A control method and device of an energy storage system, a household appliance and a storage medium

Abstract

The application discloses a control method and device of an energy storage system, a household appliance and a storage medium. The method comprises the following steps: determining a static heat exchange amount based on a material temperature of an energy storage material, an ambient temperature of an environment in which a second heat exchanger is located and a power of a compressor; determining a dynamic heat exchange amount based on the material temperature of the energy storage material, the ambient temperature, the power of the compressor and a first rotating speed of a circulating pump; determining a target rotating speed of the circulating pump based on the static heat exchange amount, the dynamic heat exchange amount, a power of the circulating pump and the power of the compressor, and controlling the circulating pump based on the target rotating speed. In this way, since the static heat exchange amount and the dynamic heat exchange amount can represent heat exchange amounts in the circulating pump circulation mode and the non-circulating pump circulation mode respectively, and the circulating pump power and the compressor power can be used to determine the energy conversion efficiency, the rotating speed of the circulating pump can be controlled according to the static heat exchange amount, the dynamic heat exchange amount, the circulating pump power and the compressor power, so that the energy can be saved while the heat exchange demand is ensured, and the energy-saving control of the circulating pump is realized.

Description

Technical Field

[0001] This invention relates to the field of household appliance control technology, and in particular to a control method, device, household appliance, and storage medium for an energy storage system. Background Technology

[0002] In conventional energy storage devices that rely on fluids as energy storage materials, the energy storage material is statically heated during energy storage or release. This means the material remains stationary while the flowing heating fluid provides the energy. However, static heating can lead to significant temperature differences between different locations within the energy storage material and inconsistent heat exchange between the upper and lower surfaces. Current technologies address this by adding a circulation pump to the energy storage device. By circulating the energy storage material in a counter-current manner to the heating fluid, the heat exchange efficiency is enhanced, effectively reducing temperature differences and shortening storage and release times. However, current technology typically only controls the circulation pump to shut it off when the device is off and turn it on during storage and release. It lacks deeper energy-saving control, resulting in poor energy efficiency and energy waste. Summary of the Invention

[0003] To address the aforementioned technical problems, embodiments of this application aim to provide a control method, apparatus, household appliance, and storage medium for an energy storage system.

[0004] The technical solution of this application is implemented as follows:

[0005] In a first aspect, a control method for an energy storage system is provided, which is applied to the energy storage system, the energy storage system comprising: an energy storage device, a second heat exchanger, a compressor, a four-way valve and a circulating pump; wherein, the energy storage device is provided with a first heat exchanger and an energy storage material, and the circulating pump is used to drive the energy storage material to circulate;

[0006] The method includes:

[0007] The static heat exchange capacity is determined based on the material temperature of the energy storage material, the ambient temperature of the environment where the second heat exchanger is located, and the power of the compressor.

[0008] The dynamic heat exchange is determined based on the material temperature of the energy storage material, the ambient temperature, the power of the compressor, and the first rotational speed of the circulating pump.

[0009] Based on the static heat exchange, the dynamic heat exchange, the power of the circulating pump, and the power of the compressor, the target speed of the circulating pump is determined, and the circulating pump is controlled based on the target speed.

[0010] In the above scheme, determining the target speed of the circulating pump based on the static heat exchange, the dynamic heat exchange, the power of the circulating pump, and the power of the compressor includes: determining the static energy efficiency value based on the static heat exchange and the power of the compressor; determining the dynamic energy efficiency value based on the dynamic heat exchange, the power of the compressor, and the power of the circulating pump; and determining the target speed of the circulating pump based on the static energy efficiency value, the dynamic energy efficiency value, the upper limit of energy efficiency control, and the lower limit of energy efficiency control.

[0011] In the above scheme, determining the target speed of the circulating pump based on the static energy efficiency value, the dynamic energy efficiency value, the upper limit of energy efficiency value control, and the lower limit of energy efficiency value control includes: determining that the target speed is not 0 when the dynamic energy efficiency value is greater than the sum of the static energy efficiency value and the upper limit of energy efficiency value control, and the duration of the difference exceeds a third preset duration.

[0012] In the above scheme, determining the target speed of the circulating pump based on the static energy efficiency value, the dynamic energy efficiency value, the upper limit of energy efficiency value control, and the lower limit of energy efficiency value control includes: determining that the target speed is 0 when the dynamic energy efficiency value is less than the difference between the static energy efficiency value and the lower limit of energy efficiency value control, and the operating speed of the circulating pump is within a preset speed range for more than a fourth preset time.

[0013] In the above scheme, determining the target speed of the circulating pump based on the static energy efficiency value, the dynamic energy efficiency value, the upper limit of energy efficiency value control, and the lower limit of energy efficiency value control further includes: when the dynamic energy efficiency value is greater than the sum of the static energy efficiency value and the upper limit of energy efficiency value control, increasing the operating speed according to the PID proportional adjustment to obtain the target speed, so that the dynamic energy efficiency value is less than or equal to the sum of the static energy efficiency value and the upper limit of energy efficiency value control, and greater than or equal to the difference between the static energy efficiency value and the lower limit of energy efficiency value control.

[0014] In the above scheme, determining the target speed of the circulating pump based on the static energy efficiency value, the dynamic energy efficiency value, the upper limit of energy efficiency value control, and the lower limit of energy efficiency value control further includes: when the dynamic energy efficiency value is less than the difference between the static energy efficiency value and the lower limit of energy efficiency value control, adjusting the operating speed according to the PID proportional control to obtain the target speed, so that the dynamic energy efficiency value is less than or equal to the sum of the static energy efficiency value and the upper limit of energy efficiency value control, and greater than or equal to the difference between the static energy efficiency value and the lower limit of energy efficiency value control.

[0015] In the above scheme, determining the target speed of the circulating pump based on the static heat exchange, the dynamic heat exchange, the power of the circulating pump, and the power of the compressor includes: calculating the difference between the dynamic heat exchange and the static heat exchange, and the ratio of the static heat exchange to the power of the real-time compressor; calculating the product of the difference and the ratio to obtain a first parameter; determining that the power of the circulating pump is greater than or equal to the first parameter and the duration exceeds a first preset duration, and determining that the target speed is 0; determining that the power of the circulating pump is less than or equal to the first parameter and the duration exceeds a second preset duration, and determining that the target speed is not 0.

[0016] Secondly, a control device for an energy storage system is provided, which is applied to the energy storage system, the energy storage system including: an energy storage device, a second heat exchanger, a compressor, a four-way valve and a circulating pump; wherein, the energy storage device is provided with a first heat exchanger and energy storage material, and the circulating pump is used to drive the energy storage material to circulate;

[0017] The device includes:

[0018] The processing module is used to determine the static heat exchange capacity based on the material temperature of the energy storage material, the ambient temperature of the environment where the second heat exchanger is located, and the power of the compressor; and to determine the dynamic heat exchange capacity based on the material temperature of the energy storage material, the ambient temperature, the power of the compressor, and the first rotational speed of the circulating pump.

[0019] The control module is used to determine the target speed of the circulating pump based on the static heat exchange, the dynamic heat exchange, the power of the circulating pump, and the power of the compressor, and to control the circulating pump based on the target speed.

[0020] Thirdly, a household appliance is provided, the household appliance comprising: a processor and a memory configured to store a computer program capable of running on the processor, wherein the processor is configured to perform the steps of the aforementioned method when running the computer program.

[0021] Fourthly, a computer storage medium is provided that stores a computer program thereon, wherein the computer program, when executed by a processor, implements the steps of the aforementioned method.

[0022] This application discloses a control method, device, household appliance, and storage medium for an energy storage system. Since static heat exchange can characterize the heat exchange in a circulation mode without a circulation pump and dynamic heat exchange can characterize the heat exchange in a circulation mode with a circulation pump, and the power of the circulation pump and the power of the compressor can be used to determine the energy conversion efficiency, by controlling the speed of the circulation pump according to the static heat exchange, dynamic heat exchange, and the power of the circulation pump and the power of the compressor, energy can be saved while ensuring the heat exchange requirements, thus achieving energy-saving control of the circulation pump. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the energy storage system in an embodiment of this application;

[0024] Figure 2 This is a first flowchart illustrating the control method of the energy storage system in the embodiments of this application;

[0025] Figure 3 This is a second flowchart illustrating the control method of the energy storage system in the embodiments of this application;

[0026] Figure 4 This is a schematic diagram of the third process of the control method for the energy storage system in the embodiments of this application;

[0027] Figure 5 This is a schematic diagram of the composition of the control device of the energy storage system in the embodiments of this application;

[0028] Figure 6 This is a schematic diagram of the composition of household appliances in the embodiments of this application. Detailed Implementation

[0029] In order to gain a more detailed understanding of the features and technical content of the embodiments of this application, the implementation of the embodiments of this application will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for reference and illustration only and are not intended to limit the embodiments of this application.

[0030] This application proposes a control method for an energy storage system, which is applied to the energy storage system. The energy storage system includes: an energy storage device, a second heat exchanger, a compressor, a four-way valve, and a circulating pump; wherein the energy storage device contains a first heat exchanger and energy storage material, and the circulating pump drives the energy storage material to circulate.

[0031] Here, a circulation pump is used to drive the liquid energy storage material in the energy storage device to circulate. The liquid energy storage material in the energy storage device can be water and aqueous solutions, as well as some composite material solutions. For example, in some embodiments, the energy storage device is the water tank of a water heater.

[0032] For example, in some embodiments, the energy storage system further includes a throttling device and a fan placed adjacent to the second heat exchanger.

[0033] Figure 1 This is a schematic diagram of the energy storage system in an embodiment of this application. Figure 1 As shown, the energy storage system includes: an energy storage device 100, a second heat exchanger 102, a compressor 103, a four-way valve 104, a circulating pump 105, a throttling device 106, and a fan 107; wherein, the energy storage device is provided with a first heat exchanger 101 and energy storage material 108; the circulating pump 105 is used to drive the energy storage material 108 in the energy storage device 100 to circulate.

[0034] For example, in some embodiments, the second heat exchanger is an outdoor heat exchanger, and the fan is an outdoor fan. The first heat exchanger stores or releases energy from the energy storage material in the energy storage device by exchanging heat with the energy storage device.

[0035] Figure 2 This is a first flowchart illustrating the control method of the energy storage system in an embodiment of this application, as shown below. Figure 2 As shown, the control method for this energy storage system may specifically include:

[0036] Step 201: Determine the static heat exchange capacity based on the material temperature of the energy storage material, the ambient temperature of the environment where the second heat exchanger is located, and the power of the compressor.

[0037] Here, the material temperature of the energy storage material and the ambient temperature of the second heat exchanger can be obtained from a temperature sensor. Here, the compressor power is the real-time consumed compressor power, which can be calculated based on the measured voltage and current of the electronic control unit.

[0038] Static heat transfer characterizes the heat transfer without circulation by a circulating pump. For example, in some embodiments, static heat transfer = first heat transfer of the evaporator + compressor power, wherein the first heat transfer of the evaporator can be obtained by substituting the current temperature of the energy storage material and the current ambient temperature of the environment where the second heat exchanger is located into the first heat transfer function of the evaporator. Here, the first heat transfer function of the evaporator is a function related to the temperature of the energy storage material and the ambient temperature of the environment where the second heat exchanger is located, obtained from actual testing.

[0039] For example, in some embodiments, determining the static heat exchange capacity based on the material temperature of the energy storage material, the ambient temperature of the environment where the second heat exchanger is located, and the power of the compressor includes: obtaining the first heat exchange capacity of the second heat exchanger based on the material temperature of the energy storage material and the ambient temperature of the environment where the second heat exchanger is located; and calculating the sum of the first heat exchange capacity and the power of the compressor to obtain the static heat exchange capacity.

[0040] Step 202: Determine the dynamic heat exchange based on the material temperature of the energy storage material, the ambient temperature, the power of the compressor, and the first rotation speed of the circulating pump.

[0041] Dynamic heat exchange characterizes the heat exchange under the circulation of the pump. For example, in some embodiments, dynamic heat exchange = evaporator second heat exchange + compressor power, wherein the evaporator second heat exchange can be obtained by substituting the current energy storage material temperature, the current ambient temperature of the environment where the second heat exchanger is located, and the first rotational speed of the circulation pump into the evaporator second heat exchange function. Here, the evaporator second heat exchange function is based on a function related to the energy storage material temperature, the ambient temperature of the environment where the second heat exchanger is located, and the rotational speed of the circulation pump obtained from actual tests.

[0042] For example, in some embodiments, determining the dynamic heat exchange based on the material temperature of the energy storage material, the ambient temperature, the power of the compressor, and the first rotational speed of the circulating pump includes: obtaining the second heat exchange of the second heat exchanger based on the material temperature of the energy storage material, the ambient temperature of the environment where the second heat exchanger is located, and the first rotational speed of the circulating pump; and calculating the sum of the second heat exchange and the power of the compressor to obtain the dynamic heat exchange.

[0043] For example, in practical applications, if the current operating speed of the circulating pump is not 0, the first speed is the operating speed of the circulating pump when determining the dynamic heat exchange. For example, in practical applications, if the current operating speed of the circulating pump is 0, the first speed is the minimum speed of the circulating pump (the minimum value in the range of circulating pump speeds) when determining the dynamic heat exchange.

[0044] In some embodiments, determining the dynamic heat exchange based on the material temperature of the energy storage material, the ambient temperature, the power of the compressor, and the first rotational speed of the circulating pump includes: determining the dynamic heat exchange based on the material temperature of the energy storage material, the ambient temperature, the power of the compressor, and the rotational speed of the circulating pump when the operating speed is not 0.

[0045] In some embodiments, determining the dynamic heat exchange based on the material temperature of the energy storage material, the ambient temperature, the power of the compressor, and the first rotational speed of the circulating pump includes: determining the dynamic heat exchange based on the material temperature of the energy storage material, the ambient temperature, the power of the compressor, and the minimum rotational speed of the circulating pump when the operating speed is 0.

[0046] Here, the minimum speed of the circulating pump is the minimum value in the range of circulating pump speeds.

[0047] Step 203: Based on the static heat exchange, dynamic heat exchange, power of the circulating pump, and power of the compressor, determine the target speed of the circulating pump, and control the circulating pump based on the target speed.

[0048] Here, controlling the circulating pump based on the target speed can adjust the operating speed of the circulating pump to the target speed.

[0049] Static heat exchange capacity represents the heat exchange without circulation by a circulating pump under the current operating condition, while static heat exchange capacity represents the heat exchange with circulation by a circulating pump under the current operating condition.

[0050] For example, in some embodiments, determining the target speed of the circulating pump based on the static heat exchange, dynamic heat exchange, power of the circulating pump, and power of the compressor includes: calculating the difference between the dynamic heat exchange and the static heat exchange, and the ratio of the static heat exchange to the real-time power of the compressor; calculating the product of the difference and the ratio to obtain a first parameter; determining that the power of the circulating pump is greater than or equal to the first parameter and the duration exceeds a first preset duration, and determining that the target speed is 0; determining that the power of the circulating pump is less than or equal to the first parameter and the duration exceeds a second preset duration, and determining that the target speed is not 0.

[0051] Here, the first preset duration can be the duration of anti-fluctuation. For example, in practical applications, the first preset duration ranges from 0 to 600 seconds.

[0052] For example, in some embodiments, the target speed of the circulating pump is determined based on the static heat exchange, dynamic heat exchange, power of the circulating pump, and power of the compressor, and the circulating pump is controlled based on the target speed, including: if P1≥(Q2-Q1)×(Q1÷P2) duration T, the target speed is determined to be 0, and the state of the circulating pump is changed to 0; if P1≤(Q2-Q1)×(Q1÷P2) duration T, the target speed is determined to be not 0, and the state of the circulating pump is changed to 1.

[0053] Wherein, P1 is the power of the circulating pump, which is generally a fixed value; Q1 and Q2 are the static heat exchange and dynamic heat exchange, respectively; P2 is the power of the compressor, which can be calculated based on the measured voltage and current of the electronic control unit; T is the anti-fluctuation duration, and for example, in some embodiments, T ranges from 0 to 600 seconds.

[0054] Here, changing the circulation pump status to 0 means changing the circulation pump's speed to 0. For example, in practical applications, this can be achieved by turning off the circulation pump. Conversely, changing the circulation pump status to 1 means changing the circulation pump's speed to a non-zero state. For example, in practical applications, this can be achieved by turning the circulation pump on.

[0055] For example, in some embodiments, after changing the state of the circulating pump to a state where the speed is not 0, controlling the circulating pump based on the target speed includes: controlling the circulating pump to run at a preset speed.

[0056] For example, in some embodiments, determining the target speed of the circulating pump based on the static heat exchange, dynamic heat exchange, power of the circulating pump, and power of the compressor includes: determining the static energy efficiency value based on the static heat exchange and power of the compressor; determining the dynamic energy efficiency value based on the dynamic heat exchange, power of the compressor, and power of the circulating pump; and determining the target speed of the circulating pump based on the static energy efficiency value, dynamic energy efficiency value, upper limit of energy efficiency control, and lower limit of energy efficiency control.

[0057] Here, the static energy efficiency value represents the real-time energy efficiency value under circulation conditions without a circulating pump; the dynamic energy efficiency value represents the real-time energy efficiency value under circulation conditions with a circulating pump. The upper limit of the energy efficiency value control is the upper limit of the preset energy efficiency value control range, with a value between 0 and 1; the lower limit of the energy efficiency value control is the lower limit of the preset energy efficiency value control range, with a value between 0 and 1. In practical applications, the upper and lower limits of the energy efficiency value control can be adjusted according to actual energy efficiency requirements.

[0058] For example, in some embodiments, determining the static energy efficiency value based on the static heat exchange and the compressor power includes: calculating the ratio of the static heat exchange to the compressor power to obtain the static energy efficiency value. For example, in some embodiments, determining the dynamic energy efficiency value based on the dynamic heat exchange, the compressor power, and the circulating pump power includes: calculating the ratio of the dynamic heat exchange to the sum of the compressor power and the circulating pump power to obtain the dynamic energy efficiency value.

[0059] This can be expressed as a formula:

[0060] Static energy efficiency value COP1 = Q1 ÷ P2; Dynamic energy efficiency value COP2 = Q2 ÷ (P2 + P1).

[0061] Where Q1 and Q2 are static heat exchange and dynamic heat exchange, respectively; P1 is the power of the circulating pump, and P2 is the power of the compressor consumed in real time.

[0062] For example, in some embodiments, the target speed of the circulating pump is determined based on the static energy efficiency value, the dynamic energy efficiency value, the upper limit of energy efficiency value control, and the lower limit of energy efficiency value control, including: determining that the target speed is not 0 when the dynamic energy efficiency value is greater than the sum of the static energy efficiency value and the upper limit of energy efficiency value control, and the duration of the difference exceeds a third preset duration.

[0063] For example, in some embodiments, determining the target speed of the circulating pump based on the static energy efficiency value, the dynamic energy efficiency value, the upper limit of energy efficiency value control, and the lower limit of energy efficiency value control includes: determining that the target speed is 0 when the dynamic energy efficiency value is less than the difference between the static energy efficiency value and the lower limit of energy efficiency value control, and the operating speed of the circulating pump is within a preset speed range for more than a fourth preset time.

[0064] Here, the third preset duration and the fourth preset duration can be the anti-fluctuation duration. For example, in actual applications, the value range of the anti-fluctuation duration can be 0 to 600 seconds.

[0065] Here, determining that the target rotational speed is not 0 means determining that the circulating pump shaft has changed to a rotating state. Determining that the target rotational speed is 0 means determining that the circulating pump shaft has changed to a stationary state. In practical applications, the state of the circulating pump can be changed to a state with a rotational speed of 0 by turning off the circulating pump; the state of the circulating pump can be changed to a state with a rotational speed of not 0 by turning on the circulating pump.

[0066] For example, in some embodiments, the target speed of the circulating pump is determined based on the static energy efficiency value, the dynamic energy efficiency value, the upper limit of energy efficiency value control, and the lower limit of energy efficiency value control, and the circulating pump is controlled based on the target speed, including: if COP2 > COP1 + A duration T, the target speed is determined to be not 0, and the state of the circulating pump is changed to 1; if COP2 < COP1 - B and the running speed of the circulating pump is min duration T, the target speed is determined to be 0, and the state of the circulating pump is changed to 0.

[0067] Wherein, COP1 and COP2 are the static energy efficiency value and the dynamic energy efficiency value, respectively; A is the upper limit of energy efficiency value control, which can be in the range of 0 to 1; B is the lower limit of energy efficiency value control, which can be in the range of 0 to 1.

[0068] Here, changing the circulation pump status to 0 means changing the circulation pump status to a state where the speed is 0. Changing the circulation pump status to 1 means changing the circulation pump status to a state where the speed is not 0.

[0069] For example, in some embodiments, after determining that the target speed is not 0, the target speed of the circulating pump is determined based on the static energy efficiency value, the dynamic energy efficiency value, the upper limit of energy efficiency value control, and the lower limit of energy efficiency value control. The method further includes: when the dynamic energy efficiency value is greater than the sum of the static energy efficiency value and the upper limit of energy efficiency value control, the operating speed is increased according to the PID proportional adjustment to obtain the target speed, so that the dynamic energy efficiency value is less than or equal to the sum of the static energy efficiency value and the upper limit of energy efficiency value control, and greater than or equal to the difference between the static energy efficiency value and the lower limit of energy efficiency value control.

[0070] For example, in some embodiments, after determining that the target speed is not 0, the target speed of the circulating pump is determined based on the static energy efficiency value, the dynamic energy efficiency value, the upper limit of energy efficiency value control, and the lower limit of energy efficiency value control. The method further includes: when the dynamic energy efficiency value is less than the difference between the static energy efficiency value and the lower limit of energy efficiency value control, the operating speed is reduced according to the PID proportional adjustment to obtain the target speed, so that the dynamic energy efficiency value is less than or equal to the sum of the static energy efficiency value and the upper limit of energy efficiency value control, and greater than or equal to the difference between the static energy efficiency value and the lower limit of energy efficiency value control.

[0071] Here, a dynamic energy efficiency value less than or equal to the sum of the static energy efficiency value and the upper limit of energy efficiency control, and greater than or equal to the difference between the static energy efficiency value and the lower limit of energy efficiency control, is equivalent to the difference between the dynamic and static energy efficiency values ​​being within a preset control range. The minimum value of this preset control range is the opposite of the lower limit of energy efficiency control, and the maximum value of this preset control range is the upper limit of energy efficiency control. Since the upper and lower limits of energy efficiency control are determined based on actual energy efficiency requirements, when the difference between the dynamic and static energy efficiency values ​​is within the preset control range, it indicates that the circulating pump is operating in a state that allows the energy storage system to be most energy-efficient, minimizing the energy storage and release time of the energy storage equipment while achieving the preset energy efficiency requirements.

[0072] By adjusting the speed of the circulating pump according to the PID ratio, the difference between the dynamic energy efficiency value and the static energy efficiency value is kept within the preset control range. Since the preset control range is determined based on the actual energy efficiency requirements, adjusting the speed of the circulating pump to keep the difference between the dynamic energy efficiency value and the static energy efficiency value within the preset control range can make the circulating water pump used by the energy storage equipment operate more efficiently and energy-savingly. On the basis of achieving the preset energy efficiency requirements, the energy storage and release time of the energy storage equipment can be shortened as much as possible.

[0073] For example, in some embodiments, after determining that the target speed is not 0, the target speed of the circulating pump is determined based on the static energy efficiency value, dynamic energy efficiency value, upper limit of energy efficiency value control, and lower limit of energy efficiency value control, and the circulating pump is controlled based on the target speed. Specifically, this includes: determining that COP2 > COP1 + A, controlling the circulating pump speed to increase according to the PID proportional adjustment; determining that COP2 < COP1 - B, controlling the circulating pump speed to decrease according to the PID adjustment proportional adjustment; and determining which COP1 - B ≤ COP2 ≤ COP1 + A, controlling the circulating pump speed to maintain the current speed.

[0074] Wherein, COP1 is the static energy efficiency value; COP2 is the dynamic energy efficiency value; A is the upper limit of energy efficiency value control, which can be in the range of 0 to 1; B is the lower limit of energy efficiency value control, which can be in the range of 0 to 1.

[0075] Here, the entity executing steps 201 to 203 can be a processor of a household appliance that implements the control method of the energy storage system in the embodiments of this application.

[0076] The technical solution of this application embodiment controls the speed of the circulating pump based on the static heat exchange, dynamic heat exchange, circulating pump power, and compressor power. Since the static heat exchange can characterize the heat exchange in the circulation mode without the circulating pump, and the dynamic heat exchange can characterize the heat exchange in the circulation mode with the circulating pump, and the circulating pump power and compressor power can be used to determine the energy conversion efficiency, by controlling the speed of the circulating pump based on the static heat exchange, dynamic heat exchange, circulating pump power, and compressor power, energy can be saved while ensuring heat exchange requirements, thus achieving energy-saving control of the circulating pump.

[0077] To better illustrate the purpose of this application, further examples are provided based on the embodiments described above. Figure 3 This is a second flowchart illustrating the control method of the energy storage system in the embodiments of this application.

[0078] like Figure 3 As shown, the control method of this energy storage system includes:

[0079] Step 301: Determine the static heat exchange capacity based on the material temperature of the energy storage material, the ambient temperature of the environment where the second heat exchanger is located, and the power of the compressor.

[0080] Step 302: Determine the dynamic heat exchange based on the material temperature of the energy storage material, the ambient temperature, the power of the compressor, and the first rotation speed of the circulating pump.

[0081] Step 303: Calculate the difference between dynamic heat exchange and static heat exchange, and the ratio of static heat exchange to the power of the real-time compressor.

[0082] Step 304: Calculate the product of the difference and the ratio to obtain the first parameter.

[0083] Step 305: Determine that the power of the circulating pump is greater than or equal to the first parameter and the duration exceeds the first preset duration, and determine the target speed as 0.

[0084] Step 306: Determine that the power of the circulating pump is less than or equal to the first parameter and the duration exceeds the second preset duration, and determine that the target speed is not 0.

[0085] Step 307: Control the circulating pump based on the target speed.

[0086] Here, the executing entity for steps 301 to 307 can be a processor of a household appliance that implements the control method of the energy storage system in the embodiments of this application.

[0087] The technical solution of this application embodiment controls the speed of the circulating pump based on the static heat exchange, dynamic heat exchange, circulating pump power, and compressor power. Since the static heat exchange can characterize the heat exchange in the circulation mode without the circulating pump, and the dynamic heat exchange can characterize the heat exchange in the circulation mode with the circulating pump, and the circulating pump power and compressor power can be used to determine the energy conversion efficiency, by controlling the speed of the circulating pump based on the static heat exchange, dynamic heat exchange, circulating pump power, and compressor power, energy can be saved while ensuring heat exchange requirements, thus achieving energy-saving control of the circulating pump.

[0088] For example, Figure 4 This is a schematic diagram of the third process of the control method for the energy storage system in the embodiments of this application.

[0089] like Figure 4 As shown, the control method for this energy storage system may specifically include:

[0090] Step 401: Determine the static heat exchange capacity based on the material temperature of the energy storage material, the ambient temperature of the environment where the second heat exchanger is located, and the power of the compressor.

[0091] Step 402: Determine the dynamic heat exchange based on the material temperature of the energy storage material, the ambient temperature, the power of the compressor, and the first rotation speed of the circulating pump.

[0092] Step 403: Determine the static energy efficiency value based on the static heat exchange and the compressor power.

[0093] Step 404: Determine the dynamic energy efficiency value based on the dynamic heat exchange, compressor power, and circulating pump power.

[0094] Step 405: If the dynamic energy efficiency value is greater than the sum of the static energy efficiency value and the upper limit of the energy efficiency value control, and the duration exceeds the third preset duration, then determine that the target speed is not 0.

[0095] Step 406: When the dynamic energy efficiency value is greater than the sum of the static energy efficiency value and the upper limit of the energy efficiency value control, increase the operating speed according to the PID proportional adjustment to obtain the target speed.

[0096] Step 407: When the dynamic energy efficiency value is less than the difference between the static energy efficiency value and the lower limit of the energy efficiency value control, reduce the operating speed according to the PID proportional adjustment to obtain the target speed.

[0097] Step 408: When the dynamic energy efficiency value is less than the difference between the static energy efficiency value and the lower limit of the energy efficiency value control, and the operating speed of the circulating pump is within the preset speed range for more than the fourth preset time, the target speed is determined to be 0.

[0098] Step 409: Control the circulating pump based on the target speed.

[0099] Here, the entity executing steps 401 to 409 can be a processor of a household appliance that implements the control method of the energy storage system according to the embodiments of this application.

[0100] The technical solution of this application embodiment adjusts the speed of the circulating pump according to the PID ratio, so that the difference between the dynamic energy efficiency value and the static energy efficiency value is kept within a preset control range. Since the preset control range is determined according to the actual energy efficiency requirements, by adjusting the speed of the circulating pump to keep the difference between the dynamic energy efficiency value and the static energy efficiency value within the preset control range, the circulating pump used by the energy storage device can operate more efficiently and energy-savingly. On the basis of achieving the preset energy efficiency requirements, the energy storage and release time of the energy storage device can be shortened as much as possible.

[0101] Figure 5 This is a schematic diagram of the composition of the control device for an energy storage system in an embodiment of this application, illustrating an implementation device for a control method of an energy storage system, applied to an energy storage system. The energy storage system includes: an energy storage device, a second heat exchanger, a compressor, a four-way valve, and a circulating pump; wherein, the energy storage device is equipped with a first heat exchanger and energy storage material, and the circulating pump is used to drive the energy storage material to circulate;

[0102] The control device 50 of the energy storage system specifically includes:

[0103] The processing module 501 is used to determine the static heat exchange based on the material temperature of the energy storage material, the ambient temperature of the environment where the second heat exchanger is located, and the power of the compressor; and to determine the dynamic heat exchange based on the material temperature of the energy storage material, the ambient temperature, the power of the compressor, and the first rotational speed of the circulating pump.

[0104] The control module 502 is used to determine the target speed of the circulating pump based on the static heat exchange, the dynamic heat exchange, the power of the circulating pump and the power of the compressor, and to control the circulating pump based on the target speed.

[0105] In some embodiments, the control module 502 is configured to determine a static energy efficiency value based on the static heat exchange and the power of the compressor; determine a dynamic energy efficiency value based on the dynamic heat exchange, the power of the compressor and the power of the circulating pump; and determine a target speed of the circulating pump based on the static energy efficiency value, the dynamic energy efficiency value, the upper limit of energy efficiency value control and the lower limit of energy efficiency value control.

[0106] In some embodiments, the control module 502 is used to determine that the target rotational speed is not 0 when the dynamic energy efficiency value is greater than the sum of the static energy efficiency value and the energy efficiency value control upper limit, and the duration of the difference exceeds a third preset duration.

[0107] In some embodiments, the control module 502 is used to determine that the target speed is 0 when the dynamic energy efficiency value is less than the difference between the static energy efficiency value and the lower limit of the energy efficiency value control, and the operating speed of the circulating pump is within a preset speed range for more than a fourth preset time.

[0108] In some embodiments, the control module 502 is configured to determine that when the dynamic energy efficiency value is greater than the sum of the static energy efficiency value and the upper limit of the energy efficiency value control, increase the operating speed according to the PID proportional adjustment to obtain the target speed, so that the dynamic energy efficiency value is less than or equal to the sum of the static energy efficiency value and the upper limit of the energy efficiency value control, and is greater than or equal to the difference between the static energy efficiency value and the lower limit of the energy efficiency value control.

[0109] In some embodiments, the control module 502 is configured to determine that when the dynamic energy efficiency value is less than the difference between the static energy efficiency value and the lower limit of the energy efficiency value control, reduce the operating speed according to the PID proportional adjustment to obtain the target speed, so that the dynamic energy efficiency value is less than or equal to the sum of the static energy efficiency value and the upper limit of the energy efficiency value control, and greater than or equal to the difference between the static energy efficiency value and the lower limit of the energy efficiency value control.

[0110] In some embodiments, the control module 502 is configured to calculate the difference between the dynamic heat exchange and the static heat exchange, and the ratio of the static heat exchange to the power of the real-time compressor; calculate the product of the difference and the ratio to obtain a first parameter; determine that the power of the circulating pump is greater than or equal to the first parameter and the duration exceeds a first preset duration, and determine that the target speed is 0; determine that the power of the circulating pump is less than or equal to the first parameter and the duration exceeds a second preset duration, and determine that the target speed is not 0.

[0111] Based on the hardware implementation of each unit in the control device of the above-mentioned energy storage system, this application embodiment also provides a household appliance. Figure 6 This is a schematic diagram of the composition and structure of a household appliance in an embodiment of this application. For example... Figure 6 As shown, the household appliance 60 includes: a processor 601 and a memory 602 configured to store computer programs capable of running on the processor;

[0112] The processor 601 is configured to execute the steps of the method in the foregoing embodiments when running a computer program.

[0113] Of course, in practical applications, such as Figure 6As shown, the various components in this household appliance are coupled together via a bus system 603. It can be understood that the bus system 603 is used to enable communication between these components. In addition to a data bus, the bus system 603 also includes a power bus, a control bus, and a status signal bus. However, for clarity, in... Figure 6 The general designated all buses as Bus System 603.

[0114] In practical applications, the aforementioned processor can be at least one of the following: Application-Specific Integrated Circuit (ASIC), Digital Signal Processing Device (DSPD), Programmable Logic Device (PLD), Field-Programmable Gate Array (FPGA), controller, microcontroller, and microprocessor. It is understood that for different household appliances, the electronic device used to implement the above processor function can also be other types, and the embodiments of this application do not specifically limit this.

[0115] The aforementioned memory can be volatile memory, such as random-access memory (RAM); or non-volatile memory, such as read-only memory (ROM), flash memory, hard disk drive (HDD), or solid-state drive (SSD); or a combination of the above types of memory, and provides instructions and data to the processor.

[0116] In an exemplary embodiment, this application also provides a computer-readable storage medium, such as a memory including a computer program, which can be executed by a processor of a household appliance to perform the steps of the aforementioned method.

[0117] It should be understood that the terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items. The expressions “having,” “may have,” “comprising,” and “including,” or “may include” and “may contain” used herein may be used to indicate the presence of a corresponding feature (e.g., an element such as a number, function, operation, or component), but do not exclude the presence of additional features.

[0118] It should be understood that although the terms "first," "second," "third," etc., may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other and are not necessarily used to describe a specific order or sequence. For example, without departing from the scope of the invention, first information can also be referred to as second information, and similarly, second information can also be referred to as first information. The technical solutions described in the embodiments of this application can be arbitrarily combined without conflict. In the several embodiments provided in this application, it should be understood that the disclosed methods, devices, and household appliances can be implemented in other ways. The embodiments described above are merely illustrative. For example, the division of units is merely a logical functional division, and there may be other division methods in actual implementation, such as: multiple units or components can be combined, or integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the various components shown or discussed can be through some interfaces, and the indirect coupling or communication connection of household appliances or units can be electrical, mechanical, or other forms.

[0119] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs. Furthermore, the functional units in the embodiments of this application may all be integrated into one processing unit, or each unit may be a separate unit, or two or more units may be integrated into one unit. The integrated unit may be implemented in hardware or in a combination of hardware and software functional units.

[0120] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A control method for an energy storage system, characterized in that, The energy storage system includes: an energy storage device, a second heat exchanger, a compressor, a four-way valve, and a circulating pump; wherein, the energy storage device is equipped with a first heat exchanger and energy storage material, and the circulating pump is used to drive the energy storage material to circulate. The method includes: The static heat exchange capacity is determined based on the material temperature of the energy storage material, the ambient temperature of the environment where the second heat exchanger is located, and the power of the compressor; the static heat exchange capacity characterizes the heat exchange capacity without the circulation pump. The dynamic heat exchange is determined based on the material temperature of the energy storage material, the ambient temperature, the power of the compressor, and the first rotational speed of the circulating pump; the dynamic heat exchange represents the heat exchange under the circulation of the circulating pump. Based on the static heat exchange, the dynamic heat exchange, the power of the circulating pump, and the power of the compressor, the target speed of the circulating pump is determined, and the circulating pump is controlled based on the target speed.

2. The method according to claim 1, characterized in that, Determining the target rotational speed of the circulating pump based on the static heat exchange, the dynamic heat exchange, the power of the circulating pump, and the power of the compressor includes: Based on the static heat exchange and the power of the compressor, the static energy efficiency value is determined; The dynamic energy efficiency value is determined based on the dynamic heat exchange, the power of the compressor, and the power of the circulating pump. The target speed of the circulating pump is determined based on the static energy efficiency value, the dynamic energy efficiency value, the upper limit of energy efficiency value control, and the lower limit of energy efficiency value control.

3. The method according to claim 2, characterized in that, Determining the target speed of the circulating pump based on the static energy efficiency value, the dynamic energy efficiency value, the upper limit of energy efficiency value control, and the lower limit of energy efficiency value control includes: When the dynamic energy efficiency value is determined to be greater than the sum of the static energy efficiency value and the upper limit of the energy efficiency value control, and the duration of this condition exceeds a third preset duration, the target rotational speed is determined to be non-zero.

4. The method according to claim 2 or 3, characterized in that, Determining the target speed of the circulating pump based on the static energy efficiency value, the dynamic energy efficiency value, the upper limit of energy efficiency value control, and the lower limit of energy efficiency value control includes: When the dynamic energy efficiency value is less than the difference between the static energy efficiency value and the lower limit of the energy efficiency value, and the operating speed of the circulating pump is within the preset speed range for more than a fourth preset time, the target speed is determined to be 0.

5. The method according to claim 3, characterized in that, The step of determining the target speed of the circulating pump based on the static energy efficiency value, the dynamic energy efficiency value, the upper limit of energy efficiency value control, and the lower limit of energy efficiency value control further includes: When the dynamic energy efficiency value is determined to be greater than the sum of the static energy efficiency value and the upper limit of the energy efficiency value control, the operating speed is increased according to the PID proportional adjustment to obtain the target speed, so that the dynamic energy efficiency value is less than or equal to the sum of the static energy efficiency value and the upper limit of the energy efficiency value control, and greater than or equal to the difference between the static energy efficiency value and the lower limit of the energy efficiency value control.

6. The method according to claim 3 or 5, characterized in that, The step of determining the target speed of the circulating pump based on the static energy efficiency value, the dynamic energy efficiency value, the upper limit of energy efficiency value control, and the lower limit of energy efficiency value control further includes: When the dynamic energy efficiency value is determined to be less than the difference between the static energy efficiency value and the lower limit of the energy efficiency value control, the operating speed is reduced according to the PID proportional adjustment to obtain the target speed, so that the dynamic energy efficiency value is less than or equal to the sum of the static energy efficiency value and the upper limit of the energy efficiency value control, and greater than or equal to the difference between the static energy efficiency value and the lower limit of the energy efficiency value control.

7. The method according to claim 1, characterized in that, Determining the target rotational speed of the circulating pump based on the static heat exchange, the dynamic heat exchange, the power of the circulating pump, and the power of the compressor includes: Calculate the difference between the dynamic heat exchange and the static heat exchange, and the ratio of the static heat exchange to the power of the real-time compressor; The first parameter is obtained by multiplying the difference by the ratio. If the power of the circulating pump is determined to be greater than or equal to the first parameter and the duration of this determination exceeds the first preset duration, then the target rotational speed is determined to be 0. If the power of the circulating pump is determined to be less than or equal to the first parameter and the duration exceeds the second preset duration, then the target rotational speed is determined to be non-zero.

8. A control device for an energy storage system, characterized in that, The energy storage system includes: an energy storage device, a second heat exchanger, a compressor, a four-way valve, and a circulating pump; wherein, the energy storage device is equipped with a first heat exchanger and energy storage material, and the circulating pump is used to drive the energy storage material to circulate. The device includes: The processing module is used to determine the static heat exchange based on the material temperature of the energy storage material, the ambient temperature of the environment where the second heat exchanger is located, and the power of the compressor; the static heat exchange represents the heat exchange without the circulation pump; and to determine the dynamic heat exchange based on the material temperature of the energy storage material, the ambient temperature, the power of the compressor, and the first rotational speed of the circulation pump; the dynamic heat exchange represents the heat exchange with the circulation pump. The control module is used to determine the target speed of the circulating pump based on the static heat exchange, the dynamic heat exchange, the power of the circulating pump, and the power of the compressor, and to control the circulating pump based on the target speed.

9. A household appliance, characterized in that, The household appliance includes: a processor and a memory configured to store computer programs capable of running on the processor. Wherein, when the processor is configured to run the computer program, it performs the steps of the method according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the computer program implements the steps of the method described in any one of claims 1 to 7.

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