Energy storage system and high-temperature discharge prevention control method thereof

Abstract

The invention discloses an energy storage system and an anti-high-temperature discharge control method thereof. The anti-high-temperature discharge control method comprises the following steps: acquiring a current actual environment temperature and a current energy storage inverter temperature; acquiring a weather forecast of a region where the energy storage inverter is located, and calculating a predicted environment temperature in a future preset time according to the weather forecast and the current actual environment temperature; obtaining temperature rise data of the energy storage inverter and an overall work plan of the energy storage inverter in a future preset time, and calculating a predicted temperature of the energy storage inverter in the future preset time; and acquiring a temperature protection value of the energy storage inverter, judging whether a moment when the predicted temperature of the energy storage inverter is greater than the temperature protection value of the energy storage inverter exists in the future preset time, if so, adjusting the overall work plan of the energy storage inverter in the future preset time, and if not, adjusting the overall work plan of the energy storage inverter in the future preset time. And each relay is controlled according to the adjusted overall work plan of the energy storage inverter in the future preset time. The method can meet the requirement of a user for the power supply stability of a key load.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage equipment, and in particular to an energy storage system and a high-temperature discharge prevention control method thereof. Background Art

[0002] With the development of power electronics technology, energy storage systems have entered thousands of households. In areas without power grids, self-generated and self-used microgrid systems are composed of energy storage batteries, photovoltaics and energy storage inverters.

[0003] When there is sufficient sunlight or the battery capacity is large enough, it can be assumed that the end user's load can be continuously supplied with energy through the energy storage inverter. The temperature of the energy storage inverter is affected by the load power, ambient temperature and operating time. The existing common inverters are basically unable to guarantee long-term operation at rated power. Long-term operation at full power will trigger the over-temperature protection of the energy storage inverter and terminate the power supply. However, refrigerators, lighting and other needs are necessary life needs of users and will inevitably be affected.

[0004] The disclosure of the above background technology content is only used to assist in understanding the concept and technical solution of the present invention. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above content has been disclosed on the filing date of this patent application, the above background technology should not be used to evaluate the novelty and creativity of the present application. Summary of the invention

[0005] In order to solve the above technical problems, the present invention proposes an energy storage system and a high-temperature discharge protection control method thereof, which can meet the user's requirements for the power supply stability of key loads.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: In a first aspect, the present invention discloses a high temperature discharge prevention control method for an energy storage system, comprising the following steps: S1: Obtain the current actual ambient temperature and the current energy storage inverter temperature; S2: Obtain the weather forecast for the area where the energy storage inverter is located, and calculate the expected ambient temperature within a preset time in the future based on the weather forecast and the current actual ambient temperature; S3: Obtain the temperature rise data of the energy storage inverter and the overall work plan of the energy storage inverter within a preset time in the future, and calculate the expected temperature of the energy storage inverter within a preset time in the future according to the temperature rise data of the energy storage inverter, the current temperature of the energy storage inverter, the expected ambient temperature within a preset time in the future, and the overall work plan of the energy storage inverter; the overall work plan of the energy storage inverter includes the work plans of the loads corresponding to all relays connected to the energy storage inverter; S4: Obtain the temperature protection value of the energy storage inverter, and determine whether there is a moment in the future preset time when the energy storage inverter temperature is expected to be greater than the temperature protection value of the energy storage inverter. If so, adjust the overall work plan of the energy storage inverter in the future preset time, and control each relay according to the adjusted overall work plan of the energy storage inverter in the future preset time.

[0007] Preferably, step S2 specifically includes: S21: Obtaining a weather forecast for the region where the energy storage inverter is located, and determining an ambient temperature table within a preset future time according to the weather forecast for the region where the energy storage inverter is located, wherein the ambient temperature table includes ambient temperatures at each preset unit time interval from the current moment to the preset future time; S22: Calculating a correction coefficient of the ambient temperature according to the current ambient temperature and the current actual ambient temperature; S23: Calculating the expected ambient temperature within a preset time in the future according to the ambient temperature table and the correction coefficient of the ambient temperature.

[0008] Preferably, step S3 specifically includes: S31: Acquire temperature rise data of the energy storage inverter, wherein the temperature rise data of the energy storage inverter includes a temperature change value of the energy storage inverter in a preset unit time under different ambient temperatures and different overall working plans; S32: Determine the temperature change value of the energy storage inverter in each preset unit time in the future preset time according to the temperature rise data of the energy storage inverter, the expected ambient temperature in the future preset time, and the overall work plan of the energy storage inverter; S33: According to the current energy storage inverter temperature and the temperature change value of the energy storage inverter in each preset unit time period in the future preset time, determine each expected energy storage inverter temperature at each preset unit time interval from the current moment to the future preset time, wherein the expected energy storage inverter temperature refers to the estimated value of the energy storage inverter temperature after the preset unit time.

[0009] Preferably, in step S4, determining whether there is a moment in the future preset time when the energy storage inverter temperature is expected to be greater than the energy storage inverter temperature protection value includes: It is determined whether the predicted energy storage inverter temperatures at each preset unit time interval from the current moment to the future preset time have values ​​greater than the energy storage inverter temperature protection value. If so, it means that there is a moment in the future preset time when the predicted energy storage inverter temperature is greater than the energy storage inverter temperature protection value.

[0010] Preferably, in step S4, adjusting the overall working plan of the energy storage inverter within a preset future time includes: A1: Obtaining the priority and first threshold of each relay connected to the energy storage inverter, where the first threshold refers to the upper limit of the relay level that needs to be guaranteed to work; A2: gradually adjusting the working plan of the loads corresponding to the relays connected to the energy storage inverter and having a priority lower than the first threshold within a future preset time, to obtain an adjusted overall working plan of the energy storage inverter within a future preset time; A3: Calculate the estimated energy storage inverter temperature after adjustment within the future preset time according to the overall work plan of the energy storage inverter within the future preset time after adjustment, the temperature rise data of the energy storage inverter, the current energy storage inverter temperature, and the estimated ambient temperature within the future preset time; A4: Determine whether there is a moment in the future preset time when the adjusted expected energy storage inverter temperature is greater than the energy storage inverter temperature protection value. If so, return to step A2; if not, control each relay according to the overall work plan of the energy storage inverter in the future preset time after the adjustment.

[0011] Preferably, step A2 specifically includes: adjusting the working plans of loads corresponding to a preset number of relays connected to the energy storage inverter and having a priority lower than the first threshold within a preset future time, to obtain an adjusted overall working plan of the energy storage inverter within the preset future time.

[0012] Preferably, in the process of gradually adjusting the working plan of the load corresponding to the relay with a priority lower than the first threshold connected to the energy storage inverter within the future preset time, priority is given to adjusting the working plan of the load corresponding to the relay with a lower priority connected to the energy storage inverter within the future preset time; in the case of equal relay priorities, priority is given to adjusting the working plan of the load corresponding to the relay closest to the current moment.

[0013] Preferably, step A4 specifically includes: A41: Determine whether there is a moment in the future preset time when the adjusted estimated energy storage inverter temperature is greater than the energy storage inverter temperature protection value, if yes, execute step A42, if no, execute step A43; A42: Determine whether the work plan of the loads corresponding to all relays connected to the energy storage inverter with a priority lower than the first threshold within the preset future time has been adjusted, if yes, execute step A43, if no, return to step A2; A43: Control each relay according to the overall working plan of the energy storage inverter within the adjusted future preset time.

[0014] In a second aspect, the present invention discloses an energy storage system, including an energy storage battery, a bidirectional DC unit, a unidirectional DC unit, an energy storage inverter and a load distribution unit, wherein the energy storage battery is connected to the bidirectional DC unit, the unidirectional DC unit and the bidirectional DC unit are respectively connected to the DC side of the energy storage inverter, the AC side of the energy storage inverter is connected to the load distribution unit, the load distribution unit includes a plurality of relays and a plurality of loads, each of the relays is respectively connected to each of the loads, the energy storage inverter is communicatively connected to the load distribution unit, and each of the relays is controlled by the high-temperature discharge protection control method of the energy storage system described in the first aspect.

[0015] In a third aspect, the present invention discloses a computer-readable storage medium, in which a computer program is stored, wherein the computer program is configured to be executable by a processor to execute the high-temperature discharge prevention control method for the energy storage system described in the first aspect.

[0016] Compared with the prior art, the beneficial effect of the present invention lies in: the energy storage system and the high-temperature discharge protection control method proposed in the present invention, by collecting the current actual ambient temperature and local weather forecast information, and combining the current energy storage inverter temperature and energy storage inverter temperature rise data, predict in advance whether the overall work plan within the future preset time is met. Whether the energy storage system can continuously supply power to loads with higher priority within the next preset time, and then control the switching state of each relay, ultimately solving the user's requirements for the stability of power supply to critical loads. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a structural diagram of an energy storage system according to a preferred embodiment of the present invention; Figure 2 It is a flow chart of a high temperature discharge prevention control method for an energy storage system according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0018] The following is a detailed description of the embodiments of the present invention. It should be emphasized that the following description is only exemplary and is not intended to limit the scope and application of the present invention.

[0019] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. In addition, connection can be used for both fixing and circuit / signal communication.

[0020] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0022] like Figure 1 As shown, Embodiment 1 of the present invention discloses an energy storage system, which is composed of a battery unit 10, a bidirectional DC unit 20, a unidirectional DC unit 30, an energy storage inverter 40 and a load distribution box unit 50, wherein the battery unit 10 is connected to the bidirectional DC unit 20, and the energy storage inverter 40 is respectively connected to the bidirectional DC unit 20, the unidirectional DC unit 30 and the load distribution box unit 50. The single-phase DC unit 30 can also be externally connected to a photovoltaic unit. The load distribution box unit 50 includes a plurality of controllable relays JDQ1, JDQ2, ..., and each relay JDQ1, JDQ2, ... is respectively connected to the corresponding loads Load1, Load2, ... Each relay has a data acquisition device that can calculate the power value of the load connected to the corresponding relay. The energy storage inverter 40 and the load distribution box unit 50 are connected by a communication circuit. In a specific embodiment, it is a 485 communication method. The energy storage inverter 40 can send control commands to the load distribution box unit 50 through the 485 communication method as needed to control the switching state of each relay. At the same time, the load power value connected to each relay can also be read through the 485 communication method.

[0023] In the energy storage system, the energy storage inverter will generate heat during operation, especially under high load and high temperature environment, its heat generation will increase significantly. The energy storage inverter is sensitive to high temperature, which will increase the resistance of its internal electronic components, thereby increasing power loss; at the same time, high temperature will also reduce the conversion efficiency of the inverter, affecting its performance and life, and may even cause failure or damage. Therefore, the inverter is usually equipped with an overheat (temperature) protection function, which will automatically shut down when the temperature exceeds a certain threshold, but this will affect the continuous operation of the system. In view of this, it is urgent to develop an effective high-temperature discharge control method to ensure that the inverter always operates below the overheat (temperature) protection threshold, thereby ensuring the stability and reliability of the energy storage system.

[0024] like Figure 2 As shown, the second embodiment of the present invention discloses a high temperature discharge prevention control method for an energy storage system, which is characterized by comprising the following steps: S1: Obtain the current actual ambient temperature and the current energy storage inverter temperature; S2: Obtain the weather forecast for the area where the energy storage inverter is located, and calculate the expected ambient temperature within a preset time in the future based on the weather forecast and the current actual ambient temperature; Wherein, step S2 specifically includes: S21: Obtain the weather forecast for the region where the energy storage inverter is located, and determine an ambient temperature table within a preset future time according to the weather forecast for the region where the energy storage inverter is located, wherein the ambient temperature table includes the ambient temperature at each preset unit time interval from the current moment to the preset future time; S22: Calculate the correction coefficient of the ambient temperature according to the current ambient temperature and the current actual ambient temperature; S23: Calculate the expected ambient temperature within a preset time in the future according to the ambient temperature table and the correction coefficient of the ambient temperature.

[0025] S3: Obtain the temperature rise data of the energy storage inverter and the overall work plan of the energy storage inverter within the future preset time, and calculate the expected temperature of the energy storage inverter within the future preset time according to the temperature rise data of the energy storage inverter, the current temperature of the energy storage inverter, the expected ambient temperature within the future preset time, and the overall work plan of the energy storage inverter; the overall work plan of the energy storage inverter includes the work plan of the loads corresponding to all relays connected to the energy storage inverter; Wherein, step S3 specifically includes: S31: Acquire temperature rise data of the energy storage inverter, where the temperature rise data of the energy storage inverter includes a temperature change value of the energy storage inverter in a preset unit time under different ambient temperatures and different overall working plans; S32: Determine the temperature change value of the energy storage inverter in each preset unit time in the future preset time according to the temperature rise data of the energy storage inverter, the expected ambient temperature in the future preset time, and the overall work plan of the energy storage inverter; S33: Determine the estimated energy storage inverter temperatures at each preset unit time interval from the current moment to the preset time in the future based on the current energy storage inverter temperature and the temperature change value of the energy storage inverter at each preset unit time in the future preset time. The estimated energy storage inverter temperature refers to the estimated value of the energy storage inverter temperature after the preset unit time.

[0026] For example, the preset future time is 4 hours, the preset unit time is 1 hour, and the current time is 8:00. Then, in this step, the estimated energy storage inverter temperature at every 1 hour interval between 8:00 and 12:00 is determined. The estimated energy storage inverter temperature refers to the estimated value of the energy storage inverter temperature after 1 hour. That is, in this step, a total of: the estimated values ​​of the energy storage inverter temperature after 1 hour corresponding to each of 8:00, 9:00, 10:00, 11:00, and 12:00 are determined. For example, the estimated value of the energy storage inverter temperature after 1 hour corresponding to 8:00 is the estimated value of the energy storage inverter temperature at 9:00.

[0027] S4: Obtain the temperature protection value of the energy storage inverter, and determine whether there is a moment in the future preset time when the energy storage inverter temperature is expected to be greater than the temperature protection value of the energy storage inverter. If so, adjust the overall work plan of the energy storage inverter in the future preset time, and control each relay according to the adjusted overall work plan of the energy storage inverter in the future preset time.

[0028] Wherein, step S4 specifically includes: S41: Obtaining a temperature protection value of the energy storage inverter; S42: Determine whether there is a moment in the future preset time when the energy storage inverter temperature is expected to be greater than the energy storage inverter temperature protection value, if yes, execute step S43, if no, execute step S44; Specifically, it is determined whether there is a value greater than the temperature protection value of the energy storage inverter in each preset unit time interval from the current moment to the future preset time. If so, it means that there is a moment in the future preset time when the energy storage inverter temperature is greater than the temperature protection value of the energy storage inverter. If not, it means that there is no moment in the future preset time when the energy storage inverter temperature is greater than the temperature protection value of the energy storage inverter.

[0029] S43: adjusting the overall working plan of the energy storage inverter within the future preset time, and controlling each relay according to the adjusted overall working plan of the energy storage inverter within the future preset time; proceeding to step S44; This step specifically includes: S431: Obtaining the priority and first threshold of each relay connected to the energy storage inverter, where the first threshold refers to the upper limit of the relay level that needs to be guaranteed to work at all times; S432: gradually adjusting the work plan of the loads corresponding to the relays whose priorities are lower than the first threshold and connected to the energy storage inverter within the future preset time, to obtain the adjusted overall work plan of the energy storage inverter within the future preset time; This step specifically includes: adjusting the work plan of the load corresponding to the relays with a priority lower than the first threshold value connected to the preset number of energy storage inverters within the preset time in the future, and obtaining the adjusted overall work plan of the energy storage inverter within the preset time in the future. Further, the work plan of the load corresponding to the relay with a lower priority connected to the energy storage inverter within the preset time in the future is adjusted preferentially; wherein, in the case of equal relay priority, the work plan of the load corresponding to the relay closest to the current moment is adjusted preferentially.

[0030] In a specific example, for example, one or two work plans of the loads corresponding to the relays connected to the energy storage inverter with a priority lower than the first threshold value within a preset time in the future can be adjusted each time. Alternatively, in other embodiments, the work plans of the loads corresponding to all relays connected to the energy storage inverter with a priority lower than the first threshold value can be adjusted for a preset number of times; for example, there are three relays in the energy storage inverter with a priority lower than the first threshold value, and the adjustment can be divided into three times, the first time to adjust the work plan of the relay with the lowest priority in the energy storage inverter at all times, the second time to adjust the work plan of the relay with the second lowest priority in the energy storage inverter at all times, and the third time to adjust the work plan of the relay with the third lowest priority in the energy storage inverter at all times.

[0031] S433: Calculating the estimated energy storage inverter temperature after adjustment within the future preset time according to the overall work plan of the energy storage inverter within the future preset time after adjustment, the temperature rise data of the energy storage inverter, the current energy storage inverter temperature, and the estimated ambient temperature within the future preset time; S434: Determine whether there is a moment in the future preset time when the adjusted expected energy storage inverter temperature is greater than the energy storage inverter temperature protection value. If so, return to step S432; if not, control each relay according to the overall work plan of the energy storage inverter in the future preset time after the adjustment, and continue to step S44.

[0032] This step specifically includes: S4341: Determine whether there is a moment in the future preset time when the adjusted estimated energy storage inverter temperature is greater than the energy storage inverter temperature protection value; if yes, execute step S4342; if no, execute step S4343; S4342: Determine whether the work plan of the loads corresponding to all relays connected to the energy storage inverter with a priority lower than the first threshold within the preset future time has been adjusted, if yes, execute step S4343, if no, return to step S432; S4343: Control each relay according to the adjusted overall working plan of the energy storage inverter within the future preset time, and continue to step S44.

[0033] S44: This round of control method ends.

[0034] The following is a further detailed description of the high temperature discharge control method for the energy storage system proposed in the second embodiment of the present invention in combination with a specific example. The high temperature discharge control method for the energy storage system of this specific example includes: B1: The energy storage system obtains local weather forecast information through wireless / wired network communication with the remote server, and then executes step B2; B2: reading the temperature rise data of the energy storage inverter stored in the energy storage inverter, the temperature rise data of the energy storage inverter including the temperature change value of the energy storage inverter in a preset unit time under different ambient temperatures and different overall working plans, and then executing step B3; B3: The energy storage inverter collects current temperature information, including the current actual ambient temperature and the current energy storage inverter temperature, and then executes step B4; B4: Generate ambient temperature information within a certain number of hours from the current time. The data adopts the weather forecast information received in step B1 and combines it with the clock information of the current energy storage inverter. For example, in one embodiment, 4 hours are selected. If the current energy storage inverter clock shows 9:00 on Xth day of Xth month of 2024, then this table is the data in hours from the current 9:00 to 13:00. The next step is to execute step B5; B5: Calculate the ambient temperature correction coefficient, which is calculated by the ratio of the current actual ambient temperature to the ambient temperature from the weather forecast at the current moment. For example, the current actual ambient temperature is represented by T_Environment, and the ambient temperature of the current weather forecast is represented by T_Now, then the ambient temperature correction coefficient T_Scale = T_Environment / T_Now. The next step is to execute step B6; B6: Generate the ambient temperature correction data within 4 hours, multiply the temperature data of each hour in the ambient temperature information in step B4 by the correction coefficient T_Scale generated in step B5 to obtain the expected ambient temperature in the next 4 hours. Next, execute step B7; B7: The energy storage inverter reads the overall work plan within 4 hours, and then executes step B8; B8: Generate predicted temperature information of the energy storage inverter. At this time, the ambient temperature correction data generated in step B6, the temperature rise data in step B2, and the overall work plan in step B7 are used to obtain the temperature change value within 1 hour, and then combined with the current energy storage inverter temperature to obtain the estimated energy storage inverter temperature of the energy storage inverter, where the estimated energy storage inverter temperature corresponds to the estimated value of the energy storage inverter temperature after 1 hour. For example, according to the temperature rise data, the ambient temperature at the current moment, and the overall work plan, the temperature change value within 1 hour is +10°C. According to the current energy storage inverter temperature of 78°C, the estimated value of the energy storage inverter temperature 1 hour after the current moment can be obtained as 78°C+10°C=88°C, and so on. The next step is to execute step B9; B9: Obtain the temperature protection value of the energy storage inverter, and determine whether there is a corresponding time (9:00, 10:00, 11:00, 12:00, 13:00) within 4 hours when the energy storage inverter temperature exceeds the temperature protection value of the energy storage inverter. If yes, execute step B10; if not, execute step B12; B10: Modify the overall work plan; The upper limit of the relay level that needs to be guaranteed can be set through the mobile phone APP, for example, Figure 1 The priorities of the four relays shown are JDQ1>JDQ2>JDQ3>JDQ4. If the user sets the upper limit of the relay level that needs to be guaranteed to work to 2, it means that the user wants to ensure uninterrupted power supply to JDQ1 and JDQ2 during the entire loading process. Therefore, in the process of modifying the overall work plan, only the relays with a priority lower than 2 are adjusted, that is, only the work plans of JDQ3 and JDQ4 are adjusted. In this specific example, the work plan of the relay with a low priority can be adjusted first, that is, the work plan of JDQ4 can be adjusted first. In the case of equal relay priorities, the work plan of the relay closest to the current moment is adjusted first. Repeat the correction strategy in this step until there is no over-temperature data in the overall work plan within 4 hours.

[0035] It should be noted that: (1) if the requirements are still not met after adjusting the working plans of all relays with a priority lower than 2, the adjustment is stopped; (2) the power information of each relay at the current moment is the load power information actually connected to each relay at the current moment, which is read in real time by the energy storage inverter through the 485 communication between the energy storage inverter and the load distribution box unit 50. The next step is to execute step B11; B11: Control the relay switch state at the current moment, and control the state of each relay in the current load distribution box unit 50 according to the correction result of the overall working plan of each relay JDQ1~JDQ4 at the current moment. Next, execute step B12; B12: This round of algorithm ends; The data in the above specific embodiments are shown in Tables 1 to 3 below, wherein the leftmost column in Table 1 indicates the specific steps according to which the parameters of each row are obtained.

[0036] Table 1 Data in specific embodiments of the present invention

[0037] Table 2 Overall work plan

[0038] Table 3 Revised overall work plan

[0039] In the energy storage system disclosed in the first embodiment of the present invention, the energy storage inverter is communicatively connected with the load power distribution unit 50, and each relay is controlled by the high-temperature discharge prevention control method of the energy storage system in the second embodiment.

[0040] Embodiment 3 of the present invention discloses a computer-readable storage medium, in which a computer program is stored. The computer program is configured to be executable by a processor to execute the high-temperature discharge prevention control method of the energy storage system in the above-mentioned embodiment 1.

[0041] Optionally, the computer-readable storage medium may include, but is not limited to, various media that can store computer programs, such as a USB flash drive, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk or an optical disk.

[0042] The background section of the present invention may contain background information about the problem or environment of the present invention, rather than describing the prior art by others. Therefore, the content contained in the background section is not an admission by the applicant that the prior art is available.

[0043] The above content is a further detailed description of the present invention in combination with specific / preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, without departing from the concept of the present invention, it can also make several substitutions or modifications to these described embodiments, and these substitutions or modifications should be regarded as belonging to the protection scope of the present invention. In the description of this specification, the description of reference terms "an embodiment", "some embodiments", "preferred embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily target the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, in the absence of mutual contradiction, the technical personnel in this field can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples. Although the embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions and modifications can be made herein without departing from the scope defined by the attached claims.

Claims

1. A high temperature discharge control method for an energy storage system, characterized in that: The following steps are involved: S1: Obtain the current actual ambient temperature and the current energy storage inverter temperature; S2: Obtain the weather forecast for the area where the energy storage inverter is located, and calculate the expected ambient temperature within a preset time in the future based on the weather forecast and the current actual ambient temperature; S3: Obtain the temperature rise data of the energy storage inverter and the overall work plan of the energy storage inverter within a preset time in the future, and calculate the expected temperature of the energy storage inverter within a preset time in the future according to the temperature rise data of the energy storage inverter, the current temperature of the energy storage inverter, the expected ambient temperature within a preset time in the future, and the overall work plan of the energy storage inverter; the overall work plan of the energy storage inverter includes the work plans of the loads corresponding to all relays connected to the energy storage inverter; S4: Obtain the temperature protection value of the energy storage inverter, and determine whether there is a moment in the future preset time when the energy storage inverter temperature is expected to be greater than the temperature protection value of the energy storage inverter. If so, adjust the overall work plan of the energy storage inverter in the future preset time, and control each relay according to the adjusted overall work plan of the energy storage inverter in the future preset time.

2. The high temperature discharge prevention control method for the energy storage system according to claim 1, characterized in that: Step S2 specifically includes: S21: Obtaining a weather forecast for the region where the energy storage inverter is located, and determining an ambient temperature table within a preset future time according to the weather forecast for the region where the energy storage inverter is located, wherein the ambient temperature table includes ambient temperatures at each preset unit time interval from the current moment to the preset future time; S22: Calculating a correction coefficient of the ambient temperature according to the current ambient temperature and the current actual ambient temperature; S23: Calculating the expected ambient temperature within a preset time in the future according to the ambient temperature table and the correction coefficient of the ambient temperature.

3. The high temperature discharge prevention control method for the energy storage system according to claim 2, characterized in that: Step S3 specifically includes: S31: Acquire temperature rise data of the energy storage inverter, wherein the temperature rise data of the energy storage inverter includes a temperature change value of the energy storage inverter in a preset unit time under different ambient temperatures and different overall working plans; S32: Determine the temperature change value of the energy storage inverter in each preset unit time in the future preset time according to the temperature rise data of the energy storage inverter, the expected ambient temperature in the future preset time, and the overall work plan of the energy storage inverter; S33: According to the current energy storage inverter temperature and the temperature change value of the energy storage inverter in each preset unit time period in the future preset time, determine each expected energy storage inverter temperature at each preset unit time interval from the current moment to the future preset time, wherein the expected energy storage inverter temperature refers to the estimated value of the energy storage inverter temperature after the preset unit time.

4. The high temperature discharge prevention control method for the energy storage system according to claim 3, characterized in that: In step S4, determining whether there is a moment in the future preset time when the energy storage inverter temperature is expected to be greater than the energy storage inverter temperature protection value includes: It is determined whether the predicted energy storage inverter temperatures at each preset unit time interval from the current moment to the future preset time have values ​​greater than the energy storage inverter temperature protection value. If so, it means that there is a moment in the future preset time when the predicted energy storage inverter temperature is greater than the energy storage inverter temperature protection value.

5. The high temperature discharge prevention control method of the energy storage system according to claim 1, characterized in that: In step S4, adjusting the overall working plan of the energy storage inverter within a preset future time includes: A1: Obtaining the priority and first threshold of each relay connected to the energy storage inverter, where the first threshold refers to the upper limit of the relay level that needs to be guaranteed to work; A2: gradually adjusting the working plan of the loads corresponding to the relays connected to the energy storage inverter and having a priority lower than the first threshold within a future preset time, to obtain an adjusted overall working plan of the energy storage inverter within a future preset time; A3: Calculate the estimated energy storage inverter temperature after adjustment within the future preset time according to the overall work plan of the energy storage inverter within the future preset time after adjustment, the temperature rise data of the energy storage inverter, the current energy storage inverter temperature, and the estimated ambient temperature within the future preset time; A4: Determine whether there is a moment in the future preset time when the adjusted expected energy storage inverter temperature is greater than the energy storage inverter temperature protection value. If so, return to step A2; if not, control each relay according to the overall work plan of the energy storage inverter in the future preset time after the adjustment.

6. The high temperature discharge prevention control method for the energy storage system according to claim 5, characterized in that: Step A2 specifically includes: adjusting the working plans of loads corresponding to a preset number of relays connected to the energy storage inverter and having a priority lower than the first threshold within a preset future time, and obtaining an adjusted overall working plan of the energy storage inverter within the preset future time.

7. The high temperature discharge prevention control method of the energy storage system according to claim 6, characterized in that: In the process of gradually adjusting the working plan of the load corresponding to the relay connected to the energy storage inverter with a priority lower than the first threshold within the future preset time, priority is given to adjusting the working plan of the load corresponding to the relay connected to the energy storage inverter with a lower priority within the future preset time; in the case of equal relay priorities, priority is given to adjusting the working plan of the load corresponding to the relay closest to the current moment.

8. The high temperature discharge prevention control method for the energy storage system according to claim 5, characterized in that: Step A4 specifically includes: A41: Determine whether there is a moment in the future preset time when the adjusted estimated energy storage inverter temperature is greater than the energy storage inverter temperature protection value, if yes, execute step A42, if no, execute step A43; A42: Determine whether the work plan of the loads corresponding to all relays connected to the energy storage inverter with a priority lower than the first threshold within the preset future time has been adjusted, if yes, execute step A43, if no, return to step A2; A43: Control each relay according to the overall working plan of the energy storage inverter within the adjusted future preset time.

9. An energy storage system, characterized in that: It includes an energy storage battery, a bidirectional DC unit, a unidirectional DC unit, an energy storage inverter and a load distribution unit, the energy storage battery is connected to the bidirectional DC unit, the unidirectional DC unit and the bidirectional DC unit are respectively connected to the DC side of the energy storage inverter, the AC side of the energy storage inverter is connected to the load distribution unit, the load distribution unit includes a plurality of relays and a plurality of loads, each of the relays is respectively connected to each of the loads, the energy storage inverter is communicatively connected to the load distribution unit, and each of the relays is controlled by the high-temperature discharge protection control method of the energy storage system according to any one of claims 1 to 8.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, wherein the computer program is configured to be executable by a processor to execute the high-temperature discharge prevention control method for the energy storage system according to any one of claims 1 to 8.

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