Energy storage system and control method of energy storage system

Abstract

This invention discloses an energy storage system and a control method for the energy storage system, relating to the field of energy storage technology. The energy storage system includes an energy storage module; a first switching assembly, with a first end electrically connected to the energy storage module and a second end for connecting to multiple DC buses; an AC / DC conversion module, with a first end for connecting to the power grid and a second end electrically connected to the energy storage module, the AC / DC conversion module being used to rectify the AC power from the power grid and output it to the energy storage module, and / or, the AC / DC conversion module being used to invert the received DC power and output it to the power grid; a voltage sampling module for acquiring the voltage of the energy storage module; and a main control module for controlling the operation of the AC / DC conversion module and also for controlling the on / off state of the first switching assembly. This invention aims to achieve effective recovery and reuse of regenerative energy from the equipment, minimizing electricity costs.

Description

Technical Field

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

[0002] Currently, all kinds of production and manufacturing equipment are being upgraded and transformed towards new energy, energy saving and power saving. This solution mainly involves equipment that can generate renewable energy, including elevators, lifting machinery and oil pumps. At present, the energy source of these devices is the mains power. According to statistics, the annual power consumption of elevators alone reaches 26 billion kWh nationwide. When the mains power fails, the equipment cannot operate reliably and stably, affecting the daily operation of the equipment. At the same time, when the equipment operates and drives the main circuit, it generates renewable energy. The current common way to deal with this is to dissipate it ineffectively in the form of heat energy by consuming resistors. There is a lack of effective recovery solutions, so there is a lot of energy waste. Summary of the Invention

[0003] The main objective of this invention is to propose an energy storage system and a control method for the energy storage system, aiming to achieve effective recovery and reuse of the energy generated by the equipment and minimize electricity costs.

[0004] To achieve the above objectives, the present invention proposes an energy storage system comprising:

[0005] Energy storage module;

[0006] A first switching assembly, wherein a first end of the first switching assembly is electrically connected to the energy storage module, and a second end of the first switching assembly is used to connect to multiple DC buses;

[0007] An AC / DC conversion module is provided, wherein a first terminal of the AC / DC conversion module is used to connect to the power grid, and a second terminal of the AC / DC conversion module is electrically connected to the energy storage module. The AC / DC conversion module is used to rectify the AC power from the power grid and output it to the energy storage module, and / or, the AC / DC conversion module is used to invert the received DC power and output it to the power grid.

[0008] A voltage sampling module, used to acquire the voltage of the energy storage module;

[0009] The main control module is used to control the AC-DC conversion module to invert the DC power output by the energy storage module and output it to the grid when the voltage of the energy storage module is greater than a preset overcharge threshold, until the voltage of the energy storage module is no greater than the preset overcharge threshold.

[0010] And / or, control the first switching component to turn on, so that the energy storage module discharges to the DC bus until the voltage of the energy storage module is not greater than a preset overcharge threshold;

[0011] The main control module is also used to control the AC / DC conversion module to charge the energy storage module when the voltage of the energy storage module is less than the preset over-discharge threshold, until the voltage of the energy storage module is not less than the preset over-discharge threshold.

[0012] And / or, control the first switching component to turn on so that the DC bus charges the energy storage module until the voltage of the energy storage module is not less than a preset over-discharge threshold;

[0013] Wherein, the preset overcharge threshold is greater than the preset over-discharge threshold.

[0014] In one embodiment, the energy storage system further includes:

[0015] A DC-DC converter module is provided, wherein a first terminal of the DC-DC converter module is connected to the energy storage module and a second terminal of the AC-DC converter module, the second terminal of the DC-DC converter module is connected to the first terminal of the first switching assembly, and the controlled terminal of the DC-DC converter module is electrically connected to the main control module. The DC-DC converter module is used to convert the voltage of the energy storage module and output a voltage identical to that of the DC bus to the DC bus; it is also used to convert the voltage of the DC bus and output a voltage identical to that of the energy storage module to the energy storage module.

[0016] In one embodiment, the energy storage system further includes:

[0017] A unidirectional conduction circuit is provided, wherein the first terminals of the energy storage module and the first switching assembly are both electrically connected to the cathode of the unidirectional conduction circuit, and the anode of the unidirectional conduction circuit is used to connect to the DC bus.

[0018] In one embodiment, the energy storage system further includes a plurality of second switching components, the first ends of the plurality of second switching components being electrically connected to the second ends of the first switching components, the second ends of the plurality of second switching components being electrically connected to a plurality of DC buses in a one-to-one correspondence, and the controlled ends of the second switching components being electrically connected to the main control module.

[0019] The present invention also proposes a control method for an energy storage system, applicable to any of the energy storage systems described above, the control method comprising:

[0020] Obtain the voltage of the energy storage module;

[0021] If the voltage of the energy storage module is greater than the preset overcharge threshold, the AC-DC conversion module is controlled to invert the DC power output by the energy storage module and output it to the grid until the voltage of the energy storage module is no greater than the preset overcharge threshold.

[0022] And / or, control the first switching component to turn on, so that the energy storage module discharges to the DC bus until the voltage of the energy storage module is not greater than a preset overcharge threshold;

[0023] If the voltage of the energy storage module is less than a preset over-discharge threshold, the AC / DC converter is controlled to charge the energy storage module until the voltage of the energy storage module is not less than the preset over-discharge threshold.

[0024] And / or, control the first switching component to turn on so that the DC bus charges the energy storage module until the voltage of the energy storage module is not less than a preset over-discharge threshold.

[0025] In one embodiment, the step of controlling the AC / DC converter to invert the DC power output from the energy storage module and output it to the power grid when the voltage of the energy storage module is greater than a preset overcharge threshold, until the voltage of the energy storage module is not greater than the preset overcharge threshold; and / or, controlling the first switching component to conduct so that the energy storage module discharges to the DC bus until the voltage of the energy storage module is not greater than the preset overcharge threshold includes:

[0026] Obtain the power conversion function of the AC / DC converter module;

[0027] When the AC / DC conversion module is capable of performing the inverter function, the first switching component is controlled to turn off, and the AC / DC conversion module is controlled to invert the DC power output by the energy storage module according to the rated power and output it to the grid until the voltage of the energy storage module is not greater than the preset overcharge threshold.

[0028] When the AC / DC conversion module is unable to perform the inverter function, the control equipment scheduling center prioritizes the operation of equipment with motor power greater than the preset power to consume electricity, so that the total power consumption of multiple devices is greater than the total regenerated power of multiple devices, and controls the first switching component to conduct, so that the energy storage module discharges to the DC bus until the voltage of the energy storage module is not greater than the preset overcharge threshold.

[0029] In one embodiment, the step of controlling the AC / DC converter to charge the energy storage module when the voltage of the energy storage module is less than a preset over-discharge threshold, until the voltage of the energy storage module is not less than the preset over-discharge threshold; and / or controlling the first switching component to conduct so that the DC bus charges the energy storage module until the voltage of the energy storage module is not less than the preset over-discharge threshold includes:

[0030] Obtain the total regeneration power and total power consumption of multiple devices, and compare the total regeneration power and the total power consumption;

[0031] When the total regenerated power is greater than the total power consumption, the first switching component is controlled to be turned on so that the DC bus charges the energy storage module;

[0032] When the total regenerated power is not greater than the total power consumption, the power conversion function of the AC-DC converter is obtained, and when the AC-DC converter can perform the rectification function, the first switch component is controlled to turn off, and the AC-DC converter is controlled to rectify the AC power of the grid and output DC power to the energy storage module to charge the energy storage module.

[0033] In one embodiment, the step of acquiring the power conversion function of the AC / DC converter module when the total regenerated power is not greater than the total power consumption, and controlling the first switching component to turn off when the AC / DC converter module is capable of performing rectification, and controlling the AC / DC converter module to rectify the AC power from the grid and output DC power to the energy storage module to charge the energy storage module includes:

[0034] In the case where the energy storage system includes a unidirectional conduction circuit, the first switching component is controlled to turn off so that the DC bus charges the energy storage module;

[0035] In the absence of a unidirectional conduction circuit in the energy storage system, the first switching component is controlled to turn off, and the power conversion function of the AC / DC conversion module is obtained.

[0036] When the AC / DC conversion module is capable of performing rectification, the AC / DC conversion module is controlled to rectify the AC power of the power grid according to the first preset power and output DC power to the energy storage module to charge the energy storage module until the voltage of the energy storage module is not less than the preset over-discharge threshold.

[0037] If the AC / DC conversion module is unable to perform rectification, the energy storage system is controlled to enter a sleep mode.

[0038] The first terminals of the energy storage module and the first switch assembly are both electrically connected to the output terminal of the unidirectional conduction circuit, and the input terminal of the unidirectional conduction circuit is used to connect to the DC bus.

[0039] In one embodiment, after obtaining the voltage of the energy storage module, the method further includes:

[0040] When the voltage of the energy storage module is not greater than a preset overcharge threshold and not less than a preset over-discharge threshold, the actual electricity price for the current time period is obtained, and the actual electricity price is compared with the preset electricity price.

[0041] When the actual electricity price is greater than the preset electricity price, the power conversion function of the AC / DC conversion module is obtained, and when the AC / DC conversion module has an inverter function, the AC / DC conversion module is controlled to invert the DC power output by the energy storage module and output it to the power grid.

[0042] When the actual electricity price is not greater than the preset electricity price, the power conversion function of the AC / DC conversion module is obtained, and when the AC / DC conversion module has a rectification function, the AC / DC conversion module is controlled to charge the energy storage module.

[0043] In one embodiment, the step of acquiring the power conversion function of the AC / DC converter module when the actual electricity price is greater than the preset electricity price, and controlling the AC / DC converter module to invert the DC power output from the energy storage module and output it to the power grid when the AC / DC converter module has an inverter function, includes:

[0044] Obtain the total regeneration power and total power consumption of multiple devices, and compare the total regeneration power and the total power consumption;

[0045] When the total regenerated power is greater than the total power consumption, the power conversion function of the AC / DC converter is activated. If the AC / DC converter has an inverter function, the first switching component is turned on, and the AC / DC converter is controlled to continuously invert the DC power output from the energy storage module and the DC power on the DC bus and output them to the grid according to a second preset power for a first preset duration. The first preset duration includes the duration during which the total regenerated power is greater than the total power consumption.

[0046] If the total regenerated power is not greater than the total power consumption, the discharge capacity of the energy storage module is obtained, and the discharge capacity is compared with the difference between the total regenerated power and the total power consumption.

[0047] When the dischargeable amount is greater than the difference between the total regenerated power and the total power consumption, the first switching component is controlled to turn on so that the energy storage module discharges to the DC bus. The power conversion function of the AC / DC converter module is also acquired. When the AC / DC converter module is able to perform the inverter function, the AC / DC converter module is controlled to continuously invert the DC power output by the energy storage module and output it to the grid according to a third preset power for a second preset duration. The second preset duration includes the duration during which the total regenerated power is not greater than the total power consumption.

[0048] In one embodiment, the step of acquiring the power conversion function of the AC / DC converter module when the actual electricity price is not greater than the preset electricity price, and controlling the AC / DC converter module to charge the energy storage module when the AC / DC converter module has a rectification function, includes:

[0049] Obtain the total regeneration power and total power consumption of multiple devices, and compare the total regeneration power and the total power consumption;

[0050] If the total regenerated power is greater than the total power consumption, the rechargeable amount of the energy storage module is obtained, and the rechargeable amount is compared with the difference between the total regenerated power and the total power consumption.

[0051] When the rechargeable amount is greater than the difference between the total regenerated power and the total power consumption, the first switching component is controlled to be turned on so that the DC bus charges the energy storage module. The power conversion function of the AC / DC converter module is also acquired. If the AC / DC converter module has a rectification function, the AC / DC converter module is controlled to continuously charge the energy storage module according to a fourth preset power for a third preset duration. The third preset duration includes the duration during which the total regenerated power is greater than the total power consumption.

[0052] If the rechargeable amount is not greater than the difference between the total regenerated power and the total power consumption, the first switching component is controlled to be turned on so that the DC bus charges the energy storage module.

[0053] When the total regenerated power is not greater than the total power consumption, the power conversion function of the AC / DC conversion module is obtained, and when the AC / DC conversion module has a rectification function, the first switching component is controlled to turn off, and the AC / DC conversion module is controlled to continuously charge the energy storage module according to the fifth preset power for the fourth preset duration.

[0054] In one embodiment, the control method further includes:

[0055] The operating status of the energy storage module is obtained, and when the energy storage module is in a static state, the voltage of multiple batteries in the energy storage module is obtained, and the first battery with the highest voltage is selected.

[0056] Calculate the average voltage of the multiple batteries and control the passive resistor in the first battery to consume power until the difference between the voltage of the first battery and the average voltage is less than a preset difference.

[0057] In one embodiment, the DC bus is connected to the power grid via a third switching assembly, the energy storage system further includes multiple second switching assemblies, and the control method further includes:

[0058] Obtain the switching states of multiple third switch components;

[0059] When any of the third switch components is in the open state, the second switch component connected to the same DC bus as the third switch component is controlled to open.

[0060] Alternatively, electrical energy can be obtained from multiple of the third switching components;

[0061] When the electrical energy on any of the third switching components is zero, the second switching component connected to the same DC bus as the third switching component is disconnected.

[0062] In one embodiment, the control method further includes:

[0063] The electrical energy at the first terminal of the AC / DC conversion module is obtained, and the electrical energy at multiple third switching components is also obtained.

[0064] When the electrical energy at the first terminal of the AC / DC conversion module is zero and all the second switching components are disconnected, the energy storage system is controlled to enter a sleep mode.

[0065] When the electrical energy at the first terminal of the AC / DC conversion module or the electrical energy at any of the third switching components is not less than the preset electrical energy, the energy storage system is controlled to exit the hibernation mode and enter the operation mode.

[0066] In one embodiment, the control method further includes:

[0067] If the energy storage system is in hibernation mode and the voltage of the energy storage module is less than a preset low threshold, a shutdown warning is sent and the energy storage system is controlled to enter shutdown mode.

[0068] The energy storage system of this invention includes an energy storage module, a first switching assembly, an AC / DC conversion module, a voltage sampling module, and a main control module. The first terminal of the AC / DC conversion module is connected to the power grid, and the second terminal is electrically connected to the energy storage module. The AC / DC conversion module rectifies the AC power from the power grid and outputs it to the energy storage module to charge it. Alternatively, the AC / DC conversion module inverts the received DC power and outputs it to the power grid, transmitting DC power from the energy storage module or the DC bus to the power grid. The main control module controls the AC / DC conversion module to charge the energy storage module when the voltage of the energy storage module is less than a preset over-discharge threshold (i.e., the energy storage module's charge is insufficient), allowing the power grid to replenish the module. It also controls the first switching assembly to conduct, enabling the DC bus to charge the energy storage module, thereby storing the regenerated energy and realizing the recovery of regenerated energy.

[0069] The main control module is also used to control the AC-DC converter to invert the DC power output from the energy storage module and output it to the grid when the voltage of the energy storage module is greater than the preset overcharge threshold, that is, when the energy storage module has excess electrical energy. This is to transfer the excess electrical energy of the energy storage module to the grid to obtain electricity sales revenue. And / or, it controls the first switching component to conduct so that the energy storage module discharges to the DC bus, drives the equipment connected to the DC bus to operate, reduces the power draw from the grid, and lowers the cost of electricity.

[0070] With this configuration, the energy storage system of the present invention can store the regenerative energy of the equipment when the energy storage module is low on power, and can also release the stored energy to the grid when the energy storage module is fully charged to generate electricity sales revenue. It can also release the energy to the DC bus so that the equipment connected to the DC bus can use the excess energy of the energy storage module to work without having to obtain electricity from the grid, thereby saving corresponding electricity costs. This realizes the effective recovery and reuse of the equipment's regenerative energy and minimizes electricity costs. Attached Figure Description

[0071] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0072] Figure 1 This is a schematic diagram of a circuit structure according to an embodiment of the present invention;

[0073] Figure 2 This is a schematic diagram of the circuit structure of another embodiment of the present invention;

[0074] Figure 3 This is a schematic diagram of the circuit structure of another embodiment of the present invention;

[0075] Figure 4 This is a schematic diagram of a circuit structure according to another embodiment of the present invention;

[0076] Figure 5 This is a flowchart illustrating an embodiment of the present invention;

[0077] Figure 6 This is a flowchart illustrating another embodiment of the present invention;

[0078] Figure 7 This is a flowchart illustrating another embodiment of the present invention;

[0079] Figure 8 This is a flowchart illustrating another embodiment of the present invention;

[0080] Figure 9 This is a flowchart illustrating another embodiment of the present invention;

[0081] Figure 10 This is a flowchart illustrating another embodiment of the present invention;

[0082] Figure 11 This is a flowchart illustrating another embodiment of the present invention;

[0083] Figure 12 This is a flowchart illustrating another embodiment of the present invention;

[0084] Figure 13 This is a flowchart illustrating another embodiment of the present invention.

[0085] Explanation of icon numbers:

[0086] 10. Energy storage module; 20. First switching assembly; 30. AC / DC conversion module; 40. Voltage sampling module; 50. Main control module; 60. DC conversion module; 70. Second switching assembly; 80. Unidirectional conduction circuit.

[0087] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0088] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0089] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0090] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0091] Currently, all kinds of production and manufacturing equipment are being upgraded and transformed towards new energy, energy saving and power saving. This solution mainly involves equipment that can generate renewable energy, including elevators, lifting machinery and oil pumps. At present, the energy source of these devices is the mains power. According to statistics, the annual power consumption of elevators alone reaches 26 billion kWh nationwide. When the mains power fails, the equipment cannot operate reliably and stably, affecting the daily operation of the equipment. At the same time, when the equipment operates and drives the main circuit, it generates renewable energy. The current common way to deal with this is to dissipate it ineffectively in the form of heat energy by consuming resistors. There is a lack of effective recovery solutions, so there is a lot of energy waste.

[0092] To address the above problems, the present invention proposes an energy storage system. In one embodiment, referring to... Figure 1 Energy storage systems include:

[0093] Energy storage module 10, which is used to connect to multiple DC buses;

[0094] A first switch assembly 20, the first end of which is electrically connected to the energy storage module 10, and the second end of which is used to connect to multiple DC buses;

[0095] An AC / DC conversion module 30 is provided, with its first end connected to the power grid and its second end electrically connected to the energy storage module 10. The AC / DC conversion module 30 is used to rectify the AC power from the power grid and output it to the energy storage module 10, and / or, the AC / DC conversion module 30 is used to invert the received DC power and output it to the power grid.

[0096] Voltage sampling module 40, the voltage sampling module 40 is used to acquire the voltage of the energy storage module 10;

[0097] The main control module 50 is used to control the AC-DC conversion module 30 to invert the DC power output by the energy storage module 10 and output it to the power grid when the voltage of the energy storage module 10 is greater than the preset overcharge threshold, until the voltage of the energy storage module 10 is not greater than the preset overcharge threshold.

[0098] And / or, control the energy storage module 10 to discharge to the DC bus until the voltage of the energy storage module 10 is not greater than a preset overcharge threshold;

[0099] The main control module 50 is also used to control the AC-DC conversion module 30 to charge the energy storage module 10 when the voltage of the energy storage module 10 is less than the preset over-discharge threshold, until the voltage of the energy storage module 10 is not less than the preset over-discharge threshold.

[0100] And / or, control the DC bus to charge the energy storage module 10 until the voltage of the energy storage module 10 is not less than a preset over-discharge threshold;

[0101] Wherein, the preset overcharge threshold is greater than the preset over-discharge threshold.

[0102] In this embodiment, the energy storage module 10 is used to store and release electrical energy, and can be implemented by multiple cells connected in series. The cells can be implemented in various ways, including but not limited to supercapacitors, lithium batteries, storage batteries, or flow batteries. The voltage of the energy storage module 10 can be the voltage of a single cell or the sum of the voltages of multiple cells, and is not limited here.

[0103] It should be noted that there are multiple DC buses, and multiple DC buses correspond to multiple devices M1~Mn. The devices are connected to the power grid in sequence through DC / AC modules, DC buses and AC / DC modules.

[0104] In this embodiment, the voltage sampling module 40 and the energy storage module 10 can be separate independent circuits or integrated into the same circuit; no limitation is imposed here.

[0105] In this embodiment, the AC / DC conversion module 30 can be implemented as a DC / AC module to rectify the AC power from the grid and output it to the energy storage module 10 to replenish the energy storage module 10. Alternatively, the AC / DC conversion module 30 can be implemented as an AC / DC module to invert the DC power from the energy storage module 10 and / or the DC bus and output it to the grid to generate electricity sales revenue. The AC / DC conversion module 30 can also be implemented using a bidirectional AC / DC power conversion topology, which not only rectifies the AC power from the grid and outputs it to the energy storage module 10, but also inverts the DC power from the energy storage module 10 and / or the DC bus and outputs it to the grid.

[0106] It should be noted that when the AC / DC converter module 30 rectifies the AC power from the grid and outputs it to the energy storage module 10, the first switch assembly 20 can be turned off to ensure that all the DC power output after rectification is delivered to the energy storage module 10, thereby improving the charging efficiency of the energy storage module 10. Alternatively, the first switch assembly 20 can be turned on to allow the DC power output after rectification to be delivered to both the energy storage module 10 and the DC bus, enabling both the energy storage module 10 and the load to receive power simultaneously. Similarly, when the AC / DC converter module 30 inverts the DC power output from the energy storage module 10 and outputs it to the grid, the first switch assembly 20 can be turned off to ensure that all the electrical energy released by the energy storage module 10 is transmitted to the grid. Alternatively, the first switch assembly 20 can be turned on to allow the energy storage module 10 to discharge to the DC bus, not only generating revenue from electricity sales but also enabling the driving equipment to operate based on the previously recovered electrical energy from the energy storage module 10, achieving effective recovery and reuse of regenerative energy and minimizing electricity costs.

[0107] In this embodiment, the first switching component 20 can be implemented using at least one switching transistor, such as a MOSFET, IGBT, thyristor, transistor, power transistor, etc., and / or using at least one switching device, such as a contactor, circuit breaker, and relay.

[0108] In this embodiment, the voltage sampling module 40 is used to obtain the voltage of the energy storage module 10. Its implementation includes, but is not limited to, voltage sensors such as voltage divider resistors, Hall effect voltage sensors, or voltage transformers.

[0109] In this embodiment, the preset overcharge threshold is the highest safe voltage limit that the energy storage module 10 is allowed to reach. Continuing to charge beyond this value may lead to risks such as thermal runaway, lithium plating, and bulging. Therefore, when the voltage of the energy storage module 10 exceeds the preset overcharge threshold, the energy storage module 10 needs to be controlled to discharge. The preset overcharge threshold can be set according to the rated voltage of the energy storage module 10. For example, when the voltage of the energy storage module 10 is the voltage of a single cell, and the rated voltage of a single cell is 3.2V, the preset overcharge threshold can be set to 3.60~3.65V. The preset over-discharge threshold is the lowest safe voltage limit that the energy storage module 10 is allowed to reach during discharge. Continuing to discharge below this value may cause irreversible damage. Therefore, when the voltage of the energy storage module 10 is lower than the preset over-discharge threshold, the energy storage module 10 needs to be recharged. The preset over-discharge threshold can be set according to the nominal voltage of the energy storage module 10. For example, when the rated voltage of a single cell is 3.2V, the preset overcharge threshold can be set to 2.50~2.80V. Similarly, when the voltage of the energy storage module 10 is the rated voltage of multiple battery cells, and the rated voltage is 320V, the preset overcharge threshold can be set to 360V~365V, and the preset over-discharge threshold can be set to 250V~280V, without any restrictions.

[0110] It should be noted that the preset overcharge threshold and preset over-discharge threshold can be set manually based on the known rated voltage, or they can be calculated by the main control module based on the obtained rated voltage. For example, the rated voltage can be multiplied by the preset over-discharge percentage to obtain the preset over-discharge threshold, and the rated voltage can be multiplied by the preset overcharge percentage to obtain the preset overcharge threshold.

[0111] In this embodiment, the main control module 50 can be implemented using MCU (Microcontroller Unit), DSP (Digital Signal Processor), FPGA (Field Programmable Gate Array), SOC (System On Chip), etc.

[0112] Specifically, the energy storage system of the present invention includes an energy storage module 10, a first switching assembly 20, an AC / DC conversion module 30, a voltage sampling module 40, and a main control module 50. The first end of the AC / DC conversion module 30 is connected to the power grid, and the second end of the AC / DC conversion module 30 is electrically connected to the energy storage module 10. The AC / DC conversion module 30 is used to rectify the AC power from the power grid and output it to the energy storage module 10 to charge the energy storage module 10, and / or, the AC / DC conversion module 30 is used to invert the received DC power and output it to the power grid, so that the DC power from the energy storage module 10 or the DC bus can be sent to the power grid. The main control module 50 is used to control the AC / DC conversion module 30 to charge the energy storage module 10 when the voltage of the energy storage module 10 is less than a preset over-discharge threshold, i.e., when the energy storage module 10 has insufficient power, so that the power grid can supplement the power, and / or to control the first switching assembly 20 to conduct so that the DC bus can charge the energy storage module 10, thereby storing the regenerated energy of the equipment and realizing the recovery of regenerated energy.

[0113] The main control module 50 is also used to control the AC / DC conversion module 30 to invert the DC power output from the energy storage module 10 and output it to the power grid when the voltage of the energy storage module 10 is greater than the preset overcharge threshold, i.e., when the energy storage module 10 has excess electrical energy, so as to transfer the excess electrical energy of the energy storage module 10 to the power grid to obtain electricity sales revenue, and / or to control the first switching component 20 to conduct so that the energy storage module 10 discharges to the DC bus, drives the equipment connected to the DC bus to operate, reduces the power draw from the grid, and reduces electricity costs.

[0114] With this configuration, the energy storage system of the present invention can store the regenerative energy of the equipment when the power of the energy storage module 10 is insufficient, and can also release the stored electrical energy to the power grid when the power of the energy storage module 10 is sufficient to obtain electricity sales revenue. It can also release the energy to the DC bus so that the equipment on the DC bus can use the excess electrical energy of the energy storage module 10 to work without having to obtain electrical energy from the power grid, thereby saving corresponding electricity costs. This realizes the effective recovery and reuse of the equipment's regenerative energy and minimizes the cost of electricity.

[0115] In practical applications, the voltages of the energy storage module 10 and the DC bus may not be the same, so that the energy storage module 10 cannot directly discharge to the DC bus, and the DC bus cannot directly charge the energy storage module 10.

[0116] In this regard, in one embodiment of the present invention, reference is made to... Figure 2 The energy storage system further includes:

[0117] A DC-DC converter module 60 is provided, with its first end connected to the energy storage module 10 and the second end of the AC-DC converter module 30, respectively. The second end of the DC-DC converter module 60 is used to connect to a DC bus. The controlled end of the DC-DC converter module 60 is electrically connected to the main control module 50.

[0118] In this embodiment, the DC-DC converter module 60 can be implemented as a bidirectional DC / DC module to convert the DC voltage output from the energy storage module 10 and output the same voltage as the DC bus to the DC bus, thereby driving the equipment connected to the DC bus, reducing power draw from the grid, and lowering electricity costs. Alternatively, it can convert the voltage on the DC bus and output the same voltage as the energy storage module 10, enabling the energy storage module 10 to recover the regenerative energy generated by the equipment.

[0119] It should be noted that in scenarios involving the coordinated operation of multiple devices (such as multiple elevators, multiple cranes, or multi-station equipment on a production line), there are usually both energy generation and energy consumption ends within the system simultaneously. For example, a descending elevator regenerates electrical energy back to the DC bus due to potential energy recovery, while an ascending elevator absorbs electrical energy from the DC bus to drive its motor. When the main control module 50 turns on the first switching component 20, a low-impedance bidirectional path is formed between the energy storage module 10 and the DC bus. At this time, the energy storage module 10 can both absorb regenerative electrical energy and discharge to the load device.

[0120] However, if the total power consumption continues to exceed the total regenerated power (i.e., the net power flow is from the bus to the load), then if the initial power is already low (e.g., the voltage is close to or below the preset over-discharge threshold), continuous discharge may cause the energy storage module 10 to suffer capacity decay or irreversible damage due to deep over-discharge.

[0121] In one embodiment of the present invention, reference is made to... Figure 3 The energy storage system further includes:

[0122] The unidirectional conduction circuit 80 has its first terminals, the energy storage module 10 and the first switch assembly 20, electrically connected to the cathode of the unidirectional conduction circuit 80, and the anode of the unidirectional conduction circuit 80 is used to connect to the DC bus.

[0123] In this embodiment, the unidirectional conduction circuit 80 can be implemented using at least one diode, with the cathode of the diode being the output terminal of the unidirectional conduction circuit 80 and the anode being the input terminal of the unidirectional conduction circuit 80.

[0124] In this embodiment, the main control module 50 can control the first switch component 20 to turn off when it detects that the voltage of the energy storage module 10 is lower than the preset over-discharge threshold and the total power consumption of multiple devices is greater than the total regenerated power. Due to the unidirectional conduction characteristic of the unidirectional conduction circuit 80, only one unidirectional charging path is maintained between the DC bus and the energy storage module 10 (current can flow from the DC bus to the energy storage module 10 through the unidirectional conduction circuit 80, but cannot flow in the reverse direction), so that the energy storage module 10 can only draw power from the DC bus and cannot discharge to the DC bus.

[0125] With this configuration, the unidirectional conduction circuit 80 effectively blocks the discharge path of the energy storage module 10 to the DC bus, preventing it from falling into deep over-discharge due to continuous external power supply when the battery is low. If there is regenerative energy on the DC bus, it can passively flow into the energy storage module 10 for supplementary charging, causing its voltage to rise back to above the preset over-discharge threshold, significantly improving battery safety and cycle life.

[0126] In one embodiment of the present invention, reference is made to... Figure 4 The energy storage system further includes multiple second switch components 70, the first ends of the multiple second switch components 70 are electrically connected to the second ends of the first switch component 20, the second ends of the multiple second switch components 70 are electrically connected to multiple DC buses one by one, and the controlled ends of the second switch components 70 are electrically connected to the main control module 50.

[0127] In this embodiment, the second switching component 70 can be implemented using at least one switching transistor, such as a MOSFET, IGBT, thyristor, transistor, power transistor, etc., and / or using at least one switching device, such as a contactor, circuit breaker, and relay.

[0128] In this embodiment, when the main control module 50 detects a fault in any device, it controls the second switch assembly 70 connected to the DC bus corresponding to the device to disconnect, so as to prevent the energy storage module 10 from discharging to the faulty device and causing an accident.

[0129] This invention also proposes a control method for an energy storage system, applied to the aforementioned energy storage system, with reference to... Figure 5 The control method includes:

[0130] Step S100: Obtain the voltage of the energy storage module 10;

[0131] Step S200: When the voltage of the energy storage module 10 is greater than the preset overcharge threshold, the AC-DC conversion module 30 is controlled to invert the DC power output by the energy storage module 10 and output it to the grid until the voltage of the energy storage module 10 is not greater than the preset overcharge threshold.

[0132] And / or, control the first switching component 20 to turn on, so that the energy storage module 10 discharges to the DC bus until the voltage of the energy storage module 10 is not greater than a preset overcharge threshold;

[0133] When the voltage of the energy storage module 10 is less than a preset over-discharge threshold, the AC / DC conversion module 30 is controlled to charge the energy storage module 10 until the voltage of the energy storage module 10 is not less than the preset over-discharge threshold.

[0134] And / or, control the first switching component 20 to turn on so that the DC bus charges the energy storage module 10 until the voltage of the energy storage module 10 is not less than a preset over-discharge threshold.

[0135] Specifically, the energy storage system includes an energy storage module 10, a first switching assembly 20, an AC / DC converter module 30, a voltage sampling module 40, and a main control module 50. The first terminal of the AC / DC converter module 30 is connected to the power grid, and the second terminal is electrically connected to the energy storage module 10. The AC / DC converter module 30 is used to rectify the AC power from the power grid and output it to the energy storage module 10 to charge it. Alternatively, the AC / DC converter module 30 is used to invert the received DC power and output it to the power grid, so that the DC power from the energy storage module 10 or the DC bus can be sent to the power grid. The main control module 50 is used to control the AC / DC converter module 30 to charge the energy storage module 10 when the voltage of the energy storage module 10 is less than a preset over-discharge threshold, i.e., when the energy storage module 10 has insufficient power, so that the power grid replenishes it. It is also used to control the first switching assembly 20 to conduct, so that the DC bus can charge the energy storage module 10, thereby storing the regenerated energy and realizing the recovery of regenerated energy.

[0136] The main control module 50 is also used to control the AC / DC conversion module 30 to invert the DC power output from the energy storage module 10 and output it to the power grid when the voltage of the energy storage module 10 is greater than the preset overcharge threshold, i.e., when the energy storage module 10 has excess electrical energy, so as to transfer the excess electrical energy of the energy storage module 10 to the power grid to obtain electricity sales revenue, and / or to control the first switching component 20 to conduct so that the energy storage module 10 discharges to the DC bus, drives the equipment connected to the DC bus to operate, reduces the power draw from the grid, and reduces electricity costs.

[0137] With this configuration, the control method of the energy storage system of the present invention can store the regenerative energy of the device when the power of the energy storage module 10 is insufficient, and can also release the stored electrical energy to the power grid when the power of the energy storage module 10 is sufficient to obtain electricity sales revenue. It can also release the energy to the DC bus so that the devices on the DC bus can use the excess electrical energy of the energy storage module 10 to work without having to obtain electrical energy from the power grid, thereby saving corresponding electricity costs. This realizes the effective recovery and reuse of the device's regenerative energy and minimizes the cost of electricity.

[0138] In one embodiment of the present invention, reference is made to... Figure 6 The step of controlling the AC / DC converter 30 to invert the DC power output from the energy storage module 10 and output it to the power grid when the voltage of the energy storage module 10 is greater than a preset overcharge threshold, until the voltage of the energy storage module 10 is not greater than the preset overcharge threshold; and / or controlling the first switching component 20 to conduct so that the energy storage module 10 discharges to the DC bus until the voltage of the energy storage module 10 is not greater than the preset overcharge threshold includes:

[0139] Step S201: Obtain the power conversion function of the AC / DC conversion module 30;

[0140] Step S202: When the AC / DC conversion module 30 is capable of performing the inverter function, control the first switch assembly 20 to turn off, and control the AC / DC conversion module 30 to invert the DC power output by the energy storage module 10 according to the rated power and output it to the grid until the voltage of the energy storage module 10 is not greater than the preset overcharge threshold.

[0141] When the AC / DC conversion module 30 is unable to perform the inverter function, the control equipment scheduling center prioritizes the operation of equipment with motor power greater than the preset power to consume electricity, so that the total power consumption of multiple devices is greater than the total regenerated power of multiple devices, and controls the first switching component 20 to conduct, so that the energy storage module 10 discharges to the DC bus until the voltage of the energy storage module 10 is not greater than the preset overcharge threshold.

[0142] In this embodiment, the AC / DC converter module 30 can perform at least one of the power conversion functions of rectification and inversion. When the voltage of the energy storage module 10 is greater than the preset overcharge threshold, the main control module 50 first obtains the power conversion function of the AC / DC converter module 30. When it detects that the AC / DC converter module 30 can perform the inversion function, it controls the first switch component 20 to turn off and controls the AC / DC converter module 30 to invert the excess power of the energy storage module 10 and transmit it to the grid. In this way, not only can the energy storage module 10 be prevented from being overcharged and the service life of the energy storage module 10 be extended, but the electricity sales revenue from the grid can also be obtained.

[0143] If the main control module 50 detects that the AC / DC converter module 30 cannot perform the inverter function, it controls the equipment dispatch center to prioritize the operation of devices with motor power exceeding the preset power. This ensures that the total power consumption of multiple devices exceeds the total regenerated power of the multiple devices. In this way, multiple devices can consume excess energy from the energy storage module 10, causing the voltage of the energy storage module 10 to drop below the preset overcharge threshold, preventing the energy storage module 10 from being overcharged and extending its service life. It should be noted that the equipment dispatch center is the equipment's backend control center.

[0144] In one embodiment of the present invention, reference is made to... Figure 7 The step of controlling the AC / DC converter 30 to charge the energy storage module 10 when the voltage of the energy storage module 10 is less than a preset over-discharge threshold, until the voltage of the energy storage module 10 is not less than the preset over-discharge threshold; and / or controlling the first switching component 20 to conduct so that the DC bus charges the energy storage module 10 until the voltage of the energy storage module 10 is not less than the preset over-discharge threshold includes:

[0145] Step S210: Obtain the total regeneration power and total power consumption of multiple devices, and compare the total regeneration power and the total power consumption;

[0146] Step S220: When the total regenerated power is greater than the total power consumption, control the first switching component 20 to be turned on so that the DC bus charges the energy storage module 10;

[0147] When the total regenerated power is not greater than the total power consumption, the power conversion function of the AC-DC converter module 30 is obtained, and when the AC-DC converter module 30 is able to perform the rectification function, the first switch assembly 20 is controlled to turn off, and the AC-DC converter module 30 is controlled to rectify the AC power of the grid and output DC power to the energy storage module 10 to charge the energy storage module 10.

[0148] It should be noted that when the total regenerated power is greater than the total power consumption, it indicates that the DC bus can charge the energy storage module 10. Therefore, the main control module 50 can control the first switch component 20 to be turned on so that the energy storage module 10 can store the regenerated power of the device, thereby realizing the recovery of regenerated power. The recovery benefit is equal to the difference between the total regenerated power and the total power consumption multiplied by the current electricity price.

[0149] When the total regenerated power is not greater than the total power consumption, and the first switching component 20 is turned on, the charging amount from multiple DC buses to the energy storage module 10 is greater than the power drawn from the energy storage module 10, so that the energy storage module 10 will be in a net discharge state. At this time, only the AC / DC converter module 30 may charge the energy storage module 10. Therefore, the main control module 50 needs to acquire the power conversion function of the AC / DC converter module 30, and if the AC / DC converter module 30 can perform the rectification function, control the first switching component 20 to turn off, and control the AC / DC converter module 30 to rectify the AC power from the grid and output DC power to the energy storage module 10 to charge the energy storage module 10, thereby preventing the voltage of the energy storage module 10 from being lower than the preset over-discharge threshold for a long time and extending the service life of the energy storage module 10.

[0150] It should be noted that in scenarios involving the coordinated operation of multiple devices (such as multiple elevators, multiple cranes, or multi-station equipment on a production line), there are usually both energy generation and energy consumption ends within the system simultaneously. For example, a descending elevator regenerates electrical energy back to the DC bus due to potential energy recovery, while an ascending elevator absorbs electrical energy from the DC bus to drive its motor. When the main control module 50 turns on the first switching component 20, a low-impedance bidirectional path is formed between the energy storage module 10 and the DC bus. At this time, the energy storage module 10 can both absorb regenerative electrical energy and discharge to the load device.

[0151] However, if the total power consumption continues to exceed the total regenerated power (i.e., the net power flow is from the bus to the load), the energy storage module 10 will be in a net discharge state. If its initial power is already low (e.g., the voltage is close to or below the preset over-discharge threshold), continuous discharge may cause the energy storage module 10 to suffer capacity decay or irreversible damage due to deep over-discharge.

[0152] In one embodiment of the present invention, step S220 includes:

[0153] When the energy storage system includes a unidirectional conduction circuit 80, the first switching assembly 20 is controlled to turn off so that the DC bus charges the energy storage module 10.

[0154] In the absence of a unidirectional conduction circuit 80 in the energy storage system, the first switching assembly 20 is controlled to turn off, and the power conversion function of the AC / DC conversion module 30 is obtained.

[0155] When the AC / DC converter module 30 is capable of performing rectification, the AC / DC converter module 30 is controlled to rectify the AC power of the power grid and output DC power to the energy storage module 10 according to the first preset power, so as to charge the energy storage module 10 until the voltage of the energy storage module 10 is not less than the preset over-discharge threshold.

[0156] If the AC / DC conversion module 30 is unable to perform the rectification function, the energy storage system is controlled to enter a sleep mode;

[0157] The first ends of the energy storage module 10 and the first switch assembly 20 are both electrically connected to the output end of the unidirectional conduction circuit 80, and the input end of the unidirectional conduction circuit 80 is used to connect to the DC bus.

[0158] It should be noted that when the energy storage system includes a unidirectional conduction circuit 80, thanks to the unidirectional conduction characteristic of the circuit 80, only one unidirectional charging path is maintained between the DC bus and the energy storage module 10 (current can flow from the DC bus to the energy storage module 10 through the unidirectional conduction circuit 80, but cannot flow in the reverse direction). This ensures that the energy storage module 10 can only draw power from the DC bus and cannot discharge to it. With this configuration, the unidirectional conduction circuit 80 effectively blocks the discharge path from the energy storage module 10 to the DC bus, preventing it from falling into deep over-discharge due to continuous power supply when its charge is low. If regenerative energy exists on the DC bus, it can passively flow into the energy storage module 10 for supplementary charging, causing its voltage to rise above the preset over-discharge threshold, significantly improving the safety and cycle life of the energy storage module 10.

[0159] Therefore, when the energy storage system includes a unidirectional conduction circuit 80, the main control module 50 can control the first switching component 20 to turn off. This not only effectively blocks the discharge path of the energy storage module 10 to the DC bus, preventing it from falling into deep over-discharge due to continuous external power supply in a low-charge state, but also allows regenerative energy to passively flow into the energy storage module 10 for supplementary charging if regenerative energy exists on the DC bus. This causes its voltage to rise back above the preset over-discharge threshold, significantly improving battery safety and cycle life.

[0160] In the absence of a unidirectional conduction circuit 80 in the energy storage system, the first switching component 20 is turned off to prevent the energy storage module 10 from discharging to the DC bus when its voltage is below the preset over-discharge threshold. The power conversion function of the AC / DC converter module 30 is then utilized. If the AC / DC converter module 30 can perform rectification, it is controlled to rectify the AC power from the grid and output DC power to the energy storage module 10 according to a first preset power, thereby charging the energy storage module 10 and causing its voltage to rise above the preset over-discharge threshold, significantly improving battery safety and cycle life. The first preset power can be the rated power of the energy storage module 10 or can be set according to actual conditions; no restriction is placed here. In this case, the regenerative energy recovery benefit W1 = (Q2 - Q0) × current electricity price, where Q2 is the rechargeable amount of the energy storage module 10, which is the difference between the current charge of the energy storage module 10 and the charge when the voltage of the energy storage module 10 is at the preset over-discharge threshold, and Q0 is the difference between the total regenerated charge and the total consumed charge.

[0161] When the AC / DC converter module 30 is unable to perform rectification, the energy storage module 10 cannot obtain electrical energy. At this time, the energy storage system enters a sleep mode to prevent it from discharging externally, thus avoiding further depletion of the energy storage module 10's charge and preventing capacity decay or irreversible damage due to deep over-discharge. It should be noted that when the energy storage system enters sleep mode, the AC / DC converter module 30 shuts down, and the voltage sampling module 40 and the main control module 50 periodically enter sleep mode to reduce energy consumption of the energy storage module 10 and save energy.

[0162] In one embodiment of the present invention, reference is made to... Figure 8 After obtaining the voltage of the energy storage module 10, the method further includes:

[0163] Step S300: When the voltage of the energy storage module 10 is not greater than the preset overcharge threshold and not less than the preset over-discharge threshold, obtain the actual electricity price for the current time period and compare the actual electricity price with the preset electricity price.

[0164] Step S400: When the actual electricity price is greater than the preset electricity price, obtain the power conversion function of the AC / DC conversion module 30, and when the AC / DC conversion module 30 has an inverter function, control the AC / DC conversion module 30 to invert the DC power output by the energy storage module 10 and output it to the power grid.

[0165] When the actual electricity price is not greater than the preset electricity price, the power conversion function of the AC / DC conversion module 30 is acquired, and when the AC / DC conversion module 30 has a rectification function, the AC / DC conversion module 30 is controlled to charge the energy storage module 10. The preset electricity price is a configurable parameter, and its value is determined based on at least one of the following: local time-of-use electricity pricing policy, historical electricity price data, or user-defined strategy.

[0166] It should be noted that when the voltage of the energy storage module 10 is not greater than the preset overcharge threshold and not less than the preset over-discharge threshold, its state of charge is within a safe and usable range. Under this condition, the main control module 50 can dynamically execute a peak-valley arbitrage strategy based on real-time or time-of-use electricity price information. The peak-valley arbitrage strategy is as follows:

[0167] If the current electricity price is higher than the preset price, it indicates that the electricity price is high during this period, making it suitable to release the stored energy from the energy storage module 10 to the grid to generate revenue during periods of high electricity prices. Therefore, when the current electricity price is higher than the preset price, the main control module 50 acquires the power conversion function of the AC / DC converter module 30. If the AC / DC converter module 30 has an inverter function, it controls the AC / DC converter module 30 to invert the DC power output from the energy storage module 10 before outputting it to the grid to generate revenue during periods of high electricity prices. If the AC / DC converter module 30's power conversion function does not have an inverter function, the above strategy is not executed.

[0168] If the current electricity price is not higher than the preset price, it indicates that the electricity price is low during this period, making it suitable to store the grid's electrical energy and release it to the grid for sale during a later period when the electricity price is higher, thus profiting from the price difference. Therefore, in this case, the main control module 50 utilizes the power conversion function of the AC / DC converter module 30. If the AC / DC converter module 30 has a rectification function, it controls the AC / DC converter module 30 to charge the energy storage module 10 to store the low-priced electrical energy and release it to the grid for sale during a later period when the electricity price is higher, thereby profiting from the price difference. If the AC / DC converter module 30's power conversion function does not have a rectification function, the above strategy is not executed.

[0169] Furthermore, when the state of charge of the energy storage module 10 is within a safe and usable range, not only can peak-valley arbitrage strategies be executed, but power can also be supplied to devices that require power. In one embodiment, referring to... Figure 9 The step of acquiring the power conversion function of the AC / DC converter module 30 when the actual electricity price is greater than the preset electricity price, and controlling the AC / DC converter module 30 to invert the DC power output from the energy storage module 10 and output it to the power grid when the AC / DC converter module 30 has an inverter function, includes:

[0170] Step S410: Obtain the total regeneration power and total power consumption of multiple devices, and compare the total regeneration power and the total power consumption;

[0171] Step S411: When the total regenerated power is greater than the total power consumption, the power conversion function of the AC / DC converter module 30 is acquired. When the AC / DC converter module 30 has an inverter function, the first switch assembly 20 is turned on, and the AC / DC converter module 30 is controlled to continuously invert the DC power output from the energy storage module 10 and the DC power on the DC bus and output them to the power grid according to the second preset power for a first preset duration. The first preset duration includes the duration during which the total regenerated power is greater than the total power consumption.

[0172] If the total regenerated power is not greater than the total power consumption, the discharge capacity of the energy storage module 10 is obtained, and the discharge capacity is compared with the difference between the total regenerated power and the total power consumption.

[0173] When the dischargeable amount is greater than the difference between the total regenerated power and the total power consumption, the first switching component 20 is controlled to be turned on so that the energy storage module 10 discharges to the DC bus. The power conversion function of the AC / DC converter module 30 is also acquired. When the AC / DC converter module 30 is able to perform the inverter function, the AC / DC converter module 30 is controlled to continuously invert the DC power output by the energy storage module 10 and output it to the grid according to the third preset power for a first preset duration. The second preset duration includes the duration during which the total regenerated power is not greater than the total power consumption.

[0174] It should be noted that when the total regenerated power exceeds the total power consumption, it indicates that the system as a whole is in a state of net energy surplus: most devices are in energy feedback mode (such as descending elevators and braking motors), only a small number of devices consume power, the DC bus exhibits low load and high feedback voltage characteristics, and there is a considerable surplus of regenerated power on the bus. In this case, the stored power can be fed into the grid after being inverted by the AC / DC conversion module 30, and the first switching component 20 is controlled to be turned on so that the regenerated power on the DC bus is released to the grid through the AC / DC conversion module, thereby maximizing the use of high electricity price periods to obtain electricity sales revenue. Among them, the second preset power can be taken as P2=(Q1+Q0) / t1, where Q1 is the discharge capacity of the energy storage module 10, which is the difference between the current power of the energy storage module 10 and the power when the voltage of the energy storage module 10 is at the preset over-discharge threshold, Q0 is the difference between the total regenerated power and the total power consumption, and t1 is the first preset duration, that is, the duration during which the total regenerated power exceeds the total power consumption. It should be noted that when the calculated P2 is greater than the rated power, P2 is taken as the rated power, and then the first preset duration t1 is calculated as (Q1+Q0) / rated power. At this time, the electricity sales revenue W1 is (Q1+Q0) × the current electricity price.

[0175] Conversely, when the total regenerated electricity is not greater than the total power consumption, it indicates that the system is in a state of net energy deficit, most devices are consuming electricity, and the DC bus load demand is high. At this time, the energy storage module 10 can control the first switching component 20 to conduct while feeding power to the grid to obtain high electricity price revenue, and discharge to the DC bus in coordination to meet the load's power demand, thus achieving the dual goals of "increasing revenue from electricity sales" and "ensuring supply and reducing costs"—earning revenue from the electricity price difference while reducing the additional expenditure of purchasing electricity from the grid during high-price periods, further improving the overall economic benefits of the system.

[0176] Considering that when the energy storage module 10 has a low power level, it may not be able to discharge to the grid while simultaneously discharging to the DC bus, it is necessary to obtain the discharge capacity of the energy storage module 10 and compare the discharge capacity with the difference between the total regenerated power and the total power consumption, provided that the total regenerated power is not greater than the total power consumption.

[0177] If the discharge capacity is greater than the difference between the total regenerated power and the total power consumption, it indicates that the energy storage module 10 has sufficient power to discharge to the DC bus simultaneously with the grid. Therefore, in this case, the first switching component 20 is turned on to allow the energy storage module 10 to discharge to the DC bus, meeting the load's power demand. Furthermore, if the AC / DC converter module 30 is capable of performing its inverter function, it is controlled to continuously invert the DC power output from the energy storage module 10 and output it to the grid within a first preset duration, according to a third preset power. The third preset power is P3 = (Q1 - Q0) / t2, where t2 is the second preset duration, i.e., the duration during which the total regenerated power is not greater than the total power consumption. It should be noted that when the calculated P3 is greater than the rated power, P3 is taken as the rated power, and the second preset duration t2 = (Q1 - Q0) / rated power is then calculated. In this case, the electricity sales revenue W2 = (Q1 - Q0) × the current electricity price.

[0178] If the discharge capacity is not greater than the difference between the total regeneration current and the total power consumption, it indicates that the power of the energy storage module 10 is low and insufficient to meet the power consumption demand of the load. In this case, the energy storage module 10 can be kept in a static state to avoid capacity decay or irreversible damage caused by deep over-discharge.

[0179] In another embodiment, reference Figure 10 The step of acquiring the power conversion function of the AC / DC converter module 30 when the actual electricity price is not greater than the preset electricity price, and controlling the AC / DC converter module 30 to charge the energy storage module 10 when the AC / DC converter module 30 has a rectification function, includes:

[0180] Step S420: Obtain the total regeneration power and total power consumption of multiple devices, and compare the total regeneration power and the total power consumption;

[0181] Step S421: If the total regenerated power is greater than the total power consumption, obtain the rechargeable amount of the energy storage module 10, and compare the rechargeable amount with the difference between the total regenerated power and the total power consumption;

[0182] Step S422: When the rechargeable amount is greater than the difference between the total regenerated power and the total power consumption, control the first switching component 20 to conduct so that the DC bus charges the energy storage module 10. Also acquire the power conversion function of the AC / DC converter module 30. If the AC / DC converter module 30 has a rectification function, control the AC / DC converter module 30 to continuously charge the energy storage module 10 according to a fourth preset power for a third preset duration. The third preset duration includes the duration during which the total regenerated power is greater than the total power consumption.

[0183] If the rechargeable amount is not greater than the difference between the total regenerated power and the total power consumption, the first switching component 20 is controlled to be turned on so that the DC bus charges the energy storage module 10.

[0184] Step S423: When the total regenerated power is not greater than the total power consumption, obtain the power conversion function of the AC / DC conversion module 30, and when the AC / DC conversion module 30 has a rectification function, control the first switch component 20 to turn off, and control the AC / DC conversion module 30 to continuously charge the energy storage module 10 according to the fifth preset power for the fourth preset duration.

[0185] It should be noted that when the total regenerated electricity exceeds the total consumed electricity, it indicates that the system is in a state of net energy surplus. Since the electricity price is low at this time, it is not suitable to discharge electricity to the grid to obtain sales revenue. Instead, it is suitable to store the regenerated energy for sale when the electricity price is higher later. In this case, the first switching component 20 can be turned on to charge the energy storage module 10 via the DC bus, thereby storing the regenerated energy.

[0186] To prevent overcharging of the energy storage module 10 due to excessive injection of regenerated energy, it is also necessary to obtain the rechargeable amount of the energy storage module 10. The rechargeable amount is the difference between the current power of the energy storage module 10 and the power when the voltage of the energy storage module 10 is at the preset overcharge threshold. When the rechargeable amount is greater than the difference between the total regenerated power and the total power consumption, it indicates that the energy storage module 10 has sufficient margin to accommodate all the regenerated energy and still has a surplus to accept external power. Therefore, the first switching component 20 can be turned on, and the AC / DC conversion module 30 and the DC bus can be controlled to charge the energy storage module 10 together. At this time, the fourth preset power is P4=(Q2-Q0) / t3, where Q2 is the rechargeable amount and t3 is the third preset duration, that is, the duration during which the total regenerated power is greater than the total power consumption. It should be noted that when the calculated P4 is greater than the rated power, P4 is taken as the rated power and t3 is taken as (Q2-Q0) / rated power. The regenerated energy recovery benefit in this case is W3=-(Q2-Q0)×current electricity price. If the rechargeable amount is not greater than the difference between the total regenerated power and the total power consumption, it indicates that the energy storage module 10 may be overcharged when receiving regenerated power. Therefore, in this case, the first switch assembly 20 is disconnected to prevent the energy storage module 10 from being overcharged.

[0187] If the rechargeable amount is not greater than the difference between the total regenerated power and the total power consumption, it indicates that the energy storage module 10 can store less electrical energy under this condition. Therefore, in this case, the first switching component 20 can be turned on, and only the DC bus can be controlled to charge the energy storage module 10, and grid power supplementation is prohibited to prevent the energy storage module 10 from triggering protection or being damaged due to overcharging.

[0188] When the total regenerated power is not greater than the total power consumption, it indicates that the system is in a state of net energy deficit, most devices are consuming power, and the DC bus load demand is high. Therefore, at this time, only the AC / DC converter module 30, which can perform rectification, can charge the energy storage module 10 to store the low-priced electricity. At this time, the fifth preset power can be taken as the rated power, the fourth preset duration is the quotient obtained by dividing the rechargeable amount by the rated power, and the regenerated energy recovery revenue W4 = -(Q2 - Q0) × current electricity price.

[0189] In one embodiment of the present invention, reference is made to... Figure 11 The control method further includes:

[0190] Step S500: Obtain the operating status of the energy storage module 10, and when the energy storage module 10 is in a static state, obtain the voltage of multiple batteries of the energy storage module 10, and select the first battery with the highest voltage.

[0191] Step S600: Calculate the average voltage of the multiple batteries and control the passive resistor in the first battery to consume power until the difference between the voltage of the first battery and the average voltage is less than a preset difference.

[0192] It should be noted that the operating state includes the discharge state, the charging state, and the stationary state. When the energy storage module 10 is in the stationary state, the energy storage module 10 neither discharges nor charges.

[0193] It should be noted that even when the energy storage module 10 is completely idle and without charging or discharging current, the discharge levels of each individual battery will still differ due to inconsistencies in self-discharge rates or uneven temperature distribution. If left unaddressed for a long period, this will exacerbate the inconsistent decay of usable capacity among the batteries, significantly shortening the cycle life and usable energy of the entire battery pack. Therefore, this invention selects the battery with the highest voltage and controls the conduction of its integrated passive balancing resistor path, allowing it to discharge with a small current until the difference between the battery's voltage and the average voltage is less than a preset difference. This means the battery's voltage tends to approach the average voltage of the multiple batteries, preventing large capacity differences among the batteries. The preset difference is the pre-set absolute value of the maximum allowable deviation between the individual battery voltage and the average voltage of the battery pack.

[0194] In one embodiment of the present invention, reference is made to... Figure 12 and Figure 4 The DC bus is connected to the power grid through the third switch assembly K1~Kn. The energy storage system also includes multiple second switch assemblies 70. The control method further includes:

[0195] Step S701: Obtain the switching states of the plurality of the third switch components;

[0196] Step S801: When any of the third switch components is in the open state, control the second switch component 70 connected to the same DC bus as the third switch component to be disconnected;

[0197] Alternatively, step S702: Obtain electrical energy from the plurality of the third switching components;

[0198] Step S802: When the electrical energy on any of the third switching components is zero, control the second switching component 70 connected to the same DC bus as the third switching component to disconnect.

[0199] It should be noted that the third switch assembly is used to turn off when the corresponding connected equipment fails and to turn on when the equipment is normal. Therefore, when any third switch assembly is in the off state, the second switch assembly 70 connected to the same DC bus is controlled to disconnect, so as to prevent the energy storage module 10 from discharging to the faulty equipment and improve the safety of the equipment.

[0200] Furthermore, since the electrical energy of the third switch assembly is essentially zero when it is turned off, it is possible to determine whether the corresponding connected equipment is faulty by acquiring the electrical energy on the third switch assembly. If it is determined that the corresponding connected equipment is faulty, the second switch assembly 70 connected to the same DC bus of the third switch assembly can be disconnected to prevent the energy storage module 10 from discharging to the faulty equipment and improve the safety of the equipment.

[0201] In one embodiment of the present invention, reference is made to... Figure 13 The control method further includes:

[0202] Step S900: Obtain the electrical energy at the first terminal of the AC / DC conversion module 30, and also obtain the electrical energy at the multiple third switching components;

[0203] Step S1000: When the electrical energy at the first terminal of the AC / DC conversion module 30 is zero and all the second switching components 70 are disconnected, the energy storage system is controlled to enter a sleep mode.

[0204] When the electrical energy at the first terminal of the AC / DC conversion module 30 or the electrical energy at any of the third switching components is not less than the preset electrical energy, the energy storage system is controlled to exit the hibernation mode and enter the operation mode.

[0205] It should be noted that when the voltage, current, and power at the first terminal of the AC / DC converter module 30 are all zero, its electrical energy is zero. When the electrical energy at the first terminal of the AC / DC converter module 30 is zero and multiple second switching components 70 are open, it indicates a power outage. At this time, the energy storage system is controlled to enter a sleep mode, that is, the AC / DC converter module 30 is shut down, and the voltage sampling module 40 and the main control module 50 periodically enter sleep mode to reduce the power consumption of the energy storage module 10 and save energy. When the electrical energy at the first terminal of the AC / DC converter module 30 is not less than the preset electrical energy, it indicates that the power grid is powered on. At this time, the energy storage system can be controlled to enter the operating state so that the AC / DC converter module 30 can charge the energy storage module 10 or invert the electrical energy released by the energy storage module 10 and output it to the power grid. If the electrical energy on any of the third switch components is not less than the preset electrical energy, it indicates that the device connected to the third switch component has returned to normal, so that the third switch component is turned on. At this time, the energy storage system is controlled to enter the operation mode so that the energy storage module 10 can supply power to the device that has returned to work, or receive the regenerative energy generated by it.

[0206] In one embodiment of the present invention, the control method further includes:

[0207] When the energy storage system is in hibernation mode and the voltage of the energy storage module 10 is less than a preset low threshold, a shutdown warning is sent and the energy storage system is controlled to enter shutdown mode.

[0208] It should be noted that even when the energy storage system is in sleep mode, which can significantly reduce the power consumption of the energy storage module 10, the voltage of the energy storage module 10 may slowly drop during sleep due to self-discharge, micro-short circuits, or continuous power consumption by background loads. Without intervention, this will lead to deep over-discharge of the energy storage module 10. Therefore, when the energy storage system is in sleep mode and the voltage of the energy storage module 10 is lower than a preset low threshold, a shutdown warning is issued, such as an audible warning, a visual warning, or a vibration warning, to remind the user that the power of the energy storage module 10 is too low and needs to be charged in time. The system is also controlled to enter shutdown mode to further reduce the power consumption of the energy storage module 10, prevent the energy storage module 10 from being deeply over-discharged, and ensure the safety of the energy storage module 10.

[0209] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. An energy storage system, characterized in that, include: Energy storage module; A first switching assembly, with a first end electrically connected to the energy storage module, and a second end of the first switching assembly used to connect to multiple DC buses; the DC buses are located between the power grid and the renewable energy equipment. An AC / DC conversion module is provided, wherein a first terminal of the AC / DC conversion module is used to connect to the power grid, and a second terminal of the AC / DC conversion module is electrically connected to the energy storage module. The AC / DC conversion module is used to rectify the AC power from the power grid and output it to the energy storage module, and / or, the AC / DC conversion module is used to invert the received DC power and output it to the power grid. A voltage sampling module, used to acquire the voltage of the energy storage module; The main control module is used to control the AC-DC conversion module to invert the DC power output by the energy storage module and output it to the grid when the voltage of the energy storage module is greater than a preset overcharge threshold, until the voltage of the energy storage module is no greater than the preset overcharge threshold. And / or, control the first switching component to turn on, so that the energy storage module discharges to the DC bus until the voltage of the energy storage module is not greater than a preset overcharge threshold; The main control module is also used to obtain the total regenerated power and total power consumption of multiple devices when the voltage of the energy storage module is less than a preset over-discharge threshold, and to compare the total regenerated power and the total power consumption. When the total regenerated power is greater than the total power consumption, the first switching component is controlled to be turned on so that the DC bus charges the energy storage module; When the total regenerated power is not greater than the total power consumption, the power conversion function of the AC-DC converter is obtained, and when the AC-DC converter can perform the rectification function, the first switching component is controlled to turn off, and the AC-DC converter is controlled to rectify the AC power of the grid and output DC power to the energy storage module to charge the energy storage module. Wherein, the preset overcharge threshold is greater than the preset over-discharge threshold.

2. The energy storage system as described in claim 1, characterized in that, The energy storage system also includes: A DC-DC converter module is provided, wherein a first terminal of the DC-DC converter module is connected to the energy storage module and a second terminal of the AC-DC converter module, the second terminal of the DC-DC converter module is connected to the first terminal of the first switching assembly, and the controlled terminal of the DC-DC converter module is electrically connected to the main control module. The DC-DC converter module is used to convert the voltage of the energy storage module and output a voltage identical to that of the DC bus to the DC bus; it is also used to convert the voltage of the DC bus and output a voltage identical to that of the energy storage module to the energy storage module.

3. The energy storage system as described in claim 1, characterized in that, The energy storage system also includes: A unidirectional conduction circuit is provided, wherein the first terminals of the energy storage module and the first switching assembly are both electrically connected to the output terminal of the unidirectional conduction circuit, and the input terminal of the unidirectional conduction circuit is used to connect to the DC bus.

4. The energy storage system as described in claim 1, characterized in that, The energy storage system also includes multiple second switching components. The first end of each of the multiple second switching components is electrically connected to the second end of the first switching component. The second end of each of the multiple second switching components is electrically connected to a plurality of DC buses in a one-to-one correspondence. The controlled end of the second switching component is electrically connected to the main control module.

5. A control method for an energy storage system, characterized in that, The control method, applied to the energy storage system as described in any one of claims 1 to 4, comprises: Obtain the voltage of the energy storage module; If the voltage of the energy storage module is greater than the preset overcharge threshold, the AC-DC conversion module is controlled to invert the DC power output by the energy storage module and output it to the grid until the voltage of the energy storage module is no greater than the preset overcharge threshold. And / or, control the first switching component to turn on, so that the energy storage module discharges to the DC bus until the voltage of the energy storage module is not greater than a preset overcharge threshold; When the voltage of the energy storage module is less than a preset over-discharge threshold, the total regenerated power and total power consumption of multiple devices are obtained, and the total regenerated power and total power consumption are compared. When the total regenerated power is greater than the total power consumption, the first switching component is controlled to be turned on so that the DC bus charges the energy storage module; When the total regenerated power is not greater than the total power consumption, the power conversion function of the AC-DC converter is obtained, and when the AC-DC converter can perform the rectification function, the first switch component is controlled to turn off, and the AC-DC converter is controlled to rectify the AC power of the grid and output DC power to the energy storage module to charge the energy storage module.

6. The control method for the energy storage system as described in claim 5, characterized in that, The step of controlling the AC / DC converter to invert the DC power output from the energy storage module and output it to the power grid when the voltage of the energy storage module is greater than a preset overcharge threshold, until the voltage of the energy storage module is not greater than the preset overcharge threshold; and / or controlling the first switching component to conduct so that the energy storage module discharges to the DC bus until the voltage of the energy storage module is not greater than the preset overcharge threshold includes: Obtain the power conversion function of the AC / DC converter module; When the AC / DC conversion module is capable of performing the inverter function, the first switching component is controlled to turn off, and the AC / DC conversion module is controlled to invert the DC power output by the energy storage module according to the rated power and output it to the grid until the voltage of the energy storage module is not greater than the preset overcharge threshold. When the AC / DC conversion module is unable to perform the inverter function, the control equipment scheduling center prioritizes the operation of equipment with motor power greater than the preset power to consume electricity, so that the total power consumption of multiple devices is greater than the total regenerated power of multiple devices, and controls the first switching component to conduct, so that the energy storage module discharges to the DC bus until the voltage of the energy storage module is not greater than the preset overcharge threshold.

7. The control method for the energy storage system as described in claim 5, characterized in that, The step of acquiring the power conversion function of the AC / DC converter module when the total regenerated power is not greater than the total power consumption, and controlling the first switching component to turn off when the AC / DC converter module can perform rectification function, and controlling the AC / DC converter module to rectify the AC power from the grid and output DC power to the energy storage module to charge the energy storage module includes: In the case where the energy storage system includes a unidirectional conduction circuit, the first switching component is controlled to turn off so that the DC bus charges the energy storage module; In the absence of a unidirectional conduction circuit in the energy storage system, the first switching component is controlled to turn off, and the power conversion function of the AC / DC conversion module is obtained. When the AC / DC conversion module is capable of performing rectification, the AC / DC conversion module is controlled to rectify the AC power of the power grid according to the first preset power and output DC power to the energy storage module to charge the energy storage module until the voltage of the energy storage module is not less than the preset over-discharge threshold. If the AC / DC conversion module is unable to perform rectification, the energy storage system is controlled to enter a sleep mode. The first terminals of the energy storage module and the first switch assembly are both electrically connected to the output terminal of the unidirectional conduction circuit, and the input terminal of the unidirectional conduction circuit is used to connect to the DC bus.

8. The control method for the energy storage system as described in any one of claims 5 to 7, characterized in that, After obtaining the voltage of the energy storage module, the process further includes: When the voltage of the energy storage module is not greater than a preset overcharge threshold and not less than a preset over-discharge threshold, the actual electricity price for the current time period is obtained, and the actual electricity price is compared with the preset electricity price. When the actual electricity price is greater than the preset electricity price, the power conversion function of the AC / DC conversion module is obtained, and when the AC / DC conversion module has an inverter function, the AC / DC conversion module is controlled to invert the DC power output by the energy storage module and output it to the power grid. When the actual electricity price is not greater than the preset electricity price, the power conversion function of the AC / DC conversion module is obtained, and when the AC / DC conversion module has a rectification function, the AC / DC conversion module is controlled to charge the energy storage module.

9. The control method for the energy storage system as described in claim 8, characterized in that, The step of acquiring the power conversion function of the AC / DC converter module when the actual electricity price is greater than the preset electricity price, and controlling the AC / DC converter module to invert the DC power output from the energy storage module and output it to the power grid when the AC / DC converter module has an inverter function, includes: Obtain the total regeneration power and total power consumption of multiple devices, and compare the total regeneration power and the total power consumption; When the total regenerated power is greater than the total power consumption, the power conversion function of the AC / DC converter is activated. If the AC / DC converter has an inverter function, the first switching component is turned on, and the AC / DC converter is controlled to continuously invert the DC power output from the energy storage module and the DC power on the DC bus and output them to the grid according to a second preset power for a first preset duration. The first preset duration includes the duration during which the total regenerated power is greater than the total power consumption. If the total regenerated power is not greater than the total power consumption, the discharge capacity of the energy storage module is obtained, and the discharge capacity is compared with the difference between the total regenerated power and the total power consumption. When the dischargeable amount is greater than the difference between the total regenerated power and the total power consumption, the first switching component is controlled to turn on so that the energy storage module discharges to the DC bus. The power conversion function of the AC / DC converter module is also acquired. When the AC / DC converter module is able to perform the inverter function, the AC / DC converter module is controlled to continuously invert the DC power output by the energy storage module and output it to the grid according to a third preset power for a second preset duration. The second preset duration includes the duration during which the total regenerated power is not greater than the total power consumption.

10. The control method for the energy storage system as described in claim 8, characterized in that, The step of acquiring the power conversion function of the AC / DC converter module when the actual electricity price is not greater than the preset electricity price, and controlling the AC / DC converter module to charge the energy storage module when the AC / DC converter module has a rectification function, includes: Obtain the total regeneration power and total power consumption of multiple devices, and compare the total regeneration power and the total power consumption; If the total regenerated power is greater than the total power consumption, the rechargeable amount of the energy storage module is obtained, and the rechargeable amount is compared with the difference between the total regenerated power and the total power consumption. When the rechargeable amount is greater than the difference between the total regenerated power and the total power consumption, the first switching component is controlled to be turned on so that the DC bus charges the energy storage module. The power conversion function of the AC / DC converter module is also acquired. If the AC / DC converter module has a rectification function, the AC / DC converter module is controlled to continuously charge the energy storage module according to a fourth preset power for a third preset duration. The third preset duration includes the duration during which the total regenerated power is greater than the total power consumption. If the rechargeable amount is not greater than the difference between the total regenerated power and the total power consumption, the first switching component is controlled to be turned on so that the DC bus charges the energy storage module. When the total regenerated power is not greater than the total power consumption, the power conversion function of the AC / DC conversion module is obtained, and when the AC / DC conversion module has a rectification function, the first switching component is controlled to turn off, and the AC / DC conversion module is controlled to continuously charge the energy storage module according to the fifth preset power for the fourth preset duration.

11. The control method for the energy storage system according to any one of claims 5 to 7, characterized in that, The control method further includes: The operating status of the energy storage module is obtained, and when the energy storage module is in a static state, the voltage of multiple batteries in the energy storage module is obtained, and the first battery with the highest voltage is selected. Calculate the average voltage of the multiple batteries and control the passive resistor in the first battery to consume power until the difference between the voltage of the first battery and the average voltage is less than a preset difference.

12. The control method for the energy storage system as described in claim 5, characterized in that, The DC bus is connected to the power grid via a third switching assembly. The energy storage system also includes multiple second switching assemblies. The control method further includes: Obtain the switching states of multiple third switch components; When any of the third switch components is in the open state, the second switch component connected to the same DC bus as the third switch component is controlled to open. Alternatively, electrical energy can be obtained from multiple of the third switching components; When the electrical energy on any of the third switching components is zero, the second switching component connected to the same DC bus as the third switching component is disconnected.

13. The control method for the energy storage system as described in claim 12, characterized in that, The control method further includes: The electrical energy at the first terminal of the AC / DC conversion module is obtained, and the electrical energy at multiple third switching components is also obtained. When the electrical energy at the first terminal of the AC / DC conversion module is zero and all the second switching components are disconnected, the energy storage system is controlled to enter a sleep mode. When the electrical energy at the first terminal of the AC / DC conversion module or the electrical energy at any of the third switching components is not less than the preset electrical energy, the energy storage system is controlled to exit the hibernation mode and enter the operation mode.

14. The control method for the energy storage system as described in claim 5, characterized in that, The control method further includes: If the energy storage system is in hibernation mode and the voltage of the energy storage module is less than a preset low threshold, a shutdown warning is sent and the energy storage system is controlled to enter shutdown mode.

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