Container energy storage system and control method and control device thereof

Abstract

The invention discloses a container energy storage system and a control method and a control device.The container energy storage system comprises a first electric energy conversion unit and a UPS battery unit, and the first electric energy conversion unit is suitable for being connected with a power generation unit and converting electric energy output by the power generation unit; the method is used for supplying power to a UPS battery unit and a target direct current load in the container energy storage system, and comprises the following steps: determining a working mode of the UPS battery unit; and controlling the first electric energy conversion unit and the UPS battery unit according to the working mode of the UPS battery unit and the electric quantity of the UPS battery unit. According to the control method, in the process that the power generation unit supplies power to the target direct current load and the UPS battery unit, the floating charge state of the UPS battery unit is reduced or eliminated, the service life of the UPS battery unit is prolonged, the UPS battery unit is verified, and the precision of the voltage detection value of the UPS battery unit is improved.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a container energy storage system and a control method and a control device thereof. Background Art

[0002] At present, the combination of containers and new energy sources as energy storage systems has been widely used, for example, the combination of containers and solar energy. However, in some related control schemes, UPS batteries are often in a fully charged floating charge state, resulting in a reduction in the service life of the UPS (Uninterrupt ib le Power Supply) battery. The sampling accuracy of its power is low, and the battery voltage cannot be accurately known.

[0003] The above statements are only used to provide background information related to the present application and do not necessarily constitute prior art. Summary of the invention

[0004] In view of the above problems, the present application provides a container energy storage system and its power distribution device and power distribution method, wherein the first power conversion unit converts the power output by the power generation unit to supply power to the UPS battery unit and the target DC load in the container energy storage system, and in the process of the power generation unit supplying power to the target DC load and the UPS battery unit, the first power conversion unit and the UPS battery unit are controlled according to the working mode of the UPS battery unit and the power of the UPS battery unit. Thus, the floating charge state of the UPS battery unit can be reduced or eliminated, the service life of the UPS battery unit can be increased, and the UPS battery unit can be calibrated to improve the accuracy of the voltage detection value of the UPS battery unit.

[0005] In a first aspect, the present application provides a control method for a container energy storage system, wherein the container energy storage system comprises a first power conversion unit and a UPS battery unit, wherein the first power conversion unit is suitable for connecting to a power generation unit and converting the power output by the power generation unit to power the UPS battery unit and a target DC load in the container energy storage system, wherein the method comprises: determining an operating mode of the UPS battery unit; and controlling the first power conversion unit and the UPS battery unit according to the operating mode of the UPS battery unit and the power level of the UPS battery unit.

[0006] In the technical solution of the embodiment of the present application, the power generation unit determines the working mode of the UPS battery unit and obtains the power of the UPS battery unit in the process of supplying power to the UPS battery unit and the target DC load, and controls the first power conversion unit and the UPS battery unit according to the working mode of the UPS battery unit and the power of the UPS battery unit. For example, when the working mode of the UPS battery unit is the anti-floating charge mode, the discharge state of the UPS battery unit is controlled according to the power of the UPS battery unit to reduce or eliminate the floating charge state of the UPS battery unit and improve the service life of the UPS battery unit. For another example, when the working mode of the UPS battery unit is the calibration mode, the first power conversion unit and the UPS battery unit are controlled according to the power of the UPS battery unit to calibrate the UPS battery unit, improve the accuracy of the voltage detection value of the UPS battery unit, and improve the service life of the battery.

[0007] In some embodiments, determining the operating mode of the UPS battery unit includes: obtaining a verification cycle of the UPS battery unit; when the verification cycle of the UPS battery unit is reached, determining that the operating mode of the UPS battery unit is a first operating mode; when the verification cycle of the UPS battery unit is not reached, if the power of the UPS battery unit reaches a first preset power threshold, determining that the operating mode of the UPS battery unit is a second operating mode.

[0008] When the calibration cycle is reached, the UPS battery unit enters the calibration mode to calibrate the UPS battery unit and improve the voltage detection accuracy. When the calibration cycle is not reached, if the UPS battery unit is fully charged, the UPS battery unit enters the anti-floating charge mode to control the discharge of the UPS battery unit to reduce or eliminate floating charge and increase the battery life.

[0009] In some embodiments, the controlling of the first power conversion unit and the UPS battery unit according to the working mode of the UPS battery unit and the power level of the UPS battery unit includes: when the working mode of the UPS battery unit is the first working mode, if the power level of the UPS battery unit meets the required power of the target DC load, controlling the UPS battery unit to supply power to the target DC load until the power level of the UPS battery unit is reduced to a second preset power threshold; wherein the first preset power threshold is greater than the second preset power threshold.

[0010] When entering the calibration mode, if the power of the UPS battery unit can meet the required power of the target DC load, the UPS battery unit is controlled to discharge until it is reduced to zero, so that the UPS battery unit is fully discharged.

[0011] In some embodiments, the controlling of the first power conversion unit and the UPS battery unit according to the working mode of the UPS battery unit and the power level of the UPS battery unit also includes: when the power level of the UPS battery unit is reduced to a second preset power threshold, controlling the first power conversion unit to output a first direct current to charge the UPS battery unit.

[0012] After the UPS battery unit is fully discharged, the first power conversion unit is controlled to output the first DC power to supply power to the target DC load. During the process of supplying power to the target DC load, since the UPS battery power supply and the target DC load are on the same branch, the first DC power output by the first power conversion unit will synchronously charge the UPS battery unit. After the UPS battery unit is fully charged, the UPS battery unit is calibrated according to the discharged power and the charged power, so as to improve the voltage detection accuracy of the UPS battery unit and increase the service life of the battery.

[0013] In some embodiments, the controlling of the first power conversion unit and the UPS battery unit according to the working mode of the UPS battery unit and the power level of the UPS battery unit includes: when the power level of the UPS battery unit does not meet the required power of the target DC load, controlling the first power conversion unit to output the first direct current to power the UPS battery unit and the target DC load.

[0014] When the UPS battery unit does not meet the required power of the target DC load, the UPS battery unit is first charged, and then the target DC load is powered by the UPS battery unit, and the UPS battery unit is checked according to the charging amount and the discharging amount.

[0015] In some embodiments, the controlling of the first power conversion unit and the UPS battery unit according to the working mode of the UPS battery unit and the power level of the UPS battery unit includes: when the working mode of the UPS battery unit is the second working mode, controlling the UPS battery unit to supply power to the target DC load until the power level of the UPS battery unit is reduced to a third preset power threshold; wherein the first preset power threshold is greater than the third preset power threshold.

[0016] When the UPS battery unit enters the anti-floating charge mode, the UPS battery unit is controlled to supply power to the target DC load to reduce the power of the UPS battery unit, thereby reducing or eliminating the floating charge of the UPS battery unit in the process of the power generation unit supplying power to the target DC load and the UPS battery unit, thereby increasing the service life of the UPS battery unit.

[0017] In some embodiments, the first power conversion unit includes a first DC / DC converter, and the first DC / DC converter is suitable for converting the direct current output by the power generation unit to output a first direct current. The method also includes: when the power generation power of the power generation unit meets the required power of the target DC load, controlling the first DC / DC converter to output the first direct current to power the UPS battery unit and the target DC load.

[0018] When the power generation power of the power generation unit meets the required power of the target DC load, the power generation unit supplies power to the target DC load. Since the power output by the power generation unit cannot directly meet the power supply voltage of the target DC load, it is necessary to convert the DC power output by the power generation unit through the first DC / DC converter to output the first DC power to supply power to the UPS battery unit and the target DC load, thereby reducing energy loss, improving energy utilization, and reducing the power consumption of the auxiliary power supply. In addition, in the absence of an auxiliary power supply, the black start of the container energy storage system can be achieved.

[0019] In some embodiments, the first power conversion unit further includes a first DC / AC converter, and the first DC / AC converter is suitable for converting the second direct current output by the first DC / DC converter to output a first alternating current. The method further includes: when the power generation power of the power generation unit meets the sum of the required power of the target DC load and the required power of the AC load, controlling the first DC / AC converter to output the first alternating current to power the AC load.

[0020] When the power generation of the power generation unit can simultaneously meet the power requirements of the target DC load and the AC load, the power generation unit can also power the AC load while supplying power to the target DC load. Since the power output by the power generation unit cannot directly meet the power supply voltage of the AC load, it is necessary to convert the second DC power output by the first DC / DC converter through the first DC / DC converter to output the first AC power to supply power to the AC load, thereby maximizing the utilization rate of the power output by the power generation unit, reducing the abandoned light, and reducing the energy consumption of the auxiliary power supply.

[0021] In a second aspect, the present application provides a control device for a container energy storage system, wherein the container energy storage system includes a first power conversion unit and a UPS battery unit, wherein the first power conversion unit is suitable for connecting to a power generation unit and converting the power output by the power generation unit to power the UPS battery unit and the target DC load in the container energy storage system, wherein the device includes: a determination module for determining an operating mode of the UPS battery unit; an acquisition module for acquiring the power level of the UPS battery unit; and a control module for controlling the first power conversion unit and the UPS battery unit according to the operating mode of the UPS battery unit and the power level of the UPS battery unit.

[0022] In the technical solution of the embodiment of the present application, in the process of supplying power to the UPS battery unit and the target DC load, the power generation unit determines the working mode of the UPS battery unit through the determination module, and obtains the power of the UPS battery unit through the acquisition module, and the control module controls the first power conversion unit and the UPS battery unit according to the working mode of the UPS battery unit and the power of the UPS battery unit. For example, when the working mode of the UPS battery unit is determined to be the anti-floating charge mode by the determination module, the control module controls the discharge state of the UPS battery unit according to the power of the UPS battery unit to reduce or eliminate the floating charge state of the UPS battery unit and improve the service life of the UPS battery unit. For another example, when the working mode of the UPS battery unit is determined to be the calibration mode by the determination module, the control module controls the first power conversion unit and the UPS battery unit according to the power of the UPS battery unit to calibrate the UPS battery unit, improve the accuracy of the voltage detection value of the UPS battery unit, and improve the service life of the battery.

[0023] In some embodiments, the determination module determines the operating mode of the UPS battery unit, and is specifically used to: obtain a verification period of the UPS battery unit; when the verification period of the UPS battery unit is reached, determine that the operating mode of the UPS battery unit is a first operating mode; when the verification period of the UPS battery unit is not reached, if the power level of the UPS battery unit reaches a first preset power threshold, determine that the operating mode of the UPS battery unit is a second operating mode.

[0024] When the verification cycle is reached, the determination module determines that the UPS battery unit enters the verification mode to calibrate the UPS battery unit and improve the voltage detection accuracy. Before the verification cycle is reached, if the UPS battery unit is fully charged, the determination module determines that the UPS battery unit enters the anti-floating charge mode, and the control module controls the UPS battery unit to discharge to reduce or eliminate floating charge and increase the battery life.

[0025] In some embodiments, the control module controls the first power conversion unit and the UPS battery unit according to the working mode of the UPS battery unit and the power level of the UPS battery unit, and is specifically used to: when the working mode of the UPS battery unit is the first working mode, if the power level of the UPS battery unit meets the required power of the target DC load, control the UPS battery unit to supply power to the target DC load until the power level of the UPS battery unit is reduced to a second preset power threshold; wherein the first preset power threshold is greater than the second preset power threshold.

[0026] When entering the calibration mode, if the power of the UPS battery unit can meet the required power of the target DC load, the control module controls the UPS battery unit to discharge until it is reduced to zero, so that the UPS battery unit is fully discharged.

[0027] In some embodiments, the control module is further used to control the first power conversion unit to output a first direct current to charge the UPS battery unit when the power level of the UPS battery unit drops to a second preset power threshold.

[0028] After the UPS battery unit is fully discharged, the control module controls the first power conversion unit to output the first DC power to power the target DC load. During the process of powering the target DC load, since the UPS battery power supply and the target DC load are on the same branch, the first DC power output by the first power conversion unit will synchronously charge the UPS battery unit. After the UPS battery unit is fully charged, the control module checks the UPS battery unit according to the discharged power and the charged power, thereby improving the voltage detection accuracy of the UPS battery unit and increasing the battery life.

[0029] In some embodiments, the control module is also used to control the first power conversion unit to output a first direct current to power the UPS battery unit and the target DC load when the power of the UPS battery unit does not meet the required power of the target DC load.

[0030] When the power of the UPS battery unit does not meet the required power of the target DC load, the control module first controls the first power conversion unit to output power to charge the UPS battery unit, and then controls the UPS battery unit to supply power to the target DC load, and checks the UPS battery unit according to the charging and discharging amounts.

[0031] In some embodiments, the control module controls the first power conversion unit and the UPS battery unit according to the working mode of the UPS battery unit and the power level of the UPS battery unit, and is specifically used to: when the working mode of the UPS battery unit is the second working mode, control the UPS battery unit to supply power to the target DC load until the power level of the UPS battery unit is reduced to a third preset power threshold; wherein the first preset power threshold is greater than the third preset power threshold.

[0032] When the determination module determines that the UPS battery unit enters the anti-floating charge mode, the control module controls the UPS battery unit to supply power to the target DC load to reduce the power of the UPS battery unit, thereby reducing or eliminating the floating charge of the UPS battery unit in the process of the power generation unit supplying power to the target DC load and the UPS battery unit, thereby increasing the service life of the UPS battery unit.

[0033] In a third aspect, an embodiment of the present application provides a container energy storage system, including a power generation unit, a first power conversion unit, a UPS battery unit, and a control device of the above-mentioned container energy storage system.

[0034] In some embodiments, the power generation unit includes at least one of a photovoltaic power generation component and a wind power generation component.

[0035] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0037] Figure 1 is a flow chart of a control method of a container energy storage system according to some embodiments;

[0038] Figure 2 is a schematic diagram of a container energy storage system according to some embodiments;

[0039] Figure 3 is a schematic diagram of the position of photovoltaic components according to some embodiments;

[0040] Figure 4 is a flow chart of a control method of a container energy storage system according to some embodiments;

[0041] Figure 5 is a block diagram of a control device of a container energy storage system according to some embodiments;

[0042] Figure 6 is a block diagram of a container energy storage system according to some embodiments. DETAILED DESCRIPTION

[0043] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0045] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0046] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0047] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0048] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0049] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0050] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0051] In order to make the container energy storage system operate normally, the control system, battery management system, fire protection system and other electrical equipment are configured in the container energy storage system, so the container needs to be equipped with an auxiliary power supply for power distribution. Usually, the power supply of the entire energy storage system is taken from the power grid, and the external energy is not fully utilized. Therefore, when the container energy storage system uses external energy to power the load, it is necessary to consider the reasonable allocation of energy required for powering each load (low-voltage load and high-voltage load), and maximize the use of external energy (such as solar energy, wind energy, etc.) to reduce the power consumption of the mains while enabling the load to work normally.

[0052] In the embodiment of the present application, the electric energy generated by the external energy is used to power the low-voltage load in the container energy storage system, and the UPS battery unit and the low-voltage load are on the same branch line, that is, when the low-voltage load is powered by the external power supply, the UPS battery unit will also be charged to improve energy utilization and reduce system power consumption. When the city power is cut off, the UPS battery unit supplies power to the low-voltage load, or realizes a black start, so it is necessary to control the switch tube corresponding to the UPS battery unit to be in a normally closed state so that the UPS battery is always in a fully charged state, which will cause the UPS battery unit to often be in a fully charged floating charge state, resulting in a reduction in the service life of the UPS battery unit, and the power state of the UPS battery unit is determined based on the voltage collected by the sampling chip, and the sampling accuracy is low.

[0053] Therefore, in the embodiment of the present application, the first power conversion unit converts the power output by the power generation unit to supply power to the UPS battery unit and the target DC load in the container energy storage system. In the process of the power generation unit supplying power to the target DC load and the UPS battery unit, the working mode of the UPS battery unit is determined; the first power conversion unit and the UPS battery unit are controlled according to the working mode of the UPS battery unit and the power of the UPS battery unit. In this way, the floating charge state of the UPS battery unit can be reduced or eliminated, the service life of the UPS battery unit can be increased, and the UPS battery unit can be verified to improve the accuracy of the voltage detection value of the UPS battery unit.

[0054] For the convenience of explanation, the following embodiments are combined Figure 1 A control method for a container energy storage system according to an embodiment of the present application is described.

[0055] Reference Figure 2 In the present application, the container energy storage system may include: a power generation unit 10, a first power conversion unit 20, a UPS battery unit 30 and a high-voltage battery 40. The first power conversion unit 20 is suitable for connecting to the power generation unit 10 and converting the power output by the power generation unit 10 to supply power to the UPS battery unit 30 and the target DC load in the container energy storage system. The power generation unit 10 may include at least one of a photovoltaic component and a wind component.

[0056] When the power generation of the power generation unit 10 can meet the power demand of the target DC load, the first power conversion unit 20 is controlled to convert the power output of the power generation unit 10 to supply power to the UPS battery unit 30 and the target DC load. The power generated by the power generation unit does not need to be incorporated into the power grid, which reduces energy loss, improves energy utilization, and reduces the power consumption of the auxiliary power supply. When the power generation of the power generation unit 10 cannot meet the power demand of the target DC load, the first power conversion unit 20 is controlled to convert the power output of the power generation unit 10 to charge the high-voltage battery 40 to reduce abandoned light and improve energy utilization.

[0057] like Figure 1 As shown, the control method of the container energy storage system in the embodiment of the present application may include:

[0058] S1, determine the working mode of the UPS battery unit.

[0059] S2, controlling the first power conversion unit and the UPS battery unit according to the working mode of the UPS battery unit and the power level of the UPS battery unit.

[0060] Specifically, in the process of supplying power to the UPS battery unit and the target DC load, the power generation unit determines the working mode of the UPS battery unit and obtains the power of the UPS battery unit, and controls the first power conversion unit and the UPS battery unit according to the working mode of the UPS battery unit and the power of the UPS battery unit. For example, when the working mode of the UPS battery unit is the anti-floating charge mode, the discharge state of the UPS battery unit is controlled according to the power of the UPS battery unit to reduce or eliminate the floating charge state of the UPS battery unit and improve the service life of the UPS battery unit. For another example, when the working mode of the UPS battery unit is the calibration mode, the first power conversion unit and the UPS battery unit are controlled according to the power of the UPS battery unit to fully charge and discharge the UPS battery unit, realize the calibration of the UPS battery unit, improve the accuracy of the voltage detection value of the UPS battery unit, and improve the service life of the battery.

[0061] In some embodiments, determining the working mode of the UPS battery unit includes: obtaining a verification cycle of the UPS battery unit; determining that the working mode of the UPS battery unit is a first working mode when the verification cycle of the UPS battery unit is reached; and determining that the working mode of the UPS battery unit is a second working mode when the verification cycle of the UPS battery unit is not reached and the power of the UPS battery unit reaches a first preset power threshold. The first preset power threshold can be calibrated according to actual conditions, for example, the first preset power threshold can be 100%.

[0062] Specifically, the calibration cycle of the UPS battery unit can be pre-set according to the actual working conditions. For example, the calibration cycle is one month, that is, calibration is performed once a month. When the calibration cycle is reached, the working mode of the UPS battery unit is determined to be the first working mode, that is, the UPS battery unit enters the calibration mode. In the first working mode, the UPS battery unit is calibrated to improve the voltage detection accuracy. Before the calibration cycle is reached, if the UPS battery unit is fully charged (100%), the working mode of the UPS battery unit is determined to be the second working mode, that is, the UPS battery unit enters the anti-floating charge mode. In the second working mode, the UPS battery unit is controlled to discharge and supply power to the target DC load to reduce or eliminate floating charge and increase the battery life.

[0063] In some embodiments, the first power conversion unit and the UPS battery unit are controlled according to the working mode of the UPS battery unit and the power of the UPS battery unit, including: when the working mode of the UPS battery unit is the first working mode, if the power of the UPS battery unit meets the required power of the target DC load, the UPS battery unit is controlled to supply power to the target DC load until the power of the UPS battery unit is reduced to a second preset power threshold; wherein the first preset power threshold is greater than the second preset power threshold. The second preset power threshold can be calibrated according to actual conditions, for example, the second preset power threshold is 0.

[0064] That is to say, when the UPS battery unit is in the first working mode, that is, it enters the calibration mode, and first determines whether the UPS battery unit is fully charged or fully discharged based on the power level of the UPS battery unit. If the power level of the UPS battery unit can meet the required power of the target DC load, the UPS battery unit is controlled to discharge until it is reduced to zero, so that the UPS battery unit is fully discharged, so as to facilitate the subsequent calibration of the SOC (State of Charge) and SOH (State of health) of the UPS battery unit according to the full discharge amount and the full charge amount.

[0065] In some embodiments, the first power conversion unit and the UPS battery unit are controlled according to the working mode of the UPS battery unit and the power level of the UPS battery unit, and also includes: when the power level of the UPS battery unit is reduced to a second preset power threshold, controlling the first power conversion unit to output a first direct current to charge the UPS battery unit.

[0066] Specifically, after the UPS battery unit is fully discharged, that is, the power level is reduced to 0, the first power conversion unit is controlled to output the first DC power to supply power to the target DC load. In the process of supplying power to the target DC load, since the UPS battery power supply and the target DC load are on the same branch, the first DC power output by the first power conversion unit will synchronously charge the UPS battery unit. After the UPS battery unit is fully charged, the UPS battery unit is calibrated according to the discharged power and the charged power to improve the voltage detection accuracy of the UPS battery unit and increase the battery life.

[0067] In some embodiments, the first power conversion unit and the UPS battery unit are controlled according to the working mode of the UPS battery unit and the power level of the UPS battery unit, including: when the power level of the UPS battery unit does not meet the required power of the target DC load, controlling the first power conversion unit to output the first DC power to power the UPS battery unit and the target DC load.

[0068] Specifically, when the UPS battery unit is in the first working mode, that is, it enters the calibration mode. If the power of the UPS battery unit cannot meet the required power of the target DC load, the first power conversion unit is controlled to output the first DC power to charge the UPS battery unit first and supply power to the target DC load at the same time. After the UPS battery unit is fully charged, the target DC load is supplied with power through the UPS battery unit so that the UPS battery unit can be calibrated according to the charging and discharging amounts.

[0069] In some embodiments, the first power conversion unit and the UPS battery unit are controlled according to the working mode of the UPS battery unit and the power level of the UPS battery unit, including: when the working mode of the UPS battery unit is the second working mode, controlling the UPS battery unit to supply power to the target DC load until the power level of the UPS battery unit is reduced to a third preset power threshold; wherein the first preset power threshold is greater than the third preset power threshold, and the third preset power threshold can be calibrated according to actual conditions, for example, the third preset power threshold is 80%.

[0070] Specifically, when the UPS battery unit is in the second working mode, that is, it enters the anti-floating charge mode, controls the UPS battery unit to supply power to the target DC load to reduce the power of the UPS battery unit until the power of the UPS battery unit is reduced to 80%, and stops supplying power to the target DC load. Thus, in the process of the power generation unit supplying power to the target DC load and the UPS battery unit, the floating charge of the UPS battery unit is reduced or eliminated, and the service life of the UPS battery unit is increased.

[0071] In some embodiments, Figure 2 As shown, the first power conversion unit 20 may include a first DC / DC converter 21, which is suitable for converting the direct current output by the power generation unit 10 to output a first direct current. The method also includes: when the power generation power of the power generation unit meets the required power of the target DC load, controlling the first DC / DC converter to output the first direct current to power the UPS battery unit and the target DC load.

[0072] Specifically, the power generation unit may include at least one of a photovoltaic module and a wind power module. Due to the instability and volatility of the power generation unit, taking the photovoltaic module as an example, when the external environment light and temperature are not good, the power generation power of the photovoltaic module may not meet the demand of the target DC load. In order to enable the electrical equipment in the container energy storage system to operate normally, it is necessary to collect the power generation power of the photovoltaic module and the required power of the target DC load in real time. When the power generation power of the power generation unit meets the required power of the target DC load, the target DC load is powered by the power generation unit. Since the power output by the power generation unit cannot directly meet the power supply voltage of the target DC load, it is necessary to convert the DC power output by the power generation unit through the first DC / DC converter to output the first DC power to power the UPS battery unit and the target DC load, thereby reducing energy loss, improving energy utilization, and reducing the power consumption of the auxiliary power supply. In addition, in the absence of an auxiliary power supply, the black start of the container energy storage system can also be achieved.

[0073] In some embodiments, Figure 2 As shown, the first power conversion unit 20 may further include a first DC / AC converter 22, and the first DC / AC converter 22 is suitable for converting the second direct current output by the first DC / DC converter 21 to output a first alternating current. The method also includes: when the power generation power of the power generation unit meets the sum of the required power of the target DC load and the required power of the AC load, controlling the first DC / AC converter to output the first alternating current to power the AC load.

[0074] Specifically, when the power generation of the power generation unit can simultaneously meet the power requirements of the target DC load and the AC load, the power generation unit can also power the AC load while supplying power to the target DC load. Since the power output by the power generation unit cannot directly meet the power supply voltage of the AC load, it is necessary to convert the second DC power output by the first DC / DC converter through the first DC / DC converter to output the first AC power to supply power to the AC load, thereby maximizing the utilization rate of the power output by the power generation unit, reducing the abandoned light, and reducing the energy consumption of the auxiliary power supply.

[0075] It should be noted that the first DC / DC converter includes multiple DC / DC sub-modules, which are used to convert the electric energy output by the power generation unit into direct current with different voltage values ​​to meet the power supply voltage of the corresponding module. For example, the target DC load is a low-voltage DC load, and the required power supply voltage is about 12V / 24V. For example, the power supply voltage of the AC load of the container energy storage system is generally around 220V.

[0076] Continue to refer to Figure 2When the power generation of the power generation unit cannot meet the power demand of the AC load, the auxiliary power supply (mains power) supplies power to the AC load so that the electrical equipment in the container energy storage system can work normally. In addition, when the power generation of the power generation unit cannot meet the power demand of the target DC load, the auxiliary power supply provides power. Since the auxiliary power supply is AC, it is necessary to use an AC / DC converter to convert the AC power of the auxiliary power supply into DC power to supply power to the target DC load.

[0077] It should be noted that the above-mentioned control method can be integrated into the control unit of the container energy storage system, and the control unit controls the first power conversion unit according to the power generation power of the power generation unit and the required power of the target DC load, and the control unit determines the working mode of the UPS battery unit, etc.

[0078] In some embodiments, in order to reasonably distribute the electric energy generated by the power generation unit, the various controllers in the container energy storage system (including the controller of the first DC / DC converter, the controller of the first DC / AC converter, etc.) can be integrated into an energy storage domain controller (the control unit of the container energy storage system) to form a smart energy management system, which can perform intelligent adjustments to the power generation unit, battery energy storage unit and load conditions. Such an energy storage domain controller architecture reduces the complexity of the energy storage system controller and communication delay, and reduces the system failure rate.

[0079] As a specific example, the power generation unit includes a photovoltaic module. In a conventional photovoltaic energy storage power station, the photovoltaic modules and the container energy storage system are placed separately in different areas, which occupies a huge area. In order to solve the problem of large floor space, the present application integrates the photovoltaic modules and the energy storage container into a physical setting, and prevents the photovoltaic modules from being placed on the top of the container through a bracket, such as Figure 3 As shown, the space of the energy storage container can be well utilized, effectively saving the floor space of the container energy storage system. The photovoltaic module is a sloped design structure, which can reduce the risk of water and snow accumulation on the top. Placing photovoltaic modules on the energy storage container can not only reduce the usage of the occupied area, but also the top of the energy storage container is affected by solar radiation. Due to the difference in the three-dimensional temperature field, the temperature on the top is on average about 2°C higher than the temperature of other parts. After placing the photovoltaic circuit board on the top, it can absorb the heat from the solar radiation, avoid direct sunlight to the container battery system, reduce the heat infiltration from the outside of the container, reduce the temperature of the battery cells in the container, reduce the energy consumption of the battery temperature management system, and increase the service life of the battery system. In addition, the bracket of the photovoltaic module also has a retractable function. For example, when the light intensity is >1000W / m 2 , and the ambient temperature is >25℃, the photovoltaic modules on the top of the energy storage box can be spread out to increase the collection capacity of the photovoltaic modules and improve energy collection; when the light intensity is <1000W / m 2Or when the ambient temperature is less than 25℃, collect the sagging photovoltaic panels.

[0080] The photovoltaic module is used as the energy source of the target DC load. The electric energy generated by the photovoltaic module is converted by the first DC / DC converter to supply power to the target DC load. The electric energy generated by the photovoltaic module does not need to be incorporated into the power grid, but is directly used to supply power to the low-voltage auxiliary power supply of the container energy storage system, which can reduce energy loss and reduce the power consumption of the auxiliary power supply of the container energy storage system. In addition, in the absence of an auxiliary power supply, the black start of the container energy storage system can be achieved by generating electricity through the photovoltaic module.

[0081] The electric energy generated by the photovoltaic assembly can also be converted in two stages by the first DC / DC converter and the first DC / AC converter to power an AC load (AC load). The power generation power of the photovoltaic assembly and the required power of the AC load determine whether the AC load is powered by the AC power converted by the first DC / AC converter or by the AC power provided by the auxiliary power supply.

[0082] In some embodiments, the power distribution device of the container energy storage system is integrated in the container and pre-connected to the electrical equipment through a wiring harness. It is only necessary to reserve an interface for connection with the photovoltaic module, which can reduce external wiring harness connections and facilitate installation and debugging.

[0083] Photovoltaic power generation is unstable and volatile. When photovoltaic power generation is insufficient, the electrical equipment in the container still needs to operate normally. Therefore, a control unit needs to be set up in the system to collect the power generation of the photovoltaic components and the power demand of the electrical load in the container in real time. The control unit determines in real time whether the power generation of the photovoltaic components can meet the load demand. If it cannot be met, the power supply is supplemented by the municipal electricity so that the electrical equipment can operate normally in real time.

[0084] like Figure 4 As shown, the following control logic is applied in the control unit of the container energy storage system. The control method of the container energy storage system of the present application may include the following steps:

[0085] S101, the control unit performs a power-on self-test.

[0086] S102, determining whether the power generated by the photovoltaic module meets the power requirement of the DC load (target DC load). If yes, executing step S104; if no, executing step S103.

[0087] S103, the photovoltaic assembly charges the high-voltage battery through the first DC / DC converter.

[0088] S104, the photovoltaic assembly supplies power to the DC load via the first DC / DC converter.

[0089] S105, determine whether it has been more than one month since the last SOX state calibration of the UPS battery unit. If yes, execute step S106; if not, execute step S110.

[0090] Among them, the SOX status includes SOH, SOC, SOP and SOE. This application only verifies SOC and SOH.

[0091] S106, determining whether the power of the UPS battery unit meets the power requirement of the DC load. If yes, executing step S107; if no, executing step S108.

[0092] S107, control the UPS battery unit to supply power to the DC load until the power of the UPS battery unit is reduced to zero, and execute step S108.

[0093] S108, the photovoltaic assembly supplies power to the DC load through the first DC / DC converter, and simultaneously fully charges the UPS battery unit.

[0094] S109, verifying the SOC and SOH of the UPS battery unit according to the amount of electricity discharged and charged in the UPS battery unit, and executing step S114.

[0095] S110, UPS battery unit does not enter SOX calibration mode.

[0096] S111, determine whether the power level of the UPS battery unit is 100%. If yes, execute step S112; if not, execute step S114.

[0097] S112, the UPS battery unit enters the anti-floating charge mode.

[0098] S113, controlling the UPS battery unit to supply power to the DC load until the power of the UPS battery unit is reduced to 80%.

[0099] S114, end this round of logic.

[0100] In summary, in the technical solution of the embodiment of the present application, the power generation unit determines the working mode of the UPS battery unit and obtains the power of the UPS battery unit in the process of supplying power to the UPS battery unit and the target DC load, and controls the first power conversion unit and the UPS battery unit according to the working mode of the UPS battery unit and the power of the UPS battery unit. For example, when the working mode of the UPS battery unit is the anti-floating charge mode, the discharge state of the UPS battery unit is controlled according to the power of the UPS battery unit to reduce or eliminate the floating charge state of the UPS battery unit and improve the service life of the UPS battery unit. For another example, when the working mode of the UPS battery unit is the calibration mode, the first power conversion unit and the UPS battery unit are controlled according to the power of the UPS battery unit to calibrate the UPS battery unit, improve the accuracy of the voltage detection value of the UPS battery unit, and improve the service life of the battery.

[0101] Corresponding to the above embodiments, the present application also proposes a control device for a container energy storage system.

[0102] In some embodiments, the container energy storage system includes a first power conversion unit and a UPS battery unit. The first power conversion unit is suitable for connecting to a power generation unit and converting the electric energy output by the power generation unit to power the UPS battery unit and the target DC load in the container energy storage system.

[0103] like Figure 5 As shown, the control device of the container energy storage system of the present application may include: a determination module 110 , an acquisition module 120 and a control module 130 .

[0104] The determination module 110 is used to determine the working mode of the UPS battery unit. The acquisition module 120 is used to acquire the power of the UPS battery unit. The control module 130 is used to control the first power conversion unit and the UPS battery unit according to the working mode of the UPS battery unit and the power of the UPS battery unit.

[0105] In the technical solution of the embodiment of the present application, in the process of supplying power to the UPS battery unit and the target DC load, the power generation unit determines the working mode of the UPS battery unit through the determination module 110, and obtains the power of the UPS battery unit through the acquisition module 120, and the control module 130 controls the first power conversion unit and the UPS battery unit according to the working mode of the UPS battery unit and the power of the UPS battery unit. For example, when the working mode of the UPS battery unit is determined to be the anti-floating charge mode by the determination module 110, the control module 130 controls the discharge state of the UPS battery unit according to the power of the UPS battery unit to reduce or eliminate the floating charge state of the UPS battery unit and improve the service life of the UPS battery unit. For another example, when the working mode of the UPS battery unit is determined to be the calibration mode by the determination module 110, the control module 130 controls the first power conversion unit and the UPS battery unit according to the power of the UPS battery unit to calibrate the UPS battery unit, improve the accuracy of the voltage detection value of the UPS battery unit, and improve the service life of the battery.

[0106] In some embodiments, a determination module determines an operating mode of a UPS battery unit, specifically for: obtaining a verification cycle of the UPS battery unit; when the verification cycle of the UPS battery unit is reached, determining that the operating mode of the UPS battery unit is a first operating mode; when the verification cycle of the UPS battery unit is not reached, if the power level of the UPS battery unit reaches a first preset power threshold, determining that the operating mode of the UPS battery unit is a second operating mode.

[0107] Specifically, the calibration cycle of the UPS battery unit can be pre-set according to the actual working conditions. For example, the calibration cycle is one month, that is, calibration is performed once a month. When the calibration cycle is reached, the module 110 determines that the working mode of the UPS battery unit is the first working mode, that is, the UPS battery unit enters the calibration mode. In the first working mode, the UPS battery unit is calibrated to improve the voltage detection accuracy. Before the calibration cycle is reached, if the UPS battery unit is fully charged, the module 110 determines that the working mode of the UPS battery unit is the second working mode, that is, the UPS battery unit enters the anti-floating charge mode. In the second working mode, the control module 130 controls the UPS battery unit to discharge and supply power to the target DC load to reduce or eliminate floating charge and increase the battery life.

[0108] In some embodiments, the control module controls the first power conversion unit and the UPS battery unit according to the working mode of the UPS battery unit and the power of the UPS battery unit, and is specifically used to: when the working mode of the UPS battery unit is the first working mode, if the power of the UPS battery unit meets the required power of the target DC load, control the UPS battery unit to supply power to the target DC load until the power of the UPS battery unit is reduced to a second preset power threshold; wherein the first preset power threshold is greater than the second preset power threshold.

[0109] That is to say, when the UPS battery unit is in the first working mode, that is, entering the calibration mode, the control module 130 first determines whether to fully charge or fully discharge the UPS battery unit based on the power level of the UPS battery unit. If the power level of the UPS battery unit can meet the required power of the target DC load, the control module 130 controls the UPS battery unit to discharge until it is reduced to zero, so that the UPS battery unit is fully discharged.

[0110] In some embodiments, the control module is further used to control the first power conversion unit to output the first direct current to charge the UPS battery unit when the power level of the UPS battery unit is reduced to a second preset power threshold.

[0111] Specifically, after the UPS battery unit is fully discharged, that is, the power level is reduced to 0, the control module 130 controls the first power conversion unit to output the first DC power to power the target DC load. In the process of powering the target DC load, since the UPS battery power supply and the target DC load are on the same branch, the first DC power output by the first power conversion unit will synchronously charge the UPS battery unit. After the UPS battery unit is fully charged, the control module 130 verifies the UPS battery unit according to the discharged power and the charged power, thereby improving the voltage detection accuracy of the UPS battery unit and increasing the battery life.

[0112] In some embodiments, the control module is further used to control the first power conversion unit to output the first direct current to power the UPS battery unit and the target DC load when the power of the UPS battery unit does not meet the power requirement of the target DC load.

[0113] Specifically, when the UPS battery unit is in the first working mode, that is, entering the calibration mode, if the power of the UPS battery unit does not meet the required power of the target DC load, the control module 130 controls the first power conversion unit to output the first DC power, first charging the UPS battery unit and supplying power to the target DC load at the same time. After the UPS battery unit is fully charged, the UPS battery unit is controlled to supply power to the target DC load, so as to calibrate the UPS battery unit according to the charging and discharging amounts.

[0114] In some embodiments, the control module controls the first power conversion unit and the UPS battery unit according to the working mode of the UPS battery unit and the power of the UPS battery unit, and is specifically used to: when the working mode of the UPS battery unit is the second working mode, control the UPS battery unit to supply power to the target DC load until the power of the UPS battery unit is reduced to a third preset power threshold; wherein the first preset power threshold is greater than the third preset power threshold.

[0115] Specifically, when the UPS battery unit is in the second working mode, it enters the anti-floating charge mode, and the control module 130 controls the UPS battery unit to supply power to the target DC load to reduce the power of the UPS battery unit until the power of the UPS battery unit is reduced to 80%, and stops supplying power to the target DC load. In this way, in the process of the power generation unit supplying power to the target DC load and the UPS battery unit, the floating charge of the UPS battery unit is reduced or eliminated, and the service life of the UPS battery unit is increased.

[0116] In some embodiments, the first power conversion unit may include a first DC / DC converter, which is suitable for converting the direct current output by the power generation unit to output a first direct current. The control module 130 is also used to: when the power generation power of the power generation unit meets the required power of the target DC load, control the first DC / DC converter to output the first direct current to power the UPS battery unit and the target DC load.

[0117] Specifically, the power generation unit may include at least one of a photovoltaic module and a wind power module. Due to the instability and volatility of the power generation unit, taking the photovoltaic module as an example, when the external environment light and temperature are not good, the power generation power of the photovoltaic module may not meet the demand of the target DC load. In order to enable the electrical equipment in the container energy storage system to operate normally, it is necessary to collect the power generation power of the photovoltaic module and the required power of the target DC load in real time. When the power generation power of the power generation unit meets the required power of the target DC load, the target DC load is powered by the power generation unit. Since the power output by the power generation unit cannot directly meet the power supply voltage of the target DC load, it is necessary to convert the DC power output by the power generation unit through the first DC / DC converter to output the first DC power to power the UPS battery unit and the target DC load, thereby reducing energy loss, improving energy utilization, and reducing the power consumption of the auxiliary power supply. In addition, in the absence of an auxiliary power supply, the black start of the container energy storage system can also be achieved.

[0118] In some embodiments, the first power conversion unit may also include a first DC / AC converter, which is suitable for converting the second direct current output by the first DC / DC converter to output a first alternating current. The control module 130 is also used to: when the power generation power of the power generation unit meets the sum of the required power of the target DC load and the required power of the AC load, control the first DC / AC converter to output the first alternating current to power the AC load.

[0119] Specifically, when the power generation of the power generation unit can simultaneously meet the power requirements of the target DC load and the AC load, the power generation unit can also power the AC load while supplying power to the target DC load. Since the power output by the power generation unit cannot directly meet the power supply voltage of the AC load, it is necessary to convert the second DC power output by the first DC / DC converter through the first DC / DC converter to output the first AC power to supply power to the AC load, thereby maximizing the utilization rate of the power output by the power generation unit, reducing the abandoned light, and reducing the energy consumption of the auxiliary power supply.

[0120] It should be noted that for details not disclosed in the control device of the container energy storage system in the embodiment of the present invention, please refer to the details disclosed in the control method of the container energy storage system in the embodiment of the present invention, and the details will not be repeated here.

[0121] Corresponding to the above embodiments, the present application also proposes a container energy storage system.

[0122] like Figure 6 As shown, the container energy storage system 200 of some embodiments of the present application includes a power generation unit 10, a first power conversion unit 20, a UPS battery unit 30 and the control device 100 of the container energy storage system mentioned above.

[0123] In some embodiments, the power generation unit 10 may include at least one of a photovoltaic power generation component and a wind power generation component.

[0124] For details not disclosed in the container energy storage system of some embodiments of the present application, please refer to the details disclosed in the power distribution device of the container energy storage system of some embodiments of the present application, and the details will not be repeated here. Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application, not to limit it; although the present application is described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that it is still possible to modify the technical solutions recorded in the aforementioned embodiments, or to replace some or all of the technical features therein by equivalent; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and description of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A control method for a container energy storage system, characterized in that: The container energy storage system includes a first power conversion unit and a UPS battery unit, wherein the first power conversion unit is adapted to be connected to a power generation unit and convert the power output by the power generation unit to supply power to the UPS battery unit and the target DC load in the container energy storage system, and the method includes: Determining an operating mode of the UPS battery unit; The first power conversion unit and the UPS battery unit are controlled according to the working mode of the UPS battery unit and the power level of the UPS battery unit.

2. The control method according to claim 1, characterized in that: Determining the operating mode of the UPS battery unit includes: Obtaining a calibration period of the UPS battery unit; When the verification cycle of the UPS battery unit is reached, determining that the operating mode of the UPS battery unit is the first operating mode; In the case that the verification cycle of the UPS battery unit has not been reached, if the power level of the UPS battery unit reaches a first preset power threshold, it is determined that the operating mode of the UPS battery unit is the second operating mode.

3. The control method according to claim 2, characterized in that: The controlling the first power conversion unit and the UPS battery unit according to the working mode of the UPS battery unit and the power of the UPS battery unit comprises: When the working mode of the UPS battery unit is the first working mode, if the power of the UPS battery unit meets the required power of the target DC load, the UPS battery unit is controlled to supply power to the target DC load until the power of the UPS battery unit decreases to a second preset power threshold; Wherein, the first preset power threshold is greater than the second preset power threshold.

4. The control method according to claim 3, characterized in that: The controlling the first power conversion unit and the UPS battery unit according to the working mode of the UPS battery unit and the power of the UPS battery unit also includes: When the power level of the UPS battery unit is reduced to a second preset power threshold, the first power conversion unit is controlled to output a first direct current to charge the UPS battery unit.

5. The control method according to claim 3, characterized in that: The controlling the first power conversion unit and the UPS battery unit according to the working mode of the UPS battery unit and the power of the UPS battery unit comprises: When the power of the UPS battery unit does not meet the power requirement of the target DC load, the first power conversion unit is controlled to output a first DC power to supply power to the UPS battery unit and the target DC load.

6. The control method according to claim 2, characterized in that: The controlling the first power conversion unit and the UPS battery unit according to the working mode of the UPS battery unit and the power of the UPS battery unit comprises: When the working mode of the UPS battery unit is the second working mode, controlling the UPS battery unit to supply power to the target DC load until the power of the UPS battery unit decreases to a third preset power threshold; Wherein, the first preset power threshold is greater than the third preset power threshold.

7. The control method according to claim 1, characterized in that: The first power conversion unit includes a first DC / DC converter, and the first DC / DC converter is suitable for converting the direct current output by the power generation unit to output a first direct current. The method further includes: When the power generated by the power generation unit meets the power requirement of the target DC load, the first DC / DC converter is controlled to output the first DC power to supply power to the UPS battery unit and the target DC load.

8. The control method according to claim 7, characterized in that: The first power conversion unit further includes a first DC / AC converter, wherein the first DC / AC converter is adapted to convert the second direct current output by the first DC / DC converter to output a first alternating current, and the method further includes: When the power generation power of the power generation unit meets the sum of the power requirements of the target DC load and the AC load, the first DC / AC converter is controlled to output the first AC power to supply power to the AC load.

9. A control device for a container energy storage system, characterized in that: The container energy storage system includes a first power conversion unit and a UPS battery unit, wherein the first power conversion unit is adapted to be connected to a power generation unit and convert the power output by the power generation unit to supply power to the UPS battery unit and the target DC load in the container energy storage system, and the device includes: A determination module, used to determine the operating mode of the UPS battery unit; An acquisition module, used to acquire the power of the UPS battery unit; A control module is used to control the first power conversion unit and the UPS battery unit according to the working mode of the UPS battery unit and the power level of the UPS battery unit.

10. The control device according to claim 9, characterized in that: The determination module determines the working mode of the UPS battery unit, specifically for: Obtaining a calibration period of the UPS battery unit; When the verification cycle of the UPS battery unit is reached, determining that the operating mode of the UPS battery unit is the first operating mode; In the case that the verification cycle of the UPS battery unit has not been reached, if the power level of the UPS battery unit reaches a first preset power threshold, it is determined that the operating mode of the UPS battery unit is the second operating mode.

11. The control device according to claim 10, characterized in that: The control module controls the first power conversion unit and the UPS battery unit according to the working mode of the UPS battery unit and the power of the UPS battery unit, specifically for: When the working mode of the UPS battery unit is the first working mode, if the power of the UPS battery unit meets the required power of the target DC load, the UPS battery unit is controlled to supply power to the target DC load until the power of the UPS battery unit decreases to a second preset power threshold; Wherein, the first preset power threshold is greater than the second preset power threshold.

12. The control device according to claim 11, characterized in that: The control module is also used to control the first power conversion unit to output a first direct current to charge the UPS battery unit when the power level of the UPS battery unit is reduced to a second preset power threshold.

13. The control device according to claim 11, characterized in that: The control module is also used to control the first power conversion unit to output the first direct current to supply power to the UPS battery unit and the target DC load when the power of the UPS battery unit does not meet the required power of the target DC load.

14. The control device according to claim 10, characterized in that: The control module controls the first power conversion unit and the UPS battery unit according to the working mode of the UPS battery unit and the power of the UPS battery unit, specifically for: When the working mode of the UPS battery unit is the second working mode, controlling the UPS battery unit to supply power to the target DC load until the power of the UPS battery unit decreases to a third preset power threshold; Wherein, the first preset power threshold is greater than the third preset power threshold.

15. A container energy storage system, characterized in that: include: A power generation unit, a first power conversion unit, a UPS battery unit and a control device for a container energy storage system as claimed in any one of claims 9 to 14.

16. The container energy storage system according to claim 15, characterized in that: The power generation unit includes at least one of a photovoltaic power generation component and a wind power generation component.

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