Compressor surge prediction control method based on magnetic suspension axial position control

Abstract

The invention provides a compressor surge prediction control method based on magnetic suspension axial position control. The compressor surge prediction control method comprises the steps that a surge curve is drawn by collecting compressor outlet pressure values and flow values at different rotating speeds; a function relation between pressure rise and mass flow is derived by establishing a compressor mathematical model; a compressor outlet pressure prediction model is established to determine the coordinates of an operating point of a compressor at the next moment; and when the coordinates of the operating point intersect with the surge curve, that surge will occur at the next moment is indicated, and the axial direction and the radial direction of a bearing in the compressor need to be adjusted to eliminate surge, namely, the distance between a rotor axial impeller and a volute is adjusted, and the rotor radial control current is increased to eliminate surge. According to the compressor surge prediction control method, whether surge occurs on the magnetic suspension compressor at the next moment or not can be predicted, and then a control strategy is adjusted so that the magnetic suspension compressor can always keep operating close to the right side of a surge line, the surge margin is effectively reduced, and the compressor can effectively avoid surge and can operate at the highest efficiency point.

Description

technical field [0001] The invention belongs to the technical field of magnetic levitation motor control, and in particular relates to a compressor surge prediction control method based on magnetic levitation axial position control. Background technique [0002] Compression systems are widely used in gas turbine engines, turbocharged engines and industrial compression equipment. In order to improve work efficiency, the mechanical structure of the compressor has undergone great changes. Ordinary centrifugal compressors generally use an induction motor as the driving source, and are connected to the impeller of the compressor through a speed-increasing gear to obtain a high speed of the impeller of the compressor. However, due to the addition of gears and bearings, this high-speed system produces a large friction loss, so a lubrication circulation system is required to lubricate these devices, which makes the entire compressor system very bulky. [0003] In order to overcome...

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Problems solved by technology

But these two methods either severely limit the operating range at low speeds, or reduce the efficiency of the system and cause energy loss

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