Method of operating an electrolyser system

Abstract

A method of operating an electrolyser system comprising a plurality of stacks of electrolyser cell units. A production rate differs between stacks of the plurality of stacks. The method comprising: identifying a first subset of the plurality of stacks characterised by a first production rate at a nominal temperature and voltage; identifying a second subset of the plurality of stacks characterised by a second production rate at the nominal temperature and voltage; and identifying an overall production rate target for the plurality of stacks. The method further comprising: determining a plurality of subsidiary production rate targets for the respective subsets of the plurality of stacks based on dividing the overall production rate target by the number of stacks in the plurality of stacks; deriving a value for a first control parameter for the first subset of the plurality of stacks to satisfy their subsidiary production rate target; and controlling the plurality of stacks at the overall production rate target using a first control parameter derived for the first subset of the plurality of stacks.

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