Frequency control method of compressor, controller, heat pump water chiller-heater unit and medium

Abstract

The invention provides a frequency control method of a compressor, a controller, a heat pump water chiller-heater unit and a medium, and the method comprises the following steps: determining the current required frequency of the compressor according to the actual water outlet temperature and the target water temperature under the condition that the shutdown type is temperature-reaching shutdown or fault shutdown; when the heat pump water chiller-heater unit has energy demand to recover starting, the initial frequency of the compressor is determined according to the total energy demand parameter; and determining the target frequency of the compressor according to the current required frequency and the initial frequency. For temperature-reaching shutdown or fault shutdown, the method comprises the following steps: calculating the current required frequency at the start energy demand recovery moment according to the actual water outlet temperature and the target water temperature in the shutdown process of the unit until the unit recovers the energy demand start operation; the target frequency of starting operation of the compressor is jointly determined according to the current demand frequency calculated according to the unit starting recovery energy demand moment and the initial frequency calculated according to the energy demand, frequent starting and stopping of the unit caused by too large starting frequency are avoided, and improvement of the temperature control precision of the unit and reduction of energy loss are facilitated.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioning, and particularly relates to a frequency control method for a compressor, a controller, a heat pump chiller-heater unit, and a medium. Background Art

[0002] In the related art, for the situation where a heat pump chiller-heater unit restarts after shutdown, the compressor usually directly increases its frequency to the maximum allowable operating frequency under the current working condition after running through the startup platform, or operates at an initial frequency determined by energy demand calculation.

[0003] However, for the current control method, when starting up after reaching the set temperature and shutting down or after a fault shutdown, the initial frequency of the compressor does not match the actual demand, which may cause the compressor to start and stop frequently, with relatively high operating energy consumption, large temperature fluctuations on the user side, and poor user experience. Summary of the Invention

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. For this purpose, the present application provides a frequency control method for a compressor, a controller, a heat pump chiller-heater unit, and a medium, aiming to reduce the problem of frequent start and stop of the unit caused by too large starting frequency, which is beneficial to improving the temperature control accuracy of the unit and reducing energy loss.

[0005] In a first aspect, an embodiment of the present application provides a frequency control method for a compressor, including:

[0006] Obtaining the shutdown type of the heat pump chiller-heater unit;

[0007] In the case where the shutdown type is shutdown due to reaching the set temperature or fault shutdown, obtaining the actual water outlet temperature and the target water temperature, and determining the current demand frequency of the compressor according to the actual water outlet temperature and the target water temperature;

[0008] When the heat pump chiller-heater unit has energy demand to resume startup, obtaining the total energy demand parameter, and determining the initial frequency of the compressor according to the total energy demand parameter;

[0009] Determining the target frequency of the compressor according to the current demand frequency and the initial frequency, and controlling the compressor to start at the target frequency.

[0010] According to some embodiments of the present application, the determining the current demand frequency of the compressor according to the actual water outlet temperature and the target water temperature includes:

[0011] Determining the current demand frequency of the compressor according to the actual water outlet temperature and the target water temperature every preset time interval.

[0012] According to some embodiments of the present application, the actual outlet water temperature includes the current actual outlet water temperature of the current cycle and the historical actual outlet water temperature of the historical cycle; determining the current required frequency of the compressor according to the actual outlet water temperature and the target water temperature includes:

[0013] Determining the temperature difference between the current actual outlet water temperature and the target water temperature;

[0014] Determining the change difference between the current actual outlet water temperature and the historical actual outlet water temperature;

[0015] Determining the current required frequency of the compressor according to the temperature difference and the change difference.

[0016] According to some embodiments of the present application, determining the current required frequency of the compressor according to the temperature difference and the change difference includes:

[0017] Obtaining the historical required frequency of the historical cycle;

[0018] Determining a first frequency correction value according to the temperature difference and the change difference;

[0019] Determining the current required frequency of the compressor according to the historical required frequency, the first frequency correction value and the second frequency correction value, wherein the second frequency correction value is determined by the model of the heat pump cold and hot water unit.

[0020] According to some embodiments of the present application, determining the current required frequency of the compressor according to the historical required frequency, the first frequency correction value and the second frequency correction value includes:

[0021] Inputting the historical required frequency, the first frequency correction value and the second frequency correction value into a first frequency calculation model to obtain the current required frequency of the compressor;

[0022] Wherein, the first frequency calculation model includes a first input variable, a second input variable and a third input variable. The first input variable is used to be assigned the historical required frequency, the second input variable is used to be assigned the first frequency correction value, and the third input variable is used to be assigned the second frequency correction value. The sum of the product of the second input variable and the third input variable and the first input variable is the current required frequency.

[0023] According to some embodiments of the present application, the frequency control method further includes:

[0024] When the shutdown type is manual shutdown or shutdown of the mode-switching unit, obtaining the total energy demand parameter;

[0025] Determine the initial frequency of the compressor according to the total energy demand parameter;

[0026] Determine the target frequency of the compressor according to the initial frequency, and control the compressor to start at the target frequency.

[0027] According to some embodiments of the present application, the determining the initial frequency of the compressor according to the total energy demand parameter includes:

[0028] Obtain the outdoor ambient temperature and / or the model capacity, and determine the target correction coefficient according to the outdoor ambient temperature and / or the model capacity;

[0029] Determine the initial frequency of the compressor according to the target correction coefficient and the total energy demand parameter.

[0030] According to some embodiments of the present application, the target correction coefficient includes a third frequency correction value and a fourth frequency correction value. The third frequency correction value is determined based on the outdoor ambient temperature or the model capacity, and the fourth frequency correction value is determined based on the outdoor ambient temperature. The determining the initial frequency of the compressor according to the target correction coefficient and the total energy demand parameter includes:

[0031] Input the third frequency correction value, the fourth frequency correction value, and the total energy demand parameter into the second frequency calculation model to obtain the initial frequency of the compressor;

[0032] Wherein, the second frequency calculation model includes a fourth input variable, a fifth input variable, and a sixth input variable. The fourth input variable is used to be assigned the third frequency correction value, the fifth input variable is used to be assigned the total energy demand parameter, the sixth input variable is used to be assigned the fourth frequency correction value, and the sum of the product of the fourth input variable and the fifth input variable and the sixth input variable is the initial frequency.

[0033] According to some embodiments of the present application, the determining the target frequency of the compressor according to the current demand frequency and the initial frequency includes one of the following:

[0034] When the current demand frequency is greater than zero and the minimum value of the current demand frequency and the initial frequency is less than the preset minimum allowable operating frequency, use the minimum allowable operating frequency as the target frequency of the compressor;

[0035] When the current demand frequency is greater than zero and the minimum value of the current demand frequency and the initial frequency is greater than the preset maximum allowable operating frequency, use the maximum allowable operating frequency as the target frequency of the compressor;

[0036] When the current required frequency is greater than zero, and the minimum value of the current required frequency and the initial frequency is greater than or equal to the minimum allowable operating frequency and less than or equal to the maximum allowable operating frequency, the minimum value of the current required frequency and the initial frequency is used as the target frequency of the compressor;

[0037] When the current required frequency is less than or equal to zero, the current required frequency is recalculated until the current required frequency is greater than zero, and then the target frequency of the compressor is determined according to the current required frequency and the initial frequency.

[0038] According to some embodiments of the present application, determining the target frequency of the compressor according to the initial frequency includes one of the following:

[0039] When the initial frequency is less than the preset minimum allowable operating frequency, the minimum allowable operating frequency is used as the target frequency of the compressor;

[0040] When the initial frequency is greater than the preset maximum allowable operating frequency, the maximum allowable operating frequency is used as the target frequency of the compressor;

[0041] When the initial frequency is greater than or equal to the minimum allowable operating frequency and less than or equal to the maximum allowable operating frequency, the initial frequency is used as the target frequency of the compressor.

[0042] In a second aspect, an embodiment of the present application further provides a controller, including: a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor runs the computer program, it executes the frequency control method of the compressor in the first aspect as described above.

[0043] In a third aspect, an embodiment of the present application provides a heat pump chiller, including the controller in the second aspect as described above.

[0044] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, storing computer-executable instructions for executing the frequency control method of the compressor in the first aspect as described above.

[0045] According to the technical solution of the embodiment of the present application, it has at least the following beneficial effects: First, the embodiment of the present application will obtain the shutdown type of the heat pump cold and hot water unit; then, in the case where the shutdown type is temperature-reached shutdown or fault shutdown, the embodiment of the present application will obtain the actual outlet water temperature and the target water temperature, and determine the current required frequency of the compressor according to the actual outlet water temperature and the target water temperature; next, when the heat pump cold and hot water unit has the ability to resume startup, the embodiment of the present application will obtain the total energy demand parameter, and determine the initial frequency of the compressor according to the total energy demand parameter; finally, the embodiment of the present application will determine the target frequency of the compressor according to the current required frequency and the initial frequency, and control the compressor to start at the target frequency. For the case of temperature-reached shutdown or fault shutdown, in the process of unit shutdown, the embodiment of the present application needs to calculate the current required frequency of the compressor at the moment of resuming startup energy demand according to the actual outlet water temperature and the target water temperature. Until the unit resumes startup operation with energy demand, the current required frequency calculated according to the moment of resuming startup energy demand of the unit and the initial frequency calculated according to the energy demand jointly determine the target frequency of the compressor startup operation, avoiding the too large startup frequency resulting in frequent start and stop of the unit, which is beneficial to improving the temperature control accuracy of the unit and reducing energy loss.

[0046] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The drawings are used to provide a further understanding of the technical solution of the present application, and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application, and do not constitute a limitation to the technical solution of the present application.

[0048] Figure 1 is a schematic structural diagram of a heat pump cold and hot water unit provided by an embodiment of the present application;

[0049] Figure 2 is a flowchart of a frequency control method for a compressor provided by an embodiment of the present application;

[0050] Figure 3 is a flowchart of a frequency control method for a compressor provided by another embodiment of the present application;

[0051] Figure 4 is a flowchart of a frequency control method for a compressor provided by another embodiment of the present application;

[0052] Figure 5 is a flowchart of a frequency control method for a compressor provided by another embodiment of the present application;

[0053] Figure 6 is a flowchart of a frequency control method for a compressor provided by another embodiment of the present application;

[0054] Figure 7 is a flowchart of a frequency control method for a compressor provided by another embodiment of the present application;

[0055] Figure 8 is a flowchart of a frequency control method for a compressor provided by another embodiment of the present application;

[0056] Figure 9 is a flowchart of a frequency control method for a compressor provided by another embodiment of the present application;

[0057] Figure 10 is a flowchart of a frequency control method for a compressor provided by another embodiment of the present application;

[0058] Figure 11 is an overall flowchart of a frequency control method for a compressor provided by an embodiment of the present application;

[0059] Figure 12 is a schematic diagram of a controller for executing a frequency control method for a compressor provided by an embodiment of the present application. Detailed Embodiments

[0060] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present application and should not be construed as a limitation of the present application.

[0061] In the description of the present application, it should be understood that for orientation descriptions, such as up, down, front, back, left, right, etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application.

[0062] In the description of the present application, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, exceeding, etc. are understood as not including the number itself, and above, below, within, etc. are understood as including the number itself. If there is a description of first and second, it is only for the purpose of distinguishing technical features and should not be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or the sequence relationship of the indicated technical features.

[0063] In the description of the present application, unless otherwise clearly defined, words such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present application in combination with the specific content of the technical solution.

[0064] In some cases, for the restart of a heat pump chiller after shutdown, the compressor usually directly increases its frequency to the maximum allowable operating frequency under the current working conditions after running through the startup platform, or operates at the initial frequency determined by energy demand calculation.

[0065] However, for the current control method, when restarting after reaching the set temperature or due to a fault shutdown, the initial frequency of the compressor does not match the actual demand, which may cause the compressor to start and stop frequently, resulting in relatively high operating energy consumption, large fluctuations in the temperature on the user side, and poor user experience.

[0066] Based on the above situation, the embodiments of the present application propose a frequency control method for a compressor, a controller, a heat pump chiller, and a medium, aiming to reduce the problem of frequent start and stop of the unit caused by an overly large starting frequency, which is beneficial to improving the temperature control accuracy of the unit and reducing energy loss.

[0067] The following further elaborates on each embodiment of the heat pump chiller of the present application with reference to the accompanying drawings.

[0068] As Figure 1 shown, Figure 1 is a schematic structural diagram of a heat pump chiller provided by an embodiment of the present application.

[0069] In one embodiment, the heat pump chiller of the embodiment of the present application is provided with a water inlet and a water outlet. Among them, the water inlet is connected to one end of the indoor heat exchange device through a water supply pipeline, and the water outlet is connected to the other end of the indoor heat exchange device through a water return pipeline.

[0070] In one embodiment, the heat pump chiller of the embodiment of the present application includes, but is not limited to, an outdoor unit 100 and a hydraulic module 200. Among them, the hydraulic module 200 is communicatively connected to the outdoor unit 100, and the hydraulic module 200 is used to supply the water heat-exchanged by the outdoor unit 100 to the indoor heat exchange device.

[0071] In addition, in one embodiment, information exchange can be carried out between the outdoor unit 100 and the hydraulic module 200, and linkage control can also be carried out. For example, the hydraulic module 200 can obtain parameters such as the water flow rate, inlet water temperature, or outlet water temperature of its inlet and outlet water, and send the above parameters to the outdoor unit 100. Then, the outdoor unit 100 can control the frequency of the compressor 110 based on the received parameters, such as increasing the frequency, decreasing the frequency, or maintaining the frequency unchanged.

[0072] It should be noted that for the above-mentioned outdoor unit 100 and hydraulic module 200, the two can be integrated into a single device, or can be set in a split form. The embodiments of the present application do not specifically limit the structural form between the outdoor unit 100 and the hydraulic module 200.

[0073] It can be understood that the communication method between the outdoor unit 100 and the hydraulic module 200 can be a wired communication method, such as power line carrier communication, etc.; it can also be a wireless communication method, such as WIFI communication or Bluetooth communication, etc. The embodiments of the present application do not specifically limit the communication method between the outdoor unit 100 and the hydraulic module 200.

[0074] In addition, in one embodiment, as Figure 1 shown, the outdoor unit 100 includes but is not limited to a compressor 110, a first heat exchanger 120, and a second heat exchanger 130. Among them, the compressor 110, the first heat exchanger 120, and the second heat exchanger 130 are connected through a refrigerant pipeline.

[0075] For Figure 1 the heat pump cold and hot water unit shown, when the heat pump cold and hot water unit is in the cooling mode, the first heat exchanger 120 serves as an evaporator, and the second heat exchanger 130 serves as a condenser; when the heat pump cold and hot water unit is in the heating mode, the first heat exchanger 120 serves as a condenser, and the second heat exchanger 130 serves as an evaporator.

[0076] It should be noted that regarding the above-mentioned first heat exchanger 120, it can specifically be a water-fluorine heat exchanger. Among them, the water-fluorine heat exchanger includes but is not limited to a first heat exchange coil and a second heat exchange coil. In addition, the second heat exchanger 130 includes but is not limited to a third heat exchange coil; the compressor 110, the first heat exchange coil, and the third heat exchange coil together form a circulation loop with fluorine as the refrigerant; the second heat exchange coil is connected to the indoor heat exchange device through the hydraulic module 200, and the second heat exchange coil, the hydraulic module 200, and the indoor heat exchange device together form another circulation loop with water as the refrigerant. Among them, the first heat exchange coil and the second heat exchange coil in the water-fluorine heat exchanger are not connected, and heat exchange can occur between the first heat exchange coil and the second heat exchange coil.

[0077] Specifically, when the heat pump cold and hot water unit is in the cooling mode, the first heat exchanger 120 serves as an evaporator. Since the fluorine refrigerant in the first heat exchange coil absorbs the heat from the water in the second heat exchange coil under the evaporation effect, the temperature of the water in the second heat exchange coil will drop and become cold water. Then, the hydraulic module 200 will supply the cold water to the indoor heat exchange device, thereby cooling the indoor environment through the indoor heat exchange device.

[0078] In addition, when the heat pump cold and hot water unit is in the heating mode, the first heat exchanger 120 serves as a condenser. Since the fluorine refrigerant in the first heat exchange coil releases heat under the condensation effect and transfers the heat to the water in the second heat exchange coil, the temperature of the water in the second heat exchange coil will rise and become hot water. Then, the hydraulic module 200 will supply the hot water to the indoor heat exchange device, thereby heating the indoor environment through the indoor heat exchange device.

[0079] In one embodiment, as Figure 1 shown, the outdoor unit 100 further includes, but is not limited to, a four-way valve 140. Among them, the four-way valve 140 is provided with four ports. The first port is used to communicate with the exhaust port of the compressor 110, the second port is used to communicate with the first heat exchanger 120, the third port is used to communicate with the second heat exchanger 130, and the third port is used to communicate with the suction port of the compressor 110.

[0080] Specifically, the outdoor unit 100 can control the flow direction of the refrigerant by controlling the connection relationship of the four ports in the four-way valve 140, thereby changing the heat exchange mode of the heat pump cold and hot water unit.

[0081] Among them, when the first port and the second port of the four-way valve 140 are connected, and the third port and the fourth port are connected, at this time, the heat pump cold and hot water unit is in the heating mode. Among them, the refrigerant flow direction in the heating mode can be as Figure 1 shown by the solid arrows at the position of the outdoor unit 100 in the figure. Specifically, the refrigerant from the exhaust port of the compressor 110 will pass through the four-way valve 140, the first heat exchanger 120 and the second heat exchanger 130 in sequence, and then return to the suction port of the compressor 110 through the four-way valve 140.

[0082] In addition, when the first port and the third port of the four-way valve 140 are connected, and the second port and the fourth port are connected, at this time, the heat pump cold and hot water unit is in the cooling mode. Among them, the refrigerant flow direction in the cooling mode can be as Figure 1 shown by the dashed arrows at the position of the outdoor unit 100 in the figure. Specifically, the refrigerant from the exhaust port of the compressor 110 will pass through the four-way valve 140, the second heat exchanger 130 and the first heat exchanger 120 in sequence, and then return to the suction port of the compressor 110 through the four-way valve 140.

[0083] In one embodiment, as Figure 1 shown, the outdoor unit 100 further includes, but is not limited to, a throttling component 150. Among them, the throttling component 150 is arranged between the first heat exchanger 120 and the second heat exchanger 130.

[0084] It can be understood that for the above-mentioned throttling component 150, it can be an electronic expansion valve or a capillary tube. The embodiment of the present application does not specifically limit the type of the throttling component 150.

[0085] In one embodiment, for the second heat exchange coil of the water-fluorine heat exchanger, it is connected to the hydraulic module 200 and connected to the indoor heat exchange equipment through the hydraulic module 200. Specifically, the hydraulic module 200 includes, but is not limited to, a water supply pipeline and a water return pipeline. The second heat exchange coil is connected to the water inlet of the indoor heat exchange equipment through the water supply pipeline, and is connected to the water outlet of the indoor heat exchange equipment through the water return pipeline. A water pump may also be provided on the water supply pipeline and / or the water return pipeline for supplying water to the indoor heat exchange equipment.

[0086] In addition, it can be understood that the number of the above-mentioned indoor heat exchange equipment can be two, three, or more. The embodiments of the present application do not specifically limit the number of indoor heat exchange equipment.

[0087] In addition, it should be noted that regarding the installation positions of the above-mentioned indoor heat exchange equipment, multiple indoor heat exchange equipment can be installed in the same spatial area. For example, multiple indoor heat exchange equipment can be installed in a room at the same time, or multiple indoor heat exchange equipment can be installed in a living room at the same time; in addition, multiple indoor heat exchange equipment can also be installed in different spatial areas. For example, a part of the indoor heat exchange equipment is installed in a room, and another part of the indoor heat exchange equipment is installed in a living room, or a part of the indoor heat exchange equipment is installed in a first room, and another part of the indoor heat exchange equipment is installed in a second room. Regarding the installation positions of the above-mentioned indoor heat exchange equipment, the embodiments of the present application do not specifically limit this.

[0088] In addition, it should be noted that regarding the installation positions of the indoor heat exchange equipment in the spatial area, the embodiments of the present application can install the indoor heat exchange equipment at the ceiling position of the room, or can install the indoor heat exchange equipment at the floor position of the room, or can reasonably allocate the installation positions of the indoor heat exchange equipment according to actual usage needs. The embodiments of the present application do not specifically limit this.

[0089] In addition, it should be noted that regarding the equipment types of the above-mentioned indoor heat exchange equipment, it can be an air handling unit terminal formed by matching with a fan coil, or a radiant terminal formed by matching with a radiant panel, such as a radiant panel on the ceiling or a floor heating system, or other types of terminal equipment. The embodiments of the present application do not specifically limit this.

[0090] Based on the hardware structures of the heat pump cold and hot water units in the above various embodiments, the following respectively present the various embodiments of the frequency control method of the compressor of the present application.

[0091] As Figure 2 shown, Figure 2 is a flowchart of the frequency control method of the compressor provided by an embodiment of the present application; this frequency control method can be applied to the heat pump cold and hot water unit in the above embodiment, and can include, but is not limited to, step S210, step S220, step S230, and step S240.

[0092] Step S210: Obtain the shutdown type of the heat pump cold and hot water unit;

[0093] Step S220: When the shutdown type is temperature - reached shutdown or fault shutdown, obtain the actual outlet water temperature and the target water temperature, and determine the current required frequency of the compressor according to the actual outlet water temperature and the target water temperature;

[0094] Step S230: When the heat pump cold and hot water unit has the energy demand and resumes startup, obtain the total energy demand parameter, and determine the initial frequency of the compressor according to the total energy demand parameter;

[0095] Step S240: Determine the target frequency of the compressor according to the current required frequency and the initial frequency, and control the compressor to start at the target frequency.

[0096] In an embodiment, when the heat pump cold and hot water unit shuts down, the embodiment of the present application detects the shutdown type of the heat pump cold and hot water unit. If it is detected that the shutdown type is temperature - reached shutdown or fault shutdown, the embodiment of the present application detects the actual outlet water temperature of the heat pump cold and hot water unit and obtains the target water temperature set by the user, and calculates the current required frequency based on the actual outlet water temperature and the target water temperature; in addition, if the heat pump cold and hot water unit has the energy demand and resumes startup, the embodiment of the present application calculates the initial frequency of the compressor based on the total energy demand parameter; finally, the embodiment of the present application jointly determines the target frequency for the compressor to start and run based on the current required frequency and the initial frequency.

[0097] It should be noted that for the above - mentioned temperature - reached shutdown situation, it may refer to shutting down after the actual outlet water temperature reaches the target water temperature, and over time, the actual outlet water temperature may not reach the target water temperature, and at this time, the compressor will restart. Or, it may also refer to shutting down after the actual indoor environmental temperature reaches the set indoor environmental temperature, and over time, the actual indoor environmental temperature may not reach the set indoor environmental temperature, and at this time, the compressor will restart. The embodiment of the present application does not make specific limitations on the above - mentioned temperature - reached shutdown situation.

[0098] In addition, it should be noted that for the above - mentioned fault shutdown situation, it may refer to the shutdown situation caused by compressor failure, or the shutdown situation caused by hydraulic module failure, or the shutdown situation caused by various sensor failures, or the shutdown situation caused by other component failures. The embodiment of the present application does not make specific limitations on this.

[0099] It can be understood that regarding the above - mentioned actual outlet water temperature, specifically, it may refer to the water temperature at the outlet of the heat pump cold and hot water unit. The embodiment of the present application can set a temperature sensor at the outlet of the heat pump cold and hot water unit and use this temperature sensor to detect the actual outlet water temperature.

[0100] In addition, it can be understood that the above target water temperature can be set in advance by the user. Specifically, it can be set through a remote controller, or through a mobile phone, or through voice. The embodiments of the present application do not specifically limit the setting method of the target water temperature.

[0101] It should be noted that for the above-mentioned available demand, it can refer to the case where the actual indoor environmental temperature is lower than the set indoor environmental temperature. In this case, it can be considered that the heat pump cold and hot water unit has an available demand. When the heat pump cold and hot water unit has an available demand, the heat pump cold and hot water unit will resume starting and obtain the total available demand parameters of the indoor heat exchange equipment.

[0102] Among them, it should be noted that regarding the total available demand parameters of all the above indoor heat exchange equipment, specifically, it can refer to the total available demand parameters of the actually connected and operating indoor heat exchange equipment, and it is not necessary to include the indoor heat exchange equipment that is not operating in the calculation.

[0103] It is worth noting that for the case of reaching the set temperature and shutting down or malfunctioning and shutting down, in the process of the unit shutting down, the embodiments of the present application need to calculate the current required frequency of the compressor at the moment of resuming starting according to the actual outlet water temperature and the target water temperature. Until the unit resumes starting due to available demand, the current required frequency calculated according to the moment when the unit resumes starting due to available demand and the initial frequency calculated according to the available demand are jointly used to determine the target frequency for the compressor to start and operate, avoiding too large starting frequency resulting in frequent start and stop of the unit, which is beneficial to improving the temperature control accuracy of the unit and reducing energy consumption.

[0104] In an embodiment, for the above step S220, it can be repeated every preset time interval. Specifically, every preset time interval, the actual outlet water temperature is obtained, and the current required frequency of the compressor is determined according to the actual outlet water temperature and the target water temperature.

[0105] Specifically, as time goes by, the actual outlet water temperature often changes accordingly. Therefore, in order to update and calculate the current required frequency of the compressor at the moment of resuming starting in a timely and accurate manner, the embodiments of the present application need to recalculate the current required frequency every once in a while.

[0106] It can be understood that the above preset time interval can be 5 minutes, or 8 minutes, or other time intervals. The embodiments of the present application do not specifically limit the value of the preset time interval.

[0107] In addition, as Figure 3 shown, Figure 3It is a flowchart of the frequency control method of the compressor provided by another embodiment of the present application; for the actual water outlet temperature, it includes the current actual water outlet temperature in the current cycle and the historical actual water outlet temperature in the historical cycle; in this regard, regarding determining the current required frequency of the compressor according to the actual water outlet temperature and the target water temperature in step S220 above, it may include but is not limited to step S310, step S320, and step S330.

[0108] Step S310: Determine the temperature difference between the current actual water outlet temperature and the target water temperature;

[0109] Step S320: Determine the change difference between the current actual water outlet temperature and the historical actual water outlet temperature;

[0110] Step S330: Determine the current required frequency of the compressor according to the temperature difference and the change difference.

[0111] In one embodiment, in the process of calculating the current required frequency of the compressor at the moment of calculating the restart energy requirement, the embodiment of the present application needs to first calculate the temperature difference between the current actual water outlet temperature in the current cycle and the target water temperature, and also needs to calculate the difference between the current actual water outlet temperature in the current cycle and the historical actual water outlet temperature in the historical cycle, that is, the change difference of the water outlet temperature; then, the embodiment of the present application will jointly determine the current required frequency of the compressor based on the temperature difference and the change difference.

[0112] It should be noted that for the temperature difference between the current actual water outlet temperature and the target water temperature, it can reflect the size of the gap between the water outlet temperature and the temperature expected by the user; in addition, for the change difference between the current actual water outlet temperature and the historical actual water outlet temperature, it can reflect the speed of the temperature change of the water outlet temperature; in this regard, based on the above temperature gap size and temperature change speed, the current required frequency of the compressor can be calculated better.

[0113] It should be noted that regarding the above historical cycle, it can refer to the previous cycle, or it can refer to the previous two cycles, or others, and the embodiment of the present application does not make specific limitations on this.

[0114] In addition, as Figure 4 shown, Figure 4 It is a flowchart of the frequency control method of the compressor provided by another embodiment of the present application; regarding determining the current required frequency of the compressor according to the temperature difference and the change difference in step S330 above, it may include but is not limited to step S410, step S420, and step S430.

[0115] Step S410: Obtain the historical required frequency in the historical cycle;

[0116] Step S420: Determine the first frequency correction value according to the temperature difference and the change difference;

[0117] Step S430: Determine the current required frequency of the compressor according to the historical required frequency, the first frequency correction value, and the second frequency correction value, where the second frequency correction value is determined according to the model of the heat pump chiller.

[0118] In one embodiment, since the temperature difference between the current actual water outlet temperature and the target water temperature can reflect the magnitude of the gap between the water outlet temperature and the temperature expected by the user, and in addition, the change difference between the current actual water outlet temperature and the historical actual water outlet temperature can reflect the speed of the temperature change of the water outlet temperature; therefore, the embodiment of the present application can calculate the first frequency correction value based on the temperature difference and the change difference. In addition, the model of the heat pump chiller can affect the overall heating or cooling effect. Therefore, the embodiment of the present application can also calculate the second frequency correction value based on the model of the heat pump chiller.

[0119] Next, after obtaining the first frequency correction value and the second frequency correction value, the embodiment of the present application also needs to obtain the historical required frequency of the historical period, and jointly correct it based on the first frequency correction value and the second frequency correction value on the basis of the historical required frequency, so as to obtain the current required frequency of the compressor in the current period.

[0120] In addition, as Figure 5 shown, Figure 5 is a flowchart of a frequency control method for a compressor provided by another embodiment of the present application; regarding the determination of the current required frequency of the compressor according to the historical required frequency, the first frequency correction value, and the second frequency correction value in the above step S430, it may include but is not limited to step S510 and step S520.

[0121] Step S510: Input the historical required frequency, the first frequency correction value, and the second frequency correction value into the first frequency calculation model;

[0122] Step S520: Obtain the current required frequency of the compressor; where the first frequency calculation model includes a first input variable, a second input variable, and a third input variable. The first input variable is used to be assigned the historical required frequency, the second input variable is used to be assigned the first frequency correction value, the third input variable is used to be assigned the second frequency correction value, and the sum of the product of the second input variable and the third input variable and the first input variable is the current required frequency.

[0123] In one embodiment, the present application embodiment can calculate the current required frequency of the compressor through the following formula: Fstop = Fstop(n - 1) + K1 × ΔFi × K2, where Fstop is the current required frequency of the compressor, Fstop(n - 1) is the historical required frequency of the compressor calculated in the previous cycle, ΔFi is the first frequency correction value, which can be designed and valued according to the temperature difference E_TW and the change difference △E_TW1 during the experiment, K1 × K2 is the second frequency correction value, and K1 and K2 can be determined through experiments and calculations according to the specific model.

[0124] In addition, as Figure 6 shown, Figure 6 is a flowchart of the frequency control method of the compressor provided by another embodiment of the present application; the frequency control method of the present application embodiment may further include but is not limited to step S610, step S620, and step S630.

[0125] Step S610: Obtain the total energy demand parameter when the shutdown type is manual shutdown or the unit shuts down due to mode switching.

[0126] Step S620: Determine the initial frequency of the compressor according to the total energy demand parameter.

[0127] Step S630: Determine the target frequency of the compressor according to the initial frequency, and control the compressor to start at the target frequency.

[0128] In one embodiment, when the heat pump cold and hot water unit shuts down, the present application embodiment will detect the shutdown type of the heat pump cold and hot water unit. If it is detected that the shutdown type is manual shutdown or the unit shuts down due to mode switching, when the heat pump cold and hot water unit has energy demand and resumes startup, the present application embodiment will calculate the initial frequency of the compressor based on the total energy demand parameter; finally, the present application embodiment will jointly determine the target frequency for the compressor to start and run based on this initial frequency.

[0129] It should be noted that for the above-mentioned manual shutdown situation, it can be the situation where the user controls the shutdown through the remote control, or the situation where the user controls the shutdown through the mobile phone, or other control shutdown situations. The present application embodiment does not make specific limitations on this.

[0130] In addition, it should be noted that for the above-mentioned unit shutdown due to mode switching, it can refer to the situation where the unit needs to shut down under mode switching, where the mode switching can refer to the unit switching from cooling operation to heating operation or from heating operation to cooling operation.

[0131] Among them, it should be noted that regarding the total energy demand parameters of all the above indoor heat exchange devices, specifically, it can refer to the total energy demand parameters of the actually connected and powered-on indoor heat exchange devices, without including the unpowered indoor heat exchange devices in the calculation.

[0132] In addition, as Figure 7 shown, Figure 7 is a flowchart of a compressor frequency control method provided by another embodiment of the present application; regarding determining the initial frequency of the compressor according to the total energy demand parameter in the above step S230 and step S620, it may include but is not limited to step S710, step S720, and step S730.

[0133] Step S710, obtain the outdoor ambient temperature and / or the model capacity;

[0134] Step S720, determine the target correction coefficient according to the outdoor ambient temperature and / or the model capacity;

[0135] Step S730, determine the initial frequency of the compressor according to the target correction coefficient and the total energy demand parameter.

[0136] In one embodiment, since the level of the outdoor ambient temperature and the size of the model capacity will affect the heating or cooling capacity of the system, therefore, the embodiments of the present application will also calculate the target correction coefficient based on the outdoor ambient temperature and / or the model capacity, and use this target correction coefficient to correct the initial operating frequency of the compressor.

[0137] In addition, in one embodiment, the embodiments of the present application can also calculate the target correction coefficient based on the outdoor ambient temperature alone, and use this target correction coefficient to correct the initial operating frequency of the compressor; or, the target correction coefficient can also be calculated based on the model capacity alone, and use this target correction coefficient to correct the initial operating frequency of the compressor.

[0138] In one embodiment, regarding the above-mentioned target correction coefficient, it may include at least one of a third frequency correction value and a fourth frequency correction value, where the third frequency correction value is determined based on the outdoor ambient temperature or the model capacity, and the fourth frequency correction value is determined based on the outdoor ambient temperature.

[0139] In addition, as Figure 8 shown, Figure 8 is a flowchart of a compressor frequency control method provided by another embodiment of the present application; regarding determining the initial frequency of the compressor according to the target correction coefficient and the total energy demand parameter in the above step S730, it may include but is not limited to step S810 and step S820.

[0140] Step S810, input the third frequency correction value, the fourth frequency correction value, and the total energy demand parameter into the second frequency calculation model;

[0141] Step S820: Obtain the initial frequency of the compressor. Among them, the second frequency calculation model includes a fourth input variable, a fifth input variable, and a sixth input variable. The fourth input variable is used to be assigned the third frequency correction value, the fifth input variable is used to be assigned the total energy demand parameter, and the sixth input variable is used to be assigned the fourth frequency correction value. The sum of the product of the fourth input variable and the fifth input variable and the sixth input variable is the initial frequency.

[0142] In one embodiment, the initial frequency of the compressor can be calculated by the following formula in the embodiment of the present application: FQwn = i * Qwn + j, where FQwn is the initial frequency of the compressor, i is the third frequency correction value, Qwn is the total energy demand parameter, and j is the fourth frequency correction value.

[0143] It should be noted that in addition to correcting the initial frequency of the compressor simultaneously through the two coefficients of the third frequency correction value and the fourth frequency correction value, the initial frequency of the compressor can also be corrected based on only one of the frequency correction values. For example, when i is 1, the initial frequency of the compressor is corrected only based on j.

[0144] In addition, as Figure 9 shown, Figure 9 is a flowchart of a frequency control method for a compressor provided by another embodiment of the present application; regarding determining the target frequency of the compressor according to the current demand frequency and the initial frequency in the above step S240, it may include at least one of steps S910, S920, S930, and S940.

[0145] Step S910: When the current demand frequency of the compressor is greater than zero and the minimum value of the current demand frequency and the initial frequency is less than the preset minimum allowable operating frequency, take the minimum allowable operating frequency as the target frequency of the compressor;

[0146] Step S920: When the current demand frequency of the compressor is greater than zero and the minimum value of the current demand frequency and the initial frequency is greater than the preset maximum allowable operating frequency, take the maximum allowable operating frequency as the target frequency of the compressor;

[0147] Step S930: When the current demand frequency of the compressor is greater than zero and the minimum value of the current demand frequency and the initial frequency is greater than or equal to the minimum allowable operating frequency and less than or equal to the maximum allowable operating frequency, take the minimum value of the current demand frequency and the initial frequency as the target frequency of the compressor;

[0148] Step S940: When the current required frequency of the compressor is less than or equal to zero, recalculate the current required frequency until the current required frequency is greater than zero, and then determine the target frequency of the compressor based on the current required frequency and the initial frequency.

[0149] In one embodiment, the rule for determining the target frequency of the compressor based on the current required frequency and the initial frequency is as follows:

[0150] If the current required frequency of the compressor is greater than zero, at this time, the minimum value of the current required frequency and the initial frequency is obtained. If the minimum value of the two is less than the preset minimum allowable operating frequency, since the compressor cannot operate at a frequency lower than the minimum allowable operating frequency, therefore, the compressor will start and operate at the minimum allowable operating frequency.

[0151] In addition, if the current required frequency of the compressor is greater than zero, and the minimum value of the two is greater than the preset maximum allowable operating frequency, since the compressor cannot operate at a frequency higher than the maximum allowable operating frequency, therefore, the compressor will start and operate at the maximum allowable operating frequency.

[0152] In addition, if the current required frequency of the compressor is greater than zero, and the minimum value of the two is between the minimum allowable operating frequency and the maximum allowable operating frequency, at this time, in order to reduce the phenomenon of frequent start and stop caused by too high a frequency of the compressor, the embodiment of the present application will use the minimum value of the two as the target frequency of the compressor.

[0153] In addition, if the current required frequency of the compressor is less than or equal to zero, the calculation of the target frequency is stopped, and the current required frequency of the compressor is recalculated until the current required frequency of the compressor is greater than zero, and then the target frequency of the compressor is calculated according to the above rules.

[0154] In addition, as Figure 10 shown, Figure 10 is a flowchart of a frequency control method for a compressor provided by another embodiment of the present application; regarding determining the target frequency of the compressor based on the initial frequency in the above step S630, it may include at least one of steps S1010, S1020, and S1030.

[0155] Step S1010: When the initial frequency is less than the preset minimum allowable operating frequency, use the minimum allowable operating frequency as the target frequency of the compressor;

[0156] Step S1020: When the initial frequency is greater than the preset maximum allowable operating frequency, use the maximum allowable operating frequency as the target frequency of the compressor;

[0157] Step S1030: When the initial frequency is greater than or equal to the minimum allowable operating frequency and less than or equal to the maximum allowable operating frequency, the initial frequency is used as the target frequency of the compressor.

[0158] In one embodiment, the rule for determining the target frequency of the compressor according to the initial frequency is as follows:

[0159] If the initial frequency of the compressor is less than the preset minimum allowable operating frequency, since the compressor cannot operate at a frequency lower than the minimum allowable operating frequency, the compressor will start and operate at the minimum allowable operating frequency.

[0160] In addition, if the initial frequency of the compressor is greater than the preset maximum allowable operating frequency, since the compressor cannot operate at a frequency higher than the maximum allowable operating frequency, the compressor will start and operate at the maximum allowable operating frequency.

[0161] In addition, if the initial frequency of the compressor is between the minimum allowable operating frequency and the maximum allowable operating frequency, in this case, the embodiment of the present application will use the initial frequency as the target frequency of the compressor.

[0162] Based on the frequency control methods of the compressors in the above various embodiments, the overall embodiments of the frequency control method of the compressor of the present application are respectively proposed below.

[0163] As Figure 11 shown, Figure 11 is the overall flowchart of the frequency control method of the compressor provided by an embodiment of the present application; the overall process includes but is not limited to the following steps:

[0164] Step S1110: The unit shuts down;

[0165] Step S1120: Determine the compressor start target frequency control for the unit to resume energy demand according to the temperature-reached shutdown type;

[0166] Step S1131: The shutdown type is manual shutdown or mode switching;

[0167] Step S1132: The unit needs to restart to resume energy demand;

[0168] Step S1133: Calculate the initial frequency FQwn according to the energy demand;

[0169] Step S1134: The compressor start target frequency Fb = FQwn;

[0170] Step S1141: The shutdown type is temperature-reached protection shutdown or fault protection shutdown;

[0171] Step S1142: Calculate the required frequency Fstop of the compressor during the shutdown process based on the difference E_TW between the actual outlet water temperature and the target water temperature and the change difference △E_TW1 of the actual outlet water temperature.

[0172] Step S1143: Restart the unit when the energy demand resumes.

[0173] Step S1144: Calculate the initial frequency FQwn according to the energy demand.

[0174] Step S1145: The compressor startup target frequency Fb is jointly determined by Fstop and FQwn.

[0175] In an embodiment, if the shutdown type is temperature - reached shutdown or fault - protection shutdown, during the unit shutdown process, it is necessary to calculate the target frequency Fstop of the compressor according to the water temperature change. When the unit restarts, the operating target frequency Fb of the compressor during restart is jointly determined by the required frequency Fstop and the initial frequency FQwn.

[0176] If the shutdown type is manual shutdown or mode - switching unit shutdown, during the unit shutdown process, there is no need to calculate the required frequency Fstop. When the unit restarts, only the initial frequency FQwn is required to determine the operating target frequency Fb of the compressor during restart.

[0177] Among them, when the unit stops running, if the shutdown type is temperature - reached shutdown or fault - protection shutdown, then at regular intervals, obtain the frequency correction value △Fi during the shutdown process according to the interval where the difference E_TW between the actual outlet water temperature and the target water temperature and the change difference △E_TW1 of the actual outlet water temperature are located. Calculate the required frequency Fstop of the compressor at the moment when the restart energy demand is met as Fstop = Fstop(n - 1)+K1×△Fi×K2, where Fstop(n - 1) is the required frequency of the compressor calculated in the previous cycle, △Fi is the value designed according to the magnitudes of E_TW and △E_TW1 during the experiment, and K1 and K2 are determined through experiments and calculations according to the specific model.

[0178] In addition, when the unit has energy demand and resumes startup, first calculate the initial frequency FQwn = i*Qwn + j according to the energy demand and the outdoor ambient temperature, where Qwn is the total energy demand, i and j are correction coefficients, i is a preset value determined according to the ambient temperature or the model capacity, and j is a preset value determined according to the ambient temperature and is determined through experiments.

[0179] In addition, if the shutdown type is manual shutdown or mode switching, where mode switching means the unit switches from cooling operation to heating operation or from heating operation to cooling operation, then when the unit resumes startup, if FQwn < the minimum allowable frequency Fmin for compressor operation, the target frequency Fb for compressor startup operation is Fmin; if FQwn > the maximum allowable frequency Fmax for compressor operation, the target frequency Fb for compressor startup operation is Fmax; otherwise, the target frequency Fb for compressor startup operation is FQwn.

[0180] In addition, if the shutdown type is temperature - reached shutdown or fault shutdown, where temperature - reached shutdown means the compressor shuts down when the actual water outlet temperature reaches the target water temperature, and fault shutdown means the compressor shuts down due to a fault in the unit, then when the unit resumes startup, if Fstop > 0, if min(FQwn, Fstop) < the minimum allowable frequency Fmin for compressor operation, the target frequency Fb for compressor startup operation is Fmin; if min(FQwn, Fstop) > the maximum allowable frequency Fmax for compressor operation, the target frequency Fb for compressor startup operation is Fmax; otherwise, the target frequency Fb for compressor startup operation is min(FQwn, Fstop). If Fstop ≤ 0, the compressor is not allowed to start, and Fstop continues to be calculated.

[0181] Based on the compressor frequency control methods of the above - mentioned various embodiments, the embodiments of the present application have the following technical effects:

[0182] The embodiments of the present application can achieve corresponding target frequencies for compressor startup operation when the unit resumes startup according to different shutdown types of the unit: if it is manual shutdown or mode - switching shutdown, the startup operation frequency of the compressor is determined according to the energy demand calculation frequency when resuming startup; if the shutdown type is temperature - reached shutdown or fault shutdown, then during the shutdown process of the unit, it is necessary to calculate the demand frequency of the compressor at the moment of resuming startup according to the changes in the target water temperature and the actual water temperature. Until the unit resumes startup with energy demand, the target frequency for compressor startup operation is jointly determined by the demand frequency of the compressor calculated at the moment of resuming startup of the unit and the initial frequency calculated according to the energy demand, avoiding frequent start - stops of the unit caused by too large startup frequencies, which is beneficial to improving the temperature control accuracy of the unit and reducing energy consumption.

[0183] Based on the compressor frequency control methods of the above - mentioned various embodiments, the following are the respective embodiments of the controller, outdoor unit, heat pump chiller, and computer - readable storage medium of the present application.

[0184] As Figure 12 shown, Figure 12It is a schematic structural diagram of a controller for implementing a frequency control method of a compressor provided by an embodiment of the present application. The controller 300 implemented in the present application includes: a processor 310, a memory 320, and a computer program stored on the memory 320 and executable on the processor 310. Among them, Figure 12 One processor 310 and one memory 320 are taken as examples.

[0185] The processor 310 and the memory 320 can be connected through a bus or other means, Figure 12 Taking the connection through the bus as an example.

[0186] The memory 320, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. In addition, the memory 320 may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, a flash memory device, or other non-transitory solid-state storage devices. In some embodiments, the memory 320 may optionally include a memory 320 remotely set relative to the processor 310, and these remote memories 320 can be connected to the controller 300 through a network. Examples of the above-mentioned network include but are not limited to the Internet, an enterprise intranet, a local area network, a mobile communication network, and combinations thereof.

[0187] Those skilled in the art can understand that, Figure 12 the device structure shown in the figure does not constitute a limitation on the controller 300, and may include more or fewer components than shown in the figure, or combine certain components, or have different component arrangements.

[0188] In Figure 12 the shown controller 300, the processor 310 can be used to call the control program stored in the memory 320, so as to implement the above-mentioned frequency control method of the compressor. Specifically, the non-transitory software program and instructions required to implement the frequency control method of the compressor in the above embodiment are stored in the memory 320, and when executed by the processor 310, the frequency control method of the compressor in the above embodiment is executed.

[0189] It should be noted that since the controller 300 in the embodiment of the present application can execute the frequency control method of the compressor in any of the above embodiments, therefore, the specific implementation manners and technical effects of the controller 300 in the embodiment of the present application can refer to the specific implementation manners and technical effects of the frequency control method of the compressor in any of the above embodiments.

[0190] In addition, an embodiment of the present application further provides an outdoor unit, and the outdoor unit includes the controller in the above embodiment.

[0191] It should be noted that since the outdoor unit of the embodiment of the present application includes the controller of the above embodiment, and the controller of the above embodiment can execute the frequency control method of the compressor in any of the above embodiments, therefore, the specific implementation manners and technical effects of the outdoor unit of the embodiment of the present application can refer to the specific implementation manners and technical effects of the frequency control method of the compressor in any of the above embodiments.

[0192] In addition, an embodiment of the present application further provides a heat pump chiller-heater unit, which includes the outdoor unit or the controller of the above embodiment.

[0193] It should be noted that since the heat pump chiller-heater unit of the embodiment of the present application includes the outdoor unit or the controller of the above embodiment, the outdoor unit of the above embodiment includes the controller of the above embodiment, and the controller of the above embodiment can execute the frequency control method of the compressor in any of the above embodiments, therefore, the specific implementation manners and technical effects of the heat pump chiller-heater unit of the embodiment of the present application can refer to the specific implementation manners and technical effects of the frequency control method of the compressor in any of the above embodiments.

[0194] In addition, an embodiment of the present application further provides a computer-readable storage medium, which stores computer-executable instructions for executing the above-mentioned frequency control method of the compressor. Exemplarily, execute the method steps described above Figures 2 to 11 in the above.

[0195] It should be noted that since the computer-readable storage medium of the embodiment of the present application can execute the frequency control method of the compressor in any of the above embodiments, therefore, the specific implementation manners and technical effects of the computer-readable storage medium of the embodiment of the present application can refer to the specific implementation manners and technical effects of the frequency control method of the compressor in any of the above embodiments.

[0196] Those of ordinary skill in the art will understand that all or some of the steps and systems disclosed in the above methods can be implemented as software, firmware, hardware, and their appropriate combinations. Some physical components or all physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include a computer storage medium (or non-transitory medium) and a communication medium (or transitory medium). As is well known to those of ordinary skill in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information, such as computer-readable instructions, data structures, program modules, or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cassettes, tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, as is well known to those of ordinary skill in the art, communication media typically includes computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transmission mechanism, and can include any information delivery medium.

[0197] The above is a specific description of the preferred embodiments of the present application. However, the present application is not limited to the above embodiments. Those skilled in the art can also make various equivalent deformations or substitutions without departing from the spirit of the present application. These equivalent deformations or substitutions are all included within the scope defined by the claims of the present application.

Claims

1. A frequency control method for a compressor, characterized in that, it includes: Obtain the shutdown type of the heat pump cold and hot water unit; In the case where the shutdown type is temperature-reached shutdown or fault shutdown, obtain the actual outlet water temperature and the target water temperature, and determine the current required frequency of the compressor according to the actual outlet water temperature and the target water temperature; When the heat pump cold and hot water unit can resume startup due to energy demand, obtain the total energy demand parameter, and determine the initial frequency of the compressor according to the total energy demand parameter; Determine the target frequency of the compressor according to the current required frequency and the initial frequency, and control the compressor to start at the target frequency.

2. The frequency control method according to claim 1, characterized in that, The step of determining the current required frequency of the compressor according to the actual outlet water temperature and the target water temperature includes: Every preset time interval, determine the current required frequency of the compressor according to the actual outlet water temperature and the target water temperature.

3. The frequency control method according to claim 2, characterized in that, The actual outlet water temperature includes the current actual outlet water temperature of the current cycle and the historical actual outlet water temperature of the historical cycle; the step of determining the current required frequency of the compressor according to the actual outlet water temperature and the target water temperature includes: Determine the temperature difference between the current actual outlet water temperature and the target water temperature; Determine the change difference between the current actual outlet water temperature and the historical actual outlet water temperature; Determine the current required frequency of the compressor according to the temperature difference and the change difference.

4. The frequency control method according to claim 3, characterized in that, The step of determining the current required frequency of the compressor according to the temperature difference and the change difference includes: Obtain the historical required frequency of the historical cycle; Determine the first frequency correction value according to the temperature difference and the change difference; Determine the current required frequency of the compressor according to the historical required frequency, the first frequency correction value and the second frequency correction value, wherein the second frequency correction value is determined by the model of the heat pump cold and hot water unit.

5. The frequency control method according to claim 4, characterized in that, The step of determining the current required frequency of the compressor according to the historical required frequency, the first frequency correction value and the second frequency correction value includes: Input the historical required frequency, the first frequency correction value and the second frequency correction value into the first frequency calculation model to obtain the current required frequency of the compressor; Wherein, the first frequency calculation model includes a first input variable, a second input variable and a third input variable. The first input variable is used to be assigned the historical required frequency, the second input variable is used to be assigned the first frequency correction value, the third input variable is used to be assigned the second frequency correction value, and the sum of the product of the second input variable and the third input variable and the first input variable is the current required frequency.

6. The frequency control method according to claim 1, characterized in that, The frequency control method further includes: When the shutdown type is manual shutdown or shutdown of the unit during mode switching, obtain the total energy demand parameters; Determine the initial frequency of the compressor according to the total energy demand parameters; Determine the target frequency of the compressor according to the initial frequency, and control the compressor to start at the target frequency.

7. The frequency control method according to claim 1 or 6, characterized in that, The determining the initial frequency of the compressor according to the total energy demand parameters includes: Obtain the outdoor ambient temperature and / or the model capacity, and determine the target correction coefficient according to the outdoor ambient temperature and / or the model capacity; Determine the initial frequency of the compressor according to the target correction coefficient and the total energy demand parameters.

8. The frequency control method according to claim 7, characterized in that, The target correction coefficient includes a third frequency correction value and a fourth frequency correction value. The third frequency correction value is determined based on the outdoor ambient temperature or the model capacity, and the fourth frequency correction value is determined based on the outdoor ambient temperature; The determining the initial frequency of the compressor according to the target correction coefficient and the total energy demand parameters includes: Input the third frequency correction value, the fourth frequency correction value and the total energy demand parameters into a second frequency calculation model to obtain the initial frequency of the compressor; Wherein, the second frequency calculation model includes a fourth input variable, a fifth input variable and a sixth input variable. The fourth input variable is used to be assigned the third frequency correction value, the fifth input variable is used to be assigned the total energy demand parameters, and the sixth input variable is used to be assigned the fourth frequency correction value. The sum of the product of the fourth input variable and the fifth input variable and the sixth input variable is the initial frequency.

9. The frequency control method according to claim 1, characterized in that, The determining the target frequency of the compressor according to the current demand frequency and the initial frequency includes one of the following: When the current demand frequency is greater than zero and the minimum value of the current demand frequency and the initial frequency is less than a preset minimum allowable operating frequency, use the minimum allowable operating frequency as the target frequency of the compressor; When the current demand frequency is greater than zero and the minimum value of the current demand frequency and the initial frequency is greater than a preset maximum allowable operating frequency, use the maximum allowable operating frequency as the target frequency of the compressor; When the current demand frequency is greater than zero and the minimum value of the current demand frequency and the initial frequency is greater than or equal to the minimum allowable operating frequency and less than or equal to the maximum allowable operating frequency, use the minimum value of the current demand frequency and the initial frequency as the target frequency of the compressor; When the current demand frequency is less than or equal to zero, recalculate the current demand frequency until the current demand frequency is greater than zero, and then determine the target frequency of the compressor according to the current demand frequency and the initial frequency.

10. The frequency control method according to claim 6, characterized in that, Determining the target frequency of the compressor according to the initial frequency includes one of the following: When the initial frequency is less than the preset minimum allowable operating frequency, the minimum allowable operating frequency is used as the target frequency of the compressor; When the initial frequency is greater than the preset maximum allowable operating frequency, the maximum allowable operating frequency is used as the target frequency of the compressor; When the initial frequency is greater than or equal to the minimum allowable operating frequency and less than or equal to the maximum allowable operating frequency, the initial frequency is used as the target frequency of the compressor.

11. A controller, Characterized in that, It includes: A memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor runs the computer program, it executes the frequency control method of the compressor according to any one of claims 1 to 10.

12. A heat pump chiller, Characterized in that, It includes the controller according to claim 11.

13. A computer-readable storage medium, Characterized in that: It stores computer-executable instructions for executing the frequency control method of the compressor according to any one of claims 1 to 10.

Images