Control method and system for cold start of energy storage system

Abstract

To provide a control method and a system for cold start of an energy storage system.SOLUTION: In a method, in S1, the internal temperature, actual external temperature, and predicted external temperature of an energy storage system are collected in real time. In S2, a plurality of consecutive or equally spaced collection points are extracted from the real-time temperature collection, and internal temperature curves, actual external temperature curves, and predicted external temperature curves of the energy storage system are established. On the basis of the change trends of these three curves, low temperature alarms, including a warehouse temperature alarm and an outdoor temperature alarm, are issued. In S3, on the basis of the current internal temperature and low temperature alarm of the energy storage system, one of a plurality of heating methods, including first-class heating, second-class heating, and third-class heating, is selected to perform internal heating of the energy storage system.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to the field of container-type energy storage system technology, and in particular to a control method and system for cold start-up of an energy storage system. [Background technology]

[0002] With the development of science and technology, battery energy storage systems are now more widely used, playing an important role especially in the fields of new energy and energy saving technology. A container-type energy storage system is one type of battery energy storage system, and mainly includes an electrical storage and a battery storage, which are used for electrical control of the energy storage system and energy storage work respectively.

[0003] In the energy storage device thermal management system, method, and energy storage device disclosed in publication number CN11674208A, a heating membrane is installed to divide the system into multiple independent heating zones, and the different zones are individually heated based on the detected internal temperature of the system.The above solution only heats the battery warehouse, and no heating assembly or control assembly for the heating assembly is installed in the electrical warehouse, so in the low-temperature outdoor working environment of northern regions, the electrical equipment in the electrical warehouse may not be able to start or operate normally, and the power supply circuits of the energy storage system may not be able to supply power.

[0004] In the above situation, the prior art is equipped with a temperature detection circuit, which automatically connects the relevant control circuit when the temperature inside the system becomes extremely low, and after the operation of the direct start-up at extremely low temperature, turns on the heater and fan, and the heater and fan work together to rapidly heat up. However, this method can only heat up at extremely low temperature start-up, and it is not possible to predict the temperature. Furthermore, during the direct start-up operation, the heating component is overloaded at the moment of start-up, which is likely to generate a shock current and shock the circuit. To return to the automatic operation state, it is necessary to manually reset it, otherwise it will not work normally. Summary of the Invention [Problem to be solved by the invention]

[0005] In view of this, the present invention proposes a control method and system for low-temperature start-up of an energy storage system, which, through three measures of low-temperature alarm prevention control, low-temperature heating, and gradual start-up of electrical equipment, ensures that the environmental temperature of the electrical warehouse reaches the optimal operating temperature of the electrical equipment in the warehouse, and avoids the direct start-up operation from imposing too much load at the moment of start-up, which affects the normal operation of the electrical circuit of the heating component. [Means for solving the problem]

[0006] The technical solution of the present invention is realized as follows:

[0007] In one aspect, the present invention provides a control method for cold start-up of an energy storage system, the method comprising: S1. Collecting the internal temperature, the external actual temperature and the external predicted temperature of the energy storage system in real time; S2. Extract multiple consecutive or equal time interval sampling points from the real-time temperature sampling, establish the internal temperature curve, external actual temperature curve and external predicted temperature curve of the energy storage system, and issue low temperature alarms, including warehouse temperature alarms and outdoor temperature alarms, according to the change trends of these three curves; S3. Selecting one of a plurality of heating methods, including first-class heating, second-class heating, and third-class heating, based on the current internal temperature of the energy storage system and the low temperature warning, to perform internal heating of the energy storage system; S4. Setting a normal temperature threshold, and canceling the heating when the internal temperature of the energy storage system reaches the normal temperature threshold during heating; otherwise, maintaining the current heating mode; S5. Setting a plurality of preset startup electrical equipment sets, and setting startup temperature thresholds for the corresponding preset startup electrical equipment sets; determining that, during internal heating of the energy storage system, if the internal temperature of the energy storage system is lower than the minimum value among the plurality of startup temperature thresholds, none of the electrical equipment in the preset startup electrical equipment sets will start; and, when the internal temperature of the energy storage system reaches a startup temperature threshold, the electrical equipment in the preset startup electrical equipment set corresponding to the startup temperature threshold can start, wherein the preset startup electrical equipment set includes a plurality of electrical equipment in the energy storage system.

[0008] Based on the above technical solution, preferably, step S2 comprises: S21. forming an internal temperature linear trend line based on the internal temperature curve of the energy storage system, and calculating a slope K1 of the internal temperature linear trend line; S22, set a first slope threshold, and if the slope K1 is greater than the first slope threshold and the temperature of the last sampling point of the internal temperature curve of the energy storage system is greater than the normal temperature threshold, determine that there is no low temperature trend; if the slope K1 is greater than the first slope threshold and the temperature of the last sampling point of the internal temperature curve of the energy storage system is less than the normal temperature threshold, the low temperature warning is the warehouse temperature warning; if the slope K1 is not greater than the first slope threshold, proceed to step S23; S23. forming an external actual temperature linear trend line based on the external actual temperature curve, and calculating a slope K2 of the external actual temperature linear trend line; S24, setting a second slope threshold, and if the slope K2 is greater than the second slope threshold, determining that there is no tendency for the temperature to be low, and if the slope K2 is not greater than the second slope threshold, proceeding to step S25; S25. Obtaining an external predicted temperature linear trend line of the external predicted temperature curve, and calculating a slope K3 of the external predicted temperature linear trend line; S26: if the gradient K3 is greater than the gradient K2, it is determined that there is no tendency for the temperature to be low, and if the gradient K3 is not greater than the gradient K2, the low temperature warning issued is the outdoor temperature warning.

[0009] According to the above technical solution, preferably, in step S3, selecting one of a plurality of heating methods to perform internal heating of the energy storage system based on the current internal temperature of the energy storage system: Setting a plurality of heating activation temperature ranges corresponding one-to-one to a plurality of heating methods, and when the internal temperature of the current energy storage system reaches a certain heating activation temperature range, heating the inside of the energy storage system using the corresponding heating method.

[0010] Further preferably, in step S3, selecting one of a plurality of heating methods to perform internal heating of the energy storage system based on a low temperature alarm includes: When the low temperature alarm is the warehouse temperature alarm, the heating method adopted is the second level heating, and when the low temperature alarm is the outdoor temperature alarm, the heating method adopted is the first level heating.

[0011] More preferably, the first, second, and third heating levels in the heating method are arranged in order of priority from lowest to highest, If the low temperature alarm is the warehouse temperature alarm and the current internal temperature of the energy storage system meets the first-level heating conditions, trigger the first-level heating and the second-level heating to heat the internal temperature of the energy storage system using a heating method with a higher priority; If the low temperature alarm is the warehouse temperature alarm and the current internal temperature of the energy storage system meets the conditions for the third-level heating, trigger the third-level heating and the second-level heating, and use a heating method with a higher priority to heat the internal temperature of the energy storage system; When the low-temperature alarm is the outdoor temperature alarm and the internal temperature of the current energy storage system meets the conditions of the secondary heating or the tertiary heating, trigger the primary heating and the secondary heating or the tertiary heating, and perform internal heating of the energy storage system in a heating method with a higher priority.

[0012] Based on the above technical solution, preferably, the plurality of preset starting electrical component sets include a primary starting electrical component set, a secondary starting electrical component set, and a tertiary starting electrical component set. The starting temperature thresholds of the corresponding preset starting electrical component sets include a primary starting temperature threshold, a secondary starting temperature threshold, and a tertiary starting temperature threshold. The primary starting electrical component set, the secondary starting electrical component set, and the tertiary starting electrical component set respectively correspond to the primary starting temperature threshold, the secondary starting temperature threshold, and the tertiary starting temperature threshold. The secondary starting electrical component set includes all the electrical components in the primary starting electrical component set, and the tertiary starting electrical component set includes all the electrical components in the secondary starting electrical component set.

[0013] More preferably, the heating start temperature range of the primary heating is 0°C < T1 ≤ 5°C, the heating start temperature range of the secondary heating is -10°C < T1 ≤ 0°C, and the heating start temperature range of the tertiary heating is -30°C < T1 ≤ -10°C.

[0014] In another aspect, the present invention provides a control system for low-temperature startup of an energy storage system. The system includes a temperature acquisition module, a heating module, a main control module, and a heating current acquisition module. The temperature acquisition module is used to collect the internal temperature, the external actual temperature, and the external predicted temperature of the energy storage system in real time. The heating module is used to heat the inside of the energy storage system. The heating module includes various heating methods. the main control module incorporates the above control method, and is used to receive the collected data from the temperature collection module, control the heating mode of the heating module according to the temperature data, and start the corresponding electrical components in the preset start-up electrical component set according to the temperature data; The heating current collecting module is used to collect the working current of the heating module and transmit the working current data of the heating module in different heating modes to the main control module.

[0015] According to the above technical solution, preferably, further includes a starting current collecting module; The starting current collecting module is used to collect the current signal of the circuit formed by the electrical components in the preset starting electrical component set, and feed it back to the main control module.

[0016] More preferably, the main control module checks whether the corresponding electrical equipment circuit has started up normally based on the current signal fed back from the startup current collection module, and transmits a startup success signal if the corresponding electrical equipment circuit has started up normally, or transmits a startup failure signal if the corresponding electrical equipment circuit has not started up normally. [Effects of the Invention]

[0017] The control method and system for cold start-up of an energy storage system of the present invention has the following beneficial effects over the prior art:

[0018] (1) By extracting multiple consecutive or equally spaced sampling points from the real-time temperature sampling, the internal temperature curve, external actual temperature curve, and external predicted temperature curve of the energy storage system are established, and a low temperature alarm is issued based on the change trends of these three curves. Based on the current internal temperature of the energy storage system and the low temperature alarm, one of multiple heating methods is selected to heat the internal temperature of the energy storage system. The local real-time temperature and the future temperature are combined, and a low temperature alarm is issued when the temperature continues to drop, thereby avoiding problems such as a sudden drop in the temperature inside the electrical warehouse, the constant opening and closing of the heating equipment, and the difficulty of maintaining the temperature inside the electrical warehouse.

[0019] (2) The first and second slope thresholds are set to judge the change trends of the three curves of the energy storage system, i.e., the internal temperature curve, the external actual temperature curve, and the external predicted temperature curve, and then combine them with the actual temperature to issue a low temperature warning, realize early heating, and prevent the temperature from dropping below the normal value too quickly and being unable to maintain the current temperature.

[0020] (3) By installing various heating methods, performing step-by-step heating, and matching the optimal heating method for the current situation, it is possible to avoid repeated opening and closing of the heating components, which results in large energy losses, and at the same time, it is possible to avoid excessive load at the moment of starting when the heating components are directly started, which would affect the normal operation of the electrical circuit.

[0021] (4) By starting up the electrical equipment in stages, when the energy storage system starts up at a low temperature and the interior is in a heated state, it ensures that the ambient temperature of the electrical warehouse reaches the optimal operating temperature of the electrical equipment inside the warehouse. [Brief explanation of the drawings]

[0022] In order to more clearly describe the technical solutions in the embodiments of the present invention or the prior art, the following will briefly describe the drawings that need to be used in the description of the embodiments or the prior art. Of course, the drawings in the following description are only a part of the embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative work. [Figure 1] FIG. 2 is a step schematic diagram of a control method for cold start-up of an energy storage system according to the present invention. [Figure 2] 1 is a structural schematic diagram of a control system for low temperature start-up of an energy storage system according to the present invention; FIG. [Figure 3] FIG. 2 is a local structural schematic diagram of a control system for low temperature start-up of an energy storage system according to the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0023] The following provides a clear and complete description of the technical solutions in the embodiments of the present invention using the embodiments of the present invention, but it is clear that the described embodiments are only a part of the embodiments of the present invention and are not all of them. Based on the embodiments of the present invention, all other embodiments that can be obtained by those skilled in the art without any creative efforts shall fall within the scope of protection of the present invention.

[0024] As shown in FIGS. 1-3, the control system for low temperature start-up of the energy storage system of the present invention includes a temperature collection module, a heating module and a main control module.

[0025] The temperature collection module is used to collect the internal temperature, actual external temperature, and predicted external temperature of the energy storage system in real time. Specifically, the temperature collection module includes several temperature sensors and a data receiving unit, the temperature sensors are installed on the body of the container of the energy storage system, one of which is an internal temperature sensor 2 installed inside the container, and one of which is an external temperature sensor 1 installed outside the container, which are used to collect the internal temperature and external actual temperature of the energy storage system respectively, and the predicted external temperature receives weather data through the data receiving unit to obtain the weather conditions at the location of the energy storage system.

[0026] The weather conditions at the location of the energy storage system are monitored by the station control layer and then transmitted to the data receiving unit. The weather conditions data at this location includes the local temperature change conditions within the next six hours, and provides information support for subsequent low temperature warnings.

[0027] The heating module is used to heat the inside of the energy storage system, and the heating module includes a plurality of heating modes, which are first-grade heating, second-grade heating, and third-grade heating, respectively, where the first-grade heating, second-grade heating, and third-grade heating correspond to the operating states of the heating module at different temperatures or different temperature forecasts in the electric warehouse after the energy storage system is started up.

[0028] Specifically, as shown in Figure 3, the heating module includes a semiconductor heating and cooling integrated device 5, a liquid cooling plate 4, and a PTC heating film 6 installed in the electric warehouse of the energy storage system. When the heating module is in non-heating mode, the semiconductor heating and cooling integrated device 5, the liquid cooling plate 4, and the PTC heating film 6 do not operate. When the heating module is in the first-level heating mode, only the semiconductor heating and cooling integrated device 5 heats. When the heating module is in the second-level heating mode, the semiconductor heating and cooling integrated device 5 heats, and the liquid cooling unit connected to the liquid cooling plate 4 operates at 50% power. When the heating module is in the third-level heating mode, the semiconductor heating and cooling integrated device 5 heats simultaneously with the PTC heating film 6, and the liquid cooling unit connected to the liquid cooling plate 4 operates at full power.

[0029] The main control module receives the data collected by the temperature collection module, controls the heating mode of the heating module according to the temperature data, and starts the corresponding electrical components in the preset starting electrical component set according to the temperature data. The main control module is a BMS management system in the energy storage system, and can perform temperature trend analysis on the temperature data and control the heating mode of the heating module based on the real-time internal temperature of the energy storage system. The multiple preset starting electrical component sets are respectively a first-class starting electrical component set, a second-class starting electrical component set, and a third-class starting electrical component set. The first-class starting electrical component set includes an isolating switch, a fuse, a surge fuse, and a surge protection device. The second-class starting electrical component set includes devices such as a circuit breaker, a switch power supply, a temperature control switch, a water ingress sensor, and all the electrical components in the first-class starting electrical component set. The third-class starting electrical component set includes all the preset starting electrical components in the electrical storage.

[0030] After the internal temperature of the electric warehouse of the energy storage system reaches a start-up temperature range corresponding to a preset start-up electric equipment set, the electric equipment in the preset start-up electric equipment set can be set to a start-up enabled state, but conversely, the electric equipment can be set to a start-up disabled state.

[0031] In this embodiment, a heating current collection module is further installed, which is used to collect the operating current of the heating module and transmit the operating current data of the heating module in different heating modes to the main control module. The heating current collection module includes several Hall sensors 3. When the heating module is operating, it employs multiple heating devices, and the differences in the heating modes are whether the heating devices are activated and their operating power. The installed Hall sensors 3 monitor the operating current of each heating device, determine whether its real-time power falls within the range specified for the corresponding heating mode, and determine whether the operating mode of the heating module is correct and operating normally. The main control module can adjust the overall heating power of the heating module based on the feedback current signal.

[0032] In this embodiment, a startup current collection module is further provided, which is used to collect current signals from the circuits formed by the electrical components in the preset startup electrical component set and provide feedback to the main control module. After the main control module determines whether the preset startup electrical component set can be started based on the real-time temperature inside the energy storage system, the corresponding electrical components can be started and form circuits, and the electrical components in the first-class electrical component start-up set, the second-class electrical component start-up set, and the third-class electrical component start-up set can form first-class electrical circuits, second-class electrical circuits, and third-class electrical circuits, respectively. The startup current collection module includes several current sensors, which collect current information from the first-class electrical circuits, second-class electrical circuits, and third-class electrical circuits and transmit the information to the main control module. The current information data can be used to determine whether the corresponding electrical component circuits are running normally.

[0033] The main control module checks whether the corresponding electrical equipment circuit has started up normally based on the current signal fed back from the startup current collection module, and if it has started up normally, it sends out a startup success signal, and if it has not started up normally, it sends out a startup failure signal.

[0034] In addition, when the heating module heats, it is necessary to install a flow meter at the water inlet / outlet of the liquid cooling plate 4 and a temperature probe on the liquid cooling plate 4 to detect its heating efficiency, thereby providing feedback on its operating status.

[0035] As shown in FIG. 1, the control method for low temperature startup of an energy storage system of the present invention includes steps S1 to S5.

[0036] In step S1, the internal temperature, the external actual temperature and the external predicted temperature of the energy storage system are collected in real time.

[0037] The internal temperature and external actual temperature of the energy storage system can be directly collected by the built-in and external temperature sensors installed in the energy storage system container, and the external predicted temperature is obtained by weather forecasting by the station control layer. The internal temperature of the energy storage system is data directly related to the electrical storage and can directly serve as basic data for the gradual start-up of heating and electrical equipment. The external actual temperature and external predicted temperature are related to the internal temperature of the energy storage system, and changes or possible changes in the external actual temperature and external predicted temperature indirectly affect the internal temperature of the energy storage system, and the internal temperature of the energy storage system can be predicted through the external actual temperature and external predicted temperature.

[0038] In step S2, a plurality of consecutive or equally spaced sampling points are extracted from the real-time temperature sampling, and an internal temperature curve, an external actual temperature curve, and an external predicted temperature curve of the energy storage system are established. Based on the change trends of these three curves, a low temperature alarm is issued, and the low temperature alarm includes a warehouse temperature alarm and an outdoor temperature alarm.

[0039] In one specific embodiment, sampling points are taken at 10-minute intervals to form an internal temperature curve and an external actual temperature curve of the energy storage system that are updated every 10 minutes, each curve having six sampling points, and the last point of the internal temperature curve and the external actual temperature curve of the energy storage system is not the real-time temperature, and the external predicted temperature curve is the predicted temperature within the next six hours at the location of the energy storage system.

[0040] Specifically, step S2 includes sub-steps S21 to S26.

[0041] In step S21, an internal temperature linear trend line is formed based on the internal temperature curve of the energy storage system, and the slope K1 of the internal temperature linear trend line is calculated.

[0042] The slope K1 of the internal temperature linear trend line obtained in this step represents the temperature change status of the internal temperature within one hour, and the slope can represent the predicted subsequent change status of the internal temperature of the energy storage system.

[0043] In step S22, a first slope threshold is set, and if the slope K1 is greater than the first slope threshold and the temperature at the last sampling point of the internal temperature curve of the energy storage system is greater than the normal temperature threshold, it is determined that there is no low temperature trend; if the slope K1 is greater than the first slope threshold and the temperature at the last sampling point of the internal temperature curve of the energy storage system is less than the normal temperature threshold, the low temperature warning is a warehouse temperature warning; if the slope K1 is not greater than the first slope threshold, proceed to step S23.

[0044] Before this step, a temperature normal threshold needs to be set to determine whether the temperature in the electric warehouse of the energy storage system is above the temperature normal threshold, thereby ensuring the normal operation of the electric warehouse.

[0045] In one specific embodiment, the first slope threshold is set to -0.5, and if the slope K1 is greater than the first slope threshold, it indicates that the internal temperature of the energy storage system is decreasing or increasing at a slow rate. In this case, the internal temperature will not drop sharply, but heating operation is required even if the temperature inside the electric storage is lower than the normal temperature threshold. Conversely, if the slope K1 is not greater than the first slope threshold, it indicates that the temperature is decreasing too quickly, and temperature prediction is required based on the external temperature to prevent the temperature from continuing to drop below the normal temperature threshold.

[0046] In step S23, a linear trend line of the actual external temperature is formed based on the actual external temperature curve, and the slope K2 of the linear trend line of the actual external temperature is calculated.

[0047] Accordingly, the slope K2 represents the temperature change situation of the external temperature of the energy storage system within one hour, and the slope can represent the prediction of the subsequent change situation of the external temperature of the energy storage system.

[0048] In step S24, a second slope threshold is set, and if the slope K2 is greater than the second slope threshold, it is determined that there is no tendency for the temperature to be low, and if the slope K2 is not greater than the second slope threshold, the process proceeds to step S25.

[0049] In one specific embodiment, the second slope threshold is set to 0, that is, it is determined whether the external actual temperature has a downward trend in a short period of time. If there is a downward trend, it indicates that the external temperature of the energy storage system may affect the decrease in the internal temperature of the energy storage system; conversely, it indicates that there is no effect on the decrease in the internal temperature of the energy storage system, and at this time it is determined that there is no low temperature trend.

[0050] In step S25, the external predicted temperature linear trend line of the external predicted temperature curve is obtained, and the slope K3 of the external predicted temperature linear trend line is calculated.

[0051] The slope K3 represents the change in the external weather temperature, and the trend of the external temperature can be judged based on the slope K3, and it can be determined whether the external temperature will rise or fall in the future.

[0052] In step S26, if the slope K3 is greater than the slope K2, it is determined that there is no tendency for the temperature to be low, and if the slope K3 is not greater than the slope K2, the low temperature warning issued is an outdoor temperature warning.

[0053] If the slope K3 is greater than the slope K2, it indicates that within a certain period of time, the rate of drop of the external ambient temperature will not be greater than the rate of drop of the temperature one hour prior to the current time, and there is no situation in which the temperature drops suddenly. In this case, it is determined that the temperature drops gradually and is controllable, and there is no tendency for the temperature to drop low. In this case, the internal temperature of the energy storage system can be lowered below the normal temperature threshold before heating. If the slope K3 is not greater than the slope K2, it indicates that the subsequent drop in the external temperature will be relatively rapid, and there will be a certain delay in the temperature conduction from the outside to the energy storage system, and therefore the low temperature alarm issued at this time is an outdoor temperature alarm.

[0054] In step S3, based on the current internal temperature of the energy storage system and the low temperature alarm, one of a plurality of heating methods including first-class heating, second-class heating, and third-class heating is selected to perform internal heating of the energy storage system.

[0055] In this step, it is necessary to set multiple heating start-up temperature ranges that correspond one-to-one to multiple heating methods, and when the internal temperature of the current energy storage system reaches a certain heating start-up temperature range, the internal heating of the energy storage system is performed using the corresponding heating method.

[0056] In a specific embodiment, the plurality of heating start temperature ranges are three temperature intervals. If the real-time temperature in the electric warehouse is T1, the heating start temperature range of the corresponding primary heating is 0°C < T1 ≤ 5°C, the heating start temperature range of the corresponding secondary heating is -10°C < T1 ≤ 0°C, and the heating start temperature range of the corresponding tertiary heating is -30°C < T1 ≤ -10°C. That is, after the temperature reaches the corresponding range, the corresponding heating method is adopted to heat the electric warehouse of the energy storage system.

[0057] Based on the low-temperature alarm, selecting one of the plurality of heating methods to perform internal heating of the energy storage system includes that when the low-temperature alarm is a warehouse internal temperature alarm, the adopted heating method is secondary heating, and when the low-temperature alarm is an outdoor temperature alarm, the adopted heating method is primary heating.

[0058] In one specific embodiment, the current temperature inside the warehouse is 3°C, and the issued low-temperature alarm is a warehouse internal temperature alarm. However, the temperature belongs to the range of 0°C < T1 ≤ 5°C. That is, to avoid problems such as the heating method corresponding to the low-temperature alarm being level 2 heating, but the heating method must be level 1 heating according to the actual temperature, the level 1 heating, level 2 heating, and level 3 heating of the heating method are arranged in order from the lowest priority to the highest priority. When the low-temperature alarm is a warehouse internal temperature alarm and the current internal temperature of the energy storage system meets the conditions of level 1 heating, trigger level 1 heating and level 2 heating, and perform internal heating of the energy storage system with a heating method of higher priority. When the low-temperature alarm is a warehouse internal temperature alarm and the current internal temperature of the energy storage system meets the conditions of level 3 heating, trigger level 3 heating and level 2 heating, and perform internal heating of the energy storage system with a heating method of higher priority. When the low-temperature alarm is an outdoor temperature alarm and the current internal temperature of the energy storage system meets the conditions of level 2 heating or level 3 heating, trigger level 1 heating and level 2 heating or level 3 heating, and perform internal heating of the energy storage system with a heating method of higher priority. That is, when the above situation occurs, if two different heating methods are triggered according to the low-temperature alarm and the internal temperature of the energy storage system, perform the heating operation inside the electric warehouse with the heating method of higher priority.

[0059] In step S4, set the temperature normal threshold. When the internal temperature of the energy storage system reaches the temperature normal threshold during heating, cancel the heating; otherwise, maintain the current heating method.

[0060] Among multiple heating methods, heat the inside of the electric warehouse. However, during heating, since the slope K1 is positive, maintain the determination that there is no low-temperature tendency until the electric warehouse temperature reaches the temperature normal threshold. After the electric warehouse temperature reaches the temperature normal threshold, cancel the heating.

[0061] In one specific embodiment, after the energy storage system is activated, the heating method of the electric warehouse becomes third-level heating. After the internal temperature is heated to the normal temperature threshold, the heating stops. At this time, if the internal temperature of the electric warehouse drops, it can be switched to first-level heating or switched to second-level heating based on the warehouse temperature alarm of the alarm signal.

[0062] In step S5, a plurality of preset starting electrical components sets are set, and the starting temperature thresholds of the corresponding preset starting electrical components sets are set. During the internal heating of the energy storage system, if the internal temperature of the energy storage system is lower than the minimum value among the plurality of starting temperature thresholds, the electrical components in all the preset starting electrical components sets do not start. When the internal temperature of the energy storage system reaches a certain starting temperature threshold, it is determined that the electrical components in the preset starting electrical components set corresponding to this starting temperature threshold can start. The preset starting electrical components set includes a plurality of electrical components of the energy storage system.

[0063] The plurality of preset starting electrical components sets include a first-level starting electrical components set, a second-level starting electrical components set, and a third-level starting electrical components set. The starting temperature thresholds of the corresponding preset starting electrical components sets include a first-level starting temperature threshold, a second-level starting temperature threshold, and a third-level starting temperature threshold. The first-level starting electrical components set, the second-level starting electrical components set, and the third-level starting electrical components set respectively correspond to the first-level starting temperature threshold, the second-level starting temperature threshold, and the third-level starting temperature threshold. The second-level starting electrical components set includes all the electrical components in the first-level starting electrical components set. The third-level starting electrical components set includes all the electrical components in the second-level starting electrical components set.

[0064] In this embodiment, when the temperature in the warehouse is T1 and T1 ≤ -40°C, all the preset electrical components do not start. When -40°C < T1 ≤ -10°C, the electrical components in the first-level starting electrical components set can start. When -10°C < T1 ≤ 0°C, the electrical components in the second-level starting electrical components set can start. When 0°C < T1, the electrical components in the third-level starting electrical components set can start. That is, the first-level starting temperature threshold, the second-level starting temperature threshold, and the third-level starting temperature threshold are -40°C, -10°C, and 0°C respectively.

[0065] The control system also incorporates the control method to help provide low temperature warning, staged heating, and staged start-up.

[0066] The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. 1. A control method for cold start of an energy storage system, comprising: S1. Collecting the internal temperature, the external actual temperature, and the external predicted temperature of the energy storage system in real time; S2. Extract multiple consecutive sampling points with equal time intervals from the real-time temperature sampling, and establish the internal temperature curve, external actual temperature curve and external predicted temperature curve of the energy storage system; and determine that there is no low temperature trend or issue a low temperature warning, including a warehouse temperature warning and an outdoor temperature warning, based on the change trends of these three curves; S3. Select one of a plurality of heating methods, including first-class heating, second-class heating, and third-class heating, based on the current internal temperature of the energy storage system and the low temperature warning, to perform internal heating of the energy storage system; S4. Setting a temperature normal threshold, and canceling the heating when the internal temperature of the energy storage system reaches the temperature normal threshold during heating; otherwise, maintaining the current heating mode; S5. Setting a plurality of preset activation electrical equipment sets, setting activation temperature thresholds for the corresponding preset activation electrical equipment sets, determining that when the internal temperature of the energy storage system is lower than the minimum value among the plurality of activation temperature thresholds during internal heating of the energy storage system, none of the electrical equipment in the preset activation electrical equipment sets will be activated, and when the internal temperature of the energy storage system reaches a certain activation temperature threshold, the electrical equipment in the preset activation electrical equipment set corresponding to the activation temperature threshold can be activated, wherein the preset activation electrical equipment set includes a plurality of electrical equipment in the energy storage system. A control method for low temperature start-up of an energy storage system, comprising:

2. Step S2 S21. Based on the internal temperature curve of the energy storage system, generate an internal temperature linear trend line and calculate a slope K1 of the internal temperature linear trend line; S22, set a first slope threshold, and determine that there is no low temperature trend if the slope K1 is greater than the first slope threshold and the temperature at the last sampling point of the internal temperature curve of the energy storage system is greater than the normal temperature threshold; if the slope K1 is greater than the first slope threshold and the temperature at the last sampling point of the internal temperature curve of the energy storage system is less than the normal temperature threshold, the low temperature warning is the warehouse temperature warning; if the slope K1 is not greater than the first slope threshold, proceed to step S23; S23. forming an external actual temperature linear trend line based on the external actual temperature curve, and calculating a slope K2 of the external actual temperature linear trend line; S24: setting a second slope threshold, and if the slope K2 is greater than the second slope threshold, determining that there is no tendency for the temperature to be low, and if the slope K2 is not greater than the second slope threshold, proceeding to step S25; S25. Obtaining an external predicted temperature linear trend line of the external predicted temperature curve, and calculating a slope K3 of the external predicted temperature linear trend line; S26, if the gradient K3 is greater than the gradient K2, it is determined that there is no tendency for the temperature to be low, and if the gradient K3 is not greater than the gradient K2, the low temperature warning issued is the outdoor temperature warning.

2. The control method for low temperature start-up of an energy storage system according to claim 1.

3. In step S3, selecting one of a plurality of heating methods to heat the inside of the energy storage system based on the current internal temperature of the energy storage system includes: setting a plurality of heating activation temperature ranges corresponding one-to-one to a plurality of heating methods, and when the internal temperature of the current energy storage system reaches a certain heating activation temperature range, heating the inside of the energy storage system by a corresponding heating method; 2. The control method for low temperature start-up of an energy storage system according to claim 1.

4. In step S3, selecting one of a plurality of heating methods to perform internal heating of the energy storage system based on a low temperature warning includes: When the low temperature alarm is the warehouse temperature alarm, the heating method to be adopted is the second level heating, and when the low temperature alarm is the outdoor temperature alarm, the heating method to be adopted is the first level heating.

4. The control method for low temperature start-up of an energy storage system according to claim 3.

5. The first, second, and third heating levels in the heating method are arranged in order of priority from lowest to highest, If the low temperature alarm is the warehouse temperature alarm and the current internal temperature of the energy storage system meets the first-level heating condition, trigger the first-level heating and the second-level heating to heat the internal temperature of the energy storage system using a heating method with a higher priority; If the low temperature alarm is the warehouse temperature alarm and the current internal temperature of the energy storage system meets the conditions for the third-level heating, trigger the third-level heating and the second-level heating, and use a heating method with a higher priority to heat the internal temperature of the energy storage system; If the low temperature alarm is the outdoor temperature alarm and the current internal temperature of the energy storage system meets the conditions for the second-level heating or the third-level heating, trigger the first-level heating and the second-level heating or the third-level heating, and use a heating method with a higher priority to heat the internal temperature of the energy storage system; 5. The control method for low temperature start-up of an energy storage system according to claim 4.

6. The plurality of preset starting electrical equipment sets include a first class starting electrical equipment set, a second class starting electrical equipment set, and a third class starting electrical equipment set, and the starting temperature thresholds of the corresponding preset starting electrical equipment sets include a first class starting temperature threshold, a second class starting temperature threshold, and a third class starting temperature threshold, and the first class starting electrical equipment set, the second class starting electrical equipment set, and the third class starting electrical equipment set correspond to the first class starting temperature threshold, the second class starting temperature threshold, and the third class starting temperature threshold, respectively, and the second class starting electrical equipment set includes all the electrical equipment in the first class starting electrical equipment set, and the third class starting electrical equipment set includes all the electrical equipment in the second class starting electrical equipment set.

2. The control method for low temperature start-up of an energy storage system according to claim 1.

7. The heating start temperature range of the first-class heating is 0°C<T1≦5°C, the heating start temperature range of the second-class heating is -10°C<T1≦0°C, and the heating start temperature range of the third-class heating is -30°C<T1≦-10°C.

4. The control method for low temperature start-up of an energy storage system according to claim 3.

8. 1. A control system for cold start-up of an energy storage system, comprising: a temperature acquisition module, a heating module, a main control module, and a heating current acquisition module, The temperature collection module is used to collect the internal temperature, the external actual temperature, and the external predicted temperature of the energy storage system in real time; The heating module is used to heat the inside of the energy storage system, and the heating module includes a plurality of heating methods; The main control module incorporates the control method of any one of claims 1 to 7, and is used to receive the collected data of the temperature collection module, control the heating mode of the heating module based on the temperature data, and start up the corresponding electrical components in the preset start-up electrical component set based on the temperature data; The heating current collecting module is used to collect the working current of the heating module and transmit the working current data of the heating module in different heating modes to the main control module; 1. A control system for cold start-up of an energy storage system, comprising:

9. further comprising a starting current collecting module; The starting current collecting module is used to collect the current signal of the circuit formed by the electrical components in the preset starting electrical components set, and feed it back to the main control module; 9. The control system for cold start-up of an energy storage system according to claim 8.

10. The main control module checks whether the corresponding electrical equipment circuit is started up normally based on the current signal fed back from the start-up current collecting module, and sends a start-up success signal if the corresponding electrical equipment circuit is started up normally, or sends a start-up failure signal if the corresponding electrical equipment circuit is not started up normally.

10. The control system for cold start-up of an energy storage system according to claim 9.

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