CN-122014660-A - Anti-surge control method, system and storage medium for centrifugal compressor

Abstract

The invention discloses an anti-surge control method, an anti-surge control system and a storage medium for a centrifugal compressor, which relate to the technical field of anti-surge control for the centrifugal compressor, and are characterized in that a reference prediction operation point is predicted through a physical model of the compressor, a future residual error is predicted through a data-driven residual error compensation model, and the reference prediction operation point and the future residual error are fused to obtain a high-precision fusion prediction result, so that the high-precision dynamic prediction of a surge boundary is realized. By calculating the dynamic surge margin in advance and executing the hierarchical intervention control strategy based on the dynamic surge margin, the transition from 'passive response' to 'active prevention' is realized, and the timeliness and the safety of anti-surge are remarkably improved. Through dynamic and accurate margin management, the compressor can be operated closer to a high-efficiency area on the premise of ensuring safety, so that the overall energy efficiency is improved.

Inventors

• WU YANGUANG
• YANG HUI
• LI JINGMAO
• Leng Wenxing
• HUANG FEIQIAO
• WU ZHICONG
• ZHANG CHUAN

Assignees

• 雷茨智能装备(赣州)有限公司

Dates

Publication Date

20260512

Application Date

20260226

Claims (10)

1. 1. A method for controlling anti-surge of a centrifugal compressor is characterized by comprising the following steps: S1, collecting running state parameters of a compressor in real time; s2, inputting the running state parameters into a physical model of the compressor, and outputting a reference prediction running point; S3, calculating a historical residual sequence, and predicting future residual by a data-driven residual compensation model; s4, fusing the reference prediction operation point with the future residual error to obtain a high-precision fusion prediction result; S5, deducing a dynamic surge boundary based on the high-precision fusion prediction result, and calculating a dynamic surge margin; And S6, executing a hierarchical intervention control strategy according to the dynamic surge margin.
2. 2. The method of claim 1, wherein in step S1, the operating state parameters include compressor speed, inlet guide vane opening, inlet and outlet pressure, inlet and outlet temperature, flow, motor power, and shafting vibration signals.
3. 3. The method for anti-surge control of a centrifugal compressor according to claim 1, wherein in step S2, said physical model of the compressor is constructed based on principles of hydrodynamics and thermodynamic first principles.
4. 4. The method for controlling anti-surge of a centrifugal compressor according to claim 1, wherein in step S3, the historical residual sequence is obtained by comparing a historical reference predicted output value of a physical model of the compressor with an actual measured value of a synchronous sensor, and the data-driven residual compensation model is a long-term and short-term memory network or a gating circulation unit.
5. 5. The method of claim 1, wherein in step S4, the fusion is linear addition, and the fusion formula is high-precision fusion prediction result=reference prediction operation point+missing residual.
6. 6. The method of claim 1, wherein in step S6, said hierarchical intervention control strategy comprises: When the dynamic surge margin is greater than a first threshold, not intervening; When the dynamic surge margin is less than or equal to the first threshold value and greater than the second threshold value, performing fine tuning control; And when the dynamic surge margin is less than or equal to the second threshold, performing rapid protection control.
7. 7. The method of claim 1, wherein the fine control is to slowly pre-open the bypass valve, fine control speed, or fine control guide vane in a very small step size, and the rapid protection control is to rapidly increase the bypass valve opening.
8. 8. The method of claim 1, wherein in some embodiments the first threshold is 15% and the second threshold is 8%.
9. 9. An anti-surge control system for a centrifugal compressor, comprising: the data acquisition module is used for acquiring the running state parameters of the compressor in real time; the reference prediction module is used for inputting the running state parameters into a compressor physical model and outputting reference prediction running points; the residual processing module is used for calculating a historical residual sequence and predicting future residual by a data-driven residual compensation model; the fusion prediction module is used for fusing the reference prediction operation point with the future residual error to obtain a high-precision fusion prediction result; the surge margin prediction module is used for deducing a dynamic surge boundary based on the high-precision fusion prediction result and calculating a dynamic surge margin; and the hierarchical control module is used for executing a hierarchical intervention control strategy according to the dynamic surge margin.
10. 10. A computer-readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements an anti-surge control method of a centrifugal compressor according to any one of claims 1-8.

Description

Anti-surge control method, system and storage medium for centrifugal compressor Technical Field The invention relates to the technical field of anti-surge control of centrifugal compressors, in particular to an anti-surge control method, an anti-surge control system and a storage medium of a centrifugal compressor. Background The magnetic suspension centrifugal refrigeration compressor is widely applied to the fields of large-scale central air conditioners, data center cooling and the like by virtue of oil-free, efficient, low-vibration and the like. The core component of the compressor is an impeller rotating at a high speed, however, under the working condition of small flow, the impeller is extremely easy to generate a surge (Surge). Surging is a severe unsteady flow unsteady phenomenon, and is accompanied with periodic backflow of air flow and severe pulsation of system pressure and flow, so that strong mechanical vibration can be induced, and failure of a magnetic suspension bearing, impeller damage and even complete machine scrapping can be caused in severe cases, thus forming a great threat to the safety and reliability of the system. The prior anti-surge technology mainly adopts a static margin control method based on a compressor characteristic diagram, and has the core logic that the surge line (Surge Line) of the compressor is measured through experiments, and the safety margin is shifted to the large flow direction by 10% -15% on the basis, so that the anti-surge control line is formed. When the compressor is running, the control system monitors the working point in real time, and once the working point touches or passes over the control line, the bypass valve or the hot gas bypass valve is quickly opened, and part of high-pressure gas is returned to the inlet of the compressor, so that the flow is increased, and the working point is far away from the surge area. However, this prior anti-surge technique has the following significant drawbacks: 1. The efficiency loss is severe-to ensure absolute safety, the fixed safety margin is usually set very conservative, resulting in the compressor not being able to operate in the high efficiency zone closest to the surge boundary most of the time, resulting in significant energy waste. 2. The compressor has poor adaptability, the surge boundary of the compressor is not unchanged, and the compressor can drift along with factors such as inlet air temperature/pressure, condensing pressure, equipment aging and abrasion, blade scaling and the like. The inability of a fixed control line to accommodate such dynamic changes may be excessive (wasting energy) under certain conditions and insufficient (presenting a safety risk) under other conditions. 3. Response hysteresis the method belongs to passive responsive control, the control action being triggered only when the operating point actually reaches the control line. For dynamic disturbances, the system may have instantaneously entered surge before the control action is fully effective, failing to prevent it in advance. Therefore, there is a need for a predictive anti-surge technique that can accurately predict surge boundaries, dynamically adjust safety margins, and intervene in advance to address the deficiencies of the prior art. Disclosure of Invention In order to overcome the defects in the prior art, the invention provides an anti-surge control method, an anti-surge control system and a storage medium of a centrifugal compressor, and aims to solve the problems of serious efficiency loss, poor adaptability, response hysteresis and the like in the existing anti-surge technology. The technical scheme adopted by the invention for solving the technical problems is that the anti-surge control method of the centrifugal compressor comprises the following steps: S1, collecting running state parameters of a compressor in real time; s2, inputting the running state parameters into a physical model of the compressor, and outputting a reference prediction running point; S3, calculating a historical residual sequence, and predicting future residual by a data-driven residual compensation model; s4, fusing the reference prediction operation point with the future residual error to obtain a high-precision fusion prediction result; S5, deducing a dynamic surge boundary based on the high-precision fusion prediction result, and calculating a dynamic surge margin; And S6, executing a hierarchical intervention control strategy according to the dynamic surge margin. As a further development of the invention, in step S1, the operating state parameters include compressor rotational speed, inlet guide vane opening, inlet/outlet pressure, inlet/outlet temperature, flow, motor power and shafting vibration signals. Through collecting multidimensional parameters including compressor rotating speed, inlet guide vane opening degree, inlet and outlet pressure, inlet and outlet temperature, flow, motor power and shafting vibration signals in