Control Parameter Switching Method, Switching System and Air Conditioning Unit

Abstract

The present invention discloses a control parameter switching method, a switching system and an air-conditioning unit. The control parameter switching method includes the following steps: establishing an operating parameter library reflecting the correspondence between the operating frequency of a power component and a control parameter table; adjusting the power component according to a frequency conversion instruction; collecting detection data that changes due to the execution of the frequency conversion instruction; determining whether the change amount of the detection data before and after the frequency conversion adjustment exceeds a set threshold; if so, performing a variable parameter operation according to the operating parameter library and the actual operating frequency of the power component after the frequency conversion adjustment; if not, maintaining the current control parameter of the power component. The present invention can enhance the stability of the compressor operating at various frequencies and smoothly switch the control parameters of the power component.

Description

Technical Field

[0001] The present invention relates to the technical field of variable frequency control, and particularly to a control parameter switching method, a switching system and an air-conditioning unit. Background Art

[0002] Common power components such as compressors are widely used in various equipment. Taking a refrigeration system as an example, as the requirements for the target storage temperature are different, the operating frequency of the compressor is also different. Usually, different control parameters correspond to different operating frequencies of the compressor; among them, there are many factors affecting the control parameters, the most direct ones are the change of the operating frequency and the change of the load, and different compressor control parameters are also different. At present, the switching of compressor control parameters is mainly to debug the control parameters of different frequency bands in advance manually. When the unit runs to the corresponding frequency point, the control parameters are switched accordingly.

[0003] The evaluation basis of this variable parameter depends solely on the change of frequency, which cannot effectively ensure the precise control of the compressor operation by the control parameters in each frequency band. Moreover, the current variable parameter operation is too simple and rough. Usually, the variable parameter operation is executed when the operating frequency of the compressor changes, resulting in frequent switching of control parameters and poor operation stability of the compressor. And when executing the variable parameter operation, the new parameter value is directly superimposed, and then the old parameter value is gradually subtracted. This variable parameter process usually causes distortion of the parameters at the moment of superimposing the new parameter value, and the suddenly increased parameter value is very likely to not meet the current control operation of the compressor.

[0004] Therefore, how to design a control parameter switching method to enhance the operation stability of each frequency of the compressor is a technical problem urgently to be solved in the industry. Summary of the Invention

[0005] In order to solve the defect that the existing variable parameter scheme affects the operation stability of the power component, the present invention provides a control parameter switching method, a switching system and an air-conditioning unit. The control parameter switching method ensures the smooth switching of the control parameters of the power component and enhances the operation stability of each frequency of the power component by designing a reasonable variable parameter operation evaluation mechanism and transformation mechanism.

[0006] The technical solution adopted by the present invention is to design a control parameter switching method, including the following steps:

[0007] Establish an operating parameter library reflecting the correspondence between the operating frequency of the power component and the control parameter table;

[0008] Adjust the power component according to the variable frequency command;

[0009] Collect the detection data changed by executing the variable frequency command;

[0010] Determine whether the change amount of the detection data before and after frequency conversion adjustment exceeds the set threshold;

[0011] If so, perform variable parameter operation according to the operation parameter library and the actual operating frequency of the power component after frequency conversion adjustment;

[0012] If not, maintain the current control parameters of the power component.

[0013] In some embodiments, the detection data includes at least one of the effective current value output by the inverter to the power component and the actual operating frequency of the power component.

[0014] Further, the detection data includes the effective current value and the actual operating frequency; the calculation method of the change amount of the detection data is: collect the effective current value output by the inverter and the actual operating frequency of the power component within two or more current cycles before and after frequency conversion adjustment, find the maximum and minimum values of the effective current value to calculate the current change amount, and find the maximum and minimum values of the actual operating frequency to calculate the frequency change amount.

[0015] Further, determining whether the change amount of the detection data before and after frequency conversion adjustment exceeds the set threshold includes:

[0016] Determine whether the current change amount exceeds the set current threshold or the frequency change amount exceeds the set frequency threshold;

[0017] If so, determine that the change amount of the detection data exceeds the set threshold;

[0018] If not, determine that the change amount of the detection data does not exceed the set threshold.

[0019] Further, performing variable parameter operation according to the operation parameter library and the actual operating frequency of the power component after frequency conversion adjustment includes:

[0020] The operation parameter library contains at least two sets of control parameter tables set according to the operating frequency;

[0021] Read the control parameter table corresponding to the actual operating frequency of the power component after frequency conversion adjustment from the operation parameter library as the next set of parameter tables, and obtain the control parameter table of the power component before frequency conversion adjustment as the previous set of parameter tables;

[0022] Calculate and process the next set of parameter tables and the previous set of parameter tables to obtain an intermediate parameter table;

[0023] Determine whether the intermediate parameter table differs from the next set of parameter tables within the set threshold range;

[0024] If not, switch the current control parameters of the power component to the intermediate parameter table, use the intermediate parameter table as the previous set of parameter tables, and return to recalculate the intermediate parameter table;

[0025] If so, the variable parameter operation is completed, and the next set of parameter tables is used as the previous set of parameter tables.

[0026] Furthermore, each control parameter table in the operating parameter library includes at least one control parameter that matches its corresponding operating frequency. Determining whether the intermediate parameter table differs from the next set of parameter tables within a set threshold range includes:

[0027] Calculating the absolute value of the difference between each control parameter in the intermediate parameter table and the corresponding control parameter in the next set of parameter tables;

[0028] Finding the maximum value among all the absolute differences as the effective difference value;

[0029] Determining whether the effective difference value is within the set threshold range;

[0030] If so, it is determined that the intermediate parameter table differs from the next set of parameter tables within the set threshold range;

[0031] If not, it is determined that the intermediate parameter table differs from the next set of parameter tables outside the set threshold range.

[0032] In some embodiments, the value of each control parameter in the intermediate parameter table is the value obtained by adding half of the corresponding control parameter in the previous set of parameter tables and half of the corresponding control parameter in the next set of parameter tables.

[0033] Furthermore, before determining whether the change amount of the detection data before and after the frequency conversion adjustment exceeds the set threshold, first determine whether the actual operating frequency of the power component has changed. If not, maintain the current control parameters of the power component. If so, determine whether the change amount of the detection data before and after the frequency conversion adjustment exceeds the set threshold.

[0034] Furthermore, before adjusting the power component according to the frequency conversion instruction, first determine whether the power component has a fault. If so, execute fault protection shutdown. If not, adjust the power component according to the frequency conversion instruction.

[0035] In some embodiments, the power component is a compressor.

[0036] The present invention also proposes a control parameter switching system, including:

[0037] A main control module, which is used to issue a frequency conversion instruction according to the operating state of the unit where the power component is located;

[0038] A frequency conversion module, which is used to adjust the power component according to the frequency conversion instruction;

[0039] An acquisition module, which is used to acquire the detection data that changes due to the execution of the frequency conversion instruction;

[0040] When the change amount of the detected data before and after the frequency conversion adjustment exceeds the set threshold, the main control module performs a variable parameter operation according to the operation parameter library and the actual operation frequency of the power component after the frequency conversion adjustment;

[0041] When the change amount of the detected data before and after the frequency conversion adjustment does not exceed the set threshold, the main control module maintains the current control parameters of the power component.

[0042] Further, the control parameter switching system further includes: a display device communicatively connected to the main control module; the main control module controls the display device to display a control parameter table corresponding to the actual operation frequency of the power component after adjustment and / or issue a reminder signal when the variable parameter operation is completed.

[0043] The present invention also provides an air-conditioning unit, including: a compressor and a main control module, and the main control module controls the compressor by using the above control parameter switching method.

[0044] In some embodiments, the air-conditioning unit is a condensing unit.

[0045] Compared with the prior art, the present invention has the following beneficial effects:

[0046] 1. After adjusting the power component according to the frequency conversion instruction, it is necessary to judge whether the change amount of the detected data before and after the frequency conversion adjustment exceeds the set threshold, so as to avoid frequent switching of control parameters and achieve a more accurate control effect;

[0047] 2. Calculate the intermediate parameter table according to the control parameter tables before and after the frequency conversion adjustment. When the difference between the intermediate parameter table and the next set of parameter tables exceeds the set threshold range, calculate the intermediate parameter table step by step until the variable parameter operation is completed. The advantage of this parameter switching method is that it will not cause distortion of the control parameters at the moment of switching to the new parameter value, and it can also quickly complete the variable parameter operation, meeting the stable operation of the compressor during the variable parameter process. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The present invention will be described in detail below with reference to the embodiments and the drawings, wherein:

[0049] Figure 1 is a schematic diagram of the evaluation process for performing the variable parameter operation of the present invention;

[0050] Figure 2 is a schematic diagram of the variable parameter operation process of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0051] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0052] The applicable scenarios of the control parameter switching method proposed by the present invention include, but are not limited to, frequency conversion of motors such as compressors. This control parameter switching method mainly includes two design parts. One is the evaluation mechanism for performing variable parameter operations, and the other is the transformation mechanism for variable parameter operations. The following will be introduced in detail separately.

[0053] Regarding the evaluation mechanism for performing variable parameter operations:

[0054] Since it is not necessarily required to perform parameter transformation after the operating frequency of the power component changes. The reason is that usually, the control parameters can take into account the normal operation of the power component within a certain frequency change range. Therefore, in order to improve the accuracy of variable parameter operations, after adjusting the power component according to the frequency conversion instruction, it is necessary to collect the detection data that changes due to the execution of the frequency conversion instruction, and judge whether the change amount of the detection data before and after the frequency conversion adjustment exceeds the set threshold. Only when the threshold is exceeded is the variable parameter operation executed, avoiding the situation of frequent switching of control parameters.

[0055] In some embodiments, the detection data includes at least one of the effective current value output by the inverter to the power component and the actual operating frequency of the power component. On the basis of using the frequency change as the basis for judging parameter transformation, whether the effective phase current value output by the inverter to the power component or the actual operating frequency of the power component fluctuates beyond a certain range after the frequency change is used as the criterion for variable parameter operations. The design reason is that when the effective current value changes or the frequency change exceeds the threshold, it indicates that the current output by the inverter fluctuates greatly, and the current and speed closed-loop control is in a critical state. If the frequency of the power component increases further, there will be a situation of current runaway and protection shutdown. Therefore, the preferred solution is to collect the effective current value and the actual operating frequency before and after the frequency conversion adjustment at the same time.

[0056] The specific logic is as follows: After adjusting the power component according to the frequency conversion instruction, collect the effective current values output by the inverter within two or more current cycles before and after the frequency conversion adjustment, and the actual operating frequencies of the power component before and after the frequency conversion adjustment. Find the difference between the maximum value and the minimum value of the effective current value as the current change amount, and find the difference between the maximum value and the minimum value of the actual operating frequency as the frequency change amount. That is, use the maximum change amounts of current and frequency as the strengthening criterion. Usually, select three or more consecutive current cycles located before and after the frequency conversion adjustment. If the number of current cycles is too small, misjudgment of the effective value may occur due to other interferences. If it is too large, the period for calculating the effective value will be long, affecting the real-time performance of the execution of the control method and redundant calculations. After calculating the current change amount and the frequency change amount, if any one of the two change amounts is greater than its corresponding set threshold, it is determined that the change amount of the detected data exceeds the set threshold, and a variable parameter operation needs to be executed. If both change amounts are less than their corresponding set thresholds, it is determined that the change amount of the detected data does not exceed the set threshold, and no variable parameter operation is required. The set threshold should be greater than zero, but its specific value is affected by the interference of the unit where the power component is located. For equipment with large interference, the value of the set threshold can be slightly larger, and vice versa, the value of the set threshold can be slightly smaller.

[0057] It should be noted that the frequency conversion instruction can be any one of the frequency increase instruction, the frequency decrease instruction, and the frequency maintenance instruction. To improve the real-time performance of the execution of the control method and avoid redundant change amount calculations, before judging whether the change amount of the detected data before and after the frequency conversion adjustment exceeds the set threshold, first judge whether the actual operating frequency of the power component has changed, that is, judge whether the current operating frequency has changed compared with the actual operating frequency at the previous moment. The actual operating frequency at the previous moment refers to the actual operating frequency recorded when it was last judged whether the actual operating frequency has changed. If not, it means that the frequency of the power component has not changed, and the current control parameters of the power component can be maintained. If so, it means that the frequency of the power component has changed, and then judge whether the change amount of the detected data before and after the frequency conversion adjustment exceeds the set threshold to determine whether to execute the variable parameter operation.

[0058] In addition, in actual use, the power component may be unstable in its working state due to factors such as faults, and such faults will affect the accuracy of the evaluation of the variable parameter operation. Therefore, before adjusting the power component according to the frequency conversion instruction, first judge whether the power component has a fault. If so, execute the fault protection shutdown. If not, adjust the power component according to the frequency conversion instruction to ensure the evaluation mechanism for executing the variable parameter operation under the condition of a stable working state of the power component.

[0059] As Figure 1 shown, in a specific application example, the evaluation mechanism for the variable parameter operation includes the following steps:

[0060] Step 10: After power-on, read the start control parameter table of the power component;

[0061] Step 20: Determine whether a fault occurs in the power component. If so, execute fault protection shutdown; if not, proceed to Step 30;

[0062] Step 30: Adjust the power component according to the frequency conversion command;

[0063] Step 40: Collect the detection data that changes due to the execution of the frequency conversion command, and determine whether the actual operating frequency of the power component has changed. If so, proceed to Step 50; if not, proceed to Step 70;

[0064] Step 50: Determine whether the change amount of the detection data before and after frequency conversion adjustment exceeds the set threshold. If so, proceed to Step 60; if not, return to Step 40;

[0065] Step 60: Perform variable parameter operations according to the operation parameter library and the actual operating frequency of the power component after frequency conversion adjustment, and return to Step 50;

[0066] Step 70: Maintain the current control parameters of the power component and return to Step 20.

[0067] Transformation mechanism for variable parameter operations:

[0068] Each set of parameters during the variable parameter operation process should be able to meet the basic operating requirements of the power component. The control parameter tables in the operation parameter library can be one set or multiple sets. The probability that one set of parameter tables can meet the operation of the power component from low frequency to medium-high frequency is relatively small. Therefore, multiple sets of parameter tables are generally selected. Selecting multiple sets of parameter tables can, to a certain extent, subdivide the control parameter tables for different frequency bands and achieve a more precise control effect. The control parameter tables in the operation parameter library are control parameter tables that are pre-adjusted by technicians for the power component under different working conditions of the unit, and each set of parameters will be named Parameter One, Parameter Two, Parameter Three, etc. in ascending order of operating frequency. By analogy, the operation parameter library is stored in the memory chip. When the unit is powered on, a set of control parameter tables suitable for the initial startup of the power component will be fixedly operated. This control parameter table is the start control parameter table. After the unit operates normally, the corresponding control parameter tables will be switched under different working conditions.

[0069] When performing variable parameter operations, the control parameter table corresponding to the actual operating frequency of the power component after frequency conversion adjustment is read from the operating parameter library as the next set of parameter tables, and the control parameter table of the power component before frequency conversion adjustment is obtained as the previous set of parameter tables. The next set of parameter tables and the previous set of parameter tables are calculated and processed to obtain an intermediate parameter table. The previous set of parameter tables is equivalent to the starting parameter table of the variable parameter operation, the next set of parameter tables is equivalent to the target parameter table of the variable parameter operation, and the intermediate parameter table is equivalent to the transition parameter table between the starting parameter table and the target parameter table. The difference between the intermediate parameter table and the next set of parameter tables is compared with the set threshold range. If the difference is not within the set threshold range, it means that the difference between the next set of parameter tables and the previous set of parameter tables is relatively large. Switching directly to the next set of parameter tables may cause parameter distortion and affect the operating stability of the power component. Therefore, the current control parameters of the power component are switched to the intermediate parameter table, and the intermediate parameter table is used as the previous set of parameter tables, and the intermediate parameter table is recalculated until the difference between the intermediate parameter table and the next set of parameter tables is within the set threshold range, indicating that the difference between the previous set of parameter tables and the next set of parameter tables is very small, the parameter switch is successful, and the variable parameter operation is completed. The next set of parameter tables read in this variable parameter operation is used as the previous set of parameter tables for the next variable parameter operation. The advantage of this parameter switching method is that it will not cause parameter distortion at the moment of superimposing new parameter values, and it can also quickly perform the transformation of control parameters to meet the stable operation of the power component during the variable parameter operation.

[0070] It should be noted that each set of control parameter tables in the operating parameter library usually contains multiple control parameters that match the corresponding operating frequency. The specific logic for determining whether the intermediate parameter table differs from the next set of parameter tables within the set threshold range is as follows: Calculate the absolute value of the difference between each control parameter in the intermediate parameter table and the corresponding control parameter in the next set of parameter tables, and find the maximum value among all the absolute differences as the effective difference value. Determine whether the effective difference value is within the set threshold range. If it is, it is determined that the intermediate parameter table differs from the next set of parameter tables within the set threshold range; if not, it is determined that the intermediate parameter table differs from the next set of parameter tables outside the set threshold range. The set threshold range should be close to zero. The closer the set threshold range is to zero, the narrower the allowable difference range between the intermediate parameter table and the next set of parameter tables, and the more intermediate parameter tables are calculated during the variable parameter operation, and the variable parameter operation is gentle and accurate. The specific value of the set threshold range can be designed according to actual usage requirements.

[0071] There are several calculation methods for the intermediate parameter table. Taking one of them as an example, the values of the control parameters in the intermediate parameter table are the sum of half of the corresponding control parameters in the previous parameter table and half of the corresponding control parameters in the next parameter table. The advantage of this design is that it can not only shorten the number of calculations during the switching process between the upper and lower parameter tables, reduce the switching time, but also avoid parameter distortion during the switching process, ensuring the stable operation of the compressor. In actual applications, according to different design requirements, the control parameter values of the intermediate parameter table can also be obtained by adding the corresponding control parameters in the two parameter tables with different ratios. The present invention does not impose special restrictions on the specific calculation method of the intermediate parameter table.

[0072] As Figure 2 shown, in a specific application example, the transformation mechanism of the variable parameter operation includes the following steps:

[0073] Step 601: Read the control parameter table corresponding to the actual operating frequency of the power component before frequency conversion from the operating parameter library as the previous parameter table, and read the control parameter table corresponding to the actual operating frequency of the power component after frequency conversion as the next parameter table;

[0074] Step 602: Obtain half of each value in the previous parameter table, add half of each value in the next parameter, and use the sum of the separately added values as the intermediate parameter table;

[0075] Step 603: Determine whether the added intermediate parameter table differs from the next parameter table within the set threshold range. If so, enter Step 605; if not, enter Step 604;

[0076] Step 604: Switch the current control parameter of the power component to the intermediate parameter table, use the intermediate parameter table as the previous parameter table, and return to Step 602;

[0077] Step 605: The parameter switching is successful, and the variable parameter operation is completed.

[0078] The present invention also proposes a control parameter switching system, including: a main control module, a frequency conversion module, and a collection module. The main control module is used to issue a frequency conversion instruction according to the operating state of the unit where the power component is located. The frequency conversion module includes an inverter and is used to adjust the power component according to the frequency conversion instruction. The collection module is used to collect the detection data that changes due to the execution of the frequency conversion instruction. The detection data can be at least one of the effective current value output by the inverter and the actual operating frequency of the power component. When the change amount of the detection data before and after frequency conversion exceeds the set threshold, the main control module performs a variable parameter operation according to the operating parameter library and the actual operating frequency of the power component after frequency conversion. When the change amount of the detection data before and after frequency conversion does not exceed the set threshold, the main control module maintains the current control parameter of the power component. The process of the main control module executing the control parameter switching method has been described in detail above and will not be elaborated here.

[0079] In some embodiments, the control parameter switching system further includes a display device, which is communicatively connected to the main control module. The main control module controls the display device to display the control parameter table corresponding to the actual operating frequency of the adjusted power component and / or issue a reminder signal when the variable parameter operation is completed. In practical applications, considering that the area of the display device is generally small, the control parameter table is displayed by its corresponding serial number, such as Parameter 1, Parameter 2, etc.

[0080] It should be understood that the display device can be installed on the unit where the power component is located, or on a handheld terminal, that is, the handheld terminal is communicatively connected to the main control module of the unit, and the progress of the variable parameter operation is fed back through the display device.

[0081] The present invention also proposes an air-conditioning unit, including but not limited to a condensing unit. The air-conditioning unit has a compressor and a main control module, and the main control module controls the compressor by using the above control parameter switching method.

[0082] It should be noted that the terms used above are only for describing specific embodiments and are not intended to limit the exemplary embodiments of the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof. The terms "the previous set" and "the next set" are used to limit the parameter table to facilitate the distinction of the corresponding parameter tables.

[0083] Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0084] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. Control parameter switching method, characterized in that, It includes the following steps: Establish an operating parameter library that reflects the correspondence between the operating frequency of the power component and the control parameter table; Adjust the power component according to the frequency conversion instruction; Collect the detection data that changes due to the execution of the frequency conversion instruction; Judge whether the change amount of the detection data before and after the frequency conversion adjustment exceeds the set threshold; If so, perform a variable parameter operation according to the operating parameter library and the actual operating frequency of the power component after the frequency conversion adjustment; If not, maintain the current control parameters of the power component; Among them, performing a variable parameter operation according to the operating parameter library and the actual operating frequency of the power component after the frequency conversion adjustment includes: The operating parameter library contains at least two sets of control parameter tables set according to the operating frequency; Read the control parameter table corresponding to the actual operating frequency of the power component after the frequency conversion adjustment from the operating parameter library as the next set of parameter tables, and obtain the control parameter table of the power component before the frequency conversion adjustment as the previous set of parameter tables; Calculate and process the next set of parameter tables and the previous set of parameter tables to obtain an intermediate parameter table; Judge whether the intermediate parameter table differs from the next set of parameter tables within the set threshold range; If not, switch the current control parameters of the power component to the intermediate parameter table, use the intermediate parameter table as the previous set of parameter tables, and return to recalculate the intermediate parameter table; If so, the variable parameter operation is completed, and the next set of parameter tables is used as the previous set of parameter tables.

2. The control parameter switching method according to claim 1, wherein The detection data includes at least one of the effective current value output by the inverter to the power component and the actual operating frequency of the power component.

3. The control parameter switching method according to claim 2, wherein The detection data includes the effective current value and the actual operating frequency; the calculation method of the change amount of the detection data is: collect the effective current value output by the inverter and the actual operating frequency of the power component within two or more current cycles before and after the frequency conversion adjustment, find the maximum and minimum values of the effective current value to calculate the current change amount, and find the maximum and minimum values of the actual operating frequency to calculate the frequency change amount.

4. The control parameter switching method according to claim 3, characterized in that, Judging whether the change amount of the detection data before and after the frequency conversion adjustment exceeds the set threshold includes: Judge whether the current change amount exceeds the set current threshold or the frequency change amount exceeds the set frequency threshold; If so, it is determined that the change amount of the detection data exceeds the set threshold; If not, it is determined that the change amount of the detection data does not exceed the set threshold.

5. The control parameter switching method according to claim 1, characterized in that Each set of control parameter tables in the operating parameter library contains at least one control parameter matching the corresponding operating frequency. Judging whether the intermediate parameter table differs from the next set of parameter tables within the set threshold range includes: Calculate the absolute value of the difference between each control parameter of the intermediate parameter table and the corresponding control parameter in the next set of parameter tables; Find the maximum value among all the absolute values of the differences as the effective difference value; Judge whether the effective difference value is within the set threshold range; If so, it is determined that the intermediate parameter table differs from the next set of parameter tables within the set threshold range; If not, it is determined that the intermediate parameter table differs from the next set of parameter tables outside the set threshold range.

6. The control parameter switching method according to claim 1, characterized in that, The value of each control parameter in the intermediate parameter table is the value obtained by adding half of the corresponding control parameter in the previous parameter table and half of the corresponding control parameter in the next parameter table.

7. The control parameter switching method according to claim 1, characterized in that Before determining whether the change amount of the detected data before and after frequency conversion adjustment exceeds the set threshold, first determine whether the actual operating frequency of the power component has changed. If not, maintain the current control parameters of the power component. If so, then determine whether the change amount of the detected data before and after frequency conversion adjustment exceeds the set threshold.

8. The control parameter switching method according to claim 1, wherein Before adjusting the power component according to the frequency conversion command, first determine whether the power component has a fault. If so, execute fault protection shutdown. If not, then adjust the power component according to the frequency conversion command.

9. The control parameter switching method according to any one of claims 1 to 8, characterized in that, The power component is a compressor.

10. Control parameter switching system, characterized in that, It includes: A main control module, which is used to issue a frequency conversion command according to the operating state of the unit where the power component is located; A frequency conversion module, which is used to adjust the power component according to the frequency conversion command; An acquisition module, which is used to acquire the detected data that changes due to the execution of the frequency conversion command; When the change amount of the detected data before and after frequency conversion adjustment exceeds the set threshold, the main control module reads, from the pre-established operating parameter library that reflects the correspondence between the operating frequency of the power component and the control parameter table, the control parameter table corresponding to the actual operating frequency of the power component after frequency conversion adjustment as the next parameter table, and obtains the control parameter table of the power component before frequency conversion adjustment as the previous parameter table; Calculate and process the next parameter table and the previous parameter table to obtain an intermediate parameter table; determine whether the intermediate parameter table differs from the next parameter table by within the set threshold range; If not, switch the current control parameters of the power component to the intermediate parameter table, use the intermediate parameter table as the previous parameter table, and return to recalculate the intermediate parameter table; If so, the variable parameter operation is completed, and the next parameter table is used as the previous parameter table; When the change amount of the detected data before and after frequency conversion adjustment does not exceed the set threshold, the main control module maintains the current control parameters of the power component; Among them, the operating parameter library contains at least two sets of control parameter tables set according to the operating frequency.

11. The control parameter switching system according to claim 10, characterized in that, It includes: A display device communicatively connected to the main control module; the main control module controls the display device to display the control parameter table corresponding to the actual operating frequency of the power component after adjustment and / or issue a reminder signal when the variable parameter operation is completed.

12. Air conditioner unit, comprising: A compressor and a main control module, characterized in that the main control module controls the compressor by using the control parameter switching method according to any one of claims 1 to 9.

13. The air conditioning unit according to claim 12, characterized in that, The air-conditioning unit is a condensing unit.

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