(57) A device and a method for controlling a plurality of compressors (1-3) arranged for
jointly producing a pressurized fluid, wherein each of the compressors comprises a
valve (7-9), the position of the valve determining the size of the flow of the fluid
and the compressor having at least three different states: a shut-off state in which
the compressor has zero voltage and the valve is in a closed position, an unloaded
state in which the compressor is under a voltage and the valve is in a closed position,
and a loaded state in which the compressor is under a voltage and the valve is an
at least partly open position. Information about each of the compressors regarding
the power that the compressor consumes in the loaded and the unloaded states and which
flow or flows that the compressor can deliver are stored. Information is received
regarding the pressure of the fluid (P1-P4) and current valve positions for the compressors are received. The current need of
fluid is estimated, based on the current valve positions of the compressors, the flow
that the compressor can deliver and the pressure in the fluid. The valve positions
of the compressors are adjusted with regard to the current need of fluid and the energy
consumption of the compressors in a number of possible sets of valve positions, which
meet the current need of fluid.
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