Parallel magnetic suspension air compressor parallel and withdrawal network method, system, electronic equipment and medium

Abstract

The application discloses a parallel magnetic suspension air compressor parallel and off-grid method, system, electronic equipment and medium, real-time collection of the rotation speed, exhaust pressure, flow, rotor vibration displacement and acceleration signal of each parallel magnetic suspension air compressor and pipe network pressure, and completion of signal filtering pretreatment; for the parallel and off-grid of the magnetic suspension air compressor, corresponding execution of the corresponding parallel and off-grid control logic; when parallel, the differential pressure, flow and rotation speed three parameter dynamic matching threshold of the magnetic suspension air compressor to be connected to the grid is established, only when the parameters all meet the parallel conditions, the parallel is started, when off-grid, the gradient unloading is carried out on the magnetic suspension air compressor to be off-grid, and when the load reaches the set value, the emptying valve is opened to off-grid; by establishing the three parameter dynamic pre-matching threshold, and gradient load adjustment when parallel and off-grid, the parallel pressure difference impact and shutdown secondary reverse flow impact problem is solved from the source, the pressure fluctuation and airflow disturbance of the multi-machine parallel start-stop process is reduced, and the service life is prolonged.

Description

Technical Field

[0001] This invention relates to the field of parallel air compressor unit control technology, specifically to a method, system, electronic equipment, and medium for merging and de-energizing parallel magnetic levitation air compressors. Background Technology

[0002] The existing air compressor equipment uses independent control logic for individual unit start-up, shutdown, and grid connection. There is no coordination and matching mechanism between the speed-up and pressure-building process of the unit to be put into operation and the operating units. There is a huge pressure difference between the exhaust pressure and flow rate of the unit to be put into operation and the pipeline pressure. At the moment of grid connection, a violent transient airflow impact will be generated, causing a sudden rise and fall in pipeline pressure. This not only leads to unstable system air supply pressure, but also generates high-frequency airflow disturbances, which are transmitted to the rotors of all operating units.

[0003] Magnetic levitation bearings have no mechanical contact and adjustable stiffness and flexibility, making them extremely sensitive to transient external force impacts. Under traditional start-stop methods, airflow impact loads are instantly superimposed on the rotor, causing instantaneous rotor eccentricity and a sudden increase in radial vibration, exceeding the stable control range of the magnetic bearing. This results in instantaneous levitation jitter, sudden changes in load capacity, and spikes in magnetic control current. Frequent start-stop switching causes aging of the magnetic bearing power devices, rotor magnetic polarization losses, and a decrease in levitation accuracy, significantly shortening the service life of the core components of the entire machine.

[0004] Existing technologies lack a precise pre-matching mechanism for pressure, flow rate, and speed before grid connection, and magnetic levitation air compressors rely solely on fixed speed thresholds for grid connection determination. Under different ambient temperatures, pipeline resistance, and unit losses, the fixed matching parameters cannot be adapted, often resulting in two extreme operating conditions: "low-pressure grid connection backflow" and "high-pressure grid connection impact." This can cause airflow turbulence and short-term resonance in the parallel system, and even trigger protective shutdowns of the units, disrupting the stability of continuous industrial air supply.

[0005] Meanwhile, traditional magnetic bearing control algorithms are designed for steady-state operation. PID fixed gain and conventional vibration suppression logic can only offset small-amplitude steady-state vibrations. For sudden, transient impact vibrations during start-up and shutdown, they suffer from problems such as response lag, insufficient suppression, and severe overshoot, failing to quickly offset transient impact loads and thus unable to achieve precise protection of magnetic bearings under transient operating conditions. Summary of the Invention

[0006] Technical objective: To address the shortcomings of existing parallel magnetic levitation air compressors in terms of grid connection and deactivation control and magnetic bearing protection, this invention discloses a parallel magnetic levitation air compressor grid connection and deactivation method, system, electronic equipment, and medium.

[0007] Technical solution: To achieve the above technical objectives, the present invention adopts the following technical solution: A method for merging and de-energizing a parallel magnetic levitation air compressor includes the following steps: S01. Real-time acquisition of the speed, exhaust pressure, flow rate, rotor vibration displacement and acceleration signals of the magnetic levitation air compressor to be connected in parallel, as well as the pipeline pressure, and completion of signal filtering preprocessing; S02. For grid connection and shutdown of the magnetic levitation air compressor, corresponding grid connection and shutdown control logic is executed. During grid connection, a dynamic matching threshold for the three parameters of differential pressure, flow rate, and speed of the magnetic levitation air compressor to be connected is established. Grid connection is initiated only when all parameters meet the grid connection conditions. The differential pressure matching condition is... ,in Real-time exhaust pressure of the magnetic levitation air compressor awaiting grid connection. For pipeline pressure, The maximum permissible differential pressure is set; the flow matching condition is... ,in, The exhaust flow rate of the magnetic levitation air compressor to be connected to the grid. For pipeline flow, The maximum permissible flow rate difference is set; the speed matching condition is... , This represents the real-time speed change rate of the magnetic levitation air compressor. The maximum allowable difference in the rate of change of the matching speed is set; during the removal from the grid, the magnetic levitation air compressor to be removed from the grid is subjected to gradient unloading, and the vent valve is opened to remove the compressor from the grid when the load reaches the set value.

[0008] Preferably, after the magnetic levitation air compressor is connected to the grid, the present invention adopts a load deviation adaptive gradient load increase strategy, with a load loading rate of... , As the baseline loading rate, This represents the current real-time load rate of the magnetic levitation air compressor. This refers to the rated full load rate of the magnetic levitation air compressor.

[0009] Preferably, the adaptive unloading rate formula of the present invention during the removal of the magnetic levitation air compressor from the grid is as follows: In the formula: As the reference unloading rate, This represents the current real-time load of the magnetic levitation air compressor. This is the rated load for the magnetic levitation air compressor.

[0010] Preferably, the present invention corrects the control parameters of the magnetic bearing of the magnetic levitation air compressor during the connection and disconnection of the magnetic levitation air compressor, including the following steps: S021. First, identify the transient operating condition changes of the magnetic levitation air compressor and define the transient impact judgment factor. , This is the weighting adjustment factor. For the instantaneous radial eccentric vibration displacement of the rotor, when At that time, it is determined that the transient impact condition has been entered. The threshold value for the set decision factor; S022. Then, dynamic damping and dynamic stiffness corrections are performed on the magnetic bearing. The dynamic damping correction formula is as follows: Dynamic stiffness correction formula: ,in, This is the dynamic damping correction factor. This is the dynamic stiffness correction factor. This represents the steady-state damping coefficient of the magnetic bearing. is the steady-state stiffness coefficient of the magnetic bearing.

[0011] Preferably, the present invention monitors the peak-to-peak value and impact factor of rotor vibration in real time, and when the convergence condition is met... When the transient condition ends, the magnetic bearing control parameters are restored to steady-state control parameters.

[0012] Preferably, when correcting the control parameters of the magnetic bearing, the present invention establishes the rotor vibration dynamics equation under transient conditions. Describe the forced vibration characteristics of the rotor and obtain the correction coefficients for the magnetic bearing control parameters. Equivalent mass of a high-speed rotor; This represents the steady-state damping coefficient of the magnetic bearing. This is the steady-state stiffness coefficient of the magnetic bearing; This represents the instantaneous radial eccentric vibration displacement of the rotor; For the electromagnetic support force of the magnetic bearing, Impact force applied to transient operating conditions.

[0013] This invention provides a parallel magnetic levitation air compressor connection and disconnection system, using the above-mentioned connection and disconnection method, including: a signal acquisition and preprocessing module, configured to acquire in real time the speed, exhaust pressure, flow rate, rotor vibration displacement and acceleration signals of each parallel magnetic levitation air compressor and the pipeline pressure, and to complete signal filtering and preprocessing; The grid connection and disconnection control module is used to execute the corresponding grid connection and disconnection control logic for the magnetic levitation air compressor when it is connected to the grid and shut down.

[0014] The present invention provides an electronic device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the above-described connection and disconnection methods.

[0015] A computer-readable storage medium having a computer program stored thereon that, when executed by a processor, implements the above-described methods for merging and de-merging networks.

[0016] Beneficial effects: The parallel magnetic levitation air compressor connection and disconnection method, system, electronic equipment and medium disclosed in this invention have the following beneficial effects: 1. This invention solves the problems of grid connection pressure difference impact and shutdown secondary backflow impact from the source by establishing a three-parameter dynamic pre-matching threshold and performing gradient load adjustment during grid connection and grid disconnection. It reduces pressure fluctuations and airflow disturbances throughout the start-up and shutdown process of multiple machines in parallel, reduces the impact on the magnetic levitation rotor, and extends its service life.

[0017] 2. This invention can identify transient impact conditions and adaptively modify the damping and stiffness of the magnetic bearing to specifically suppress transient impact vibrations, avoid rotor eccentricity, suspension shaking, and magnetic bearing current spikes caused during start-up and shutdown, significantly reduce the loss of core components, and double the service life of magnetic bearings and high-speed rotors.

[0018] 3. The paralleling and disconnection method of the present invention can avoid the instability and pressure fluctuation problems caused by the start-up and shutdown of the magnetic levitation air compressor, fully meet the 24-hour continuous and stable air supply needs of industrial sites, and enhance product competitiveness.

[0019] 4. This invention automatically strengthens protection only under transient impact conditions, and restores the magnetic levitation air compressor to normal parameters under steady-state conditions, without additional energy consumption, thus balancing equipment reliability and unit operating efficiency. Detailed Implementation

[0020] Reference will now be made in detail to embodiments of the present disclosure, one or more examples of which are set forth herein. Each embodiment and example is provided by way of explanation of the apparatus, composition, and materials of the present disclosure, and not by way of limitation. Rather, the following description provides convenient illustrations for implementing exemplary embodiments of the present disclosure. Indeed, it will be apparent to those skilled in the art that various modifications and variations can be made to the teachings of the present disclosure without departing from the scope or spirit of the present disclosure.

[0021] Example 1: This invention provides a method for connecting and disconnecting parallel magnetic levitation air compressors, including the following steps: S01. Real-time acquisition of the rotational speed, exhaust pressure, flow rate, rotor vibration displacement and acceleration signals of the magnetic levitation air compressor to be connected in parallel, as well as the pipeline pressure, and completion of signal filtering preprocessing. The signal filtering preprocessing adopts the sliding window filtering method; the pipeline pressure is the pressure on the main manifold of the magnetic levitation air compressor unit to be connected in parallel.

[0022] S02. For grid connection and shutdown of the magnetic levitation air compressor, corresponding grid connection and shutdown control logic is executed. During grid connection, a dynamic matching threshold for the three parameters of differential pressure, flow rate, and speed of the magnetic levitation air compressor to be connected is established. Grid connection is initiated only when all parameters meet the grid connection conditions. The differential pressure matching condition is... ,in Real-time exhaust pressure of the magnetic levitation air compressor awaiting grid connection. For pipeline pressure, To set the maximum permissible differential pressure, the rated exhaust pressure of the unit is used as the benchmark, and 1.5% to 5% of the rated pressure is taken as the initial calibration value; the flow matching condition is... ,in, The exhaust flow rate of the magnetic levitation air compressor to be connected to the grid. For pipeline flow, To set the maximum permissible flow difference, the rated exhaust flow of a single unit is used as the benchmark, and 3% to 8% of the rated flow is taken as the initial value; the speed matching condition is... , This represents the real-time speed change rate of the magnetic levitation air compressor. The maximum allowable difference in the rate of change of the matching speed is set to be 0.5%~2% of the rated speed. When removing the magnetic levitation air compressor from the grid, the compressor to be removed from the grid is subjected to gradient unloading, and the vent valve is opened to remove the compressor from the grid when the load reaches the set value.

[0023] This invention employs a load deviation adaptive gradient load increase strategy after the magnetic levitation air compressor is connected to the grid, with a load loading rate of... , As the baseline loading rate, This represents the current real-time load rate of the magnetic levitation air compressor. This refers to the rated full load rate of the magnetic levitation air compressor.

[0024] The reference loading rate is selected based on the capacity level of the magnetic levitation air compressor. For rated flow ≤ 50 m³ / min or power ≤ 150 kW, the reference loading rate is set to 2%~3% of rated load / second; for rated flow 50~150 m³ / min or power 150~400 kW, the reference loading rate is set to 1.5%~2% of rated load / second; for rated flow ≥ 150 m³ / min or power ≥ 400 kW, the reference loading rate is set to 1%~1.5% of rated load / second.

[0025] The adaptive unloading rate formula for the magnetic levitation air compressor during net removal is as follows: In the formula: As the reference unloading rate, This represents the current real-time load of the magnetic levitation air compressor. This is the rated load for the magnetic levitation air compressor.

[0026] The reference loading rate is selected based on the capacity level of the magnetic levitation air compressor. For rated flow ≤ 50 m³ / min or power ≤ 150 kW, the reference unloading rate is set to 2.5%~4% of rated load / second; for rated flow 50~150 m³ / min or power 150~400 kW, the reference unloading rate is set to 2%~3% of rated load / second; for rated flow ≥ 150 m³ / min or power ≥ 400 kW, the reference unloading rate is set to 1.5%~2.5% of rated load / second.

[0027] By using the above-mentioned methods for merging and unloading the load, the pressure impact of the magnetic levitation air compressor on the entire pipeline network can be reduced, thereby mitigating the impact on the magnetic bearing of the magnetic levitation air compressor, reducing the impact force at the source, and ensuring the smooth operation of merging and unloading the network.

[0028] Example 2: Based on Example 1, in order to further effectively protect the magnetic bearing and weaken the impact generated during the start-up and shutdown of the magnetic levitation air compressor and the influence of pipeline pressure fluctuations on the magnetic bearing during the operation of parallel units, this invention corrects the magnetic bearing control parameters of the magnetic levitation air compressor when the magnetic levitation air compressor is connected to or disconnected from the network, thereby achieving active protection.

[0029] The correction process includes the following steps: S021. First, identify the transient operating condition changes of the magnetic levitation air compressor and define the transient impact judgment factor. , This is the weighting adjustment factor. This represents the instantaneous radial eccentric vibration displacement of the rotor. This represents the instantaneous radial eccentric vibration displacement velocity of the rotor. This represents the instantaneous radial eccentric vibration displacement acceleration of the rotor; when At that time, it is determined that the transient impact condition has been entered. The threshold value for the set decision factor.

[0030] in The settings are achieved by collecting steady-state operating data of the magnetic levitation air compressor under all operating conditions from 0 to 100% load and 0.6 to 0.8 MPa rated pressure, and taking data from all operating conditions. The 95th percentile value is used as the baseline value. To avoid false triggering of protection due to minor fluctuations during steady-state operation, a safety margin of 1.5 to 2 times is added: .

[0031] In the weighting adjustment coefficient, It represents the vibration acceleration weight, reflecting the suddenness and severity of the impact. The acceleration change of transient impact occurs much earlier than the displacement change, and it is the first characteristic signal of the impact. The displacement rate of change weight reflects the duration of the impact and the rotor eccentricity speed. Its main function is to prevent long-term large displacement from causing stator rubbing against the magnetic bearing. Magnetic levitation bearings are more sensitive to transient acceleration impacts and respond to acceleration signals faster; therefore, the vibration acceleration weight is much higher than the displacement rate of change weight, and it is usually... Take 1, Take 0.1.

[0032] S022. Then, dynamic damping and dynamic stiffness corrections are performed on the magnetic bearing. The dynamic damping correction formula is as follows: Dynamic stiffness correction formula: ,in, This is the dynamic damping correction factor. This is the dynamic stiffness correction factor. This represents the steady-state damping coefficient of the magnetic bearing. The steady-state stiffness coefficient of the magnetic bearing is given. The modified constraint conditions must meet the maximum damping constraint, maximum stiffness constraint, and current constraint of the magnetic bearing. The maximum damping constraint and maximum stiffness constraint are preset values ​​to avoid excessive damping which may cause low-frequency oscillations, and to avoid excessive stiffness which may significantly increase the magnetic control current and reduce the rotor's disturbance rejection margin. The current constraint needs to keep the peak value of the modified magnetic control current ≤ 80% of the rated current of the power device, with a 20% safety margin reserved to prevent overcurrent damage to the power device.

[0033] When correcting the control parameters of the magnetic bearing, this invention establishes the rotor vibration dynamics equation under transient conditions. Describe the forced vibration characteristics of the rotor and obtain the correction coefficients for the magnetic bearing control parameters. Equivalent mass of a high-speed rotor; This represents the steady-state damping coefficient of the magnetic bearing. This is the steady-state stiffness coefficient of the magnetic bearing; This represents the instantaneous radial eccentric vibration displacement of the rotor; For the electromagnetic support force of the magnetic bearing, Impact force applied to transient operating conditions.

[0034] Impact force applied under transient conditions , Let v(t) be the equivalent area of ​​the rotor airflow under force. The instantaneous velocity of the airflow. This indicates that the real-time exhaust pressure of the magnetic levitation air compressor to be connected to the grid is... The pipeline pressure of the integrated magnetic levitation air compressor pipeline network Pressure difference between them; To compress air density, This refers to the instantaneous impact flow rate generated by the pressure difference. , For pipeline flow coefficient, The flow area of ​​the pipeline for a magnetic levitation air compressor. To compress air density, For symbolic functions, Its function is to indicate the direction of airflow based on the sign of the pressure difference.

[0035] Pipeline flow coefficient By selecting 3 to 5 steady-state operating conditions within the range of 20% to 100% of the rated load, and ensuring each condition operates stably for ≥60 seconds, the pressure difference across the check valve is recorded simultaneously. Exhaust flow rate Q, exhaust temperature (used to calculate compressed air density) The detection points must meet the requirements for straight pipe sections upstream and downstream (upstream ≥ 20 times the pipe diameter, downstream ≥ 10 times the pipe diameter) to avoid eddy current interference in the measurement. Calculate the flow rate point by point using the flow formula. The average value of all calculated values ​​under all operating conditions is taken as the final calibrated pipeline flow coefficient.

[0036] The corrected transient rotor dynamics equation is: By dynamically increasing the control stiffness and damping, transient impact loads are quickly offset, and the rotor vibration displacement is rapidly converged to a safe range, protecting the levitation stability of the magnetic bearing. During the impact protection process for the magnetic bearing, this invention monitors the rotor vibration peak-to-peak value and impact factor in real time. When the convergence condition is met... When the transient condition ends, the magnetic bearing control parameters are restored to steady-state control parameters.

[0037] Calculate the rated frequency: Determine the peak-to-peak value of the steady-state allowable vibration displacement. Magnetic levitation air compressors typically require a steady-state radial vibration peak-to-peak value ≤10~20μm, corresponding to the A / B class operating range of ISO 14839-2 standard. Under sinusoidal vibration, the relationship between the peak velocity and peak displacement is as follows: ; 1.2~1.5 is the set safety margin.

[0038] This invention provides a parallel magnetic levitation air compressor connection and disconnection system, using the above-mentioned connection and disconnection method, including: a signal acquisition and preprocessing module, configured to acquire in real time the speed, exhaust pressure, flow rate, rotor vibration displacement and acceleration signals of each parallel magnetic levitation air compressor and the pipeline pressure, and to complete signal filtering and preprocessing; The grid connection and disconnection control module is used to execute the corresponding grid connection and disconnection control logic for the magnetic levitation air compressor when it is connected to the grid and shut down.

[0039] The present invention provides an electronic device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the above-described connection and disconnection methods.

[0040] This invention discloses a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the above-described merging and de-merging methods.

[0041] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for merging and de-energizing a parallel magnetic levitation air compressor, characterized in that, Including the following steps: S01. Real-time acquisition of the speed, exhaust pressure, flow rate, rotor vibration displacement and acceleration signals of the magnetic levitation air compressor to be connected in parallel, as well as the pipeline pressure, and completion of signal filtering preprocessing; S02. For grid connection and shutdown of the magnetic levitation air compressor, corresponding grid connection and shutdown control logic is executed. During grid connection, a dynamic matching threshold for the three parameters of differential pressure, flow rate, and speed of the magnetic levitation air compressor to be connected is established. Grid connection is initiated only when all parameters meet the grid connection conditions. The differential pressure matching condition is... ,in Real-time exhaust pressure of the magnetic levitation air compressor awaiting grid connection. For pipeline pressure, The maximum permissible differential pressure is set; the flow matching condition is... ,in, The exhaust flow rate of the magnetic levitation air compressor to be connected to the grid. For pipeline flow, The maximum permissible flow rate difference is set; the speed matching condition is... , This represents the real-time speed change rate of the magnetic levitation air compressor. The maximum allowable difference in the rate of change of the matching speed is set; during the removal from the grid, the magnetic levitation air compressor to be removed from the grid is subjected to gradient unloading, and the vent valve is opened to remove the grid when the load reaches the set value; When merging and de-merging a magnetic levitation air compressor, the control parameters of the magnetic bearing of the magnetic levitation air compressor are corrected, including the following steps: S021. First, identify the transient operating condition changes of the magnetic levitation air compressor and define the transient impact judgment factor. , This is the weighting adjustment factor. For the instantaneous radial eccentric vibration displacement of the rotor, when At that time, it is determined that the transient impact condition has been entered. The threshold value for the set decision factor; S022. Then, dynamic damping and dynamic stiffness corrections are performed on the magnetic bearing. The dynamic damping correction formula is as follows: Dynamic stiffness correction formula: ,in, This is the dynamic damping correction factor. This is the dynamic stiffness correction factor. This represents the steady-state damping coefficient of the magnetic bearing. This is the steady-state stiffness coefficient of the magnetic bearing; Real-time monitoring of rotor vibration peak-to-peak value and impact factor, when convergence conditions are met. When the transient condition ends, the magnetic bearing control parameters are restored to steady-state control parameters. When correcting the control parameters of the magnetic bearing, the rotor vibration dynamics equation under transient conditions is established. Describe the forced vibration characteristics of the rotor and obtain the correction coefficients for the magnetic bearing control parameters. Equivalent mass of a high-speed rotor; This represents the steady-state damping coefficient of the magnetic bearing. This is the steady-state stiffness coefficient of the magnetic bearing; This represents the instantaneous radial eccentric vibration displacement of the rotor; For the electromagnetic support force of the magnetic bearing, Impact force applied to transient operating conditions.

2. The method for merging and de-energizing a parallel magnetic levitation air compressor according to claim 1, characterized in that, After the magnetic levitation air compressor is connected to the grid, an adaptive gradient load increase strategy based on load deviation is adopted, with the load loading rate... , As the baseline loading rate, This represents the current real-time load rate of the magnetic levitation air compressor. This refers to the rated full load rate of the magnetic levitation air compressor.

3. The method for merging and de-energizing a parallel magnetic levitation air compressor according to claim 1, characterized in that, The adaptive unloading rate formula for the magnetic levitation air compressor during network disconnection: In the formula: As the reference unloading rate, This represents the current real-time load of the magnetic levitation air compressor. This is the rated load for the magnetic levitation air compressor.

4. A parallel magnetic levitation air compressor grid connection and disconnection system, using the grid connection and disconnection method described in any one of claims 1-3, characterized in that, include: The signal acquisition and preprocessing module is configured to acquire in real time the speed, exhaust pressure, flow rate, rotor vibration displacement and acceleration signals of each parallel magnetic levitation air compressor, as well as the pipeline pressure, and to complete the signal filtering and preprocessing. The grid connection and disconnection control module is used to execute the corresponding grid connection and disconnection control logic for the magnetic levitation air compressor when it is connected to the grid and shut down.

5. An electronic device, characterized in that, include: It includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the merging and de-merging method as described in any one of claims 1 to 3.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the merging and de-merging method as described in any one of claims 1 to 3.