Method for on-demand closed-loop control of an electrochemical plant

The present invention relates to a method for on-demand closed-loop control of an electrochemical plant, which plant comprises modules and an open-loop control unit, each module being controlled individually by the open-loop control unit and supplied with a module-specific electric operating current in order for each module to produce a separate product current, the product currents of the individual modules, which modules are connected in parallel with regard to their product currents, being joined to form one total product current of the plant. The method is characterised in that, when a starting condition is present, the following steps are carried out by the open-loop control unit: detecting a present total product current requirement 1, detecting the present efficiency of the modules of the electrochemical plant, which depends on the ratio of the particular operating current and product current 2, determining the modules which are ready for use 3, determining module-specific desired operating currents for the modules which are ready for use to cover the present total product current requirement from a range of permissible module-specific desired operating currents depending on the efficiency of the modules and the present total product current requirement 4, adjusting the operating currents of the modules which are ready for use to the determined module-specific desired operating currents 5.