Air conditioning control method, device and air conditioning system

Abstract

The present invention relates to an air conditioning control method, device and air conditioning system, wherein the air conditioning control method comprises: obtaining the operating status data of a fixed frequency unit and a variable frequency unit in the air conditioning system; determining the operating unit in the air conditioning system according to the operating status data, the operating unit comprises a fixed frequency unit, or a combination of a fixed frequency unit and the variable frequency unit; obtaining the opening of a flow regulating device in the operating unit; adjusting the operating load rate of the operating unit according to the operating status data and the opening of the flow regulating device. The embodiment of the present application can control the fixed frequency unit and the variable frequency unit separately, so that the operating load rate of the operating unit (fixed frequency unit, or a combination of a fixed frequency unit and a variable frequency unit) reaches a higher energy efficiency, and can effectively give play to the advantages of the fixed frequency unit and the variable frequency unit, so as to achieve the purpose of improving the overall operating energy efficiency.

Description

Technical Field

[0001] The present application relates to the field of air conditioning technology, and in particular to an air conditioning control method, device and air conditioning system. Background Art

[0002] In medium- to large-scale cooling projects, the parallel operation of multiple chillers has become widely used. This approach can better adapt to load fluctuations, especially for cooling projects with a fixed base load that also needs to accommodate load fluctuations. Refrigeration rooms are typically designed with a combination of fixed-frequency and variable-frequency chillers. The fixed-frequency chillers maintain the system's regular base load, while the variable-frequency chillers handle peak load control. This approach reduces initial project investment and achieves significant energy savings during actual operation.

[0003] Currently, refrigeration systems with a fixed-variable frequency combination typically utilize a one-to-one system control system for the main unit and chiller pump. The chiller pump typically utilizes full variable frequency or a fixed variable frequency system that matches the fixed variable frequency configuration of the chiller unit. Full variable frequency pumps utilize synchronous frequency control, while only the variable frequency pump in a fixed variable frequency combination utilizes variable frequency control. Based on the performance curve trends of the refrigeration units, fixed frequency units achieve maximum efficiency when the load factor is near full load; variable frequency units typically achieve maximum efficiency at a load factor between 50% and 80%. Due to factors such as pump control methods and hydraulic balance, fixed frequency and variable frequency units generally operate at the same load factor. This results in the fixed frequency unit not operating at near full load during actual operation, and the loads of the fixed frequency and variable frequency units remain similar. This leads to low system efficiency and high energy consumption, failing to meet energy conservation requirements. Summary of the Invention

[0004] In order to understand the technical problems that determine the low energy efficiency, high energy consumption and inability to meet energy-saving requirements of the refrigeration system using a variable frequency combination mode, the present application provides an air-conditioning control method, device and air-conditioning system.

[0005] In a first aspect, the present application provides an air conditioning control method, comprising:

[0006] Obtain operating status data of fixed-frequency units and variable-frequency units in the air-conditioning system;

[0007] Determining an operating unit in the air-conditioning system according to the operating status data, the operating unit including a fixed-frequency unit, or a combination of a fixed-frequency unit and the variable-frequency unit;

[0008] Obtaining the opening of a flow regulating device in the operating unit;

[0009] The operating load rate of the operating unit is adjusted according to the operating status data and the opening of the flow regulating device.

[0010] Optionally, adjusting the operating load rate of the operating unit according to the operating status data and the opening of the flow regulating device includes:

[0011] Determining, according to the operating status data, the number of fixed-frequency units in the air-conditioning system in fixed-frequency operation, the fixed-frequency water pump frequency of the water pumps in the fixed-frequency units, the number of variable-frequency units in variable-frequency operation, and the variable-frequency water pump frequency of the water pumps in the variable-frequency units;

[0012] The operating load rate of the operating unit is adjusted according to the fixed-frequency operation quantity, the variable-frequency operation quantity, the fixed-frequency water pump frequency, the variable-frequency water pump frequency and the opening of the flow regulating device.

[0013] Optionally, adjusting the operating load rate of the operating unit according to the fixed-frequency operation number, the variable-frequency operation number, the fixed-frequency water pump frequency, the variable-frequency water pump frequency, and the opening of the flow regulating device includes:

[0014] Determining whether the fixed-frequency operation quantity is greater than the variable-frequency operation quantity;

[0015] In a case where the fixed-frequency operation quantity is greater than the variable-frequency operation quantity, determining whether a first opening degree of a flow regulating device in the fixed-frequency unit is greater than a first preset opening degree threshold;

[0016] If the first opening is greater than a first preset opening threshold, determining whether a second opening of the flow regulating device in the variable frequency unit is greater than the first preset opening threshold;

[0017] If the second opening is greater than the first preset opening threshold, the end flag is set to position 1, and the operating load rate is not adjusted.

[0018] Optionally, adjusting the operating load rate of the operating unit according to the fixed-frequency operation quantity, the variable-frequency operation quantity, the fixed-frequency water pump frequency, the variable-frequency water pump frequency, and the opening of the flow regulating device further includes:

[0019] If the second opening is less than or equal to the first preset opening threshold, performing a frequency increase operation on the water pump in the frequency conversion unit;

[0020] Delaying the first preset time period, re-performing the step of determining whether the first opening of the flow regulating device in the fixed-frequency unit is greater than the first preset opening threshold.

[0021] Optionally, adjusting the operating load rate of the operating unit according to the fixed-frequency operation quantity, the variable-frequency operation quantity, the fixed-frequency water pump frequency, the variable-frequency water pump frequency, and the opening of the flow regulating device further includes:

[0022] If the first opening is less than or equal to the first preset opening threshold, determining whether the frequency of the fixed-frequency water pump is greater than a first preset frequency threshold;

[0023] If the fixed-frequency water pump frequency is greater than the first preset frequency threshold, determining whether the variable-frequency water pump frequency is less than a second preset frequency threshold;

[0024] If the frequency of the variable frequency water pump is less than the second preset frequency threshold, the flag position 1 is not adjusted, and the operating load rate is not adjusted.

[0025] Optionally, adjusting the operating load rate of the operating unit according to the fixed-frequency operation quantity, the variable-frequency operation quantity, the fixed-frequency water pump frequency, the variable-frequency water pump frequency, and the opening of the flow regulating device further includes:

[0026] If the frequency of the variable frequency water pump is greater than or equal to the second preset frequency threshold, the water pump in the variable frequency unit is subjected to a frequency reduction operation, the first preset time period is delayed, and the step of determining whether the first opening of the flow regulating device in the fixed frequency unit is greater than the first preset opening threshold is re-executed.

[0027] Optionally, adjusting the operating load rate of the operating unit according to the fixed-frequency operation quantity, the variable-frequency operation quantity, the fixed-frequency water pump frequency, the variable-frequency water pump frequency, and the opening of the flow regulating device further includes:

[0028] If the frequency of the fixed-frequency water pump is less than or equal to a first preset frequency threshold, performing a frequency increase operation on the water pump of the fixed-frequency unit;

[0029] Delaying the first preset time period, re-performing the step of determining whether the first opening of the flow regulating device in the fixed-frequency unit is greater than the first preset opening threshold.

[0030] Optionally, adjusting the operating load rate of the operating unit according to the fixed-frequency operation quantity, the variable-frequency operation quantity, the fixed-frequency water pump frequency, the variable-frequency water pump frequency, and the opening of the flow regulating device further includes:

[0031] When the fixed-frequency operation quantity is less than or equal to the variable-frequency operation quantity, determining whether the second opening degree of the flow regulating device in the variable-frequency unit is greater than the first preset opening degree threshold;

[0032] If the second opening is greater than the first preset opening threshold, determining whether the first opening of the flow regulating device in the fixed-frequency unit is greater than the first preset opening threshold;

[0033] If the first opening is greater than the first preset opening threshold, the end flag is set to position 1, and the operating load rate is not adjusted.

[0034] Optionally, adjusting the operating load rate of the operating unit according to the fixed-frequency operation quantity, the variable-frequency operation quantity, the fixed-frequency water pump frequency, the variable-frequency water pump frequency, and the opening of the flow regulating device further includes:

[0035] If the first opening is less than or equal to the first preset opening threshold, determining whether the second opening is less than a third preset opening threshold;

[0036] If the second opening is less than the third preset opening threshold, the flag position 1 is not adjusted, and the operating load rate is not adjusted.

[0037] Optionally, adjusting the operating load rate of the operating unit according to the fixed-frequency operation quantity, the variable-frequency operation quantity, the fixed-frequency water pump frequency, the variable-frequency water pump frequency, and the opening of the flow regulating device further includes:

[0038] If the second opening is greater than or equal to the third preset opening threshold, performing a frequency increase operation on the water pump in the fixed-frequency unit;

[0039] Delaying the first preset time period, re-performing the step of determining whether the fixed-frequency operation quantity is greater than the variable-frequency operation quantity.

[0040] Optionally, adjusting the operating load rate of the operating unit according to the fixed-frequency operation quantity, the variable-frequency operation quantity, the fixed-frequency water pump frequency, the variable-frequency water pump frequency, and the opening of the flow regulating device further includes:

[0041] If the second opening is less than or equal to the first preset opening threshold, determining whether the frequency of the fixed-frequency water pump is greater than a first preset frequency threshold;

[0042] If the frequency of the fixed-frequency water pump is less than or equal to the first preset frequency threshold, performing an upgrade operation on the water pump of the fixed-frequency unit;

[0043] Delaying a first preset period, re-performing the step of determining whether the fixed-frequency operation quantity is greater than the variable-frequency operation quantity.

[0044] Optionally, adjusting the operating load rate of the operating unit according to the fixed-frequency operation quantity, the variable-frequency operation quantity, the fixed-frequency water pump frequency, the variable-frequency water pump frequency, and the opening of the flow regulating device further includes:

[0045] If the fixed-frequency water pump frequency is greater than the first preset frequency threshold, determining whether the variable-frequency water pump frequency is less than a second preset frequency threshold;

[0046] If the frequency of the variable frequency water pump is greater than or equal to the second preset frequency threshold, the water pump of the variable frequency unit is subjected to a frequency reduction operation;

[0047] Delaying the first preset period, re-performing the step of determining whether the first opening of the flow regulating device in the fixed-frequency unit is greater than the first preset opening threshold.

[0048] Optionally, adjusting the operating load rate of the operating unit according to the fixed-frequency operation quantity, the variable-frequency operation quantity, the fixed-frequency water pump frequency, the variable-frequency water pump frequency, and the opening of the flow regulating device further includes:

[0049] If the frequency of the variable frequency water pump is less than the second preset frequency threshold, the flag position 1 is not adjusted, and the operating load rate is not adjusted.

[0050] Optionally, adjusting the operating load rate of the operating unit according to the operating status data and the opening of the flow regulating device includes:

[0051] Determine the fixed-frequency operation quantity and the total fixed-frequency quantity of the fixed-frequency units in the air-conditioning system, and the total variable-frequency quantity of the variable-frequency units according to the operating status data;

[0052] The operating load rate of the operating unit is adjusted according to the fixed-frequency operation quantity, the total fixed-frequency operation quantity, the total variable-frequency operation quantity and the opening degree of the flow regulating device.

[0053] Optionally, adjusting the operating load rate of the operating unit according to the fixed-frequency operation quantity, the total fixed-frequency operation quantity, the total variable-frequency operation quantity, and the opening degree of the flow regulating device includes:

[0054] Determine whether the fixed-frequency operation quantity is equal to 1;

[0055] If the fixed-frequency operation number is equal to 1, determining whether the third opening of the flow regulating device of the fixed-frequency unit is greater than a first preset opening threshold;

[0056] If the third opening is greater than the first preset opening threshold, the flag position 1 is not adjusted, and the operating load rate is not adjusted.

[0057] Optionally, adjusting the operating load rate of the operating unit according to the fixed-frequency operation quantity, the total fixed-frequency operation quantity, the total variable-frequency operation quantity, and the opening degree of the flow regulating device includes:

[0058] If the third opening is less than or equal to the first preset opening threshold, determining whether the total number of frequency conversions is greater than 0;

[0059] If the total number of frequency conversion units is greater than 0, one or more frequency conversion units are turned on, and one or more fixed frequency units are turned off, and the end flag position is 1;

[0060] If the total number of frequency conversions is equal to 0, the non-adjustment flag position is set to 1, and the operating load rate is not adjusted.

[0061] Optionally, adjusting the operating load rate of the operating unit according to the fixed-frequency operation quantity, the total fixed-frequency operation quantity, the total variable-frequency operation quantity, and the opening degree of the flow regulating device includes:

[0062] If the fixed-frequency operation quantity is greater than 1, calculating whether the first total opening of the fixed-frequency units is less than the second total opening of the fixed-frequency units after reducing one or more units;

[0063] If the first total opening is smaller than the second total opening, one or more fixed-frequency units are shut down.

[0064] Optionally, adjusting the operating load rate of the operating unit according to the fixed-frequency operation quantity, the total fixed-frequency operation quantity, the total variable-frequency operation quantity, and the opening degree of the flow regulating device includes:

[0065] If the first total opening is greater than or equal to the second total opening, determining whether the third opening of the flow regulating device of the fixed-frequency unit is greater than a first preset opening threshold;

[0066] If the third opening is greater than the first preset opening threshold, the flag position 1 is not adjusted, and the operating load rate is not adjusted;

[0067] If the third opening is less than or equal to the first preset opening threshold, one or more variable frequency units are turned on, and one or more fixed frequency units are turned off, and the end mark position is 1.

[0068] In a second aspect, the present application provides an air conditioning control device, comprising:

[0069] The first acquisition module is used to obtain the operating status data of the fixed-frequency units and the variable-frequency units in the air-conditioning system;

[0070] A first determining module is configured to determine an operating unit in the air-conditioning system according to the operating status data, wherein the operating unit includes a fixed-frequency unit, or a combination of a fixed-frequency unit and the variable-frequency unit;

[0071] A second acquisition module is used to obtain the opening of the flow regulating device in the operating unit;

[0072] An adjustment module is used to adjust the operating load rate of the operating unit according to the operating status data and the opening of the flow regulating device.

[0073] In a third aspect, the present application provides an air conditioning system, comprising a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other via the communication bus;

[0074] Memory for storing computer programs;

[0075] The processor is configured to implement any of the air conditioning control methods described in the first aspect when executing a program stored in the memory.

[0076] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0077] The embodiment of the present application adjusts the operating load rate of the operating unit, i.e., the fixed-frequency unit, or adjusts the operating load rate of the operating unit, i.e., the fixed-frequency unit and the variable-frequency unit, according to the operating status data of the air-conditioning system and the opening degree of the flow regulating device in the operating unit, that is, controls the fixed-frequency unit and the variable-frequency unit separately, so that the operating load rate of the operating unit (the fixed-frequency unit, or the combination of the fixed-frequency unit and the variable-frequency unit) achieves higher energy efficiency, avoids the problem of low energy efficiency and high energy consumption caused by the constant load of the fixed-frequency unit and the variable-frequency unit being always close when the fixed-frequency unit and the variable-frequency unit are controlled at the same load rate, and can effectively give play to the advantages of the fixed-frequency unit and the variable-frequency unit to achieve the purpose of improving the overall operating energy efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0078] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0079] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0080] Figure 1 A flow chart of an air conditioning control method provided in an embodiment of the present application;

[0081] Figure 2 for Figure 1 A flow chart of step S104;

[0082] Figure 3 A flow chart of an air-conditioning control method when the air-conditioning system provided in an embodiment of the present application operates in a fixed-frequency variable-frequency combination mode;

[0083] Figure 4 A flow chart of another air-conditioning control method when the air-conditioning system provided in an embodiment of the present application operates in a fixed-variable frequency combination mode;

[0084] Figure 5 for Figure 1 Another flow chart of step S104;

[0085] Figure 6 A flow chart of an air conditioning control method when the air conditioning system provided in an embodiment of the present application operates in a fixed frequency mode;

[0086] Figure 7 This is the main control process of an air conditioning system;

[0087] Figure 8 A structural diagram of an air conditioning control device provided in an embodiment of the present application;

[0088] Figure 9 A structural diagram of an air conditioning system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0089] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0090] Since current fixed-variable frequency combination refrigeration systems generally use a one-to-one system control between the main unit and the chilled water pump, the chilled water pump generally uses full variable frequency or a fixed variable frequency system that follows the fixed variable frequency system of the unit. In terms of control, all variable frequency pumps use co-frequency control, while only the variable frequency pump in the fixed variable frequency combination uses variable frequency control. According to the performance curve trend of the refrigeration unit, the fixed frequency unit achieves the highest energy efficiency when the load factor is close to full load; the variable frequency unit generally achieves the highest energy efficiency when the load factor is between 50% and 80%. Due to factors such as the water pump control method and hydraulic balance, the fixed frequency unit and the variable frequency unit are generally controlled at the same load factor. As a result, during actual operation, the fixed frequency unit does not operate at close to full load, and the loads of the fixed variable frequency units are always similar, resulting in low system energy efficiency and high energy consumption, which cannot meet energy conservation requirements. To this end, the embodiments of the present application provide an air conditioning control method, device, and air conditioning system. This system can optimize the load factors of the fixed frequency unit and the variable frequency unit in a fixed variable frequency combination air conditioning system.

[0091] The embodiment of the present application provides an air conditioning control method, which can be applied to existing fixed-frequency variable frequency combined air conditioning systems and newly built fixed-frequency variable frequency combined air conditioning systems, and can be applied to screw-type, centrifugal chillers and heat pump units, including fixed-frequency variable frequency units of the same type, and also different types of fixed-frequency variable frequency units. This method can be used to optimize the energy efficiency of fixed-frequency and variable frequency units and improve the overall energy efficiency. Figure 1 As shown, the air conditioning control method includes:

[0092] Step S101, obtaining the operating status data of the fixed-frequency units and variable-frequency units in the air-conditioning system;

[0093] In the embodiment of the present application, the air-conditioning system includes: fixed-frequency units and variable-frequency units. When the air-conditioning system is in operation, it can operate in a full fixed-frequency mode, a full variable-frequency mode, or a fixed-variable-frequency combination mode. When the system operates in a full variable-frequency mode, the control method is consistent with the full variable-frequency system. Therefore, at this time, the system control process and optimization process are consistent with the full variable-frequency system, and the variable-frequency unit number optimization process is adopted. This method does not belong to the innovation of the present application and will not be repeated.

[0094] The operating status data includes: the number of fixed-frequency units actually operating in the air-conditioning system (i.e., the number of fixed-frequency units), the operating frequency of the water pumps in the fixed-frequency units (i.e., the fixed-frequency water pump frequency), the total number of fixed-frequency units (i.e., the total number of fixed-frequency units), the number of variable-frequency units actually operating (i.e., the number of variable-frequency units), the operating frequency of the water pumps in the variable-frequency units (i.e., the variable-frequency water pump frequency), the total number of variable-frequency units (i.e., the total number of variable-frequency units), the opening degree of the flow control device, including: the first opening degree, the second opening degree, the third opening degree, etc. If the compressor of the water-cooling unit is a centrifugal compressor, the flow control device is a guide vane; if the compressor of the water-cooling unit is a screw compressor, the flow control device is a slide valve.

[0095] Step S102, determining an operating unit in the air-conditioning system according to the operating status data, wherein the operating unit includes a fixed-frequency unit, or a combination of a fixed-frequency unit and the variable-frequency unit;

[0096] Since this application only focuses on the optimization of the operating load rate of the air-conditioning system in a full fixed frequency mode and a fixed-variable frequency combination mode, this application only targets the case where the operating unit is determined to be a fixed frequency unit based on the operating status data, or a combination of a fixed frequency unit and the variable frequency unit.

[0097] Step S103, obtaining the opening of the flow regulating device in the operating unit;

[0098] In this step, the opening degree of the flow regulating device in the operating unit can be obtained from the operating status data.

[0099] Step S104: adjusting the operating load rate of the operating unit according to the operating status data and the opening of the flow regulating device.

[0100] In this step, the corresponding adjustment strategy can be determined according to different operating status data (such as the number of fixed-frequency operations, the number of variable-frequency operations, the fixed-frequency water pump frequency, the variable-frequency water pump frequency, the total number of fixed frequencies and the total number of variable frequencies) and the opening of the flow regulating device in the operating unit, and the operating load rate of the operating unit can be adjusted according to the adjustment strategy.

[0101] The embodiment of the present application adjusts the operating load rate of the operating unit, i.e., the fixed-frequency unit, or adjusts the operating load rate of the operating unit, i.e., the fixed-frequency unit and the variable-frequency unit, according to the operating status data of the air-conditioning system and the opening of the flow regulating device in the operating unit, that is, controls the fixed-frequency unit and the variable-frequency unit separately, improves the operating load rate of the operating unit (the fixed-frequency unit, or the combination of the fixed-frequency unit and the variable-frequency unit), achieves higher energy efficiency, avoids the problem of low energy efficiency and high energy consumption caused by the constant load of the fixed-frequency unit and the variable-frequency unit being always close when the fixed-frequency unit and the variable-frequency unit are controlled at the same load rate, and can effectively give play to the advantages of the fixed-frequency unit and the variable-frequency unit to achieve the purpose of improving the overall operating energy efficiency.

[0102] In addition, when adopting the control method of this scheme, the water pump and the unit are the same unit, and each unit is independent of each other. The water pump can be independently adjusted according to the control parameters in each unit. Generally, hydraulic balance is only considered in parallel water circuits without transmission power and control devices. This scheme will independently adjust the frequency of the water pumps in the unit, so there is no corresponding problem caused by not considering "factors such as water pump control method and hydraulic balance".

[0103] In another embodiment of the present application, step S104 adjusts the operating load rate of the operating unit according to the operating status data and the opening of the flow regulating device, such as Figure 2 Shown, including:

[0104] Step S201, determining the number of fixed-frequency units in the air-conditioning system that are in fixed-frequency operation and the fixed-frequency water pump frequencies of the water pumps in the fixed-frequency units, as well as the number of variable-frequency units in variable-frequency operation and the variable-frequency water pump frequencies of the water pumps in the variable-frequency units, based on the operating status data;

[0105] Step S202 , adjusting the operating load rate of the operating unit according to the fixed-frequency operation quantity, the variable-frequency operation quantity, the fixed-frequency water pump frequency, the variable-frequency water pump frequency, and the opening of the flow regulating device.

[0106] In the embodiment of the present application, it is possible to determine whether a fixed-frequency unit or a fixed-variable-frequency unit is in operation based on the number of fixed-frequency operations and the number of variable-frequency operations. Furthermore, different adjustment strategies can be adopted for the fixed-frequency unit or the fixed-variable-frequency unit. When a variable-frequency unit is in operation, the operating load rate of the operating unit is adjusted based on the fixed-frequency water pump frequency, the variable-frequency water pump frequency, and the opening of the flow regulating device.

[0107] Furthermore, it is also possible to determine whether the fixed-frequency unit or the variable-frequency unit provides a larger proportion of load among the fixed-frequency and variable-frequency units based on the number of fixed-frequency operations and the number of variable-frequency operations. Then, different adjustment strategies are adopted for the fixed-frequency unit or the variable-frequency unit respectively providing a larger proportion of load. When the fixed-frequency unit provides a larger proportion of load, the operating load rate of the operating unit is adjusted according to the fixed-frequency water pump frequency, the variable-frequency water pump frequency and the opening of the flow control device according to different processes.

[0108] To sum up, the present application can improve the operating load rate of the operating unit by separately controlling the fixed-frequency unit and the variable-frequency unit, thereby achieving higher energy efficiency, and avoiding the problem of low energy efficiency and high energy consumption caused by the load of the fixed-frequency unit and the variable-frequency unit being always close when the fixed-frequency unit and the variable-frequency unit are controlled at the same load rate. It can effectively give play to the advantages of the fixed-frequency unit and the variable-frequency unit to achieve the purpose of improving the overall operating energy efficiency.

[0109] In another embodiment of the present application, step S202 adjusts the operating load rate of the operating unit according to the fixed frequency operation number, the variable frequency operation number, the fixed frequency water pump frequency, the variable frequency water pump frequency and the opening of the flow regulating device, such as Figure 3 Shown, including:

[0110] Determining whether the fixed-frequency operation quantity is greater than the variable-frequency operation quantity;

[0111] Figure 3 In the figure, N3 is the number of fixed frequency operation, and N4 is the number of variable frequency operation.

[0112] In a case where the fixed-frequency operation quantity is greater than the variable-frequency operation quantity, determining whether a first opening degree of a flow regulating device in the fixed-frequency unit is greater than a first preset opening degree threshold;

[0113] Exemplarily, the first preset opening threshold may be 85%. In actual applications, other values ​​may also be used, and this embodiment of the present application does not limit this.

[0114] If the first opening is greater than a first preset opening threshold, determining whether a second opening of the flow regulating device in the variable frequency unit is greater than the first preset opening threshold;

[0115] Exemplarily, the second preset opening threshold may be 85%. In actual applications, other values ​​may also be used, and this embodiment of the present application does not limit this.

[0116] If the second opening is greater than the first preset opening threshold, the end flag is set to position 1, and the operating load rate is not adjusted.

[0117] In the embodiment of the present application, when the end mark position is 1, it indicates that the current system energy efficiency is relatively high and no adjustment is required, so the operating load rate is not adjusted. At this time, it is necessary to wait for a certain period of time for the system parameters to change before performing another test to prevent invalid detection and judgment. Therefore, the step of determining whether the fixed-frequency operation number is greater than the variable-frequency operation number can be re-executed.

[0118] In this application, when the load proportion of the fixed-frequency unit is large and the load proportion of the variable-frequency unit is small, if the first opening of the flow regulating device of the fixed-frequency unit is high and the second opening of the flow regulating device of the variable-frequency unit is high, it indicates that the current system energy efficiency is high and no adjustment is required, thereby avoiding wasting system resources.

[0119] On the basis of the above embodiment, in another embodiment of the present application, step S202 adjusts the operating load rate of the operating unit according to the fixed frequency operation number, the variable frequency operation number, the fixed frequency water pump frequency, the variable frequency water pump frequency and the opening of the flow regulating device, such as Figure 3 As shown, it also includes:

[0120] If the second opening is less than or equal to the first preset opening threshold, performing a frequency increase operation on the water pump in the frequency conversion unit;

[0121] Delaying the first preset time period, re-performing the step of determining whether the first opening of the flow regulating device in the fixed-frequency unit is greater than the first preset opening threshold.

[0122] Exemplarily, the first preset time period may be 2 minutes. In actual applications, it may also be other values, which is not limited in the embodiments of the present application.

[0123] In the present application, when the load proportion of the fixed-frequency unit is large and the load proportion of the variable-frequency unit is small, if the second opening of the flow regulating device of the variable-frequency unit is low, the water pump frequency of the variable-frequency unit can be adjusted separately, thereby increasing the operating load rate of the operating unit to achieve higher energy efficiency, avoiding the problem of low energy efficiency and high energy consumption caused by the constant and variable-frequency unit loads being always close when the fixed-frequency unit and the variable-frequency unit are controlled at the same load rate, and effectively giving play to the advantages of the variable-frequency unit to achieve the purpose of improving the overall operating energy efficiency.

[0124] On the basis of the above embodiment, in another embodiment of the present application, step S202 adjusts the operating load rate of the operating unit according to the fixed frequency operation number, the variable frequency operation number, the fixed frequency water pump frequency, the variable frequency water pump frequency and the opening of the flow regulating device, such as Figure 3 As shown, it also includes:

[0125] If the first opening is less than or equal to the first preset opening threshold, determining whether the frequency of the fixed-frequency water pump is greater than a first preset frequency threshold;

[0126] Exemplarily, the first preset frequency threshold may be 45 Hz. In practical applications, it may also be other values, which is not limited in the embodiments of the present application.

[0127] If the fixed-frequency water pump frequency is greater than the first preset frequency threshold, determining whether the variable-frequency water pump frequency is less than a second preset frequency threshold;

[0128] Exemplarily, the second preset frequency threshold may be 25 Hz. In practical applications, it may also be other values, which is not limited in the embodiments of the present application.

[0129] If the frequency of the variable frequency water pump is less than the second preset frequency threshold, the flag position 1 is not adjusted, and the operating load rate is not adjusted.

[0130] In the embodiment of the present application, when the non-adjustment flag is at position 1, it indicates that the adjustment conditions are not met and no adjustment is required, so the operating load rate is not adjusted. At this time, it is necessary to wait for a certain period of time for the system parameters to change before performing another test to prevent invalid detection and judgment. Therefore, the step of determining whether the fixed-frequency operation number is greater than the variable-frequency operation number can be re-executed.

[0131] In this application, when the load proportion of the fixed-frequency unit is large and the load proportion of the variable-frequency unit is small, if the first opening of the flow regulating device of the fixed-frequency unit is high, the frequency of the fixed-frequency water pump is high and the frequency of the variable-frequency water pump is low, it indicates that the current system energy efficiency is high and no adjustment is required, avoiding wasting system resources.

[0132] On the basis of the above embodiment, in another embodiment of the present application, step S202 adjusts the operating load rate of the operating unit according to the fixed frequency operation number, the variable frequency operation number, the fixed frequency water pump frequency, the variable frequency water pump frequency and the opening of the flow regulating device, such as Figure 3 As shown, it also includes:

[0133] If the frequency of the variable frequency water pump is greater than or equal to the second preset frequency threshold, the water pump in the variable frequency unit is subjected to a frequency reduction operation, the first preset time period is delayed, and the step of determining whether the first opening of the flow regulating device in the fixed frequency unit is greater than the first preset opening threshold is re-executed.

[0134] In this application, when the load proportion of the fixed-frequency unit is large and the load proportion of the variable-frequency unit is small, if the first opening of the flow regulating device of the fixed-frequency unit is high, the frequency of the fixed-frequency water pump is high and the frequency of the variable-frequency water pump is high, the frequency of the variable-frequency water pump can be reduced to increase the operating load rate of the entire operating unit and achieve higher energy efficiency. This avoids the problem of low energy efficiency and high energy consumption caused by the constant and variable-frequency unit loads being always close when the fixed-frequency unit and the variable-frequency unit are controlled at the same load rate. This can effectively give play to the advantages of the variable-frequency unit to achieve the purpose of improving the overall operating energy efficiency.

[0135] Based on the above embodiment, in another embodiment of the present application, step S202 adjusts the operating load rate of the operating unit according to the fixed-frequency operation number, the variable-frequency operation number, the fixed-frequency water pump frequency, the variable-frequency water pump frequency, and the opening of the flow regulating device, and further includes:

[0136] If the frequency of the fixed-frequency water pump is less than or equal to a first preset frequency threshold, performing a frequency increase operation on the water pump of the fixed-frequency unit;

[0137] Delaying the first preset time period, re-performing the step of determining whether the first opening of the flow regulating device in the fixed-frequency unit is greater than the first preset opening threshold.

[0138] In this application, when the load proportion of the fixed-frequency unit is large and the load proportion of the variable-frequency unit is small, if the first opening of the flow regulating device of the fixed-frequency unit is high and the frequency of the fixed-frequency water pump is low, the frequency of the fixed-frequency water pump can be increased to increase the operating load rate of the entire operating unit and achieve higher energy efficiency. This avoids the problem of low energy efficiency and high energy consumption caused by the constant load of the fixed-frequency unit and the variable-frequency unit being always close when the fixed-frequency unit and the variable-frequency unit are controlled at the same load rate. This can effectively give play to the advantages of the variable-frequency unit to achieve the purpose of improving the overall operating energy efficiency.

[0139] On the basis of the above embodiment, in another embodiment of the present application, step S202 adjusts the operating load rate of the operating unit according to the fixed frequency operation number, the variable frequency operation number, the fixed frequency water pump frequency, the variable frequency water pump frequency and the opening of the flow regulating device, such as Figure 4 As shown, it also includes:

[0140] When the fixed-frequency operation quantity is less than or equal to the variable-frequency operation quantity, determining whether the second opening degree of the flow regulating device in the variable-frequency unit is greater than the first preset opening degree threshold;

[0141] If the second opening is greater than the first preset opening threshold, determining whether the first opening of the flow regulating device in the fixed-frequency unit is greater than the first preset opening threshold;

[0142] If the first opening is greater than the first preset opening threshold, the end flag is set to position 1, and the operating load rate is not adjusted.

[0143] In this application, when the load proportion of the fixed-frequency unit is small and the load proportion of the variable-frequency unit is large, if the second opening of the flow regulating device of the variable-frequency unit is high and the first opening of the flow regulating device of the fixed-frequency unit is high, it indicates that the current system energy efficiency is high and no adjustment is required, avoiding wasting system resources.

[0144] On the basis of the above embodiment, in another embodiment of the present application, step S202 adjusts the operating load rate of the operating unit according to the fixed frequency operation number, the variable frequency operation number, the fixed frequency water pump frequency, the variable frequency water pump frequency and the opening of the flow regulating device, such as Figure 4 As shown, it also includes:

[0145] If the first opening is less than or equal to the first preset opening threshold, determining whether the second opening is less than a third preset opening threshold;

[0146] Exemplarily, the third preset opening threshold may be 90%. In actual applications, it may also be other values, which is not limited in the embodiments of the present application.

[0147] If the second opening is less than the third preset opening threshold, the flag position 1 is not adjusted, and the operating load rate is not adjusted.

[0148] In this application, when the load proportion of the fixed-frequency unit is small and the load proportion of the variable-frequency unit is large, if the second opening of the flow regulating device of the variable-frequency unit is high, the first opening of the flow regulating device of the fixed-frequency unit is low, and the second opening of the flow regulating device of the variable-frequency unit does not exceed the upper limit, it indicates that the current system energy efficiency is high and no adjustment is required to avoid wasting system resources.

[0149] On the basis of the above embodiment, in another embodiment of the present application, step S202 adjusts the operating load rate of the operating unit according to the fixed frequency operation number, the variable frequency operation number, the fixed frequency water pump frequency, the variable frequency water pump frequency and the opening of the flow regulating device, such as Figure 4 As shown, it also includes:

[0150] If the second opening is greater than or equal to the third preset opening threshold, performing a frequency increase operation on the water pump in the fixed-frequency unit;

[0151] Delaying the first preset time period, re-performing the step of determining whether the fixed-frequency operation quantity is greater than the variable-frequency operation quantity.

[0152] In the present application, when the load proportion of the fixed-frequency unit is small and the load proportion of the variable-frequency unit is large, if the second opening of the flow regulating device of the variable-frequency unit is high, the first opening of the flow regulating device of the fixed-frequency unit is low and the second opening of the flow regulating device of the variable-frequency unit exceeds the upper limit, the frequency of the fixed-frequency water pump can be increased to increase the operating load rate of the entire operating unit to achieve higher energy efficiency, avoid the problem of low energy efficiency and high energy consumption caused by the constant and variable-frequency unit loads being always close when the fixed-frequency unit and the variable-frequency unit are controlled at the same load rate, and effectively give play to the advantages of the variable-frequency unit to achieve the purpose of improving the overall operating energy efficiency.

[0153] On the basis of the above embodiment, in another embodiment of the present application, step S202 adjusts the operating load rate of the operating unit according to the fixed frequency operation number, the variable frequency operation number, the fixed frequency water pump frequency, the variable frequency water pump frequency and the opening of the flow regulating device, such as Figure 4 As shown, it also includes:

[0154] If the second opening is less than or equal to the first preset opening threshold, determining whether the frequency of the fixed-frequency water pump is greater than a first preset frequency threshold;

[0155] If the frequency of the fixed-frequency water pump is less than or equal to the first preset frequency threshold, performing an upgrade operation on the water pump of the fixed-frequency unit;

[0156] Delaying a first preset period, re-performing the step of determining whether the fixed-frequency operation quantity is greater than the variable-frequency operation quantity.

[0157] In the present application, when the load proportion of the fixed-frequency unit is small and the load proportion of the variable-frequency unit is large, if the second opening of the flow regulating device of the variable-frequency unit is low and the frequency of the fixed-frequency water pump is low, the frequency of the fixed-frequency water pump can be increased to increase the operating load rate of the entire operating unit and achieve higher energy efficiency. This avoids the problem of low energy efficiency and high energy consumption caused by the constant and variable-frequency unit loads being always close when the fixed-frequency unit and the variable-frequency unit are controlled at the same load rate. This can effectively give play to the advantages of the variable-frequency unit to achieve the purpose of improving the overall operating energy efficiency.

[0158] On the basis of the above embodiment, in another embodiment of the present application, step S202 adjusts the operating load rate of the operating unit according to the fixed frequency operation number, the variable frequency operation number, the fixed frequency water pump frequency, the variable frequency water pump frequency and the opening of the flow regulating device, such as Figure 4 As shown, it also includes:

[0159] If the fixed-frequency water pump frequency is greater than the first preset frequency threshold, determining whether the variable-frequency water pump frequency is less than a second preset frequency threshold;

[0160] If the frequency of the variable frequency water pump is greater than or equal to the second preset frequency threshold, the water pump of the variable frequency unit is subjected to a frequency reduction operation;

[0161] Delaying the first preset period, re-performing the step of determining whether the first opening of the flow regulating device in the fixed-frequency unit is greater than the first preset opening threshold.

[0162] In this application, when the load proportion of the fixed-frequency unit is small and the load proportion of the variable-frequency unit is large, if the second opening of the flow regulating device of the variable-frequency unit is low, the frequency of the fixed-frequency water pump is high and the frequency of the variable-frequency water pump is high, the frequency of the variable-frequency water pump can be reduced to increase the operating load rate of the entire operating unit and achieve higher energy efficiency. This avoids the problem of low energy efficiency and high energy consumption caused by the constant and variable-frequency unit loads being always close when the fixed-frequency unit and the variable-frequency unit are controlled at the same load rate. This can effectively give play to the advantages of the variable-frequency unit to achieve the purpose of improving the overall operating energy efficiency.

[0163] On the basis of the above embodiment, in another embodiment of the present application, step S202 adjusts the operating load rate of the operating unit according to the fixed frequency operation number, the variable frequency operation number, the fixed frequency water pump frequency, the variable frequency water pump frequency and the opening of the flow regulating device, such as Figure 4 As shown, it also includes:

[0164] If the frequency of the variable frequency water pump is less than the second preset frequency threshold, the flag position 1 is not adjusted, and the operating load rate is not adjusted.

[0165] In this application, when the load proportion of the fixed-frequency unit is small and the load proportion of the variable-frequency unit is large, if the second opening of the flow regulating device of the variable-frequency unit is low, the frequency of the fixed-frequency water pump is high and the frequency of the variable-frequency water pump is low, it indicates that the current system energy efficiency is high and no adjustment is required to avoid wasting system resources.

[0166] In summary, when the operating unit of this application is a fixed-frequency variable-frequency combination unit, the control logic is:

[0167] 1. First, compare the number of operating fixed-frequency units and variable-frequency units. A system with a large number of operating units indicates a large load. The system energy efficiency is adjusted first with the improvement of the load ratio as the main adjustment target. Then, the energy efficiency of the system with a small load ratio is adjusted secondary without affecting the main adjustment.

[0168] 2. The unit adjustment uses the guide vane opening as the control target. When the guide vane opening of the unit is >85%, it is considered that the unit energy efficiency is in a better operating range.

[0169] 3. The unit load is indirectly controlled by adjusting the water flow of each system. When the water pump flow increases, the flow through the corresponding unit increases. The unit needs to cool more refrigerant to the target temperature, and the unit will automatically increase its own load; otherwise, the load will be reduced.

[0170] 4. When adjusting the target, give priority to adjusting the frequency conversion pump frequency of the main adjustment target. When the frequency of the main adjustment target pump is adjusted to the upper and lower frequency range of the pump, reversely adjust the frequency of the secondary control target pump (the purpose is to give priority to controlling the frequency conversion pump of the main target. It belongs to the direct control of the relevant parameters of the main equipment, with a faster change speed and stable control.

[0171] In another embodiment of the present application, step S104 adjusts the operating load rate of the operating unit according to the operating status data and the opening of the flow regulating device, such as Figure 5 Shown, including:

[0172] Step S301, determining the fixed-frequency operation quantity and the total fixed-frequency quantity of the fixed-frequency units in the air-conditioning system, and the total variable-frequency quantity of the variable-frequency units, according to the operating status data;

[0173] Step S302, adjusting the operating load rate of the operating unit according to the fixed-frequency operation quantity, the total fixed-frequency operation quantity, the total variable-frequency operation quantity and the opening of the flow regulating device.

[0174] In the embodiment of the present application, it can be determined whether the unit currently in operation is a fixed-frequency unit or a fixed-variable-frequency unit based on the number of fixed-frequency operations and the number of variable-frequency operations. Furthermore, different adjustment strategies can be adopted for the fixed-frequency unit or the fixed-variable-frequency unit. When the unit currently in operation is a fixed-frequency unit, the operating load rate of the operating unit is adjusted based on the number of fixed-frequency operations, the total number of fixed frequencies, the total number of variable frequencies, and the opening of the flow control device.

[0175] Furthermore, it is also possible to determine whether to start one or more fixed-frequency units, shut down one or more fixed-frequency units, or not adjust them based on the fixed-frequency operation quantity, the total fixed-frequency quantity, the total variable-frequency quantity, and the opening of the flow regulating device.

[0176] To sum up, the present application can achieve higher energy efficiency by independently controlling the fixed-frequency unit, improving the operating load rate of the operating unit, and avoiding the problem of low energy efficiency and high energy consumption caused by the constant load of the fixed-frequency unit and the variable-frequency unit being always close when the fixed-frequency unit and the variable-frequency unit are controlled at the same load rate. It can effectively give play to the advantages of the fixed-frequency unit and the variable-frequency unit to achieve the purpose of improving the overall operating energy efficiency.

[0177] In another embodiment of the present application, step S302 adjusts the operating load rate of the operating unit according to the fixed frequency operation quantity, the total fixed frequency quantity, the total variable frequency quantity and the opening of the flow regulating device, such as Figure 6 Shown, including:

[0178] Determine whether the fixed-frequency operation quantity is equal to 1;

[0179] If the fixed-frequency operation number is equal to 1, determining whether the third opening of the flow regulating device of the fixed-frequency unit is greater than a first preset opening threshold;

[0180] If the third opening is greater than the first preset opening threshold, the flag position 1 is not adjusted, and the operating load rate is not adjusted.

[0181] In this application, when the fixed-frequency operation number is 1, if the third opening of the flow regulating device of the fixed-frequency unit is large, it indicates that the current system energy efficiency is high and no adjustment is required, thereby avoiding wasting system resources.

[0182] On the basis of the above embodiment, in another embodiment of the present application, step S302 adjusts the operating load rate of the operating unit according to the fixed frequency operation quantity, the total fixed frequency quantity, the total variable frequency quantity and the opening of the flow regulating device, such as Figure 6 Shown, including:

[0183] If the third opening is less than or equal to the first preset opening threshold, determining whether the total number of frequency conversions is greater than 0;

[0184] Figure 6 In the figure, N2 is the total number of variable frequency units, and N1 is the total number of fixed frequency units.

[0185] If the total number of frequency conversion units is greater than 0, one or more frequency conversion units are turned on, and one or more fixed frequency units are turned off, and the end flag position is 1;

[0186] If the total number of frequency conversions is equal to 0, the non-adjustment flag position is set to 1, and the operating load rate is not adjusted.

[0187] When the fixed-frequency unit is running, the application determines whether to add or subtract the machine by the guide vane opening or the slide valve opening, and whether it is greater than 85% is used as the control target for addition or subtraction.

[0188] In this application, when the number of fixed-frequency operations is 1, if the third opening of the flow regulating device of the fixed-frequency unit is small and the total number of variable-frequency units is greater than 0, that is, there are unturned variable-frequency units, then one or more variable-frequency units can be turned on to supplement the load.

[0189] On the basis of the above embodiment, in another embodiment of the present application, step S302 adjusts the operating load rate of the operating unit according to the fixed frequency operation quantity, the total fixed frequency quantity, the total variable frequency quantity and the opening of the flow regulating device, such as Figure 6 Shown, including:

[0190] If the fixed-frequency operation quantity is greater than 1, calculating whether the first total opening of the fixed-frequency units is less than the second total opening of the fixed-frequency units after reducing one or more units;

[0191] If the first total opening is smaller than the second total opening, one or more fixed-frequency units are shut down.

[0192] In this application, when the number of fixed-frequency operations is greater than 1, if the first total opening of the fixed-frequency units is less than the second total opening of the fixed-frequency units after one or more units are shut down, one or more fixed-frequency units can be shut down to increase the load of the remaining fixed-frequency units.

[0193] On the basis of the above embodiment, in another embodiment of the present application, step S302 adjusts the operating load rate of the operating unit according to the fixed frequency operation quantity, the total fixed frequency quantity, the total variable frequency quantity and the opening of the flow regulating device, such as Figure 6 Shown, including:

[0194] If the first total opening is greater than or equal to the second total opening, determining whether the third opening of the flow regulating device of the fixed-frequency unit is greater than a first preset opening threshold;

[0195] If the third opening is greater than the first preset opening threshold, the flag position 1 is not adjusted, and the operating load rate is not adjusted;

[0196] If the third opening is less than or equal to the first preset opening threshold, one or more variable frequency units are turned on, and one or more fixed frequency units are turned off, and the end mark position is 1.

[0197] In the present application, when the number of fixed-frequency operations is greater than 1, if the first total opening of the fixed-frequency units is greater than the second total opening of the fixed-frequency units after one or more units are shut down and the third opening is larger, no adjustment is required; if the first total opening of the fixed-frequency units is greater than the second total opening of the fixed-frequency units after one or more units are shut down and the third opening is smaller, one or more variable-frequency units can be turned on and the load can be adjusted using the performance of the variable-frequency units.

[0198] For example, the control flow of the full fixed frequency operation mode is as follows:

[0199] 1. Determine whether the system is running only one fixed-frequency unit. If so, check whether the unit's guide vane opening is >85% (the load adjustment method for fixed-frequency units is guide vane opening adjustment; the larger the guide vane opening, the higher the unit load rate). This process detects whether the currently running unit is close to full load. When the fixed-frequency unit is running close to full load, the unit's operating energy efficiency is at a high level;

[0200] 2. If there are more than one operating unit, calculate whether the guide vane opening of the operating unit multiplied by the number of operating units is less than the total guide vane opening after removing one unit (i.e., (N3-1)*100%). (In this case, the guide vane opening of the unit is roughly interpreted as the unit load factor. If the result is true, it is considered that the number of units in operation is too large and one unit can be removed. If the result is false, determine whether the guide vane opening of the unit is greater than 85%. If so, the result is consistent with step 1. If not, it is considered that the current unit operation mode is not the optimal solution and the fixed-frequency unit is not operating optimally.

[0201] 3. In steps 1 and 2, if the result is yes or no, then if a variable frequency unit is available, a variable frequency unit will be turned on. The system adopts a fixed frequency and variable frequency combined operation mode. The control module controls the system to turn on a variable frequency unit and then turn off a fixed frequency unit.

[0202] In summary, when the operating unit of this application is a fixed-frequency variable-frequency combination unit, the control logic is:

[0203] Determine if the fixed-frequency units are not operating in the high-efficiency zone near full load. If not, shut down one of the corresponding fixed-frequency units and allow the other units to reach full load, keeping the system operating in the high-efficiency zone. If full load cannot be achieved by reducing the number of units, shut down one fixed-frequency unit and start a variable-frequency unit, entering a fixed-variable-frequency combined operation mode and utilizing the variable-frequency unit's performance to adjust the load.

[0204] For ease of understanding, the present application also provides an embodiment of the main logic of the air conditioning control method in practical applications, as follows:

[0205] 1. As Figure 7 As shown, the main logic judgment process:

[0206] 1. Check whether the system's active defense switch is on. Only when the active defense switch is on can the system perform fault diagnosis, location, and defense. All relevant parameters required for diagnosis must be complete.

[0207] 2. Read parameters include N1 and N2, which are the number of units available, i.e., the system can automatically start and the equipment is not running; N3 and N4, which are the actual number of units in operation of the project, read through group control; chilled water pump operating frequency F; chilled water pump frequency upper and lower limits Fmax, Fmin; operating unit current percentage I; guide vane opening / slide valve opening Gvo (centrifugal guide vane, screw type slide valve); total system cooling capacity Q; total system power consumption P; system chilled water pump control target set value T. Fixed frequency N1 and variable frequency N2 are the number of units available, i.e., the system can automatically start and the equipment is not running; fixed frequency N3 and variable frequency N4 are the actual number of units in operation of the project.

[0208] 3. Calculate the current energy efficiency of the system: cop = Q / P;

[0209] 4. Determine the system unit operation mode: When only the variable frequency unit is running, that is, N3=0, N4>0, the system is in full variable frequency operation mode; when only the fixed frequency unit is running, that is, N3>0, N4=0, the system is in full fixed frequency operation mode; when N3 and N4 are both >0, the system is in a combination of fixed and variable frequency operation mode. (The operating system has only three operation modes, and the system shutdown state is not considered as a non-operating state)

[0210] 5. When the system is operating in full frequency conversion mode, the control method is consistent with that of a full frequency conversion system. Therefore, the system control process and optimization process are consistent with those of a full frequency conversion system, using the process optimized by the number of frequency conversion units. This method is not an innovation of this patent and will not be described in detail.

[0211] 6. The control process repeatedly diagnoses the corresponding flags output by each sub-process, including the end flag, no adjustment flag, and restart flag. The end and no adjustment flags require a delay before repeating the defense process. This is because the end and no adjustment flags indicate that the system does not require adjustment or that the adjustment conditions are not met. In this case, a delay is required before retesting the system parameters to prevent invalid detection and judgment. The restart process occurs after a short delay after parameter adjustment. In this case, the system needs to retest to ensure that the adjustment is in place. This delay is unnecessary to prevent ineffective or excessive intervention.

[0212] In another embodiment of the present application, an air conditioning control device is also provided, such as Figure 8 Shown, including:

[0213] The first acquisition module 11 is used to obtain the operating status data of the fixed-frequency units and variable-frequency units in the air-conditioning system;

[0214] A first determining module 12 is configured to determine an operating unit in the air-conditioning system according to the operating status data, wherein the operating unit includes a fixed-frequency unit, or a combination of a fixed-frequency unit and the variable-frequency unit;

[0215] The second acquisition module 13 is used to obtain the opening degree of the flow regulating device in the operating unit;

[0216] The adjustment module 14 is configured to adjust the operating load rate of the operating unit according to the operating status data and the opening of the flow regulating device.

[0217] In another embodiment of the present application, an air conditioning system is provided, comprising a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other via the communication bus;

[0218] Memory for storing computer programs;

[0219] The processor is configured to implement the air conditioning control method described in any of the aforementioned method embodiments when executing the program stored in the memory.

[0220] In the air-conditioning system provided by the embodiment of the present invention, the processor executes a program stored in the memory to adjust the operating load rate of the operating unit, i.e., the fixed-frequency unit, or adjust the operating load rates of the operating units, i.e., the fixed-frequency unit and the variable-frequency unit, according to the operating status data of the air-conditioning system and the opening of the flow regulating device in the operating unit. That is, the fixed-frequency unit and the variable-frequency unit are controlled separately so that the operating load rate of the operating unit (the fixed-frequency unit, or the combination of the fixed-frequency unit and the variable-frequency unit) achieves higher energy efficiency, avoiding the problem of low energy efficiency and high energy consumption caused by the constant-frequency and variable-frequency unit loads being always close when the fixed-frequency unit and the variable-frequency unit are controlled at the same load rate. The advantages of the fixed-frequency unit and the variable-frequency unit can be effectively brought into play to achieve the purpose of improving the overall operating energy efficiency.

[0221] The communication bus 1140 mentioned in the above air conditioning system can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The communication bus 1140 can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 9 Only one thick line is used in the diagram, but this does not mean that there is only one bus or one type of bus.

[0222] The communication interface 1120 is used for communication between the air conditioning system and other devices.

[0223] The memory 1130 may include a random access memory (RAM) or a non-volatile memory, such as at least one disk storage. Alternatively, the memory may be at least one storage device located away from the processor.

[0224] The above-mentioned processor 1110 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components.

[0225] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0226] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but is intended to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. An air conditioning control method, characterized in that: include: Obtain the operating status data of fixed-frequency units and variable-frequency units in the air-conditioning system; Determining an operating unit in the air-conditioning system according to the operating status data, wherein the operating unit includes a fixed-frequency unit, or a combination of a fixed-frequency unit and the variable-frequency unit; Obtaining the opening degree of a flow regulating device in the operating unit, wherein the flow regulating device is used to regulate the flow of the refrigerant circulating in the compressor; adjusting the operating load rate of the operating unit according to the operating status data and the opening of the flow regulating device; When the air conditioning system is operated in combination with a fixed frequency unit and a variable frequency unit, the operating load rate of the operating unit is adjusted according to the operating state data and the opening degree of the flow regulating device, including: Determine the fixed frequency running number of the fixed frequency units in the air conditioning system, the fixed frequency water pump frequency of the water pump in the fixed frequency units, the variable frequency running number of the variable frequency units, and the variable frequency water pump frequency of the water pump in the variable frequency units according to the running status data; Adjust the operating load rate of the operating unit according to the fixed frequency operation quantity, the variable frequency operation quantity, the fixed frequency water pump frequency, the variable frequency water pump frequency and the opening of the flow regulating device; The operation load rate of the operating unit is adjusted according to the fixed frequency operation quantity, the variable frequency operation quantity, the fixed frequency water pump frequency, the variable frequency water pump frequency and the opening of the flow regulating device, including: Determine whether the fixed frequency operation quantity is greater than the variable frequency operation quantity; In the case where the fixed-frequency operation quantity is greater than the variable-frequency operation quantity, determining whether a first opening degree of a flow regulating device in the fixed-frequency unit is greater than a first preset opening degree threshold; If the first opening is greater than a first preset opening threshold, determining whether a second opening of the flow regulating device in the variable frequency unit is greater than the first preset opening threshold; If the second opening is greater than the first preset opening threshold, the end mark position is 1, and the operating load rate is not adjusted.

2. The air conditioning control method according to claim 1, characterized in that: The operation load rate of the operating unit is adjusted according to the fixed frequency operation quantity, the variable frequency operation quantity, the fixed frequency water pump frequency, the variable frequency water pump frequency and the opening of the flow regulating device, and further includes: If the second opening is less than or equal to the first preset opening threshold, performing a frequency increase operation on the water pump in the frequency conversion unit; The first preset time period is delayed, and the step of determining whether the first opening of the flow regulating device in the fixed-frequency unit is greater than the first preset opening threshold is re-executed.

3. The air conditioning control method according to claim 1, characterized in that: The operation load rate of the operating unit is adjusted according to the fixed frequency operation quantity, the variable frequency operation quantity, the fixed frequency water pump frequency, the variable frequency water pump frequency and the opening of the flow regulating device, and further includes: If the first opening is less than or equal to the first preset opening threshold, determining whether the fixed-frequency water pump frequency is greater than a first preset frequency threshold; If the fixed-frequency water pump frequency is greater than the first preset frequency threshold, determining whether the variable-frequency water pump frequency is less than a second preset frequency threshold; If the frequency of the variable frequency water pump is less than the second preset frequency threshold, the flag position 1 is not adjusted, and the operating load rate is not adjusted.

4. The air conditioning control method according to claim 3, characterized in that: The operation load rate of the operating unit is adjusted according to the fixed frequency operation quantity, the variable frequency operation quantity, the fixed frequency water pump frequency, the variable frequency water pump frequency and the opening of the flow regulating device, and further includes: If the frequency of the variable frequency water pump is greater than or equal to the second preset frequency threshold, the water pump in the variable frequency unit is frequency-reduced, the first preset time period is delayed, and the step of determining whether the first opening of the flow regulating device in the fixed frequency unit is greater than the first preset opening threshold is re-executed.

5. The air conditioning control method according to claim 3, characterized in that: The operation load rate of the operating unit is adjusted according to the fixed frequency operation quantity, the variable frequency operation quantity, the fixed frequency water pump frequency, the variable frequency water pump frequency and the opening of the flow regulating device, and further includes: If the frequency of the fixed-frequency water pump is less than or equal to the first preset frequency threshold, performing a frequency increase operation on the water pump of the fixed-frequency unit; The first preset time period is delayed, and the step of determining whether the first opening of the flow regulating device in the fixed-frequency unit is greater than the first preset opening threshold is re-executed.

6. The air conditioning control method according to claim 1, characterized in that: The operation load rate of the operating unit is adjusted according to the fixed frequency operation quantity, the variable frequency operation quantity, the fixed frequency water pump frequency, the variable frequency water pump frequency and the opening of the flow regulating device, and further includes: In the case where the fixed frequency operation quantity is less than or equal to the variable frequency operation quantity, determining whether the second opening degree of the flow regulating device in the variable frequency unit is greater than the first preset opening degree threshold; If the second opening is greater than the first preset opening threshold, determining whether the first opening of the flow regulating device in the fixed-frequency unit is greater than the first preset opening threshold; If the first opening is greater than the first preset opening threshold, the end mark position is 1, and the operating load rate is not adjusted.

7. The air conditioning control method according to claim 6, characterized in that: The operation load rate of the operating unit is adjusted according to the fixed frequency operation quantity, the variable frequency operation quantity, the fixed frequency water pump frequency, the variable frequency water pump frequency and the opening of the flow regulating device, and further includes: If the first opening is less than or equal to the first preset opening threshold, determining whether the second opening is less than a third preset opening threshold; If the second opening is less than the third preset opening threshold, the flag position 1 is not adjusted, and the operating load rate is not adjusted.

8. The air conditioning control method according to claim 7, characterized in that: The operation load rate of the operating unit is adjusted according to the fixed frequency operation quantity, the variable frequency operation quantity, the fixed frequency water pump frequency, the variable frequency water pump frequency and the opening of the flow regulating device, and further includes: If the second opening is greater than or equal to the third preset opening threshold, performing a frequency increase operation on the water pump in the fixed-frequency unit; The first preset time period is delayed, and the step of determining whether the fixed-frequency operation quantity is greater than the variable-frequency operation quantity is re-executed.

9. The air conditioning control method according to claim 7, characterized in that: The operation load rate of the operating unit is adjusted according to the fixed frequency operation quantity, the variable frequency operation quantity, the fixed frequency water pump frequency, the variable frequency water pump frequency and the opening of the flow regulating device, and further includes: If the second opening is less than or equal to the first preset opening threshold, determining whether the frequency of the fixed-frequency water pump is greater than the first preset frequency threshold; If the frequency of the fixed-frequency water pump is less than or equal to the first preset frequency threshold, performing an upgrade operation on the water pump of the fixed-frequency unit; Delaying a first preset period, re-execute the step of determining whether the fixed-frequency operation quantity is greater than the variable-frequency operation quantity.

10. The air conditioning control method according to claim 9, characterized in that: The operation load rate of the operating unit is adjusted according to the fixed frequency operation quantity, the variable frequency operation quantity, the fixed frequency water pump frequency, the variable frequency water pump frequency and the opening of the flow regulating device, and further includes: If the fixed-frequency water pump frequency is greater than the first preset frequency threshold, determining whether the variable-frequency water pump frequency is less than a second preset frequency threshold; If the frequency of the variable frequency water pump is greater than or equal to the second preset frequency threshold, the water pump of the variable frequency unit is subjected to a frequency reduction operation; Delaying the first preset period, re-execute the step of determining whether the first opening of the flow regulating device in the fixed-frequency unit is greater than the first preset opening threshold.

11. The air conditioning control method according to claim 10, characterized in that: The operation load rate of the operating unit is adjusted according to the fixed frequency operation quantity, the variable frequency operation quantity, the fixed frequency water pump frequency, the variable frequency water pump frequency and the opening of the flow regulating device, and further includes: If the frequency of the variable frequency water pump is less than the second preset frequency threshold, the flag position 1 is not adjusted, and the operating load rate is not adjusted.

12. The air conditioning control method according to claim 1, characterized in that: When the air conditioning system is operated as a fixed frequency unit, the operating load rate of the operating unit is adjusted according to the operating status data and the opening of the flow regulating device, including: Determine the fixed-frequency operation quantity and the total fixed-frequency quantity of the fixed-frequency units in the air-conditioning system according to the operation status data, and the total variable-frequency quantity of the variable-frequency units; Adjust the operating load rate of the operating unit according to the fixed frequency operation quantity, the total variable frequency quantity and the opening degree of the flow regulating device; The operation load rate of the operating unit is adjusted according to the fixed frequency operation quantity, the total variable frequency operation quantity and the opening of the flow regulating device, including: Determine whether the fixed frequency operation quantity is equal to 1; If the fixed-frequency operation quantity is equal to 1, determining whether the third opening of the flow regulating device of the fixed-frequency unit is greater than the first preset opening threshold; If the third opening is greater than the first preset opening threshold, the flag position 1 is not adjusted, and the operating load rate is not adjusted.

13. The air conditioning control method according to claim 12, characterized in that: The operation load rate of the operating unit is adjusted according to the fixed frequency operation quantity, the total variable frequency operation quantity and the opening of the flow regulating device, including: If the third opening is less than or equal to the first preset opening threshold, determining whether the total number of frequency conversions is greater than 0; If the total number of frequency conversions is greater than 0, one or more frequency conversion units are turned on, and one or more fixed frequency units are turned off, and the end mark position is 1; If the total number of frequency conversions is equal to 0, the flag position 1 is not adjusted, and the operating load rate is not adjusted.

14. The air conditioning control method according to claim 12, characterized in that: The operation load rate of the operating unit is adjusted according to the fixed frequency operation quantity, the total variable frequency operation quantity and the opening of the flow regulating device, including: If the fixed-frequency operation quantity is greater than 1, calculating whether the first total opening of the fixed-frequency unit is less than the second total opening of the fixed-frequency unit after reducing one or more units; If the first total opening is smaller than the second total opening, one or more fixed-frequency units are shut down.

15. The air conditioning control method according to claim 14, characterized in that: The operation load rate of the operating unit is adjusted according to the fixed frequency operation quantity, the total variable frequency operation quantity and the opening of the flow regulating device, including: If the first total opening is greater than or equal to the second total opening, determining whether the third opening of the flow regulating device of the fixed-frequency unit is greater than a first preset opening threshold; If the third opening is greater than the first preset opening threshold, the flag position 1 is not adjusted, and the operating load rate is not adjusted; If the third opening is less than or equal to the first preset opening threshold, one or more variable frequency units are turned on, and one or more fixed frequency units are turned off, and the end mark position is 1.

16. An air conditioning control device, characterized in that: include: The first acquisition module is used to acquire the operating status data of the fixed-frequency units and the variable-frequency units in the air-conditioning system; A first determination module, configured to determine an operating unit in the air-conditioning system according to the operating status data, wherein the operating unit includes a fixed-frequency unit, or a combination of a fixed-frequency unit and the variable-frequency unit; A second acquisition module, used to acquire the opening degree of a flow regulating device in the operating unit, wherein the flow regulating device is used to regulate the flow of the refrigerant circulating in the compressor; An adjustment module, used for adjusting the operation load rate of the operating unit according to the operation status data and the opening of the flow regulating device; When the air conditioning system is operated in combination with a fixed frequency unit and a variable frequency unit, the operating load rate of the operating unit is adjusted according to the operating state data and the opening degree of the flow regulating device, including: Determine the fixed frequency running number of the fixed frequency units in the air conditioning system, the fixed frequency water pump frequency of the water pump in the fixed frequency units, the variable frequency running number of the variable frequency units, and the variable frequency water pump frequency of the water pump in the variable frequency units according to the running status data; Adjust the operating load rate of the operating unit according to the fixed frequency operation quantity, the variable frequency operation quantity, the fixed frequency water pump frequency, the variable frequency water pump frequency and the opening of the flow regulating device; The operation load rate of the operating unit is adjusted according to the fixed frequency operation quantity, the variable frequency operation quantity, the fixed frequency water pump frequency, the variable frequency water pump frequency and the opening of the flow regulating device, including: Determine whether the fixed frequency operation quantity is greater than the variable frequency operation quantity; In the case where the fixed-frequency operation quantity is greater than the variable-frequency operation quantity, determining whether a first opening degree of a flow regulating device in the fixed-frequency unit is greater than a first preset opening degree threshold; If the first opening is greater than a first preset opening threshold, determining whether a second opening of the flow regulating device in the variable frequency unit is greater than the first preset opening threshold; If the second opening is greater than the first preset opening threshold, the end mark position is 1, and the operating load rate is not adjusted.

17. An air conditioning system, characterized in that: It includes a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other through the communication bus; Memory, used to store computer programs; The processor is used to implement the air conditioning control method described in any one of claims 1 to 7 when executing the program stored in the memory.

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