Refrigeration control method, refrigeration control device, equipment, medium and program product

Abstract

The invention discloses a refrigeration control method, a refrigeration control device, equipment, a medium and a program product, the method is applied to main control equipment in an energy storage system, the energy storage system further comprises a compressor refrigeration loop, a cold storage loop and an energy storage battery pack, and the method comprises the steps that when it is determined that the energy storage battery pack is in a first discharge working condition, the compressor refrigeration loop is switched to the cold storage loop; the heat production power of the energy storage battery pack is determined, and the first discharge rate of the first discharge working condition is larger than the preset discharge rate; according to the discharging duration and the heat production power of the energy storage battery pack, the required cooling capacity is calculated; under the condition that the cold storage capacity of the cold storage loop is larger than the required cold capacity, the power grid electricity price at the current moment is obtained; and controlling the compressor refrigerating loop or the cold storage loop to refrigerate the energy storage battery pack according to the power grid electricity price. According to the method, the compressor refrigerating loop or the cold storage loop is controlled to refrigerate the energy storage battery pack according to the electricity price of the power grid under the condition that the required cooling capacity is small, and the operation safety of the energy storage system can be improved.

Description

Technical Field

[0001] The present application belongs to the field of energy storage technology, and in particular relates to a refrigeration control method, a refrigeration control device, equipment, a medium and a program product. Background Art

[0002] Energy storage technology is the key to ensuring the large-scale development of clean energy and the economic operation of power grids, and is also an important part of smart grids. As one of the important technologies and basic equipment for building smart grids, energy storage systems can significantly improve the regulation and capacity support capabilities of smart grids through reasonable configuration of energy storage systems.

[0003] At present, the energy storage system is configured with a compressor refrigeration unit and an energy storage battery pack. The compressor refrigeration unit and the energy storage battery pack operate synchronously. In order to reduce the overheating problem of the compressor refrigeration unit, the compressor refrigeration unit usually cools the energy storage battery pack with a larger set power.

[0004] However, when the grid electricity price that supplies power to the energy storage battery pack is high and the energy storage battery pack requires less cooling, the compressor refrigeration unit still cools the energy storage battery pack at a larger set power. The cooling capacity of the compressor refrigeration unit is greater than the required cooling capacity, resulting in energy waste and reducing the operating economy of the energy storage system. Summary of the invention

[0005] In view of this, the embodiments of the present application provide a refrigeration control method, a refrigeration control device, equipment, a medium and a program product to overcome the above problems of the prior art.

[0006] In a first aspect, an embodiment of the present application provides a refrigeration control method, which is applied to a main control device in an energy storage system, wherein the energy storage system further includes a compressor refrigeration circuit, a cold storage circuit, and an energy storage battery pack, and the main control device is connected to the compressor refrigeration circuit, the cold storage circuit, and the energy storage battery pack. The refrigeration control method includes: When it is determined that the energy storage battery pack is in a first discharge condition, determining the heat generation power of the energy storage battery pack, and a first discharge rate of the first discharge condition is greater than a preset discharge rate; Calculate the required cooling capacity based on the discharge time and heat generation power of the energy storage battery pack; When the cold storage capacity of the cold storage circuit is greater than the required cold storage capacity, the current grid electricity price is obtained, and the grid is used to supply power to the compressor refrigeration circuit; The compressor refrigeration circuit or the cold storage circuit is controlled according to the grid electricity price to cool the energy storage battery pack.

[0007] The solution provided in the present application is to control the compressor refrigeration circuit or the cold storage circuit to cool the energy storage battery group during the operation of the energy storage battery group when the demand for cooling capacity is small according to the power grid electricity price. For example, the cold storage circuit is controlled to cool the energy storage battery group during the peak power grid electricity price period, or the compressor refrigeration circuit is controlled to cool the energy storage battery group during the valley power grid electricity price period. This can effectively reduce the operating cost of the energy storage system and is conducive to improving the operating economy of the energy storage system.

[0008] Wherein, in some optional embodiments, the refrigeration control method further includes: When the cold storage capacity is less than or equal to the required cold storage capacity, the compressor refrigeration circuit and the cold storage circuit are controlled to cool the energy storage battery pack.

[0009] The solution provided in this embodiment controls the compressor refrigeration circuit and the cold storage circuit to cool the energy storage battery pack at the same time when the cold storage capacity pre-stored in the cold storage circuit is small. This can prevent the energy storage battery pack from overheating due to the cold capacity generated by the compressor refrigeration circuit being insufficient to cool the energy storage battery pack, which is beneficial to improving the operating safety of the energy storage system.

[0010] Among them, in some optional embodiments, controlling the compressor refrigeration circuit or the cold storage circuit to cool the energy storage battery pack according to the power grid electricity price includes: When the grid electricity price is at par or valley price, the compressor refrigeration circuit is controlled to cool the energy storage battery pack.

[0011] The solution provided in this embodiment controls the compressor refrigeration circuit to cool the energy storage battery pack when the grid electricity price is low. The refrigeration cost consumed by the compressor refrigeration circuit is low, thereby improving the operating economy of the energy storage system.

[0012] Among them, in some optional embodiments, controlling the compressor refrigeration circuit or the cold storage circuit to cool the energy storage battery pack according to the power grid electricity price includes: When the power price of the power grid is at peak price, the cold storage circuit is controlled to cool the energy storage battery pack.

[0013] The solution provided in this embodiment controls the cold storage circuit to cool the energy storage battery when the grid electricity price is high, thereby suppressing the high refrigeration cost consumed by the compressor refrigeration circuit, reducing the refrigeration cost of the energy storage system, and improving the operating economy of the energy storage system.

[0014] Wherein, in some optional embodiments, the refrigeration control method further includes: When it is determined that the energy storage battery group is not in the first discharge condition, obtaining the power price of the power grid; When the power price of the power grid is at the peak price, the compressor refrigeration circuit and the cold storage refrigeration circuit are controlled to stop working.

[0015] In the solution provided in this embodiment, when the energy storage battery pack is in a non-high rate discharge condition, the heat generated by the energy storage battery pack can be cooled by the environment. When the power grid electricity price is at a peak price, the compressor refrigeration circuit and the cold storage circuit are controlled to stop working, thereby suppressing the increase in refrigeration costs and the waste of refrigeration capacity, which is beneficial to reducing the operating cost of the energy storage system and improving the energy efficiency utilization rate of the energy storage system.

[0016] Wherein, in some optional embodiments, the refrigeration control method further includes: When the power price of the power grid is at par or valley price, the compressor refrigeration circuit is controlled to refrigerate the cold storage circuit so that the cold storage circuit stores the cold energy produced by the compressor refrigeration circuit.

[0017] The solution provided in this embodiment controls the cold storage circuit to store the cold energy produced by the compressor refrigeration circuit when the heat generation of the energy storage battery is small and the power grid electricity price is low, so that when the heat generation of the energy storage battery is large and the power grid electricity price is high, the cold energy stored in the cold storage circuit is used to cool the energy storage battery group, which is beneficial to reducing the operating cost of the energy storage system, thereby facilitating improving the operating economy of the energy storage system.

[0018] Among them, in some optional embodiments, the non-first discharge condition includes a second discharge condition and a charging condition, and the second discharge rate of the second discharge condition is less than or equal to a preset discharge rate.

[0019] In some optional embodiments, when it is determined that the energy storage battery pack is in the first discharging condition, determining the heat generation power of the energy storage battery pack includes: When it is determined that the energy storage battery pack is in the first discharging condition, determining the self-heating power of the energy storage battery pack; The heat generation power is calculated based on the discharge power and self-heating power of the energy storage battery group.

[0020] The solution provided in this embodiment calculates the heat generation power according to the discharge power and self-dissipation power of the energy storage battery group, thereby improving the calculation accuracy of the heat generation power.

[0021] Among them, in some optional embodiments, when it is determined that the energy storage battery pack is in the first discharging condition, determining the self-heating power of the energy storage battery pack includes: When determining that the energy storage battery pack is in the first discharge condition, obtaining the specific heat capacity, battery cell mass and temperature increment of the energy storage battery pack; The self-heating power is calculated based on the specific heat capacity, cell mass and temperature increment.

[0022] The solution provided in this embodiment calculates the self-heating power according to the specific heat capacity, the mass of the battery cell and the temperature increment of the energy storage battery pack, thereby improving the calculation accuracy of the self-heating power.

[0023] In a second aspect, an embodiment of the present application provides a refrigeration control device, which is applied to a main control device in an energy storage system. The energy storage system also includes a compressor refrigeration circuit, a cold storage circuit, and an energy storage battery pack. The main control device is connected to the compressor refrigeration circuit, the cold storage circuit, and the energy storage battery pack. The refrigeration control device includes: A determination module, used to determine the heat generation power of the energy storage battery group when it is determined that the energy storage battery group is in a first discharge condition, and a first discharge rate of the first discharge condition is greater than a preset discharge rate; A calculation module is used to calculate the required cooling capacity according to the discharge time and heat generation power of the energy storage battery pack; A first acquisition module is used to acquire the current power price of the power grid when the cold storage capacity of the cold storage circuit is greater than the required cold storage capacity, and the power grid is used to supply power to the compressor refrigeration circuit; The first control module is used to control the compressor refrigeration circuit or the cold storage circuit to cool the energy storage battery pack according to the power price of the power grid.

[0024] In a third aspect, an embodiment of the present application provides a main control device, including: Memory; one or more processors coupled to the memory; One or more applications, wherein the one or more applications are stored in a memory and configured to be executed by one or more processors, and the one or more applications are configured to execute the refrigeration control method provided in the first aspect above.

[0025] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, in which a program code is stored. The program code can be called by a processor to execute the refrigeration control method provided in the first aspect above.

[0026] In a fifth aspect, an embodiment of the present application provides a computer program product. When the computer program product is run on a computer device, the computer device executes the refrigeration control method provided in the first aspect above.

[0027] It can be understood that the beneficial effects of the second to fifth aspects mentioned above can be found in the relevant description of the first aspect mentioned above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or exemplary technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A schematic diagram of a scenario of an energy storage system provided in an embodiment of the present application is shown.

[0030] Figure 2 A flow chart of a refrigeration control method provided in an embodiment of the present application is shown.

[0031] Figure 3 Another flow chart of the refrigeration control method provided in an embodiment of the present application is shown.

[0032] Figure 4 A scenario flow diagram of a refrigeration control method provided in an embodiment of the present application is shown.

[0033] Figure 5 A structural block diagram of a refrigeration control device provided in an embodiment of the present application is shown.

[0034] Figure 6 A functional block diagram of a main control device provided in an embodiment of the present application is shown.

[0035] Figure 7 A computer-readable storage medium provided in an embodiment of the present application for storing or carrying a program code for implementing a refrigeration control method provided in an embodiment of the present application is shown.

[0036] Figure 8 A computer program product provided in an embodiment of the present application and used for storing or carrying program codes for implementing the refrigeration control method provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0037] In order to make the purpose, features, and advantages of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the embodiments described below are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0038] It should be understood that when used in this specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0039] It should also be understood that the terms used in this application specification are only for the purpose of describing specific embodiments and are not intended to limit the application. As used in this application specification and the appended claims, the singular forms "a", "an" and "the" are intended to include plural forms unless the context clearly indicates other working conditions.

[0040] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0041] In addition, in the description of the present application, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0042] Energy storage technology is the key to ensuring the large-scale development of clean energy and the economic operation of power grids, and is also an important part of smart grids. As one of the important technologies and basic equipment for building smart grids, energy storage systems can significantly improve the regulation and capacity support capabilities of smart grids through reasonable configuration of energy storage systems.

[0043] At present, the energy storage system is configured with a compressor refrigeration unit and an energy storage battery pack. The compressor refrigeration unit and the energy storage battery pack operate synchronously. In order to reduce the overheating problem of the compressor refrigeration unit, the compressor refrigeration unit usually cools the energy storage battery pack with a larger set power.

[0044] However, when the grid electricity price that supplies power to the energy storage battery pack is high and the energy storage battery pack requires less cooling, the compressor refrigeration unit still cools the energy storage battery pack at a larger set power. The cooling capacity of the compressor refrigeration unit is greater than the required cooling capacity, resulting in energy waste and reducing the operating economy of the energy storage system.

[0045] In view of the above problems, the embodiments of the present application provide a refrigeration control method, a refrigeration control device, equipment, a medium and a program product. The refrigeration control method is applied to a main control device in an energy storage system. The energy storage system also includes a compressor refrigeration circuit, a cold storage circuit and an energy storage battery pack. The main control device is connected to the compressor refrigeration circuit, the cold storage circuit and the energy storage battery pack. The refrigeration control method includes: when it is determined that the energy storage battery pack is in a first discharge condition, determining the heat generation power of the energy storage battery pack, and the first discharge rate of the first discharge condition is greater than a preset discharge rate; calculating the required cooling capacity according to the discharge time and the heat generation power of the energy storage battery pack; when the cold storage capacity of the cold storage circuit is greater than the required cooling capacity, obtaining the current grid electricity price, the grid is used to power the compressor refrigeration circuit; according to the grid electricity price, controlling the compressor refrigeration circuit or the cold storage circuit to cool the energy storage battery pack.

[0046] The solution provided in the present application is to control the compressor refrigeration circuit or the cold storage circuit to cool the energy storage battery group during the operation of the energy storage battery group when the demand for cooling capacity is small according to the power grid electricity price. For example, the cold storage circuit is controlled to cool the energy storage battery group during the peak power grid electricity price period, or the compressor refrigeration circuit is controlled to cool the energy storage battery group during the valley power grid electricity price period. This can effectively reduce the operating cost of the energy storage system and is conducive to improving the operating economy of the energy storage system.

[0047] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0048] See also Figure 1 , which shows a schematic diagram of an application scenario of the energy storage system provided in an embodiment of the present application. The energy storage system may include a first three-way valve 100, a second three-way valve 200, a compressor refrigeration unit 300, a cold storage tank 400, an energy storage battery pack 500 and a main control device 600. The main control device 600 can be communicatively connected to the first three-way valve 100, the second three-way valve 200, the compressor refrigeration unit 300, the cold storage tank 400 and the energy storage battery pack 500, and control the first three-way valve 100, the second three-way valve 200, the compressor refrigeration unit 300, the cold storage tank 400 and the energy storage battery pack 500 to work.

[0049] Among them, the first three-way valve 100 may include a first valve port, a second valve port and a third valve port, the first valve port is connected to the outlet end of the compressor refrigeration unit 300, the second valve port is connected to the inlet end of the cold storage tank 400, and the third valve port is connected to the first end of the energy storage battery pack 500.

[0050] The second three-way valve 200 may include a fourth valve port, a fifth valve port and a sixth valve port, the fourth valve port is connected to the inlet end of the compressor refrigeration unit 300, the fifth valve port is connected to the outlet end of the cold storage tank 400, and the sixth valve port is connected to the second end of the energy storage battery pack 500.

[0051] The first valve port, the third valve port, the fourth valve port, the sixth valve port and the compressor refrigeration unit 300 can constitute a compressor refrigeration circuit, and the second valve port, the third valve port, the fifth valve port, the sixth valve port and the cold storage tank 400 can constitute a cold storage circuit.

[0052] The compressor refrigeration unit 300 can be used to produce cold energy and refrigerate the energy storage battery group 500 via the compressor refrigeration circuit. The compressor refrigeration unit 300 can also provide storage cold energy to the cold storage tank 400 via the first valve port, the second valve port, the fourth valve port, and the fifth valve port, so that the cold storage tank 400 stores the storage cold energy.

[0053] The compressor refrigeration unit 300 may include a compressor 310, a condenser 320, and a plate heat exchanger 330. The compressor 310 may be connected to the exhaust port of the condenser 320 and the outlet end of the plate heat exchanger 330, and the air inlet of the condenser 320 is connected to the inlet end of the plate heat exchanger 330. The outlet end of the plate heat exchanger 330 is connected to the first valve port, and the inlet end of the plate heat exchanger 330 is connected to the fourth valve port.

[0054] The main control device 600 may include but is not limited to any one of a server or a terminal device.

[0055] The server may include but is not limited to an independent physical server, a server cluster or distributed system consisting of multiple physical servers, and a cloud server.

[0056] Terminal devices may include but are not limited to mobile terminal devices (for example, mobile phones, PDAs, tablet PCs, laptops, smart watches, smart bracelets, etc.) and fixed terminal devices (for example, desktop computers, smart panels, all-in-one computers, etc.).

[0057] In some embodiments, the energy storage system may further include a circulation pump 700, which is connected between the third valve port and the first end of the energy storage battery pack 500. The circulation pump 700 is communicatively connected to the main control device 600, and the main control device 600 may control the circulation pump 700 to work.

[0058] In some embodiments, the energy storage system may include but is not limited to any one of a super charging station or an energy storage power station.

[0059] See also Figure 2 , which shows a flow chart of a refrigeration control method provided by an embodiment of the present application. In a specific embodiment, the refrigeration control method can be applied to Figure 1 The main control device 600 in the energy storage system shown in FIG. Figure 2 The process shown is described in detail, and the refrigeration control method may include the following steps 110 to 120.

[0060] Step 110: When it is determined that the energy storage battery pack is in the first discharging condition, determine the heat generation power of the energy storage battery pack.

[0061] In the embodiment of the present application, the main control device can determine the heat generation power of the energy storage battery group when determining that the energy storage battery group is in the first discharge condition.

[0062] Among them, the first discharge rate of the first discharge condition can be greater than the preset discharge rate. The preset discharge rate can be used to characterize that the energy storage battery pack is in a high-rate discharge condition. The preset discharge rate may include but is not limited to a discharge rate pre-set by the user, or a discharge rate automatically generated by the main control device according to multiple refrigeration control processes.

[0063] The heat generation power can be used to characterize the heat generation power of the energy storage battery pack after being cooled by the environment during the discharge process.

[0064] When the main control device determines that the energy storage battery group is in the first discharge condition, it can determine the self-dissipation power of the energy storage battery group, and calculate the heat generation power according to the discharge power and self-dissipation power of the energy storage battery group, thereby improving the calculation accuracy of the heat generation power.

[0065] The self-heating power is the power of the energy storage battery pack being cooled by the environment. The self-heating power is related to the specific heat capacity, battery cell mass and temperature increment of the energy storage battery pack.

[0066] As an example, the energy storage battery group may include n energy storage batteries, and the discharge power of each energy storage battery is P1. The discharge power P2 of the energy storage battery group can be calculated according to Formula 1 based on the number of energy storage batteries n and the discharge power P1 of a single energy storage battery.

[0067] Formula 1 is: P2=n·P1.

[0068] The self-heating power of the energy storage battery group is P3. The heat generation power P4 can be calculated according to the discharge power P2 and the self-heating power P3 of the energy storage battery group according to Formula 2.

[0069] Formula 2 is: P4=P2-P3=n·P1-P3.

[0070] When the main control device determines that the energy storage battery pack is in the first discharge condition, the specific heat capacity, battery cell mass and temperature increment of the energy storage battery pack can be obtained, and the self-heating power can be calculated according to the specific heat capacity, battery cell mass and temperature increment, thereby improving the calculation accuracy of the self-heating power.

[0071] As an example, the specific heat capacity of the energy storage battery pack is c, the cell mass of the energy storage battery pack is m, and the temperature increment of the energy storage battery pack during the discharge time t is △T. The self-dissipation power P3 can be calculated according to Formula 3 based on the specific heat capacity c, the cell mass m and the temperature increment △T.

[0072] Formula three is: P3=c·m·△T.

[0073] Regarding the process in which the main control device obtains the specific heat capacity, cell mass and temperature increment of the energy storage battery pack, in some embodiments, the main control device can generate a first prompt message and receive the specific heat capacity, cell mass and temperature increment of the energy storage battery pack uploaded by the user according to the first prompt message.

[0074] Among them, the first prompt information can be used to prompt the user to upload the specific heat capacity, cell mass and temperature increment of the energy storage battery pack to the main control device. The first prompt information may include but is not limited to at least any one of text prompt information, sound prompt information and light prompt information.

[0075] Step 120: Calculate the required cooling capacity according to the discharge time and heat generation power of the energy storage battery pack.

[0076] In an embodiment of the present application, the main control device can calculate the required cooling capacity based on the discharge time and heat generation power of the energy storage battery group. The calorific value of the energy storage battery group is related to the discharge time and heat generation power of the energy storage battery group. The required cooling capacity is calculated based on the discharge time and heat generation power, thereby improving the calculation accuracy of the required cooling capacity.

[0077] The required cooling capacity can be used to characterize the minimum cooling capacity for cooling the heat generated by the energy storage battery pack, and the required cooling capacity can be calculated based on the heat generated by the energy storage battery pack.

[0078] As an example, the heat generation power of the energy storage battery group is P4, and the discharge time of the energy storage battery group is t. The required cooling capacity Q of the energy storage battery group can be calculated according to Formula 4 based on the heat generation power P4 and the discharge time t.

[0079] Formula 4 is: Q=P4·t.

[0080] Step 130: When the cold storage capacity of the cold storage circuit is greater than the required cold storage capacity, the current grid electricity price is obtained.

[0081] In the embodiment of the present application, when the cold storage capacity of the cold storage circuit is greater than the required cold storage capacity, the main control device can obtain the current grid electricity price.

[0082] Among them, the power grid can be used to power the compressor refrigeration circuit, and the power grid electricity price may include but is not limited to parity price, valley price and peak price.

[0083] In some implementations, the main control device may pre-store an electricity price table, and the main control device may search the electricity price table at the current moment to obtain the current grid electricity price.

[0084] The electricity price table can be used to characterize the corresponding relationship between different time ranges and electricity prices. For example, electricity prices can include parity, valley and peak prices, and different time ranges can include time range A (for example, 0:00 to 9:00), time range B (for example, 9:00 to 16:00) and time range C (for example, 16:00 to 24:00).

[0085] The correspondence between time range A, time range B and time range C and the electricity price can be shown in Table 1, that is, the electricity price table, and the current grid electricity price can be obtained based on the correspondence.

[0086] Table 1

[0087] It should be noted that the corresponding relationship between different time ranges and electricity prices may include but is not limited to that shown in Table 1.

[0088] In some implementations, the main control device may generate a second prompt message, and receive the current grid electricity price uploaded by the user according to the second prompt message.

[0089] The second prompt information may be used to prompt the user to upload the current grid electricity price to the main control device, and the second prompt information may include but is not limited to at least any one of text prompt information, sound prompt information, and light prompt information.

[0090] Step 140: Control the compressor refrigeration circuit or the cold storage circuit to cool the energy storage battery pack according to the grid electricity price.

[0091] In an embodiment of the present application, the main control device can control the compressor refrigeration circuit or the cold storage circuit to cool the energy storage battery group according to the power grid electricity price. During the operation of the energy storage battery group, when the demand for cooling is small, the compressor refrigeration circuit or the cold storage circuit is controlled to cool the energy storage battery group according to the power grid electricity price. For example, the cold storage circuit is controlled to cool the energy storage battery group during the peak power grid electricity price period, or the compressor refrigeration circuit is controlled to cool the energy storage battery group during the valley power grid electricity price period. This can effectively reduce the operating cost of the energy storage system and help improve the operating economy of the energy storage system.

[0092] In some embodiments, when the grid electricity price is at parity or valley price, the main control device can control the compressor refrigeration circuit to cool the energy storage battery pack. When the grid electricity price is low, the compressor refrigeration circuit is controlled to cool the energy storage battery pack. The refrigeration cost consumed by the compressor refrigeration circuit is low, thereby improving the operating economy of the energy storage system.

[0093] Among them, the main control device can control the first valve port, the third valve port, the fourth valve port and the sixth valve port to be in an open state, and control the second valve port and the fifth valve port to be in a closed state, and control the compressor and the circulating pump to start working, so as to control the compressor refrigeration circuit to cool the energy storage battery pack.

[0094] In some embodiments, when the grid electricity price is at peak price, the main control device can control the cold storage circuit to cool the energy storage battery group. When the grid electricity price is high, the cold storage circuit is controlled to cool the energy storage battery, thereby suppressing the high cooling cost consumed by the compressor refrigeration circuit, reducing the cooling cost of the energy storage system, and improving the operating economy of the energy storage system.

[0095] Among them, the main control device can control the second valve port, the third valve port, the fifth valve port and the sixth valve port to be in an open state, and control the first valve port and the fourth valve port to be in a closed state, and control the compressor and the circulating pump to start working, so as to control the cold storage circuit to cool the energy storage battery pack.

[0096] In some embodiments, when the cold storage capacity is less than or equal to the required cold storage capacity, the main control device can control the compressor refrigeration circuit and the cold storage circuit to cool the energy storage battery pack. When the cold storage capacity pre-stored in the cold storage circuit is small, the compressor refrigeration circuit and the cold storage circuit are controlled to cool the energy storage battery pack at the same time. This can prevent the energy storage battery pack from overheating due to the fact that the cold capacity generated by the compressor refrigeration circuit is insufficient to cool the energy storage battery pack, which is beneficial to improving the operating safety of the energy storage system.

[0097] Among them, the main control device can control the first valve port, the second valve port, the third valve port, the fourth valve port, the fifth valve port and the sixth valve port to be in the open state, and the compressor and the control circulation pump can be started to control the compressor refrigeration circuit and the cold storage circuit to cool the energy storage battery pack.

[0098] The solution provided in the present application determines the heat generation power of the energy storage battery group when it is determined that the energy storage battery group is in the first discharge condition, calculates the required cooling capacity according to the discharge time and the heat generation power of the energy storage battery group, obtains the power price of the power grid at the current moment when the cooling capacity of the cooling circuit is greater than the required cooling capacity, and controls the compressor refrigeration circuit or the cooling circuit to cool the energy storage battery group according to the power grid electricity price. During the operation of the energy storage battery group, when the required cooling capacity is small, controls the compressor refrigeration circuit or the cooling circuit to cool the energy storage battery group according to the power grid electricity price. For example, the cooling circuit is controlled to cool the energy storage battery group during the peak power period of the power grid, or the compressor refrigeration circuit is controlled to cool the energy storage battery group during the valley power period of the power grid. This can effectively reduce the operating cost of the energy storage system and is conducive to improving the operating economy of the energy storage system.

[0099] See also Figure 3 , which shows a flow chart of a refrigeration control method provided by another embodiment of the present application. In a specific embodiment, the refrigeration control method can be applied to Figure 1 The main control device 600 in the energy storage system shown in FIG. Figure 3 The process shown is described in detail, and the refrigeration control method may include the following steps 210 to 220.

[0100] Step 210: When it is determined that the energy storage battery group is not in the first discharging condition, the current grid electricity price is obtained.

[0101] In this embodiment, when the main control device determines that the energy storage battery group is not in the first discharging condition, it can obtain the current grid electricity price.

[0102] Among them, the non-first discharge condition may include a second discharge condition and a charging condition, and the second discharge rate of the second discharge condition may be less than or equal to a preset discharge rate, indicating that the second discharge condition is a low-rate discharge condition.

[0103] Step 220: When the grid electricity price is at the peak price, the compressor refrigeration circuit and the cold storage circuit are controlled to stop working.

[0104] In this embodiment, when the grid electricity price is at the peak price, the main control device can control the compressor refrigeration circuit and the cold storage circuit to stop working. The energy storage battery pack is in a non-high rate discharge condition, and the heat generated by the energy storage battery pack can be cooled by the environment. When the grid electricity price is at the peak price, the compressor refrigeration circuit and the cold storage circuit are controlled to stop working, which suppresses the increase in refrigeration costs and the waste of refrigeration capacity, which is beneficial to reducing the operating cost of the energy storage system and improving the energy efficiency utilization rate of the energy storage system.

[0105] Among them, the main control device can control the first valve port, the second valve port, the third valve port, the fourth valve port, the fifth valve port and the sixth valve port to be in a closed state, and the compressor and the control circulation pump can stop working to control the compressor refrigeration circuit and the cold storage circuit to stop working.

[0106] In some embodiments, when the grid electricity price is at parity or valley price, the main control device can control the compressor refrigeration circuit to refrigerate the cold storage circuit so that the cold storage circuit stores the cold produced by the compressor refrigeration circuit. When the heat generation of the energy storage battery is small and the grid electricity price is low, the cold storage circuit is controlled to store the cold produced by the compressor refrigeration circuit. When the heat generation of the energy storage battery is large and the grid electricity price is high, the cold stored in the cold storage circuit is used to cool the energy storage battery group, which is beneficial to reducing the operating cost of the energy storage system, thereby helping to improve the operating economy of the energy storage system.

[0107] Among them, the main control device can control the first valve port, the second valve port, the fourth valve port and the fifth valve port to be in an open state, and control the third valve port and the sixth valve port to be in a closed state, and control the compressor and the circulating pump to start working, so as to control the compressor refrigeration circuit to cool the cold storage circuit.

[0108] In one application scenario, such as Figure 4 As shown, the refrigeration control method may include the following steps 301 to 310 .

[0109] Step 301: Determine whether the energy storage battery pack is in a high rate discharge condition.

[0110] When it is determined that the energy storage battery pack is not in a high-rate discharge condition, step 302 is executed.

[0111] When it is determined that the energy storage battery pack is in a high rate discharge condition, step 305 is executed.

[0112] Step 302: Determine whether the grid electricity price is a peak price.

[0113] If it is determined that the grid electricity price is the peak price, execute step 303; When it is determined that the grid electricity price is a parity price or a valley price, step 304 is executed.

[0114] Step 303: Control the compressor refrigeration circuit and the cold storage circuit to stop working.

[0115] Step 304: Control the compressor refrigeration circuit to refrigerate the cold storage circuit.

[0116] Step 305: Determine the required cooling capacity of the energy storage battery group.

[0117] Step 306: Determine whether the cold storage capacity of the cold storage circuit is greater than the required cold storage capacity.

[0118] If it is determined that the cold storage capacity of the cold storage circuit is less than or equal to the required cold storage capacity, step 307 is executed; When it is determined that the cold storage capacity of the cold storage circuit is greater than the required cold storage capacity, step 308 is executed.

[0119] Step 307: Control the compressor refrigeration circuit and the cold storage circuit to cool the energy storage battery pack.

[0120] Step 308: Determine whether the grid electricity price is a peak price.

[0121] If it is determined that the grid electricity price is the peak price, execute step 309; When it is determined that the grid electricity price is a parity price or a valley price, step 310 is executed.

[0122] Step 309: Control the cold storage circuit to cool the energy storage battery pack.

[0123] Step 310: Control the compressor refrigeration circuit to cool the energy storage battery pack.

[0124] The solution provided in this embodiment obtains the current grid electricity price when it is determined that the energy storage battery pack is not in the first discharge condition, and controls the compressor refrigeration circuit and the cold storage circuit to stop working when the grid electricity price is the peak price. When the energy storage battery pack is not in a high-rate discharge condition, the heat generated by the energy storage battery pack can be cooled by the environment. When the grid electricity price is the peak price, the compressor refrigeration circuit and the cold storage circuit are controlled to stop working, which suppresses the increase in refrigeration cost and the waste of refrigeration capacity, and is beneficial to reducing the operating cost of the energy storage system, while improving the energy efficiency utilization rate of the energy storage system.

[0125] See also Figure 5 , which shows a refrigeration control device 800 provided by an embodiment of the present application. In a specific embodiment, the refrigeration control device 800 can be applied to Figure 1 The main control device 600 in the energy storage system shown in FIG. Figure 5The refrigeration control device 800 shown in the figure is described in detail. The refrigeration control device 800 may include a determination module 810, a calculation module 820, a first acquisition module 830 and a first control module 840.

[0126] The determination module 810 can be used to determine the heat generation power of the energy storage battery group when it is determined that the energy storage battery group is in the first discharge condition, and the first discharge rate of the first discharge condition can be greater than the preset discharge rate; the calculation module 820 can be used to calculate the required cooling capacity according to the discharge duration and heat generation power of the energy storage battery group; the first acquisition module 830 can be used to obtain the current grid electricity price when the cooling capacity of the cold storage circuit is greater than the required cooling capacity, and the grid can be used to power the compressor refrigeration circuit; the first control module 840 can be used to control the compressor refrigeration circuit or the cold storage circuit to cool the energy storage battery group according to the grid electricity price.

[0127] In some embodiments, the refrigeration control device 800 may further include a second control module.

[0128] The second control module can be used to control the compressor refrigeration circuit and the cold storage circuit to cool the energy storage battery pack when the cold storage capacity is less than or equal to the required cold capacity.

[0129] In some embodiments, the first control module 820 may include a first control unit.

[0130] The first control unit can be used to control the compressor refrigeration circuit to cool the energy storage battery pack when the grid electricity price is at par or valley price.

[0131] In some embodiments, the first control module 820 may include a second control unit.

[0132] The second control unit can be used to control the cold storage circuit to cool the energy storage battery pack when the grid electricity price is at a peak price.

[0133] In some embodiments, the refrigeration control device 800 may further include a second acquisition module and a third control module.

[0134] The second acquisition module can be used to obtain the current grid electricity price when it is determined that the energy storage battery pack is not in the first discharge condition, and the grid can be used to power the compressor refrigeration circuit; the third control module can be used to control the compressor refrigeration circuit and the cold storage circuit to stop working when the grid electricity price is the peak price.

[0135] In some embodiments, the refrigeration control device 800 may further include a fourth control module.

[0136] The fourth control module can be used to control the compressor refrigeration circuit to refrigerate the cold storage circuit when the grid electricity price is at parity or valley price, so that the cold storage circuit stores the cold energy produced by the compressor refrigeration circuit.

[0137] In some embodiments, the non-first discharge condition may include a second discharge condition and a charging condition, and a second discharge rate of the second discharge condition is less than or equal to a preset discharge rate.

[0138] In some implementations, the determination module 810 may include a determination unit and a calculation unit.

[0139] The determination unit can be used to determine the self-dissipation power of the energy storage battery group when it is determined that the energy storage battery group is in the first discharging condition; the calculation unit can be used to calculate the heat generation power according to the discharge power and self-dissipation power of the energy storage battery group.

[0140] In some implementations, the determining unit may include an acquiring subunit and a calculating subunit.

[0141] The acquisition subunit can be used to obtain the specific heat capacity, battery cell mass and temperature increment of the energy storage battery pack when it is determined that the energy storage battery pack is in the first discharge condition; the calculation subunit can be used to calculate the self-dissipation power based on the specific heat capacity, battery cell mass and temperature increment.

[0142] The solution provided in this embodiment determines the heat generation power of the energy storage battery group when it is determined that the energy storage battery group is in the first discharge condition, calculates the required cooling capacity according to the discharge time and the heat generation power of the energy storage battery group, obtains the power price of the power grid at the current moment when the cooling capacity of the cooling circuit is greater than the required cooling capacity, and controls the compressor refrigeration circuit or the cooling circuit to cool the energy storage battery group according to the power grid electricity price. During the operation of the energy storage battery group, when the required cooling capacity is small, controls the compressor refrigeration circuit or the cooling circuit to cool the energy storage battery group according to the power grid electricity price. For example, the cooling circuit is controlled to cool the energy storage battery group during the peak power period of the power grid electricity price, or the compressor refrigeration circuit is controlled to cool the energy storage battery group during the valley power period of the power grid electricity price. This can effectively reduce the operation cost of the energy storage system and is conducive to improving the operation economy of the energy storage system.

[0143] It should be noted that each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the embodiments can be referred to each other. For the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. Any processing method described in the method embodiment can be implemented by the corresponding processing module in the device embodiment, and will not be repeated one by one in the device embodiment.

[0144] In addition, each functional module in each embodiment of the present application can be integrated into a processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The above integrated modules can be implemented in the form of hardware or software functional modules.

[0145] See also Figure 6 , which shows a functional block diagram of a main control device 600 provided by an embodiment of the present application, and the main control device 600 may include one or more of the following components: a memory 610, a processor 620, and one or more applications, wherein the one or more applications may be stored in the memory 610 and configured to be executed by the one or more processors 620, and the one or more applications are configured to execute the method described in the aforementioned method embodiment.

[0146] The memory 610 may include a random access memory (RAM) or a read-only memory (ROM). The memory 610 may be used to store instructions, programs, codes, code sets or instruction sets. The memory 610 may include a program storage area and a data storage area, wherein the program storage area may store instructions for implementing an operating system, instructions for implementing at least one function (such as determining that the energy storage battery pack is in a first discharge condition, determining the required cooling capacity, controlling the compressor refrigeration circuit and / or the cold storage circuit to refrigerate the energy storage battery pack, controlling the compressor refrigeration circuit and the cold storage circuit to refrigerate the energy storage battery pack, obtaining the power grid electricity price, controlling the compressor refrigeration circuit or the cold storage circuit to refrigerate the energy storage battery pack, controlling the compressor refrigeration circuit to refrigerate the energy storage battery pack, controlling the cold storage circuit to refrigerate the energy storage battery pack, controlling the compressor refrigeration circuit and the cold storage circuit to stop working, controlling the compressor refrigeration circuit to refrigerate the cold storage circuit, storing cooling capacity, determining heat generation power, calculating the required cooling capacity, determining self-heating power, calculating heat generation power, obtaining specific heat capacity, obtaining battery cell mass, obtaining temperature increment, and calculating self-heating power, etc.), instructions for implementing the following various method embodiments, etc. The storage data area can also store data created by the main control device 600 during use (such as energy storage system, main control device, compressor refrigeration circuit, cold storage circuit, energy storage battery pack, first discharge condition, required cooling capacity, first discharge rate, preset discharge rate, cold storage capacity, current time, grid electricity price, grid, parity, valley price, peak price, second discharge condition, charging condition, second discharge rate, heat generation power, discharge time, self-heat dissipation power, discharge power, specific heat capacity, battery cell mass and temperature increment), etc.

[0147] The processor 620 may include one or more processing cores. The processor 620 uses various interfaces and lines to connect various parts of the entire main control device 600, and executes various functions and processes data of the main control device 600 by running or executing instructions, programs, code sets or instruction sets stored in the memory 610, and calling data stored in the memory 610. Optionally, the processor 620 can be implemented in at least one hardware form of digital signal processing (Digital Signal Processing, DSP), field programmable gate array (Field-Programmable Gate Array, FPGA), and programmable logic array (Programmable Logic Array, PLA). The processor 620 can integrate one or a combination of a central processing unit (Central Processing Unit, CPU), a graphics processing unit (Graphics Processing Unit, GPU) and a modem. Among them, the CPU mainly processes the operating system, user interface and application programs; the GPU is responsible for rendering and drawing display content; and the modem is used to process wireless communications. It can be understood that the above-mentioned modem may not be integrated into the processor 620, but may be implemented separately through a communication chip.

[0148] Please refer to Figure 7 , which shows a structural block diagram of a computer-readable storage medium provided in an embodiment of the present application. The computer-readable storage medium 900 stores a program code 910, which can be called by a processor to execute the method described in the above method embodiment.

[0149] The computer-readable storage medium 900 may be an electronic memory such as a flash memory, an EEPROM (electrically erasable programmable read-only memory), an EPROM, a hard disk, or a ROM. Optionally, the computer-readable storage medium 900 includes a non-transitory computer-readable storage medium. The computer-readable storage medium 900 has storage space for program code 910 for executing any method steps in the above method. These program codes can be read from or written to one or more computer program products. The program code 910 can be compressed, for example, in an appropriate form.

[0150] Please refer to Figure 8, which shows a structural block diagram of a computer program product 1000 provided in an embodiment of the present application. The computer program product 1000 includes a computer program / instruction 1010, and the computer program / instruction 1010 is stored in a computer-readable storage medium of a computer device. When the computer program product 1000 is run on a computer device, a processor of the computer device reads the computer program / instruction 1010 from the computer-readable storage medium, and the processor executes the computer program / instruction 1010, so that the computer device performs the method described in the above method embodiment.

[0151] The solution provided in this embodiment determines the required cooling capacity of the energy storage battery group when it is determined that the energy storage battery group is in the first discharge condition, and controls the compressor refrigeration circuit and / or the cold storage circuit to cool the energy storage battery group according to the cold storage capacity of the cold storage circuit and the required cooling capacity. When the energy storage battery group is in a higher rate discharge condition, the compressor refrigeration circuit and / or the cold storage circuit is controlled to cool the energy storage battery group according to the required cooling capacity of the energy storage battery group and the cold storage capacity of the cold storage circuit. This can prevent the energy storage battery group from overheating due to the insufficient cooling capacity produced by the compressor refrigeration circuit to cool the energy storage battery group, which is beneficial to improving the operation safety of the energy storage system.

[0152] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A refrigeration control method, characterized in that: A main control device applied to an energy storage system, wherein the energy storage system further comprises a compressor refrigeration circuit, a cold storage circuit and an energy storage battery pack, wherein the main control device is connected to the compressor refrigeration circuit, the cold storage circuit and the energy storage battery pack, and the refrigeration control method comprises: When it is determined that the energy storage battery pack is in a first discharge condition, determining the heat generation power of the energy storage battery pack, and a first discharge rate of the first discharge condition is greater than a preset discharge rate; Calculating the required cooling capacity according to the discharge time of the energy storage battery group and the heat generation power; When the cold storage capacity of the cold storage circuit is greater than the required cold storage capacity, obtaining the current power price of the power grid, which is used to supply power to the compressor refrigeration circuit; The compressor refrigeration circuit or the cold storage circuit is controlled according to the grid electricity price to cool the energy storage battery pack.

2. The refrigeration control method according to claim 1, characterized in that: Also includes: When the cold storage capacity is less than or equal to the required cold storage capacity, the compressor refrigeration circuit and the cold storage circuit are controlled to cool the energy storage battery pack.

3. The refrigeration control method according to claim 1, characterized in that: The step of controlling the compressor refrigeration circuit or the cold storage circuit to cool the energy storage battery pack according to the grid electricity price includes: When the grid electricity price is at par or valley price, the compressor refrigeration circuit is controlled to cool the energy storage battery pack.

4. The refrigeration control method according to claim 1, characterized in that: The step of controlling the compressor refrigeration circuit or the cold storage circuit to cool the energy storage battery pack according to the grid electricity price includes: When the power price of the power grid is a peak price, the cold storage circuit is controlled to cool the energy storage battery pack.

5. The refrigeration control method according to any one of claims 1 to 4, characterized in that: Also includes: When it is determined that the energy storage battery group is not in the first discharging condition, obtaining the power price of the power grid; When the grid electricity price is a peak price, the compressor refrigeration circuit and the cold storage circuit are controlled to stop working.

6. The refrigeration control method according to claim 5, characterized in that: Also includes: When the grid electricity price is at par or valley price, the compressor refrigeration circuit is controlled to refrigerate the cold storage circuit so that the cold storage circuit stores the cold energy produced by the compressor refrigeration circuit.

7. The refrigeration control method according to claim 5, characterized in that: The non-first discharge operating condition includes a second discharge operating condition and a charging operating condition, and a second discharge rate of the second discharge operating condition is less than or equal to the preset discharge rate.

8. The refrigeration control method according to any one of claims 1 to 4, characterized in that: The step of determining the heat generation power of the energy storage battery group when it is determined that the energy storage battery group is in the first discharging condition includes: When it is determined that the energy storage battery pack is in the first discharging condition, determining the self-heating power of the energy storage battery pack; The heat generation power is calculated according to the discharge power of the energy storage battery group and the self-heating power.

9. The refrigeration control method according to claim 8, characterized in that: The step of determining the self-heat dissipation power of the energy storage battery pack when it is determined that the energy storage battery pack is in the first discharging condition comprises: When determining that the energy storage battery pack is in the first discharging condition, obtaining the specific heat capacity, battery cell mass and temperature increment of the energy storage battery pack; The self-heating power is calculated according to the specific heat capacity, the mass of the battery core and the temperature increment.

10. A refrigeration control device, characterized in that: A main control device applied to an energy storage system, wherein the energy storage system further comprises a compressor refrigeration circuit, a cold storage circuit and an energy storage battery pack, wherein the main control device is connected to the compressor refrigeration circuit, the cold storage circuit and the energy storage battery pack, and the refrigeration control device comprises: A determination module, configured to determine the heat generation power of the energy storage battery pack when it is determined that the energy storage battery pack is in a first discharge condition, and a first discharge rate of the first discharge condition is greater than a preset discharge rate; A calculation module, used to calculate the required cooling capacity according to the discharge time of the energy storage battery group and the heat generation power; A first acquisition module is used to acquire the power price of the power grid at the current moment when the cold storage capacity of the cold storage circuit is greater than the required cold capacity, and the power grid is used to supply power to the compressor refrigeration circuit; The first control module is used to control the compressor refrigeration circuit or the cold storage circuit to cool the energy storage battery pack according to the grid electricity price.

11. A master control device, characterized in that: include: Memory; One or more processors coupled to the memory; One or more application programs, wherein the one or more application programs are stored in the memory and configured to be executed by the one or more processors, and the one or more application programs are configured to execute the refrigeration control method according to any one of claims 1 to 9.

12. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores program codes, and the program codes can be called by a processor to execute the refrigeration control method according to any one of claims 1 to 9.

13. A computer program product, characterized in that When the computer program product is run on a computer device, the computer device is enabled to execute the refrigeration control method according to any one of claims 1 to 9.

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