the cycle circuit.