A heat pump compressor frequency regulation method, device, equipment and storage medium

Abstract

The embodiment of the application discloses a heat pump compressor frequency regulation method, device, equipment and storage medium. The technical scheme provided by the embodiment of the application detects the water inlet temperature of the heat pump unit periodically, determines a first temperature difference according to the difference between the water inlet temperature and a preset target temperature, determines a temperature difference change rate according to the difference between the first temperature difference and a second temperature difference, the second temperature difference being the first temperature difference determined in the previous period, determines a target frequency modulation parameter according to the first temperature difference, the temperature difference change rate and a preset reference relationship, and adjusts the frequency of the compressor of the heat pump unit according to the target frequency modulation parameter, so that the water inlet temperature reaches the preset target temperature within a preset target temperature reaching time. The problem of low accuracy of heat pump compressor frequency regulation can be solved, and the accuracy of heat pump compressor frequency regulation is improved.

Description

Technical Field

[0001] This application relates to the field of heat pump control technology, and in particular to a method, apparatus, equipment and storage medium for frequency regulation of a heat pump compressor. Background Technology

[0002] An air-source heat pump unit is a device that uses air as a low-temperature heat source, drives a compressor with a small amount of electricity to increase the low-grade heat energy in the air to a higher grade heat energy for heating. Due to its advantages such as high efficiency and environmental friendliness, heat pump units are widely used in people's work and daily life. As the application scenarios of heat pump units become more widespread, the control requirements for the compressors of these units are also becoming more stringent. Traditional fixed-frequency compressors, due to their fixed operating speed, are difficult to adapt to changing usage needs. Therefore, variable-frequency technology has been introduced, and the use of variable-frequency compressors in heat pump units has become a trend.

[0003] Variable frequency compressors adjust the motor frequency through a variable frequency drive (also known as a frequency converter), thereby changing the compressor speed and achieving frequency conversion. The core function of a frequency converter is to dynamically adjust the motor's operating frequency according to load demand, achieving precise control of the compressor's output power. Existing variable frequency control typically uses a PID controller for frequency regulation. The performance of a PID controller is highly dependent on the accurate setting of parameters (such as proportional gain, integral time, and derivative time). In practical applications, due to variations in system characteristics and operating environment, finding a suitable combination of PID parameters often requires extensive experimentation and debugging. Furthermore, once PID parameters are set, they may need to be readjusted when system characteristics or environmental conditions change to ensure control effectiveness. Therefore, in actual operation, given the complexity of the actual operating environment, the accuracy of frequency regulation using a PID controller is relatively low. Summary of the Invention

[0004] This application provides a method, apparatus, device, and storage medium for frequency control of a heat pump compressor, which can solve the problem of low accuracy in frequency control of heat pump compressors and improve the accuracy of frequency control of heat pump compressors.

[0005] In a first aspect, embodiments of this application provide a method for controlling the frequency of a heat pump compressor, used in a heat pump unit, the method comprising:

[0006] The inlet water temperature of the heat pump unit is periodically monitored, and the first temperature difference is determined based on the difference between the inlet water temperature and the preset target temperature.

[0007] The rate of change of temperature difference is determined based on the difference between the first temperature difference and the second temperature difference, where the second temperature difference is the first temperature difference determined in the previous cycle.

[0008] The target frequency modulation parameters are determined based on the first temperature difference, the rate of change of temperature difference, and the preset reference relationship;

[0009] The compressor frequency of the heat pump unit is adjusted according to the target frequency regulation parameters so that the inlet water temperature reaches the preset target temperature within the preset target temperature time.

[0010] Furthermore, based on the first temperature difference, the rate of change of temperature difference, and the preset reference relationship, the target frequency modulation parameters are determined, including:

[0011] The first dimension parameter is determined based on the first temperature difference and the preset comparison relationship;

[0012] The second dimension parameter is determined based on the temperature difference change rate and the preset comparison relationship;

[0013] The target frequency modulation parameters are determined based on the intersection of the first-dimensional parameters and the second-dimensional parameters.

[0014] Furthermore, based on the first temperature difference and a preset comparison relationship, the first dimension parameters are determined, including:

[0015] A preset temperature difference range is defined, and the temperature difference range has a first preset correlation with the first dimension parameter.

[0016] By comparing the first temperature difference with the temperature difference range, the target temperature difference range corresponding to the first temperature difference is determined;

[0017] The first dimension parameter corresponding to the target temperature difference range is determined based on the first preset comparison relationship;

[0018] Based on the temperature difference change rate and the preset control relationship, the second dimension parameters are determined, including:

[0019] A preset temperature difference change rate range is defined, and a second preset correlation exists between the temperature difference change rate range and the second dimension parameter.

[0020] By comparing the rate of change of temperature difference with the range of the rate of change of temperature difference, the target range of the rate of change of temperature difference is determined.

[0021] The second dimension parameter corresponding to the target temperature difference change rate range is determined based on the second preset comparison relationship.

[0022] Furthermore, the heat pump compressor frequency control method also includes:

[0023] Periodically monitor the operating frequency of the compressor in the heat pump unit;

[0024] If the operating frequency remains at the preset minimum operating frequency for a period of time exceeding a preset time threshold, the compressor will be shut down.

[0025] Furthermore, the heat pump compressor frequency control method also includes:

[0026] Periodically monitor the outlet water temperature of the heat pump unit;

[0027] When the outlet water temperature reaches the preset shutdown temperature, the compressor is controlled to stop.

[0028] Furthermore, before periodically monitoring the inlet water temperature of the heat pump unit and determining the first temperature difference based on the difference between the inlet water temperature and the preset target temperature, the process includes:

[0029] Obtain the current operating parameters of the heat pump unit;

[0030] The current operating mode of the heat pump unit is determined based on the operating parameters. The operating mode includes heating mode or cooling mode.

[0031] Receives a temperature setting signal and determines a preset target temperature value based on the temperature setting signal. The preset target temperature value is the heating target temperature value in heating mode or the cooling target temperature value in cooling mode.

[0032] Furthermore, when the outlet water temperature reaches the preset shutdown temperature, the compressor is controlled to shut down, including:

[0033] When the heat pump unit is currently operating in heating mode, the compressor will be shut down when the outlet water temperature is greater than the sum of the heating target temperature and the shutdown hysteresis.

[0034] When the heat pump unit is currently operating in cooling mode, the compressor is controlled to stop when the outlet water temperature is less than the sum of the cooling target temperature and the shutdown hysteresis.

[0035] In a second aspect, embodiments of this application provide a heat pump compressor frequency control device for a heat pump unit, the heat pump compressor frequency control device comprising:

[0036] The temperature difference comparison module is used to periodically detect the inlet water temperature of the heat pump unit and determine the first temperature difference based on the difference between the inlet water temperature and the preset target temperature.

[0037] The temperature difference change determination module is used to determine the temperature difference change rate based on the difference between the first temperature difference and the second temperature difference, where the second temperature difference is the first temperature value determined in the previous cycle.

[0038] The target frequency determination module is used to determine the target frequency modulation parameters based on the first temperature difference, the rate of change of temperature difference, and a preset reference relationship;

[0039] The frequency control module is used to adjust the frequency of the compressor of the heat pump unit according to the target frequency adjustment parameters so that the inlet water temperature reaches the preset target temperature within the preset target temperature time.

[0040] In a third aspect, embodiments of this application provide a heat pump compressor frequency control device, comprising:

[0041] Memory and one or more processors;

[0042] Memory, used to store one or more programs;

[0043] When one or more programs are executed by one or more processors, the one or more processors implement the heat pump compressor frequency control method as described in the first aspect.

[0044] In a fourth aspect, embodiments of this application provide a storage medium for storing computer-executable instructions, which, when executed by a computer processor, are used to perform the heat pump compressor frequency control method as described in the first aspect.

[0045] In this embodiment, when regulating the compressor frequency of a heat pump unit, the inlet water temperature of the heat pump unit is periodically detected. A first temperature difference is determined based on the difference between the inlet water temperature and a preset target temperature. The temperature difference change rate is determined based on the difference between the first temperature difference and a second temperature difference, wherein the second temperature difference is the first temperature difference determined in the previous cycle. A target frequency regulation parameter is determined based on the first temperature difference, the temperature difference change rate, and a preset reference relationship. The compressor frequency of the heat pump unit is adjusted according to the target frequency regulation parameter so that the inlet water temperature reaches the preset target temperature within a preset target temperature reaching time. By employing the aforementioned technical means, the target frequency regulation parameter can be determined jointly through two dimensions: the first temperature difference and the rate of change of temperature difference. The compressor frequency can then be directly adjusted based on this target frequency regulation parameter, thus avoiding the problem of low accuracy in heat pump compressor frequency regulation. Compared to existing PID control methods, this embodiment uses periodic detection to obtain the first temperature difference and the rate of change of temperature difference for compressor frequency regulation. In complex operating environments, the target frequency regulation parameter can be determined based on the first temperature difference and the rate of change of temperature difference corresponding to the actual operating effect, thereby improving the accuracy of compressor frequency regulation in the heat pump unit. Furthermore, determining the target frequency based on both the first temperature difference and the rate of change of temperature difference enables multi-dimensional joint regulation, further improving the accuracy of compressor frequency regulation in the heat pump unit. Attached Figure Description

[0046] Figure 1 This is a flowchart of a heat pump compressor frequency control method provided in an embodiment of this application;

[0047] Figure 2 This is a schematic diagram of the structure of a heat pump compressor frequency control device provided in an embodiment of this application;

[0048] Figure 3 This is a schematic diagram of the structure of a heat pump compressor frequency control device provided in an embodiment of this application. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of this application clearer, specific embodiments of this application will be described in further detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely for explaining this application and not for limiting it. It should also be noted that, for ease of description, only the parts relevant to this application are shown in the drawings, not all of them. Before discussing exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although the flowcharts describe operations (or steps) as sequential processes, many of these operations can be performed in parallel, concurrently, or simultaneously. Furthermore, the order of the operations can be rearranged. A process can be terminated when its operation is completed, but it may also have additional steps not included in the drawings. A process can correspond to a method, function, procedure, subroutine, subroutine, etc.

[0050] Variable frequency technology adjusts the compressor's frequency by monitoring parameters such as ambient temperature and system pressure in real time, ensuring it operates at its optimal efficiency. For example, in cooling mode, when the indoor temperature approaches the set value, the inverter reduces the compressor's operating frequency to decrease cooling capacity and avoid energy waste. In heating mode, when the indoor temperature is low, the inverter increases the compressor's operating frequency to increase heating capacity, ensuring a warm and comfortable indoor environment. This flexible frequency control not only improves the system's energy efficiency ratio but also significantly enhances control accuracy and response speed. Variable frequency compressors can quickly adjust cooling or heating capacity according to actual needs, avoiding the mechanical losses and increased energy consumption caused by frequent start-stop cycles of fixed frequency compressors. Therefore, the use of variable frequency compressors in heat pump units is becoming a trend.

[0051] Existing frequency conversion control typically uses PID controllers for frequency regulation. The performance of PID controllers is highly dependent on the accurate setting of parameters (such as proportional gain, integral time, and derivative time). In practical applications, due to variations in system characteristics and operating environment, finding a suitable combination of PID parameters often requires extensive experimentation and debugging. Furthermore, once PID parameters are set, they may need to be readjusted to maintain control effectiveness when system characteristics or environmental conditions change. Therefore, in actual operation, given the complexity of the actual operating environment, the accuracy of frequency regulation using PID controllers is relatively low.

[0052] Existing PID controllers, which regulate frequency, perform well for linear systems. However, for air source heat pump systems with nonlinear characteristics, the operating characteristics of the heat pump unit change with factors such as temperature or load. As a result, PID controllers struggle to adjust their control strategies in real time, leading to a decrease in the accuracy and stability of system control.

[0053] In real-world operation, there are diverse usage scenarios, such as cooling, hot water, heating, and drying, where system load demands and operating states frequently change. Due to their feedback control characteristics, PID controllers typically require a certain amount of time to sense and respond to these changes, resulting in a slow overall system response speed and difficulty in quickly adapting to different application scenarios. Since rapid response can improve system energy efficiency and enhance user experience, existing frequency control methods based on PID controllers suffer from slow response speeds and poor user experience.

[0054] In actual operation, heat pump systems are frequently affected by various disturbances, such as changes in ambient temperature and fluctuations in grid voltage. PID controllers have poor robustness to these disturbances, which can easily lead to system instability and affect control performance.

[0055] Therefore, the traditional frequency regulation method based on PID control has certain limitations in terms of parameter adjustment, nonlinear system control, response speed and anti-interference ability, resulting in relatively low frequency regulation accuracy of variable frequency compressors in actual use.

[0056] Based on this, a heat pump compressor frequency control method according to embodiments of this application is provided to solve the technical problem of low accuracy in existing heat pump compressor frequency control. The heat pump compressor frequency control method provided in this application aims to control the compressor frequency of a heat pump unit by periodically detecting the inlet water temperature of the heat pump unit, determining a first temperature difference based on the difference between the inlet water temperature and a preset target temperature, determining a temperature difference change rate based on the difference between the first temperature difference and a second temperature difference, wherein the second temperature difference is the first temperature difference determined in the previous cycle, determining a target frequency adjustment parameter based on the first temperature difference, the temperature difference change rate, and a preset correlation, and adjusting the compressor frequency of the heat pump unit according to the target frequency adjustment parameter to ensure that the inlet water temperature reaches the preset target temperature within a preset target temperature attainment time. By employing the aforementioned technical means, the target frequency regulation parameter can be determined jointly through two dimensions: the first temperature difference and the rate of change of temperature difference. The compressor frequency can then be directly adjusted based on this target frequency regulation parameter, thus avoiding the problem of low accuracy in heat pump compressor frequency regulation. Compared to existing methods using PID control, this embodiment uses periodic detection to obtain the first temperature difference and the rate of change of temperature difference for compressor frequency regulation. In complex operating environments, the target frequency regulation parameter can be determined based on the first temperature difference and the rate of change of temperature difference corresponding to the actual operating effect, thereby improving the accuracy of compressor frequency regulation in the heat pump unit. Furthermore, determining the target frequency based on both the first temperature difference and the rate of change of temperature difference enables multi-dimensional joint regulation, further improving the accuracy of compressor frequency regulation in the heat pump unit.

[0057] Figure 1 A flowchart of a heat pump compressor frequency control method according to an embodiment of this application is provided. The heat pump compressor frequency control method provided in this embodiment can be executed by a heat pump compressor frequency control device. This heat pump compressor frequency control device can be implemented by software and / or hardware. The heat pump compressor frequency control device can consist of two or more physical entities, or it can consist of a single physical entity. Generally, the heat pump compressor frequency control device can be the electronic equipment corresponding to a heat pump unit, such as an air conditioner or underfloor heating system.

[0058] The following description uses an air conditioner as the main example to illustrate the frequency control method of a heat pump compressor. (Refer to...) Figure 1 This heat pump compressor frequency control method is used in heat pump units, and specifically includes:

[0059] S101. Periodically detect the inlet water temperature of the heat pump unit and determine the first temperature difference based on the difference between the inlet water temperature and the preset target temperature.

[0060] When the heat pump unit is turned on, the compressor starts and is controlled to run at a preset plateau frequency for a preset time. By controlling the compressor to run at the plateau frequency for a period of time after startup, temperature fluctuations during the startup phase can be reduced, thereby improving user comfort. It also helps to improve the stability of the internal pressure of the heat pump unit, thus improving the overall reliability of the heat pump unit.

[0061] After the compressor runs at a preset platform frequency for a preset time, the current operating parameters of the heat pump unit are acquired. Based on these parameters, the current operating mode of the heat pump unit is determined, which may be heating or cooling. A temperature setting signal is received, and a preset target temperature value is determined based on this signal. This temperature setting signal can be input by the user via remote control or automatically triggered by the controller. For example, if the temperature before the heat pump unit was shut down was 26℃, then after the heat pump unit is restarted, the controller automatically triggers the temperature setting signal to determine the preset target temperature value as 26℃.

[0062] In one embodiment, the preset target temperature value is either the heating target temperature value in heating mode or the cooling target temperature value in cooling mode. In heating mode, a temperature setting signal is received, and the heating target temperature value is determined based on the temperature setting signal. In cooling mode, a temperature setting signal is received, and the cooling target temperature value is determined based on the temperature setting signal.

[0063] After determining the preset target temperature, the inlet water temperature of the heat pump unit is periodically monitored. The first temperature difference is determined based on the difference between the inlet water temperature and the preset target temperature. For example, assuming the cycle is 10 minutes and the preset target temperature is 26℃, the inlet water temperature is monitored every 10 minutes. If the detected inlet water temperature is 30℃, the first temperature difference for this cycle is determined to be 4℃ based on the difference between the inlet water temperature of 30℃ and the preset target temperature of 26℃.

[0064] As described above, by periodically detecting the inlet water temperature and obtaining the first temperature difference for this cycle based on the difference between the inlet water temperature and the preset target temperature, the frequency adjustment parameter can be determined by the changes in the first temperature difference corresponding to multiple cycles. Compared with the existing PID-based control method, this embodiment adjusts the frequency adjustment parameter based on the first temperature difference corresponding to the actual operating results, which can improve the accuracy of compressor frequency control.

[0065] S102. Determine the rate of change of temperature difference based on the difference between the first temperature difference and the second temperature difference, wherein the second temperature difference is the first temperature difference determined in the previous cycle.

[0066] The system periodically monitors the inlet water temperature and determines the first temperature difference for the current cycle based on the difference between the inlet water temperature and the preset target temperature. The first temperature difference determined in the previous cycle is recorded as the second temperature difference. The rate of change of temperature difference can be determined based on the difference between the first and second temperature differences. For example, the rate of change of temperature difference is obtained by dividing the difference between the first and second temperature differences by the cycle (duration). For instance, if the first temperature difference (i.e., the second temperature difference) determined in the previous cycle is 8℃, and the first temperature difference determined in this cycle is 4℃, the difference is 4℃, and the cycle (duration) is 25 minutes, then the rate of change of temperature difference is 0.16℃ / min.

[0067] As described above, by periodically detecting the inlet water temperature, the first temperature difference of the corresponding period and the rate of change of the temperature difference between two adjacent periods are obtained. Subsequently, the target frequency modulation parameters can be determined based on the two dimensions of the first temperature difference and the rate of change of the temperature difference, so as to realize multi-dimensional consideration and improve the accuracy of temperature control.

[0068] S103. Determine the target frequency value based on the first temperature difference, the rate of change of temperature difference, and the preset comparison relationship.

[0069] In one embodiment, a preset temperature difference range is defined, and this temperature difference range has a first preset correlation with a first dimension frequency (i.e., a frequency modulation parameter). For example, the larger the temperature difference, the larger the corresponding frequency modulation parameter. For instance, under the same temperature difference change rate, the frequency modulation parameter corresponding to the temperature difference range (6,8] (in °C) is a 180% increase, the frequency modulation parameter corresponding to the temperature difference range (4,6] (in °C) is a 160% increase, the frequency modulation parameter corresponding to the temperature difference range (2,4] (in °C) is a 140% increase, and the frequency modulation parameter corresponding to the temperature difference range (1,2] (in °C) is a 120% increase. It should be noted that the frequency modulation parameter can also be a frequency modulation speed, for example, a frequency modulation parameter of 10% increase every 5 minutes. It should also be noted that a preset adjustment frequency F01 is defined, and the frequency modulation parameter here is based on the adjustment frequency F01 for frequency increase / decrease. The specific value of the adjustment frequency F01 can be... The settings are based on actual conditions. This embodiment uses an adjustment frequency F01 of 4Hz as an example for explanation. For instance, if the frequency adjustment parameter is an increase of 160%, then within this cycle, the frequency needs to be increased by 4Hz × 160% = 6.4Hz, meaning an increase of 6.4Hz is required. Similarly, if the frequency adjustment parameter is a decrease of 160%, according to 4Hz × (-160%) = (-6.4Hz), the frequency needs to be decreased by 6.4Hz. A preset temperature difference change rate range is established, and this range has a second preset correlation with the second dimension parameter (i.e., the frequency adjustment parameter). For example, under the same temperature difference value, the frequency adjustment parameter corresponding to the temperature difference change rate range (-0.4, -0.2] (unit: °C / min) is an increase of 140Hz. The frequency modulation parameter corresponding to the temperature difference change rate range (-0.2, 0.05] (unit: ℃ / min) is 100% up, 80% up, 60% up, 0.4% up, 0.4% up, and 0.6% down. The frequency modulation parameter corresponding to the temperature difference change rate range (0.6, +∞] (unit: ℃ / min) is 80% down. Integrating the first and second preset comparison relationships, two dimensions can be obtained. A complete set of preset control relationships. As mentioned above, the first preset control relationship indicates that a larger temperature difference corresponds to a larger frequency adjustment parameter, allowing the compressor to operate at a higher frequency to quickly reduce the temperature difference and thus shorten the time to reach the preset target temperature, thereby improving the user experience. The second preset control relationship increases the frequency when the temperature difference change rate decreases rapidly to accelerate the reduction of the temperature difference, and decreases the frequency when the temperature difference change rate increases rapidly. This indicates that the current temperature difference change rate meets the requirement of reaching the preset target temperature within the preset time, allowing for appropriate frequency reduction to achieve energy savings without affecting the achievement of the preset target temperature within the preset time, further improving the user experience.

[0070] In one embodiment, a reference table with a preset reference relationship is provided, as shown in Table 1 below.

[0071]

[0072]

[0073] Table 1

[0074] In Table 1, △T (°C) represents the temperature difference range, and Φ (°C / min) represents the temperature difference change rate range. R03 represents the shutdown hysteresis value. Based on the preset correspondence in Table 1, when the corresponding first temperature difference is obtained through periodic detection, the first temperature difference can be compared with the temperature difference range to determine the target temperature difference range corresponding to the first temperature difference. For example, if the first temperature difference is 4°C, its corresponding target temperature difference range is (2,4] (unit:°C), i.e., zone D. The first dimension parameter corresponding to the target temperature difference range is determined according to the first preset correspondence. The first dimension parameter corresponding to the target temperature difference range consists of multiple parameters, such as... Figure 1 The frequency modulation parameters for the entire column corresponding to the medium temperature difference range (2, 4] (in °C) (i.e., the column corresponding to zone D) are all first-dimensional parameters, namely, frequency increase of 140%, frequency increase of 100%, frequency increase of 60%, 0% (i.e., no adjustment), frequency decrease of 60%, frequency decrease of 100%, and frequency decrease of 140%. The temperature difference change rate is compared with the temperature difference change rate range to determine the target temperature difference change rate range. For example, if the temperature difference change rate is 0.16 °C / min, its corresponding target temperature difference change rate range is (0.05, 0.2] (in °C / min), i.e., zone d. The second-dimensional parameters corresponding to the target temperature difference change range are determined according to the second preset comparison relationship. The first-dimensional parameters corresponding to the target temperature difference change rate range are multiple parameters, for example... Figure 1 The frequency modulation parameters for the entire row corresponding to the temperature difference change rate range (0.05, 0.2] (unit: °C / min) (i.e., the row corresponding to zone d) are all second-dimensional parameters, namely, frequency increase of 100%, frequency increase of 80%, frequency increase of 60%, 0% (i.e., no adjustment), 0% (i.e., no adjustment), 0% (i.e., no adjustment), and frequency decrease of 60%. The intersection of the first-dimensional and second-dimensional parameters is determined as the corresponding target frequency modulation parameter. For example, if the intersection of the first-dimensional and second-dimensional parameters is 0% (i.e., the intersection of zone D and zone d in Table 1), then the target frequency modulation parameter is determined to be 0%, which can be understood as maintaining the current compressor operating frequency without frequency adjustment.

[0075] As described above, by periodically detecting the inlet water temperature, the first temperature difference of the corresponding period and the rate of change of the temperature difference between two adjacent periods are obtained. The target frequency modulation parameters are determined based on the two dimensions of the first temperature difference and the rate of change of the temperature difference, so as to realize multi-dimensional consideration and improve the accuracy of temperature control.

[0076] S104. Adjust the frequency of the compressor of the heat pump unit according to the target frequency adjustment parameters so that the inlet water temperature reaches the preset target temperature within the preset target temperature time.

[0077] The target temperature reach time is the preset time for the heat pump unit, for example, 20 minutes. This means that regardless of the initial inlet water temperature, the preset target temperature must be reached within 20 minutes. This target temperature reach time is set at the factory. Based on the target temperature reach time and cycle time, and the preset correlation between the aforementioned frequency adjustment parameters and the first temperature difference and temperature difference change rate, the compressor frequency can be adjusted according to the target frequency adjustment parameters corresponding to the preset correlation, based on the corresponding first temperature difference and temperature difference change rate, to achieve the corresponding preset target temperature within the target temperature reach time.

[0078] After determining the target frequency adjustment parameters for the current cycle, the compressor frequency of the heat pump unit is adjusted according to these parameters to ensure the inlet water temperature reaches the preset target temperature within the preset target temperature reach time. For example, if the target frequency adjustment parameter for the current cycle is 0%, it can be understood that the preset target temperature can be reached within the target temperature reach time simply by continuing to operate the compressor at its current operating frequency. Therefore, the current compressor operating frequency can be maintained without frequency adjustment. Alternatively, if the target frequency adjustment parameter for the next cycle is -60% (i.e., a 60% reduction in frequency), which is the intersection of the corresponding column in section D and the corresponding row in section e of Table 1, it means that the preset target temperature can be reached earlier than the target temperature reach time by operating the compressor at its current operating frequency. To save energy and maintain the operational stability of the heat pump unit, the compressor operating frequency can be appropriately reduced, for example, by 60%. This achieves energy saving and improves the operational stability of the heat pump unit, while still ensuring the preset target temperature is reached within the target temperature reach time, thereby enhancing the user experience.

[0079] To facilitate the controller's rapid parameter determination based on preset temperature difference ranges and temperature difference change ranges and preset reference relationships, the preset reference relationships can be compiled into Table 2. The corresponding frequency regulation parameters can be directly replaced with the corresponding parameter codes. Subsequently, the parameter codes corresponding to the current cycle can be determined by looking up the table based on the first temperature difference and temperature difference change rate obtained from the cycle detection. The corresponding parameter codes can then be directly called to regulate the compressor frequency, thereby improving the overall working efficiency of compressor regulation.

[0080] Table 2 is shown below:

[0081]

[0082]

[0083] Table 2

[0084] In Table 2, △T (°C) represents the temperature difference range, and Φ (°C / min) represents the temperature difference change rate range. Based on the preset correspondence in Table 2, when the corresponding first temperature difference is obtained through periodic detection, the first temperature difference can be compared with the temperature difference range △T to determine the target temperature difference range corresponding to the first temperature difference. The temperature difference change rate corresponding to this period is then compared with the temperature difference change rate range to determine the target temperature difference change rate range. Based on the column corresponding to the target temperature difference range and the row corresponding to the target temperature difference change rate range, the intersecting target parameter code (e.g., P00) is determined, and the compressor is controlled to perform the corresponding frequency adjustment based on this target parameter code (e.g., P00). The specific content of the corresponding parameter codes in Table 2 can be found in Table 3, as shown below:

[0085]

[0086]

[0087]

[0088] Table 3

[0089] In Table 3, the frequency up-modulation speeds are P01 > P02 > P03 > P04 > P05 > P06 > P07 > P08 > P09 > P10; and the frequency down-modulation speeds are P11 < P12 < P13 < P14 < P15 < P16 < P17 < P18 < P19.

[0090] In one embodiment, the preset temperature target is the heating target temperature in heating mode. For example, when the heat pump unit is currently operating in heating mode, a temperature setting signal is received, and the heating target temperature is determined based on the temperature setting signal. In heating mode, the inlet water temperature of the heat pump unit is periodically detected, and a first temperature difference is determined based on the difference between the inlet water temperature and the first target temperature. For example, the first temperature difference ΔT = R01 - T01, where R01 is the heating target temperature and T01 is the inlet water temperature; the temperature difference change rate Φ = (ΔT(n-1) - ΔT) / M01; where M01 is the frequency modulation period, which can be understood as the duration of the periodic detection, and ΔT(n-1) is the first temperature difference determined in the previous period.

[0091] In one embodiment, the preset temperature target is the cooling target temperature in cooling mode. For example, when the heat pump unit is currently operating in cooling mode, a temperature setting signal is received, and the cooling target temperature is determined based on the temperature setting signal. In cooling mode, the inlet water temperature of the heat pump unit is periodically detected, and a first temperature difference is determined based on the difference between the inlet water temperature and the first target temperature. For example, the first temperature difference ΔT = T01 - R02, where R02 is the cooling target temperature and T01 is the inlet water temperature; the temperature difference change rate Φ = (ΔT - ΔT(n-1)) / M01; where M01 is the frequency modulation period, which can be understood as the duration of the periodic detection, and ΔT(n-1) is the first temperature difference determined in the previous period.

[0092] In both heating and cooling modes, the inlet water temperature can be periodically monitored to obtain the first temperature difference and the rate of change of temperature difference for the corresponding cycle. Based on the preset comparison relationship (i.e., Table 2 above), the first temperature difference can be compared with the temperature difference interval ΔT to determine the target temperature difference interval corresponding to the first temperature difference. The rate of change of temperature difference for the current cycle is compared with the interval of temperature difference change rate to determine the target temperature difference change rate interval corresponding to the rate of change of temperature difference. According to the column corresponding to the target temperature difference interval and the row corresponding to the target temperature difference change rate interval, the intersecting target parameter code (e.g., P00) is determined, and the compressor is controlled to perform the corresponding frequency adjustment processing according to the target parameter code (e.g., P00).

[0093] For example, assuming the first temperature difference (i.e., the second temperature difference) determined in the previous cycle is 8℃, and the first temperature difference determined in this cycle is 4℃, the difference is 4℃. With a cycle time of 25 minutes, the temperature difference change rate is 0.16℃ / min. Therefore, corresponding to zones d and D in Table 2, the corresponding target parameter code is determined to be P00. As shown in Table 3, the frequency adjustment corresponding to P00 is 0%, so no adjustment to the compressor frequency is needed. For example, assuming the target parameter code for the current cycle is determined to be P01 based on a table lookup, it means the detection result for this cycle is in zone A with a large temperature difference and in zone a where the temperature is rapidly decreasing, indicating a high current capacity requirement and necessitating frequency increase. As another example, assuming the current cycle is in zone G where the temperature difference is close to the preset target temperature and in zone g where the temperature rises rapidly, it means the current capacity requirement is not high, and the frequency can be appropriately reduced.

[0094] It should be noted that the preset adjustment frequency F01 is used as the reference for frequency adjustment. The specific value of the adjustment frequency F01 can be set according to the actual situation. For example, if the target parameter code is determined to be P01, the frequency adjustment amount in this cycle is F01 × P01. Referring to Table 3, P01 corresponds to a frequency increase adjustment speed of 1, that is, the required frequency increase is F01 × frequency increase adjustment speed of 1. For example, assuming the adjustment frequency F01 is 4Hz and the frequency increase adjustment speed of 1 corresponding to P01 is 200%, the frequency adjustment amount in this cycle is 4Hz × 200% = 8Hz. Therefore, the compressor's operating frequency is increased by 8Hz to meet the preset target temperature within the preset target temperature time.

[0095] As described above, by setting the frequency adjustment parameters (and parameter codes) corresponding to the temperature difference zone and temperature difference change rate zone in the background through a preset reference relationship, after obtaining the corresponding first temperature difference and temperature difference change rate through subsequent periodic detection, the corresponding target frequency adjustment parameters (and target parameter codes) can be directly determined by looking up the table. The compressor is then frequency-adjusted directly according to the target frequency adjustment parameters (and target parameter codes), realizing automatic frequency adjustment control of the heating / cooling speed based on the target temperature reaching time. Based on the preset reference relationship (i.e., Table 2), the optimal frequency of the compressor can be quickly locked. Compared with the frequent adjustment method of the existing PID controller, the method of this embodiment improves the operational stability and reliability of the heat pump unit, while reducing energy damage during the adjustment process, thereby improving the energy efficiency of the heat pump unit and enhancing the overall user experience.

[0096] Based on the above implementation, the operating frequency of the compressor in the heat pump unit is periodically monitored. If the operating frequency remains at a preset minimum operating frequency for a period exceeding a preset time threshold, the compressor is controlled to shut down. For example, assuming the compressor is detected to be continuously operating at the minimum operating frequency F02 for a continuous time M02 (the preset maximum duration threshold for low frequency), it means that the current energy has met the user's needs, so the compressor is shut down to achieve energy saving and improve the user experience.

[0097] Based on the above implementation, the outlet water temperature of the heat pump unit is periodically monitored; when the outlet water temperature reaches a preset shutdown temperature, the compressor is controlled to shut down. For example, when the heat pump unit is currently operating in heating mode, the compressor is controlled to shut down when the outlet water temperature is greater than the sum of the heating target temperature and the shutdown hysteresis. For instance, when T02 > R01 + R03, the compressor is controlled to shut down, where T02 is the outlet water temperature, R01 is the heating target temperature, and R03 is the shutdown hysteresis, which is a preset threshold. When the heat pump unit is currently operating in cooling mode, the compressor is controlled to shut down when the outlet water temperature is less than the sum of the cooling target temperature and the shutdown hysteresis. For instance, when T02 < R01 - R03, the compressor is controlled to shut down, where T02 is the outlet water temperature, R01 is the cooling target temperature, and R03 is the shutdown hysteresis, which is a preset threshold. As mentioned above, the machine stops when the outlet water temperature reaches the user's set requirement, thus achieving intelligent operation and improving the user experience.

[0098] As mentioned above, by tabulating frequency parameters, better control performance can be provided in complex and ever-changing environments, and the operational stability of heat pump units can be improved. By combining parameter combinations with energy demand settings under different scenarios, air source heat pump systems can more efficiently and intelligently meet a variety of application needs.

[0099] As described above, when regulating the compressor frequency of the heat pump unit, the inlet water temperature of the heat pump unit is periodically detected. The first temperature difference is determined based on the difference between the inlet water temperature and the preset target temperature. The temperature difference change rate is determined based on the difference between the first temperature difference and the second temperature difference, where the second temperature difference is the first temperature difference determined in the previous cycle. The target frequency regulation parameter is determined based on the first temperature difference, the temperature difference change rate, and the preset reference relationship. The compressor frequency of the heat pump unit is adjusted according to the target frequency regulation parameter so that the inlet water temperature reaches the preset target temperature within the preset target temperature reaching time. By employing the aforementioned technical means, the target frequency regulation parameter can be determined jointly through two dimensions: the first temperature difference and the rate of change of temperature difference. The compressor frequency can then be directly adjusted based on this target frequency regulation parameter, thus avoiding the problem of low accuracy in heat pump compressor frequency regulation. Compared to existing PID control methods, this embodiment uses periodic detection to obtain the first temperature difference and the rate of change of temperature difference for compressor frequency regulation. In complex operating environments, the target frequency regulation parameter can be determined based on the first temperature difference and the rate of change of temperature difference corresponding to the actual operating effect, thereby improving the accuracy of compressor frequency regulation in the heat pump unit. Furthermore, determining the target frequency based on both the first temperature difference and the rate of change of temperature difference enables multi-dimensional joint regulation, further improving the accuracy of compressor frequency regulation in the heat pump unit.

[0100] Based on the above embodiments, Figure 2This is a schematic diagram of a heat pump compressor frequency control device provided in an embodiment of this application. (Reference) Figure 2 The heat pump compressor frequency control device provided in this embodiment is used in heat pump units. The heat pump compressor frequency control device specifically includes: a temperature difference comparison module 21, a temperature difference change determination module 22, a target frequency determination module 23, and a frequency control module 24.

[0101] Among them, the temperature difference comparison module 21 is used to periodically detect the inlet water temperature of the heat pump unit and determine the first temperature difference based on the difference between the inlet water temperature and the preset target temperature.

[0102] The temperature difference change determination module 22 is used to determine the temperature difference change rate based on the difference between the first temperature difference and the second temperature difference, where the second temperature difference is the first temperature value determined in the previous cycle.

[0103] The target frequency determination module 23 is used to determine the target frequency modulation parameters based on the first temperature difference, the rate of change of temperature difference, and a preset reference relationship;

[0104] The frequency control module 24 is used to adjust the frequency of the compressor of the heat pump unit according to the target frequency adjustment parameters so that the inlet water temperature reaches the preset target temperature within the preset target temperature time.

[0105] In one embodiment, the temperature difference change determination module 22 includes a first determination submodule, a second determination submodule, and a third determination submodule;

[0106] The first determining submodule is used to determine the first dimension parameter based on the first temperature difference and the preset comparison relationship;

[0107] The second determination submodule is used to determine the second dimension parameters based on the temperature difference change rate and the preset comparison relationship;

[0108] The third determination submodule is used to determine the target frequency modulation parameters based on the intersection of the first dimension parameters and the second dimension parameters.

[0109] In one embodiment, the first determining submodule includes a first interval region unit, a first comparison unit, and a first determining unit;

[0110] The first interval region unit is used to preset the temperature difference interval, and the temperature difference interval has a first preset correspondence with the first dimension parameter;

[0111] The first comparison unit is used to compare the first temperature difference with the temperature difference range to determine the target temperature difference range corresponding to the first temperature difference.

[0112] The first determining unit is used to determine the first dimension parameter corresponding to the target temperature difference range according to the first preset comparison relationship;

[0113] The second determination submodule includes a second interval region unit, a second comparison unit, and a second determination unit;

[0114] The second interval region unit is used to preset the temperature difference change rate interval, and the temperature difference change rate interval has a second preset correspondence with the second dimension parameter;

[0115] The second comparison unit is used to compare the rate of change of temperature difference with the range of the rate of change of temperature difference to determine the target range of the rate of change of temperature difference.

[0116] The second determining unit is used to determine the second dimension parameter corresponding to the target temperature difference change rate range based on the second preset comparison relationship.

[0117] In one embodiment, the heat pump compressor frequency control device further includes a frequency detection module and a shutdown control module;

[0118] The frequency detection module is used to periodically detect the operating frequency of the compressor in the heat pump unit;

[0119] The shutdown control module is used to control the compressor to shut down when the operating frequency remains at a preset minimum operating frequency for a period of time exceeding a preset time threshold.

[0120] In one embodiment, the heat pump compressor frequency control device further includes an outlet water temperature detection module;

[0121] The outlet water temperature detection module is used to periodically detect the outlet water temperature of the heat pump unit.

[0122] The shutdown control module is also used to control the compressor to stop when the outlet water temperature reaches the preset shutdown temperature.

[0123] In one embodiment, the heat pump compressor frequency control device further includes an operating parameter acquisition module, an operating mode confirmation module, and a temperature setting module;

[0124] The operating parameter acquisition module is used to acquire the current operating parameters of the heat pump unit;

[0125] The operation mode confirmation module is used to determine the current operation mode of the heat pump unit based on the operating parameters. The operation mode includes heating mode or cooling mode.

[0126] The temperature setting module is used to receive the temperature setting signal and determine the preset target temperature value based on the temperature setting signal. The preset target temperature value is the heating target temperature value in heating mode or the cooling target temperature value in cooling mode.

[0127] In one embodiment, the shutdown control module includes a first shutdown control submodule and a second shutdown control submodule;

[0128] The first shutdown control submodule is used to control the compressor to shut down when the heat pump unit is currently in heating mode and the outlet water temperature is greater than the sum of the heating target temperature and the shutdown hysteresis.

[0129] The second shutdown control submodule is used to control the compressor to shut down when the outlet water temperature is less than the sum of the cooling target temperature and the shutdown hysteresis when the heat pump unit is currently operating in cooling mode.

[0130] As described above, when regulating the compressor frequency of the heat pump unit, the inlet water temperature of the heat pump unit is periodically detected. The first temperature difference is determined based on the difference between the inlet water temperature and the preset target temperature. The temperature difference change rate is determined based on the difference between the first temperature difference and the second temperature difference, where the second temperature difference is the first temperature difference determined in the previous cycle. The target frequency regulation parameter is determined based on the first temperature difference, the temperature difference change rate, and the preset reference relationship. The compressor frequency of the heat pump unit is adjusted according to the target frequency regulation parameter so that the inlet water temperature reaches the preset target temperature within the preset target temperature reaching time. By employing the aforementioned technical means, the target frequency regulation parameter can be determined jointly through two dimensions: the first temperature difference and the rate of change of temperature difference. The compressor frequency can then be directly adjusted based on this target frequency regulation parameter, thus avoiding the problem of low accuracy in heat pump compressor frequency regulation. Compared to existing methods using PID control, this embodiment uses periodic detection to obtain the first temperature difference and the rate of change of temperature difference for compressor frequency regulation. In complex operating environments, the target frequency regulation parameter can be determined based on the first temperature difference and the rate of change of temperature difference corresponding to the actual operating effect, thereby improving the accuracy of compressor frequency regulation in the heat pump unit. Furthermore, determining the target frequency based on both the first temperature difference and the rate of change of temperature difference enables multi-dimensional joint regulation, further improving the accuracy of compressor frequency regulation in the heat pump unit.

[0131] The heat pump compressor frequency control device provided in this application embodiment can be used to execute the heat pump compressor frequency control method provided in the above embodiment, and has corresponding functions and beneficial effects.

[0132] This application provides a heat pump compressor frequency control device, referring to... Figure 3 The heat pump compressor frequency control device includes: a processor 31, a memory 32, a communication module 33, an input device 34, and an output device 35. The number of processors and the number of memories in the heat pump compressor frequency control device can be one or more. The processor, memory, communication module, input device, and output device of the heat pump compressor frequency control device can be connected via a bus or other means.

[0133] The memory 32, as a computer-readable storage medium, can be used to store software programs, computer-executable programs, and modules, such as program instructions / modules corresponding to the heat pump compressor frequency control method described in any embodiment of this application (e.g., the temperature difference comparison module, temperature difference change determination module, target frequency determination module, and frequency control module in the heat pump compressor frequency control device). The memory may primarily include a program storage area and a data storage area. The program storage area may store the operating system and at least one application program required for a function; the data storage area may store data created based on the use of the device, etc. Furthermore, the memory may include high-speed random access memory and non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state storage device. In some instances, the memory may further include memory remotely located relative to the processor, and these remote memories can be connected to the device via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0134] The communication module 33 is used for data transmission.

[0135] The processor 31 executes various functional applications and data processing of the device by running software programs, instructions and modules stored in the memory, thereby realizing the above-mentioned heat pump compressor frequency control method.

[0136] Input device 34 can be used to receive input digital or character information, and to generate key signal inputs related to user settings and function control of the device. Output device 35 may include display devices such as a display screen.

[0137] The heat pump compressor frequency control device provided above can be used to execute the heat pump compressor frequency control method provided in the above embodiments, and has corresponding functions and beneficial effects.

[0138] This application embodiment also provides a storage medium for storing computer-executable instructions. When executed by a computer processor, the computer-executable instructions are used to execute a heat pump compressor frequency control method. The heat pump compressor frequency control method includes: periodically detecting the inlet water temperature of the heat pump unit and determining a first temperature difference based on the difference between the inlet water temperature and a preset target temperature; determining a temperature difference change rate based on the difference between the first temperature difference and a second temperature difference, wherein the second temperature difference is the first temperature difference determined in the previous cycle; determining a target frequency adjustment parameter based on the first temperature difference, the temperature difference change rate, and a preset reference relationship; and adjusting the frequency of the compressor of the heat pump unit according to the target frequency adjustment parameter so that the inlet water temperature reaches the preset target temperature within a preset target temperature reaching time.

[0139] Storage medium – any type of memory device or storage device. The term “storage medium” is intended to include: mounting media, such as CD-ROM, floppy disk, or magnetic tape devices; computer system memory or random access memory, such as DRAM, DDR RAM, SRAM, EDO RAM, Rambus RAM, etc.; non-volatile memory, such as flash memory, magnetic media (e.g., hard disk or optical storage); registers or other similar types of memory elements, etc. Storage medium may also include other types of memory or combinations thereof. Furthermore, storage medium may reside in a first computer system in which the program is executed, or it may reside in a different second computer system connected to the first computer system via a network (such as the Internet). The second computer system can provide program instructions to the first computer for execution. The term “storage medium” can include two or more storage media residing in different locations (e.g., in different computer systems connected via a network). Storage medium may store program instructions (e.g., specifically implemented as a computer program) executable by one or more processors.

[0140] Of course, the storage medium for storing computer-executable instructions provided in the embodiments of this application is not limited to the heat pump compressor frequency control method described above, but can also perform related operations in the heat pump compressor frequency control method provided in any embodiment of this application.

[0141] The heat pump compressor frequency control device, storage medium, and heat pump compressor frequency control equipment provided in the above embodiments can execute the heat pump compressor frequency control method provided in any embodiment of this application. For technical details not described in detail in the above embodiments, please refer to the heat pump compressor frequency control method provided in any embodiment of this application.

[0142] The above description is merely a preferred embodiment and the technical principles employed in this application. This application is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions that can be made by those skilled in the art will not depart from the scope of protection of this application. Therefore, although this application has been described in detail through the above embodiments, this application is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of this application, the scope of which is determined by the scope of the claims.

Claims

1. A method for frequency control of a heat pump compressor, characterized in that, Used in heat pump units, including: The inlet water temperature of the heat pump unit is periodically detected, and a first temperature difference is determined based on the difference between the inlet water temperature and the preset target temperature. The rate of change of temperature difference is determined based on the difference between the first temperature difference and the second temperature difference, where the second temperature difference is the first temperature difference determined in the previous cycle. The target frequency modulation parameters are determined based on the first temperature difference, the rate of change of the temperature difference, and a preset comparison relationship; The compressor frequency of the heat pump unit is adjusted according to the target frequency adjustment parameters so that the inlet water temperature reaches the preset target temperature within the preset target temperature time. The step of determining the target frequency modulation parameters based on the first temperature difference, the rate of change of the temperature difference, and a preset reference relationship includes: The first dimension parameter is determined based on the first temperature difference and the preset comparison relationship; The second dimension parameter is determined based on the temperature difference change rate and the preset comparison relationship; The target frequency modulation parameter is determined based on the intersection of the first dimension parameter and the second dimension parameter; The step of determining the first dimension parameter based on the first temperature difference and a preset comparison relationship includes: A preset temperature difference range is defined, and the temperature difference range has a first preset correlation relationship with the first dimension parameter. The first temperature difference is compared with the temperature difference range to determine the target temperature difference range corresponding to the first temperature difference; The first dimension parameter corresponding to the target temperature difference range is determined according to the first preset comparison relationship; The step of determining the second dimension parameter based on the temperature difference change rate and a preset comparison relationship includes: A preset temperature difference change rate range is defined, and the temperature difference change rate range has a second preset correlation relationship with the second dimension parameter. By comparing the temperature difference change rate with the temperature difference change rate range, the target temperature difference change rate range corresponding to the temperature difference change rate is determined; The second dimension parameter corresponding to the target temperature difference change rate range is determined based on the second preset comparison relationship.

2. The method according to claim 1, characterized in that, The method further includes: The operating frequency of the compressor of the heat pump unit is periodically monitored; When the operating frequency remains at the preset minimum operating frequency for a period of time exceeding a preset time threshold, the compressor is controlled to stop.

3. The method according to claim 1, characterized in that, The method further includes: Periodically monitor the outlet water temperature of the heat pump unit; When the outlet water temperature reaches the preset shutdown temperature, the compressor is controlled to stop.

4. The method according to claim 3, characterized in that, Before periodically detecting the inlet water temperature of the heat pump unit and determining the first temperature difference based on the difference between the inlet water temperature and the preset target temperature, the process includes: Obtain the current operating parameters of the heat pump unit; The current operating mode of the heat pump unit is determined based on the operating parameters, and the operating mode includes heating mode or cooling mode. Receive a temperature setting signal, and determine the preset target temperature value based on the temperature setting signal. The preset target temperature value is the heating target temperature value in heating mode or the cooling target temperature value in cooling mode.

5. The method according to claim 4, characterized in that, The step of controlling the compressor to stop when the outlet water temperature reaches the preset shutdown temperature includes: When the heat pump unit is currently operating in heating mode, the compressor is controlled to stop when the outlet water temperature is greater than the sum of the heating target temperature and the shutdown hysteresis. When the heat pump unit is currently operating in cooling mode, the compressor is controlled to stop when the outlet water temperature is less than the sum of the cooling target temperature and the shutdown hysteresis.

6. A frequency control device for a heat pump compressor, characterized in that, Used in heat pump units, including: The temperature difference comparison module is used to periodically detect the inlet water temperature of the heat pump unit and determine the first temperature difference based on the difference between the inlet water temperature and the preset target temperature. The temperature difference change determination module is used to determine the temperature difference change rate based on the difference between the first temperature difference and the second temperature difference, wherein the second temperature difference is the first temperature value determined in the previous cycle. The target frequency determination module is used to determine the target frequency modulation parameters based on the first temperature difference, the rate of change of the temperature difference, and a preset reference relationship; The frequency control module is used to adjust the frequency of the compressor of the heat pump unit according to the target frequency adjustment parameters, so that the inlet water temperature reaches the preset target temperature within the preset target temperature time. The target frequency determination module includes a first determination submodule, a second determination submodule, and a third determination submodule. The first determining submodule is used to determine the first dimension parameter based on the first temperature difference and the preset comparison relationship; The second determination submodule is used to determine the second dimension parameters based on the temperature difference change rate and the preset comparison relationship; The third determination submodule is used to determine the target frequency modulation parameters based on the intersection of the first dimension parameters and the second dimension parameters; The first determining submodule includes a first interval region unit, a first comparison unit, and a first determining unit; The first interval region unit is used to preset the temperature difference interval, and the temperature difference interval has a first preset correspondence with the first dimension parameter; The first comparison unit is used to compare the first temperature difference with the temperature difference range to determine the target temperature difference range corresponding to the first temperature difference. The first determining unit is used to determine the first dimension parameter corresponding to the target temperature difference range according to the first preset comparison relationship; The second determination submodule includes a second interval region unit, a second comparison unit, and a second determination unit; The second interval region unit is used to preset the temperature difference change rate interval, and the temperature difference change rate interval has a second preset correspondence with the second dimension parameter; The second comparison unit is used to compare the rate of change of temperature difference with the range of the rate of change of temperature difference to determine the target range of the rate of change of temperature difference. The second determining unit is used to determine the second dimension parameter corresponding to the target temperature difference change rate range based on the second preset comparison relationship.

7. A frequency control device for a heat pump compressor, characterized in that, include: Memory and one or more processors; The memory is used to store one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the method as described in any one of claims 1-5.

8. A storage medium for storing computer-executable instructions, characterized in that, The computer-executable instructions, when executed by a processor, are used to perform the method as described in any one of claims 1-5.

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