Air conditioning unit regulation and control method and system with dynamically variable regulation period

Abstract

The invention discloses an air conditioning unit regulation and control method and system with a dynamically variable regulation period, and the regulation and control method comprises the steps: obtaining an actual value of an operation parameter representing the current operation state of an air conditioning unit, and obtaining a first regulation and control parameter based on the actual value of the operation parameter; on the basis of the first regulation and control parameter, a newest regulation period is calculated through a preset regulation formula; the operation of the air conditioning unit is regulated and controlled based on the latest regulation period; and the circulation is performed until the air conditioning unit stops running. Based on the regulation and control method, the operation stability and performance of the air conditioning unit are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of periodic regulation of air conditioning units, and particularly relates to an air conditioning unit regulation method and system with dynamically variable regulation period. BACKGROUND

[0002] In the field of air conditioning unit operation control, ensuring stable and efficient operation of the unit to meet the environmental regulation requirements under different working conditions is the core goal of regulation. In the operation control of air conditioning units, fixed period regulation to adapt to changes in the working conditions of air conditioning units is a common feature of most current regulation strategies. However, this regulation mode has exposed many problems in practical application: Firstly, in air conditioning units, the compressor is a core component, and its frequency regulation plays a key role in accurately controlling water temperature and meeting different load requirements. Currently, the common compressor frequency regulation method is usually based on water temperature PID control, and one or several fixed speeds are used to gradually adjust the unit load according to the pre-set fixed period of time, thereby realizing water temperature control. This regulation method is theoretically reasonable in that it avoids the impact on the unit caused by sudden changes in frequency by gradually adjusting the compressor frequency. However, in practical application, overloading or over-reducing frequently occurs. This is mainly due to the lack of flexibility of the fixed speed and fixed period regulation method, which cannot timely and accurately adjust the frequency according to the actual water temperature changes. When the water temperature changes rapidly, the fixed regulation speed and period cannot keep up with the water temperature change rhythm, resulting in over-regulation or under-regulation, and thus causing water temperature fluctuations, affecting the refrigeration or heating effect of the air conditioning system, and also increasing energy consumption and wear of the unit.

[0003] Secondly, in the control of electronic expansion valves, PID control with a fixed period is also generally used. Due to the hysteresis of expansion valve regulation, it takes a longer time to have corresponding changes compared with other control methods such as liquid level and suction superheat. This makes the exhaust gas superheat fluctuate greatly, and although the air conditioning unit can operate normally without alarm, its stability is very poor.

[0004] Thirdly, in the field of fan regulation control, fixed period time is also commonly used to increase or decrease frequency or approach calculation regulation. To avoid repeated regulation of the fan frequency, the regulation period is usually fixed to a large value. When the air conditioning unit has special conditions such as rapid rise of high pressure, the fan frequency cannot be adjusted in time within one regulation period, which easily causes alarm. SUMMARY

[0005] The purpose of the present application is to provide an air conditioning unit regulation method and system with dynamically variable regulation period, which can improve the operation stability and performance of air conditioning units and prevent invalid back-and-forth oscillation regulation.

[0006] To achieve the above object, the application discloses a regulating period dynamically variable air conditioning unit regulating method, comprising: An actual value of an operating parameter representing a current operating state of an air conditioning unit is obtained, and a first regulating parameter is obtained based on the actual value of the operating parameter; Based on the first regulating parameter, a latest regulating period is calculated through a preset regulating formula; The operation of the air conditioning unit is regulated based on the latest regulating period; This cycle is repeated until the air conditioning unit suspends operation.

[0007] Specifically, the regulating formula is:

[0008] Wherein, T is the latest regulating period, k is a first regulating coefficient corresponding to the operating parameter, b is a second regulating coefficient corresponding to the operating parameter, and x is the first regulating parameter; The calculation formula of the first regulating coefficient k is:

[0009] Wherein, is a preset first threshold value related to the first regulating parameter, is a first period threshold value related to the regulating period corresponding to the first threshold value, is a preset second threshold value related to the first regulating parameter, is a second period threshold value related to the regulating period corresponding to the second threshold value; The calculation formula of the second regulating coefficient b is:

[0010] Wherein, when is the first period threshold value , is the first threshold value , when is the second period threshold value , is the second threshold value .

[0011] Specifically, the regulating method further comprises a fastest regulating period and a slowest regulating period related to the operating parameter, when the latest regulating period is less than the fastest regulating period, the operation of the air conditioning unit is regulated according to the fastest regulating period; when the latest regulating period is greater than the slowest regulating period, the operation of the air conditioning unit is regulated according to the slowest regulating period.

[0012] Specifically, the operation parameter includes an outlet water temperature and / or an inlet water temperature of a refrigeration pump in the air conditioning unit, and when the operation parameter is the outlet water temperature and / or the inlet water temperature of the refrigeration pump in the air conditioning unit, the calculation step of the latest adjustment period includes: calculating a water temperature deviation value based on an actual value of the current outlet water temperature and a preset target outlet water temperature, or calculating a water temperature deviation value based on an actual value of the current inlet water temperature and a preset target inlet water temperature; calculating the first control parameter by a preset water temperature control formula based on the water temperature deviation value; calculating the latest adjustment period for controlling the compressor in the air conditioning unit based on the first control parameter and the adjustment formula.

[0013] Further, the water temperature control formula is:

[0014] wherein t represents t time, u(t) is the first control parameter at t time, e(t) is the water temperature deviation value at t time, is a preset first control coefficient, is a preset second control coefficient, is a preset third control coefficient.

[0015] Further, before calculating the first control parameter, the calculation step of the latest adjustment period further includes: judging whether an absolute value of the water temperature deviation value is greater than a preset water temperature deviation threshold value, if yes, calculating the first control parameter by the water temperature control formula based on the water temperature deviation value, and if no, stopping the calculation until the absolute value of the water temperature deviation value is greater than the water temperature deviation threshold value.

[0016] Specifically, the operation parameter includes an outlet water temperature and / or an inlet water temperature of a refrigeration pump in the air conditioning unit, and when the operation parameter is the outlet water temperature and / or the inlet water temperature of the refrigeration pump in the air conditioning unit, the calculation step of the latest adjustment period includes: calculating a water temperature deviation value based on an actual value of the current outlet water temperature and a preset target outlet water temperature, or calculating a water temperature deviation value based on an actual value of the current inlet water temperature and a preset target inlet water temperature; calculating the latest adjustment period for controlling the compressor in the air conditioning unit based on the first control parameter and the adjustment formula.

[0017] Further, the water temperature control formula is:

[0018] Where t represents time t, and u(t) is the actual value of the exhaust superheat at time t. Let be the exhaust temperature at time t. The saturation temperature at time t, obtained based on the current exhaust pressure.

[0019] Specifically, the operating parameters include the condensing temperature of the air conditioning unit. When the operating parameter is the condensing temperature, the calculation steps for the latest adjustment cycle include: Based on the actual value of the current condensing temperature and the preset target condensing temperature, the condensing temperature deviation value is calculated, and the absolute value of the condensing temperature deviation value is the first control parameter. The latest adjustment cycle for regulating the condenser fan of the air conditioning unit is obtained by calculating based on the first regulation parameter and the regulation formula.

[0020] Furthermore, when the operating parameters include the outlet water temperature and the inlet water temperature, the control method also includes a method for controlling the chilled water pump, the steps of which include: Based on the actual values ​​of the current outlet water temperature and the inlet water temperature, the actual value of the inlet and outlet water temperature difference is calculated. Based on the target effluent temperature and the target influent temperature, the target value of the influent-effluent temperature difference is calculated. Based on the actual and target values ​​of the inlet and outlet water temperature difference, the inlet and outlet water temperature difference deviation value is calculated, and the absolute value of the inlet and outlet water temperature difference deviation value is the first control parameter. The latest adjustment cycle for regulating the refrigeration pump is obtained by calculating based on the first control parameter and the control formula.

[0021] Furthermore, the method for controlling the refrigeration pump also includes: Based on the latest adjustment cycle for regulating the compressor and the latest adjustment cycle for regulating the refrigeration pump, the final adjustment cycle of the refrigeration pump is calculated using a preset final adjustment cycle formula for the refrigeration pump, and the refrigeration pump is regulated based on the final adjustment cycle of the refrigeration pump. The formula for the final adjustment cycle of the refrigeration pump is:

[0022] in, The latest adjustment cycle is used to regulate the compressor. The preset compressor influence coefficient, The latest adjustment cycle is used to regulate the refrigeration pump. This is the final adjustment cycle of the refrigeration pump.

[0023] The application further discloses a regulating period dynamically variable air conditioning unit regulation and control system.

[0024] The application further discloses a regulating period dynamically variable air conditioning unit regulation and control system, which comprises: one or more processors; a memory; and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, and the programs comprise instructions for executing the regulation and control method.

[0025] The application further discloses a computer readable storage medium, which comprises a computer program that can be executed by a processor to complete the regulation and control method.

[0026] Compared with the prior art, the regulation period dynamically variable air conditioning unit regulation and control method has advantages in improving the operation stability and performance of the air conditioning unit, and the method determines the first regulation and control parameter by obtaining the actual value of the operation parameter representing the current operation state of the air conditioning unit, and then calculates the latest regulation period by using a preset regulation formula, and realizes flexible regulation and control of the operation of the unit based on the period, which is more adaptive to the operation state of the air conditioning unit. The method breaks the limitation of the traditional fixed regulation period, can flexibly adjust the regulation period according to the real-time operation state of the unit, can shorten the regulation period when the operation state of the unit changes greatly, makes the regulation and control more timely and accurate, quickly responds to the working condition change, effectively avoids the over-regulation or under-regulation phenomenon, improves the operation stability and efficiency of the unit, and when the operation state of the unit is relatively stable, appropriately prolongs the regulation period, reduces unnecessary regulation operation, reduces equipment wear and energy consumption, prolongs the service life of the unit, and at the same time, the dynamically variable period control can also reduce the operation burden of the control system, improve the overall control performance, and realize the optimal operation of the air conditioning unit under different working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 The figure is a flowchart of the regulation period dynamically variable air conditioning unit regulation and control method in the embodiment of the application.

[0028] Figure 2 The figure is a flowchart of the regulation period dynamically variable air conditioning unit regulation and control method in another embodiment of the application.

[0029] Figure 3 The figure is a regulation schematic diagram of the regulation period dynamically variable air conditioning unit regulation and control method in the embodiment of the application.

[0030] Figure 4Flow chart of the calculation step of the latest regulation period for regulating the compressor in the embodiment of the present application.

[0031] Figure 5 Flow chart of the calculation step of the latest regulation period for regulating the compressor in another embodiment of the present application.

[0032] Figure 6 Flow chart of the calculation step of the latest regulation period for regulating the expansion valve in the embodiment of the present application.

[0033] Figure 7 Flow chart of the calculation step of the latest regulation period for regulating the condenser fan in the embodiment of the present application.

[0034] Figure 8 Flow chart of the calculation step of the latest regulation period for regulating the refrigeration pump in the embodiment of the present application.

[0035] Figure 9 Flow chart of the calculation step of the final regulation period for regulating the refrigeration pump in another embodiment of the present application. DETAILED DESCRIPTION

[0036] To make the technical content, structural features, achieved purposes and effects of the present application clear, the following will be described in detail in combination with the embodiments and the accompanying drawings.

[0037] The embodiment of the present application discloses an air conditioning unit regulating method with dynamically variable regulation period to improve the operation stability and performance of the air conditioning unit. Referring to Figure 1 The regulating method specifically includes the following steps: S1: obtaining the actual value of the operation parameter representing the current operation state of the air conditioning unit, and obtaining the first regulating parameter based on the actual value of the operation parameter. In the embodiment, the operation parameter of the air conditioning unit refers to the parameters commonly used in the regulating process of the air conditioning unit, such as outlet water temperature, inlet water temperature, condensing temperature and exhaust superheat, etc.

[0038] S2: obtaining the latest regulation period through the preset regulation formula based on the first regulating parameter.

[0039] S3: regulating the operation of the air conditioning unit based on the latest regulation period.

[0040] S4: judging whether the air conditioning unit is suspended, if yes, jumping to step S5, if not, returning to step S1.

[0041] S5: ending the operation of the present regulating method.

[0042] Compared with the prior art, the air conditioning unit regulation and control method provided by the above technical solution of the present application has advantages in improving the operation stability and performance of the air conditioning unit. The method determines the first control parameter by obtaining the actual value of the operation parameter representing the current operation state of the air conditioning unit, and then calculates the latest regulation period by using a preset regulation formula, and based on this period, the operation of the unit is flexibly and more adaptively regulated. The method breaks the limitation of the traditional fixed regulation period, can flexibly adjust the regulation period according to the real-time operation state of the unit, can shorten the regulation period when the operation state of the unit changes greatly, makes the regulation more timely and accurate, quickly responds to the working condition changes, effectively avoids over-regulation or under-regulation phenomenon, improves the operation stability and efficiency of the unit; when the operation state of the unit is relatively stable, the regulation period is appropriately lengthened, unnecessary regulation operations are reduced, equipment wear and energy consumption are reduced, and the service life of the unit is prolonged. At the same time, the dynamically variable period control can also reduce the operation burden of the control system, improve the overall control performance, and realize the optimal operation of the air conditioning unit under different working conditions.

[0043] Specifically, referring to Figure 2 The regulation and control method further comprises: S1: obtaining the actual value of the operation parameter representing the current operation state of the air conditioning unit, and obtaining the first control parameter based on the actual value of the operation parameter.

[0044] S2: based on the first control parameter, the latest regulation period is calculated by using a preset regulation formula.

[0045] In this embodiment, the regulation and control method further comprises the fastest regulation period and the slowest regulation period related to the operation parameter. When the latest regulation period is less than the fastest regulation period, the operation of the air conditioning unit is regulated according to the fastest regulation period; when the latest regulation period is greater than the slowest regulation period, the operation of the air conditioning unit is regulated according to the slowest regulation period, that is: S21: determining whether the latest regulation period is less than the fastest regulation period, if yes, jumping to step S22, if no, jumping to step S23.

[0046] S22: regulating the operation of the air conditioning unit according to the fastest regulation period, and jumping to step S4.

[0047] S23: determining whether the latest regulation period is greater than the slowest regulation period, if yes, jumping to step S24, if no, jumping to step S3.

[0048] S24: regulating the operation of the air conditioning unit according to the slowest regulation period, and jumping to step S4.

[0049] Specifically, the above regulation formula is:

[0050] Where T is the latest adjustment cycle, k is the first adjustment coefficient corresponding to the operating parameters, b is the second adjustment coefficient corresponding to the operating parameters, and x is the first control parameter; The formula for calculating the first adjustment coefficient k is:

[0051] in, The first threshold value is a preset value related to the first control parameter. This is the first period threshold related to the adjustment period, corresponding to the first threshold. The second threshold is a preset value related to the first control parameter. This is the second cycle threshold related to the adjustment cycle, corresponding to the second threshold. The formula for calculating the second adjustment coefficient b is:

[0052] Among them, when The threshold for the first period hour, The first threshold ,when The threshold for the second period hour, The second threshold .

[0053] Specifically, see Figure 3 As shown, the following will elaborate on how the latest adjustment cycle is calculated in this control method from three aspects: the outlet water temperature and / or inlet water temperature of the chilled water pump in the air conditioning unit (corresponding to the adjustment cycle and control of the compressor and chilled water pump), the exhaust superheat (corresponding to the cycle and control of the expansion valve), and the condensing temperature (corresponding to the adjustment cycle and control of the condenser fan). (a) Calculation of the latest adjustment cycle of the compressor When the operating parameters are the outlet water temperature and / or inlet water temperature of the chilled water pump in the air conditioning unit, they correspond to the calculation of the latest adjustment cycle of the compressor. (See [link to relevant documentation]). Figure 4 As shown, the calculation steps for the latest adjustment cycle used to regulate compression include: SA1: Calculate the water temperature deviation value based on the actual value of the current outlet water temperature and the preset target outlet water temperature, or: Calculate the water temperature deviation value based on the actual value of the current inlet water temperature and the preset target inlet water temperature.

[0054] In the present example, when one of the obtained operating parameters is the outlet water temperature or the inlet water temperature, a water temperature deviation value is calculated based on the actual value and the preset target value of the outlet water temperature or the inlet water temperature, and if both of the operating parameters are included, the calculation of the water temperature deviation value is performed by selecting one of them. It is worth mentioning that the deviation value herein generally refers to the difference between the actual value and the target value.

[0055] SA2: Based on the water temperature deviation value, a first control parameter is calculated by a preset water temperature control formula.

[0056] SA3: Based on the first control parameter and a regulation formula, a latest regulation period for regulating the compressor in the air conditioning unit is calculated.

[0057] Specifically, in the present embodiment, the first control parameter in the period calculation step of the compressor is the PID value of the outlet water temperature or the return water temperature, and the water temperature control formula for calculating the PID value is:

[0058] wherein t represents the time t, u(t) is the first control parameter at time t, e(t) is the water temperature deviation value at time t, is a preset first control coefficient, is a preset second control coefficient, is a preset third control coefficient. In the present embodiment, the first control coefficient , the second control coefficient and the third control coefficient are set based on the actual use conditions such as the size of the air conditioning unit, and the PID value is usually selected in the range of [-1000, 1000].

[0059] Referring to FIG. 1, Figure 5 Further, before calculating the first control parameter, an update condition of the latest regulation period of the compressor is further included, which is specifically: SA1: Based on the actual value of the current outlet water temperature and the preset target outlet water temperature, a water temperature deviation value is calculated, or: based on the actual value of the current inlet water temperature and the preset target inlet water temperature, a water temperature deviation value is calculated.

[0060] SA11: It is judged whether the absolute value of the water temperature deviation value is greater than a preset water temperature deviation threshold value, if yes, it is jumped to step SA2, if not, it is returned to step SA1. In the present embodiment, the water temperature deviation threshold value is preferably 0.5, and can be further adjusted to 0.3.

[0061] The following takes a specific embodiment as an example to explain the calculation step of the latest regulation period of the compressor, which is specifically: Table 1: Parameter setting table of the latest regulation period of the compressor

[0062] (1) When the PID value is less than or equal to the "start to execute the load reduction PID value" (preferably -150), the load reduction is started to be executed, and after the load reduction is completed, if the PID value is between the "start to execute the load reduction PID value" and the "start to execute the load PID value" (preferably 150), the current frequency and the adjustment period are maintained; if the PID value is less than the "start to execute the load reduction PID value", the load reduction is continuously executed.

[0063] In the load reduction process, the "start to execute the load reduction PID value" is taken as the first threshold value, the "slowest adjustment period" corresponding to the first threshold value is taken as the first period threshold value, the "minimum value of the PID value" is taken as the second threshold value, the "fastest adjustment period" corresponding to the second threshold value is taken as the second period threshold value, and the calculation formula of the first adjustment coefficient k and the second adjustment coefficient b is obtained.

[0064]

[0065] The adjustment formula in the load reduction process of the compressor is:

[0066] Suppose that the current first control parameter (PID value) is -300, the above formula is substituted to obtain that in the current load reduction process, the latest adjustment period is about 17.4s.

[0067] (2) When the PID value is greater than or equal to the "start to execute the load PID value" (preferably 150), the load is started to be executed, and after the load is completed, if the PID value is between the "start to execute the load reduction PID value" and the "start to execute the load PID value", the current frequency and the adjustment period are maintained; if the PID value is greater than 150, the load is continuously executed.

[0068] In the load process, the "start to execute the load PID value" is taken as the first threshold value, the "slowest adjustment period" corresponding to the first threshold value is taken as the first period threshold value, the "maximum value of the PID value" is taken as the second threshold value, the "fastest adjustment period" corresponding to the second threshold value is taken as the second period threshold value, and the calculation formula of the first adjustment coefficient k and the second adjustment coefficient b is obtained.

[0069]

[0070] The adjustment formula in the load process of the compressor is:

[0071] Suppose the current first control parameter (PID value) is 300, and substitute it into the above formula to calculate the latest adjustment period of the expansion valve in the current loading process, which is about 22.4s.

[0072] (II) Calculation of the latest adjustment period of the expansion valve Referring to Figure 6 When the operating parameter is the exhaust gas superheat degree, the calculation steps of the latest adjustment period include: SB1: Based on the actual value of the current exhaust gas superheat degree and the preset target exhaust gas superheat degree, the exhaust gas superheat degree deviation value is calculated, and the absolute value of the exhaust gas superheat degree deviation value is the first control parameter.

[0073] SB2: Based on the first control parameter and the adjustment formula, the latest adjustment period of the expansion valve for regulating the air conditioning unit is calculated.

[0074] Further, the calculation formula of the exhaust gas superheat degree is:

[0075] Where t represents t time, u(t) is the actual value of the exhaust gas superheat degree at t time, is the exhaust gas temperature at t time, is the saturation temperature at t time, which is obtained according to the current exhaust gas pressure.

[0076] The following takes a specific embodiment as an example to illustrate the calculation steps of the latest adjustment period of the expansion valve, specifically: Table 2: Latest adjustment period parameter setting table of the expansion valve

[0077] Taking the "first control parameter minimum value" as the first threshold value, the corresponding "expansion valve slowest adjustment period" is the first period threshold value, and taking the "first control parameter maximum value" as the second threshold value, the corresponding "expansion valve fastest adjustment period" is the second period threshold value. Substituting the calculation formula of the first adjustment coefficient k and the second adjustment coefficient b, we get:

[0078]

[0079] The adjustment formula is:

[0080] Suppose the current first control parameter is 3.5, and substitute it into the above formula to calculate the latest adjustment period of the expansion valve, which is about 3.9s.

[0081] (III) Calculation of the latest adjustment period of the condenser fan Referring to Figure 7 As shown in FIG. 2, when the operating parameter is the condensing temperature, the calculation steps of the latest adjustment period include: SC1: based on the actual value of the current condensing temperature and the preset target condensing temperature, a condensing temperature deviation value is calculated, and the absolute value of the condensing temperature deviation value is the first control parameter.

[0082] SC2: based on the first control parameter and the adjustment formula, the latest adjustment period for regulating the condenser fan of the air conditioning unit is calculated.

[0083] The following takes a specific example to illustrate the calculation steps of the latest adjustment period for the expansion valve, specifically: Table 3: Latest adjustment period parameter setting table for condenser fan

[0084] Taking the "first control parameter minimum value" as the first threshold value, its corresponding "condenser fan slowest adjustment period" is the first period threshold value, and taking the "first control parameter maximum value" as the second threshold value, its corresponding "condenser fan fastest adjustment period" is the second period threshold value, and substituting the calculation formula of the first adjustment coefficient k and the second adjustment coefficient b, that is:

[0085]

[0086] The adjustment formula is:

[0087] Assuming that the current first control parameter is 5, substituting the above formula, the latest adjustment period of the expansion valve can be calculated to be about 5.2s.

[0088] (Four) Calculation of the latest adjustment period for the refrigeration pump Referring to Figure 8 As shown in FIG. 2, when the operating parameter is the condensing temperature, the calculation steps of the latest adjustment period include: SD1: based on the actual value of the current condensing temperature and the preset target condensing temperature, a condensing temperature deviation value is calculated, and the absolute value of the condensing temperature deviation value is the first control parameter.

[0089] SD2: based on the target outlet water temperature and the target inlet water temperature, a target value of the inlet and outlet water temperature difference is calculated.

[0090] SD3: based on the actual value and the target value of the inlet and outlet water temperature difference, a deviation value of the inlet and outlet water temperature difference is calculated, and the absolute value of the deviation value of the inlet and outlet water temperature difference is the first control parameter.

[0091] SD4: based on the first control parameter and the adjustment formula, the latest adjustment period for regulating the refrigeration pump is calculated.

[0092] The following specific embodiment illustrates the calculation steps for the latest adjustment cycle of the chilled pump, specifically: Table 4 Latest Adjustment Cycle Parameter Setting Table for Refrigeration Pumps

[0093] Using the minimum value of the first control parameter as the first threshold, and its corresponding slowest adjustment cycle of the chiller pump as the first cycle threshold, and then using the maximum value of the first control parameter as the second threshold, and its corresponding fastest adjustment cycle of the chiller pump as the second cycle threshold, substituting these values ​​into the calculation formulas for the first control coefficient k and the second control coefficient b, we obtain:

[0094]

[0095] The adjustment formula is:

[0096] Assuming the current first control parameter is 3, substituting it into the above formula, the latest adjustment cycle of the expansion valve can be calculated to be approximately 7.5s.

[0097] Furthermore, since the operation of the refrigeration pump and the compressor are closely related, their adjustment cycles are often considered together in practice. (See [reference needed]). Figure 9 As shown, the control methods for refrigeration pumps also include: SD5: Based on the latest adjustment cycle used to regulate the compressor and the latest adjustment cycle used to regulate the refrigeration pump, the final adjustment cycle of the refrigeration pump is calculated using a preset formula for the final adjustment cycle of the refrigeration pump.

[0098] SD6: Regulates the chilled pump based on its final adjustment cycle.

[0099] The formula for the final adjustment cycle of the refrigeration pump is:

[0100] in, To be used to adjust the latest adjustment cycle of the compressor, The preset compressor influence coefficient, To adjust the latest adjustment cycle of the refrigeration pump, This is the final adjustment cycle for the refrigeration pump. When the compressor is loaded, the refrigeration pump is also loaded, and the compressor influence coefficient is preferably 65%; when the compressor is unloaded, the refrigeration pump is also unloaded, and the compressor influence coefficient is preferably 25%.

[0101] It should be noted that in the above four embodiments, the purposes of taking the "fastest adjustment period" and "slowest adjustment period" as the first period threshold and the second period threshold are only for better illustration effect, and the actual "first threshold", "second threshold", "first period threshold" and "second period threshold" can be any two points on the mathematical model of the adjustment formula. When the calculated latest adjustment period is greater than the "slowest adjustment period" or is less than the "fastest adjustment period", the selection judgment is made based on the method shown in the formula (1). Figure 2

[0102] In summary, in terms of compressor regulation: the dynamic variable adjustment period improves the air conditioning unit water temperature control accuracy, can effectively reduce the invalid adjustment of the unit, improves the energy efficiency of the unit, the speed of the compressor adjustment frequency combined with the water temperature calculation PID, makes the compressor operation adjustment period time adaptive to the change of water temperature, makes the water temperature regulation more accurate and reduces unnecessary conditions, makes the water temperature control more stable and improves the customer experience.

[0103] In terms of expansion valve regulation, the control method can solve the instability caused by hysteresis and prevent a series of problems caused by expansion valve fluctuation.

[0104] In terms of condenser fan, under the condition of ensuring control accuracy, the variable adjustment period can quickly respond to the adjustment control when special conditions occur, and prevent alarm.

[0105] The application also discloses an air conditioning unit regulation system with a dynamic variable adjustment period, which works based on the regulation method described above.

[0106] The application also discloses another air conditioning unit regulation system with a dynamic variable adjustment period, which comprises one or more processors, a memory and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the programs comprise instructions for executing the regulation method described above. The processor can adopt a general central processing unit (CPU), a microprocessor, an application specific integrated circuit (ASIC), or one or more integrated circuits for executing related programs to realize the functions required by the modules in the regulation system of the embodiments of the application, or execute the regulation method of the method embodiments of the application.

[0107] ​The application also discloses a computer readable storage medium comprising a computer program, which can be executed by a processor to complete the regulation method as described above. The computer readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center and the like integrated with one or more available media. The available medium can be a read-only memory (ROM), or a random access memory (RAM), or a magnetic medium, for example, a floppy disk, a hard disk, a magnetic tape, a magnetic disc, or an optical medium, for example, a digital versatile disc (DVD), or a semiconductor medium, for example, a solid state disk (SSD) and the like.

[0108] The above only discloses preferred embodiments of the application, and of course cannot limit the scope of the patent right of the application, so equivalent changes made in the patent application scope of the application still fall within the scope of the application.

Claims

1. A method for controlling an air conditioning unit with a dynamically variable adjustment cycle, characterized in that, The method comprises: acquiring an actual value of an operating parameter representing a current operating state of an air conditioning unit, and acquiring a first regulation parameter based on the actual value of the operating parameter; calculating a latest regulation period based on the first regulation parameter through a preset regulation formula; regulating the operation of the air conditioning unit based on the latest regulation period; repeating the above steps until the air conditioning unit suspends operation.

2. The method of claim 1, wherein the method further comprises: The regulation formula is: wherein T is the latest regulation period, k is a first regulation coefficient corresponding to the operating parameter, b is a second regulation coefficient corresponding to the operating parameter, and x is the first regulation parameter; the calculation formula of the first regulation coefficient k is: wherein, is a first threshold value related to the first control parameter preset, is a first period threshold value related to the adjustment period corresponding to the first threshold value, is a second threshold value related to the first control parameter preset, is a second period threshold value related to the adjustment period corresponding to the second threshold value; the calculation formula of the second regulation coefficient b is: wherein, when the first periodic threshold is the first threshold when the second periodic threshold is the second threshold .

3. The method of claim 1, wherein the method further comprises: The regulation method further comprises a fastest regulation period and a slowest regulation period related to the operating parameter, and when the latest regulation period is less than the fastest regulation period, the operation of the air conditioning unit is regulated according to the fastest regulation period; when the latest regulation period is greater than the slowest regulation period, the operation of the air conditioning unit is regulated according to the slowest regulation period.

4. The method of claim 1, wherein the method further comprises: The operating parameter comprises the outlet water temperature and / or the inlet water temperature of a refrigeration pump in the air conditioning unit, and when the operating parameter is the outlet water temperature and / or the inlet water temperature of the refrigeration pump in the air conditioning unit, the calculation step of the latest regulation period comprises: calculating a water temperature deviation value based on the actual value of the current outlet water temperature and a preset target outlet water temperature, or calculating a water temperature deviation value based on the actual value of the current inlet water temperature and a preset target inlet water temperature; calculating the first regulation parameter through a preset water temperature control formula based on the water temperature deviation value; calculating the latest regulation period for regulating the compressor in the air conditioning unit based on the first regulation parameter and the regulation formula.

5. The method of claim 4, wherein the method further comprises: The water temperature control formula is: Wherein, t represents t moment, u(t) is the first control parameter at t moment, e(t) is the water temperature deviation value at t moment, is a preset first control coefficient, is a preset second control coefficient, is a preset third control coefficient.

6. The method of claim 4, wherein the method further comprises: Before calculating the first regulation parameter, the calculation step of the latest regulation period further comprises: determining whether the absolute value of the water temperature deviation value is greater than a preset water temperature deviation threshold value, and if yes, calculating the first regulation parameter through the water temperature control formula based on the water temperature deviation value, and if no, stopping the calculation until the absolute value of the water temperature deviation value is greater than the water temperature deviation threshold value.

7. The method of claim 1, wherein the method further comprises: The operating parameter comprises the exhaust gas superheat degree of the air conditioning unit, and when the operating parameter is the exhaust gas superheat degree, the calculation step of the latest regulation period comprises: calculating an exhaust gas superheat degree deviation value based on the actual value of the current exhaust gas superheat degree and a preset target exhaust gas superheat degree, and the absolute value of the exhaust gas superheat degree deviation value is the first regulation parameter; calculating the latest regulation period for regulating the expansion valve of the air conditioning unit based on the first regulation parameter and the regulation formula.

8. The method of claim 7, wherein the method further comprises: The calculation formula of the exhaust gas superheat degree is: wherein t denotes the time t, u(t) is the actual value of the exhaust gas superheat at the time t, is the exhaust gas temperature at the time t, is the saturation temperature at the time t, which is obtained from the current exhaust gas pressure.

9. The method of claim 1, wherein the method further comprises: The operating parameter comprises the condensing temperature of the air conditioning unit, and when the operating parameter is the condensing temperature, the calculation step of the latest regulation period comprises: calculating a condensing temperature deviation value based on the actual value of the current condensing temperature and the preset target condensing temperature, the absolute value of the condensing temperature deviation value being the first regulation parameter; calculating based on the first regulation parameter and the regulation formula to obtain the latest regulation period for regulating the condenser fan of the air conditioning unit.

10. The method of claim 4, wherein the air conditioning unit is a variable air volume (VAV) unit. When the operating parameters include the outlet water temperature and the inlet water temperature, the regulation method further includes a regulation method for the refrigeration pump, the steps of which include: calculating an actual value of the inlet and outlet water temperature difference based on the actual values of the current outlet water temperature and the current inlet water temperature; calculating a target value of the inlet and outlet water temperature difference based on the target outlet water temperature and the target inlet water temperature; calculating an inlet and outlet water temperature difference deviation value based on the actual value and the target value of the inlet and outlet water temperature difference, the absolute value of the inlet and outlet water temperature difference deviation value being the first regulation parameter; calculating based on the first regulation parameter and the regulation formula to obtain the latest regulation period for regulating the refrigeration pump.

11. The method of claim 10, wherein the method further comprises: The regulation method for the refrigeration pump further includes: calculating a final regulation period for the refrigeration pump based on the latest regulation period for regulating the compressor and the latest regulation period for regulating the refrigeration pump through a preset final regulation period formula for the refrigeration pump, and regulating the refrigeration pump based on the final regulation period for the refrigeration pump; the final regulation period formula for the refrigeration pump is: wherein, is the latest regulation period for regulating the compressor, is a preset compressor influence coefficient, is the latest regulation period for regulating the freezing pump, is the final regulation period for the freezing pump.

12. A control system for an air conditioning unit with a dynamically variable adjustment cycle, characterized in that, The air conditioning unit regulation system with dynamically variable regulation period works based on the regulation method of any one of claims 1 to 11.

13. A control system for an air conditioning unit with a dynamically variable adjustment cycle, characterized in that, comprise: one or more processors; a memory; and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the programs including instructions for executing the regulation method of any one of claims 1 to 11.

14. A computer-readable storage medium, characterized in that, comprise a computer program executable by a processor to complete the regulation method of any one of claims 1 to 11.

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