A control method and device for heat pump compressor and air source heat pump

Abstract

The present invention discloses a control method and device for a heat pump compressor and an air source heat pump. The control method includes the following steps: step S1, the heat pump unit is started and operated, and the controller collects the operating parameters of the heat pump unit; step S2, the compressor automatically operates and adjusts according to the PID; step S3, when the first ambient temperature range is met, high-pressure prediction correction is performed in real time and the compressor frequency reduction control is performed; step S4, when the second ambient temperature range is met, the compressor load correction and heating capacity frequency control correction parameters are performed; step S5, when the third ambient temperature range is met, the compressor load correction and heating capacity frequency control correction parameters are performed; the heat pump parameters are comprehensively analyzed through system parameters, and the system pressure range and heat pump heating conditions are estimated, so as to timely adjust the compressor operation status.

Description

Technical Field

[0001] The present invention relates to air source heat pump control technology, and in particular to a control method and device for a heat pump compressor and an air source heat pump. Background Art

[0002] The air source heat pump compresses the low-pressure refrigerant into high-pressure gas through a compressor, which then enters the condenser for liquefaction. The absorbed heat is transferred to the circulating water through a heat exchanger, thereby increasing the water temperature and providing a continuous heat source for indoor heating until the indoor temperature reaches the set temperature.

[0003] To improve heat pump efficiency, existing air-source heat pumps are designed and manufactured using components specifically developed to match the system. However, existing heat pump units typically operate under varying loads. Once the load changes, the actual operating conditions also change accordingly, causing the unit's actual efficiency to differ significantly from the rated design conditions. Therefore, heat pumps typically adjust the output load during operation by using variable-frequency compressors or by intermittently starting and stopping the compressor's working cylinders. These methods significantly impact operating efficiency and system stability. Furthermore, disturbances, measurement noise, and uncertainty can interfere with the controller, making it difficult to achieve good control quality with existing control models.

[0004] Therefore, existing heat pump systems are usually equipped with pressure sensors to detect system pressure, and when the system pressure is high, the compressor frequency is promptly reduced to unload and avoid excessive operating pressure of the compressor. However, when the sensor terminal is loose or the body fails, or when the cost control does not configure the pressure protection component, it will inevitably have an uncontrollable impact on the operating efficiency and stability of the system. In severe cases, when the air source heat pump is operated in certain specific situations, the operating pressure of the heat pump system will be too high due to reasons such as excessive refrigerant charge in the unit, high compressor frequency operation, and high water temperature during heat pump operation, which will cause the compressor protection or damage; affecting the reliability of the compressor operation and causing users to have a poor heating experience. Summary of the Invention

[0005] The present invention provides a control method and device for a heat pump compressor and an air source heat pump. When the air source heat pump cannot collect the pressure of the heat pump system, the heat pump parameters are comprehensively analyzed through system parameters, and the system pressure range and the heating capacity of the heat pump are estimated. The operating state of the compressor is timely adjusted, taking into account the heating capacity of the heat pump and the high-reliability operation of the system, thereby improving the operating reliability of the compressor and ensuring the reliability of user use.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] A method for controlling a heat pump compressor, characterized in that the heat pump system includes a first heat exchanger disposed outdoors, a second heat exchanger using a water pump unit for water cooling and heat exchange, a compressor, a third heat exchanger for replenishing air to the compressor, a first electronic expansion valve disposed between the first heat exchanger and the third heat exchanger, and a second electronic expansion valve disposed between the third heat exchanger and the second heat exchanger, wherein the compressor is connected between the first heat exchanger and the second heat exchanger via a refrigerant pipeline and a four-way valve; the method for controlling the heat pump compressor includes the following steps:

[0008] Step S1: The heat pump unit starts running.

[0009] The heat pump unit starts heating or hot water mode and then starts running. The controller collects the operating parameters of the heat pump unit.

[0010] The parameters collected by the controller include the heat pump operating environment temperature T h , heat exchanger inlet water temperature T in , heat exchanger outlet water temperature T ou , heat exchanger refrigerant liquid pipe temperature T ly and compressor operating current value P c， The heat exchanger inlet water temperature T in , the heat exchanger outlet water temperature T ou and the heat exchanger refrigerant liquid pipe temperature T ly These are the operating parameters corresponding to the second heat exchanger;

[0011] Step S2: The compressor automatically operates and adjusts according to PID.

[0012] After the heat pump unit starts running for a period of time, the controller begins to comprehensively judge the compressor frequency control temperature value T k , compressor frequency control current value P c The changes in the refrigerant liquid pipe temperature are determined and tested as follows, and the compressor is operated under the following conditions;

[0013] Step S2.1, when T k <T m , or T ly -T in ≥H y And dT ly / dt <G m , or T k <T m And P c <P m , or P c <P m And T ly -T in ≥H y And dTly / dt <G m , or T k <T m And P c <P m And T ly -T in ≥H y And dT ly / dt <G m When the compressor is running, the frequency of the compressor will automatically increase or decrease according to the fuzzy control parameters, and will not be affected by the correction of the heating capacity of the heat pump unit;

[0014] Step S2.2, when T m ≤T k <T x , or T ly -T in ≥H y And G m ≤dT ly / dt <G x , or T m ≤T k <T x And P m ≤P c <P x , or P m ≤P c <P x And T ly -T in ≥H y And G m ≤dT ly / dt <G x , or T m ≤T k <T x And P m ≤P c <P x And T ly -T in ≥H y And G m ≤dT ly / dt <G x When the compressor is in the deceleration and frequency increase control mode, the compressor can increase the frequency by M frequency at most each time, and the operation time is t x After a certain time, the heat pump unit is tested again as a deceleration and frequency increase condition, and the compressor frequency is increased to a maximum of M frequency each time;

[0015] Step S2.3, when T x ≤T k <T j , or T ly -T in ≥H yAnd G x ≤dT ly / dt <G j , or T x ≤T k <T j And P x ≤P c <P j , or P x ≤P c <P j And T ly -T in ≥H y And G x ≤dT ly / dt <G j , or T x ≤T k <T j And P x ≤P c <P j And T ly -T in ≥H y And G x ≤dT ly / dt <G j When the compressor is running at a certain frequency, the frequency of the compressor is limited.

[0016] Step S2.4, when T j ≤T k <T t , or T ly -T in ≥H y And G j ≤dT ly / dt <G t , or T j ≤T k <T t And P j ≤P c <P t , or P j ≤P c <P t And T ly -T in ≥H y And G j ≤dT ly / dt <G t , or T j ≤T k <T t And P j ≤P c <P t And T ly-T in ≥H y And G j ≤dT ly / dt <G t When the compressor frequency is reduced to N, t y After time, test again, if T k If the frequency control temperature value still meets the conditions of this interval, the frequency reduction conditions of the heat pump unit will be tested again;

[0017] Step S2.5, when T k ≥T t , or T ly -T in ≥H y And dT ly / dt≥G t , or T k ≥T t And P c ≥P t , or P c ≥P t And T ly -T in ≥H y And dT ly / dt≥G t , or T k ≥T t And P c ≥P t And T ly -T in ≥H y And dT ly / dt≥G t When the compressor stops running directly;

[0018] Where: T k =T ou , T k Indicates the frequency control temperature value of the compressor frequency collected in real time; when the high pressure sensor is not configured, the outlet water temperature T ou As an approximate alternative value for high-pressure temperature frequency control; or the outlet water temperature T of the second heat exchanger ou Using T ly Instead, use T ly When replacing, the corresponding parameter values need to be reassigned;

[0019] in:

[0020] T m Indicates the budgeted high-pressure temperature value for the slow frequency increase of the compressor after correction based on the capacity of the heat pump unit;

[0021] T xIndicates the budgeted high-pressure temperature value for limiting the frequency increase of the compressor after correction based on the capacity of the heat pump unit;

[0022] T j Indicates the budgeted high-pressure temperature value for compressor frequency reduction after correction based on the heat pump unit capacity;

[0023] T t Indicates the budgeted high-pressure temperature value for stopping the compressor after correction based on the capacity of the heat pump unit;

[0024] M indicates that the compressor is subjected to T m Frequency of influence and limitation;

[0025] t x Indicates that the compressor is subjected to T m Frequency operation time limited by influence;

[0026] N indicates that the compressor is subjected to T j The frequency of the reduction due to the influence;

[0027] t y Indicates compressor T j The frequency running time is reduced due to the impact;

[0028] H y Indicates the preset value of the refrigerant liquid pipe temperature involved in compressor frequency control;

[0029] dT ly / dt represents the rate of change of the refrigerant liquid pipe temperature collected by the controller;

[0030] G m Indicates the preset value of the refrigerant liquid pipe temperature change rate that controls the slow frequency increase of the compressor;

[0031] G x Indicates the preset value of the refrigerant liquid pipe temperature change rate that controls the compressor to limit the frequency increase;

[0032] G j Indicates the preset value of the refrigerant liquid pipe temperature change rate for controlling the compressor frequency reduction;

[0033] G t Indicates the preset value of the refrigerant liquid pipe temperature change rate for controlling the compressor to stop;

[0034] P m Indicates the preset value of the compressor current that controls the slow frequency increase of the compressor;

[0035] P x Indicates the preset value of the compressor current that controls the compressor to limit the frequency increase;

[0036] P j Indicates the preset value of the compressor current for controlling the compressor frequency reduction;

[0037] P t Indicates the preset value of the compressor current for controlling the compressor to stop;

[0038] Step S3: When the first ambient temperature range is met, that is, when T h >T h1 hour:

[0039] Step S3.1, when the heat pump unit heats the water with a temperature difference of T ou -T in >Variable water temperature correction value T n When the pressure drops, correction is required; high pressure prediction correction is performed in real time, and compressor frequency reduction control is performed;

[0040] Calculate T m =T m0 +Ti,

[0041] Calculate T x =T x0 +Ti,

[0042] Calculate T j =T j0 +Ti,

[0043] Calculate T t =T t0 +Ti;

[0044] Step S3.2, when T ou -T in ≤T n When , there is no need to increase the correction value. At this time, the heat pump system has sufficient high-pressure margin, and the heat pump unit can run freely to provide sufficient heating;

[0045] Calculate T m =T m0 ,

[0046] Calculate T x =T x0 ,

[0047] Calculate T j =T j0 ,

[0048] Calculate T t =T t0 ;

[0049] Where: Calculate T n =T in ×K1+K2, ------Formula 1

[0050] T n represents the variable water temperature reference frequency control correction value calculated according to the proposed formula 1, which is related to the water temperature;

[0051] K1 represents the water temperature correction coefficient of the heat pump's heating capacity;

[0052] K2 represents the base value of the water temperature correction coefficient of the heat pump's heating capacity;

[0053] By inlet water temperature T in Determine the basic correction value; the higher the water temperature, the lower the correction base value, and it is easier to meet the correction conditions; the lower the water temperature, the higher the correction base value, and it is more difficult to meet the correction conditions. If the water temperature is too low, no correction is required;

[0054] Where: Calculate Ti = [S × (T ou -T in ) 2 +A×T n 2 +B×(T ou -T in )+C×T n +D×(T ou -T in )×T n +T0】------Formula 2

[0055] Ti represents the frequency control correction value related to the heat pump heating capacity calculated according to the proposed formula 2, which is associated with the heat pump operating capacity;

[0056] S represents the first frequency control correction coefficient;

[0057] A represents the second frequency control correction coefficient;

[0058] B represents the third frequency control correction coefficient;

[0059] C represents the fourth frequency control correction coefficient;

[0060] D represents the fifth frequency control correction coefficient;

[0061] The water flow through the second heat exchanger, the temperature difference between the outlet and inlet water of the second heat exchanger (T ou -T in ) calculates the approximate heating capacity of the heat pump unit; under the condition of constant ambient temperature and water temperature, when the water flow rate is fixed, the heating capacity of the heat pump unit is mainly determined by (T ou -T in ) determined; further correct the frequency control temperature value by formula 2; and realize that when the compressor frequency is limited or reduced, the heating capacity of the heat pump unit can meet the user's use needs as much as possible, avoiding the situation where the heat pump unit is insufficiently heated due to premature frequency reduction;

[0062] T m0 Indicates the preset value of high pressure temperature for slow frequency increase of the first compressor;

[0063] Tx0 Indicates the preset value of the high-pressure temperature for limiting the frequency increase of the first compressor;

[0064] T j0 Indicates the preset value of the high-pressure temperature of the first compressor during frequency reduction;

[0065] T t0 Indicates the preset value of the high pressure temperature of the first stopped compressor;

[0066] T h1 Indicates the first ambient temperature preset value;

[0067] Step S4: When the second ambient temperature range is met, that is, T h2 <T h ≤T h1 hour:

[0068] Step S4.1, when the heat pump heat exchange water temperature difference T ou -T in >Variable water temperature correction value T n When , it is necessary to make corrections to the compressor load and heating capacity frequency control;

[0069] Calculate T m =T m1 +Ti+K3T h ,

[0070] Calculate T x =T x1 +Ti+K3T h ,

[0071] Calculate T j =T j1 +Ti+K3T h ,

[0072] Calculate T t =T t1 +Ti+K3T h ;

[0073] Step S4.2, when T ou -T in ≤T n When , only the compressor load correction is required;

[0074] Calculate T m =T m1 +K3T h ,

[0075] Calculate T x =T x1 +K3T h ,

[0076] Calculate T j =Tj1 +K3T h ,

[0077] Calculate T t =T t1 +K3T h ;

[0078] in:

[0079] T m1 Indicates the preset value of high pressure temperature for slow frequency increase of the second compressor;

[0080] T x1 Indicates the preset value of the high-pressure temperature for limiting the frequency increase of the second compressor;

[0081] T j1 Indicates the preset value of the high-pressure temperature of the second compressor during frequency reduction;

[0082] T t1 Indicates the preset value of the high pressure temperature of the second stopped compressor;

[0083] T h2 Indicates the second ambient temperature preset value;

[0084] K3 represents the compressor load correction factor;

[0085] Step S5: When the third ambient temperature range is met, that is, when T h ≤T h2 hour:

[0086] Step S5.1, when the heat pump heat exchange water temperature difference T ou -T in >Variable water temperature correction value T n When , it is necessary to make corrections to the compressor load and heating capacity frequency control;

[0087] Calculate T m =T m2 +Ti+K4T h ,

[0088] Calculate T x =T x2 +Ti+K4T h ,

[0089] Calculate T j =T j2 +Ti+K4T h ,

[0090] Calculate T t =T t2 +Ti+K4T h ;

[0091] Step S5.2, when Tou -T in ≤T n When , only the compressor load correction parameters need to be performed;

[0092] Calculate T m =T m2 +K4T h ,

[0093] Calculate T x =T x2 +K4T h ,

[0094] Calculate T j =T j2 +K4T h ,

[0095] Calculate T t =T t2 +K4T h ;

[0096] in:

[0097] T m2 Indicates the preset value of high pressure temperature for slow frequency increase of the third compressor;

[0098] T x2 Indicates the preset value of the high-pressure temperature for limiting the frequency increase of the third compressor;

[0099] T j2 Indicates the preset value of the high-pressure temperature of the third compressor during frequency reduction;

[0100] T t2 Indicates the preset value of high pressure temperature of the third stop compressor;

[0101] In the step S3, the step S4 and the step S5, respectively, T k , or P c , or dT ly / dt is used to control the operation of the compressor.

[0102] Furthermore, the step S2 further includes:

[0103] M indicates that the compressor is subjected to T m The frequency affected and limited is 2HZ;

[0104] t x Indicates that the compressor is subjected to T m The frequency running time affected by the restriction is set to 30s;

[0105] N indicates that the compressor is subjected to T j The frequency reduced by the influence is 5HZ;

[0106] t y Indicates that the compressor is subjected to T j The frequency running time reduced due to the impact is set to 15s;

[0107] H y Indicates the preset value of the refrigerant liquid pipe temperature involved in the compressor frequency control, H y The preset value range is 1 to 20°C;

[0108] dT ly / dt represents the refrigerant liquid pipe temperature change rate collected by the controller, preferably collected every 10 seconds;

[0109] G m Indicates the preset value of the refrigerant liquid pipe temperature change rate that controls the slow frequency increase of the compressor, G m The preset value range is 0.01~5℃ / s;

[0110] G x Indicates the preset value of the refrigerant liquid pipe temperature change rate that controls the compressor to limit the frequency increase, G x The preset value range is 0.01~5℃ / s;

[0111] G j Indicates the preset value of the refrigerant liquid pipe temperature change rate for controlling the compressor frequency reduction, G j The preset value range is 0.01~5℃ / s;

[0112] G t Indicates the preset value of the refrigerant liquid pipe temperature change rate for controlling the compressor to stop, G t The preset value range is 0.01~5℃ / s;

[0113] P m Indicates the preset value of the compressor current that controls the slow frequency increase of the compressor, P m The preset value range is 1 to 80A;

[0114] P x Indicates the preset value of the compressor current that controls the compressor to limit the frequency increase, P x The preset value range is 1 to 80A;

[0115] P j Indicates the preset value of the compressor current for controlling the compressor frequency reduction, P j The preset value range is 1 to 80A;

[0116] P t Indicates the preset value of the compressor current that controls the compressor to stop, P t The preset value range is 1 to 80A;

[0117] Among them, Gm <G x <G j <G t , P m <P x <P j <P t .

[0118] Furthermore, the H y The default setting is 7°C.

[0119] Furthermore, the G m The default value is 0.05℃ / s.

[0120] Furthermore, the G x The default value is 0.1℃ / s.

[0121] Furthermore, the G j The default value is 0.15℃ / s.

[0122] Furthermore, the G t The default value is 0.25℃ / s.

[0123] Furthermore, the P m The default value is 20A.

[0124] Furthermore, the P x The default value is 21A.

[0125] Furthermore, the P j The default value is 23A.

[0126] Furthermore, the P t The default value is 30A.

[0127] Furthermore, the step S3 further includes:

[0128] K1 represents the water temperature correction coefficient of the heat pump's heating capacity, and the value of K1 is -0.2;

[0129] K2 represents the base value of the water temperature correction coefficient of the heat pump's heating capacity, and the value of K2 is 15.2;

[0130] S represents the first frequency control correction coefficient, and the value of S is -0.25;

[0131] A represents the second frequency control correction coefficient, and the value of A is 0.09;

[0132] B represents the third frequency control correction coefficient, and the value of B is 0.75;

[0133] C represents the fourth frequency control correction coefficient, and the value of C is -0.95;

[0134] D represents the fifth frequency control correction coefficient, and its value is 0.2;

[0135] T m0 Indicates the high pressure temperature preset value of the first compressor slowly increasing in frequency, T m0 The preset value range is 30~100℃;

[0136] T x0 Indicates the preset value of the high-pressure temperature of the first compressor limiting the frequency increase, T x0 The preset value range is 30~100℃;

[0137] T j0 Indicates the preset value of the high-pressure temperature of the first compressor, T j0 The preset value range is 30~100℃;

[0138] T t0 Indicates the preset value of the high pressure temperature of the first stopped compressor, T t0 The preset value range is 30~100℃;

[0139] Among them, T m0 <T x0 <T j0 <T t0 .

[0140] Furthermore, the T m0 The default value is 58°C.

[0141] Furthermore, the T x0 The default value is 60℃.

[0142] Furthermore, the T j0 The default value is 62°C.

[0143] Furthermore, the T t0 The default value is 64°C.

[0144] Furthermore, the step S4 further includes:

[0145] T m1 Indicates the preset value of high pressure temperature of the second compressor which is slowly increasing in frequency, T m1 The preset value range is 30~100℃;

[0146] Tx1 represents the preset value of the high-pressure temperature of the second compressor limiting the frequency increase, T x1 The preset value range is 30~100℃;

[0147] T j1 Indicates the preset value of the high pressure temperature of the second compressor, T j1 The preset value range is 30~100℃;

[0148] T t1 Indicates the preset value of the high pressure temperature of the second stop compressor, T t1 The preset value range is 30~100℃;

[0149] T h1 Indicates the first ambient temperature preset value, T h1 The preset value range is -40 to 55°C;

[0150] T h2 Indicates the second ambient temperature preset value, T h2 The preset value range is -40 to 55°C;

[0151] Among them, T m1 <T x1 <T j1 <T t1 , T h2 <T h1 ;

[0152] K3 represents the compressor load correction coefficient, which is 0.5.

[0153] Furthermore, the T m1 The default value is 63°C.

[0154] Furthermore, the T x1 The default value is 65°C.

[0155] Furthermore, the T j1 The preset default value is 67°C.

[0156] Furthermore, the T t1 The default value is 69°C.

[0157] Furthermore, the T h1 The default value is -10℃.

[0158] Furthermore, the T h2 The default value is -20℃.

[0159] Furthermore, the step S5 further includes:

[0160] T m2 Indicates the high pressure temperature preset value of the third compressor slow frequency increase, T m2 The preset value range is 30~100℃;

[0161] T x2 Indicates the preset value of the high-pressure temperature of the third compressor limiting the frequency increase, T x2 The preset value range is 30~100℃;

[0162] T j2 Indicates the preset value of the high pressure temperature of the third compressor, T j2 The preset value range is 30~100℃;

[0163] T t2 Indicates the preset value of high pressure temperature of the third stop compressor, T t2 The preset value range is 30~100℃;

[0164] Among them, T m2 <T x2 <T j2 <T t2 .

[0165] Furthermore, the T m2 The preset default value is 67°C.

[0166] Furthermore, the T x2 The default value is 69°C.

[0167] Furthermore, the T j2 The default value is 71°C.

[0168] Furthermore, the T t2 The preset default value is 73℃.

[0169] A control device for a heat pump system, comprising:

[0170] Memory; and

[0171] The processor coupled to the memory is configured to execute the above-mentioned method for controlling a heat pump compressor based on instructions stored in the memory.

[0172] An air source heat pump, comprising:

[0173] heat pump systems; and

[0174] According to the control device of the heat pump system.

[0175] A computer-readable storage medium includes computer program instructions, wherein the computer program instructions implement the above-mentioned control method for a heat pump compressor when executed by a processor.

[0176] The beneficial effects of the present invention are:

[0177] When the air source heat pump cannot collect the heat pump system pressure, the heat pump parameters are comprehensively analyzed through the system parameters, and the system pressure range and the heat pump heating capacity are estimated. That is, the heat pump heating capacity is estimated through comprehensive analysis of the heat pump parameters, and the compressor operation status is adjusted in time, taking into account the heat pump heating capacity and the high reliability operation of the system, thereby improving the operating reliability of the compressor and ensuring user use.

[0178] When the heat pump is heating or producing hot water, it monitors the system's inlet and outlet water temperatures, compressor operating current, and refrigerant liquid pipe temperature in real time, comprehensively analyzing whether the system pressure is too high. It also comprehensively analyzes the heat pump unit's heating capacity and implements multi-parameter control of the compressor speed. This ensures the heat pump unit has sufficient heating capacity to meet user needs and promptly adjusts the compressor frequency when pressure is too high to avoid compressor failure, improving the heat pump's usability and reliability. This enhances its ability to resist disturbances and uncertainties, allowing the control system to better adapt to site requirements and improve water supply quality and system efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0179] Figure 1 It is a schematic diagram of the working principle of the heat pump system of the present invention;

[0180] Figure 2 It is a flow chart of the control method of the heat pump compressor in the present invention. DETAILED DESCRIPTION

[0181] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0182] The performance of low-temperature air-source heat pumps is significantly affected by ambient temperature, especially in winter, when the ambient temperature is very low. When heating water at higher temperatures (e.g., above 60°C), low-temperature air-source heat pumps are less efficient. In related technologies, a compression system including a two-stage electronic expansion valve can be used to improve the efficiency of low-temperature air-source heat pumps.

[0183] Figure 1 Schematic diagram of the structure of a heat pump system according to some embodiments disclosed in the present invention.

[0184] like Figure 1As shown, the heat pump system includes a first heat exchanger 1 arranged outdoors, a second heat exchanger 2 using a water pump unit for water cooling and heat exchange, a compressor 3, a third heat exchanger 4 for replenishing air to the compressor 3, a first electronic expansion valve 5 arranged between the first heat exchanger 1 and the third heat exchanger 4, and a second electronic expansion valve 6 arranged between the third heat exchanger 4 and the second heat exchanger 2. The compressor 3 is connected between the first heat exchanger 1 and the second heat exchanger 2 through a refrigerant pipeline and a four-way valve 7. In addition, Figure 1 In the figure, port C of the four-way valve 7 is connected to the second heat exchanger 2, port D is connected to the air outlet of the compressor 3, port E is connected to the air supply port of the compressor 3 through the first heat exchanger 1 and the third heat exchanger 4, and port S is connected to the air inlet of the compressor 3.

[0185] The present invention discloses a control method for a heat pump compressor provided by some embodiments, such as Figure 2 As shown, the specific implementation method includes the following steps:

[0186] Step S1: The heat pump unit starts running.

[0187] The heat pump unit starts heating or hot water mode and then starts running. The controller collects the operating parameters of the heat pump unit.

[0188] The parameters collected by the controller include the heat pump operating environment temperature T h , heat exchanger inlet water temperature T in , heat exchanger outlet water temperature T ou , heat exchanger refrigerant liquid pipe temperature T ly and compressor operating current value P c， The heat exchanger inlet water temperature T in , the heat exchanger outlet water temperature T ou and the heat exchanger refrigerant liquid pipe temperature T ly These are the operating parameters corresponding to the second heat exchanger;

[0189] Step S2: The compressor automatically operates and adjusts according to PID.

[0190] After the heat pump unit starts running for a period of time, the controller begins to comprehensively judge the compressor frequency control temperature value T k , compressor frequency control current value P c The changes in the refrigerant liquid pipe temperature are determined and tested as follows, and the compressor is operated under the following conditions;

[0191] Step S2.1, when T k <T m , or T ly -T in ≥H y And dT ly / dt <G m , or Tk <T m And P c <P m , or P c <P m And T ly -T in ≥H y And dT ly / dt <G m , or T k <T m And P c <P m And T ly -T in ≥H y And dT ly / dt <G m When the compressor is running, the frequency of the compressor will automatically increase or decrease according to the fuzzy control parameters, and will not be affected by the correction of the heating capacity of the heat pump unit;

[0192] Step S2.2, when T m ≤T k <T x , or T ly -T in ≥H y And G m ≤dT ly / dt <G x , or T m ≤T k <T x And P m ≤P c <P x , or P m ≤P c <P x And T ly -T in ≥H y And G m ≤dT ly / dt <G x , or T m ≤T k <T x And P m ≤P c <P x And T ly -T in ≥H y And G m ≤dT ly / dt <G x When the compressor is in the deceleration and frequency increase control mode, the compressor can increase the frequency by M frequency at most each time, and the operation time is t xAfter a certain time, the heat pump unit is tested again as a deceleration and frequency increase condition, and the compressor frequency is increased to a maximum of M frequency each time;

[0193] Step S2.3, when T x ≤T k <T j , or P x ≤P c <P j , or T ly -T in ≥H y And G x ≤dT ly / dt<G j When the compressor is running at a certain frequency, the frequency of the compressor is limited.

[0194] Step S2.4, when T j ≤T k <T t , or P j ≤P c <P t , or T ly -T in ≥H y And G j ≤dT ly / dt<G t When the compressor frequency is reduced to N, t y After time, test again, if T k If the frequency control temperature value still meets the conditions of this interval, the frequency reduction conditions of the heat pump unit will be tested again;

[0195] Step S2.5, when T k ≥T t , or P c ≥P t , or T ly -T in ≥H y And dT ly / dt≥G t When the compressor stops running directly;

[0196] Where: T k =T ou , T k Indicates the frequency control temperature value of the compressor frequency collected in real time; when the high pressure sensor is not configured, the outlet water temperature T ou As an approximate alternative value for high-pressure temperature frequency control, this rule is obtained by summarizing experimental data. Or the outlet water temperature T ou Using T ly Instead, use T lyThe corresponding parameter values need to be reassigned when replacing; however, there is a certain error between the approximate value and the saturation temperature value corresponding to the actual high pressure, so the following calculation formula can be used to correct it;

[0197] Where: T m Indicates the budgeted high-pressure temperature value for the slow frequency increase of the compressor after correction based on the capacity of the heat pump unit;

[0198] T x Indicates the budgeted high-pressure temperature value for limiting the frequency increase of the compressor after correction based on the capacity of the heat pump unit;

[0199] T j Indicates the budgeted high-pressure temperature value for compressor frequency reduction after correction based on the heat pump unit capacity;

[0200] T t Indicates the budgeted high-pressure temperature value for stopping the compressor after correction based on the capacity of the heat pump unit;

[0201] M represents the compressor's high-pressure temperature and slow frequency increase value T m The frequency affected and limited is preferably 2HZ;

[0202] t x Indicates that the compressor is subjected to T m Frequency operation time limited by influence;

[0203] N indicates that the compressor is subjected to T j The frequency of the reduction due to the influence;

[0204] t y Indicates that the compressor is subjected to T j The frequency running time is reduced due to the impact;

[0205] H y Indicates the preset value of the refrigerant liquid pipe temperature involved in the compressor frequency control, H y The preset value range is 1~20℃, H y The default value is 7℃;

[0206] dT ly / dt represents the refrigerant liquid pipe temperature change rate collected by the controller, preferably collected every 10 seconds;

[0207] G m Indicates the preset value of the refrigerant liquid pipe temperature change rate that controls the slow frequency increase of the compressor, G m The preset value range is 0.01~5℃ / s, G m The default value is 0.05℃ / s;

[0208] G x Indicates the preset value of the refrigerant liquid pipe temperature change rate that controls the compressor to limit the frequency increase, G xThe preset value range is 0.01~5℃ / s, G x The default value is 0.1℃ / s;

[0209] G j Indicates the preset value of the refrigerant liquid pipe temperature change rate for controlling the compressor frequency reduction, G j The preset value range is 0.01~5℃ / s, G j The default value is 0.15℃ / s;

[0210] G t Indicates the preset value of the refrigerant liquid pipe temperature change rate for controlling the compressor to stop, G t The preset value range is 0.01~5℃ / s, G t The default value is 0.25℃ / s;

[0211] P m Indicates the preset value of the compressor current that controls the slow frequency increase of the compressor, P m The preset value range is 1~80A, P m The default value is 20A;

[0212] P x Indicates the preset value of the compressor current that controls the compressor to limit the frequency increase, P x The preset value range is 1~80A, P x The default value is 21A.

[0213] P j Indicates the preset value of the compressor current for controlling the compressor frequency reduction, P j The preset value range is 1~80A, P j The default value is 23A.

[0214] P t Indicates the preset value of the compressor current that controls the compressor to stop, P t The preset value range is 1~80A, P t The default value is 30A.

[0215] Step S3: When the first ambient temperature range is met, that is, when T h >T h1 hour:

[0216] Step S3.1, when the heat pump unit heats the water with a temperature difference of T ou -T in >Variable water temperature correction value T n When the pressure drops, correction is required; high pressure prediction correction is performed in real time, and compressor frequency reduction control is performed;

[0217] Calculate T m =Tm0 +Ti,

[0218] Calculate T x =T x0 +Ti,

[0219] Calculate T j =T j0 +Ti,

[0220] Calculate T t =T t0 +Ti;

[0221] Step S3.2, when T ou -T in ≤T n When , there is no need to increase the correction value. At this time, the heat pump system has sufficient high-pressure margin, and the heat pump unit can run freely to provide sufficient heating;

[0222] Calculate T m =T m0 ,

[0223] Calculate T x =T x0 ,

[0224] Calculate T j =T j0 ,

[0225] Calculate T t =T t0 ;

[0226] Where: Calculate T n =T in ×K1+K2, ------Formula 1

[0227] T n It represents the variable water temperature reference frequency control correction value calculated according to the proposed formula 1, which is related to the water temperature;

[0228] K1 represents the water temperature correction coefficient of the heat pump's heating capacity, and the optimal value of K1 is -0.2;

[0229] K2 represents the base value of the water temperature correction coefficient of the heat pump's heating capacity, and the optimal value of K2 is 15.2;

[0230] In formula 1, the inlet water temperature T in Determine the basic correction value; the higher the water temperature, the lower the correction base value, and it is easier to meet the correction conditions; the lower the water temperature, the higher the correction base value, and it is more difficult to meet the correction conditions. If the water temperature is too low, no correction is required;

[0231] Where: Calculate Ti = [S × (T ou -T in )2 +A×T n 2 +B×(T ou -T in )+C×T n +D×(T ou -T in )×T n +T0】------Formula 2

[0232] Ti represents the frequency control correction value related to the heat pump heating capacity calculated according to the proposed formula 2, which is associated with the heat pump operating capacity;

[0233] S represents the first frequency control correction coefficient, and the optimal value of S is -0.25;

[0234] A represents the second frequency control correction coefficient, and the optimal value of A is 0.09;

[0235] B represents the third frequency control correction coefficient, and the optimal value of B is 0.75;

[0236] C represents the fourth frequency control correction coefficient, and the optimal value of C is -0.95;

[0237] D represents the fifth frequency control correction coefficient, and the optimal value of D is 0.2;

[0238] In formula 2, the water flow through the second heat exchanger, the temperature difference between the outlet and inlet water of the second heat exchanger (T ou -T in ) can calculate the approximate heating capacity of the heat pump unit; under the condition of constant ambient temperature and water temperature, when the water flow rate is fixed, the heating capacity of the heat pump unit is mainly determined by (T ou -T in ) is determined; therefore, the frequency control temperature value can be further corrected by formula 2; and when the compressor frequency is limited or reduced, the heating capacity of the heat pump unit can be taken into account to meet the user's use needs as much as possible, avoiding the situation where the heat pump unit is insufficient in heating due to premature frequency limitation or reduction.

[0239] T m0 Indicates the high pressure temperature preset value of the first compressor slowly increasing in frequency, T m0 The preset value range is 30~100℃, T m0 The preset default value is 58℃;

[0240] T x0 Indicates the preset value of the high-pressure temperature of the first compressor limiting the frequency increase, T x0 The preset value range is 30~100℃, T x0 The default value is 60℃;

[0241] T j0Indicates the preset value of the high-pressure temperature of the first compressor, T j0 The preset value range is 30~100℃, T j0 The default value is 62℃;

[0242] T t0 Indicates the preset value of the high pressure temperature of the first stopped compressor, T t0 The preset value range is 30~100℃, T t0 The default value is 64℃;

[0243] T h1 Indicates the first ambient temperature preset value, T h1 The preset value range is -40~55℃, T h1 The default value is -10℃;

[0244] Step S4: When the second ambient temperature range is met, that is, T h2 <T h ≤T h1 hour:

[0245] Step S4.1, when the heat pump heat exchange water temperature difference T ou -T in >Variable water temperature correction value T n When , it is necessary to make corrections to the compressor load and heating capacity frequency control;

[0246] Calculate T m =T m1 +Ti+K3T h ,

[0247] Calculate T x =T x1 +Ti+K3T h ,

[0248] Calculate T j =T j1 +Ti+K3T h ,

[0249] Calculate T t =T t1 +Ti+K3T h ;

[0250] Step S4.2, when T ou -T in ≤T n When , only the compressor load correction is required;

[0251] Calculate T m =T m1 +K3T h ,

[0252] Calculate T x =T x1 +K3T h ,

[0253] Calculate T j =T j1 +K3T h ,

[0254] Calculate T t =T t1 +K3T h ;

[0255] in:

[0256] T m1 Indicates the preset value of high pressure temperature of the second compressor which is slowly increasing in frequency, T m1 The preset value range is 30~100℃, T m1 The preset default value is 63℃;

[0257] T x1 Indicates the preset value of the high-pressure temperature of the second compressor limiting the frequency increase, T x1 The preset value range is 30~100℃, T x1 The default value is 65℃;

[0258] T j1 Indicates the preset value of the high pressure temperature of the second compressor, T j1 The preset value range is 30~100℃, T j1 The default value is 67℃;

[0259] T t1 Indicates the preset value of the high pressure temperature of the second stop compressor, T t1 The preset value range is 30~100℃, T t1 The default value is 69℃;

[0260] T h2 Indicates the second ambient temperature preset value, T h2 The preset value range is -40~55℃, T h2 The default value is -20℃;

[0261] K3 represents the compressor load correction factor, and the optimal value of K3 is 0.5;

[0262] Step S5: When the third ambient temperature range is met, that is, when T h ≤T h2 hour:

[0263] Step S5.1, when the heat pump heat exchange water temperature difference T ou -T in>Variable water temperature correction value T n When , it is necessary to make corrections to the compressor load and heating capacity frequency control;

[0264] Calculate T m =T m2 +Ti+K4T h ,

[0265] Calculate T x =T x2 +Ti+K4T h ,

[0266] Calculate T j =T j2 +Ti+K4T h ,

[0267] Calculate T t =T t2 +Ti+K4T h ;

[0268] Step S5.2, when T ou -T in ≤T n When , only the compressor load correction is required;

[0269] Calculate T m =T m2 +K4T h ,

[0270] Calculate T x =T x2 +K4T h ,

[0271] Calculate T j =T j2 +K4T h ,

[0272] Calculate T t =T t2 +K4T h ;

[0273] in:

[0274] T m2 Indicates the high pressure temperature preset value of the third compressor slow frequency increase, T m2 The preset value range is 30~100℃, T m2 The preset default value is 67℃;

[0275] T x2 Indicates the preset value of the high-pressure temperature of the third compressor limiting the frequency increase, T x2 The preset value range is 30~100℃, T x2The default value is 69℃;

[0276] T j2 Indicates the preset value of the high pressure temperature of the third compressor, T j2 The preset value range is 30~100℃, T j2 The preset default value is 71°C;

[0277] T t2 Indicates the preset value of high pressure temperature of the third stop compressor, T t2 The preset value range is 30~100℃, T t2 The preset default value is 73℃;

[0278] In step S3, step S4 and step S5, respectively, T k , or P c , or dT ly / dt is used to control the operation of the compressor.

[0279] In this embodiment, when the air source heat pump is unable to collect the heat pump system pressure, the heat pump parameters are comprehensively analyzed through system parameters, and the system pressure range and heat pump heating conditions are estimated, so as to timely adjust the compressor operating status, improve the operating reliability of the compressor, ensure the reliability of user use, and at the same time take into account the heat pump heating amount and high-reliability operation of the system.

[0280] In addition, the control device of the heat pump system includes a memory and a processor coupled to the memory, and the processor is configured to execute the method of the above embodiment based on instructions stored in the memory.

[0281] The memory may include, for example, a system memory, a fixed non-volatile storage medium, etc. The system memory may store, for example, an operating system, an application program, a boot loader, and other programs.

[0282] The heat pump system control device may also include input / output interfaces, a network interface, and a storage interface. These interfaces, as well as the memory and processor, can be connected via a bus, for example. The input / output interfaces provide connections for input / output devices such as displays, mice, keyboards, and touch screens. The network interface provides connections for various networked devices. The storage interface provides connections for external storage devices such as SD cards and USB flash drives.

[0283] The embodiments disclosed in the present invention further provide an air source heat pump, comprising: a heat pump system and a control device of the heat pump system of the above embodiments.

[0284] The embodiments disclosed in the present invention further provide a computer-readable storage medium including computer program instructions, which, when executed by a processor, implement the control method for the heat pump compressor of any one of the above embodiments.

[0285] Thus far, the various embodiments disclosed in the present invention have been described in detail. To avoid obscuring the concept of the present invention, some details known in the art have not been described. Based on the above description, those skilled in the art can fully understand how to implement the technical solutions disclosed herein.

[0286] Those skilled in the art will appreciate that the embodiments disclosed herein may be provided as methods, systems, or computer program products. Therefore, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present disclosure may take the form of a computer program product implemented on one or more computer-usable non-transitory storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0287] The present disclosure is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present disclosure. It should be understood that the functions specified in one or more processes in the flowchart and / or one or more blocks in the block diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate the functions for implementing the functions specified in the flowchart. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0288] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0289] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1A step that specifies a function in one or more boxes.

[0290] The above-described embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Any equivalent changes made based on the shape, structure and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for controlling a heat pump compressor, characterized in that: The heat pump system includes a first heat exchanger disposed outdoors, a second heat exchanger using a water pump unit for water cooling and heat exchange, a compressor, a third heat exchanger for supplying air to the compressor, a first electronic expansion valve disposed between the first heat exchanger and the third heat exchanger, and a second electronic expansion valve disposed between the third heat exchanger and the second heat exchanger. The compressor is connected between the first heat exchanger and the second heat exchanger via a refrigerant pipeline and a four-way valve. The control method of the heat pump compressor includes the following steps: Step S1: The heat pump unit starts running. The heat pump unit starts heating or hot water mode and then starts running. The controller collects the operating parameters of the heat pump unit. The parameters collected by the controller include the heat pump operating environment temperature T h , heat exchanger inlet water temperature T in , heat exchanger outlet water temperature T ou , heat exchanger refrigerant liquid pipe temperature T ly and compressor operating current value P c , the heat exchanger inlet water temperature T in , the heat exchanger outlet water temperature T ou and the heat exchanger refrigerant liquid pipe temperature T ly These are the operating parameters corresponding to the second heat exchanger; Step S2: The compressor automatically operates and adjusts according to PID. After the heat pump unit starts running for a period of time, the controller begins to comprehensively judge the compressor frequency control temperature value T k , compressor frequency control current value P c The changes in the refrigerant liquid pipe temperature are determined and tested as follows, and the compressor is operated under the following conditions; Step S2.1, when T k <T m , or T ly -T in ≥H y And dT ly / dt<G m , or T k <T m And P c <P m , or P c <P m And T ly -T in ≥H y And dT ly / dt<G m , or T k <T m And P c <P m And T ly -T in ≥H y And dT ly / dt<G m When the compressor is running, the frequency of the compressor will automatically increase or decrease according to the fuzzy control parameters, and will not be affected by the correction of the heating capacity of the heat pump unit; Step S2.2, when T m ≤T k <T x , or T ly -T in ≥H y And G m ≤dT ly / dt<G x , or T m ≤T k <T x And P m ≤P c <P x , or P m ≤P c <P x And T ly -T in ≥H y And G m ≤dT ly / dt<G x , or T m ≤T k <T x And P m ≤P c <P x And T ly -T in ≥H y And G m ≤dT ly / dt<G x When the compressor is in the deceleration and frequency increase control mode, the compressor can increase the frequency by M frequency at most each time, and the operation time is t x After a certain time, the heat pump unit is tested again as a deceleration and frequency increase condition, and the compressor frequency is increased to a maximum of M frequency each time; Step S2.3, when T x ≤T k <T j , or T Iy -T in ≥H y And G x ≤dT ly / dt<G j , or T x ≤T k <T j And P x ≤P c <P j , or P x ≤P c <P j And T ly -T in ≥H y And G x ≤dT ly / dt<G j , or T x ≤T k <T j And P x ≤P c <P j And T ly -T in ≥H y And G x ≤dT ly / dt<G j When the compressor is running at a certain frequency, the frequency of the compressor is limited. Step S2.4, when T j ≤T k <T t , or T ly -T in ≥H y And G j ≤dT ly / dt<G t , or T j ≤T k <T t And P j ≤P c <P t , or P j ≤P c <P t And T ly -T in ≥H y And G j ≤dT ly / dt<G t , or T j ≤T k <T t And P j ≤P c <P t And T ly -T in ≥H y And G j ≤dT ly / dt<G t When the compressor frequency is reduced to N, t y After time, test again, if T k If the frequency control temperature value still meets the conditions of this interval, the frequency reduction conditions of the heat pump unit will be tested again; Step S2.5, when T k ≥T t , or T ly -T in ≥H y And dT ly / dt≥G t , or T k ≥T t And P c ≥P t , or P c ≥P t And T ly -T in ≥H y And dT ly / dt≥G t , or T k ≥T t And P c ≥P t And T ly -T in ≥H y And dT ly / dt≥G t When the compressor stops running directly; Where: T k =T ou , T k Indicates the frequency control temperature value of the compressor frequency collected in real time; when the high pressure sensor is not configured, the outlet water temperature T ou As an approximate alternative value for high-pressure temperature frequency control; or the outlet water temperature T of the second heat exchanger ou Using T ly Instead, use T ly When replacing, the corresponding parameter values need to be reassigned; in: T m Indicates the budgeted high-pressure temperature value for the slow frequency increase of the compressor after correction based on the capacity of the heat pump unit; T x Indicates the budgeted high-pressure temperature value for limiting the frequency increase of the compressor after correction based on the capacity of the heat pump unit; T j Indicates the budgeted high-pressure temperature value for compressor frequency reduction after correction based on the heat pump unit capacity; T t Indicates the budgeted high-pressure temperature value for stopping the compressor after correction based on the capacity of the heat pump unit; M indicates that the compressor is subjected to T m Frequency of influence and limitation; t x Indicates that the compressor is subjected to T m Frequency operation time limited by influence; N indicates that the compressor is subjected to T j The frequency of the reduction due to the influence; t y Indicates that the compressor is subjected to T j The frequency running time is reduced due to the impact; H y Indicates the preset value of the refrigerant liquid pipe temperature involved in compressor frequency control; dT ly / dt represents the rate of change of the refrigerant liquid pipe temperature collected by the controller; G m Indicates the preset value of the refrigerant liquid pipe temperature change rate that controls the slow frequency increase of the compressor; G x Indicates the preset value of the refrigerant liquid pipe temperature change rate that controls the compressor to limit the frequency increase; G j Indicates the preset value of the refrigerant liquid pipe temperature change rate for controlling the compressor frequency reduction; G t Indicates the preset value of the refrigerant liquid pipe temperature change rate for controlling the compressor to stop; P m Indicates the preset value of the compressor current that controls the slow frequency increase of the compressor; P x Indicates the preset value of the compressor current that controls the compressor to limit the frequency increase; P j Indicates the preset value of the compressor current for controlling the compressor frequency reduction; P t Indicates the preset value of the compressor current for controlling the compressor to stop; Step S3: When the first ambient temperature range is met, that is, when T h >T h1 hour: Step S3.1, when the heat pump unit heats the water with a temperature difference of T ou -T in >Variable water temperature correction value T n When the pressure drops, correction is required; high pressure prediction correction is performed in real time, and compressor frequency reduction control is performed; Calculate T m =T m0 +Ti, Calculate T x =T x0 +Ti, Calculate T j =T j0 +Ti, Calculate T t =T t0 +Ti; Step S3.2, when T ou -T in ≤T n When , there is no need to increase the correction value. At this time, the heat pump system has sufficient high-pressure margin, and the heat pump unit can run freely to provide sufficient heating; Calculate T m =T m0 , Calculate T x =T x0 , Calculate T j =T j0 , Calculate T t =T t0 ; Where: Calculate T n =T in ×K1+K2, ------Formula 1 T n represents the variable water temperature reference frequency control correction value calculated according to the proposed formula 1, which is related to the water temperature; K1 represents the water temperature correction coefficient of the heat pump's heating capacity; K2 represents the base value of the water temperature correction coefficient of the heat pump's heating capacity; By inlet water temperature T in Determine the basic correction value; the higher the water temperature, the lower the correction base value, and it is easier to meet the correction conditions; the lower the water temperature, the higher the correction base value, and it is more difficult to meet the correction conditions. If the water temperature is too low, no correction is required; Where: Calculate Ti = [S × (T ou -T in ) 2 +A×T n 2 +B×(T ou -T in )+C×T n +D×(T ou -T in )×T n +T0】------Formula 2 Ti represents the frequency control correction value related to the heat pump heating capacity calculated according to the proposed formula 2, which is associated with the heat pump operating capacity; S represents the first frequency control correction coefficient; A represents the second frequency control correction coefficient; B represents the third frequency control correction coefficient; C represents the fourth frequency control correction coefficient; D represents the fifth frequency control correction coefficient; The water flow through the second heat exchanger, the temperature difference between the outlet and inlet water of the second heat exchanger (T ou -T in ) calculates the approximate heating capacity of the heat pump unit; under the condition of constant ambient temperature and water temperature, when the water flow rate is fixed, the heating capacity of the heat pump unit is mainly determined by (T ou -T in ) determined; further correct the frequency control temperature value by formula 2; and realize that when the compressor frequency is limited or reduced, the heating capacity of the heat pump unit can meet the user's use needs as much as possible, avoiding the situation where the heat pump unit is insufficiently heated due to premature frequency reduction; T m0 Indicates the preset value of high pressure temperature for slow frequency increase of the first compressor; T x0 Indicates the preset value of the high-pressure temperature for limiting the frequency increase of the first compressor; T j0 Indicates the preset value of the high-pressure temperature of the first compressor during frequency reduction; T t0 Indicates the preset value of the high pressure temperature of the first stopped compressor; T h1 Indicates the first ambient temperature preset value; Step S4: When the second ambient temperature range is met, that is, T h2 <T h ≤T h1 hour: Step S4.1, when the heat pump heat exchange water temperature difference T ou -T in >Variable water temperature correction value T n When , it is necessary to make corrections to the compressor load and heating capacity frequency control; Calculate T m =T m1 +Ti+K3T h , Calculate T x =T x1 +Ti+K3T h , Calculate T j =T j1 +Ti+K3T h , Calculate T t =T t1 +Ti+K3T h ; Step S4.2, when T ou -T in ≤T n When , only the compressor load correction is required; Calculate T m =T m1 +K3T h , Calculate T x =T x1 +K3T h , Calculate T j =T j1 +K3T h , Calculate T t =T t1 +K3T h ; in: T m1 Indicates the preset value of high pressure temperature for slow frequency increase of the second compressor; T x1 Indicates the preset value of the high-pressure temperature for limiting the frequency increase of the second compressor; T j1 Indicates the preset value of the high-pressure temperature of the second compressor during frequency reduction; T t1 Indicates the preset value of the high pressure temperature of the second stopped compressor; T h2 Indicates the second ambient temperature preset value; K3 represents the compressor load correction factor; Step S5: When the third ambient temperature range is met, that is, when T h ≤T h2 hour: Step S5.1, when the heat pump heat exchange water temperature difference T ou -T in >Variable water temperature correction value T n When , it is necessary to make corrections to the compressor load and heating capacity frequency control; Calculate T m =T m2 +Ti+K4T h , Calculate T x =T x2 +Ti+K4T h , Calculate T j =T j2 +Ti+K4T h , Calculate T t =T t2 +Ti+K4T h ; Step S5.2, when T ou -T in ≤T n When , only the compressor load correction is required; Calculate T m =T m2 +K4T h , Calculate T x =T x2 +K4T h , Calculate T j =T j2 +K4T h , Calculate T t =T t2 +K4T h ; in: T m2 Indicates the preset value of high pressure temperature for slow frequency increase of the third compressor; T x2 Indicates the preset value of the high-pressure temperature for limiting the frequency increase of the third compressor; T j2 Indicates the preset value of the high-pressure temperature of the third compressor during frequency reduction; T t2 Indicates the preset value of high pressure temperature of the third stop compressor; In the step S3, the step S4 and the step S5, respectively, T k , or P c , or dT ly / dt is used to control the operation of the compressor.

2. A heat pump compressor control method according to claim 1, characterized in that: The step S2 further includes: M indicates that the compressor is subjected to T m The frequency affected and limited is 2Hz; t x Indicates that the compressor is subjected to T m The frequency running time affected by the restriction is set to 30s; N indicates that the compressor is subjected to T j The frequency reduced by the influence is 5Hz; t y Indicates that the compressor is subjected to T j The frequency running time reduced due to the impact is set to 15s; H y Indicates the preset value of the refrigerant liquid pipe temperature involved in the compressor frequency control, H y The preset value range is 1 to 20°C; dT ly / dt represents the refrigerant liquid pipe temperature change rate collected by the controller, which is collected every 10 seconds; G m Indicates the preset value of the refrigerant liquid pipe temperature change rate that controls the slow frequency increase of the compressor, G m The preset value range is 0.01~5℃ / s; G x Indicates the preset value of the refrigerant liquid pipe temperature change rate that controls the compressor to limit the frequency increase, G x The preset value range is 0.01~5℃ / s; G j Indicates the preset value of the refrigerant liquid pipe temperature change rate for controlling the compressor frequency reduction, G j The preset value range is 0.01~5℃ / s; G t Indicates the preset value of the refrigerant liquid pipe temperature change rate for controlling the compressor to stop, G t The preset value range is 0.01~5℃ / s; P m Indicates the preset value of the compressor current that controls the slow frequency increase of the compressor, P m The preset value range is 1 to 80A; P x Indicates the preset value of the compressor current that controls the compressor to limit the frequency increase, P x The preset value range is 1 to 80A; P j Indicates the preset value of the compressor current for controlling the compressor frequency reduction, P j The preset value range is 1 to 80A; P t Indicates the preset value of the compressor current that controls the compressor to stop, P t The preset value range is 1 to 80A; Among them, G m <G x <G j <G t , P m <P x <P j <P t .

3. The control method of a heat pump compressor according to claim 2, characterized in that: The H y The default setting is 7°C.

4. The heat pump compressor control method according to claim 2, characterized in that: The G m The default value is 0.05℃ / s.

5. The heat pump compressor control method according to claim 2, characterized in that: The G x The default value is 0.1℃ / s.

6. The heat pump compressor control method according to claim 2, characterized in that: The G j The default value is 0.15℃ / s.

7. The method for controlling a heat pump compressor according to claim 2, wherein: The G t The default value is 0.25℃ / s.

8. The method for controlling a heat pump compressor according to claim 2, wherein: The P m The default value is 20A.

9. The heat pump compressor control method according to claim 2, characterized in that: The P x The default value is 21A.

10. The heat pump compressor control method according to claim 2, characterized in that: The P j The default value is 23A.

11. The heat pump compressor control method according to claim 2, characterized in that: The P t The default value is 30A.

12. The heat pump compressor control method according to claim 1, characterized in that: The step S3 further includes: K1 represents the water temperature correction coefficient of the heat pump's heating capacity, and the value of K1 is -0.2; K2 represents the base value of the water temperature correction coefficient of the heat pump's heating capacity, and the value of K2 is 15.2; S represents the first frequency control correction coefficient, and the value of S is -0.25; A represents the second frequency control correction coefficient, and the value of A is 0.09; B represents the third frequency control correction coefficient, and the value of B is 0.75; C represents the fourth frequency control correction coefficient, and the value of C is -0.95; D represents the fifth frequency control correction coefficient, and its value is 0.2; T m0 Indicates the high pressure temperature preset value of the first compressor slowly increasing in frequency, T m0 The preset value range is 30~100℃; T x0 Indicates the preset value of the high-pressure temperature of the first compressor limiting the frequency increase, T x0 The preset value range is 30~100℃; T j0 Indicates the preset value of the high-pressure temperature of the first compressor, T j0 The preset value range is 30~100℃; T t0 Indicates the preset value of the high pressure temperature of the first stopped compressor, T t0 The preset value range is 30~100℃; m0 <T x0 <T j0 <T t0 .

13. The method for controlling a heat pump compressor according to claim 12, characterized in that: The T m0 The default value is 58°C.

14. The heat pump compressor control method according to claim 13, characterized in that: The T x0 The default value is 60℃.

15. The method for controlling a heat pump compressor according to claim 14, characterized in that: The T j0 The default value is 62°C.

16. The heat pump compressor control method according to claim 15, characterized in that: The T t0 The default value is 64°C.

17. The method for controlling a heat pump compressor according to claim 1, characterized in that: The step S4 further includes: T m1 Indicates the preset value of high pressure temperature of the second compressor which is slowly increasing in frequency, T m1 The preset value range is 30~100℃; Tx1 represents the preset value of the high-pressure temperature of the second compressor limiting the frequency increase, T x1 The preset value range is 30~100℃; T j1 Indicates the preset value of the high pressure temperature of the second compressor, T j1 The preset value range is 30~100℃; T t1 Indicates the preset value of the high pressure temperature of the second stop compressor, T t1 The preset value range is 30~100℃; T h1 Indicates the first ambient temperature preset value, T h1 The preset value range is -40 to 55°C; T h2 Indicates the second ambient temperature preset value, T h2 The preset value range is -40 to 55°C; Among them, T m1 <T x1 <T j1 <T t1 , T h2 <T h1 ; K3 represents the compressor load correction coefficient, which is 0.

5.

18. The heat pump compressor control method according to claim 17, characterized in that: The T m1 The default value is 63°C.

19. The heat pump compressor control method according to claim 17, characterized in that: The T x1 The default value is 65°C.

20. The heat pump compressor control method according to claim 17, characterized in that: The T j1 The preset default value is 67°C.

21. The heat pump compressor control method according to claim 17, characterized in that: The T t1 The default value is 69°C.

22. The heat pump compressor control method according to claim 17, characterized in that: The T h1 The default value is -10℃.

23. The method for controlling a heat pump compressor according to claim 17, wherein: The T h2 The default value is -20℃.

24. The method for controlling a heat pump compressor according to claim 1, characterized in that: The step S5 further includes: T m2 Indicates the high pressure temperature preset value of the third compressor slow frequency increase, T m2 The preset value range is 30~100℃; T x2 Indicates the preset value of the high-pressure temperature of the third compressor limiting the frequency increase, T x2 The preset value range is 30~100℃; T j2 Indicates the preset value of the high pressure temperature of the third compressor, T j2 The preset value range is 30~100℃; T t2 Indicates the preset value of high pressure temperature of the third stop compressor, T t2 The preset value range is 30~100℃; Among them, T m2 <T x2 <T j2 <T t2 .

25. The method for controlling a heat pump compressor according to claim 24, characterized in that: The T m2 The preset default value is 67°C.

26. The method for controlling a heat pump compressor according to claim 24, characterized in that: The T x2 The default value is 69°C.

27. The method for controlling a heat pump compressor according to claim 24, characterized in that: The T j2 The default value is 71°C.

28. The method for controlling a heat pump compressor according to claim 24, characterized in that: The T t2 The preset default value is 73℃.

29. A control device for a heat pump system, characterized in that: include: Memory; and A processor coupled to the memory is configured to execute the heat pump compressor control method according to any one of claims 1 to 28 based on instructions stored in the memory.

30. An air source heat pump, characterized in that: include: heat pump systems; and A control device for a heat pump system according to claim 29.

31. A computer-readable storage medium, characterized in that The method comprises computer program instructions, wherein when the computer program instructions are executed by a processor, the method for controlling a heat pump compressor according to any one of claims 1 to 28 is implemented.

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