Method and system for suppressing transient impact of a variable frequency compressor start-up

Abstract

The application provides a method and system for suppressing transient impact of a variable frequency compressor during startup, the method comprising: obtaining a startup condition of the variable frequency compressor; the startup condition comprising: cold startup and hot startup; the startup condition being determined by a variable frequency drive electronic control module, which is used to drive the variable frequency compressor; if the startup condition of the variable frequency compressor is cold startup, obtaining a first stator temperature of the variable frequency compressor; determining a startup parameter of the variable frequency compressor according to the first stator temperature; if the startup condition of the variable frequency compressor is hot startup, obtaining a second stator temperature of the variable frequency compressor; and determining a startup parameter of the variable frequency compressor according to the second stator temperature, so as to solve the problem that a variable frequency refrigerator cannot automatically adjust the positioning current, open-loop drag time and oil return speed running time of the compressor during startup according to the actual temperature of the compressor, thereby reducing the efficiency of the compressor.

Description

Technical Field

[0001] This application relates to the field of refrigeration equipment technology, and in particular to a method and system for suppressing transient shocks during the start-up of a variable frequency compressor. Background Technology

[0002] Inverter compressors in refrigerators can flexibly adjust their operating speed according to the cooling needs inside the refrigerator, thereby achieving more precise temperature control and a higher energy efficiency ratio. However, the matching of the start-up process and operating parameters of the inverter compressor is crucial under different ambient temperatures and operating conditions, as this directly affects the compressor's start-up performance, operating energy efficiency, and the overall reliability and noise level of the unit.

[0003] Currently, a series of solutions are adopted for parameter matching of refrigerator inverter compressors. Before the compressors are mass-produced and used in complete units, comprehensive parameter matching is performed based on the characteristics of different compressors. This includes not only compressor motor parameters, but also the positioning current during the positioning phase, the duration and speed increase rate of the open-loop drive phase, the speed switching point and speed increase rate from open-loop to closed-loop operation, the compressor's oil return speed, the speed increase and decrease rates during the operation phase at a given speed, avoidance frequency control parameters, and speed loop PID parameter adjustments. After passing relevant tests by the complete unit and compressor manufacturers, these parameters are fixed in the driver program and remain unchanged under normal operating conditions. Furthermore, compressor matching is usually tested and set under various ambient temperatures based on the requirements of the complete unit.

[0004] However, because the viscosity of the compressor's lubricating oil changes with temperature, a compressor matched to high ambient temperatures in summer may experience starting difficulties in low ambient temperatures in winter, while a compressor matched to low ambient temperatures in winter may experience large transient shocks during startup in high ambient temperatures in summer, even producing abnormal noises. On the other hand, inverter refrigerators may stop and restart during operation. At this time, the compressor temperature is high and the lubricating oil viscosity is low. If the compressor is started according to the parameters matched at room temperature, it is also prone to problems such as large transient shocks and abnormal noises during startup. In addition, the energy efficiency of the compressor is extremely low during the positioning stage, open-loop drive stage, and oil return speed stage during startup. In existing technologies, the parameters of these stages are fixed and cannot be automatically adjusted according to the actual temperature and other conditions of the compressor, which is not conducive to further improving the energy efficiency of the compressor. Summary of the Invention

[0005] This application provides a method and system for suppressing transient shocks during the start-up of a variable frequency compressor, in order to solve the technical problem that existing variable frequency refrigerators cannot automatically adjust the positioning current, open-loop drag time, and oil return speed running time during compressor start-up according to the actual temperature of the compressor, resulting in low compressor energy efficiency.

[0006] The first aspect of this application provides a method for suppressing transient shocks during the startup of a variable frequency compressor, comprising: The starting status of the variable frequency compressor is obtained; the starting status includes: cold start and hot start; the starting status is determined by the variable frequency drive control module, which is used to drive the variable frequency compressor; If the variable frequency compressor is cold-started, then the first stator temperature of the variable frequency compressor is obtained; Based on the first stator temperature, the starting parameters of the variable frequency compressor are determined; the starting parameters include: positioning current, positioning time, open-loop drive current, open-loop drive time, open-loop speed rise rate, closed-loop speed, oil return speed, and oil return speed duration. If the variable frequency compressor starts in a hot start condition, then the second stator temperature of the variable frequency compressor is obtained; The starting parameters of the variable frequency compressor are determined based on the second stator temperature.

[0007] In some embodiments, the step of obtaining the startup status of the variable frequency compressor includes: When the entire machine containing the variable frequency drive control module is shut down, it is determined whether the variable frequency drive control module loses power. If so, the variable frequency compressor will start as a cold start. If not, the variable frequency compressor will start as a hot start.

[0008] In some embodiments, the step of determining the start-up parameters of the variable frequency compressor based on the first stator temperature includes: If the first stator temperature is lower than the preset standard temperature, determine whether the first stator temperature is within the first preset temperature range; If so, the positioning current is increased by the first preset ratio and the oil return speed duration is extended by the second preset ratio. If not, determine whether the temperature of the first stator is within the second preset temperature range; If so, the positioning current will be increased according to the third preset ratio and the duration of the return oil speed will be extended according to the fourth preset ratio. If not, determine whether the temperature of the first stator is within the third preset temperature range; If so, the positioning current will be increased according to the fifth preset ratio and the duration of the return oil speed will be extended according to the sixth preset ratio.

[0009] In some embodiments, the step of determining the start-up parameters of the variable frequency compressor based on the first stator temperature includes: If the temperature of the first stator is greater than the preset standard temperature, determine whether the temperature of the first stator is within the fourth preset temperature range; If so, the positioning current will be increased according to the seventh preset ratio and the duration of the return oil speed will be extended according to the eighth preset ratio. If not, determine whether the temperature of the first stator is within the fifth preset temperature range; If so, the positioning current will be increased according to the ninth preset ratio and the duration of the return oil speed will be extended according to the tenth preset ratio. If not, determine whether the temperature of the first stator is within the sixth preset temperature range; If so, the positioning current will be increased according to the eleventh preset ratio and the duration of the return oil speed will be extended according to the twelfth preset ratio.

[0010] In some embodiments, the step of determining the start-up parameters of the variable frequency compressor based on the second stator temperature includes: If the temperature of the second stator is lower than the preset standard temperature, the variable frequency compressor is started according to the preset matching parameters.

[0011] In some embodiments, the step of determining the start-up parameters of the variable frequency compressor based on the second stator temperature includes: If the second stator temperature is greater than the preset standard temperature, determine whether the first stator temperature is within the seventh preset temperature range; If so, reduce the positioning current according to the thirteenth preset ratio and shorten the duration of the return oil speed according to the fourteenth preset ratio; If not, determine whether the temperature of the second stator is within the eighth preset temperature range; If so, the positioning current will be reduced according to the fifteenth preset ratio and the duration of the return oil speed will be shortened according to the sixteenth preset ratio.

[0012] In some embodiments, the step of determining the start-up parameters of the variable frequency compressor based on the second stator temperature includes: If the second stator temperature is not within the eighth preset temperature range, the variable frequency compressor is started according to the preset matching parameters.

[0013] In some embodiments, the preset matching parameter is the start-up parameter of the variable frequency compressor at a preset standard temperature.

[0014] A second aspect of this application provides a system for suppressing transient shocks during the start-up of a variable frequency compressor, comprising: The acquisition module is configured to acquire the starting status of the variable frequency compressor; the starting status includes: cold start and hot start; the starting status is determined by the variable frequency drive control module, which is used to drive the variable frequency compressor; The first determining module is configured to obtain the first stator temperature of the variable frequency compressor if the starting condition of the variable frequency compressor is cold start; Based on the first stator temperature, the starting parameters of the variable frequency compressor are determined; the starting parameters include: positioning current, positioning time, open-loop drive current, open-loop drive time, open-loop speed rise rate, closed-loop speed, oil return speed, and oil return speed duration. The second determining module is configured to obtain the second stator temperature of the variable frequency compressor if the starting condition of the variable frequency compressor is hot start; The starting parameters of the variable frequency compressor are determined based on the second stator temperature.

[0015] This application provides a method and system for suppressing transient shocks during the startup of a variable frequency compressor. The method includes: acquiring the startup status of the variable frequency compressor; the startup status includes cold start and hot start; the startup status is determined by a variable frequency drive control module, which drives the variable frequency compressor; if the startup status of the variable frequency compressor is cold start, then acquiring the first stator temperature of the variable frequency compressor; determining the startup parameters of the variable frequency compressor based on the first stator temperature; the startup parameters include: positioning current, positioning time, open-loop drive current, open-loop drive time, open-loop speed rise rate, closed-loop speed, oil return speed, and oil return speed duration; if the startup status of the variable frequency compressor is hot start, then acquiring the second stator temperature of the variable frequency compressor; determining the startup parameters of the variable frequency compressor based on the second stator temperature, so as to enable the variable frequency refrigerator to automatically adjust the positioning current, open-loop drive time, and oil return speed running time during compressor startup according to the actual temperature of the compressor, thereby improving the compressor's energy efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a flowchart of the method for suppressing transient shocks during the startup of a variable frequency compressor in this application; Figure 2 This is a waveform diagram of the current during the start-up process of the variable frequency compressor in this application. Detailed Implementation

[0018] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application.

[0019] In some technologies, inverter refrigerators cannot automatically adjust the compressor's starting current, open-loop drive time, and oil return speed running time according to the actual compressor temperature, resulting in low compressor energy efficiency. To solve this technical problem, this application provides a method and system for suppressing transient shocks during inverter compressor startup. The method and system for suppressing transient shocks during inverter compressor startup are described below: like Figure 1 The diagram shown is a flowchart of the method for suppressing transient shocks during the startup of a variable frequency compressor in this application.

[0020] Matching of variable frequency compressors is performed year-round, and compressor temperature affects its starting performance. At lower temperatures compared to the matching temperature, starting difficulties may occur. At higher temperatures, large transient shocks may occur during startup, even producing a loud "thump" noise. This application fixes the ambient temperature for variable frequency compressor matching (25°C). During actual operation on the unit, the actual compressor temperature is first detected using winding testing technology and compared with the matching temperature (25°C). A specific control strategy is then employed to adjust the positioning current. Positioning time Open-loop drive current Open-loop drag time Open-loop rotational speed increase rate Closed-loop speed Oil return speed Oil return speed duration These parameters address the difficulties in compressor startup caused by changes in ambient temperature, as well as the problem of large transient shocks during startup. The specific solution is as follows: The first aspect of this application provides a method for suppressing transient shocks during the startup of a variable frequency compressor, comprising the following steps: S100: Obtain the starting status of the variable frequency compressor; the starting status includes: cold start and hot start; the starting status is determined by the variable frequency drive control module, which is used to drive the variable frequency compressor.

[0021] The step of obtaining the startup status of the variable frequency compressor includes the following sub-steps: S110: Determine whether the variable frequency drive control module loses power when the entire machine containing the variable frequency drive control module is shut down.

[0022] S120: If so, the variable frequency compressor will start as a cold start.

[0023] S130: If not, the variable frequency compressor will start as a hot start.

[0024] Specifically, depending on whether the variable frequency drive control module loses power when the entire machine stops, the start-up of the compressor is divided into two categories: start-up when the variable frequency drive control module loses power (cold start) and start-up during the operation of the entire machine (hot start).

[0025] The variable frequency drive (VFD) control module controls the entire unit (variable frequency refrigerator). Based on whether the VFD control module loses power when the unit stops, compressor startup is categorized into startup when the VFD control module loses power (cold start), including initial power-on startup and startup after a prolonged power outage. Startup when the VFD control module does not lose power (hot start) mainly includes restarting the unit during operation according to the main control rules. Before starting the compressor, it is necessary to determine whether it is a "cold start" or a "hot start."

[0026] S200: If the variable frequency compressor is in a cold start state, then obtain the first stator temperature of the variable frequency compressor.

[0027] S300: Determine the starting parameters of the variable frequency compressor based on the first stator temperature; the starting parameters include: positioning current. Positioning time Open-loop drive current Open-loop drag time Open-loop rotational speed increase rate Closed-loop speed Oil return speed Oil return speed duration .

[0028] The step of determining the start-up parameters of the variable frequency compressor based on the first stator temperature includes the following sub-steps: S301: If the first stator temperature is lower than the preset standard temperature, determine whether the first stator temperature is within the first preset temperature range.

[0029] S302: If so, the positioning current is increased according to the first preset ratio and the oil return speed duration is extended according to the second preset ratio.

[0030] S303: If not, determine whether the temperature of the first stator is within the second preset temperature range.

[0031] S304: If so, the positioning current is increased according to the third preset ratio and the oil return speed duration is extended according to the fourth preset ratio.

[0032] S305: If not, determine whether the temperature of the first stator is within the third preset temperature range.

[0033] S306: If so, increase the positioning current according to the fifth preset ratio and extend the oil return speed duration according to the sixth preset ratio.

[0034] S307: If the temperature of the first stator is greater than the preset standard temperature, determine whether the temperature of the first stator is within the fourth preset temperature range.

[0035] S308: If so, the positioning current will be increased according to the seventh preset ratio and the oil return speed duration will be extended according to the eighth preset ratio.

[0036] S309: If not, determine whether the temperature of the first stator is within the fifth preset temperature range.

[0037] S310: If so, increase the positioning current according to the ninth preset ratio and extend the oil return speed duration according to the tenth preset ratio.

[0038] S311: If not, determine whether the temperature of the first stator is within the sixth preset temperature range.

[0039] S312: If so, the positioning current will be increased according to the eleventh preset ratio and the oil return speed duration will be extended according to the twelfth preset ratio.

[0040] Specifically, if the variable frequency drive control module determines that the compressor is starting as a "cold start", the variable frequency drive control module first checks the compressor stator temperature T. If the compressor stator temperature T is lower than the standard temperature at the matching point... (25°C), for every 10°C decrease, adjust according to a certain proportion. ( =1.05、 =1.1、 =1.15) Increase positioning current When the temperature is below -5°C, it will still be used as follows. The positioning current is proportional. Simultaneously, for every 10°C decrease, it is adjusted proportionally. ( =1.1、 =1.2、 =1.3) Extend the duration of oil return speed This addresses the difficulties in starting up and mechanical lubrication under low ambient temperature conditions. If the compressor stator temperature T is higher than the standard temperature at the time of matching... (25°C), and for every 10°C increase, adjust according to a certain proportion. ( =0.95、 =0.9、 =0.85) Reduce positioning current When the temperature is above 55°C, it should still be followed. The variable frequency compressor is started with a proportional positioning current. At the same time, the oil return running time remains unchanged, thus solving the transient impact during startup under high temperature conditions.

[0041] S400: If the variable frequency compressor is in a hot start state, then obtain the second stator temperature of the variable frequency compressor.

[0042] S500: Determine the starting parameters of the variable frequency compressor based on the second stator temperature.

[0043] The step of determining the starting parameters of the variable frequency compressor based on the second stator temperature includes the following sub-steps: S510: If the second stator temperature is lower than the preset standard temperature, the variable frequency compressor is started according to the preset matching parameters. The preset matching parameters are the start-up parameters of the variable frequency compressor at the preset standard temperature.

[0044] For example, the compressor is matched at a standard ambient temperature (25°C), and a set of variable frequency compressor starting parameters are determined through testing under this temperature condition. These parameters include: positioning current ( ), positioning time ( ), open-loop drive current ( ), Open-loop drag time ( ), open-loop speed increase rate ( ), Closed-loop speed ( ), return oil speed ( ), duration of return oil speed ( )wait.

[0045] Specifically, if the variable frequency drive control module determines that the compressor startup is a "hot start," the variable frequency drive control module first detects the compressor stator temperature T (related patent pending). If the compressor stator temperature T is lower than the standard temperature at the matching point... (25°C), start the variable frequency compressor according to the preset matching parameters.

[0046] S520: If the second stator temperature is greater than the preset standard temperature, determine whether the first stator temperature is within the seventh preset temperature range.

[0047] S530: If so, reduce the positioning current according to the thirteenth preset ratio and shorten the duration of the return oil speed according to the fourteenth preset ratio.

[0048] S540: If not, determine whether the temperature of the second stator is within the eighth preset temperature range.

[0049] S550: If so, reduce the positioning current according to the fifteenth preset ratio and shorten the duration of the return oil speed according to the sixteenth preset ratio.

[0050] Specifically, if the compressor stator temperature T is higher than the standard temperature at the time of matching... (25°C), and for every 10°C increase, adjust according to a certain proportion. ( =0.95、 =0.9) Reduce positioning current At the same time, for every 10°C increase, a certain proportion is applied. ( =0.9、 =0.8) Shorten the duration of oil return speed This reduces the transient impact of compressor startup and saves energy.

[0051] S560: If the second stator temperature is not within the eighth preset temperature range, the variable frequency compressor is started according to the preset matching parameters.

[0052] Specifically, when the winding temperature is above 55°C, it indicates that the overall load of the machine is heavy, and the variable frequency compressor should be started according to the preset matching parameters.

[0053] For example, such as Figure 2 As shown, the start-up of the variable frequency refrigerator compressor is divided into the following stages: (1) Compressor motor rotor positioning stage: the variable frequency drive finds the rotor position. (2) Open-loop drive stage: the variable frequency drive drives the motor rotor to rotate to a certain speed to detect the back electromotive force of the motor. (3) Closed-loop control stage: through the back electromotive force information, the accurate position information of the motor rotor is obtained to realize closed-loop control. (4) Oil return speed control stage: the compressor machinery is fully lubricated. (5) Given speed operation stage: according to the needs of the main control of the whole machine, the compressor is made to work in each speed range to realize the refrigeration function of the whole machine.

[0054] This application provides a method for suppressing transient shocks during the start-up of a variable frequency compressor. During cold start, the variable frequency drive first detects the compressor stator temperature. If the compressor stator temperature is lower than the standard temperature (25°C) at the matching point, the positioning current is increased by a certain proportion. Oil return speed duration This addresses the starting difficulties under low ambient temperature conditions. If the compressor stator temperature is higher than the standard matching temperature (25°C), the positioning current is reduced proportionally. Oil return speed duration This design addresses the issue of large transient shocks during startup that may occur under high ambient temperatures, while also achieving energy savings. During the machine's operation and startup (hot start), the variable frequency drive first detects the compressor stator temperature (related patent pending). When the winding temperature is 25°C or below, the compressor starts according to the matching parameters. When the winding temperature is between 25°C and 55°C, the positioning current is reduced proportionally for every 10°C increase. Positioning time Oil return speed duration This design addresses the issue of large transient shocks that can easily occur during hot starts, while simultaneously enabling the compressor to quickly reach the required operating speed, thus achieving energy savings. When the compressor stator temperature exceeds 55°C, it indicates a heavy load on the machine, and the inverter compressor starts according to the preset matching parameters.

[0055] This application provides a method for suppressing transient shocks during the start-up of a variable frequency compressor, which has the following beneficial effects: 1. Currently, once a refrigerator inverter compressor is matched, its startup parameters are fixed and do not change with ambient temperature. Since the viscosity of the compressor lubricating oil is temperature-dependent, the compressor may experience startup difficulties when the ambient temperature is lower than during matching, and may experience large transient shocks during startup when the ambient temperature is higher than during matching. This application addresses this issue by first detecting the compressor temperature before startup and then optimizing the startup parameters using a control strategy based on the actual temperature relative to the matching temperature. This effectively improves the problems of startup difficulties or large transient shocks caused by temperature changes.

[0056] 2. The key to energy saving in inverter refrigerators is to ensure the compressor operates at a reasonable speed according to the main control rules. During the compressor start-up phase, the speed is primarily to meet the compressor's starting performance and lubricate the mechanical system; energy efficiency is generally low during this phase. However, during normal operation, the refrigerator's shutdown time is short, and the mechanical system is in a lubrication state. The subsequent start-up (hot start) still follows the parameters determined during matching. This application optimizes the start-up parameters based on the compressor temperature, enabling the compressor to quickly reach the speed required by the main control rules, thus achieving a certain energy-saving effect.

[0057] A second aspect of this application provides a system for suppressing transient shocks during the start-up of a variable frequency compressor, comprising: The acquisition module is configured to acquire the starting status of the variable frequency compressor; the starting status includes: cold start and hot start; the starting status is determined by the variable frequency drive control module, which is used to drive the variable frequency compressor; The first determining module is configured to obtain the first stator temperature of the variable frequency compressor if the starting condition of the variable frequency compressor is cold start; Based on the first stator temperature, the starting parameters of the variable frequency compressor are determined; the starting parameters include: positioning current, positioning time, open-loop drive current, open-loop drive time, open-loop speed rise rate, closed-loop speed, oil return speed, and oil return speed duration. The second determining module is configured to obtain the second stator temperature of the variable frequency compressor if the starting condition of the variable frequency compressor is hot start; The starting parameters of the variable frequency compressor are determined based on the second stator temperature.

[0058] It is worth noting that the effects of the above system embodiments can be found in the effects of the above method embodiments, and will not be repeated here.

[0059] The above detailed embodiments further illustrate the purpose, technical solution, and beneficial effects of the embodiments of this application. It should be understood that the above are merely specific embodiments of the embodiments of this application and are not intended to limit the protection scope of the embodiments of this application. Any modifications, equivalent substitutions, improvements, etc., made on the basis of the technical solutions of the embodiments of this application should be included within the protection scope of the embodiments of this application.

Claims

1. A method for suppressing transient shocks during the start-up of a variable frequency compressor, characterized in that, include: Obtain the startup status of the variable frequency compressor; The startup conditions include: cold start and hot start; the startup conditions are determined by the variable frequency drive control module, which is used to drive the variable frequency compressor; If the variable frequency compressor is cold-started, then the first stator temperature of the variable frequency compressor is obtained; Based on the first stator temperature, the starting parameters of the variable frequency compressor are determined; the starting parameters include: positioning current, positioning time, open-loop drive current, open-loop drive time, open-loop speed rise rate, closed-loop speed, oil return speed, and oil return speed duration. If the variable frequency compressor starts in a hot start condition, then the second stator temperature of the variable frequency compressor is obtained; The starting parameters of the variable frequency compressor are determined based on the second stator temperature.

2. The method for suppressing transient shock during startup of a variable frequency compressor according to claim 1, characterized in that, The step of obtaining the start-up status of the variable frequency compressor includes: When the entire machine containing the variable frequency drive control module is shut down, it is determined whether the variable frequency drive control module loses power. If so, the variable frequency compressor will start as a cold start. If not, the variable frequency compressor will start as a hot start.

3. The method for suppressing transient shock during startup of a variable frequency compressor according to claim 1, characterized in that, The step of determining the starting parameters of the variable frequency compressor based on the first stator temperature includes: If the first stator temperature is lower than the preset standard temperature, determine whether the first stator temperature is within the first preset temperature range; If so, the positioning current is increased by the first preset ratio and the oil return speed duration is extended by the second preset ratio. If not, determine whether the temperature of the first stator is within the second preset temperature range; If so, the positioning current will be increased according to the third preset ratio and the duration of the return oil speed will be extended according to the fourth preset ratio. If not, determine whether the temperature of the first stator is within the third preset temperature range; If so, the positioning current will be increased according to the fifth preset ratio and the duration of the return oil speed will be extended according to the sixth preset ratio.

4. The method for suppressing transient shock during startup of a variable frequency compressor according to claim 1, characterized in that, The step of determining the starting parameters of the variable frequency compressor based on the first stator temperature includes: If the temperature of the first stator is greater than the preset standard temperature, determine whether the temperature of the first stator is within the fourth preset temperature range; If so, the positioning current will be increased according to the seventh preset ratio and the duration of the return oil speed will be extended according to the eighth preset ratio. If not, determine whether the temperature of the first stator is within the fifth preset temperature range; If so, the positioning current will be increased according to the ninth preset ratio and the duration of the return oil speed will be extended according to the tenth preset ratio. If not, determine whether the temperature of the first stator is within the sixth preset temperature range; If so, the positioning current will be increased according to the eleventh preset ratio and the duration of the return oil speed will be extended according to the twelfth preset ratio.

5. The method for suppressing transient shock during startup of a variable frequency compressor according to claim 1, characterized in that, The step of determining the starting parameters of the variable frequency compressor based on the second stator temperature includes: If the temperature of the second stator is lower than the preset standard temperature, the variable frequency compressor is started according to the preset matching parameters.

6. The method for suppressing transient shock during startup of a variable frequency compressor according to claim 1, characterized in that, The step of determining the starting parameters of the variable frequency compressor based on the second stator temperature includes: If the second stator temperature is greater than the preset standard temperature, determine whether the first stator temperature is within the seventh preset temperature range; If so, reduce the positioning current according to the thirteenth preset ratio and shorten the duration of the return oil speed according to the fourteenth preset ratio; If not, determine whether the temperature of the second stator is within the eighth preset temperature range; If so, the positioning current will be reduced according to the fifteenth preset ratio and the duration of the return oil speed will be shortened according to the sixteenth preset ratio.

7. The method for suppressing transient shock during startup of a variable frequency compressor according to claim 6, characterized in that, The step of determining the starting parameters of the variable frequency compressor based on the second stator temperature includes: If the second stator temperature is not within the eighth preset temperature range, the variable frequency compressor is started according to the preset matching parameters.

8. A method for suppressing transient shocks during the start-up of a variable frequency compressor according to claim 5 or 7, characterized in that, The preset matching parameters are the start-up parameters of the variable frequency compressor at a preset standard temperature.

9. A system for suppressing transient shocks during the start-up of a variable frequency compressor, characterized in that, include: The acquisition module is configured to acquire the startup status of the variable frequency compressor; The startup conditions include: cold start and hot start; the startup conditions are determined by the variable frequency drive control module, which is used to drive the variable frequency compressor; The first determining module is configured to obtain the first stator temperature of the variable frequency compressor if the starting condition of the variable frequency compressor is cold start; Based on the first stator temperature, the starting parameters of the variable frequency compressor are determined; the starting parameters include: positioning current, positioning time, open-loop drive current, open-loop drive time, open-loop speed rise rate, closed-loop speed, oil return speed, and oil return speed duration. The second determining module is configured to obtain the second stator temperature of the variable frequency compressor if the starting condition of the variable frequency compressor is hot start; The starting parameters of the variable frequency compressor are determined based on the second stator temperature.

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