{HEAD ~ The object} of the present invention is {TAIL ~ a process} for controlling the active power injected into the grid by a generating plant for contributing to the stability of the power grid in the event of frequency variations 
is
{ HEAD ~ The object } of the present invention is { TAIL ~ a process } for controlling the active power injected into the grid by a generating plant for contributing to the stability of the power grid in the event of frequency variations
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