A pressure difference compensation control method for compressed air grid-connected operation of multi-system air compressor stations

Abstract

The invention relates to a multi-system air compression station compressed air grid-connected operation differential pressure compensation control method. The lowest air supply pressures required by users of all single air compression unit systems need to be consistent. A plurality of systems comprises the multiple single air compression unit systems. The method comprises the following steps that firstly, the standard pressure of the air compression unit systems is set; secondly, the multi-system air compression unit grid-connected position is determined; thirdly, actual pressures of all system pipe networks are detected; fourthly, system differential pressures are computed; fifthly, grid-connected differential pressures are adjusted; sixthly, multi-system operation pressure alarming is set, if no pressure alarm exists, compensation control is completed, and if a pressure alarm exists, grid connection is relieved; and seventhly, compressed air grid-connected operation differential pressure compensation control is adjusted for normal operation. According to the method, on the basis that grid-connected stable operation is ensured, open degree piecewise functions are adopted for control during grid connection of an adjusting valve, interference between systems is reduced, and pressure stable transition in the multi-system grid connection system is ensured.

Description

technical field [0001] The invention relates to the pressure difference automatic control technology of an air compressor station. Specifically, the present invention relates to a pressure difference compensation control method for compressed air of a system air compressor station connected to the grid. Differential compensation control ensures a smooth transition of pressure when multiple systems are connected to the grid, effectively improves the efficiency of the air compressor, and realizes the most economical operation mode. Background technique [0002] During the actual operation of the air compressor station, when the air compressor is running at low load, if the pressure in the air storage tank rises to the set pressure, it is necessary to adjust the pressure of the pipe network. [0003] There are three main types of technologies that are most widely used today: [0004] The first is the automatic unloading technology of the air compressor, which automatically se...

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Problems solved by technology

[0005] The second is the overpressure interlock start-stop electrical control technology of the air compressor. This technology will cause frequent start-stop of the motor when the load changes greatly and the capacity of the air storage tank is small.

It overcomes the control of multiple compressors (or pumps) that only serve as auxiliary start and stop switches in the prior art, cannot be continuously adjusted, and cannot realize the soft start of multiple air compressors, resulting in impact on the power grid and air supply pressure The disadvantages, improve the stability of gas supply

[0013] However, the problems or defects in the above-mentioned previous technical solutions are: when the compressed air of multi-system air compressor stations is connected to the grid, it is difficult to control the pressure difference compensation of each single air compressor unit system, so it is difficult to ensure that multiple systems are connected to the grid At the same time, it is impossible to compensate the mutual air supply volume according to the change of different air loads of each system, so as to more effectively improve the use efficiency of the air compressor during the operation of multiple air compressor units and achieve the most economical mode of operation

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