Compressor frequency control method, compressor, electronic device and storage medium

Abstract

The application provides a compressor frequency control method, a compressor, an electronic device and a storage medium. The compressor frequency control method comprises the following steps: determining a temperature difference between a current frequency corresponding water outlet temperature and a set temperature; in response to the temperature difference being within a preset range, determining a frequency compensation value according to a temperature difference change period and a frequency reduction amplitude; wherein the temperature difference change period and the frequency reduction amplitude are determined by heat load; determining a frequency control parameter based on the current frequency and the frequency compensation value, and controlling the compressor to operate by using the frequency control parameter. The compressor frequency control method can adjust the frequency of the compressor based on the heat load, reduce the frequency of the compressor in a small load condition, delay temperature rise, reduce the start-stop frequency of the heat pump unit, improve the stability of the equipment, and prolong the service life of the equipment.

Description

Technical Field

[0001] This invention relates to the field of compressor control technology, and in particular to a compressor frequency control method, a compressor, electronic equipment, and a storage medium. Background Technology

[0002] In existing technologies, compressor frequency control in variable frequency heat pump units includes stepless speed regulation, stepless adjustment, and step-by-step adjustment. Stepless speed regulation adjusts the compressor frequency based on the temperature difference between the set temperature and the outlet water temperature, as well as the amount of temperature difference change. Under high load conditions with many rooms being heated, the compressor generally needs to maintain a high frequency to drive the heat pump, thereby enabling the room temperature to reach the set temperature. However, under low load conditions with good room insulation or fewer rooms being heated, if the compressor still maintains a high frequency, the water temperature will rapidly rise to the set temperature, triggering a shutdown upon reaching the set temperature. When there is a certain hysteresis between the set temperature and the outlet water temperature, the heat pump unit will restart and then quickly reach the set temperature and shut down again. This results in the heat pump unit repeatedly starting and stopping within a short period of time, affecting the stability and lifespan of the equipment. Summary of the Invention

[0003] This invention mainly provides a compressor frequency control method, a compressor, an electronic device, and a storage medium. The compressor frequency control method of this invention can improve equipment stability and extend equipment service life.

[0004] To solve the above-mentioned technical problems, the first technical solution adopted by the present invention is: to provide a compressor frequency control method, comprising:

[0005] Determine the temperature difference between the current outlet water temperature and the set temperature;

[0006] In response to the temperature difference being within a preset range, the frequency compensation value is determined based on the frequency reduction amplitude of the temperature difference change cycle; wherein, the frequency reduction amplitude of the temperature difference change cycle is determined by the heat load;

[0007] Frequency control parameters are determined based on the current frequency and frequency compensation value, and the compressor operation is controlled using these parameters.

[0008] In one embodiment, the heat load is negatively correlated with the frequency reduction of the temperature difference change cycle; and / or

[0009] The frequency compensation value is positively correlated with the frequency reduction amplitude of the temperature difference change cycle.

[0010] In one embodiment, determining frequency control parameters based on the current frequency and frequency compensation value includes:

[0011] The frequency control parameters are obtained by calculating the difference between the current frequency and the frequency compensation value.

[0012] In one embodiment, determining the frequency compensation value based on the frequency reduction amplitude of the temperature difference change cycle includes:

[0013] The frequency compensation value is determined based on the frequency reduction amplitude of temperature difference, the frequency conversion amplitude of temperature difference change, and the frequency reduction amplitude of temperature difference change period.

[0014] Among them, the frequency reduction amplitude of temperature difference is determined based on the frequency reduction coefficient of temperature difference and the first temperature difference corresponding to the current cycle; the frequency reduction amplitude of temperature difference change is determined based on the frequency reduction coefficient of temperature difference change rate and the temperature difference slope corresponding to the current cycle, and the temperature difference slope corresponding to the current cycle is the difference between the first temperature difference corresponding to the current cycle and the second temperature difference corresponding to the previous cycle; the frequency reduction amplitude of temperature difference change cycle is determined based on the cycle compensation coefficient, frequency compensation time, and temperature change time.

[0015] In one embodiment, the frequency reduction of the temperature difference is positively correlated with the first temperature difference corresponding to the current cycle; and / or

[0016] The frequency conversion amplitude of the temperature difference change is positively correlated with the temperature difference slope corresponding to the current cycle; and / or

[0017] The frequency decrease of the temperature difference change cycle is negatively correlated with the time of temperature change.

[0018] In one embodiment, the frequency compensation value is calculated as follows:

[0019] ΔF=K1×ΔTn+ K2×ΔΔTn+ K3×Time / Tt;

[0020] Where K1 represents the temperature difference frequency reduction coefficient, ΔTn represents the first temperature difference corresponding to the nth cycle, K2 represents the temperature difference change rate frequency reduction coefficient, ΔΔTn represents the temperature difference slope corresponding to the nth cycle, K3 represents the cycle compensation coefficient, Time represents the frequency compensation time, and Tt represents the temperature change time.

[0021] In one embodiment, in response to a temperature difference greater than a preset value, the frequency control parameters are determined based on the ambient temperature and the inlet water temperature.

[0022] To solve the above-mentioned technical problems, the second technical solution adopted by the present invention is to provide a compressor, wherein the compressor is controlled by the bus voltage adjustment method of any of the above-mentioned compressors.

[0023] To solve the above-mentioned technical problems, the third technical solution adopted by the present invention is: to provide an electronic device, the electronic device including a memory and a processor coupled to each other, the processor being used to execute program instructions stored in the memory, and the processor being used to execute program data to implement the compressor frequency control method of any of the above-mentioned methods.

[0024] To solve the above-mentioned technical problems, the fourth technical solution adopted by the present invention is: to provide an electronic device, wherein a computer program is stored on a computer-readable storage medium, and the computer program, when executed by a processor, implements the compressor frequency control method of any of the above-mentioned methods.

[0025] The beneficial effects of this invention are as follows: Unlike existing technologies, the compressor frequency control method provided by this invention includes: determining the temperature difference between the outlet water temperature corresponding to the current frequency and the set temperature; determining a frequency compensation value based on the frequency reduction amplitude during the temperature difference change cycle in response to the temperature difference being within a preset range; wherein the frequency reduction amplitude during the temperature difference change cycle is determined by the heat load; determining frequency control parameters based on the current frequency and the frequency compensation value; and controlling the compressor operation using the frequency control parameters. This compressor frequency control method can adjust the compressor frequency based on the heat load, rapidly reducing the compressor frequency under low load conditions, delaying temperature rise, reducing the start-up and shutdown frequency of the heat pump unit, improving equipment stability, and extending equipment lifespan. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a flowchart illustrating an embodiment of the compressor frequency control method of this application;

[0028] Figure 2 This is a schematic diagram of one embodiment of a heat pump unit;

[0029] Figure 3 This is a schematic diagram of the structure of an embodiment of the electronic device of this application;

[0030] Figure 4 This is a schematic diagram of the structure of an embodiment of the computer storage medium of this application. Detailed Implementation

[0031] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0032] In the following description, specific details such as particular system architectures, interfaces, and technologies are presented for illustrative purposes rather than for limiting purposes, in order to provide a thorough understanding of this application.

[0033] In this article, the term "and / or" simply describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Additionally, the character " / " generally indicates that the preceding and following related objects have an "or" relationship. Furthermore, "more" in this article means two or more objects.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0035] Before providing a further detailed description of the embodiments of this application, the nouns and terms involved in the embodiments of this application will be explained, and the nouns and terms involved in the embodiments of this application shall be interpreted as follows.

[0036] Understandably, user-side heat load demands exhibit significant individual differences and dynamic changes. For example, different room sizes, building envelope factors such as window sealing, and wall insulation thickness directly impact basic heat demand; the usage scenarios of the same user also change over time due to variations in occupant activity. Combined with... Figure 2 When multiple rooms share the same heat pump unit for heating, if only a few family members are home when they are away, the heating needs of one or two frequently used rooms, such as the master bedroom and study, are usually met. In this case, the heat load on the heat pump unit may only reach 25% or 50% of its full capacity. When family members return home, multiple rooms, such as the living room, dining room, and bedrooms, often need to be heated simultaneously, at which point the heat load on the heat pump unit increases to near full capacity. This significant change in heat load demand caused by changes in the number of people and activity scenarios places higher demands on the unit's control. However, existing heat pump unit compressor frequency control schemes mostly adopt standardized designs and do not adaptively optimize for such dynamic load characteristics. Under high load conditions with many rooms to be heated, the compressor generally needs to maintain a high frequency to drive the heat pump, so that the room temperature reaches the set temperature. However, under low load conditions with good room insulation or fewer rooms to be heated, if the compressor still maintains a high frequency, the water temperature will rise rapidly to the set temperature, triggering a temperature-reaching shutdown. When there is a certain temperature difference between the set temperature and the outlet water temperature, the heat pump unit will restart and then quickly reach the temperature and shut down, causing the heat pump unit to start and stop repeatedly in a short period of time, affecting the stability and lifespan of the equipment.

[0037] For example, a 5HP heat pump is set at the factory based on the heating demand of 5HP. A house with a heating demand of approximately 5HP would purchase a 5HP heat pump, which works well when heating all or most rooms. However, when the heating demand is low, such as when only a few rooms need heating, the demand drops from 90% to 20% or 40%, meaning the supply of heat far exceeds the demand. If the compressor frequency isn't quickly reduced to decrease the heat supply, the water temperature will rise rapidly, eventually triggering a temperature-triggered shutdown.

[0038] In view of this, this application provides a compressor frequency control method, comprising: determining the temperature difference between the outlet water temperature corresponding to the current frequency and the set temperature; in response to the temperature difference being within a preset range, determining a frequency compensation value based on the frequency reduction amplitude of the temperature difference change cycle; wherein the frequency reduction amplitude of the temperature difference change cycle is determined by the heat load; determining frequency control parameters based on the current frequency and the frequency compensation value, and controlling the compressor operation using the frequency control parameters.

[0039] It should be noted that under heavy load conditions, such as... Figure 2 When all four rooms require heating, the compressor needs to be driven at a higher frequency. Under low-load conditions, such as... Figure 2 When heating two rooms, if the compressor is continuously driven at a high frequency, the outlet water temperature will quickly reach the set temperature, triggering a temperature-reaching shutdown. When the temperature difference between the outlet water temperature and the set temperature is large, the equipment will restart. Due to the low heat load and the high compressor frequency, the outlet water temperature will again quickly reach the set temperature, causing frequent start-stop cycles, which affects the equipment's stability and lifespan. The compressor frequency control method proposed in this application can adjust the compressor frequency based on the heat load. Under low load conditions, the compressor frequency is reduced, the temperature rise is slowed down, the start-stop frequency of the heat pump unit is reduced, the equipment stability is improved, and the equipment lifespan is extended.

[0040] The method for adjusting the bus voltage of the compressor in this application will be explained in detail below with reference to the accompanying drawings.

[0041] See Figure 1 , Figure 1 This is a flowchart illustrating the first embodiment of the compressor frequency control method of this application, specifically including:

[0042] Step S11: Determine the temperature difference between the outlet water temperature corresponding to the current frequency and the set temperature.

[0043] In one embodiment, the outlet water temperature is periodically sampled, and the temperature difference between the outlet water temperature and the set temperature is calculated. The sampling period can be, for example, 1-10 seconds, such as 2 seconds, 5 seconds, etc., and is not specifically limited. In one embodiment, within one sampling period, the outlet water temperature is sampled 5 times, the average of these 5 outlet water temperatures is calculated, and the calculated average value is used as the outlet water temperature corresponding to the current sampling period.

[0044] It is understandable that a temperature sensor is installed at the outlet of the device to collect the water temperature; the set temperature is the temperature set by the user.

[0045] Step S12: In response to the temperature difference being within a preset range, determine the frequency compensation value based on the frequency reduction amplitude of the temperature difference change cycle; wherein, the frequency reduction amplitude of the temperature difference change cycle is determined by the heat load.

[0046] It should be noted that under low-load conditions, such as when the room has good insulation or when the user turns on heating in only a few rooms, the corresponding heat load is relatively small, and the outlet water temperature will quickly reach the set temperature. However, under high-load conditions, such as when the room has insufficient insulation or when heating is needed in many rooms, the corresponding heat load is relatively large, and the outlet water temperature will slowly reach the set temperature.

[0047] When the temperature difference is within a preset range, this application determines the frequency compensation value based on the frequency reduction amplitude of the temperature difference change cycle, and the frequency reduction amplitude of the temperature difference change cycle is determined by the heat load.

[0048] It should be noted that heat load is a parameter representing the amount of heat required to maintain a room temperature at a set temperature. If more rooms require heating, more heat is needed, resulting in a high heat load; conversely, if fewer rooms require heating, less heat is needed, resulting in a low heat load.

[0049] Generally speaking, external factors such as ambient temperature, wind speed, room insulation performance, and heat dissipation from people and machinery will affect room heating, while heat load refers to the amount of heat required to maintain the set room temperature excluding external factors.

[0050] In one embodiment, the heat load is negatively correlated with the frequency reduction of the temperature difference change cycle. Specifically, the larger the heat load, the smaller the frequency reduction of the temperature difference change cycle, and vice versa.

[0051] In one embodiment, the frequency compensation value is positively correlated with the frequency reduction amplitude of the temperature difference change cycle. Specifically, the smaller the frequency reduction amplitude of the temperature difference change cycle, the smaller the frequency compensation value, while the larger the frequency reduction amplitude of the temperature difference change cycle, the larger the frequency compensation value.

[0052] In one embodiment, the frequency compensation value is determined based on the frequency reduction amplitude of the temperature difference, the frequency conversion amplitude of the temperature difference change, and the frequency reduction amplitude of the temperature difference change period.

[0053] The frequency reduction amplitude due to temperature difference is determined based on the frequency reduction coefficient due to temperature difference and the first temperature difference corresponding to the current cycle. The first temperature difference is the temperature difference between the outlet water temperature and the set temperature corresponding to the current cycle. The frequency reduction coefficient due to temperature difference represents the frequency reduction amplitude of the compressor in the next cycle corresponding to each degree Celsius temperature difference. For example, if the frequency reduction coefficient due to temperature difference is denoted as K1, and K1 = 3 Hz / ℃, it means that for each degree Celsius temperature difference, the compressor frequency will decrease by 3 Hz in the next cycle. The first temperature difference corresponding to the current cycle is the difference between the outlet water temperature and the set temperature within the current cycle.

[0054] In one specific embodiment, the temperature difference frequency reduction amplitude P1 = K1 × ΔTn, where ΔTn represents the first temperature difference corresponding to the nth cycle. If the first temperature difference ΔTn is 3℃ (assuming an outlet water temperature of 47℃ and a set temperature of 50℃), then the temperature difference frequency reduction amplitude P1 = K1 × ΔTn = 3 Hz / ℃ × 3℃ = 9 Hz. Thus, it can be seen that the temperature difference frequency reduction amplitude is positively correlated with the first temperature difference corresponding to the current cycle; that is, the larger the first temperature difference corresponding to the current cycle, the larger the temperature difference frequency reduction amplitude.

[0055] The frequency reduction amplitude of the temperature difference change is determined based on the frequency reduction coefficient of the temperature difference change rate and the temperature difference slope corresponding to the current cycle. Specifically, the temperature difference slope corresponding to the current cycle is the difference between the first temperature difference corresponding to the current cycle and the second temperature difference corresponding to the previous cycle; the second temperature difference corresponding to the previous cycle is the temperature difference between the outlet water temperature and the set temperature corresponding to the previous cycle. The frequency reduction coefficient of the temperature difference change rate represents the frequency reduction amplitude of the compressor in the next cycle corresponding to each degree Celsius temperature difference change rate. For example, if the frequency reduction coefficient of the temperature difference change rate is denoted as K2, and K2 = 2 Hz / ℃, it means that for every 1 degree Celsius temperature difference change, the compressor frequency decreases by 2 Hz in the next cycle.

[0056] In one specific embodiment, the frequency conversion amplitude of the temperature difference change is P2 = K2 × ΔΔTn, where ΔΔTn represents the temperature difference slope corresponding to the nth cycle. If the temperature difference slope ΔΔTn is 3℃, then the frequency conversion amplitude of the temperature difference change is P2 = K2 × ΔΔTn = 2 Hz / ℃ × 3℃ = 6 Hz. Thus, it can be seen that the frequency conversion amplitude of the temperature difference change is positively correlated with the temperature difference slope corresponding to the current cycle; that is, the larger the temperature difference slope, the larger the frequency conversion amplitude of the temperature difference change.

[0057] The frequency reduction range during temperature change cycles is determined based on the cycle compensation coefficient, frequency compensation time, and temperature change time. The cycle compensation coefficient is determined experimentally based on heat load requirements; for example, for a 6p unit, experiments are conducted under different heat dissipation conditions to obtain a more reasonable value corresponding to different heat load requirements, thus avoiding any impact on the frequency reduction effect.

[0058] In one embodiment, the frequency reduction amplitude of the temperature difference change cycle P3 = K3 × Time / Tt; where K3 represents the cycle compensation coefficient, Time represents the frequency compensation time, which can be customized and takes a value of [1, 20] min to define the temperature change delay, and Tt represents the temperature change time, specifically the time within a preset range of temperature difference change, such as the time for a temperature difference change of 0.2 degrees. It can be understood that the smaller the heat load (or the smaller the load demand), the faster the water temperature rises, and the smaller the temperature change time Tt; conversely, the larger the heat load (or the larger the load demand), the slower the water temperature rises, and the larger the temperature change time Tt. Thus, the smaller the detected Tt, the larger the calculated frequency reduction amplitude of the temperature difference change cycle P2.

[0059] In this embodiment, a periodic compensation coefficient is introduced to improve the frequency reduction speed when the heat load is low. Specifically, without a periodic compensation coefficient, although the frequency adjustment can still be adjusted periodically based on the temperature difference between the set temperature and the outlet water temperature (e.g., a 0.2°C increase in temperature difference triggers a calculation of the next cycle frequency using the temperature difference and its rate of change), the system has a delay. Temperature changes are not uniform; the temperature might remain constant for the first two minutes, but then suddenly change, for example, rising by 0.5°C. In this case, without a periodic compensation coefficient, the frequency reduction speed in a small room would be relatively slow, leading to frequent start-stop issues.

[0060] In one specific embodiment, the frequency compensation value is calculated as follows:

[0061] ΔF=P1+P2+P3=K1×ΔTn+ K2×ΔΔTn+ K3×Time / Tt Formula (1);

[0062] In formula (1), K1 represents the temperature difference frequency reduction coefficient, ΔTn represents the first temperature difference corresponding to the nth cycle, K2 represents the temperature difference change rate frequency reduction coefficient, ΔΔTn represents the temperature difference slope corresponding to the nth cycle, K3 represents the cycle compensation coefficient, Time represents the frequency compensation time, when the temperature difference increases, Time is 0, and Tt represents the temperature change time, specifically the time within the preset range of temperature difference change, such as the time for the temperature difference to change by 0.2 degrees.

[0063] Based on the above calculation method, if the heat load is smaller (or the load demand is smaller), the water temperature rises faster, the temperature change time Tt is smaller, the corresponding temperature difference change period frequency reduction amplitude P3 is larger, and the frequency compensation value ΔF calculated in this way is also larger.

[0064] Step S13: Determine the frequency control parameters based on the current frequency and frequency compensation value, and use the frequency control parameters to control the operation of the compressor.

[0065] In one embodiment, the difference between the current frequency and the frequency compensation value is calculated to obtain the frequency control parameters.

[0066] Under normal circumstances, such as when a room has good insulation or when few rooms are heated, the heat load is relatively small, and the outlet water temperature will quickly reach the set temperature. To extend the time difference between the outlet water temperature and the set temperature, the compressor's current frequency needs to be reduced accordingly. As mentioned above, with a small heat load, the frequency reduction amplitude P3 of the temperature difference change cycle is large, resulting in a larger frequency compensation value. The difference between the current frequency and the frequency compensation value is calculated to determine the frequency control parameters. This can significantly reduce the compressor's current frequency, extend the time difference between the outlet water temperature and the set temperature, thereby reducing the start-up and shutdown frequency of the heat pump unit, improving equipment stability, and extending the equipment's service life.

[0067] Based on the above analysis, if the heat load is smaller (or the load demand is smaller), the water temperature rises faster, the temperature change time Tt is shorter, and the corresponding frequency reduction amplitude P3 of the temperature difference change cycle is larger. Consequently, the calculated frequency compensation value ΔF is larger, and the calculated frequency control parameter (current frequency - ΔF) is smaller. In the next cycle, the compressor is driven using the calculated frequency control parameter, thereby reducing the heat pump's heating capacity, slowing the temperature rise, reducing the heat pump unit's start-up and shutdown frequency, improving equipment stability, and extending equipment lifespan.

[0068] Furthermore, under heavy load conditions, such as when room insulation is insufficient or many rooms are heated, the corresponding heat load is relatively large, and the outlet water temperature will slowly reach the set temperature. If the current frequency is too low, the outlet water temperature will drop instead of rise, in which case the compressor's current frequency needs to be increased accordingly.

[0069] As mentioned above, with a large heat load and a small frequency reduction in the temperature difference cycle, the frequency compensation value is relatively small. The frequency control parameters are determined by calculating the sum of the current frequency and the frequency compensation value. This allows for a slight increase in the compressor's current frequency, accelerating temperature rise and shortening the time difference between the outlet water temperature and the set temperature, thereby improving control efficiency. Understandably, in this process, because the frequency compensation value is small, the frequency increase is relatively small, preventing excessive frequency increases and avoiding frequent start-stop issues caused by the outlet water temperature rapidly reaching the set temperature.

[0070] In one embodiment, in response to a temperature difference greater than a preset value, the frequency control parameter is determined based on the ambient temperature and the inlet water temperature. The ambient temperature refers to the external temperature, such as the outdoor temperature, which is determined by the weather and directly affects the inlet water temperature. For example, a preset frequency table can be set based on the ambient temperature and different inlet water temperatures. If the temperature difference is greater than the preset value, the corresponding frequency control parameter can be determined from the preset frequency table based on the ambient temperature and the current inlet water temperature, and this frequency control parameter is used to control the compressor.

[0071] Based on the above analysis, the technical solution of this application will be illustrated with an example. Assume: the ambient temperature is -5℃, the inlet water temperature is 43℃, the set temperature is 50℃, and the preset value is 2℃, with a preset range of (0, 2). If the outlet water temperature detected in the current cycle is 47℃, then the temperature difference between the outlet water temperature corresponding to the current frequency and the set temperature is 3℃, which is greater than the preset value of 2℃. At this time, the frequency control parameter (the frequency of the next cycle of the current cycle) Fn+1=Fch, where Fch is the maximum limiting frequency determined by the ambient temperature and the inlet water temperature. It should be noted that the maximum limiting frequency determined by the ambient temperature and the inlet water temperature is, for example, the upper limit of the compressor frequency preset by the system, such as 82Hz.

[0072] If the current cycle detects an outlet water temperature greater than 48℃, then the temperature difference between the outlet water temperature and the set temperature is within the range of (0, 2). At this time, the frequency control parameter (the frequency of the next cycle of the current cycle) Fn+1=Fn-ΔF, and the frequency compensation value ΔF is calculated using the above formula (1). Assume that the temperature difference frequency reduction coefficient K1 is 3HZ / ℃, the temperature difference change rate frequency reduction coefficient K2 is 3HZ / ℃, the cycle compensation coefficient K3 is 2, and the frequency compensation time is set to 5min. If, 1 minute after the start of the current cycle (i.e., Tt=1min), the outlet water temperature is detected to change from 48℃ to 48.5℃, then the first temperature difference corresponding to the current cycle is 1.5℃, and the slope of the temperature difference is (50-48)-(50-48.5)=0.5℃. Then the frequency compensation value ΔF=3×1.5+3×0.5+2×5 / 1=16HZ, and the frequency control parameter Fn+1=Fn-ΔF=82HZ-16HZ=66HZ. Assuming that 20 minutes after the start of the current cycle (Tt = 20 minutes), the outlet water temperature changes from 48.5℃ to 48.8℃, the first temperature difference corresponding to the current cycle is 1.2℃, and the slope of the temperature difference is (50-48.5)-(50-48.8)=0.3℃. Therefore, the frequency compensation value ΔF=3×1.2+3×0.3+2×5 / 20=5Hz, and the frequency control parameter Fn+1=Fn-ΔF=66Hz-5Hz=61Hz. Repeat the above steps until the temperature difference between the set temperature and the outlet water temperature drops to 0, at which point the equipment stops.

[0073] It should be noted that the temperature difference frequency reduction coefficient K1 and the temperature difference change rate frequency reduction coefficient K2 are determined based on the equipment's performance. If the temperature difference change rate is of greater concern, the temperature difference change rate frequency reduction coefficient K2 should be set to a higher value; if the temperature difference is of greater concern, the temperature difference frequency reduction coefficient K1 should be set to a higher value. For example, for a 5P heat pump, appropriate coefficients for temperature difference frequency reduction K1 and temperature difference change rate frequency reduction coefficient K2 need to be determined. If heating all houses with a heat demand of 5P, the temperature difference frequency reduction coefficients K1 and K2 can meet this power demand. However, heating is not always necessary for all rooms. In this case, the 5P heat supply far exceeds the heat demand of a single room. Since the temperature difference frequency reduction coefficients K1 and K2 are fixed values, the frequency reduction rate will be far from meeting the requirements, causing the outlet water temperature to quickly reach the set temperature, resulting in frequent start-ups and shutdowns of the equipment. However, according to the scheme of this application, a frequency reduction amplitude for the temperature difference change cycle is introduced, and this frequency reduction amplitude is determined based on the cycle compensation coefficient, frequency compensation time, and temperature change time. When the heated room is small, the temperature will rise rapidly, and the detected temperature change time Tt will be relatively small. This results in a larger calculated frequency reduction amplitude for the temperature difference change cycle, and thus a larger calculated frequency compensation value. The frequency control parameter obtained by subtracting the frequency compensation value from the current frequency is smaller. By using a smaller frequency control parameter to control the compressor in the next cycle, the time for the outlet water temperature to rise to the set temperature can be extended, avoiding frequent start-ups and shutdowns of the equipment.

[0074] The frequency control method of this application links the compressor frequency with heat load or load demand, and adjusts the compressor frequency according to the actual load demand, thereby adapting to different environments and improving the stability and lifespan of the compressor.

[0075] According to one or more embodiments of this application, a compressor is also provided, wherein the compressor of this application employs the above-described... Figure 1 The compressor frequency control method of the embodiment shown is used for control.

[0076] Please see Figure 3 , Figure 3 This is a schematic diagram of a framework of an embodiment of the electronic device provided by the present invention. The electronic device 80 includes a memory 81 and a processor 82 coupled to each other. The processor 82 is used to execute program instructions stored in the memory 81 to implement the steps of any of the compressor frequency control method embodiments described above. In a specific implementation scenario, the electronic device 80 may include, but is not limited to, a microcomputer or a server. In addition, the electronic device 80 may also include mobile devices such as laptops and tablets, which are not limited here.

[0077] Specifically, processor 82 controls itself and memory 81 to implement the steps of any of the compressor frequency control method embodiments described above. Processor 82 can also be referred to as a CPU (Central Processing Unit). Processor 82 may be an integrated circuit chip with signal processing capabilities. Processor 82 can also be a general-purpose processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. A general-purpose processor can be a microprocessor or any conventional processor. Furthermore, processor 82 can be implemented using integrated circuit chips.

[0078] Please see Figure 4 , Figure 4 This is a schematic diagram of a framework of an embodiment of the computer-readable storage medium provided by the present invention. The computer-readable storage medium 90 stores program instructions 901 that can be executed by a processor. The program instructions 901 are used to implement the steps of any of the above-described embodiments of the compressor frequency control method.

[0079] In some embodiments, the functions or modules of the apparatus provided in this disclosure can be used to perform the methods described in the above method embodiments. The specific implementation can be referred to the description of the above method embodiments, and for the sake of brevity, it will not be repeated here.

[0080] The description of the various embodiments above tends to emphasize the differences between the various embodiments. The similarities or similarities between them can be referred to, and for the sake of brevity, they will not be repeated here.

[0081] In the several embodiments provided in this application, it should be understood that the disclosed methods and apparatus can be implemented in other ways. For example, the apparatus implementations described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection of devices or units may be electrical, mechanical, or other forms.

[0082] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0083] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute all or part of the steps of the methods of various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0084] The above are merely embodiments of the present invention and do not limit the scope of patent protection of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A compressor frequency control method, characterized in that, include: Determine the temperature difference between the current outlet water temperature and the set temperature; In response to the temperature difference being within a preset range, a frequency compensation value is determined based on the frequency reduction amplitude of the temperature difference change cycle; wherein, the frequency reduction amplitude of the temperature difference change cycle is determined by the heat load; Based on the current frequency and the frequency compensation value, frequency control parameters are determined, and the compressor operation is controlled using the frequency control parameters. The frequency compensation value is determined based on the frequency reduction amplitude of the temperature difference change cycle, including: The frequency compensation value is determined based on the frequency reduction amplitude of the temperature difference, the frequency conversion amplitude of the temperature difference change, and the frequency reduction amplitude of the temperature difference change period. The frequency reduction amplitude of the temperature difference is determined based on the frequency reduction coefficient of the temperature difference and the first temperature difference corresponding to the current cycle; the frequency reduction amplitude of the temperature difference change is determined based on the frequency reduction coefficient of the temperature difference change rate and the temperature difference slope corresponding to the current cycle, wherein the temperature difference slope corresponding to the current cycle is the difference between the first temperature difference corresponding to the current cycle and the second temperature difference corresponding to the previous cycle; and the frequency reduction amplitude of the temperature difference change cycle is determined based on the cycle compensation coefficient, the frequency compensation time, and the temperature change time.

2. The compressor frequency control method according to claim 1, characterized in that, The heat load is negatively correlated with the frequency reduction amplitude of the temperature difference change cycle; and / or The frequency compensation value is positively correlated with the frequency reduction amplitude of the temperature difference change cycle.

3. The compressor frequency control method according to claim 1, characterized in that, Determining frequency control parameters based on the current frequency and the frequency compensation value includes: The frequency control parameters are obtained by calculating the difference between the current frequency and the frequency compensation value.

4. The compressor frequency control method according to claim 1, characterized in that, The frequency reduction amplitude of the temperature difference is positively correlated with the first temperature difference corresponding to the current cycle; and / or The frequency conversion amplitude of the temperature difference change is positively correlated with the temperature difference slope corresponding to the current cycle; and / or The frequency reduction of the temperature difference change cycle is negatively correlated with the temperature change time.

5. The compressor frequency control method according to claim 4, characterized in that, The frequency compensation value is calculated as follows: ΔF=K1×ΔTn+K2×ΔΔTn+K3×Time / Tt; Where K1 represents the temperature difference frequency reduction coefficient, ΔTn represents the first temperature difference corresponding to the nth cycle, K2 represents the temperature difference change rate frequency reduction coefficient, ΔΔTn represents the temperature difference slope corresponding to the nth cycle, K3 represents the cycle compensation coefficient, Time represents the frequency compensation time, and Tt represents the temperature change time.

6. The compressor frequency control method according to claim 1, characterized in that, In response to the temperature difference being greater than a preset value, the frequency control parameters are determined based on the ambient temperature and the inlet water temperature.

7. A compressor, characterized in that, The compressor is controlled using the compressor frequency control method described in any one of claims 1 to 6.

8. An electronic device, characterized in that, The electronic device includes a memory and a processor coupled to each other, the processor being used to execute program instructions stored in the memory, and the processor being used to execute program data to implement the compressor frequency control method as described in any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the compressor frequency control method as described in any one of claims 1 to 6.

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