CN-122014654-A - Electromagnetic valve control method, system and medium for magnetic suspension centrifugal compressor

CN122014654ACN 122014654 ACN122014654 ACN 122014654ACN-122014654-A

Abstract

The invention discloses a control method, a system and a medium for an electromagnetic valve of a magnetic suspension centrifugal compressor, which relate to the technical field of compressor thermal management and comprise the steps of collecting data of real-time temperature of a motor stator and a driving plate, real-time load rate of the motor and environmental temperature; the method comprises the steps of collecting data, calculating temperature rise rate and environment temperature difference of a motor stator and a driving plate based on the collected data, carrying out normalization processing, calculating a heat accumulation index based on the real-time load rate of the motor and the normalized temperature rise rate and environment temperature difference, calculating predicted temperatures of the motor stator and the driving plate based on the real-time temperature and the temperature rise rate of the motor stator and the driving plate, and executing a hierarchical cooling control decision according to the predicted temperatures, the real-time temperature, the heat accumulation index and a preset threshold value of the motor stator and the driving plate. The invention systematically improves the accuracy, efficiency and reliability of the thermal management of the magnetic suspension centrifugal compressor through multidimensional data fusion, prospective prediction and intelligent decision.

Inventors

WU YANGUANG
FU HAITAO
YANG HUI
YU XINKE
Leng Wenxing
HUANG JIN
SUN CAIPENG

Assignees

雷茨智能装备(赣州)有限公司

Dates

Publication Date: 20260512
Application Date: 20260226

Claims (10)

1. The magnetic suspension centrifugal compressor electromagnetic valve control method based on multi-parameter fusion prediction is characterized by comprising the following steps: collecting data of real-time temperature, real-time load rate and environment temperature of a motor stator and a driving plate; Calculating the temperature rise rate and the environmental temperature difference of the motor stator and the driving plate based on the acquired data, and carrying out normalization processing; calculating a heat accumulation index based on the real-time load rate of the motor, the normalized temperature rise rate and the environment temperature difference; Calculating predicted temperatures of the motor stator and the driving plate based on the real-time temperatures and the temperature rise rates of the motor stator and the driving plate; And executing a hierarchical cooling control decision according to the predicted temperature, the real-time temperature, the heat accumulation index and the preset threshold value of the motor stator and the driving plate.
2. The method for controlling the electromagnetic valve of the magnetic suspension centrifugal compressor based on multi-parameter fusion prediction according to claim 1, wherein the temperature rise rate of the motor stator is as follows: ; The temperature rise rate of the driving plate is as follows: ; Wherein, T m (T) is the real-time temperature of the motor stator at the time T, T m (T- Δt) is the real-time temperature of the motor stator at the time T- Δt, Δt is the time window, T d (T) is the real-time temperature of the driving plate at the time T, and T d (T- Δt) is the real-time temperature of the driving plate at the time T- Δt.
3. The method for controlling the electromagnetic valve of the magnetic suspension centrifugal compressor based on multi-parameter fusion prediction according to claim 2, wherein the calculation formula of the heat accumulation index is as follows: ; Wherein HCI is a heat accumulation index, For the normalized motor stator temperature rise rate, For the normalized temperature rise rate of the driving plate, L (t) is the real-time load rate of the motor, For the normalized ambient temperature difference, T a (T) is the ambient temperature, T ref is the reference baseline temperature, α, β, γ, δ are weight coefficients, and α+β+γ+δ=1.
4. The method for controlling the electromagnetic valve of the magnetic suspension centrifugal compressor based on multi-parameter fusion prediction according to claim 3, wherein the calculation mode of the predicted temperature is as follows: Predicting the predicted temperature of a motor stator and the predicted temperature of a driving plate after a future time window delta t pred by adopting a linear extrapolation method; ; ; Wherein T m,pred is the predicted temperature of the motor stator, T m (T) is the real-time temperature of the motor stator at the time T, For the temperature rise rate of the motor stator, deltat pred is the future time window, T d,pred is the predicted temperature of the drive plate, T d (T) is the real-time temperature of the drive plate at the time T, To drive the rate of temperature rise of the plate.
5. The method for controlling the electromagnetic valve of the magnetic suspension centrifugal compressor based on multi-parameter fusion prediction as set forth in claim 1, wherein the hierarchical cooling control decision comprises switching an emergency cooling mode, a standby mode and a maintenance cooling mode to control the on-off state of the electromagnetic valve; when the predicted temperature exceeds the upper temperature limit, the heat accumulation index exceeds the opening threshold or the real-time temperature reaches the upper temperature limit, triggering an emergency cooling mode and opening the electromagnetic valve; When the heat accumulation index is lower than the closing threshold and the real-time temperature is lower than the lower temperature limit, triggering a standby mode and closing the electromagnetic valve; If in the emergency cooling mode, when the real-time temperature and the heat accumulation index are both separated from the emergency area, but the closing condition of the standby mode is not satisfied, the cooling mode is triggered and maintained, the electromagnetic valve is controlled through the pulse switch, and the duty ratio is dynamically adjusted according to the heat accumulation index.
6. The method for controlling the electromagnetic valve of the magnetic suspension centrifugal compressor based on multi-parameter fusion prediction as set forth in claim 4, wherein the preset threshold comprises an upper temperature limit and a lower temperature limit of a motor stator, an upper temperature limit and a lower temperature limit of a driving plate, an opening threshold and a closing threshold of a heat accumulation index and a minimum switching interval; The hierarchical cooling control decision comprises: A. And in the emergency cooling mode, when the electromagnetic valve is closed and the time interval between the electromagnetic valve and the last closing is more than or equal to the minimum switching interval, the electromagnetic valve is immediately opened if any one of the following conditions is met: a) The predicted temperature exceeds the limit of T m,pred ≥T max,motor or T d,pred ≥T max,driver ; b) The heat accumulation index exceeds the limit that HCI is more than or equal to HCI on ; c) The real-time temperature reaches the urgent upper limit of T m (t)≥T max,motor or T d (t)≥T max,driver ; B. And in the standby mode, when the electromagnetic valve is opened and the time interval between the electromagnetic valve and the last opening is more than or equal to the minimum switching interval, closing the electromagnetic valve if the following conditions are met simultaneously: a) The heat accumulation index is extremely low, and HCI is less than or equal to HCI off ; b) The real-time temperature is reduced to the lower temperature limit of T m (t)≤T min,motor and T d (t)≤T min,driver ; C. The controller controls the electromagnetic valve to perform pulse switching according to a certain duty ratio in a larger period, and the duty ratio can be dynamically adjusted according to the current heat accumulation index value, and the higher the heat accumulation index value, the larger the duty ratio; Wherein T m,pred is the predicted temperature of the motor stator, T max,motor is the upper temperature limit of the motor stator, T d,pred is the predicted temperature of the driving plate, T max,driver is the upper temperature limit of the driving plate, HCI is the heat accumulation index, HCI on is the opening threshold of the heat accumulation index, HCI off is the closing threshold of the heat accumulation index, T m (T) is the real-time temperature of the motor stator at the time T, T d (T) is the real-time temperature of the driving plate at the time T, T min,motor is the lower temperature limit of the motor stator, and T min,driver is the lower temperature limit of the driving plate.
7. The method for controlling the electromagnetic valve of the magnetic suspension centrifugal compressor based on multi-parameter fusion prediction according to claim 6, further comprising: the time interval between two actions of the electromagnetic valve is larger than the minimum switch interval, and the motor load rate is actively reduced when the emergency cooling condition is met but the electromagnetic valve cannot be opened immediately.
8. A magnetic suspension centrifugal compressor electromagnetic valve control system based on multi-parameter fusion prediction is characterized by comprising the following components: the motor stator temperature sensor is used for detecting the temperature of the motor stator; the driving plate temperature sensor is used for detecting the temperature of the driving plate; The environment temperature sensor is used for detecting the environment temperature of the compressor; the load detection module is used for detecting the real-time load rate of the motor; The electromagnetic valve is arranged on the refrigerant bypass circulation passage; the core controller is electrically connected with the motor stator temperature sensor, the driving plate temperature sensor, the ambient temperature sensor, the load detection module and the electromagnetic valve, and is used for executing data acquisition, processing, heat accumulation index calculation, temperature prediction and control decision and outputting control signals to drive the electromagnetic valve.
9. The electromagnetic valve control system of the magnetic suspension centrifugal compressor based on multi-parameter fusion prediction as set forth in claim 8, wherein the controller comprises a data acquisition module, a data processing module, a heat accumulation index calculation module, a temperature prediction module and a control decision module, and stores a preset threshold, a weight coefficient and a minimum switching interval; the data acquisition module is used for acquiring data of real-time temperature of the motor stator and the driving plate, real-time load rate of the motor and ambient temperature; The data processing module is used for calculating the temperature rise rate and the environmental temperature difference of the motor stator and the driving plate based on the acquired data and carrying out normalization processing; The heat accumulation index calculation module is used for calculating a heat accumulation index based on the real-time load rate of the motor, the normalized temperature rise rate and the environment temperature difference; the temperature prediction module is used for calculating the predicted temperatures of the motor stator and the driving plate based on the real-time temperatures and the temperature rise rates of the motor stator and the driving plate; the control decision module is used for executing a hierarchical cooling control decision according to the predicted temperature, the real-time temperature, the heat accumulation index and the preset threshold value of the motor stator and the driving plate.
10. A computer-readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the steps of a magnetic suspension centrifugal compressor electromagnetic valve control method based on multi-parameter fusion prediction as claimed in any one of claims 1-7.

Description

Electromagnetic valve control method, system and medium for magnetic suspension centrifugal compressor Technical Field The invention relates to the technical field of compressor thermal management, in particular to a method, a system and a medium for controlling an electromagnetic valve of a magnetic suspension centrifugal compressor. Background The magnetic suspension centrifugal compressor is widely applied to Heating Ventilation Air Conditioning (HVAC) systems in the fields of large commercial buildings, data centers and the like due to the advantages of high efficiency, oil free, low noise and the like. The high speed motor and drive controller thereof generate a large amount of heat during operation. In order to ensure the safe and stable operation of the equipment, the cooling is performed by adopting a refrigerant bypass circulation mode, and the opening and closing of the circulation passage are precisely controlled by the electromagnetic valve. Currently, the main solenoid valve control strategies in the industry include: 1. And (3) single-temperature threshold control, namely opening the electromagnetic valve when the temperature of a certain key component (such as a motor stator) is monitored to exceed a preset upper limit, and closing the electromagnetic valve when the temperature is lower than a lower limit. The method is simple and direct, but the phenomenon of 'shake' is easy to generate near the temperature critical point, so that the electromagnetic valve is frequently opened and closed, and the mechanical and electrical service life of the electromagnetic valve is seriously shortened. 2. The hysteresis comparison control is to introduce a hysteresis or hysteresis interval for solving the jitter problem, namely, different upper limit of opening temperature and lower limit of closing temperature are set, and although the switching times are reduced to a certain extent, the hysteresis comparison control is still a passive response mechanism in nature, and for working conditions such as rapid increase of load and the like, response is delayed, so that instantaneous local overheating can be caused. 3. Timing control or PID control (proportional-integral-derivative control), which cannot adapt to the changed working condition and is easy to cause undercooling or insufficient heat dissipation. While the PID control can realize smoother adjustment, the parameter setting is complex, the current error is mainly focused, and the prediction capability of future temperature change trend caused by external factors such as load rate, environment temperature and the like is insufficient. As mentioned above, the general lack of comprehensive assessment and predictive prediction capabilities of the thermal state of the compressor system in the prior art results in control strategies that are either too simple and rough, or too complex and poorly adapted to achieve an optimal balance among heat dissipation, equipment life and system energy efficiency. Therefore, there is a need to develop a solenoid valve control method that can integrate multi-source information, predict temperature trend and make intelligent decisions. Disclosure of Invention In order to overcome the defects in the prior art, the invention provides a method, a system and a medium for controlling an electromagnetic valve of a magnetic suspension centrifugal compressor, and aims to solve the problems of frequent switching, control lag, poor adaptability and the like in an electromagnetic valve control strategy in the prior art. The technical scheme adopted for solving the technical problems is that the electromagnetic valve control method of the magnetic suspension centrifugal compressor based on multi-parameter fusion prediction comprises the following steps: collecting data of real-time temperature, real-time load rate and environment temperature of a motor stator and a driving plate; Calculating the temperature rise rate and the environmental temperature difference of the motor stator and the driving plate based on the acquired data, and carrying out normalization processing; calculating a heat accumulation index based on the real-time load rate of the motor, the normalized temperature rise rate and the environment temperature difference; Calculating predicted temperatures of the motor stator and the driving plate based on the real-time temperatures and the temperature rise rates of the motor stator and the driving plate; And executing a hierarchical cooling control decision according to the predicted temperature, the real-time temperature, the heat accumulation index and the preset threshold value of the motor stator and the driving plate. As a further improvement of the invention, the temperature rise rate of the motor stator is as follows: ; The temperature rise rate of the driving plate is as follows: ; Wherein, T m (T) is the real-time temperature of the motor stator at the time T, T m (T- Δt) is the real-time temperature of the moto