A control method, apparatus, air conditioning system, and storage medium for an air conditioning system.

Abstract

This invention discloses a control method, device, air conditioning system, and storage medium for an air conditioning system. The air conditioning system includes a magnetic levitation compressor unit, which comprises one or more magnetic levitation compressors. The method includes: after the magnetic levitation compressor unit starts up, if the pressure ratio of the magnetic levitation compressor is greater than or equal to a set pressure ratio, increasing the frequency ramp-up rate of the magnetic levitation compressor; and decreasing the frequency ramp-up rate of the magnetic levitation compressor when its operating frequency is higher than the surge line frequency. This solution, by controlling the frequency ramp-up rate of the magnetic levitation compressor according to its pressure ratio, achieves the effects of avoiding surge in the magnetic levitation compressor, reducing airflow disturbance, and preventing large fluctuations in bearing rotor displacement.

Description

Technical Field

[0001] This invention belongs to the field of compressor control technology, specifically relating to a control method, device, compressor and storage medium for an air conditioning system, and more particularly to a control method, device, magnetic levitation compressor and storage medium for a magnetic levitation compressor in an air conditioning system. Background Technology

[0002] Magnetic levitation bearings are a new type of high-performance bearing that utilizes integrated technologies such as rotor dynamics, mechanics, electrical engineering, control engineering, magnetic materials, testing technology, and digital signal processing. They separate the rotor and bearing stator through a controlled magnetic field, achieving zero mechanical contact. Magnetic levitation compressors can effectively improve energy efficiency in refrigeration units. Variable frequency magnetic levitation compressors have been developed, which automatically match the compressor's operating frequency according to the cooling capacity requirements.

[0003] During normal operation, the rate of change of the control frequency is relatively fine to accurately control the target frequency and optimize the energy efficiency of the magnetic levitation unit. However, in the application of multi-head units (units containing multiple compressors), the compressors start sequentially. After one compressor starts, a pressure difference will exist between the evaporator and condenser. This causes the compressor that starts later to start up with a certain pressure ratio and load frequency. However, the rate of frequency loading is relatively slow (i.e., the compressor speed acceleration is small). As a result, the actual operating frequency remains lower than the surge frequency throughout the frequency increase process, causing prolonged airflow disturbance and strong impact on the magnetic levitation bearing. In severe cases, this can lead to compressor start-up failure.

[0004] The above content is only used to help understand the technical solution of the present invention and does not represent an admission that the above content is prior art. Summary of the Invention

[0005] The purpose of this invention is to provide a control method, device, magnetic levitation compressor, and storage medium for an air conditioning system. This addresses the problem in related solutions where the compressor starts up with a frequency that is applied at a given pressure ratio, but the frequency application rate is relatively slow. This results in the actual operating frequency remaining below the surge frequency throughout the frequency increase process, causing prolonged airflow disturbance and strong impact on the magnetic levitation bearing. In severe cases, this can lead to compressor start-up failure. The invention achieves this by determining whether the compressor's pressure ratio after startup is greater than or equal to a set pressure ratio. If the pressure ratio is greater than or equal to the set pressure ratio, the compressor's frequency increase rate is increased, thereby rapidly raising the compressor's operating frequency above the surge frequency. This prevents compressor surge, reduces the impact of airflow disturbance on the magnetic levitation bearing, and ensures stable compressor startup.

[0006] This invention provides a control method for an air conditioning system, the air conditioning system comprising: a magnetic levitation compressor unit and a heat exchange unit; the magnetic levitation compressor unit comprising: a magnetic levitation compressor, wherein the number of magnetic levitation compressors is one or more; the one or more magnetic levitation compressors share the heat exchange unit; the heat exchange unit comprising: an outdoor heat exchanger and an indoor heat exchanger; the control method for the air conditioning system comprising: after the magnetic levitation compressor unit starts up, for any one of the one or more magnetic levitation compressors, designating that any one magnetic levitation compressor as the first magnetic levitation compressor; obtaining the pressure ratio of the first magnetic levitation compressor; during the start-up process of the magnetic levitation compressor unit, determining whether the pressure ratio of the first magnetic levitation compressor is greater than or equal to a set pressure ratio; if it is determined that the pressure ratio of the first magnetic levitation compressor is greater than or equal to the set pressure ratio, then increasing the frequency of the first magnetic levitation compressor based on a preset frequency ramp rate. The frequency ramp rate is increased to obtain a first increased frequency ramp rate; and the frequency of the first magnetic levitation compressor is controlled to ramp up at the first increased frequency ramp rate so that the frequency of the first magnetic levitation compressor rises to above a preset surge frequency of the first magnetic levitation compressor; during the start-up process of the magnetic levitation compressor unit, if the frequency of the first magnetic levitation compressor has risen to above the preset surge frequency of the first magnetic levitation compressor, or after the magnetic levitation compressor unit has started up, the frequency ramp rate of the first magnetic levitation compressor is reduced to obtain a first reduced frequency ramp rate; and the frequency of the first magnetic levitation compressor is controlled to ramp up at the first reduced frequency ramp rate so that the frequency of the first magnetic levitation compressor rises to a preset target frequency of the first magnetic levitation compressor; if the frequency of the first magnetic levitation compressor has risen to the preset target frequency of the first magnetic levitation compressor, the first magnetic levitation compressor is controlled to operate at the preset target frequency of the first magnetic levitation compressor.

[0007] In some embodiments, obtaining the pressure ratio of the first magnetic levitation compressor includes: obtaining the exhaust port pressure value and the intake port pressure value of the first magnetic levitation compressor, and using the pressure difference between the exhaust port pressure value and the intake port pressure value of the first magnetic levitation compressor to represent the pressure ratio of the first magnetic levitation compressor; determining whether the pressure ratio of the first magnetic levitation compressor is greater than or equal to a set pressure ratio includes: judging whether the pressure difference between the exhaust port pressure value and the intake port pressure value of the first magnetic levitation compressor is greater than a set pressure threshold; if the pressure difference between the exhaust port pressure value and the intake port pressure value of the first magnetic levitation compressor is greater than the set pressure threshold, then the first magnetic levitation compressor is considered to be... The pressure ratio is greater than or equal to the set pressure ratio; or, the exhaust port temperature value and intake port temperature value of the first magnetic levitation compressor are obtained, and the pressure ratio of the first magnetic levitation compressor is represented by the temperature difference between the exhaust port temperature value and the intake port temperature value; determining whether the pressure ratio of the first magnetic levitation compressor is greater than or equal to the set pressure ratio includes: judging whether the temperature difference between the exhaust port temperature value and the intake port temperature value of the first magnetic levitation compressor is greater than a set temperature threshold; if the temperature difference between the exhaust port temperature value and the intake port temperature value of the first magnetic levitation compressor is greater than the set temperature threshold, then the pressure ratio of the first magnetic levitation compressor is considered to be greater than or equal to the set pressure ratio.

[0008] In some embodiments, increasing the frequency ramp rate of the first magnetic levitation compressor based on its preset ramp rate to obtain a first increased ramp rate includes: increasing a first preset frequency change rate based on the preset ramp rate of the first magnetic levitation compressor to obtain the first increased ramp rate; and / or decreasing the frequency ramp rate of the first magnetic levitation compressor to obtain a first decreased ramp rate includes: decreasing a second preset frequency change rate to obtain the first decreased ramp rate; wherein the first preset frequency change rate is greater than or equal to the second preset frequency change rate.

[0009] In some embodiments, the method further includes: during the operation of the magnetic levitation compressor unit after startup, if the operating conditions and / or load of the magnetic levitation compressor unit have changed, then for any one of the magnetic levitation compressors, that magnetic levitation compressor is designated as the second magnetic levitation compressor; the target frequency of the second magnetic levitation compressor is redefined and designated as the new target frequency of the second magnetic levitation compressor; if the new target frequency of the second magnetic levitation compressor is greater than the preset target frequency of the second magnetic levitation compressor, the frequency ramping rate of the second magnetic levitation compressor is increased based on the preset ramping rate of the second magnetic levitation compressor to obtain a second increased ramping rate; and the frequency of the second magnetic levitation compressor is controlled to ramp up at the second increased ramping rate. The process involves raising the preset target frequency of the second magnetic levitation compressor to a new target frequency; then, controlling the second magnetic levitation compressor to operate at the new target frequency; if the new target frequency of the second magnetic levitation compressor is lower than the preset target frequency, reducing the frequency reduction rate of the second magnetic levitation compressor based on the preset frequency reduction rate to obtain a first reduced frequency reduction rate; and controlling the frequency of the second magnetic levitation compressor to reduce at the first reduced frequency reduction rate to lower the preset target frequency of the second magnetic levitation compressor to the new target frequency; then, controlling the second magnetic levitation compressor to operate at the new target frequency.

[0010] In some embodiments, increasing the frequency ramp rate of the second magnetic levitation compressor based on its preset ramp rate to obtain a second increased ramp rate includes: increasing the third preset frequency change rate based on the preset ramp rate of the second magnetic levitation compressor to obtain the second increased ramp rate; and / or decreasing the frequency reduction rate of the second magnetic levitation compressor based on its preset reduction rate to obtain a first decreased reduction rate includes: decreasing the fourth preset frequency change rate based on the preset reduction rate of the second magnetic levitation compressor to obtain the first decreased reduction rate; wherein the third preset frequency change rate and the fourth preset frequency change rate are both less than or equal to the second preset frequency change rate.

[0011] In conjunction with the above method, another aspect of the present invention provides a control device for an air conditioning system, the air conditioning system comprising: a magnetic levitation compressor unit and a heat exchange unit; the magnetic levitation compressor unit comprising: a magnetic levitation compressor, wherein the number of magnetic levitation compressors is one or more; the one or more magnetic levitation compressors share the heat exchange unit; the heat exchange unit comprising: an outdoor heat exchanger and an indoor heat exchanger; the control device for the air conditioning system comprising: an acquisition unit configured to, after the magnetic levitation compressor unit starts up, designate any one of the magnetic levitation compressors as a first magnetic levitation compressor; acquire the pressure ratio of the first magnetic levitation compressor; a control unit configured to, during the start-up process of the magnetic levitation compressor unit, determine whether the pressure ratio of the first magnetic levitation compressor is greater than or equal to a set pressure ratio; the control unit is further configured to, if it is determined that the pressure ratio of the first magnetic levitation compressor is greater than or equal to the set pressure ratio, increase the first magnetic levitation compressor's frequency based on a preset frequency ramp-up rate. The frequency ramp rate of the magnetic levitation compressor is increased to obtain a first increased ramp rate; and the frequency of the first magnetic levitation compressor is controlled to ramp at the first increased ramp rate so that the frequency of the first magnetic levitation compressor rises to above a preset surge frequency of the first magnetic levitation compressor; the control unit is further configured to, during the startup process of the magnetic levitation compressor unit, if the frequency of the first magnetic levitation compressor has risen to above the preset surge frequency of the first magnetic levitation compressor, or after the magnetic levitation compressor unit has started up, reduce the frequency ramp rate of the first magnetic levitation compressor to obtain a first decreased ramp rate; and control the frequency of the first magnetic levitation compressor to ramp at the first decreased ramp rate so that the frequency of the first magnetic levitation compressor rises to a preset target frequency of the first magnetic levitation compressor; the control unit is further configured to, if the frequency of the first magnetic levitation compressor has risen to the preset target frequency of the first magnetic levitation compressor, control the first magnetic levitation compressor to operate at the preset target frequency of the first magnetic levitation compressor.

[0012] In some embodiments, the acquisition unit acquires the pressure ratio of the first magnetic levitation compressor by: acquiring the exhaust port pressure value and the intake port pressure value of the first magnetic levitation compressor, and using the pressure difference between the exhaust port pressure value and the intake port pressure value of the first magnetic levitation compressor to represent the pressure ratio of the first magnetic levitation compressor; the control unit determines whether the pressure ratio of the first magnetic levitation compressor is greater than or equal to a set pressure ratio by: judging whether the pressure difference between the exhaust port pressure value and the intake port pressure value of the first magnetic levitation compressor is greater than a set pressure threshold; if the pressure difference between the exhaust port pressure value and the intake port pressure value of the first magnetic levitation compressor is greater than the set pressure threshold, then the first magnetic levitation compressor is considered to be in a position ... The compressor's pressure ratio is greater than or equal to a set pressure ratio; or, the exhaust port temperature value and intake port temperature value of the first magnetic levitation compressor are obtained, and the pressure ratio of the first magnetic levitation compressor is represented by the temperature difference between the exhaust port temperature value and the intake port temperature value; the control unit determines whether the pressure ratio of the first magnetic levitation compressor is greater than or equal to the set pressure ratio, including: judging whether the temperature difference between the exhaust port temperature value and the intake port temperature value of the first magnetic levitation compressor is greater than a set temperature threshold; if the temperature difference between the exhaust port temperature value and the intake port temperature value of the first magnetic levitation compressor is greater than the set temperature threshold, then the pressure ratio of the first magnetic levitation compressor is considered to be greater than or equal to the set pressure ratio.

[0013] In some embodiments, the control unit increases the frequency ramp rate of the first magnetic levitation compressor based on the preset ramp rate to obtain a first increased ramp rate, including: increasing a first preset frequency change rate based on the preset ramp rate of the first magnetic levitation compressor to obtain the first increased ramp rate; and / or, the control unit decreases the frequency ramp rate of the first magnetic levitation compressor to obtain a first decreased ramp rate, including: decreasing a second preset frequency change rate to obtain the first decreased ramp rate; wherein, the first preset frequency change rate is greater than or equal to the second preset frequency change rate.

[0014] In some embodiments, the control unit further includes: during the operation of the magnetic levitation compressor unit after startup, if the operating conditions and / or load of the magnetic levitation compressor unit have changed, then for any one of the magnetic levitation compressors, designate that magnetic levitation compressor as the second magnetic levitation compressor; redetermine the target frequency of the second magnetic levitation compressor, designating it as the new target frequency of the second magnetic levitation compressor; if the new target frequency of the second magnetic levitation compressor is greater than the preset target frequency of the second magnetic levitation compressor, increase the frequency ramp rate of the second magnetic levitation compressor based on the preset ramp rate of the second magnetic levitation compressor to obtain a second increased ramp rate; and control the frequency of the second magnetic levitation compressor to operate at the second increased ramp rate. The frequency is increased to raise the preset target frequency of the second magnetic levitation compressor to a new target frequency; then, the second magnetic levitation compressor is controlled to operate at the new target frequency; if the new target frequency of the second magnetic levitation compressor is less than the preset target frequency, the frequency reduction rate of the second magnetic levitation compressor is reduced based on the preset frequency reduction rate of the second magnetic levitation compressor to obtain a first reduced frequency reduction rate; and the frequency of the second magnetic levitation compressor is controlled to be reduced at the first reduced frequency reduction rate to lower the preset target frequency of the second magnetic levitation compressor to the new target frequency; then, the second magnetic levitation compressor is controlled to operate at the new target frequency.

[0015] In some embodiments, the control unit increases the frequency ramp rate of the second magnetic levitation compressor based on the preset ramp rate to obtain a second increased ramp rate, including: increasing the third preset frequency change rate based on the preset ramp rate of the second magnetic levitation compressor to obtain the second increased ramp rate; and / or, the control unit decreases the frequency reduction rate of the second magnetic levitation compressor based on the preset reduction rate to obtain a first decreased reduction rate, including: decreasing the fourth preset frequency change rate based on the preset reduction rate of the second magnetic levitation compressor to obtain the first decreased reduction rate; wherein the third preset frequency change rate and the fourth preset frequency change rate are both less than or equal to the second preset frequency change rate.

[0016] In conjunction with the above-described device, the present invention further provides an air conditioning system, comprising: the control device for the air conditioning system described above.

[0017] In conjunction with the above method, the present invention further provides a storage medium comprising a stored program, wherein, when the program is executed, the device on which the storage medium is located controls the execution of the control method of the air conditioning system described above.

[0018] The present invention addresses this issue by determining whether the pressure ratio of the magnetic levitation compressor is greater than or equal to a set pressure ratio after the compressor unit starts up. If it is, the compressor's boost frequency is increased, and the compressor is controlled to boost at the increased frequency. If the compressor's operating frequency is higher than the surge frequency, the boost frequency is decreased, and the compressor is controlled to boost at the decreased frequency. If the compressor's operating frequency reaches a preset target frequency, it is controlled to operate at the target frequency. Thus, by controlling the compressor's boost frequency through its pressure ratio and operating frequency, the invention avoids surge during boosting, reduces the impact of airflow disturbance, and prevents large fluctuations in bearing rotor displacement. Simultaneously, it achieves precise frequency control during compressor operation after startup, optimizing the energy efficiency of the magnetic levitation unit.

[0019] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention.

[0020] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a compressor unit where the compressors start sequentially and the resulting pressure ratio occurs.

[0022] Figure 2 This is a schematic diagram of the airflow disturbance in the pneumatic components of the compressor when the compressor starts under a pressure ratio.

[0023] Figure 3 This is a flowchart illustrating an embodiment of the control method for an air conditioning system according to the present invention;

[0024] Figure 4 This is a flowchart illustrating an embodiment of the method of the present invention for controlling the magnetic levitation compressor when the operating conditions or load of the magnetic levitation compressor unit change;

[0025] Figure 5 This is a schematic diagram of the structure of an embodiment of the control device for the air conditioning system of the present invention;

[0026] Figure 6 This is a structural block diagram of an embodiment of the control device for the air conditioning system of the present invention;

[0027] Figure 7 This is a schematic diagram of the hardware circuit structure of an embodiment of the control device for the air conditioning system of the present invention;

[0028] Figure 8 This is a flowchart illustrating an embodiment of the control method for a magnetic levitation compressor in an air conditioning system according to the present invention.

[0029] Referring to the accompanying drawings, the reference numerals in the embodiments of the present invention are as follows:

[0030] 102 - Acquisition unit; 104 - Control unit. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0032] Figure 1 This is a schematic diagram of a compressor unit where the compressors start sequentially, resulting in varying pressure ratios. Figure 1 As shown, this compressor unit is a multi-head compressor unit, including compressor one and compressor two, which are arranged in parallel between a condenser and an evaporator. When compressor one starts and begins to work, there will be pressure changes in the condenser and evaporator. The condenser end will become the high-pressure side, and the evaporator end will become the low-pressure side, resulting in a pressure difference between the suction port and the discharge port of compressor two (i.e., a pressure ratio state). If compressor two starts later, it will be in a loaded start-up state. In this state, the rate of frequency loading after compressor two starts is relatively slow. This will cause the actual operating frequency of compressor two to remain below the surge line frequency throughout the frequency increase process. When the operating frequency is below the surge line frequency, compressor two is likely to experience surge.

[0033] Figure 2 This is a schematic diagram showing the airflow disturbance in the compressor's pneumatic components when the compressor starts under a pressure ratio condition, as shown below. Figure 2 As shown, when a compressor experiences surge, the gas that should have been discharged from the exhaust port flows back into the compressor, causing airflow disturbance. Prolonged airflow disturbance can severely impact the compressor's magnetic bearings, potentially leading to compressor startup failure in severe cases.

[0034] Considering the high operational precision of magnetic levitation compressors, it is necessary to ensure the reliability of compressor operation in real time and minimize disturbances during compressor startup. Therefore, this invention proposes a control method for an air conditioning system. After the magnetic levitation compressor starts, based on the pressure difference between the compressor's intake and exhaust ports and a threshold value, it determines whether to increase the compressor's frequency ramp-up rate. This rapidly increases the compressor's speed, preventing surge during frequency ramp-up, reducing disturbances to the compressor rotor, and preventing large fluctuations in bearing rotor displacement during compressor startup.

[0035] According to an embodiment of the present invention, a control method for an air conditioning system is provided. The air conditioning system, such as a refrigeration unit, includes: a magnetic levitation compressor unit and a heat exchange unit; the magnetic levitation compressor unit includes: a magnetic levitation compressor, and the number of magnetic levitation compressors is one or more; one or more magnetic levitation compressors share the heat exchange unit, specifically, they share a single set of heat exchange units; the heat exchange unit includes: an outdoor heat exchanger and an indoor heat exchanger, i.e., a condenser and an evaporator; for example: in a refrigeration unit, in a multi-head unit, the multi-head unit shares a single set of condenser and evaporator; in the case of two magnetic levitation compressors in a multi-head unit, the two magnetic levitation compressors are arranged in parallel between a single set of condenser and evaporator. Figure 3 The diagram shows a flowchart of an embodiment of the method of the present invention. The control method of the air conditioning system may include steps S110 to S150.

[0036] In step S110, after the magnetic levitation compressor unit starts up, for any one of the magnetic levitation compressors, this magnetic levitation compressor is designated as the first magnetic levitation compressor; the pressure ratio of the first magnetic levitation compressor is obtained.

[0037] In step S120, during the startup process of the magnetic levitation compressor unit, it is determined whether the pressure ratio of the first magnetic levitation compressor is greater than or equal to the set pressure ratio.

[0038] In step S130, during the startup process of the magnetic levitation compressor unit, if it is determined that the pressure ratio of the first magnetic levitation compressor is greater than or equal to the set pressure ratio, then based on the preset frequency ramp rate of the first magnetic levitation compressor, the frequency ramp rate of the first magnetic levitation compressor is increased to obtain a first increased frequency ramp rate; and the frequency of the first magnetic levitation compressor is controlled to ramp at the first increased frequency ramp rate so that the frequency of the first magnetic levitation compressor rises above the preset surge frequency of the first magnetic levitation compressor. By increasing the frequency ramp rate of the first magnetic levitation compressor, the rotational speed of the first magnetic levitation compressor is increased more quickly, and the impact of airflow disturbance on the magnetic levitation bearing is reduced by rapidly increasing the compressor speed. Of course, if it is determined that the pressure ratio of the first magnetic levitation compressor is less than the set pressure ratio, then the frequency of the first magnetic levitation compressor is controlled to ramp at the preset frequency ramp rate.

[0039] In step S140, during the startup of the magnetic levitation compressor unit, if the frequency of the first magnetic levitation compressor has increased to above the preset surge frequency of the first magnetic levitation compressor, or after the magnetic levitation compressor unit has started, based on the first increased frequency increase rate, the frequency increase rate of the first magnetic levitation compressor is reduced to obtain a first reduced frequency increase rate; and the frequency of the first magnetic levitation compressor is controlled to increase at the first reduced frequency increase rate so that the frequency of the first magnetic levitation compressor increases to the preset target frequency of the first magnetic levitation compressor. By slowing down the frequency increase rate of the first magnetic levitation compressor, the first magnetic levitation compressor is made to smoothly increase to the preset target frequency of the first magnetic levitation compressor.

[0040] In step S150, during the startup of the magnetic levitation compressor unit, if the frequency of the first magnetic levitation compressor has increased to above the preset surge frequency of the first magnetic levitation compressor, or after the magnetic levitation compressor unit has started up, if the frequency of the first magnetic levitation compressor has increased to the preset target frequency of the first magnetic levitation compressor, then the first magnetic levitation compressor is controlled to operate at the preset target frequency of the first magnetic levitation compressor.

[0041] The present invention addresses this issue by determining whether to increase the frequency increase rate during the start-up and frequency rise process of the magnetic levitation compressor unit after startup, based on the magnitude of the compressor's pressure ratio and the set pressure ratio. When the operating frequency of the magnetic levitation compressor is higher than the surge frequency or reaches the set frequency, the frequency rise rate is reduced. This avoids the problem of the magnetic levitation compressor operating at a frequency lower than the surge frequency during the frequency rise process, which could cause airflow disturbances, resulting in strong impacts on the magnetic bearings and severely affecting the stability of the compressor during startup. Simultaneously, this invention achieves precise control of frequency changes, optimizing the energy efficiency of the magnetic levitation unit.

[0042] In some implementations, in step S110, the pressure ratio of the first magnetic levitation compressor is obtained, including any of the following methods:

[0043] The first method of obtaining the pressure is to obtain the exhaust port pressure value and the intake port pressure value of the first magnetic levitation compressor, and use the pressure difference between the exhaust port pressure value and the intake port pressure value of the first magnetic levitation compressor to represent the pressure ratio of the first magnetic levitation compressor.

[0044] Accordingly, in step S120, determining whether the pressure ratio of the first magnetic levitation compressor is greater than or equal to the set pressure ratio includes:

[0045] Determine whether the pressure difference between the exhaust port pressure and the intake port pressure of the first magnetic levitation compressor is greater than a set pressure threshold.

[0046] If the pressure difference between the exhaust port pressure and the intake port pressure of the first magnetic levitation compressor is greater than a set pressure threshold, then the pressure ratio of the first magnetic levitation compressor is considered to be greater than or equal to the set pressure ratio; or,

[0047] The second method of obtaining the temperature is to obtain the exhaust port temperature and intake port temperature of the first magnetic levitation compressor, and use the temperature difference between the exhaust port temperature and intake port temperature of the first magnetic levitation compressor to represent the pressure ratio of the first magnetic levitation compressor.

[0048] Accordingly, in step S120, determining whether the pressure ratio of the first magnetic levitation compressor is greater than or equal to the set pressure ratio includes:

[0049] Determine whether the temperature difference between the exhaust port temperature and the intake port temperature of the first magnetic levitation compressor is greater than a set temperature threshold.

[0050] If the temperature difference between the exhaust port temperature and the intake port temperature of the first magnetic levitation compressor is greater than the set temperature threshold, then the pressure ratio of the first magnetic levitation compressor is considered to be greater than or equal to the set pressure ratio.

[0051] By determining the relationship between the current pressure ratio and the set pressure ratio based on the exhaust and intake temperatures of the magnetic levitation compressor, or vice versa, it can be determined whether the magnetic levitation compressor is likely to surge. Based on this, the operating frequency of the magnetic levitation compressor can be adjusted to avoid the impact of airflow disturbance on the magnetic levitation bearing, prevent large fluctuations in bearing rotor displacement during startup, and improve the reliability of the magnetic levitation compressor during frequency ramp-up.

[0052] In some embodiments, in step S130, based on the preset frequency ramp rate of the first magnetic levitation compressor, the frequency ramp rate of the first magnetic levitation compressor is increased to obtain a first increased frequency ramp rate, including:

[0053] Based on the preset frequency increase rate of the first magnetic levitation compressor, the first preset frequency change rate is increased to obtain the first increased frequency increase rate.

[0054] In step S140, based on the first increased frequency ramp rate, the frequency ramp rate of the first magnetic levitation compressor is reduced to obtain a first reduced frequency ramp rate, including:

[0055] Based on the first increase in frequency ramp rate, the second preset frequency change rate is reduced to obtain the first decrease in frequency ramp rate; specifically, during the frequency ramping process of the first magnetic levitation compression, the current operating frequency of the first magnetic levitation compression is detected; it is determined whether the current operating frequency of the first magnetic levitation compression reaches the preset surge frequency of the first magnetic levitation compression; if the current operating frequency of the first magnetic levitation compression does not reach the preset surge frequency of the first magnetic levitation compression, the first magnetic levitation compression is controlled to continue ramping at the current frequency ramp rate; if the current operating frequency of the first magnetic levitation compression has reached the preset surge frequency of the first magnetic levitation compression, the second preset frequency change rate is reduced at the current frequency ramp rate of the first magnetic levitation compression, and the first magnetic levitation compression is controlled to ramp at the reduced frequency ramp rate.

[0056] Wherein, the first preset frequency change rate is greater than or equal to the second preset frequency change rate.

[0057] Specifically, Figure 8 This is a flowchart illustrating an embodiment of the control method for a magnetic levitation compressor in an air conditioning system according to the present invention, as shown below. Figure 8 As shown, the control method for the magnetic levitation compressor in the air conditioning system of the present invention includes:

[0058] Step 1: After the magnetic levitation compressor is started, it begins to increase the frequency. During the frequency increase process, it is determined whether the pressure difference between the exhaust port pressure value and the intake port pressure value of the magnetic levitation compressor is greater than the set threshold P. If it is greater, proceed to step 2; otherwise, proceed to step 3.

[0059] Optionally, the temperature values ​​at the exhaust port and intake port of the magnetic levitation compressor can also be used for judgment. In this case, step 1 can also be set as follows: after the magnetic levitation compressor is started, it begins to increase the frequency. During the frequency increase process, it is determined whether the temperature difference between the exhaust port temperature value and the intake port temperature value of the magnetic levitation compressor is greater than the set temperature threshold. If it is greater, step 2 is executed; otherwise, step 3 is executed.

[0060] Step 2, increase the current frequency ramp rate of the magnetic levitation compressor by ΔF. 加 The increased frequency change rate is used as the current frequency ramp rate of the magnetic levitation compressor, and then step 3 is executed.

[0061] Step 3: The magnetic levitation compressor increases its frequency according to the current frequency increase rate, and determines whether the current operating frequency of the magnetic levitation compressor has reached the set operating frequency F. 设 If the condition is met, proceed to step 4; otherwise, re-execute step 3.

[0062] Step 4: Reduce the current frequency ramp rate of the magnetic levitation compressor by ΔF. 减 The reduced frequency change rate is used as the current frequency ramp-up rate of the magnetic levitation compressor, and the magnetic levitation compressor ramps up its frequency according to the current frequency ramp-up rate.

[0063] Specifically, △F 加 The range can be from 0.1Hz / s to 25Hz / s, and can be set according to requirements. The surge line frequency requirement can reach 100Hz. The frequency ramp-up rate of ordinary units is 5Hz / s, and it takes 20 seconds to reach 100Hz / s. During these 20 seconds, the operating frequency is lower than the surge line, resulting in prolonged surge of the unit and significant damage. When ΔF 加 When the frequency is set to 25Hz / s, the current frequency is 5 + 25 = 30Hz / s. Increasing it to 100Hz / s only takes 3.3 seconds, significantly shortening the surge time. When the operating frequency reaches above the surge line, it can be reduced to 5Hz / s or below to achieve precise temperature control in inverter air conditioners, reducing the rate of change, preventing temperature control overshoot, and preventing large temperature fluctuations. Specifically, △F 加 It can be set to 0.1Hz / s≤△F 加 ≤25Hz / s, and the current upsampling rate + ΔF 加 ≤30Hz / s; can also be set to ΔF 加 ≤△F 减The current upsampling rate, whether increased or decreased, ensures that the frequency change rate varies between 0.1 Hz / s and 30 Hz / s.

[0064] Figure 6 This is a structural block diagram of an embodiment of the control device for the air conditioning system of the present invention, as shown below. Figure 6 As shown, the control method for the air conditioning system of the present invention includes an intake and exhaust port pressure sensor, a controller, a frequency converter, and a compressor. The intake and exhaust port pressure sensor transmits the collected compressor intake and exhaust port pressure values ​​to the controller; the controller can control the frequency converter, thereby controlling the compressor frequency; the frequency converter can not only feed back the compressor frequency to the controller, but also control the compressor frequency.

[0065] exist Figure 8 In step 3, when the magnetic levitation compressor increases its frequency according to the rate of increase obtained in step 2, the controller sends an increase frequency change rate command and a frequency increase command to the inverter. The frequency increase command controls the magnetic levitation compressor to increase its frequency according to the increased rate of increase. The inverter executes these two commands to control the compressor's frequency to increase relatively quickly, allowing the compressor speed to rise rapidly, effectively preventing surge during compressor startup and reducing the impact of airflow disturbance signals on the magnetic levitation bearing. Correspondingly, in Figure 8 In step 4, when the magnetic levitation compressor increases the frequency according to the reduced rate of frequency increase, the controller sends a command to the frequency converter to reduce the rate of frequency change, and the frequency converter executes the command to reduce the rate of frequency change. The controller sends the required target frequency signal adjustment command to the frequency converter according to the actual load of the unit, and the frequency converter performs fine frequency control to slowly transition to the target frequency, and the unit operates normally.

[0066] Figure 7 This is a schematic diagram of the hardware circuit structure of an embodiment of the control device for the air conditioning system of the present invention, as shown below. Figure 7 As shown, after the intake and exhaust port pressure sensors collect the intake and exhaust port pressure values ​​of the magnetic levitation compressor, they can use these values ​​as input values ​​to the operational amplifier for subtraction to obtain the pressure difference. After outputting the pressure difference to the controller, the controller can control the frequency ramp-up or ramp-down rate of the magnetic levitation compressor based on the pressure difference and a set threshold value.

[0067] The solution of this invention not only increases the frequency ramp rate during the frequency ramping process of the magnetic levitation compressor to prevent airflow disturbance in the magnetic levitation compressor, but also achieves the effect of fine control of frequency change by reducing the frequency ramp rate or reducing the frequency change rate during the stable operation phase when the operating frequency of the levitation compressor is higher than the surge line frequency. This allows the operating frequency of the magnetic levitation compressor to slowly transition to the target frequency, thereby optimizing the energy efficiency of the magnetic levitation unit.

[0068] Figure 4 This is a flowchart illustrating an embodiment of the method of the present invention for controlling the magnetic levitation compressor when the operating conditions or load of the magnetic levitation compressor unit change. In some embodiments, such as... Figure 4 As shown, the control method of the air conditioning system of the present invention further includes steps S210 to S230.

[0069] Step S210: During the operation of the magnetic levitation compressor unit after startup, if the operating conditions and / or load of the magnetic levitation compressor unit have changed, then for any one of the magnetic levitation compressors, this any one is designated as the second magnetic levitation compressor; the target frequency of the second magnetic levitation compressor is redefined and designated as the new target frequency of the second magnetic levitation compressor. For example, if the evaporation temperature of the magnetic levitation compressor unit is 10 degrees Celsius and the condensation temperature is 25 degrees Celsius during operation, it can be marked as starting under operating condition 1, using the corresponding frequency increase / decrease rate 1; if the evaporation temperature of the magnetic levitation compressor unit is 15 degrees Celsius and the condensation temperature is 25 degrees Celsius during operation, it can be marked as starting under operating condition 2, using the corresponding frequency increase / decrease rate 2. Alternatively, the percentage of the compressor input current to the rated current during operation can be used as the load, and the corresponding frequency increase / decrease rate can be adopted based on this percentage.

[0070] Step S220: When the target frequency of the new second magnetic levitation compressor is greater than the preset target frequency of the second magnetic levitation compressor, the frequency ramping rate of the second magnetic levitation compressor is increased based on the preset ramping rate of the second magnetic levitation compressor to obtain a second increased ramping rate; and the frequency of the second magnetic levitation compressor is controlled to ramp up at the second increased ramping rate so that the preset target frequency of the second magnetic levitation compressor is raised to the target frequency of the new second magnetic levitation compressor; then, the second magnetic levitation compressor is controlled to operate at the new target frequency of the second magnetic levitation compressor.

[0071] Step S230: When the target frequency of the new second magnetic levitation compressor is less than the preset target frequency of the second magnetic levitation compressor, the frequency reduction rate of the second magnetic levitation compressor is reduced based on the preset frequency reduction rate of the second magnetic levitation compressor to obtain a first reduced frequency reduction rate; and the frequency of the second magnetic levitation compressor is controlled to be reduced at the first reduced frequency reduction rate so that the preset target frequency of the second magnetic levitation compressor is reduced to the new target frequency of the second magnetic levitation compressor; then, the second magnetic levitation compressor is controlled to operate at the new target frequency of the second magnetic levitation compressor.

[0072] For compressors, the surge frequency changes depending on the compressor's operating conditions or load. Therefore, when the operating conditions or load of the magnetic levitation compressor unit change, the corresponding surge frequency will also change. The surge frequency may be higher than the current operating frequency. Therefore, when the operating conditions or load change, redetermining the target frequency of the magnetic levitation compressor and controlling the compressor frequency can effectively prevent surge during the operation of the magnetic levitation compressor, thereby reducing the airflow disturbance received by the rotor and ensuring the reliability of the magnetic levitation compressor throughout the entire operation.

[0073] In some embodiments, in step S220, based on the preset frequency ramp rate of the second magnetic levitation compressor, the frequency ramp rate of the second magnetic levitation compressor is increased to obtain a second increased frequency ramp rate, including:

[0074] Based on the preset frequency increase rate of the second magnetic levitation compressor, the third preset frequency change rate is increased to obtain the second increased frequency increase rate.

[0075] In step S230, based on the preset frequency reduction rate of the second magnetic levitation compressor, the frequency reduction rate of the second magnetic levitation compressor is reduced to obtain a first reduced frequency reduction rate, including:

[0076] Based on the preset frequency reduction rate of the second magnetic levitation compressor, the fourth preset frequency change rate is reduced to obtain the first reduced frequency reduction rate.

[0077] Wherein, the third preset frequency change rate and the fourth preset frequency change rate are both less than or equal to the second preset frequency change rate.

[0078] Variable frequency air conditioners are characterized by compressor frequency variations depending on operating conditions. This is a common feature and an inherent characteristic of variable frequency air conditioners. The solution presented in this invention, compared to methods that only adjust the compressor motor speed, can more quickly raise the operating frequency above the surge line. By adjusting the rate of frequency change, it addresses issues such as long surge time and temperature control overshoot. For example, using a speed adjustment method for surge control takes 20 seconds, and the compressor itself is in an unstable state during the adjustment process. This solution, however, only requires 3.3 seconds, or even eliminates surge altogether, significantly improving reliability.

[0079] The solution of this invention is applicable not only to the start-up phase of magnetic levitation compressors with pressure ratios, but also to anti-surge control across the entire operating frequency range. When the unit determines that a surge has occurred and the frequency needs to be increased, the frequency change rate is increased first, and then the frequency is increased. This allows the target frequency to be reached quickly, effectively shortening the compressor surge time and reducing the airflow disturbance impact on the magnetic levitation bearing. It is applicable not only to units with multiple compressors but also to units with a single compressor.

[0080] The technical solution of this embodiment determines whether the pressure ratio of the magnetic levitation compressor is greater than or equal to the set pressure ratio after the magnetic levitation compressor unit starts up. If it is, the frequency ramp-up of the magnetic levitation compressor is increased, and the compressor is controlled to ramp up at the increased frequency. If the operating frequency of the magnetic levitation compressor is higher than the surge frequency, the frequency ramp-up is decreased, and the compressor is controlled to ramp up at the decreased frequency. If the operating frequency reaches the preset target frequency, the compressor is controlled to operate at the target frequency. Thus, by controlling the pressure ratio and operating frequency of the magnetic levitation compressor, the frequency ramp-up of the compressor is controlled, preventing surge during the frequency ramp-up process, reducing the impact of airflow disturbance, and preventing large fluctuations in bearing rotor displacement. Simultaneously, during the compressor's operation after startup, precise frequency control is achieved, optimizing the energy efficiency of the magnetic levitation unit.

[0081] According to embodiments of the present invention, a control device for an air conditioning system corresponding to a control method for an air conditioning system is also provided. The air conditioning system, such as a refrigeration unit, includes: a magnetic levitation compressor unit and a heat exchange unit; the magnetic levitation compressor unit includes: a magnetic levitation compressor, and the number of magnetic levitation compressors is one or more; one or more magnetic levitation compressors share the heat exchange unit, specifically sharing one set of the heat exchange unit; the heat exchange unit includes: an outdoor heat exchanger and an indoor heat exchanger, i.e., a condenser and an evaporator; for example: in a refrigeration unit, in a multi-head unit, the multi-head unit shares one set of condenser and evaporator; in the case of two magnetic levitation compressors in a multi-head unit, the two magnetic levitation compressors are arranged in parallel between one set of condenser and evaporator. See also Figure 5 The diagram shows a structural schematic of an embodiment of the device of the present invention. The control device of the air conditioning system may include: an acquisition unit 102 and a control unit 104.

[0082] The acquisition unit 102 is configured to, after the magnetic levitation compressor unit starts up, for any one of the magnetic levitation compressors, designate any one of the magnetic levitation compressors as the first magnetic levitation compressor; and acquire the pressure ratio of the first magnetic levitation compressor; the specific function of the acquisition unit 102, i.e. the processing, is described in step S110.

[0083] The control unit 104 is configured to determine whether the pressure ratio of the first magnetic levitation compressor is greater than or equal to a set pressure ratio during the startup process of the magnetic levitation compressor unit; the specific function of the control unit 104, i.e. the processing, is described in step S120.

[0084] The control unit 104 is further configured to, during the startup process of the magnetic levitation compressor unit, if it is determined that the pressure ratio of the first magnetic levitation compressor is greater than or equal to the set pressure ratio, increase the frequency ramp rate of the first magnetic levitation compressor based on the preset ramp rate of the first magnetic levitation compressor to obtain a first increased ramp rate; and control the frequency of the first magnetic levitation compressor to ramp at the first increased ramp rate so that the frequency of the first magnetic levitation compressor rises above the preset surge frequency of the first magnetic levitation compressor. By increasing the frequency ramp rate of the first magnetic levitation compressor, the rotational speed of the first magnetic levitation compressor is increased more quickly, thereby reducing the impact of airflow disturbance on the magnetic levitation bearing. Of course, if it is determined that the pressure ratio of the first magnetic levitation compressor is less than the set pressure ratio, the frequency of the first magnetic levitation compressor is controlled to ramp at the preset ramp rate. The specific function of this control unit 104, i.e., the processing, is described in step S130.

[0085] The control unit 104 is further configured to, during the startup process of the magnetic levitation compressor unit, if the frequency of the first magnetic levitation compressor has increased to above a preset surge frequency of the first magnetic levitation compressor, or after the magnetic levitation compressor unit has started, reduce the frequency increase rate of the first magnetic levitation compressor based on the first increased frequency increase rate to obtain a first reduced frequency increase rate; and control the frequency of the first magnetic levitation compressor to increase at the first reduced frequency increase rate so that the frequency of the first magnetic levitation compressor increases to a preset target frequency of the first magnetic levitation compressor. By slowing down the frequency increase rate of the first magnetic levitation compressor, the first magnetic levitation compressor can smoothly increase its frequency to the preset target frequency of the first magnetic levitation compressor. The specific function of this control unit 104, i.e., the processing, is described in step S140.

[0086] The control unit 104 is further configured to, during the startup process of the magnetic levitation compressor unit, if the frequency of the first magnetic levitation compressor has increased to above a preset surge frequency of the first magnetic levitation compressor, or after the magnetic levitation compressor unit has started up, if the frequency of the first magnetic levitation compressor has increased to a preset target frequency of the first magnetic levitation compressor, then control the first magnetic levitation compressor to operate at the preset target frequency of the first magnetic levitation compressor. The specific function of this control unit 104, i.e., the processing, is described in step S150.

[0087] The solution of this invention, after the magnetic levitation compressor unit starts, determines whether to increase the frequency increase rate based on the magnitude of the pressure ratio of the magnetic levitation compressor and the set pressure ratio during the start-up frequency increase process of the magnetic levitation compressor; when the operating frequency of the magnetic levitation compressor is higher than the surge frequency or reaches the set frequency, the frequency increase rate is reduced, thereby avoiding the problem that the operating frequency of the magnetic levitation compressor is lower than the surge frequency during the frequency increase process, which would cause airflow disturbance in the magnetic levitation compressor, resulting in strong impact on the magnetic levitation bearing and seriously affecting the stability of the magnetic levitation compressor during startup.

[0088] In some embodiments, the acquisition unit 102 acquires the pressure ratio of the first magnetic levitation compressor, including any of the following acquisition methods:

[0089] The first acquisition method: The acquisition unit 102 is further configured to acquire the exhaust port pressure value and the intake port pressure value of the first magnetic levitation compressor, and use the pressure difference between the exhaust port pressure value and the intake port pressure value of the first magnetic levitation compressor to represent the pressure ratio of the first magnetic levitation compressor.

[0090] Accordingly, the control unit 104 determines whether the pressure ratio of the first magnetic levitation compressor is greater than or equal to a set pressure ratio, including:

[0091] Determine whether the pressure difference between the exhaust port pressure and the intake port pressure of the first magnetic levitation compressor is greater than a set pressure threshold.

[0092] If the pressure difference between the exhaust port pressure and the intake port pressure of the first magnetic levitation compressor is greater than the set pressure threshold, then the pressure ratio of the first magnetic levitation compressor is considered to be greater than or equal to the set pressure ratio.

[0093] The second acquisition method: The acquisition unit 102 is further configured to acquire the exhaust port temperature value and the intake port temperature value of the first magnetic levitation compressor, and use the temperature difference between the exhaust port temperature value and the intake port temperature value of the first magnetic levitation compressor to represent the pressure ratio of the first magnetic levitation compressor.

[0094] Accordingly, the control unit 104 determines whether the pressure ratio of the first magnetic levitation compressor is greater than or equal to a set pressure ratio, including:

[0095] Determine whether the temperature difference between the exhaust port temperature and the intake port temperature of the first magnetic levitation compressor is greater than a set temperature threshold.

[0096] If the temperature difference between the exhaust port temperature and the intake port temperature of the first magnetic levitation compressor is greater than the set temperature threshold, then the pressure ratio of the first magnetic levitation compressor is considered to be greater than or equal to the set pressure ratio.

[0097] By determining the relationship between the current pressure ratio and the set pressure ratio based on the exhaust and intake temperatures of the magnetic levitation compressor, or vice versa, it can be determined whether the magnetic levitation compressor is likely to surge. Based on this, the operating frequency of the magnetic levitation compressor can be adjusted to avoid the impact of airflow disturbance on the magnetic levitation bearing, prevent large fluctuations in bearing rotor displacement during startup, and improve the reliability of the magnetic levitation compressor during frequency ramp-up.

[0098] In some embodiments, the control unit 104, based on the preset frequency ramp rate of the first magnetic levitation compressor, increases the frequency ramp rate of the first magnetic levitation compressor to obtain a first increased frequency ramp rate, including:

[0099] Based on the preset frequency increase rate of the first magnetic levitation compressor, the first preset frequency change rate is increased to obtain the first increased frequency increase rate.

[0100] The control unit 104, based on the first increased frequency ramp rate, reduces the frequency ramp rate of the first magnetic levitation compressor to obtain a first reduced frequency ramp rate, including:

[0101] Based on the first increase in frequency ramp rate, the second preset frequency change rate is reduced to obtain the first decrease in frequency ramp rate; specifically, during the frequency ramping process of the first magnetic levitation compression, the current operating frequency of the first magnetic levitation compression is detected; it is determined whether the current operating frequency of the first magnetic levitation compression reaches the preset surge frequency of the first magnetic levitation compression; if the current operating frequency of the first magnetic levitation compression does not reach the preset surge frequency of the first magnetic levitation compression, the first magnetic levitation compression is controlled to continue ramping at the current frequency ramp rate; if the current operating frequency of the first magnetic levitation compression has reached the preset surge frequency of the first magnetic levitation compression, the second preset frequency change rate is reduced at the current frequency ramp rate of the first magnetic levitation compression, and the first magnetic levitation compression is controlled to ramp at the reduced frequency ramp rate.

[0102] Wherein, the first preset frequency change rate is greater than or equal to the second preset frequency change rate.

[0103] Specifically, Figure 8 This is a flowchart illustrating an embodiment of the control method for a magnetic levitation compressor in an air conditioning system according to the present invention, as shown below. Figure 8 As shown, the control method for the magnetic levitation compressor in the air conditioning system of the present invention includes:

[0104] Step 1: After the magnetic levitation compressor is started, it begins to increase the frequency. During the frequency increase process, it is determined whether the pressure difference between the exhaust port pressure value and the intake port pressure value of the magnetic levitation compressor is greater than the set threshold P. If it is greater, proceed to step 2; otherwise, proceed to step 3.

[0105] Optionally, the temperature values ​​at the exhaust port and intake port of the magnetic levitation compressor can also be used for judgment. In this case, step 1 can also be set as follows: after the magnetic levitation compressor is started, it begins to increase the frequency. During the frequency increase process, it is determined whether the temperature difference between the exhaust port temperature value and the intake port temperature value of the magnetic levitation compressor is greater than the set temperature threshold. If it is greater, step 2 is executed; otherwise, step 3 is executed.

[0106] Step 2, increase the current frequency ramp rate of the magnetic levitation compressor by ΔF. 加 The increased frequency change rate is used as the current frequency ramp rate of the magnetic levitation compressor, and then step 3 is executed.

[0107] Step 3: The magnetic levitation compressor increases its frequency according to the current frequency increase rate, and determines whether the current operating frequency of the magnetic levitation compressor has reached the set operating frequency F. 设 If the condition is met, proceed to step 4; otherwise, re-execute step 3.

[0108] Step 4: Reduce the current frequency ramp rate of the magnetic levitation compressor by ΔF. 减 The reduced frequency change rate is used as the current frequency ramp-up rate of the magnetic levitation compressor, and the magnetic levitation compressor ramps up its frequency according to the current frequency ramp-up rate.

[0109] Specifically, △F 加 The range can be from 0.1Hz / s to 25Hz / s, and can be set according to requirements. The surge line frequency requirement can reach 100Hz. The frequency ramp-up rate of ordinary units is 5Hz / s, and it takes 20 seconds to reach 100Hz / s. During these 20 seconds, the operating frequency is lower than the surge line, resulting in prolonged surge of the unit and significant damage. When ΔF 加 When the frequency is set to 25Hz / s, the current frequency is 5 + 25 = 30Hz / s. Increasing it to 100Hz / s only takes 3.3 seconds, significantly shortening the surge time. When the operating frequency reaches above the surge line, it can be reduced to 5Hz / s or below to achieve precise temperature control in inverter air conditioners, reducing the rate of change, preventing temperature control overshoot, and preventing large temperature fluctuations. Specifically, △F 加 It can be set to 0.1Hz / s≤△F 加 ≤25Hz / s, and the current upsampling rate + ΔF 加 ≤30Hz / s; can also be set to ΔF 加 ≤△F 减The current upsampling rate, whether increased or decreased, ensures that the frequency change rate varies between 0.1 Hz / s and 30 Hz / s.

[0110] Figure 6 This is a structural block diagram of an embodiment of the control device for the air conditioning system of the present invention, as shown below. Figure 6 As shown, the control method for the air conditioning system of the present invention includes an intake and exhaust port pressure sensor, a controller, a frequency converter, and a compressor. The intake and exhaust port pressure sensor transmits the collected compressor intake and exhaust port pressure values ​​to the controller; the controller can control the frequency converter, thereby controlling the compressor frequency; the frequency converter can not only feed back the compressor frequency to the controller, but also control the compressor frequency.

[0111] exist Figure 8 In step 3, when the magnetic levitation compressor increases its frequency according to the rate of increase obtained in step 2, the controller sends an increase frequency change rate command and a frequency increase command to the inverter. The frequency increase command controls the magnetic levitation compressor to increase its frequency according to the increased rate of increase. The inverter executes these two commands to control the compressor's frequency to increase relatively quickly, allowing the compressor speed to rise rapidly, effectively preventing surge during compressor startup and reducing the impact of airflow disturbance signals on the magnetic levitation bearing. Correspondingly, in Figure 8 In step 4, when the magnetic levitation compressor increases the frequency according to the reduced rate of frequency increase, the controller sends a command to the frequency converter to reduce the rate of frequency change, and the frequency converter executes the command to reduce the rate of frequency change. The controller sends the required target frequency signal adjustment command to the frequency converter according to the actual load of the unit, and the frequency converter performs fine frequency control to slowly transition to the target frequency, and the unit operates normally.

[0112] Figure 7 This is a schematic diagram of the hardware circuit structure of an embodiment of the control device for the air conditioning system of the present invention, as shown below. Figure 7 As shown, after the intake and exhaust port pressure sensors collect the intake and exhaust port pressure values ​​of the magnetic levitation compressor, they can use these values ​​as input values ​​to the operational amplifier for subtraction to obtain the pressure difference. After outputting the pressure difference to the controller, the controller can control the frequency ramp-up or ramp-down rate of the magnetic levitation compressor based on the pressure difference and a set threshold value.

[0113] The solution of this invention not only increases the frequency ramp rate during the frequency ramping process of the magnetic levitation compressor to prevent airflow disturbance in the magnetic levitation compressor, but also achieves the effect of fine control of frequency change by reducing the frequency ramp rate or reducing the frequency change rate during the stable operation phase when the operating frequency of the levitation compressor is higher than the surge line frequency. This allows the operating frequency of the magnetic levitation compressor to slowly transition to the target frequency, thereby optimizing the energy efficiency of the magnetic levitation unit.

[0114] In some embodiments, the control unit 104 further includes:

[0115] The control unit 104 is further configured to, during the operation of the magnetic levitation compressor unit after startup, if the operating conditions and / or load of the magnetic levitation compressor unit have changed, designate any one of the magnetic levitation compressors as the second magnetic levitation compressor; and re-determine the target frequency of the second magnetic levitation compressor, designating it as the new target frequency of the second magnetic levitation compressor. For example, if the evaporation temperature of the magnetic levitation compressor unit is 10 degrees Celsius and the condensation temperature is 25 degrees Celsius during operation, it can be marked as starting under operating condition 1, using the corresponding frequency increase / decrease rate 1; if the evaporation temperature of the magnetic levitation compressor unit is 15 degrees Celsius and the condensation temperature is 25 degrees Celsius during operation, it can be marked as starting under operating condition 2, using the corresponding frequency increase / decrease rate 2. Alternatively, the percentage of the compressor input current to the rated current during operation can be used as the load, and the corresponding frequency increase / decrease rate can be used based on this percentage. The specific function of the control unit 104, i.e., the processing, is described in step S210.

[0116] The control unit 104 is further configured to, when the new target frequency of the second magnetic levitation compressor is greater than the preset target frequency of the second magnetic levitation compressor, increase the frequency ramp rate of the second magnetic levitation compressor based on the preset ramp rate of the second magnetic levitation compressor to obtain a second increased ramp rate; and control the frequency of the second magnetic levitation compressor to ramp at the second increased ramp rate so that the preset target frequency of the second magnetic levitation compressor rises to the new target frequency of the second magnetic levitation compressor; then, control the second magnetic levitation compressor to operate at the new target frequency of the second magnetic levitation compressor. The specific function of this control unit 104, i.e., the processing, is described in step S220.

[0117] The control unit 104 is further configured to, when the new target frequency of the second magnetic levitation compressor is less than the preset target frequency of the second magnetic levitation compressor, reduce the frequency reduction rate of the second magnetic levitation compressor based on the preset frequency reduction rate of the second magnetic levitation compressor to obtain a first reduced frequency reduction rate; and control the frequency of the second magnetic levitation compressor to be reduced at the first reduced frequency reduction rate so that the preset target frequency of the second magnetic levitation compressor is reduced to the new target frequency of the second magnetic levitation compressor; then, control the second magnetic levitation compressor to operate at the new target frequency of the second magnetic levitation compressor. The specific function of this control unit 104, i.e., the processing, is described in step S230.

[0118] For compressors, the surge frequency changes depending on the compressor's operating conditions or load. Therefore, when the operating conditions or load of the magnetic levitation compressor unit change, the corresponding surge frequency will also change. The surge frequency may be higher than the current operating frequency. Therefore, when the operating conditions or load change, redetermining the target frequency of the magnetic levitation compressor and controlling the compressor frequency can effectively prevent surge during the operation of the magnetic levitation compressor, thereby reducing the airflow disturbance received by the rotor and ensuring the reliability of the magnetic levitation compressor throughout the entire operation.

[0119] In some embodiments, the control unit 104, based on the preset frequency ramp rate of the second magnetic levitation compressor, increases the frequency ramp rate of the second magnetic levitation compressor to obtain a second increased frequency ramp rate, including:

[0120] Based on the preset frequency increase rate of the second magnetic levitation compressor, the third preset frequency change rate is increased to obtain the second increased frequency increase rate.

[0121] The control unit 104, based on the preset frequency reduction rate of the second magnetic levitation compressor, reduces the frequency reduction rate of the second magnetic levitation compressor to obtain a first frequency reduction rate, including:

[0122] Based on the preset frequency reduction rate of the second magnetic levitation compressor, the fourth preset frequency change rate is reduced to obtain the first reduced frequency reduction rate;

[0123] Wherein, the third preset frequency change rate and the fourth preset frequency change rate are both less than or equal to the second preset frequency change rate.

[0124] Variable frequency air conditioners are characterized by compressor frequency variations depending on operating conditions. This is a common feature and an inherent characteristic of variable frequency air conditioners. The solution presented in this invention, compared to methods that only adjust the compressor motor speed, can more quickly raise the operating frequency above the surge line. By adjusting the rate of frequency change, it addresses issues such as long surge time and temperature control overshoot. For example, using a speed adjustment method for surge control takes 20 seconds, and the compressor itself is in an unstable state during the adjustment process. This solution, however, only requires 3.3 seconds, or even eliminates surge altogether, significantly improving reliability.

[0125] The solution of this invention is applicable not only to the start-up phase of magnetic levitation compressors with pressure ratios, but also to anti-surge control across the entire operating frequency range. When the unit determines that a surge has occurred and the frequency needs to be increased, the frequency change rate is increased first, and then the frequency is increased. This allows the target frequency to be reached quickly, effectively shortening the compressor surge time and reducing the airflow disturbance impact on the magnetic levitation bearing. It is applicable not only to units with multiple compressors but also to units with a single compressor.

[0126] Since the processing and functions implemented by the device in this embodiment are basically the same as the embodiments, principles and examples of the aforementioned methods, any details not covered in the description of this embodiment can be found in the relevant descriptions in the aforementioned embodiments, and will not be repeated here.

[0127] The technical solution of this embodiment determines whether the pressure ratio of the magnetic levitation compressor is greater than or equal to the set pressure ratio after the magnetic levitation compressor unit starts up. If it is, the frequency ramp-up of the magnetic levitation compressor is increased, and the compressor is controlled to ramp up at the increased frequency. If the operating frequency of the magnetic levitation compressor is higher than the surge frequency, the frequency ramp-up is decreased, and the compressor is controlled to ramp up at the decreased frequency. If the operating frequency reaches the preset target frequency, the compressor is controlled to operate at the target frequency. Thus, by controlling the pressure ratio and operating frequency of the magnetic levitation compressor, the frequency ramp-up of the compressor is controlled, preventing surge during the frequency ramp-up process, reducing the impact of airflow disturbance, and preventing large fluctuations in bearing rotor displacement. Simultaneously, during the compressor's operation after startup, precise frequency control is achieved, optimizing the energy efficiency of the magnetic levitation unit.

[0128] According to an embodiment of the present invention, an air conditioning system corresponding to a control device for an air conditioning system is also provided. This air conditioning system may include the control device for the air conditioning system described above.

[0129] Since the processing and functions implemented by the air conditioning system in this embodiment are basically the same as those of the aforementioned device embodiments, principles and examples, any details not covered in this embodiment can be found in the relevant descriptions in the aforementioned embodiments, and will not be repeated here.

[0130] The technical solution of this embodiment determines whether the pressure ratio of the magnetic levitation compressor is greater than or equal to the set pressure ratio after the magnetic levitation compressor unit starts up. If it is, the frequency ramp-up of the magnetic levitation compressor is increased, and the compressor is controlled to ramp up at the increased frequency. If the operating frequency of the magnetic levitation compressor is higher than the surge frequency, the frequency ramp-up is decreased, and the compressor is controlled to ramp up at the decreased frequency. If the operating frequency reaches the preset target frequency, the compressor is controlled to operate at the target frequency. Thus, by controlling the pressure ratio and operating frequency of the magnetic levitation compressor, the frequency ramp-up of the compressor is controlled, preventing surge during the frequency ramp-up process, reducing the impact of airflow disturbance, and preventing large fluctuations in bearing rotor displacement. Simultaneously, during the compressor's operation after startup, precise frequency control is achieved, optimizing the energy efficiency of the magnetic levitation unit.

[0131] According to an embodiment of the present invention, a storage medium corresponding to a control method for an air conditioning system is also provided. The storage medium includes a stored program, wherein the program controls the device where the storage medium is located to execute the control method for the air conditioning system described above when it is executed.

[0132] Since the processing and functions implemented by the storage medium in this embodiment are basically the same as the embodiments, principles and examples of the aforementioned methods, any details not covered in this embodiment can be found in the relevant descriptions in the aforementioned embodiments, and will not be repeated here.

[0133] The technical solution of this embodiment determines whether the pressure ratio of the magnetic levitation compressor is greater than or equal to the set pressure ratio after the magnetic levitation compressor unit starts up. If it is, the frequency ramp-up of the magnetic levitation compressor is increased, and the compressor is controlled to ramp up at the increased frequency. If the operating frequency of the magnetic levitation compressor is higher than the surge frequency, the frequency ramp-up is decreased, and the compressor is controlled to ramp up at the decreased frequency. If the operating frequency reaches the preset target frequency, the compressor is controlled to operate at the target frequency. Thus, by controlling the pressure ratio and operating frequency of the magnetic levitation compressor, the frequency ramp-up of the compressor is controlled, preventing surge during the frequency ramp-up process, reducing the impact of airflow disturbance, and preventing large fluctuations in bearing rotor displacement. Simultaneously, during the compressor's operation after startup, precise frequency control is achieved, optimizing the energy efficiency of the magnetic levitation unit.

[0134] In summary, it is readily understood by those skilled in the art that, without conflict, the aforementioned advantageous methods can be freely combined and superimposed.

[0135] The above description is merely an embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A control method for an air conditioning system, characterized in that, The air conditioning system includes: a magnetic levitation compressor unit and a heat exchange unit; the magnetic levitation compressor unit includes: a magnetic levitation compressor, and the number of magnetic levitation compressors is one or more; one or more magnetic levitation compressors share the heat exchange unit; the heat exchange unit includes: an outdoor heat exchanger and an indoor heat exchanger; the control method of the air conditioning system includes: After the magnetic levitation compressor unit starts up, for any one of the more than one magnetic levitation compressors, that magnetic levitation compressor is designated as the first magnetic levitation compressor; the pressure ratio of the first magnetic levitation compressor is obtained; During the startup process of the magnetic levitation compressor unit, it is determined whether the pressure ratio of the first magnetic levitation compressor is greater than or equal to the set pressure ratio; If it is determined that the pressure ratio of the first magnetic levitation compressor is greater than or equal to the set pressure ratio, then based on the preset frequency ramp rate of the first magnetic levitation compressor, the frequency ramp rate of the first magnetic levitation compressor is increased to obtain a first increased frequency ramp rate; and the frequency of the first magnetic levitation compressor is controlled to ramp at the first increased frequency ramp rate so that the frequency of the first magnetic levitation compressor is raised to above the preset surge frequency of the first magnetic levitation compressor. During the startup process of the magnetic levitation compressor unit, if the frequency of the first magnetic levitation compressor has increased to above the preset surge frequency of the first magnetic levitation compressor, or after the magnetic levitation compressor unit has started up, the frequency increase rate of the first magnetic levitation compressor is reduced to obtain a first reduced frequency increase rate; and the frequency of the first magnetic levitation compressor is controlled to increase at the first reduced frequency increase rate so that the frequency of the first magnetic levitation compressor increases to the preset target frequency of the first magnetic levitation compressor. If the frequency of the first magnetic levitation compressor has increased to the preset target frequency of the first magnetic levitation compressor, then the first magnetic levitation compressor is controlled to operate at the preset target frequency of the first magnetic levitation compressor.

2. The control method for the air conditioning system according to claim 1, characterized in that, in, Obtaining the pressure ratio of the first magnetic levitation compressor includes: The exhaust port pressure value and intake port pressure value of the first magnetic levitation compressor are obtained, and the pressure ratio of the first magnetic levitation compressor is represented by the pressure difference between the exhaust port pressure value and the intake port pressure value. Determining whether the pressure ratio of the first magnetic levitation compressor is greater than or equal to the set pressure ratio includes: Determine whether the pressure difference between the exhaust port pressure and the intake port pressure of the first magnetic levitation compressor is greater than a set pressure threshold. If the pressure difference between the exhaust port pressure and the intake port pressure of the first magnetic levitation compressor is greater than the set pressure threshold, then the pressure ratio of the first magnetic levitation compressor is considered to be greater than or equal to the set pressure ratio. or, The exhaust port temperature value and intake port temperature value of the first magnetic levitation compressor are obtained, and the pressure ratio of the first magnetic levitation compressor is represented by the temperature difference between the exhaust port temperature value and the intake port temperature value. Determining whether the pressure ratio of the first magnetic levitation compressor is greater than or equal to the set pressure ratio includes: Determine whether the temperature difference between the exhaust port temperature and the intake port temperature of the first magnetic levitation compressor is greater than a set temperature threshold. If the temperature difference between the exhaust port temperature and the intake port temperature of the first magnetic levitation compressor is greater than the set temperature threshold, then the pressure ratio of the first magnetic levitation compressor is considered to be greater than or equal to the set pressure ratio.

3. The control method for the air conditioning system according to claim 1, characterized in that, in, Based on the preset frequency ramp rate of the first magnetic levitation compressor, the frequency ramp rate of the first magnetic levitation compressor is increased to obtain a first increased frequency ramp rate, including: Based on the preset frequency increase rate of the first magnetic levitation compressor, the first preset frequency change rate is increased to obtain the first increased frequency increase rate; And / or, Reducing the frequency ramp rate of the first magnetic levitation compressor to obtain a first reduced frequency ramp rate includes: The first reduced frequency ramp rate is obtained by reducing the second preset frequency change rate; Wherein, the first preset frequency change rate is greater than or equal to the second preset frequency change rate.

4. The control method for the air conditioning system according to claim 3, characterized in that, Also includes: If the operating conditions and / or load of the magnetic levitation compressor unit change during the operation of the magnetic levitation compressor unit after startup, then any one of the magnetic levitation compressors shall be referred to as the second magnetic levitation compressor. The target frequency of the second magnetic levitation compressor is redefined and denoted as the new target frequency of the second magnetic levitation compressor. If the target frequency of the new second magnetic levitation compressor is greater than the preset target frequency of the second magnetic levitation compressor, the frequency ramping rate of the second magnetic levitation compressor is increased based on the preset ramping rate of the second magnetic levitation compressor to obtain a second increased ramping rate. The frequency of the second magnetic levitation compressor is controlled to increase at the second increased frequency rate so that the preset target frequency of the second magnetic levitation compressor is raised to the new target frequency of the second magnetic levitation compressor; then, the second magnetic levitation compressor is controlled to operate at the new target frequency of the second magnetic levitation compressor. If the target frequency of the new second magnetic levitation compressor is less than the preset target frequency of the second magnetic levitation compressor, the frequency reduction rate of the second magnetic levitation compressor is reduced based on the preset frequency reduction rate of the second magnetic levitation compressor to obtain a first reduced frequency reduction rate; and the frequency of the second magnetic levitation compressor is controlled to be reduced at the first reduced frequency reduction rate so that the preset target frequency of the second magnetic levitation compressor is reduced to the new target frequency of the second magnetic levitation compressor; then, the second magnetic levitation compressor is controlled to operate at the new target frequency of the second magnetic levitation compressor.

5. The control method for the air conditioning system according to claim 4, characterized in that, in, Based on the preset frequency ramp rate of the second magnetic levitation compressor, the frequency ramp rate of the second magnetic levitation compressor is increased to obtain a second increased frequency ramp rate, including: Based on the preset frequency increase rate of the second magnetic levitation compressor, the third preset frequency change rate is increased to obtain the second increased frequency increase rate; And / or, Based on the preset frequency reduction rate of the second magnetic levitation compressor, the frequency reduction rate of the second magnetic levitation compressor is decreased to obtain a first frequency reduction rate, including: Based on the preset frequency reduction rate of the second magnetic levitation compressor, the fourth preset frequency change rate is reduced to obtain the first reduced frequency reduction rate; Wherein, the third preset frequency change rate and the fourth preset frequency change rate are both less than or equal to the second preset frequency change rate.

6. A control device for an air conditioning system, characterized in that, The air conditioning system includes: a magnetic levitation compressor unit and a heat exchange unit; the magnetic levitation compressor unit includes: a magnetic levitation compressor, and the number of magnetic levitation compressors is one or more; one or more magnetic levitation compressors share the heat exchange unit; the heat exchange unit includes: an outdoor heat exchanger and an indoor heat exchanger; the control device of the air conditioning system includes: The acquisition unit is configured to, after the magnetic levitation compressor unit starts up, for any one of the more than one magnetic levitation compressors, designate that magnetic levitation compressor as the first magnetic levitation compressor; and acquire the pressure ratio of the first magnetic levitation compressor. The control unit is configured to determine whether the pressure ratio of the first magnetic levitation compressor is greater than or equal to a set pressure ratio during the startup process of the magnetic levitation compressor unit. The control unit is further configured to, if it is determined that the pressure ratio of the first magnetic levitation compressor is greater than or equal to the set pressure ratio, increase the frequency ramp rate of the first magnetic levitation compressor based on the preset ramp rate of the first magnetic levitation compressor to obtain a first increased ramp rate; and control the frequency of the first magnetic levitation compressor to ramp at the first increased ramp rate so that the frequency of the first magnetic levitation compressor is raised to above the preset surge frequency of the first magnetic levitation compressor. The control unit is further configured to, during the startup process of the magnetic levitation compressor unit, if the frequency of the first magnetic levitation compressor has increased to above a preset surge frequency of the first magnetic levitation compressor, or after the magnetic levitation compressor unit has started up, reduce the frequency ramp rate of the first magnetic levitation compressor to obtain a first reduced ramp rate; and control the frequency of the first magnetic levitation compressor to ramp up at the first reduced ramp rate so that the frequency of the first magnetic levitation compressor increases to a preset target frequency of the first magnetic levitation compressor; The control unit is further configured to control the first magnetic levitation compressor to operate at the preset target frequency if the frequency of the first magnetic levitation compressor has increased to the preset target frequency of the first magnetic levitation compressor.

7. The control device for the air conditioning system according to claim 6, characterized in that, in, The acquisition unit acquires the pressure ratio of the first magnetic levitation compressor, including: The exhaust port pressure value and intake port pressure value of the first magnetic levitation compressor are obtained, and the pressure ratio of the first magnetic levitation compressor is represented by the pressure difference between the exhaust port pressure value and the intake port pressure value. The control unit determines whether the pressure ratio of the first magnetic levitation compressor is greater than or equal to a set pressure ratio, including: Determine whether the pressure difference between the exhaust port pressure and the intake port pressure of the first magnetic levitation compressor is greater than a set pressure threshold. If the pressure difference between the exhaust port pressure and the intake port pressure of the first magnetic levitation compressor is greater than the set pressure threshold, then the pressure ratio of the first magnetic levitation compressor is considered to be greater than or equal to the set pressure ratio. or, The exhaust port temperature value and intake port temperature value of the first magnetic levitation compressor are obtained, and the pressure ratio of the first magnetic levitation compressor is represented by the temperature difference between the exhaust port temperature value and the intake port temperature value. The control unit determines whether the pressure ratio of the first magnetic levitation compressor is greater than or equal to a set pressure ratio, including: Determine whether the temperature difference between the exhaust port temperature and the intake port temperature of the first magnetic levitation compressor is greater than a set temperature threshold. If the temperature difference between the exhaust port temperature and the intake port temperature of the first magnetic levitation compressor is greater than the set temperature threshold, then the pressure ratio of the first magnetic levitation compressor is considered to be greater than or equal to the set pressure ratio.

8. The control device for the air conditioning system according to claim 6, characterized in that, in, The control unit, based on the preset frequency ramp rate of the first magnetic levitation compressor, increases the frequency ramp rate of the first magnetic levitation compressor to obtain a first increased frequency ramp rate, including: Based on the preset frequency increase rate of the first magnetic levitation compressor, the first preset frequency change rate is increased to obtain the first increased frequency increase rate; And / or, The control unit reduces the frequency ramp-up rate of the first magnetic levitation compressor to obtain a first reduced ramp-up rate, including: The first reduced frequency ramp rate is obtained by reducing the second preset frequency change rate; Wherein, the first preset frequency change rate is greater than or equal to the second preset frequency change rate.

9. The control device for the air conditioning system according to claim 8, characterized in that, The control unit further includes: If the operating conditions and / or load of the magnetic levitation compressor unit change during the startup and operation of the magnetic levitation compressor unit, then for any one of the magnetic levitation compressors, that magnetic levitation compressor is designated as the second magnetic levitation compressor; the target frequency of the second magnetic levitation compressor is redefined and designated as the new target frequency of the second magnetic levitation compressor. If the target frequency of the new second magnetic levitation compressor is greater than the preset target frequency of the second magnetic levitation compressor, the frequency ramping rate of the second magnetic levitation compressor is increased based on the preset ramping rate of the second magnetic levitation compressor to obtain a second increased ramping rate; and the frequency of the second magnetic levitation compressor is controlled to ramp up at the second increased ramping rate so that the preset target frequency of the second magnetic levitation compressor is raised to the new target frequency of the second magnetic levitation compressor; then, the second magnetic levitation compressor is controlled to operate at the new target frequency of the second magnetic levitation compressor. If the target frequency of the new second magnetic levitation compressor is less than the preset target frequency of the second magnetic levitation compressor, the frequency reduction rate of the second magnetic levitation compressor is reduced based on the preset frequency reduction rate of the second magnetic levitation compressor to obtain a first reduced frequency reduction rate; and the frequency of the second magnetic levitation compressor is controlled to be reduced at the first reduced frequency reduction rate so that the preset target frequency of the second magnetic levitation compressor is reduced to the new target frequency of the second magnetic levitation compressor; then, the second magnetic levitation compressor is controlled to operate at the new target frequency of the second magnetic levitation compressor.

10. The control device for the air conditioning system according to claim 9, characterized in that, in, The control unit, based on the preset frequency ramp rate of the second magnetic levitation compressor, increases the frequency ramp rate of the second magnetic levitation compressor to obtain a second increased frequency ramp rate, including: Based on the preset frequency increase rate of the second magnetic levitation compressor, the third preset frequency change rate is increased to obtain the second increased frequency increase rate; And / or, The control unit, based on the preset frequency reduction rate of the second magnetic levitation compressor, reduces the frequency reduction rate of the second magnetic levitation compressor to obtain a first frequency reduction rate, including: Based on the preset frequency reduction rate of the second magnetic levitation compressor, the fourth preset frequency change rate is reduced to obtain the first reduced frequency reduction rate; Wherein, the third preset frequency change rate and the fourth preset frequency change rate are both less than or equal to the second preset frequency change rate.

11. An air conditioning system, characterized in that, include: The control device for the air conditioning system as described in any one of claims 6 to 10.

12. A storage medium, characterized in that, The storage medium includes a stored program, wherein, when the program is executed, the device containing the storage medium is controlled to perform the control method of the air conditioning system according to any one of claims 1 to 5.

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