Charging and discharging control method of energy storage system, energy storage system and storage medium

Abstract

The application discloses a charging and discharging control method of an energy storage system, the energy storage system and a storage medium. The method comprises the following steps: determining a charging period and a discharging period of the energy storage system; when the working time of the energy storage system is located before the charging period and the temperature of the energy storage battery is located in a first temperature interval, controlling the charging of the energy storage battery in the charging period; when the working time of the energy storage system is located before the discharging period and the temperature of the energy storage battery is located in a second temperature interval, controlling the irregular charging and discharging of the energy storage battery in the charging and discharging period, the second temperature interval is greater than the first temperature interval, and the problem that the charging and discharging efficiency of the energy storage battery is low is optimized, so that the charging and discharging efficiency of the energy storage battery is improved.

Description

Technical Field

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

[0002] With the development of energy storage technology, energy storage power systems have broad application prospects, such as outdoor emergency power supplies, mobile charging vehicles, and backup power supplies for communication base stations.

[0003] Energy storage charge / discharge efficiency reflects the performance of the energy storage battery; a higher value indicates lower battery loss and better performance, while a lower value indicates higher battery loss and worse performance. Ambient temperature is one factor affecting energy storage charge / discharge efficiency. Currently, energy storage systems follow a preset charge / discharge plan; however, if the energy storage battery's activity is low, direct charging / discharging will reduce its efficiency. Summary of the Invention

[0004] This application provides a charging and discharging control method for an energy storage system, an energy storage system, and a storage medium, aiming to improve the charging and discharging efficiency of energy storage batteries.

[0005] This application provides a charging and discharging control method for an energy storage system, the charging and discharging control method for the energy storage system including:

[0006] Determine the charging and discharging periods of the energy storage system;

[0007] When the working time of the energy storage system is before the charging period and the temperature of the energy storage battery is in the first temperature range, the energy storage battery is controlled to be charged during the charging period.

[0008] When the working time of the energy storage system is before the discharge period, and the temperature of the energy storage battery is in the second temperature range, the energy storage battery is controlled to perform unconventional charging and discharging during the charging and discharging period, and the second temperature range is greater than the first temperature range.

[0009] Optionally, the step of controlling the charging of the energy storage battery during the charging period when the operating time of the energy storage system is before the charging period and the temperature of the energy storage battery is within the first temperature range includes:

[0010] Before the charging period, the operating time of the energy storage system is located before the charging period. The temperature of the energy storage battery is obtained, and it is detected whether the temperature of the energy storage battery is within the first temperature range.

[0011] When the temperature of the energy storage battery is not in the first temperature range, the temperature control system is controlled to work so that the temperature of the energy storage battery drops to the first temperature range when the temperature control system is working.

[0012] When the temperature of the energy storage battery is within the first temperature range and the working time of the energy storage system reaches the start time of the charging period, the energy storage battery is controlled to be charged during the charging period.

[0013] Optionally, when the temperature of the energy storage battery is within the first temperature range, controlling the charging of the energy storage battery during the charging period includes:

[0014] When the temperature of the energy storage battery is within the first temperature range, the temperature control system is turned off, and the energy storage battery is charged during the charging period.

[0015] Optionally, the step of controlling the charging of the energy storage battery after the charging period when the energy storage system's operating time is before the charging period and the energy storage battery temperature is within the first temperature range includes:

[0016] Obtain the charge level of the energy storage battery;

[0017] When the battery level exceeds a first preset level, charging of the energy storage battery is stopped, and the time of stopping charging is determined.

[0018] Detect whether the current time of the energy storage system is between the charging stop time and the start time of the discharging period;

[0019] When the current time of the energy storage system is between the charging stop time and the discharge period start time, the operating time of the energy storage system is determined to be within the charging and discharging period.

[0020] The step of controlling the energy storage battery to perform unconventional charging and discharging during the charging and discharging period when the energy storage system is operating within the charging and discharging period and the energy storage battery temperature is within the second temperature range is executed.

[0021] Optionally, after determining that the operating time of the energy storage system is within the charging / discharging period when the current time of the energy storage system is between the charging stop time and the discharge period start time, the method further includes:

[0022] When the energy storage system is operating during the charging and discharging period and the temperature of the energy storage battery is not within the second temperature range, the temperature of the energy storage battery is raised to the second temperature range, or the energy storage battery is controlled to perform unconventional charging and discharging during the charging and discharging period.

[0023] Optionally, the step of controlling the energy storage battery to perform unconventional charging and discharging during the charging and discharging period when the operating time of the energy storage system is before the discharge period and the temperature of the energy storage battery is within the second temperature range includes:

[0024] When the temperature of the energy storage battery is within the second temperature range and the working time of the energy storage system reaches the start time of the charging and discharging period, the energy storage battery is controlled to perform unconventional charging and discharging during the charging and discharging period.

[0025] Optionally, controlling the energy storage battery to perform unconventional charging and discharging during the charging and discharging period includes:

[0026] The energy storage battery is controlled to discharge at a preset discharge power during the discharge period;

[0027] Detect whether the energy storage battery's charge is less than a second preset charge, where the second preset charge is less than a first preset charge;

[0028] When the power level is less than the second preset power level, the discharge ratio of the discharge current of the energy storage battery is determined based on the current voltage and rated voltage of the energy storage battery.

[0029] The energy storage battery is controlled to discharge based on the discharge ratio.

[0030] Optionally, the step of determining the charging and discharging periods of the energy storage system includes:

[0031] Upon receiving a scheduling instruction from the energy storage system, the historical scheduling information of the energy storage system is obtained;

[0032] The historical scheduling information is analyzed for features to obtain the charging period and the discharging period.

[0033] Optionally, after performing feature analysis on the historical scheduling information to obtain the charging period and the discharging period, the step includes:

[0034] A scheduling data early warning table is generated based on the charging period, the discharging period, the charging power corresponding to the charging period, and the discharging power corresponding to the discharging period.

[0035] Furthermore, to achieve the above objectives, the present invention also provides an energy storage system, the energy storage system comprising:

[0036] Energy storage batteries;

[0037] A charging and discharging device, wherein the charging and discharging device is connected to the energy storage battery;

[0038] Battery temperature acquisition unit, used to acquire the temperature of energy storage batteries;

[0039] A control unit, connected to the charging and discharging device, is used to control the charging and discharging device to charge and discharge the energy storage battery according to the temperature of the energy storage battery.

[0040] Optionally, the control unit includes: a memory, a processor, and a charge / discharge control program for the energy storage system stored in the memory and executable on the processor. When the charge / discharge control program for the energy storage system is executed by the processor, it implements the steps of the charge / discharge control method for the energy storage system described above.

[0041] In addition, to achieve the above objectives, the present invention also provides a computer-readable storage medium storing a charge-discharge control program for an energy storage system, wherein the charge-discharge control program for the energy storage system, when executed by a processor, implements the steps of the charge-discharge control method for the energy storage system described above.

[0042] This application provides a charging and discharging control method, energy storage system, and storage medium for an energy storage system. By pre-determining the charging and discharging periods of the energy storage system, charging is controlled during the charging period when the battery temperature is within a first temperature range. Before the discharging period, if the battery temperature is within a second temperature range, unconventional charging and discharging is controlled during the charging and discharging periods. This solves the problem of low charging and discharging efficiency of the energy storage battery. Because the battery temperature is lowered before charging, the battery itself experiences losses during charging, causing its temperature to rise and its activity to increase. Discharging the battery at this time results in more discharge and higher charging and discharging efficiency. In other words, by using time-sharing judgment to determine the charging and discharging periods, the charging and discharging efficiency of the energy storage battery is improved. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the energy storage system involved in the embodiments of the present invention;

[0044] Figure 2 This is a schematic diagram of the control unit involved in the embodiment of the present invention;

[0045] Figure 3 This is a flowchart illustrating the first embodiment of the charging and discharging control method for the energy storage system of the present invention.

[0046] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. The accompanying drawings are only one embodiment and not the entirety of the invention. Detailed Implementation

[0047] To address the problem of low charge / discharge efficiency in energy storage batteries, this application proposes a charge / discharge control method. By pre-determining the charging and discharging periods of the energy storage system, before the charging period, if the battery temperature is within a first temperature range, the battery is charged during the charging period. Before the discharging period, if the battery temperature is within a second temperature range, the battery is controlled to undergo unconventional charge / discharge during the charging / discharging period. Because the battery temperature is lowered before charging, during the charging process, the battery itself experiences losses, causing its temperature to rise and its activity to increase. Discharging the battery at this time results in greater discharge and higher charge / discharge efficiency. In other words, by using time-sharing judgment to determine the charging period, the charge / discharge efficiency of the energy storage battery is improved.

[0048] To better understand the above technical solutions, exemplary embodiments of this disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of this disclosure to those skilled in the art.

[0049] The energy storage efficiency of an energy storage battery directly impacts its cost. To improve energy storage efficiency, it's crucial to understand the factors influencing it. These factors include, but are not limited to, charging / discharging current, ambient temperature, and the battery's own structure.

[0050] The impact of charging and discharging current: As the characteristics of energy storage batteries show, when discharging, a high-current discharge releases less energy than a low-current discharge. It can be seen that the coulombic efficiency of the energy storage battery decreases as the current increases. This is because a high current shortens the charging and discharging time, but the energy loss due to self-discharge is greater. Both charging and discharging efficiencies increase with increasing current when the current is low. However, after a certain point, both decrease with further increases in current. This is because excessive current intensifies internal polarization, increasing power loss and thus energy dissipation, leading to decreased efficiency. Therefore, the charging and discharging current should not be chosen blindly; both excessively high and low currents will reduce efficiency. The charging and discharging current must be selected based on the specific circumstances.

[0051] The influence of ambient temperature: Setting the charging method of the energy storage battery to constant voltage and current limiting will affect the current diffusion within the battery when the ambient temperature is below 10℃, reducing its efficiency. However, it has little impact on the density of the exchange current, thus exacerbating the polarization of the concentration gradient within the battery and leading to a decrease in energy storage efficiency. Low temperatures also hinder the chemical reactions during charging and discharging, ultimately resulting in a decrease in energy storage efficiency.

[0052] Many factors affect the charging and discharging efficiency of energy storage batteries. For example... Figure 3 As shown, in the first embodiment of this application, a novel method for improving the charging and discharging efficiency of an energy storage battery is proposed. Specifically, the charging and discharging control method for the energy storage system of this application includes the following steps:

[0053] Step S110: Determine the charging and discharging periods of the energy storage system.

[0054] In this embodiment, the upstream equipment or power grid will retrieve and analyze relevant information from the energy storage system in real time or periodically to plan or revise the charging and discharging of the energy storage system. The energy storage system can be used for peak shaving and valley filling to improve grid congestion. For example, during grid congestion, historical information about the energy storage system can be obtained and analyzed to formulate or revise the subsequent charging and discharging plan, reducing energy loss when the energy storage system operates according to the revised plan. This relevant information includes, but is not limited to, charging power during charging periods, discharging power during discharging periods, and the temperature of the energy storage battery during charging and discharging.

[0055] Optionally, upon receiving a dispatch instruction from the energy storage system, historical dispatch information and battery temperature of the energy storage system can be obtained. The historical dispatch information refers to the dispatch information from the upstream equipment / grid to the energy storage system. This historical dispatch information may also include the charging power corresponding to historical charging periods and the discharging power corresponding to historical discharging periods of the energy storage system. Feature analysis can be performed on this historical dispatch information to obtain the charging and discharging periods of the energy storage system. Optionally, feature analysis of the historical dispatch information may involve performing characteristic analysis such as mean, root mean square value, variance, and kurtosis on the charging power corresponding to historical charging periods and the discharging power corresponding to historical discharging periods to determine the charging and discharging periods.

[0056] Optionally, upon receiving a scheduling command from the energy storage system, the system can also acquire the temperature of the energy storage battery, observe its temperature changes, and analyze the impact of these temperature changes on the charging and discharging power of the energy storage system. This allows for advance prediction of potential scheduling needs during subsequent energy storage system operation. For example, if historical data indicates an abnormality in the charging of the energy storage battery between 8:00 and 9:00 AM, the system can access and process battery temperature data or other relevant data from before 8:00 AM during subsequent charging and discharging control. This allows for proactive avoidance of obstacles that might affect the battery's charging and discharging efficiency, ensuring normal charging during the 8:00-9:00 AM period and improving energy storage efficiency.

[0057] Optionally, upon obtaining the charging and discharging periods of the energy storage system, a scheduling data early warning table can be generated based on the charging and discharging periods, the charging power corresponding to the charging period, and the discharging power corresponding to the discharging period. This scheduling data early warning table also includes the times when scheduling is required, determined based on the temperature of the energy storage battery. By establishing the scheduling data early warning table for the energy storage system in advance, the scheduling that the energy storage system may need to perform can be predicted. This allows the control unit to control the heating and cooling equipment and the charging and discharging devices of the energy storage system to operate according to preset conditions based on the scheduling data early warning table and the energy storage battery's status, thereby improving the charging and discharging efficiency of the energy storage battery.

[0058] Step S120: When the working time of the energy storage system is before the charging period and the temperature of the energy storage battery is in the first temperature range, the energy storage battery is controlled to be charged during the charging period.

[0059] In this embodiment, to anticipate potential scheduling needs of the energy storage system and mitigate factors that could affect the discharge efficiency of the energy storage battery, the battery temperature is monitored based on a scheduling data warning table before each charging and discharging period. The system determines whether the battery temperature meets actual requirements; if it does, charging or discharging proceeds. The condition for the battery temperature to meet actual requirements is that it cools down before charging and discharges when the temperature rises.

[0060] During the pre-charging cooling process, the energy storage system operates according to pre-set charging and discharging periods, meaning the timing of charging and discharging is known. To mitigate potential factors affecting battery charging efficiency and improve overall efficiency, the system needs to reach the required temperature before charging begins. Therefore, before charging—that is, before the charging period begins—the battery temperature is measured. When the battery temperature falls within a first temperature range, the battery is considered ready for charging. This first temperature range can be preset based on specific conditions. Once the battery meets the charging conditions, and the current time coincides with the start of the charging period, the charging / discharging device can be controlled to charge the battery during that period.

[0061] For example, the charging period for the energy storage battery is from 8:00 to 9:00 AM. At 7:50 AM, when the battery temperature is between 10 and 20 degrees Celsius, it is determined that the battery has met the charging conditions. Charging begins when the battery's current time reaches 8:00 AM.

[0062] Optionally, when the energy storage system is operating before the charging period, the temperature of the energy storage battery is acquired, and it is detected whether the temperature of the energy storage battery is within a first temperature range. If the temperature of the energy storage battery is not within the first temperature range, the temperature control system is controlled to operate, so as to reduce the temperature of the energy storage battery to the first temperature range through the cold air generated by the temperature control system during operation; or, if the temperature of the energy storage battery is not within the first temperature range, the temperature of the energy storage battery is reduced to the first temperature range by other means. When the temperature of the energy storage battery is reduced to the first temperature range, and the current operating time of the energy storage system reaches the start time of the charging period, the charging and discharging device is controlled to charge the energy storage battery during the charging period.

[0063] Optionally, when the energy storage battery temperature is within the first temperature range, the temperature control system can be shut down, and the charging and discharging device can be controlled to charge the energy storage battery during the charging period. Alternatively, when the energy storage system's operating time coincides with the start of the charging period, and the energy storage battery temperature is within the first temperature range, the temperature control system can be shut down, and the charging and discharging device can be controlled to charge the energy storage battery during the charging period. Because the battery temperature is lowered based on the ambient temperature during charging, or the energy storage battery temperature is lowered in advance for charging, and power-consuming equipment such as the temperature control system is shut down, the charging efficiency of the energy storage battery is improved during subsequent charging.

[0064] The aforementioned temperature control system includes systems with temperature rise and fall capabilities, such as liquid chillers or air conditioners.

[0065] Optionally, the energy storage system charges according to a preset charging power curve during the charging process. This preset charging power curve can be predetermined or dynamically adjusted according to the actual situation during the actual charging process.

[0066] Step S130: When the working time of the energy storage system is before the discharge period and the temperature of the energy storage battery is in the second temperature range, the energy storage battery is controlled to perform unconventional charging and discharging during the charging and discharging period, and the second temperature range is greater than the first temperature range.

[0067] In this embodiment, before discharge, i.e., when the energy storage system is in the charging / discharging period, the temperature of the energy storage battery is acquired. When the energy storage battery temperature is within a second temperature range, i.e., the energy storage battery reaches unconventional charging / discharging conditions, the energy storage battery is controlled to perform unconventional charging / discharging during the charging / discharging period. The second temperature range can be preset according to actual conditions, and this second temperature range is larger than the first temperature range. This is because during the charging process, the energy storage battery itself experiences losses, causing its temperature to rise and potentially reach the second temperature range. When the energy storage battery reaches the unconventional charging / discharging conditions, and when the current time of the energy storage battery reaches the start time of the charging / discharging period, the energy storage battery can be controlled to perform unconventional charging / discharging during that period. The unconventional charging / discharging of the energy storage battery can provide a certain amount of power to the water-cooled unit or refrigeration equipment.

[0068] Optionally, determining whether an energy storage battery has reached unconventional charge / discharge conditions can also involve: acquiring the energy storage battery's charge level; when the battery's charge level reaches the required condition, the battery is deemed to have reached the unconventional charge / discharge conditions. Alternatively, it can be determined that the energy storage battery has reached the unconventional charge / discharge conditions when the energy storage system's operating time reaches the start of the charge / discharge period and the battery's temperature is within the second temperature range. Once the energy storage battery reaches the unconventional charge / discharge conditions, unconventional charge / discharge can be performed.

[0069] Optionally, determining whether the energy storage system's operating time falls before the discharge period can be achieved by: acquiring the energy storage battery's charge level, i.e., acquiring the energy storage battery's state of charge; stopping charging the energy storage battery when its charge level exceeds a first preset charge level. The first preset charge level can be set according to actual conditions; for example, when the first preset charge level is 100%, it indicates a full charge, and charging is stopped. When charging the energy storage battery is stopped, the stopping time is determined, and it is detected whether the current time of the energy storage system falls between the stopping time and the start time of the discharge period. If the current time of the energy storage system falls between the stopping time and the start time of the discharge period, it is determined that the energy storage system's operating time falls before the discharge period. When the energy storage system's operating time falls before the discharge period, the energy storage battery temperature is acquired. When the energy storage battery temperature is within a second temperature range and the current operating time of the energy storage system reaches the start time of the charge / discharge period, the energy storage battery is controlled to perform unconventional charging and discharging during the charge / discharge period.

[0070] Optionally, when the energy storage system is operating before the discharge period and the energy storage battery temperature is not in the second temperature range, the energy storage battery temperature can be raised to the second temperature range; when the energy storage battery temperature rises to the second temperature range, the energy storage battery is controlled to perform unconventional charging and discharging during the charging and discharging period.

[0071] Optionally, when the energy storage battery temperature reaches the second temperature range and the current operating time of the energy storage system reaches the start time of charging and discharging, the energy storage battery is controlled to perform unconventional charging and discharging during the charging and discharging period.

[0072] Raising the temperature of the energy storage battery to the second temperature range increases its activity. Discharging when the battery is more active shortens the discharge time and improves discharge efficiency.

[0073] Optionally, when the energy storage system's operating time is before the discharge period and the energy storage battery temperature is within the second temperature range; or when the energy capacity is greater than a first preset energy capacity, the energy storage system's operating time is before the discharge period and the energy storage battery temperature is within the second temperature range; or when the energy capacity is greater than a first preset energy capacity, the energy storage battery temperature is within the second temperature range and the energy storage system's operating time reaches the start time of the charge / discharge period, the energy storage battery can be controlled to perform unconventional charge / discharge during the charge / discharge period. Specifically, controlling the energy storage battery to perform unconventional charge / discharge during the charge / discharge period may include the following steps:

[0074] Step S131: Control the energy storage battery to discharge at a preset discharge power during the discharge period;

[0075] Step S132: Detect whether the energy storage battery's charge is less than the second preset charge, where the second preset charge is less than the first preset charge;

[0076] Step S133: When the power is less than the second preset power, determine the discharge ratio of the discharge current of the energy storage battery based on the current voltage and rated voltage of the energy storage battery.

[0077] Step S134: Control the energy storage battery to discharge based on the discharge ratio.

[0078] In this embodiment, unconventional charging and discharging refers to unbalanced charging and discharging, such as charging at the rated power and discharging at a lower rate, or discharging at the rated power and charging at a lower rate.

[0079] In this embodiment, during the discharge process, the energy storage battery initially discharges at a preset discharge power. During discharge, the battery's charge level is acquired in real time, and it is determined whether the charge level is less than a second preset charge level, i.e., whether the battery is about to be completely discharged. The second preset charge level is less than a first preset charge level. When the battery's charge level is less than the second preset charge level, it indicates that the battery is about to be completely discharged. When the battery is about to be completely discharged, the discharge current ratio is determined based on the battery's current voltage and rated voltage. The battery is then controlled to discharge according to this ratio, ensuring that the battery's discharge current is completely discharged. Because the battery can gradually reduce its discharge current based on the ratio of its current voltage to its rated voltage, the battery's charge level is completely discharged, thereby improving the battery's charging and discharging efficiency.

[0080] Optionally, when the energy storage battery's charge is greater than a second preset charge, it can continue to discharge according to a preset discharge power corresponding to that discharge period. Discharge will only proceed according to a predetermined discharge ratio when the energy storage battery's charge falls below the second preset charge, thereby improving discharge efficiency.

[0081] Because the energy storage battery is controlled to discharge at a preset discharge power during the initial discharge period, and the battery's charge level is monitored in real time during discharge to ensure it is below a second preset charge level, when the charge level is below the second preset charge level (i.e., when the battery is about to be depleted), the discharge ratio of the battery's discharge current is determined based on the battery's current voltage and rated voltage. This allows the battery to discharge based on the specified discharge ratio. Since the energy storage battery can gradually reduce its discharge current according to the ratio of its current voltage and rated voltage, it can completely deplete the battery's charge, thereby improving the battery's charging and discharging efficiency.

[0082] This embodiment, based on the above technical solution, determines the charging and discharging periods of the energy storage system in advance. Before the charging period, when the energy storage battery temperature is within the first temperature range, charging is controlled during the charging period. Before the discharging period, if the energy storage battery temperature is within the second temperature range, unconventional charging and discharging is controlled during the charging and discharging periods. This solves the problem of low charging and discharging efficiency of the energy storage battery. Because the energy storage battery temperature is lowered before charging, during the charging process, the energy storage battery itself experiences losses, causing its temperature to rise and its activity to increase. Discharging the energy storage battery at this time results in greater discharge and higher charging and discharging efficiency. In other words, by charging the energy storage battery while it is cooling down and controlling its discharge while it is heating up, the charging and discharging efficiency of the energy storage battery is improved.

[0083] This invention provides an embodiment of a charging and discharging control method for an energy storage system. It should be noted that although the logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than that shown here.

[0084] Based on the same inventive concept, this application also proposes an energy storage system. For example... Figure 1 As shown, Figure 1 This is a schematic diagram of the hardware operating environment of the energy storage system of this application. The energy storage system may include: an energy storage battery, a charging and discharging device, a battery temperature acquisition unit, and a control unit. The functions of each component of the energy storage system are as follows:

[0085] Energy storage batteries mainly refer to energy storage batteries used for storing energy from solar power generation equipment, wind power generation equipment, and renewable energy sources. These energy storage batteries can provide the electricity required for the operation of cooling and heating equipment, and the number of these energy storage batteries can be one or more. Among them, the cooling and heating equipment of this application can be an air conditioner that can generate heat or cool, or a liquid cooling unit, etc., used to control the battery temperature. Its operation requires a certain amount of power, which can be provided by the energy storage battery.

[0086] The battery temperature acquisition unit in this application is used to acquire the temperature of the energy storage battery.

[0087] The charging and discharging device of this application is a device for charging and discharging energy storage batteries according to the energy storage system control, such as DC / DC, PCS, etc.; the charging and discharging device is connected to the energy storage battery and the control unit, and the control unit controls the charging and discharging device to charge and discharge the energy storage battery according to the energy storage battery temperature collected by the battery temperature acquisition unit.

[0088] The control unit of this application is a control system, used to detect the temperature of the energy storage battery or energy storage system, control the operation of the cooling and heating equipment, and control the operation of the charging and discharging device.

[0089] Those skilled in the art will understand that Figure 2 The structure of the energy storage system shown does not constitute a limitation on the energy storage system. It may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0090] like Figure 2 The control unit includes a processor 1001, such as a CPU, a memory 1005, a user interface 1003, a network interface 1004, and a communication bus 1002. The communication bus 1002 is used to enable communication between these components. The user interface 1003 may include a display screen or an input unit such as a keyboard; optionally, the user interface 1003 may also include a standard wired interface or a wireless interface. The network interface 1004 may optionally include a standard wired interface or a wireless interface (such as a Wi-Fi interface). The memory 1005 may be high-speed RAM or non-volatile memory, such as a disk drive. Optionally, the memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0091] Those skilled in the art will understand that Figure 2 The structure of the control unit shown does not constitute a limitation on the control unit and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0092] like Figure 2 As shown, the memory 1005, which serves as a storage medium, may include an operating system, a network communication module, a user interface module, and a charging / discharging control program for the energy storage system. The operating system is a program that manages and controls the hardware and software resources of the control unit, the charging / discharging control program for the energy storage system, and the operation of other software or programs.

[0093] exist Figure 2 In the control unit shown, the user interface 1003 is mainly used to connect to the terminal and communicate with the terminal; the network interface 1004 is mainly used to communicate with the backend server; and the processor 1001 can be used to call the charging and discharging control program of the energy storage system stored in the memory 1005.

[0094] In this embodiment, the control unit includes: a memory 1005, a processor 1001, and a charging and discharging control program for the energy storage system stored in the memory and executable on the processor, wherein:

[0095] When processor 1001 calls the charging and discharging control program of the energy storage system stored in memory 1005, it performs the following operations:

[0096] Determine the charging and discharging periods of the energy storage system;

[0097] When the working time of the energy storage system is before the charging period and the temperature of the energy storage battery is in the first temperature range, the energy storage battery is controlled to be charged during the charging period.

[0098] When the working time of the energy storage system is before the discharge period, and the temperature of the energy storage battery is in the second temperature range, the energy storage battery is controlled to perform unconventional charging and discharging during the charging and discharging period, and the second temperature range is greater than the first temperature range.

[0099] When processor 1001 calls the charging and discharging control program of the energy storage system stored in memory 1005, it also performs the following operations:

[0100] Before the charging period, the operating time of the energy storage system is located before the charging period. The temperature of the energy storage battery is obtained, and it is detected whether the temperature of the energy storage battery is within the first temperature range.

[0101] When the temperature of the energy storage battery is not in the first temperature range, the temperature control system is controlled to work so that the temperature of the energy storage battery drops to the first temperature range when the temperature control system is working.

[0102] When the temperature of the energy storage battery is within the first temperature range and the working time of the energy storage system reaches the start time of the charging period, the energy storage battery is controlled to be charged during the charging period.

[0103] When processor 1001 calls the charging and discharging control program of the energy storage system stored in memory 1005, it also performs the following operations:

[0104] When the temperature of the energy storage battery is within the first temperature range, the temperature control system is turned off, and the energy storage battery is charged during the charging period.

[0105] When processor 1001 calls the charging and discharging control program of the energy storage system stored in memory 1005, it also performs the following operations:

[0106] Obtain the charge level of the energy storage battery;

[0107] When the battery level exceeds a first preset level, charging of the energy storage battery is stopped, and the time of stopping charging is determined.

[0108] Detect whether the current time of the energy storage system is between the charging stop time and the start time of the discharging period;

[0109] When the current time of the energy storage system is between the charging stop time and the discharge period start time, the operating time of the energy storage system is determined to be within the charging and discharging period.

[0110] The step of controlling the energy storage battery to perform unconventional charging and discharging during the charging and discharging period when the energy storage system is operating within the charging and discharging period and the energy storage battery temperature is within the second temperature range is executed.

[0111] When processor 1001 calls the charging and discharging control program of the energy storage system stored in memory 1005, it also performs the following operations:

[0112] When the energy storage system is operating during the charging and discharging period and the temperature of the energy storage battery is not in the second temperature range, the temperature of the energy storage battery is raised to the second temperature range, or the energy storage battery is controlled to perform unconventional charging and discharging during the charging and discharging period.

[0113] When processor 1001 calls the charging and discharging control program of the energy storage system stored in memory 1005, it also performs the following operations:

[0114] When the temperature of the energy storage battery is within the second temperature range and the working time of the energy storage system reaches the start time of the charging and discharging period, the energy storage battery is controlled to perform unconventional charging and discharging during the charging and discharging period.

[0115] When processor 1001 calls the charging and discharging control program of the energy storage system stored in memory 1005, it also performs the following operations:

[0116] The energy storage battery is controlled to discharge at a preset discharge power during the discharge period;

[0117] Detect whether the energy storage battery's charge is less than a second preset charge, where the second preset charge is less than a first preset charge;

[0118] When the power level is less than the second preset power level, the discharge ratio of the discharge current of the energy storage battery is determined based on the current voltage and rated voltage of the energy storage battery.

[0119] The energy storage battery is controlled to discharge based on the discharge ratio.

[0120] When processor 1001 calls the charging and discharging control program of the energy storage system stored in memory 1005, it also performs the following operations:

[0121] Upon receiving a scheduling instruction from the energy storage system, the historical scheduling information of the energy storage system is obtained;

[0122] The historical scheduling information is analyzed for features to obtain the charging period and the discharging period.

[0123] When processor 1001 calls the charging and discharging control program of the energy storage system stored in memory 1005, it also performs the following operations:

[0124] A scheduling data early warning table is generated based on the charging period, the discharging period, the charging power corresponding to the charging period, and the discharging power corresponding to the discharging period.

[0125] Based on the same inventive concept, this application also provides a computer-readable storage medium storing a charging and discharging control program for an energy storage system. When the charging and discharging control program for the energy storage system is executed by a processor, it implements the various steps of the charging and discharging control method for the energy storage system as described above, and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0126] Since the storage medium provided in this application embodiment is the storage medium used to implement the method of this application embodiment, those skilled in the art can understand the specific structure and variations of the storage medium based on the method described in this application embodiment, and therefore will not be repeated here. All storage media used in the method of this application embodiment are within the scope of protection of this application.

[0127] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0128] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0129] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1The function specified in one or more boxes.

[0130] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0131] It should be noted that any reference signs placed between parentheses in the claims should not be construed as limiting the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "a" or "an" preceding a component does not exclude the presence of a plurality of such components. The invention can be implemented by means of hardware comprising several different components and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names.

[0132] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0133] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A charging and discharging control method for an energy storage system, characterized in that, The charging and discharging control method of the energy storage system includes: Determine the charging and discharging periods of the energy storage system; When the working time of the energy storage system is before the charging period and the temperature of the energy storage battery is in the first temperature range, the energy storage battery is controlled to be charged during the charging period. Obtain the charge level of the energy storage battery; When the battery level exceeds a first preset level, charging of the energy storage battery is stopped, and the time when charging is stopped is determined. Detect whether the current time of the energy storage system is between the time when charging stops and the start time of the discharge period; When the current time of the energy storage system is between the charging stop time and the discharge period start time, the operating time of the energy storage system is determined to be within the charging and discharging period. When the energy storage system is operating during the charging and discharging period and the energy storage battery temperature is in the second temperature range, the energy storage battery is controlled to perform unconventional charging and discharging during the charging and discharging period. The second temperature range is greater than the first temperature range.

2. The charging and discharging control method for an energy storage system as described in claim 1, characterized in that, The step of controlling the charging of the energy storage battery during the charging period when the energy storage system is operating before the charging period and the energy storage battery temperature is within the first temperature range includes: Before the charging period, the operating time of the energy storage system is located before the charging period. The temperature of the energy storage battery is obtained, and it is detected whether the temperature of the energy storage battery is within the first temperature range. When the temperature of the energy storage battery is not in the first temperature range, the temperature control system is controlled to work so that the temperature of the energy storage battery drops to the first temperature range when the temperature control system is working. When the temperature of the energy storage battery is within the first temperature range and the working time of the energy storage system reaches the start time of the charging period, the energy storage battery is controlled to be charged during the charging period.

3. The charging and discharging control method for an energy storage system as described in claim 1, characterized in that, When the temperature of the energy storage battery is within the first temperature range, controlling the charging of the energy storage battery during the charging period includes: When the temperature of the energy storage battery is within the first temperature range, the temperature control system is turned off, and the energy storage battery is charged during the charging period.

4. The charging and discharging control method for an energy storage system as described in claim 1, characterized in that, After determining that the operating time of the energy storage system is within the charging / discharging period when the current time of the energy storage system is between the charging stop time and the discharge period start time, the method further includes: When the energy storage system is operating during the charging and discharging period and the temperature of the energy storage battery is not in the second temperature range, the temperature of the energy storage battery is raised to the second temperature range, or the energy storage battery is controlled to perform unconventional charging and discharging during the charging and discharging period.

5. The charging and discharging control method for an energy storage system as described in claim 4, characterized in that, When the energy storage system is operating during the charging / discharging period and the energy storage battery temperature is within the second temperature range, the step of controlling the energy storage battery to perform unconventional charging / discharging during the charging / discharging period includes: When the temperature of the energy storage battery is within the second temperature range and the working time of the energy storage system reaches the start time of the charging and discharging period, the energy storage battery is controlled to perform unconventional charging and discharging during the charging and discharging period.

6. The charging and discharging control method for an energy storage system as described in claim 1 or 5, characterized in that, The control of the energy storage battery to perform unconventional charging and discharging during the charging and discharging period includes: The energy storage battery is controlled to discharge at a preset discharge power during the discharge period; Detect whether the energy storage battery's charge is less than a second preset charge, where the second preset charge is less than a first preset charge; When the power level is less than the second preset power level, the discharge ratio of the discharge current of the energy storage battery is determined based on the current voltage and rated voltage of the energy storage battery. The energy storage battery is controlled to discharge based on the discharge ratio.

7. The charging and discharging control method for an energy storage system as described in claim 1, characterized in that, The steps for determining the charging and discharging periods of the energy storage system include: Upon receiving a scheduling instruction from the energy storage system, the historical scheduling information of the energy storage system is obtained; The historical scheduling information is analyzed for features to obtain the charging period and the discharging period.

8. The charging and discharging control method for an energy storage system as described in claim 7, characterized in that, After performing feature analysis on the historical scheduling information to obtain the charging period and the discharging period, the steps include: A scheduling data early warning table is generated based on the charging period, the discharging period, the charging power corresponding to the charging period, and the discharging power corresponding to the discharging period.

9. An energy storage system, characterized in that, The energy storage system includes: Energy storage batteries; A charging and discharging device, wherein the charging and discharging device is connected to the energy storage battery; Battery temperature acquisition unit, used to acquire the temperature of energy storage batteries; A control unit, connected to the charging and discharging device, is used to control the charging and discharging device to charge and discharge the energy storage battery according to the temperature of the energy storage battery; The control unit further includes: a memory, a processor, and a charge / discharge control program for the energy storage system stored in the memory and executable on the processor. When the charge / discharge control program for the energy storage system is executed by the processor, it implements the steps of the charge / discharge control method for the energy storage system as described in any one of claims 1-8.

10. A computer-readable storage medium, characterized in that, It stores a charging and discharging control program for an energy storage system, which, when executed by a processor, implements the steps of the charging and discharging control method for the energy storage system as described in any one of claims 1-8.

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