Control method and control device of heat pump system

Abstract

The invention discloses a control method and device for a heat pump system. The control method comprises the steps that the actual electricity price, the actual energy efficiency ratio of the heat pump system and the actual temperature of an acting object of the heat pump system are obtained; according to at least two of the actual electricity price, the actual energy efficiency ratio of the heat pump system and the actual temperature of the heat pump system acting object, a control proportion value is calculated; and determining the actual frequency of the compressor according to the control proportion value and the target frequency corresponding to the current moment, and controlling the compressor to operate at the actual frequency. The frequency of the compressor is determined by integrating at least two of the electricity price, the temperature and the energy efficiency ratio, at least two of energy efficiency, economical efficiency and user comfort can be balanced, and the problem of multi-target conflict in the control process of the heat pump system is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pump systems, and in particular, to a control method and a control device for a heat pump system. Background Art

[0002] As an efficient and environmentally friendly heating and cooling device, a heat pump system is applied to the fields of building energy conservation and renewable energy utilization.

[0003] However, there are still some deficiencies in the existing control methods for heat pump systems. First of all, most control strategies are too simple and only focus on a single goal, unable to balance economy, user comfort, and energy efficiency ratio, etc. Summary of the Invention

[0004] The present invention provides a control method and a control device for a heat pump system to solve the problem of a single goal in the control method of a traditional heat pump system.

[0005] According to one aspect of the present invention, a control method for a heat pump system is provided, and the heat pump system includes a compressor;

[0006] The control method for the heat pump system includes:

[0007] Obtain the actual electricity price, the actual energy efficiency ratio of the heat pump system, and the actual temperature of the object affected by the heat pump system;

[0008] Calculate a control ratio value according to at least two of the actual electricity price, the actual energy efficiency ratio of the heat pump system, and the actual temperature of the object affected by the heat pump system;

[0009] Determine the actual frequency of the compressor according to the control ratio value and the target frequency corresponding to the current moment, and control the compressor to operate at the actual frequency.

[0010] Optionally, the calculating a control ratio value according to at least two of the actual electricity price, the actual energy efficiency ratio of the heat pump system, and the actual temperature of the object affected by the heat pump system includes:

[0011] Calculate the control ratio value according to the actual electricity price, the actual energy efficiency ratio of the heat pump system, and the actual temperature of the object affected by the heat pump system.

[0012] Optionally, use the reward value calculated based on the reward function as the control ratio value;

[0013] Wherein, the reward function satisfies:

[0014]

[0015] Let \(R\) be the reward value, \(\omega_1\) be the first weight, \(\omega_2\) be the second weight, \(\omega_3\) be the third weight, \(COP_1\) be the actual coefficient of performance of the heat pump system, \(COP_0\) be the reference coefficient of performance of the heat pump system, \(T_1\) be the actual temperature of the object on which the heat pump system acts, \(T_0\) be the preset temperature of the object on which the heat pump system acts, \(m_0\) be the reference electricity price, and \(m_1\) be the actual electricity price.

[0016] Optionally, calculating the control ratio value according to the actual electricity price, the actual coefficient of performance of the heat pump system, and the actual temperature of the object on which the heat pump system acts includes:

[0017] Determine the electricity price stage to which the current moment belongs; the electricity price stage includes at least a peak time stage, a valley time stage, and a normal time stage, and at least one of the first weight, the second weight, and the third weight is different in different electricity price stages;

[0018] Determine the first weight, the second weight, and the third weight according to the electricity price stage to which the current moment belongs and a preset correspondence; the preset correspondence is the correspondence between the electricity price stage and the first weight, the second weight, and the third weight;

[0019] Calculate the reward value according to the first weight, the second weight, the third weight, the actual electricity price, the actual coefficient of performance of the heat pump system, the actual temperature of the object on which the heat pump system acts, and the reward function, and use it as the control ratio value.

[0020] Optionally, the second weight in the peak time stage is greater than the first weight in the peak time stage and greater than the third weight in the peak time stage;

[0021] The third weight in the valley time stage is greater than the first weight in the valley time stage and greater than the second weight in the valley time stage;

[0022] The third weight in the normal time stage is greater than the first weight in the normal time stage and greater than the second weight in the normal time stage.

[0023] Optionally, determining the actual frequency of the compressor according to the control ratio value and the target frequency corresponding to the current moment includes:

[0024] Take the first frequency value obtained based on the compressor frequency calculation function as the actual frequency of the compressor;

[0025] Among them, the compressor frequency calculation function satisfies:

[0026] \(P_0 = R_1\cdot P_1\); where \(R_1\) is the control ratio value, \(P_1\) is the target frequency corresponding to the current moment, and \(P_0\) is the first frequency value.

[0027] Optionally, determining the actual frequency of the compressor according to the control ratio value and the target frequency corresponding to the current moment includes:

[0028] Obtaining a first frequency value of the compressor based on the compressor frequency calculation function;

[0029] When the first frequency value of the compressor is greater than or equal to the first set threshold and less than or equal to the second set threshold, using the first frequency value as the actual frequency of the compressor;

[0030] When the first frequency value of the compressor is greater than the second set threshold, using the second set threshold as the actual frequency of the compressor;

[0031] When the first frequency value of the compressor is less than the first set threshold, using the first set threshold as the actual frequency of the compressor;

[0032] Wherein, the compressor frequency calculation function satisfies:

[0033] P0 = R1·P1; where R1 is the control ratio value, P1 is the target frequency corresponding to the current moment, and P0 is the first frequency value.

[0034] Optionally, the heat pump system further includes an energy storage module connected to the compressor;

[0035] The control method of the heat pump system further includes:

[0036] Determining the electricity price stage to which the current moment belongs; the electricity price stage at least includes a peak time stage, a valley time stage, and a normal time stage;

[0037] When the electricity price stage to which the current moment belongs is the valley time stage or the normal time stage, and the actual temperature of the object on which the heat pump system acts reaches the preset temperature of the object on which the heat pump system acts, controlling the energy storage module to store energy.

[0038] Optionally, the heat pump system further includes an energy storage module connected to the compressor;

[0039] The control method of the heat pump system further includes:

[0040] Determining the electricity price stage to which the current moment belongs; the electricity price stage at least includes a peak time stage, a valley time stage, and a normal time stage;

[0041] When the electricity price stage to which the current moment belongs is the peak time stage, controlling the energy storage module to output energy.

[0042] According to another aspect of the present invention, there is provided a control device for a heat pump system, the heat pump system including a compressor;

[0043] The control device of the heat pump system includes:

[0044] An acquisition module, configured to acquire the actual electricity price, the actual energy efficiency ratio of the heat pump system, and the actual temperature of the object on which the heat pump system acts;

[0045] A calculation module, configured to calculate a control ratio value according to at least two of the actual electricity price, the actual energy efficiency ratio of the heat pump system, and the actual temperature of the object on which the heat pump system acts;

[0046] A control module, configured to determine the actual frequency of the compressor according to the control ratio value and the target frequency corresponding to the current moment, and control the compressor to operate at the actual frequency.

[0047] The technical solution of the embodiment of the present invention acquires the actual electricity price, the actual energy efficiency ratio of the heat pump system, and the actual temperature of the object on which the heat pump system acts in real time, calculates a control ratio value according to at least two of the actual electricity price, the actual energy efficiency ratio of the heat pump system, and the actual temperature of the object on which the heat pump system acts at any moment, and then determines the actual frequency of the compressor according to the control ratio value. Determining the frequency of the compressor by integrating at least two of the electricity price, temperature, and energy efficiency ratio can balance at least two of energy efficiency, economy, and user comfort, and solve the problem of multi-objective conflict in the control process of the heat pump system.

[0048] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. Description of the Drawings

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0050] Figure 1 It is a flowchart of a control method for a heat pump system provided by an embodiment of the present invention;

[0051] Figure 2 It is a flowchart of another control method for a heat pump system provided by an embodiment of the present invention;

[0052] Figure 3 It is a flowchart of yet another control method for a heat pump system provided by an embodiment of the present invention;

[0053] Figure 4Schematic structural diagram of a control device for a heat pump system provided by an embodiment of the present invention;

[0054] Figure 5 Schematic structural diagram of a heat pump system provided by an embodiment of the present invention. Detailed implementation manners

[0055] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0056] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above drawings are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0057] Figure 1 Flowchart of a control method for a heat pump system provided by an embodiment of the present invention. This embodiment is applicable to the situation of controlling the operation of the heat pump system. This method can be executed by a control device of the heat pump system, and the control device of the heat pump system can be implemented in the form of hardware and / or software.

[0058] As Figure 1 shown, the method includes:

[0059] S110: Obtain the actual electricity price, the actual energy efficiency ratio of the heat pump system, and the actual temperature of the object affected by the heat pump system.

[0060] Specifically, it can be to obtain the actual electricity price, the actual energy efficiency ratio of the heat pump system, and the actual temperature of the object affected by the heat pump system in real time. Among them, the energy efficiency ratio is the ratio of energy conversion efficiency. Set multiple sampling times, and the sampling intervals between adjacent sampling times are equal. Obtain the actual electricity price, the actual energy efficiency ratio of the heat pump system, and the actual temperature of the object affected by the heat pump system at each sampling time.

[0061] Among them, the actual electricity price can be obtained through the grid API (Application Programming Interface). The grid API is a technical interface in the power system for realizing data interaction and function integration between different systems. The heat pump system includes a heat pump controller, which is connected to various components in the heat pump system, such as compressors, energy storage modules, and various heat exchangers. The heat pump controller can calculate the actual energy efficiency ratio of the heat pump system in real time. Therefore, the actual energy efficiency ratio of the heat pump system can be obtained in real time through the heat pump controller. The object of the heat pump system can be the living area of users. At least one temperature sensor is set in the living area, and the average value of the temperature values obtained by each temperature sensor at the same moment is used as the actual temperature of the object of the heat pump system.

[0062] S120: Calculate the control ratio value according to at least two of the actual electricity price, the actual energy efficiency ratio of the heat pump system, and the actual temperature of the object of the heat pump system. Among them, when calculating the control ratio value, based on at least two of the actual electricity price, the actual energy efficiency ratio of the heat pump system, and the actual temperature of the object of the heat pump system at the same sampling moment, calculate the control ratio value at this sampling moment.

[0063] A constraint function can be established in advance based on the electricity price and the energy efficiency ratio of the heat pump system. Calculate the control ratio value according to the actual electricity price and the actual energy efficiency ratio of the heat pump system, so as to adjust the frequency of the compressor according to the control ratio value, and then determine the frequency of the compressor by integrating the dual objectives of electricity price and energy efficiency ratio. Or, establish a constraint function based on the energy efficiency ratio of the heat pump system and the temperature of the object of the heat pump system. Calculate the control ratio value according to the actual energy efficiency ratio of the heat pump system and the actual temperature of the object of the heat pump system, so as to adjust the frequency of the compressor according to the control ratio value, and then determine the frequency of the compressor by integrating the dual objectives of energy efficiency ratio and temperature. Or, establish a constraint function based on the electricity price and the temperature of the object of the heat pump system. Calculate the control ratio value according to the actual electricity price and the actual temperature of the object of the heat pump system, so as to adjust the frequency of the compressor according to the control ratio value, and then determine the frequency of the compressor by integrating the dual objectives of electricity price and temperature. Or, establish a constraint function based on the electricity price, the energy efficiency ratio of the heat pump system, and the temperature of the object of the heat pump system. Calculate the control ratio value according to the actual electricity price, the actual energy efficiency ratio of the heat pump system, and the actual temperature of the object of the heat pump system, so as to adjust the frequency of the compressor according to the control ratio value, and then determine the frequency of the compressor by integrating the triple objectives of electricity price, energy efficiency ratio, and temperature, so that the heat pump system takes into account cost, compressor energy efficiency ratio, and user comfort.

[0064] S130: Determine the actual frequency of the compressor according to the control ratio value and the target frequency corresponding to the current moment, and control the compressor to run at the actual frequency.

[0065] One moment corresponds to one target frequency, and the target frequencies corresponding to some moments can be the same. In an optional implementation manner, the target frequencies corresponding to different moments in the same electricity price stage are the same, and the target frequencies corresponding to different electricity price stages are different. The target frequency can be set in advance. The actual frequency of the compressor is determined according to the control ratio value and the target frequency corresponding to the current moment, so that the actual frequency of the compressor fluctuates up and down based on the target frequency considering at least two of the electricity price, the energy efficiency ratio, and the temperature, so as to meet the conditions of multi-objective constraints.

[0066] In the technical solution of the embodiment of the present invention, the actual electricity price, the actual energy efficiency ratio of the heat pump system, and the actual temperature of the object affected by the heat pump system are obtained in real time, and the control ratio value is calculated for at least two of the actual electricity price, the actual energy efficiency ratio of the heat pump system, and the actual temperature of the object affected by the heat pump system at any moment, and then the actual frequency of the compressor is determined according to the control ratio value. Determining the frequency of the compressor by integrating at least two of the electricity price, the temperature, and the energy efficiency ratio can balance at least two of the energy efficiency, the economy, and the user comfort, and solve the problem of multi-objective conflict in the control process of the heat pump system.

[0067] Optionally, a reward function is established based on the electricity price, the energy efficiency ratio of the heat pump system, and the temperature of the object affected by the heat pump system, so as to calculate the reward value at the current moment according to the actual electricity price, the actual energy efficiency ratio of the heat pump system, and the actual temperature of the object affected by the heat pump system at the current moment, and the reward value calculated based on the reward function is used as the control ratio value.

[0068] The reward function satisfies:

[0069]

[0070] R is the reward value, ω1 is the first weight, ω2 is the second weight, ω3 is the third weight, COP1 is the actual energy efficiency ratio of the heat pump system, COP0 is the reference energy efficiency ratio of the heat pump system, T1 is the actual temperature of the object affected by the heat pump system, T0 is the preset temperature of the object affected by the heat pump system, mo is the reference electricity price, and m1 is the actual electricity price.

[0071] COP0 is the reference energy efficiency ratio of the heat pump system, which can be the rated energy efficiency ratio of the heat pump system, generally set to 4.5. The reference electricity price can be the average value of the electricity price within a preset historical period, such as the average value of the electricity price from 0:00 to 24:00 in the historical 24 hours, generally set to 0.6 yuan / kWh. The preset temperature of the object affected by the heat pump system can be set according to user needs, such as set to 25°C.

[0072] For any moment, such as the first moment, substitute the actual electricity price, the actual energy efficiency ratio of the heat pump system, and the actual temperature of the object affected by the heat pump system into the reward function to calculate the reward value at the first moment, and use it as the control ratio value.

[0073] In an alternative embodiment, the first weight, the second weight, and the third weight can correspond to the same set of values for different moments to simplify the control logic. Or, in other embodiments, the first weight, the second weight, and the third weight can be adjusted in real time to balance energy efficiency, economy, and user comfort according to different requirements in real time.

[0074] Figure 2 The flowchart of another control method for a heat pump system provided by an embodiment of the present invention is shown in Figure 2 , and the control method includes:

[0075] S111: Obtain the actual electricity price, the actual energy efficiency ratio of the heat pump system, and the actual temperature of the object affected by the heat pump system.

[0076] S121: Determine the electricity price stage to which the current moment belongs; the electricity price stage includes at least a peak time stage, a valley time stage, and a normal time stage. In different electricity price stages, at least one of the first weight, the second weight, and the third weight is different. In different moments within the same electricity price stage, the first weight, the second weight, and the third weight remain unchanged. Among them, the electricity price corresponding to the peak time stage is greater than the electricity price corresponding to the normal time stage, and the electricity price corresponding to the normal time stage is greater than the electricity price corresponding to the valley time stage.

[0077] The peak time stage is the peak period of electricity consumption, with a large electricity consumption, which can include 10:00 - 12:00 and 14:00 - 19:00. The valley time stage is the low valley period of electricity consumption, with a small electricity consumption, which can include 0:00 - 8:00. The electricity consumption in the normal time stage is between the electricity consumption in the peak time stage and the electricity consumption in the valley time stage. The normal time stage includes 8:00 - 10:00, 12:00 - 14:00, and 19:00 - 24:00. In different moments within the same electricity price stage, the electricity price remains unchanged.

[0078] S131: Determine the first weight, the second weight, and the third weight according to the electricity price stage to which the current moment belongs and the preset corresponding relationship; the preset corresponding relationship is the corresponding relationship between the electricity price stage and the first weight, the second weight, and the third weight.

[0079] In an alternative embodiment, the preset corresponding relationship satisfies:

[0080] Peak time stage: ω1 = 0.2, ω2 = 0.5, ω3 = 0.3;

[0081] Normal time stage: ω1 = 0.25, ω2 = 0.25, ω3 = 0.5;

[0082] Valley time stage: ω1 = 0.2, ω2 = 0.3, ω3 = 0.5.

[0083] The second weight ω2 in the peak time stage is greater than the first weight ω1 in the peak time stage and greater than the third weight ω3 in the peak time stage;

[0084] The third weight ω3 in the valley time stage is greater than the first weight ω1 in the valley time stage and greater than the second weight ω2 in the valley time stage;

[0085] The third weight ω3 in the normal time stage is greater than the first weight ω1 in the normal time stage and greater than the second weight ω2 in the normal time stage.

[0086] The second weight ω2 corresponding to the peak time stage is greater than the second weight ω2 corresponding to the normal time stage and greater than the second weight ω2 corresponding to the valley time stage. During the peak electricity price period, with cost as the main goal, the proportion of the electricity price factor is the largest, and cost reduction is given priority.

[0087] The third weight ω3 corresponding to the valley time stage is greater than the third weight ω3 corresponding to the peak time stage, and the third weight ω3 corresponding to the normal time stage is greater than the third weight ω3 corresponding to the peak time stage. During the low electricity consumption period, with user comfort as the main goal, the temperature accounts for the largest proportion, and improving user comfort is given priority.

[0088] Or, in other embodiments, in the normal time stage, both the first weight ω1 and the third weight ω3 are greater than the second weight ω2, and in the valley time stage, both the first weight ω1 and the third weight ω3 are greater than the second weight ω2. That is, in the normal time stage and the valley time stage, the first weight ω1 and the third weight ω3 are dominant, and the energy efficiency ratio and user comfort are given priority.

[0089] S141: Calculate the reward value and use it as the control ratio value according to the first weight, the second weight, the third weight, the actual electricity price, the actual energy efficiency ratio of the heat pump system, the actual temperature of the object affected by the heat pump system, and the reward function.

[0090] Substitute the first weight, the second weight, the third weight, the actual electricity price, the actual energy efficiency ratio of the heat pump system, and the actual temperature of the object affected by the heat pump system at the current moment into the reward function, and use the obtained value as the control ratio value at the current moment.

[0091] S151: Determine the actual frequency of the compressor according to the control ratio value and the target frequency corresponding to the current moment, and control the compressor to run at the actual frequency.

[0092] Step S151 can specifically correspond to two control strategies, Scheme 1:

[0093] Use the first frequency value obtained from the compressor frequency calculation function as the actual frequency of the compressor;

[0094] Among them, the compressor frequency calculation function satisfies:

[0095] P0 = R1·P1; where, R1 is the control ratio value, P1 is the target frequency corresponding to the current moment, and P0 is the first frequency value.

[0096] That is, the product of the reward value at the current moment and the target frequency is used as the actual frequency of the compressor at the current moment, and the compressor is controlled to operate at the above actual frequency.

[0097] Solution two:

[0098] Obtain the first frequency value of the compressor based on the compressor frequency calculation function;

[0099] When the first frequency value of the compressor is greater than or equal to the first set threshold and less than or equal to the second set threshold, the first frequency value is used as the actual frequency of the compressor. The first set threshold is the minimum frequency value that the compressor can operate at, such as 40 Hz, and the second set threshold is the maximum frequency value that the compressor can operate at, such as 100 Hz. The first set threshold is less than the second set threshold. When the first frequency value of the compressor at the current moment is greater than or equal to the first set threshold and less than or equal to the second set threshold, the first frequency value is used as the actual frequency of the compressor at the current moment.

[0100] When the first frequency value of the compressor is greater than the second set threshold, the second set threshold is used as the actual frequency of the compressor. When the first frequency value of the compressor at the current moment is greater than the second set threshold, the second set threshold is used as the actual frequency of the compressor at the current moment.

[0101] When the first frequency value of the compressor is less than the first set threshold, the first set threshold is used as the actual frequency of the compressor. When the first frequency value of the compressor at the current moment is less than the first set threshold, the first set threshold is used as the actual frequency of the compressor at the current moment.

[0102] Set the upper limit value and lower limit value of the compressor frequency, so that when the comprehensive temperature, energy efficiency ratio, and electricity price regulate the actual frequency of the compressor, the compressor can operate in a stable state and ensure the reliability of the compressor operation.

[0103] In this embodiment, a specific calculation example for calculating the actual frequency of the compressor is provided for different electricity price stages, and the above solution two is taken as an example when calculating the actual frequency of the compressor. In this embodiment, the electricity price during the peak period is 1 yuan / kWh, the electricity price during the valley period is 0.3 yuan / kWh, the electricity price during the normal period is 0.6 yuan / kWh, the preset temperature T0 of the object of the heat pump system is 25 °C, the reference electricity price m0 is 0.6 yuan / kWh, the reference energy efficiency ratio COP0 of the heat pump system is 4.5, and the preset correspondence relationship is satisfied as follows:

[0104] Peak time stage: ω1 = 0.2, ω2 = 0.5, ω3 = 0.3;

[0105] Normal time stage: ω1 = 0.25, ω2 = 0.25, ω3 = 0.5;

[0106] Valley time stage: ω1 = 0.2, ω2 = 0.3, ω3 = 0.5.

[0107] In the peak time stage, taking the first moment t11 in the peak time stage, such as 10:30, as an example. At the first moment t11, the actual voltage m1 = 1 yuan / kWh, the actual coefficient of performance COP1 of the heat pump system = 4.5 (the ambient temperature at 10:30 is relatively mild), the actual temperature T1 of the object on which the heat pump system acts = 25°C (the ambient temperature at 10:30 is relatively mild). At this time:

[0108]

[0109] The first frequency value P0 at the first moment t11 = P1 * R = 60 * 0.8 = 48Hz. The target frequency of the compressor set in the peak time stage is 60Hz, but due to the increase in electricity price in the peak time stage, the actual operating frequency is reduced to 48Hz to save costs.

[0110] In the normal time stage, taking the second moment t22 in the normal time stage, such as 8:30, as an example. At the second moment t22, the actual voltage m1 = 0.6 yuan / kWh, the actual coefficient of performance COP1 of the heat pump system = 4.3 (the ambient temperature at 8:30 is relatively low), the actual temperature T1 of the object on which the heat pump system acts = 24°C (the ambient temperature at 8:30 is relatively low). The target frequency P1 in the normal time stage = 70Hz. At this time:

[0111]

[0112] The first frequency value P0 at the second moment t22 = P1 * R = 70 * 1 = 70Hz. Due to the combined effect of the actual energy efficiency and temperature deviation, the value of R is 1, and it operates according to the target set frequency of 70Hz.

[0113] In the valley time stage, taking the third moment t33 in the valley time stage (such as 3:00) as an example. At the third moment t33, the actual coefficient of performance COP1 of the heat pump system = 4.0 (the ambient temperature at 3:00 is low), the actual temperature T1 of the object on which the heat pump system acts = 23°C (the ambient temperature at 3:00 is low). The target frequency P1 of the compressor in the valley time stage = 80Hz. The reward value at the third moment t33:

[0114]

[0115] The actual frequency P0 of the compressor = P1 * R = 80 * 1.29 = 103 Hz, and the second set threshold is equal to 100 Hz. Therefore, the compressor can only operate at 100 Hz. Although the energy efficiency is low, due to the relatively low electricity price and the large temperature deviation, the comprehensive impact on the reward value makes the reward value large, and the actual operating frequency increases to 100 Hz.

[0116] Figure 3 It is a flowchart of another control method for a heat pump system provided by an embodiment of the present invention. Refer to Figure 3 , the heat pump system further includes an energy storage module connected to the compressor;

[0117] S112: Determine the electricity price stage to which the current moment belongs.

[0118] S122: Obtain the actual electricity price, the actual energy efficiency ratio of the heat pump system, and the actual temperature of the object affected by the heat pump system.

[0119] S132: Calculate the control ratio value according to at least two of the actual electricity price, the actual energy efficiency ratio of the heat pump system, and the actual temperature of the object affected by the heat pump system.

[0120] S142: Determine the actual frequency of the compressor according to the control ratio value and the target frequency corresponding to the current moment, and control the compressor to operate at the actual frequency.

[0121] S152: When the electricity price stage to which the current moment belongs is the peak time stage, control the energy storage module to output energy.

[0122] S162: When the electricity price stage to which the current moment belongs is the valley time stage or the normal time stage, and the actual temperature of the object affected by the heat pump system reaches the preset temperature of the object affected by the heat pump system, control the energy storage module to store energy.

[0123] In this embodiment, during the valley time stage, the energy storage module is used for energy storage. During the peak time stage, the compressor can be turned off, and only the energy storage module is used for cooling or heating, dynamically adjusting the energy distribution.

[0124] Optionally, when the electricity price stage to which the current moment belongs is the peak time stage and the actual temperature of the object affected by the heat pump system reaches the set temperature, control the compressor to stop operating or control the compressor to operate at the actual frequency as the first set threshold, and control the energy storage module to output energy; when the electricity price stage to which the current moment belongs is the valley time stage, control the compressor to operate at the actual frequency as the second set threshold, and control the energy storage module to store energy. When the electricity price stage to which the current moment belongs is the normal time stage, determine the actual frequency of the compressor according to the control ratio value and the target frequency, and control the compressor to operate at the actual frequency.

[0125] Figure 4The structural schematic diagram of a control device for a heat pump system provided by an embodiment of the present invention. The heat pump system includes a compressor, as Figure 4 shown. The device includes:

[0126] An acquisition module 10, configured to acquire the actual electricity price, the actual energy efficiency ratio of the heat pump system, and the actual temperature of the object affected by the heat pump system;

[0127] A calculation module 11, configured to calculate a control ratio value according to at least two of the actual electricity price, the actual energy efficiency ratio of the heat pump system, and the actual temperature of the object affected by the heat pump system;

[0128] A control module 12, configured to determine the actual frequency of the compressor according to the control ratio value and the target frequency corresponding to the current moment, and control the compressor to operate at the actual frequency.

[0129] The beneficial effects of the control device of the heat pump system are the same as those of the control method of the heat pump system, and will not be elaborated here.

[0130] The control device of the heat pump system provided by the embodiment of the present invention can execute the control method of the heat pump system provided by any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0131] Figure 5 The structural schematic diagram of a heat pump system provided by an embodiment of the present invention. Refer to Figure 5 , the heat pump system includes: a compressor 1, a first heat exchanger 2, a second heat exchanger 3, an energy storage module 4, a four-way valve 5, and a temperature sensor 6. The output end U0 of the compressor 1 is connected to the input end of the four-way valve 5. The first end of the first heat exchanger 2 is connected to the first end A1 of the four-way valve 5. The second end of the first heat exchanger 2 is connected to the first end of the second heat exchanger 3. The second end of the second heat exchanger 3 is connected to the second end A2 of the four-way valve 5. The first end and the second end of the second heat exchanger 3 are communicated. The input end I0 of the compressor 1 is connected to the third end A3 of the four-way valve 5. The energy storage module 4 is respectively connected to both ends of the second heat exchanger 3. The user end 7, that is, the object affected by the heat pump system, is respectively connected to both ends of the second heat exchanger 3.

[0132] Taking the heating of the heat pump system as an example, the gas output from the output end U0 of the compressor 1 enters the first heat exchanger 2 through the four-way valve 5 for heat exchange, then enters the second heat exchanger 3, exchanges heat with the user end 7, and thus realizes the heating of the user end 7. The gas output from the second heat exchanger 3 enters the input end I0 of the compressor 1 through the four-way valve 5.

[0133] It should be understood that the various forms of processes shown above can be used, with steps reordered, added or deleted. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and no limitation is made herein.

[0134] The above specific embodiments do not constitute a limitation on the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A control method for a heat pump system, characterized in that, The heat pump system includes a compressor; The control method of the heat pump system includes: Obtaining the actual electricity price, the actual energy efficiency ratio of the heat pump system, and the actual temperature of the object affected by the heat pump system; Calculating a control ratio value according to at least two of the actual electricity price, the actual energy efficiency ratio of the heat pump system, and the actual temperature of the object affected by the heat pump system; Determining the actual frequency of the compressor according to the control ratio value and the target frequency corresponding to the current moment, and controlling the compressor to operate at the actual frequency.

2. The control method of the heat pump system according to claim 1, characterized in that, The calculating the control ratio value according to at least two of the actual electricity price, the actual energy efficiency ratio of the heat pump system, and the actual temperature of the object affected by the heat pump system includes: Calculating the control ratio value according to the actual electricity price, the actual energy efficiency ratio of the heat pump system, and the actual temperature of the object affected by the heat pump system.

3. The control method of the heat pump system according to claim 2, characterized in that, Taking the reward value calculated based on the reward function as the control ratio value; Wherein, the reward function satisfies: R is the reward value, ω1 is the first weight, ω2 is the second weight, ω3 is the third weight, COP1 is the actual energy efficiency ratio of the heat pump system, COP0 is the reference energy efficiency ratio of the heat pump system, T1 is the actual temperature of the object affected by the heat pump system, T0 is the preset temperature of the object affected by the heat pump system, mo is the reference electricity price, and m1 is the actual electricity price.

4. The control method of the heat pump system according to claim 3, characterized in that The calculating the control ratio value according to the actual electricity price, the actual energy efficiency ratio of the heat pump system, and the actual temperature of the object affected by the heat pump system includes: Determining the electricity price stage to which the current moment belongs; the electricity price stage at least includes a peak time stage, a valley time stage, and a normal time stage, and at least one of the first weight, the second weight, and the third weight is different in different electricity price stages; Determining the first weight, the second weight, and the third weight according to the electricity price stage to which the current moment belongs and a preset corresponding relationship; the preset corresponding relationship is the corresponding relationship between the electricity price stage and the first weight, the second weight, and the third weight; Calculating the reward value according to the first weight, the second weight, the third weight, the actual electricity price, the actual energy efficiency ratio of the heat pump system, the actual temperature of the object affected by the heat pump system, and the reward function, and taking it as the control ratio value.

5. The control method of the heat pump system according to claim 4, characterized in that, The second weight in the peak time stage is greater than the first weight in the peak time stage and greater than the third weight in the peak time stage; The third weight in the valley time stage is greater than the first weight in the valley time stage and greater than the second weight in the valley time stage; The third weight in the normal time stage is greater than the first weight in the normal time stage and greater than the second weight in the normal time stage.

6. The control method of the heat pump system according to claim 1, characterized in that The determining the actual frequency of the compressor according to the control ratio value and the target frequency corresponding to the current moment includes: Taking the first frequency value obtained based on the compressor frequency calculation function as the actual frequency of the compressor; Wherein, the compressor frequency calculation function satisfies: P0 = R1·P1; where R1 is the control ratio value, P1 is the target frequency corresponding to the current moment, and P0 is the first frequency value.

7. The control method of the heat pump system according to claim 1, characterized in that Determining the actual frequency of the compressor according to the control ratio value and the target frequency corresponding to the current moment includes: Obtaining a first frequency value of the compressor based on a compressor frequency calculation function; When the first frequency value of the compressor is greater than or equal to a first set threshold and less than or equal to a second set threshold, using the first frequency value as the actual frequency of the compressor; When the first frequency value of the compressor is greater than the second set threshold, using the second set threshold as the actual frequency of the compressor; When the first frequency value of the compressor is less than the first set threshold, using the first set threshold as the actual frequency of the compressor; Wherein, the compressor frequency calculation function satisfies: P0 = R1·P1; where R1 is the control ratio value, P1 is the target frequency corresponding to the current moment, and P0 is the first frequency value.

8. The control method of the heat pump system according to claim 1, characterized in that, The heat pump system further includes an energy storage module connected to the compressor; The control method of the heat pump system further includes: Determining the electricity price stage to which the current moment belongs; the electricity price stage at least includes a peak time stage, a valley time stage, and a normal time stage; When the electricity price stage to which the current moment belongs is the valley time stage or the normal time stage, and the actual temperature of the object on which the heat pump system acts reaches the preset temperature of the object on which the heat pump system acts, controlling the energy storage module to store energy.

9. The control method of the heat pump system according to claim 1, wherein The heat pump system further includes an energy storage module connected to the compressor; The control method of the heat pump system further includes: Determining the electricity price stage to which the current moment belongs; the electricity price stage at least includes a peak time stage, a valley time stage, and a normal time stage; When the electricity price stage to which the current moment belongs is the peak time stage, controlling the energy storage module to output energy.

10. A control device for a heat pump system, characterized in that, The heat pump system includes a compressor; The control device of the heat pump system includes: An acquisition module, configured to acquire the actual electricity price, the actual energy efficiency ratio of the heat pump system, and the actual temperature of the object on which the heat pump system acts; A calculation module, configured to calculate a control ratio value according to at least two of the actual electricity price, the actual energy efficiency ratio of the heat pump system, and the actual temperature of the object on which the heat pump system acts; A control module, configured to determine the actual frequency of the compressor according to the control ratio value and the target frequency corresponding to the current moment, and control the compressor to operate at the actual frequency.

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