Frequency conversion control device of air compressor set of paper mill

The invention discloses a frequency conversion control device of an air compressor set of a paper mill, and belongs to the technical field of equipment energy conservation control. The frequency conversion control device comprises two or more air compressors, a frequency converter, a PLC and an air storage tank, wherein air conveying pipelines of the air compressors are connected with the air storage tank in parallel, and the air storage tank is connected to air utilization equipment through an air outlet pipe; power loops of motors of the air compressors comprises first loops and second loops; the first loops are connected with the first loops through first switches, a frequency converter is connected to a power line, and the second loops are directly connected to the power line through second switches; and the output node of the PLC is connected to control coils of the first switches and the control coils of the second switches, so that automatic switching between the power frequencyand the frequency conver