Refrigeration control methods, refrigeration control devices, equipment, media and process products

Abstract

The application discloses a refrigeration control method, a refrigeration control device, equipment, a medium and a program product. The method is applied to a master control device in an energy storage system, the energy storage system further comprises a compressor refrigeration circuit, a cold storage circuit and an energy storage battery pack, and the method comprises the following steps: determining the heat generation power of the energy storage battery pack when it is determined that the energy storage battery pack is in a first discharging working condition, the first discharging rate of the first discharging working condition being greater than a preset discharging rate; calculating a required cold quantity according to the discharging time length and the heat generation power of the energy storage battery pack; obtaining the power grid price at the current time when the cold storage quantity of the cold storage circuit is greater than the required cold quantity; and controlling the compressor refrigeration circuit or the cold storage circuit to perform refrigeration on the energy storage battery pack according to the power grid price. According to the method, the compressor refrigeration circuit or the cold storage circuit is controlled to perform refrigeration on the energy storage battery pack according to the power grid price when the required cold quantity is small, so that the operation safety of the energy storage system is improved.

Description

Technical Field

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

[0002] Energy storage technology is crucial for ensuring the large-scale development of clean energy and the economical operation of the power grid, and it is also an important component of the smart grid. As one of the key technologies and basic equipment for building a smart grid, energy storage systems, through proper configuration, can significantly improve the regulation and capacity support capabilities of the smart grid.

[0003] Currently, energy storage systems are equipped with compressor chillers and energy storage battery packs. The compressor chillers and energy storage battery packs operate synchronously. In order to reduce the overheating problem of the compressor chillers, the compressor chillers usually cool the energy storage battery packs at a higher set power.

[0004] However, when the grid electricity price for powering the energy storage battery pack is high and the energy storage battery pack requires relatively little cooling capacity, the compressor chiller still cools the energy storage battery pack at a relatively high set power. The cooling capacity of the compressor chiller exceeds 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 the above, embodiments of this application provide a refrigeration control method, refrigeration control device, equipment, medium, and program product to overcome the problems of the prior art.

[0006] In a first aspect, embodiments of this application provide a cooling control method applied to a main control device in an energy storage system. The energy storage system further includes a compressor cooling circuit, a cold storage circuit, and an energy storage battery pack. The main control device is connected to the compressor cooling circuit, the cold storage circuit, and the energy storage battery pack. The cooling control method includes:

[0007] Under the condition that the energy storage battery pack is in the first discharge condition, the heat generation power of the energy storage battery pack is determined, and the first discharge rate of the first discharge condition is greater than the preset discharge rate.

[0008] Calculate the required cooling capacity based on the discharge duration and heat generation power of the energy storage battery pack.

[0009] When the cold storage capacity of the cold storage circuit is greater than the required cold capacity, the current grid electricity price is obtained, and the grid is used to supply power to the compressor refrigeration circuit.

[0010] The compressor's refrigeration circuit or cold storage circuit is controlled according to the grid electricity price to cool the energy storage battery pack.

[0011] The solution provided in this application, during the operation of the energy storage battery pack, when the demand for cooling is low, controls the compressor cooling circuit or the cold storage circuit to cool the energy storage battery pack according to the grid electricity price. For example, the cold storage circuit is controlled to cool the energy storage battery pack during peak electricity price periods, or the compressor cooling circuit is controlled to cool the energy storage battery pack during off-peak electricity price periods. This can effectively reduce the operating cost of the energy storage system and improve the operating economy of the energy storage system.

[0012] In some optional embodiments, the cooling control method further includes:

[0013] When the cold storage capacity is less than or equal to the required cold capacity, the compressor refrigeration circuit and the cold storage circuit are controlled to cool the energy storage battery pack.

[0014] The solution provided in this embodiment, when the amount of cold storage pre-stored in the cold storage circuit is small, controls the compressor refrigeration circuit and the cold storage circuit to cool the energy storage battery pack simultaneously. This can suppress the phenomenon of overheating of the energy storage battery pack caused by insufficient cold energy produced by the compressor refrigeration circuit to cool the energy storage battery pack, which is beneficial to improving the operational safety of the energy storage system.

[0015] In some optional embodiments, the compressor refrigeration circuit or cold storage circuit is controlled to cool the energy storage battery pack according to the grid electricity price, including:

[0016] When the grid electricity price is at parity or off-peak, the compressor cooling circuit is controlled to cool the energy storage battery pack.

[0017] The solution provided in this embodiment controls the compressor cooling circuit to cool the energy storage battery pack when the grid electricity price is low. The cooling cost consumed by the compressor cooling circuit is low, which improves the operating economy of the energy storage system.

[0018] In some optional embodiments, the compressor refrigeration circuit or cold storage circuit is controlled to cool the energy storage battery pack according to the grid electricity price, including:

[0019] When the grid electricity price is at its peak, the cold storage circuit is controlled to cool the energy storage battery pack.

[0020] The solution provided in this embodiment controls the cooling circuit to cool the energy storage battery when the grid electricity price is high, which suppresses the problem of high cooling cost of the compressor cooling circuit, reduces the cooling cost of the energy storage system, and improves the operating economy of the energy storage system.

[0021] In some optional embodiments, the cooling control method further includes:

[0022] Obtain the grid electricity price when it is determined that the energy storage battery pack is not in the first discharge condition;

[0023] When the grid electricity price is at its peak, the compressor refrigeration circuit and the cold storage refrigeration circuit will stop working.

[0024] The solution provided in this embodiment allows the energy storage battery pack to cool down through the environment when it is not in a high-rate discharge condition. When the grid electricity price is at its peak, the compressor cooling circuit and the cold storage circuit can be stopped, which suppresses the increase in cooling costs and the waste of cooling capacity. This helps to reduce the operating cost of the energy storage system and improve the energy efficiency of the energy storage system.

[0025] In some optional embodiments, the cooling control method further includes:

[0026] When the grid electricity price is at parity or off-peak, the compressor refrigeration circuit is controlled to refrigerate the cold storage circuit so that the cold storage circuit stores the cooling capacity produced by the compressor refrigeration circuit.

[0027] The solution provided in this embodiment stores the cooling capacity generated by the compressor cooling circuit when the heat generation of the energy storage battery is relatively small and the grid electricity price is low. This allows the stored cooling capacity to be used to cool the energy storage battery pack when the heat generation of the energy storage battery is relatively large and the grid electricity price is high. This helps reduce the operating cost of the energy storage system and thus improves the operating economy of the energy storage system.

[0028] In some optional embodiments, the non-first discharge condition includes a second discharge condition and a charging condition, wherein the second discharge rate of the second discharge condition is less than or equal to a preset discharge rate.

[0029] In some optional embodiments, determining 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 includes:

[0030] Determine the self-heating power of the energy storage battery pack under the condition that the energy storage battery pack is in the first discharge condition;

[0031] Calculate the heat generation power based on the discharge power and self-heating power of the energy storage battery pack.

[0032] The solution provided in this embodiment calculates the heat generation power based on the discharge power and self-heating power of the energy storage battery pack, thereby improving the accuracy of the heat generation power calculation.

[0033] In some optional embodiments, when it is determined that the energy storage battery pack is in a first discharge condition, determining the self-heating power of the energy storage battery pack includes:

[0034] Under the condition that the energy storage battery pack is in the first discharge condition, obtain the specific heat capacity, cell mass and temperature increment of the energy storage battery pack;

[0035] The self-heating power is calculated based on specific heat capacity, cell mass, and temperature increment.

[0036] The solution provided in this embodiment calculates the self-heating power based on the specific heat capacity, cell mass, and temperature increment of the energy storage battery pack, thereby improving the accuracy of the self-heating power calculation.

[0037] Secondly, embodiments of this application provide a refrigeration control device, applied as a main control device in an energy storage system. The energy storage system further 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:

[0038] The determination module is used to determine the heat generation power of the energy storage battery pack when it is determined that the energy storage battery pack is in the first discharge condition, and the first discharge rate of the first discharge condition is greater than the preset discharge rate.

[0039] The calculation module is used to calculate the required cooling capacity based on the discharge duration and heat generation power of the energy storage battery pack.

[0040] The first acquisition module is used to acquire the current grid electricity price when the cold storage capacity of the cold storage circuit is greater than the required cold capacity. The grid is used to supply power to the compressor refrigeration circuit.

[0041] 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.

[0042] Thirdly, embodiments of this application provide a master control device, including:

[0043] Memory;

[0044] One or more processors, coupled to memory;

[0045] One or more applications, wherein one or more applications are stored in memory and configured to be executed by one or more processors, and one or more applications are configured to perform the cooling control method as provided in the first aspect above.

[0046] Fourthly, embodiments of this application provide a computer-readable storage medium storing program code, which can be called by a processor to execute the cooling control method provided in the first aspect above.

[0047] Fifthly, embodiments of this application provide a computer program product that, when run on a computer device, causes the computer device to execute the cooling control method provided in the first aspect above.

[0048] It is understood that the beneficial effects of the second to fifth aspects mentioned above can be found in the relevant descriptions in the first aspect mentioned above, and will not be repeated here. Attached Figure Description

[0049] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or exemplary technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0050] Figure 1 A schematic diagram of a scenario of the energy storage system provided in an embodiment of this application is shown.

[0051] Figure 2 A schematic flowchart of a refrigeration control method provided in an embodiment of this application is shown.

[0052] Figure 3 This paper illustrates another flowchart of the refrigeration control method provided in an embodiment of this application.

[0053] Figure 4 This illustration shows a scenario flow diagram of the cooling control method provided in an embodiment of this application.

[0054] Figure 5 A structural block diagram of a refrigeration control device provided in an embodiment of this application is shown.

[0055] Figure 6 A functional block diagram of a master control device provided in an embodiment of this application is shown.

[0056] Figure 7 This application illustrates a computer-readable storage medium for storing or carrying program code that implements a cooling control method according to an embodiment of this application.

[0057] Figure 8 This application illustrates a computer program product for storing or carrying program code that implements the refrigeration control method provided in this application. Detailed Implementation

[0058] To make the objectives, features, and advantages of this application more apparent and understandable, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0059] It should be understood that, when used in this specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0060] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0061] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0062] Furthermore, in the description of this application, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0063] Energy storage technology is crucial for ensuring the large-scale development of clean energy and the economical operation of the power grid, and it is also an important component of the smart grid. As one of the key technologies and basic equipment for building a smart grid, energy storage systems, through proper configuration, can significantly improve the regulation and capacity support capabilities of the smart grid.

[0064] Currently, energy storage systems are equipped with compressor chillers and energy storage battery packs. The compressor chillers and energy storage battery packs operate synchronously. In order to reduce the overheating problem of the compressor chillers, the compressor chillers usually cool the energy storage battery packs at a higher set power.

[0065] However, when the grid electricity price for powering the energy storage battery pack is high and the energy storage battery pack requires relatively little cooling capacity, the compressor chiller still cools the energy storage battery pack at a relatively high set power. The cooling capacity of the compressor chiller exceeds the required cooling capacity, resulting in energy waste and reducing the operating economy of the energy storage system.

[0066] To address the aforementioned issues, this application provides a cooling control method, cooling control device, equipment, medium, and program product. The cooling control method is applied to the main control equipment in an energy storage system. The energy storage system also includes a compressor cooling circuit, a cold storage circuit, and an energy storage battery pack. The main control equipment is connected to the compressor cooling circuit, the cold storage circuit, and the energy storage battery pack. The cooling control method includes: determining 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, wherein the first discharge rate of the first discharge condition is greater than a preset discharge rate; calculating the required cooling capacity based on the discharge duration and heat generation power of the energy storage battery pack; obtaining the current grid electricity price when the cold storage capacity of the cold storage circuit is greater than the required cooling capacity, wherein the grid is used to supply power to the compressor cooling circuit; and controlling the compressor cooling circuit or the cold storage circuit to cool the energy storage battery pack according to the grid electricity price.

[0067] The solution provided in this application, during the operation of the energy storage battery pack, when the demand for cooling is low, controls the compressor cooling circuit or the cold storage circuit to cool the energy storage battery pack according to the grid electricity price. For example, the cold storage circuit is controlled to cool the energy storage battery pack during peak electricity price periods, or the compressor cooling circuit is controlled to cool the energy storage battery pack during off-peak electricity price periods. This can effectively reduce the operating cost of the energy storage system and improve the operating economy of the energy storage system.

[0068] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0069] Please see Figure 1 The illustration shows an application scenario diagram of the energy storage system provided in the embodiments of this 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 operate.

[0070] 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.

[0071] 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.

[0072] The first valve port, the third valve port, the fourth valve port, the sixth valve port, and the compressor refrigeration unit 300 can form 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 form a cold storage circuit.

[0073] The compressor refrigeration unit 300 can be used to generate cooling capacity and cool the energy storage battery pack 500 via the compressor refrigeration circuit. The compressor refrigeration unit 300 can also supply stored cooling capacity 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 can store the stored cooling capacity.

[0074] 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. The inlet port 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 a first valve port, and the inlet end of the plate heat exchanger 330 is connected to a fourth valve port.

[0075] The main control device 600 may be any of the following, including but not limited to servers or terminal devices.

[0076] Servers can include, but are not limited to, independent physical servers, server clusters or distributed systems consisting of multiple physical servers, and cloud servers.

[0077] Terminal devices may include, but are not limited to, mobile terminal devices (e.g., mobile phones, PDAs, tablet PCs, laptops, smartwatches, smart bracelets, etc.) and fixed terminal devices (e.g., desktop computers, smart panels, all-in-one computers, etc.).

[0078] In some embodiments, the energy storage system may further include a circulation pump 700, which is connected between a third valve port and a first end of the energy storage battery pack 500. The circulation pump 700 is communicatively connected to a main control device 600, which can control the circulation pump 700 to operate.

[0079] In some implementations, the energy storage system may include, but is not limited to, any one of a supercharging station or an energy storage power station.

[0080] Please see Figure 2 The diagram illustrates a flowchart of a cooling control method provided in one embodiment of this application. In a specific embodiment, the cooling control method can be applied to, for example... Figure 1 The main control device 600 in the energy storage system shown below will be used as an example to explain... Figure 2 The process shown is described in detail. The refrigeration control method may include the following steps 110 to 120.

[0081] Step 110: Determine the heat generation power of the energy storage battery pack when it is determined that the energy storage battery pack is in the first discharge condition.

[0082] In this embodiment of the application, the main control device can determine the heat generation power of the energy storage battery pack when it determines that the energy storage battery pack is in the first discharge condition.

[0083] 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 the energy storage battery pack in a high-rate discharge condition. The preset discharge rate can include, but is not limited to, the discharge rate preset by the user, or the discharge rate automatically generated by the main control equipment based on multiple cooling control processes.

[0084] Heat generation power can be used to characterize the heat generation power of an energy storage battery pack after it has been cooled by the environment during discharge.

[0085] When the main control equipment determines that the energy storage battery pack is in the first discharge condition, it can determine the self-heating power of the energy storage battery pack and calculate the heat generation power based on the discharge power and self-heating power of the energy storage battery pack, thereby improving the accuracy of the heat generation power calculation.

[0086] Self-heating power is the power of the energy storage battery pack to be cooled by the environment. Self-heating power is related to the specific heat capacity, cell mass and temperature increment of the energy storage battery pack.

[0087] As an example, an energy storage battery pack may consist of n energy storage batteries, each with a discharge power of P1. The discharge power P2 of the energy storage battery pack 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.

[0088] Formula 1 is: P2 = n·P1.

[0089] The self-heating power of the energy storage battery pack is P3. The heat generation power P4 can be calculated according to Formula 2 based on the discharge power P2 and the self-heating power P3 of the energy storage battery pack.

[0090] Formula 2 is: P4 = P2 - P3 = n·P1 - P3.

[0091] When the main control equipment determines that the energy storage battery pack is in the first discharge condition, it can obtain the specific heat capacity, cell mass and temperature increment of the energy storage battery pack, and calculate the self-heating power based on the specific heat capacity, cell mass and temperature increment, thereby improving the accuracy of the self-heating power calculation.

[0092] 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 ΔT. The self-heating power P3 can be calculated according to Formula 3 based on the specific heat capacity c, the cell mass m, and the temperature increment ΔT.

[0093] Formula 3 is: P3 = c·m·△T.

[0094] Regarding the process by 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 based on the first prompt message.

[0095] 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 can include, but is not limited to, at least one of text prompt information, sound prompt information and light prompt information.

[0096] Step 120: Calculate the required cooling capacity based on the discharge duration and heat generation power of the energy storage battery pack.

[0097] In this embodiment, the main control device can calculate the required cooling capacity based on the discharge duration and heat generation power of the energy storage battery pack. The heat generation of the energy storage battery pack is related to the discharge duration and heat generation power of the energy storage battery pack. Calculating the required cooling capacity based on the discharge duration and heat generation power improves the accuracy of the required cooling capacity calculation.

[0098] Among them, the required cooling capacity can be used to characterize the minimum amount of cooling required to cool the heat generated by the energy storage battery pack. The required cooling capacity can be calculated based on the heat generated by the energy storage battery pack.

[0099] As an example, if the heat generation power of the energy storage battery pack is P4 and the discharge time of the energy storage battery pack is t, the required cooling capacity Q of the energy storage battery pack can be calculated according to Formula 4 based on the heat generation power P4 and the discharge time t.

[0100] Formula 4 is: Q = P4·t.

[0101] Step 130: If the cold storage capacity of the cold storage circuit is greater than the required cold capacity, obtain the current grid electricity price.

[0102] In this embodiment of the application, when the cold storage capacity of the cold storage circuit is greater than the required cold capacity, the main control device can obtain the current grid electricity price.

[0103] The power grid can be used to supply power to the compressor refrigeration circuit, and the power grid price can include, but is not limited to, parity price, off-peak price and peak price.

[0104] In some implementations, the main control device can pre-store an electricity price table, and the main control device can look up the electricity price table at the current time to obtain the grid electricity price at the current time.

[0105] The electricity price table can be used to represent the correspondence between different time ranges and electricity prices. For example, the electricity price can include flat price, off-peak price and peak price, and different time ranges can include time range A (e.g., 0:00 to 9:00), time range B (e.g., 9:00 to 16:00) and time range C (e.g., 16:00 to 24:00).

[0106] The correspondence between time range A, time range B, and time range C and electricity price can be shown in Table 1, i.e., the electricity price table. Based on this correspondence, the current grid electricity price can be obtained.

[0107] Table 1

[0108]

[0109] It should be noted that the correspondence between different time periods and electricity prices may include, but is not limited to, the relationship shown in Table 1.

[0110] In some implementations, the master control device can generate a second prompt message and receive the current grid electricity price uploaded by the user based on the second prompt message.

[0111] The second prompt information can be used to prompt the user to upload the current grid electricity price to the main control device. The second prompt information can be, but is not limited to, at least one of text prompt information, sound prompt information, and light prompt information.

[0112] Step 140: Control the compressor refrigeration circuit or cold storage circuit to cool the energy storage battery pack according to the grid electricity price.

[0113] In this embodiment, the main control device can control the compressor cooling circuit or the cold storage circuit to cool the energy storage battery pack according to the grid electricity price. During the operation of the energy storage battery pack, when the demand for cooling is low, the compressor cooling circuit or the cold storage circuit can be controlled to cool the energy storage battery pack according to the grid electricity price. For example, the cold storage circuit can be controlled to cool the energy storage battery pack during peak electricity price periods, or the compressor cooling circuit can be controlled to cool the energy storage battery pack during off-peak electricity price periods. This can effectively reduce the operating cost of the energy storage system and improve the operating economy of the energy storage system.

[0114] In some implementations, when the grid electricity price is at parity or off-peak, the main control equipment can control the compressor cooling circuit to cool the energy storage battery pack. When the grid electricity price is low, controlling the compressor cooling circuit to cool the energy storage battery pack results in lower cooling costs for the compressor cooling circuit, thus improving the operational economy of the energy storage system.

[0115] The main control equipment can control the first, third, fourth and sixth valve ports to be in the open state, control the second and fifth valve ports to be in the closed state, and control the compressor and circulating pump to start working, so as to control the compressor refrigeration circuit to cool the energy storage battery pack.

[0116] In some implementations, when the grid electricity price is at its peak, the main control equipment can control the cold storage circuit to cool the energy storage battery pack. When the grid electricity price is high, controlling the cold storage circuit to cool the energy storage battery suppresses the problem of high cooling costs consumed by the compressor cooling circuit, reduces the cooling cost of the energy storage system, and improves the operating economy of the energy storage system.

[0117] The main control equipment can control the second, third, fifth and sixth valve ports to be open, control the first and fourth valve ports to be closed, and control the compressor and circulating pump to start working, so as to control the cold storage circuit to cool the energy storage battery pack.

[0118] In some implementations, when the cold storage capacity is less than or equal to the required cold 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, controlling the compressor refrigeration circuit and the cold storage circuit to cool the energy storage battery pack simultaneously can suppress the phenomenon of overheating of the energy storage battery pack due to insufficient cold capacity generated by the compressor refrigeration circuit to cool the energy storage battery pack, which is beneficial to improving the operational safety of the energy storage system.

[0119] The main control equipment can control the first, second, third, fourth, fifth, and sixth valve ports to be in the open state, and start the compressor and control the circulating pump to control the compressor refrigeration circuit and the cold storage circuit to cool the energy storage battery pack.

[0120] The solution provided in this application, when determining that the energy storage battery pack is in its first discharge condition, determines the heat generation power of the energy storage battery pack, calculates the required cooling capacity based on the discharge duration and heat generation power of the energy storage battery pack, and obtains the current grid electricity price when the cooling capacity of the cold storage circuit is greater than the required cooling capacity. Based on the grid electricity price, it controls the compressor cooling circuit or the cold storage circuit to cool the energy storage battery pack. During the operation of the energy storage battery pack, when the required cooling capacity is low, it controls the compressor cooling circuit or the cold storage circuit to cool the energy storage battery pack based on the grid electricity price. For example, it controls the cold storage circuit to cool the energy storage battery pack during peak electricity price periods, or it controls the compressor cooling circuit to cool the energy storage battery pack during off-peak electricity price periods. This can effectively reduce the operating cost of the energy storage system and improve its operational economy.

[0121] Please see Figure 3 This illustrates a flowchart of a refrigeration control method provided in another embodiment of this application. In a specific embodiment, the refrigeration control method can be applied to, for example... Figure 1 The main control device 600 in the energy storage system shown below will be used as an example to explain... Figure 3 The process shown is described in detail. The refrigeration control method may include the following steps 210 to 220.

[0122] Step 210: If it is determined that the energy storage battery pack is not in the first discharge condition, obtain the grid electricity price at the current moment.

[0123] In this embodiment, when the main control device determines that the energy storage battery pack is not in the first discharge condition, it can obtain the current grid electricity price.

[0124] Among them, non-first discharge conditions may include second discharge conditions and charging conditions. The second discharge rate of the second discharge condition may be less than or equal to the preset discharge rate, indicating that the second discharge condition is a low-rate discharge condition.

[0125] Step 220: When the grid electricity price is at its peak, control the compressor refrigeration circuit and the cold storage circuit to stop working.

[0126] In this embodiment, when the grid electricity price is at its peak, the main control device can control the compressor cooling circuit and the cold storage circuit to stop working. 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. Controlling the compressor cooling circuit and the cold storage circuit to stop working when the grid electricity price is at its peak suppresses the increase in cooling costs and the waste of cooling capacity, which is conducive to reducing the operating cost of the energy storage system and improving the energy efficiency of the energy storage system.

[0127] The main control equipment can control the first, second, third, fourth, fifth, and sixth valve ports to be closed, and stop the compressor and control circulation pump to stop the compressor refrigeration circuit and cold storage circuit.

[0128] In some implementations, when the grid electricity price is at parity or off-peak, the main control device can control the compressor refrigeration circuit to cool the cold storage circuit, so that the cold storage circuit stores the cooling capacity generated by the compressor refrigeration circuit. When the heat generation of the energy storage battery is relatively small and the grid electricity price is low, the cold storage circuit can store the cooling capacity generated by the compressor refrigeration circuit. This allows the energy storage battery pack to be cooled by the cooling capacity stored in the cold storage circuit when the heat generation of the energy storage battery is relatively large and the grid electricity price is high. This helps to reduce the operating cost of the energy storage system and thus improves the operating economy of the energy storage system.

[0129] The main control equipment can control the first, second, fourth and fifth valve ports to be in the open state, and control the third and sixth valve ports to be in the closed state. It can also control the compressor and the circulating pump to start working, so as to control the compressor refrigeration circuit to refrigerate the cold storage circuit.

[0130] In one application scenario, such as Figure 4 As shown, the refrigeration control method may include the following steps 301 to 310.

[0131] Step 301: Determine whether the energy storage battery pack is in a high-rate discharge condition.

[0132] If it is determined that the energy storage battery pack is not in a high-rate discharge condition, proceed to step 302.

[0133] If it is determined that the energy storage battery pack is in a high-rate discharge condition, proceed to step 305.

[0134] Step 302: Determine whether the grid electricity price is a peak price.

[0135] If the grid electricity price is determined to be a peak price, proceed to step 303;

[0136] If the grid electricity price is determined to be either parity or off-peak, proceed to step 304.

[0137] Step 303: Control the compressor refrigeration circuit and cold storage circuit to stop working.

[0138] Step 304: Control the compressor refrigeration circuit to refrigerate the cold storage circuit.

[0139] Step 305: Determine the required cooling capacity of the energy storage battery pack.

[0140] Step 306: Determine whether the cold storage capacity of the cold storage circuit is greater than the required cold capacity.

[0141] If it is determined that the cold storage capacity of the cold storage circuit is less than or equal to the required cold capacity, proceed to step 307;

[0142] If it is determined that the cold storage capacity of the cold storage circuit is greater than the required cold capacity, proceed to step 308.

[0143] Step 307: Control the compressor refrigeration circuit and the cold storage circuit to cool the energy storage battery pack.

[0144] Step 308: Determine whether the grid electricity price is a peak price.

[0145] If the grid electricity price is determined to be a peak price, proceed to step 309;

[0146] If the grid electricity price is determined to be either parity or off-peak, proceed to step 310.

[0147] Step 309: Control the cold storage circuit to cool the energy storage battery pack.

[0148] Step 310: Control the compressor refrigeration circuit to cool the energy storage battery pack.

[0149] The solution provided in this embodiment, when determining that the energy storage battery pack is not in the first discharge condition, obtains the current grid electricity price, and when the grid electricity price is at its peak, controls the compressor cooling circuit and the cold storage circuit to stop working. 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. Controlling the compressor cooling circuit and the cold storage circuit to stop working when the grid electricity price is at its peak suppresses the increase in cooling costs and the waste of cooling capacity, which is conducive to reducing the operating cost of the energy storage system and improving the energy efficiency of the energy storage system.

[0150] Please see Figure 5 This illustrates a refrigeration control device 800 provided in one embodiment of this application. In a specific embodiment, the refrigeration control device 800 can be applied to, for example... Figure 1 The main control device 600 in the energy storage system shown below will be used as an example to explain... Figure 5The refrigeration control device 800 shown will be 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.

[0151] The determination module 810 can be used to determine the heat generation power of the energy storage battery pack when it is determined that the energy storage battery pack is in the first discharge condition. 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 based on the discharge duration and heat generation power of the energy storage battery pack. The first acquisition module 830 can be used to acquire the current grid electricity price when the cooling capacity of the cold storage circuit is greater than the required cooling capacity. The grid can be used to supply power to the compressor cooling circuit. The first control module 840 can be used to control the compressor cooling circuit or the cold storage circuit to cool the energy storage battery pack according to the grid electricity price.

[0152] In some embodiments, the refrigeration control device 800 may also include a second control module.

[0153] 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.

[0154] In some implementations, the first control module 820 may include a first control unit.

[0155] 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 parity or off-peak.

[0156] In some implementations, the first control module 820 may include a second control unit.

[0157] 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 its peak.

[0158] In some embodiments, the refrigeration control device 800 may further include a second acquisition module and a third control module.

[0159] The second acquisition module can be used to acquire the current grid electricity price when it is determined that the energy storage battery pack is not in the first discharge condition. The grid can be used to supply power to the compressor cooling circuit. The third control module can be used to control the compressor cooling circuit and the cold storage circuit to stop working when the grid electricity price is at its peak price.

[0160] In some embodiments, the refrigeration control device 800 may also include a fourth control module.

[0161] 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 off-peak, so that the cold storage circuit stores the cooling capacity produced by the compressor refrigeration circuit.

[0162] In some implementations, non-first discharge conditions may include second discharge conditions and charging conditions, wherein the second discharge rate of the second discharge condition is less than or equal to a preset discharge rate.

[0163] In some implementations, the determining module 810 may include a determining unit and a calculation unit.

[0164] The determination unit can be used to determine the self-heating power of the energy storage battery pack when it is determined that the energy storage battery pack is in the first discharge condition; the calculation unit can be used to calculate the heat generation power based on the discharge power and self-heating power of the energy storage battery pack.

[0165] In some implementations, the determining unit may include an acquisition subunit and a calculation subunit.

[0166] The acquisition subunit can be used to acquire the specific heat capacity, 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-heating power based on the specific heat capacity, cell mass, and temperature increment.

[0167] The solution provided in this embodiment determines the heat generation power of the energy storage battery pack when it is in the first discharge condition, calculates the required cooling capacity based on the discharge duration and heat generation power, and obtains the current grid electricity price when the cooling capacity of the cold storage circuit is greater than the required cooling capacity. It then controls the compressor cooling circuit or the cold storage circuit to cool the energy storage battery pack according to the grid electricity price. During the operation of the energy storage battery pack, when the required cooling capacity is low, the compressor cooling circuit or the cold storage circuit is controlled to cool the energy storage battery pack according to the grid electricity price. For example, the cold storage circuit is controlled to cool the energy storage battery pack during peak electricity price periods, or the compressor cooling circuit is controlled to cool the energy storage battery pack during off-peak electricity price periods. This effectively reduces the operating cost of the energy storage system and improves its operational economy.

[0168] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For device embodiments, since they are basically similar to method embodiments, the description is relatively simple; relevant parts can be referred to in the descriptions of the method embodiments. Any processing method described in the method embodiments can be implemented in the device embodiments through corresponding processing modules, and will not be elaborated upon further in the device embodiments.

[0169] Furthermore, the functional modules in the various embodiments of this application can be integrated into one processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The integrated modules described above can be implemented in hardware or as software functional modules.

[0170] Please see Figure 6 The diagram illustrates a functional block diagram of a master control device 600 provided in one embodiment of the present application. The master control device 600 may include one or more of the following components: a memory 610, a processor 620, and one or more application programs. One or more application programs may be stored in the memory 610 and configured to be executed by one or more processors 620. One or more application programs are configured to perform the methods as described in the foregoing method embodiments.

[0171] The memory 610 may include random access memory (RAM) or read-only memory. The memory 610 may be used to store instructions, programs, code, code sets, or instruction sets. The memory 610 may include a program storage area and a data storage area. The program storage area may store instructions for implementing the 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 cooling circuit and / or the cold storage circuit to cool the energy storage battery pack, controlling the compressor cooling circuit and the cold storage circuit to cool the energy storage battery pack, obtaining the grid electricity price, controlling the compressor cooling circuit or the cold storage circuit to cool the energy storage battery pack, controlling the compressor cooling circuit to cool the energy storage battery pack, controlling the cold storage circuit to cool the energy storage battery pack, controlling the compressor cooling circuit and the cold storage circuit to stop working, controlling the compressor cooling circuit to cool 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 cell mass, obtaining temperature increment, and calculating self-heating power, etc.), and instructions for implementing the various method embodiments described below. The data storage 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 price, valley price, peak price, second discharge condition, charging condition, second discharge rate, heat generation power, discharge duration, self-heating power, discharge power, specific heat capacity, cell quality, and temperature increment).

[0172] Processor 620 may include one or more processing cores. Processor 620 connects to various parts within the main control device 600 using various interfaces and lines, and performs various functions and processes data of the main control device 600 by running or executing instructions, programs, code sets, or instruction sets stored in memory 610, and by calling data stored in memory 610. Optionally, processor 620 may be implemented using at least one hardware form of Digital Signal Processing (DSP), Field-Programmable Gate Array (FPGA), or Programmable Logic Array (PLA). Processor 620 may integrate one or a combination of several of the following: Central Processing Unit (CPU), Graphics Processing Unit (GPU), and modem. The CPU primarily handles the operating system, user interface, and applications; the GPU is responsible for rendering and drawing the displayed content; and the modem handles wireless communication. It is understood that the modem may also not be integrated into processor 620 and may be implemented separately using a communication chip.

[0173] Please refer to Figure 7 This diagram illustrates a structural block diagram of a computer-readable storage medium provided in an embodiment of this application. The computer-readable storage medium 900 stores program code 910, which can be called by a processor to execute the methods described in the above method embodiments.

[0174] The computer-readable storage medium 900 may be an electronic memory such as flash memory, EEPROM (Electrically Erasable Programmable Read-Only Memory), EPROM, hard disk, or 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 that performs any of the method steps described above. This program code can be read from or written to one or more computer program products. The program code 910 may be compressed, for example, in a suitable form.

[0175] Please refer to Figure 8This diagram illustrates a structural block diagram of a computer program product 1000 provided in an embodiment of this application. The computer program product 1000 includes a computer program / instructions 1010, which is stored in a computer-readable storage medium of a computer device. When the computer program product 1000 runs on the computer device, the processor of the computer device reads the computer program / instructions 1010 from the computer-readable storage medium, and executes the computer program / instructions 1010, causing the computer device to perform the methods described in the above method embodiments.

[0176] The solution provided in this embodiment determines the required cooling capacity of the energy storage battery pack when it is in the first discharge condition. Based on the cooling capacity of the cold storage circuit and the required cooling capacity, the compressor cooling circuit and / or the cold storage circuit are controlled to cool the energy storage battery pack. When the energy storage battery pack is in a higher discharge rate condition, the compressor cooling circuit and / or the cold storage circuit are controlled to cool the energy storage battery pack based on the required cooling capacity of the energy storage battery pack and the cooling capacity of the cold storage circuit. This can suppress the phenomenon of overheating of the energy storage battery pack due to insufficient cooling capacity generated by the compressor cooling circuit, which is beneficial to improving the operational safety of the energy storage system.

[0177] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions 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 this application.

Claims

1. A refrigeration control method, characterized by, The application relates to 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; 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 the following steps: In a case where it is determined that the energy storage battery pack is in a first discharging working condition, a heat generation power of the energy storage battery pack is determined, and a first discharging rate of the first discharging working condition is greater than a preset discharging rate; wherein the preset discharging rate is used to represent that the energy storage battery pack is in a high-rate discharging working condition; A required cold quantity is calculated according to a discharging time length of the energy storage battery pack and the heat generation power; In a case where a cold storage quantity of the cold storage circuit is greater than the required cold quantity, an electricity grid price at a current time is obtained, and the electricity grid is used to supply power for the compressor refrigeration circuit; The compressor refrigeration circuit or the cold storage circuit is controlled to perform refrigeration on the energy storage battery pack according to the electricity grid price, including: in a case where the electricity grid price is a flat price or a valley price, the compressor refrigeration circuit is controlled to perform refrigeration on the energy storage battery pack; and in a case where the electricity grid price is a peak price, the cold storage circuit is controlled to perform refrigeration on the energy storage battery pack; In a case where the cold storage quantity is less than or equal to the required cold quantity, the compressor refrigeration circuit and the cold storage circuit are controlled to perform refrigeration on the energy storage battery pack.

2. The refrigeration control method according to claim 1, characterized in that, Further comprising: In a case where it is determined that the energy storage battery pack is in a non-first discharging working condition, the electricity grid price is obtained; In a case where the electricity grid price is a peak price, the compressor refrigeration circuit and the cold storage circuit are controlled to stop working.

3. The refrigeration control method according to claim 2, wherein, Further comprising: In a case where the electricity grid price is a flat price or a valley price, the compressor refrigeration circuit is controlled to perform refrigeration on the cold storage circuit, so that the cold storage circuit stores the cold quantity generated by the compressor refrigeration circuit.

4. The refrigeration control method according to claim 2, wherein The non-first discharging working condition comprises a second discharging working condition and a charging working condition, and a second discharging rate of the second discharging working condition is less than or equal to the preset discharging rate.

5. The refrigeration control method of claim 1, wherein, The step of determining the heat generation power of the energy storage battery pack in the case where it is determined that the energy storage battery pack is in the first discharging working condition comprises the following steps: In a case where it is determined that the energy storage battery pack is in the first discharging working condition, a self-heat dissipation power of the energy storage battery pack is determined; The heat generation power is calculated according to a discharging power of the energy storage battery pack and the self-heat dissipation power.

6. The refrigeration control method according to claim 5, wherein, The step of determining the self-heat dissipation power of the energy storage battery pack in the case where it is determined that the energy storage battery pack is in the first discharging working condition comprises the following steps: In a case where it is determined that the energy storage battery pack is in the first discharging working condition, a specific heat capacity, a cell mass and a temperature increment of the energy storage battery pack are obtained; The self-heat dissipation power is calculated according to the specific heat capacity, the cell mass and the temperature increment.

7. A refrigeration control device, characterized by The application relates to 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; 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 the following steps: determining, when it is determined that the energy storage battery pack is in a first discharging condition, a heat generation power of the energy storage battery pack, the first discharging condition being at a first discharging rate greater than a preset discharging rate; wherein the preset discharging rate is used to represent that the energy storage battery pack is in a high-rate discharging condition; calculating, according to a discharging duration of the energy storage battery pack and the heat generation power, a required cooling capacity; obtaining, when a cold storage capacity of the cold storage circuit is greater than the required cooling capacity, a power grid electricity price at a current time, the power grid being used to supply power for the compressor refrigeration circuit; controlling, according to the power grid electricity price, the compressor refrigeration circuit or the cold storage circuit to refrigerate the energy storage battery pack, including: when the power grid electricity price is a flat price or a valley price, controlling the compressor refrigeration circuit to refrigerate the energy storage battery pack; and when the power grid electricity price is a peak price, controlling the cold storage circuit to refrigerate the energy storage battery pack; controlling, when the cold storage capacity is less than or equal to the required cooling capacity, the compressor refrigeration circuit and the cold storage circuit to refrigerate the energy storage battery pack.

8. A master device, comprising: comprise: a 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 perform the refrigeration control method according to any one of claims 1 to 6.

9. A computer readable storage medium, characterized in that, The computer readable storage medium stores program codes, and the program codes can be called and executed by a processor to perform the refrigeration control method according to any one of claims 1 to 6.

10. A computer program product, characterised in that, The computer program product, when running on a computer device, enables the computer device to perform the refrigeration control method according to any one of claims 1 to 6.

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