Container energy storage system and power distribution device and power distribution method thereof

Abstract

The invention discloses a container energy storage system and a power distribution device and method thereof.The power distribution device comprises a first electric energy conversion unit and a control unit, and the first electric energy conversion unit is connected with a power generation unit and used for converting electric energy output by the power generation unit; the controller is used for controlling the first electric energy conversion unit to supply power to a battery energy storage unit and a target direct-current load in the container energy storage system according to the electric quantity of the battery energy storage unit and the required power of a power grid when a discharging instruction of the power grid is received and before the discharging moment is reached, and controlling the first electric energy conversion unit to supply power to the battery energy storage unit or the target direct-current load according to the electric quantity of the battery energy storage unit and the required power of the power grid. According to the power distribution device, the battery energy storage unit is charged in advance before the discharge moment is reached, so that the electric quantity of the battery energy storage unit can meet the required power of a power grid, the stability of the power grid is improved, power can be supplied to a direct-current load, abandoned light is reduced, the energy utilization rate is improved, and the power consumption of the system is reduced.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a power distribution device of a container energy storage system, a power distribution method of a container energy storage system, and a container energy storage system. 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, some related control schemes fail to fully utilize energy in energy storage and supply in energy storage systems, resulting in energy waste.

[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 a first power conversion unit converts the electric energy output by the power generation unit to supply power to a battery energy storage unit and a target DC load in the container energy storage system, and when receiving a discharge instruction from a power grid, wherein the discharge instruction of the power grid includes the discharge time of the battery energy storage unit and the required power of the power grid, before the discharge time arrives, the control unit controls the first power conversion unit to supply power to the battery energy storage unit or the target DC load according to the power of the battery energy storage unit and the required power of the power grid, so that the battery energy storage unit is charged in advance before the discharge time arrives, so that the power of the battery energy storage unit can meet the required power of the power grid, thereby improving the stability of the power grid, and can also supply power to the DC load, reduce abandoned light, improve energy utilization, and reduce system power consumption.

[0005] In a first aspect, the present application provides a power distribution device for a container energy storage system, comprising: a first power conversion unit, the first power conversion unit being suitable for connecting to a power generation unit and converting the power output by the power generation unit to power a battery energy storage unit and a target DC load in the container energy storage system; a control unit being configured to receive a discharge instruction from a power grid, wherein the discharge instruction from the power grid includes a discharge time of the battery energy storage unit and a required power of the power grid, and before the discharge time arrives, the first power conversion unit is controlled to power the battery energy storage unit or the target DC load according to the power of the battery energy storage unit and the required power of the power grid.

[0006] In the technical solution of the embodiment of the present application, when receiving the discharge instruction of the power grid, the control unit obtains the required power of the power grid and the discharge time of the battery energy storage unit carried in the discharge instruction according to the discharge instruction. Before the discharge time arrives, the control unit controls the electric energy output by the first electric energy conversion unit according to the power of the battery energy storage unit and the required power of the power grid to determine whether to supply power to the battery energy storage unit or the target DC load. For example, when the power of the battery energy storage unit can meet the required power of the power grid, the control unit controls the first electric energy conversion unit to convert the electric energy output by the power generation unit to supply power to the target DC load; for another example, when the power of the battery energy storage unit cannot meet the required power of the power grid, the control unit controls the first electric energy conversion unit to convert the electric energy output by the power generation unit to charge the battery energy storage unit. Thus, before the discharge time is reached, the battery energy storage unit is charged in advance, so that the power of the battery energy storage unit can meet the required power of the power grid, and can also supply power to the DC load, reduce abandoned light, improve energy utilization, and reduce system power consumption.

[0007] In some embodiments, the first power conversion unit includes 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, wherein the control unit is further configured to, when the power of the battery energy storage unit does not meet the power requirement of the power grid, if the power generation power of the power generation unit meets the power requirement of the power grid, control the first DC / DC converter to output the first direct current to charge the battery energy storage unit until the power of the battery energy storage unit meets the power requirement of the power grid.

[0008] Before the discharge time of the battery energy storage unit arrives, if the power of the battery energy storage unit cannot meet the power demand of the power grid, the control unit first controls the first DC / DC converter to output the first direct current to charge the battery energy storage unit, so that the battery energy storage unit can meet the demand of the power grid when the discharge time arrives, reduce the voltage fluctuation that may be caused by the randomness and intermittency of the power generation unit, improve the stability of the power grid, and at the same time improve the utilization rate of the system energy.

[0009] In some embodiments, the control unit is further configured to control the first DC / DC converter to output a second DC power to power the target DC load if the power generation power of the power generation unit meets the power generation power requirement of the target DC load when the power generation power of the power generation unit does not meet the power requirement of the power grid.

[0010] The electric energy generated by the power generation unit is used to supply power to the target DC load, and there is no need to use an auxiliary power supply (mains power) to supply power to the target DC load, which reduces the energy consumption of the system and also improves the energy utilization rate.

[0011] In some embodiments, the control unit is further configured to control the first DC / DC converter to output the first direct current to charge the battery energy storage unit when the power generation power of the power generation unit does not meet the required power of the target DC load.

[0012] When the power generation unit is low, it can neither meet the power demand of the grid nor the power demand of the target DC load. In order to improve energy utilization and reduce abandoned light, the battery energy storage unit can be charged first.

[0013] In some embodiments, the control unit is further configured to control the first DC / DC converter to output a second DC power to supply power to the target DC load if the power generation power of the power generation unit meets the power requirement of the target DC load when the power of the battery energy storage unit meets the power requirement of the power grid.

[0014] Before the discharge time of the battery energy storage unit arrives, the power of the battery energy storage unit is sufficient to meet the power demand of the power grid. When the power generation power of the power generation unit meets the power demand of the target DC load, the first DC / DC converter can be controlled to output the second DC power to supply power to the target DC load. No auxiliary power supply (mains power) is required to supply power to the target DC load. The electric energy generated by the power generation unit is directly used to supply power to the target DC load, which can reduce energy loss, thereby reducing system energy consumption, improving energy utilization, and realizing black start of the system without an auxiliary power supply.

[0015] In some embodiments, the control unit is further configured to control the first DC / DC converter to output the first direct current to charge the battery energy storage unit when the power generation power of the power generation unit does not meet the required power of the target DC load.

[0016] Although the power of the battery energy storage unit can meet the power demand of the power grid, the power generation power of the power generation unit cannot meet the power demand of the target DC load. In order to improve energy utilization and reduce abandoned light, the first DC / DC converter is controlled to convert the output power of the power generation unit into the first DC power to charge the battery energy storage unit.

[0017] In some embodiments, the above-mentioned power distribution device also includes: a second power conversion unit, which is suitable for connecting to an auxiliary power supply and converting the electric energy provided by the auxiliary power supply to supply power to the target DC load; the control unit is also configured to control the second power conversion unit to supply power to the target DC load when the power generation power of the power generation unit does not meet the required power of the target DC load.

[0018] When the power generated by the power generation unit cannot meet the required power of the target DC load, the target DC load is also powered by the auxiliary power supply so that the electrical equipment can operate stably.

[0019] In some embodiments, the second power conversion unit includes a first AC / DC converter, which is suitable for converting the electric energy provided by the auxiliary power supply to output a third direct current, wherein the control unit is further configured to control the first AC / DC converter to output the third direct current to power the target DC load when the power generation power of the power generation unit does not meet the required power of the target DC load.

[0020] Since the target DC load is a low-voltage load, the output voltage of the auxiliary power supply (mains power) is generally 220V AC. In order to adapt to the power supply voltage of the target DC load, the electric energy provided by the auxiliary power supply is converted by the first AC / DC converter to output the third DC power to power the target DC load, so that the electrical equipment can operate stably.

[0021] In some embodiments, the power supply output end of the auxiliary power supply is also connected to the AC load in the container energy storage system to supply power to the AC load so that the electrical equipment can operate stably and meet user needs.

[0022] In some embodiments, the control unit includes at least one of an EMS controller of the power grid, a controller of the first power conversion unit, and a controller of the second power conversion unit.

[0023] By integrating the various controllers in the container energy storage system into an energy storage domain controller (control unit), a smart energy management system is formed, which can intelligently adjust 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.

[0024] In a second aspect, the present application provides a power distribution method for a container energy storage system, wherein the container energy storage system includes a first power conversion unit, which is suitable for connecting to a power generation unit and converting the power output by the power generation unit to power a battery energy storage unit and a target DC load in the container energy storage system. The method includes: receiving a discharge instruction from a power grid, wherein the discharge instruction of the power grid includes a discharge time of the battery energy storage unit and a required power of the power grid; before the discharge time arrives, controlling the first power conversion unit to power the battery energy storage unit or the target DC load according to the power of the battery energy storage unit and the required power of the power grid.

[0025] In the technical solution of the embodiment of the present application, when a discharge instruction of the power grid is received, the power demand of the power grid and the discharge time of the battery energy storage unit carried in the discharge instruction are obtained according to the discharge instruction. Before the discharge time arrives, the electric energy output by the first electric energy conversion unit is controlled according to the electric power of the battery energy storage unit and the power demand of the power grid to determine whether to supply power to the battery energy storage unit or the target DC load. For example, when the electric power of the battery energy storage unit can meet the power demand of the power grid, the control unit controls the first electric energy conversion unit to convert the electric energy output by the power generation unit to supply power to the target DC load; for another example, when the electric power of the battery energy storage unit cannot meet the power demand of the power grid, the control unit controls the first electric energy conversion unit to convert the electric energy output by the power generation unit to charge the battery energy storage unit. Thus, before the discharge time is reached, the battery energy storage unit is charged in advance, so that the electric power of the battery energy storage unit can meet the power demand of the power grid, and can also supply power to the DC load, reduce the abandonment of light, improve energy utilization, and reduce system power consumption.

[0026] In some embodiments, the first power conversion unit includes a first DC / DC converter, the first DC / DC converter is suitable for converting the direct current output by the power generation unit to output a first direct current, and the first power conversion unit is controlled to supply power to the battery energy storage unit or the target DC load according to the power of the battery energy storage unit and the power required by the power grid, including: when the power of the battery energy storage unit does not meet the power required by the power grid, if the power generation power of the power generation unit meets the power required by the power grid, then the first DC / DC converter is controlled to output the first direct current to charge the battery energy storage unit until the power of the battery energy storage unit meets the power required by the power grid.

[0027] Before the discharge time of the battery energy storage unit arrives, if the power of the battery energy storage unit cannot meet the power demand of the power grid, the first DC / DC converter is controlled to output the first direct current to charge the battery energy storage unit, so that the battery energy storage unit can meet the demand of the power grid when the discharge time arrives, reducing the voltage fluctuation that may be caused by the randomness and intermittency of the power generation unit, improving the stability of the power grid, and at the same time improving the utilization rate of the system energy.

[0028] In some embodiments, controlling the first power conversion unit to supply power to the battery energy storage unit or the target DC load according to the power of the battery energy storage unit and the power demand of the power grid also includes: when the power generation power of the power generation unit does not meet the power demand of the power grid, if the power generation power of the power generation unit meets the power demand of the target DC load, controlling the first DC / DC converter to output the second DC power to supply power to the target DC load; if the power generation power of the power generation unit does not meet the power demand of the target DC load, controlling the first DC / DC converter to output the first DC power to charge the battery energy storage unit.

[0029] The target DC load is powered by the electric energy generated by the power generation unit, without the need to use an auxiliary power supply (mains power) to power the target DC load, which reduces the energy consumption of the system and also improves energy utilization. When the power generation of the power generation unit is low, it can neither meet the power requirements of the grid nor the power requirements of the target DC load. In order to improve energy utilization and reduce abandoned light, the battery energy storage unit can be charged first.

[0030] In some embodiments, controlling the first power conversion unit to supply power to the battery energy storage unit or the target DC load according to the power level of the battery energy storage unit and the power requirement of the power grid also includes: when the power level of the battery energy storage unit meets the power requirement of the power grid, if the power generation power of the power generation unit meets the power requirement of the target DC load, controlling the first DC / DC converter to output a second DC power to supply power to the target DC load.

[0031] Before the discharge time of the battery energy storage unit arrives, the power of the battery energy storage unit is sufficient to meet the power demand of the power grid. In order to reduce system energy consumption and improve energy utilization, when the power generation power of the power generation unit meets the power demand of the target DC load, the first DC / DC converter can be controlled to output the second DC power to supply power to the target DC load. There is no need for an auxiliary power supply (mains power) to supply power to the target DC load. The electric energy generated by the power generation unit is directly used to supply power to the target DC load, which can reduce energy loss, thereby reducing system energy consumption, improving energy utilization, and realizing black start of the system without an auxiliary power supply.

[0032] In some embodiments, controlling the first power conversion unit to supply power to the battery energy storage unit or the target DC load according to the power of the battery energy storage unit and the power demand of the power grid also includes: when the power generation power of the power generation unit does not meet the power demand of the target DC load, controlling the first DC / DC converter to output the first DC power to charge the battery energy storage unit.

[0033] Although the power of the battery energy storage unit can meet the power demand of the power grid, the power generation of the power generation unit cannot meet the power demand of the target DC load. In order to improve energy utilization and reduce abandoned light, the first DC / DC converter is controlled to convert the output power of the power generation unit into the first DC power to charge the battery energy storage unit.

[0034] In some embodiments, the container energy storage system also includes a second power conversion unit, which is suitable for connecting to an auxiliary power supply and converting the electric energy provided by the auxiliary power supply to supply power to a target DC load in the container energy storage system. The method also includes: when the power generation power of the power generation unit does not meet the required power of the target DC load, controlling the second power conversion unit to supply power to the target DC load.

[0035] When the power generated by the power generation unit cannot meet the power demand of the target DC load, the target DC load is also powered by the auxiliary power supply so that the electrical equipment can operate stably. Since the target DC load is a low-voltage load, the output voltage of the auxiliary power supply (mains power) is generally 220V AC. In order to adapt to the power supply voltage of the target DC load, the auxiliary power supply is converted by the first AC / DC converter to output the third DC power to power the target DC load so that the electrical equipment can operate stably.

[0036] In a third aspect, an embodiment of the present application provides a container energy storage system, including a power generation unit and a power distribution device of the above-mentioned container energy storage system.

[0037] In some embodiments, the power generation unit includes at least one of a photovoltaic power generation component and a wind power generation component.

[0038] 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

[0039] 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:

[0040] Figure 1 is a block diagram of a power distribution device of a container energy storage system according to some embodiments;

[0041] Figure 2is a schematic diagram of a power distribution device of a container energy storage system according to some embodiments;

[0042] Figure 3 is a schematic diagram of the position of photovoltaic components according to some embodiments;

[0043] Figure 4 is a flow chart of a power distribution method for a container energy storage system according to some embodiments;

[0044] Figure 5 is a flow chart of a power distribution method for a container energy storage system according to some embodiments;

[0045] Figure 6 is a block diagram of a container energy storage system according to some embodiments. DETAILED DESCRIPTION

[0046] The following embodiments of the technical solution of the present application will be 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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).

[0052] 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.

[0053] 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.

[0054] 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.

[0055] Therefore, in an embodiment of the present application, the first power conversion unit converts the electric energy output by the power generation unit to supply power to the battery energy storage unit and the target DC load in the container energy storage system. When receiving the discharge instruction from the power grid and before the discharge time arrives, the first power conversion unit is controlled to supply power to the battery energy storage unit or the target DC load according to the power of the battery energy storage unit and the power required by the power grid. The power distribution device of the present invention charges the battery energy storage unit in advance before the discharge time arrives, so that the power of the battery energy storage unit can meet the power required by the power grid, improve the stability of the power grid, and can also supply power to the DC load, reduce abandoned light, improve energy utilization, and reduce system power consumption.

[0056] For the convenience of explanation, the following embodiments are combined Figure 1 The power distribution device of the container energy storage system according to the embodiment of the present application is described.

[0057] Reference Figure 1 and Figure 2 In the present application, the power distribution device of the container energy storage system may include: a first power conversion unit 10 and a control unit 20.

[0058] The first power conversion unit 10 is suitable for connecting to the power generation unit and converting the power output by the power generation unit to supply power to the battery energy storage unit and the target DC load in the container energy storage system. The control unit 20 is configured to receive a discharge instruction from the power grid, wherein the discharge instruction of the power grid includes the discharge time of the battery energy storage unit and the required power of the power grid. Before the discharge time arrives, the first power conversion unit is controlled to supply power to the battery energy storage unit or the target DC load according to the power of the battery energy storage unit and the required power of the power grid.

[0059] Specifically, the power generation unit may include one of a photovoltaic power generation component and a wind power generation component. Since the photovoltaic power generation component and the wind power generation component are limited by the installation location or the influence of weather factors, there is randomness and intermittency. When the energy storage power station needs the battery energy storage unit to discharge and participate in the peak and frequency regulation characteristics of the power grid, in order to improve the stability and continuity of the battery energy storage unit incorporating into the power grid, before the discharge time of the battery energy storage unit, the power generation unit charges the battery energy storage unit so that the battery energy storage unit has enough power to participate in the regulation of the power grid when the discharge time is reached, thereby improving the stability of the power grid.

[0060] Specifically, when receiving the discharge instruction of the power grid, the control unit 20 obtains the power demand of the power grid and the discharge time of the battery energy storage unit carried in the discharge instruction according to the discharge instruction. Before the discharge time arrives, the control unit 20 controls the electric energy output by the first power conversion unit 10 according to the power of the battery energy storage unit and the power demand of the power grid to determine whether to power the battery energy storage unit or the target DC load. For example, when the power of the battery energy storage unit can meet the power demand of the power grid, the control unit 20 controls the first power conversion unit 10 to convert the electric energy output by the power generation unit to power the target DC load; for another example, when the power of the battery energy storage unit cannot meet the power demand of the power grid, the control unit 20 controls the first power conversion unit 10 to convert the electric energy output by the power generation unit to charge the battery energy storage unit. Thus, before the discharge time is reached, the battery energy storage unit is charged in advance, so that the power of the battery energy storage unit can meet the power demand of the power grid, and can also power the DC load, reduce the abandonment of light, improve energy utilization, and reduce system power consumption.

[0061] In some embodiments, the first power conversion unit 10 includes a first DC / DC converter 11, which is suitable for converting the direct current output by the power generation unit to output a first direct current, wherein the control unit 20 is further configured to, when the power of the battery energy storage unit does not meet the power requirement of the power grid, if the power generation power of the power generation unit meets the power requirement of the power grid, control the first DC / DC converter 11 to output the first direct current to charge the battery energy storage unit until the power of the battery energy storage unit meets the power requirement of the power grid.

[0062] Specifically, before the discharge time of the battery energy storage unit arrives, if the power of the battery energy storage unit cannot meet the power demand of the power grid, the control unit 20 further determines whether the power generation of the power generation unit can meet the power demand of the power grid. When the power generation of the power generation unit can meet the demand of the power grid, the control unit 20 controls the power generation unit to generate electric energy to charge the battery energy storage unit. Since the electric energy output by the battery energy storage unit cannot directly meet the power supply voltage of the power grid, the control unit 20 controls the first DC / DC converter 11 to output the first direct current to charge the battery energy storage unit, so that the battery energy storage unit can meet the demand of the power grid when the discharge time arrives, reduce the voltage fluctuation that may be caused by the randomness and intermittency of the power generation unit, improve the stability of the power grid, and improve the utilization rate of the system energy.

[0063] It should be noted that when judging whether the power generation of the power generation unit can meet the power demand of the power grid, it can be judged based on the power of the battery energy storage unit. For example, if the power demand of the power grid is 1000W, and the power of the battery energy storage unit can provide 800W, when the power generation generated by the power generation unit exceeds the 200W of the battery energy storage unit, it can be considered that the power generation of the power generation unit meets the power demand of the power grid. It can also be based on a direct comparison between the power generation of the power generation unit and the power demand of the power grid. When the power generation of the power generation unit exceeds the power demand of the power grid, it can be considered that the power generation of the power generation unit meets the power demand of the power grid. The judgment method is not specifically limited here.

[0064] In some embodiments, the control unit 20 is further configured to control the first DC / DC converter to output the second DC power to supply power to the target DC load if the power generated by the power generation unit does not meet the power demand of the power grid, and if the power generated by the power generation unit meets the power demand of the target DC load. The voltage of the first DC power is greater than the voltage of the second DC power, and the power supply voltage of the target DC load is less than the first preset voltage, which is generally 12V or 24V, that is, the target DC load is a low-voltage DC load.

[0065] Specifically, before the discharge time is reached, when the control unit 20 determines that the power of the battery energy storage unit cannot meet the power demand of the power grid, it first determines that the power generation of the power generation unit can meet the power demand of the power grid. If it cannot meet the power demand, the battery energy storage unit will not be charged first. Since the target DC load is a low-voltage load, the control unit 20 can further determine whether the power generation of the power generation unit can meet the power demand of the target DC load. If it meets the power demand, the power generated by the power generation unit is used to power the target DC load. In this way, there is no need to use an auxiliary power supply (mains power) to power the target DC load, which reduces the energy consumption of the system and also improves energy utilization.

[0066] In some embodiments, the control unit 20 is further configured to control the first DC / DC converter 11 to output the first direct current to charge the battery energy storage unit when the power generation power of the power generation unit does not meet the required power of the target DC load.

[0067] Specifically, before the discharge time is reached, when the control unit 20 determines that the power of the battery energy storage unit cannot meet the power demand of the power grid, if the power generation of the power generation unit can neither meet the power demand of the power grid nor meet the power demand of the target DC load, it means that the power generation unit generates less power. In order to improve the utilization rate of energy and reduce the abandonment of light, the battery energy storage unit can be charged first. For example, the first DC power is output through the first DC / DC converter 11 to charge the battery energy storage unit.

[0068] In some embodiments, the control unit 20 is further configured to control the first DC / DC converter 11 to output a second DC power to supply power to the target DC load if the power generation power of the power generation unit meets the power requirement of the target DC load when the power of the battery energy storage unit meets the power requirement of the power grid.

[0069] Specifically, before the discharge time of the battery energy storage unit arrives, the power of the battery energy storage unit is sufficient to meet the power demand of the power grid. At this time, the electric energy generated by the power generation unit does not charge the battery energy storage unit, and further determines whether the power generation of the power generation unit can meet the power demand of the target DC load. Among them, when the power generation of the power generation unit can meet the power demand of the target DC load, the first DC / DC converter 11 can be controlled to output the second DC power to power the target DC load, and no auxiliary power supply (mains power) is required to power the target DC load. The electric energy generated by the power generation unit is directly used to power the target DC load, which can reduce energy loss, thereby reducing system energy consumption, improving energy utilization, and realizing the black start of the system without an auxiliary power supply.

[0070] In some embodiments, the control unit 20 is further configured to control the first DC / DC converter 11 to output the first direct current to charge the battery energy storage unit when the power generation power of the power generation unit does not meet the required power of the target DC load.

[0071] That is to say, when the power of the battery energy storage unit can meet the power demand of the power grid, the power generation unit does not need to charge the battery energy storage unit. Due to the randomness and instability of the power generation unit, the generated electric energy is unstable. When the power generation unit generates less electric energy, that is, the power generation power of the power generation unit cannot meet the power demand of the target DC load, the first DC / DC converter 11 is controlled to convert the output electric energy of the power generation unit into the first direct current to charge the battery energy storage unit, thereby improving energy utilization and reducing abandoned light.

[0072] 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 currents with different voltage values ​​to meet the power supply voltage of the corresponding modules. For example, the target DC load is a low-voltage DC load, and the required power supply voltage is about 12V / 24V; for another example, the battery energy storage unit of the container energy storage system is a high-voltage energy storage unit, and the required power supply voltage is generally above 1000V.

[0073] In some embodiments, Figure 2As shown, the above-mentioned power distribution device may also include: a second power conversion unit 30, which is suitable for connecting to an auxiliary power supply and converting the electric energy provided by the auxiliary power supply to supply power to the target DC load; the control unit 20 is also configured to control the second power conversion unit 30 to supply power to the target DC load when the power generation power of the power generation unit does not meet the required power of the target DC load.

[0074] That is to say, regardless of whether the power of the battery energy storage unit can meet the power demand of the power grid, or when the power generation power of the battery energy storage unit cannot meet the power demand of the power grid, when the power generation power of the power generation unit cannot meet the power demand of the target DC load, the target DC load can also be powered by an auxiliary power supply, so that the electrical equipment can operate stably and improve the user experience.

[0075] In some embodiments, the second power conversion unit 30 may include a first AC / DC converter 31, which is suitable for converting the electric energy provided by the auxiliary power supply to output a third direct current, wherein the control unit 20 is also configured to control the first AC / DC converter 31 to output the third direct current to power the target DC load when the power generation power of the power generation unit does not meet the required power of the target DC load.

[0076] Specifically, since the target DC load is a low-voltage load, the output voltage of the auxiliary power supply (mains power) is generally 220V AC. In order to adapt the power supply voltage of the target DC load, the control unit 20 can convert the electric energy provided by the auxiliary power supply by controlling the first AC / DC converter 31, output a third DC power (adapting the power supply voltage of the target DC load), and supply power to the target DC load, so that the electrical equipment can operate stably.

[0077] In some embodiments, Figure 2 As shown, the power supply output end of the auxiliary power supply is also connected to the AC load in the container energy storage system to supply power to the AC load so that the electrical equipment can operate stably and meet user needs.

[0078] In some embodiments, the control unit 20 may include at least one of an EMS controller of the power grid, a controller of the first power conversion unit 10 , and a controller of the second power conversion unit 30 .

[0079] Specifically, 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 AC / DC converter, etc.) and the EMS controller of the power grid can be integrated into an energy storage domain controller (control unit) 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.

[0080] 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 2 Or when the ambient temperature is less than 25℃, collect the sagging photovoltaic panels.

[0081] The photovoltaic module is used as the energy source of the battery energy storage unit participating in the grid regulation. The electric energy generated by the photovoltaic module is converted by the first DC / DC converter and then charged to the battery energy storage unit, so that the power of the battery energy storage unit is sufficient to participate in the grid regulation and improve the energy utilization rate. When the power generation power of the photovoltaic module can still meet the power demand of the target DC load, the electric energy generated by the photovoltaic module is also converted by the first DC / DC converter, and the second DC power output is used to supply power to the target DC load, so as to maximize the utilization of energy and reduce the energy consumption of the system.

[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 power of the photovoltaic components, the power of the battery energy storage unit and the power demand of the power grid in real time. According to the discharge instructions of the power grid, it is judged in advance whether the power of the battery energy storage unit can meet the power demand of the power grid. When the power demand of the power grid cannot be met, the photovoltaic components will charge the battery energy storage unit so that the battery energy storage unit can meet the regulation of the power grid when the discharge time is reached.

[0084] In summary, in the technical solution of the embodiment of the present application, when receiving the discharge instruction of the power grid, the control unit obtains the required power of the power grid and the discharge time of the battery energy storage unit carried in the discharge instruction according to the discharge instruction. Before the discharge time arrives, the control unit controls the electric energy output by the first power conversion unit according to the power of the battery energy storage unit and the required power of the power grid to determine whether to power the battery energy storage unit or the target DC load. For example, when the power of the battery energy storage unit can meet the required power of the power grid, the control unit controls the first power conversion unit to convert the electric energy output by the power generation unit to power the target DC load; for another example, when the power of the battery energy storage unit cannot meet the required power of the power grid, the control unit controls the first power conversion unit to convert the electric energy output by the power generation unit to charge the battery energy storage unit. Thus, before the discharge time is reached, the battery energy storage unit is charged in advance, so that the power of the battery energy storage unit can meet the required power of the power grid, and can also power the DC load, reduce the abandonment of light, improve energy utilization, and reduce system power consumption.

[0085] Corresponding to the above embodiments, the present application also proposes a power distribution method for a container energy storage system.

[0086] In some embodiments, the container energy storage system includes a first power conversion unit, which is suitable for connecting to a power generation unit and converting the electric energy output by the power generation unit to power a battery energy storage unit and a target DC load in the container energy storage system.

[0087] like Figure 4 As shown, the power distribution method of the container energy storage system of the present application may include the following steps:

[0088] S1, receiving a discharge instruction from a power grid, wherein the discharge instruction from the power grid includes a discharge time of a battery energy storage unit and a required power of the power grid.

[0089] S2, before the discharge time arrives, according to the power of the battery energy storage unit and the power demand of the power grid, control the first power conversion unit to supply power to the battery energy storage unit or the target DC load.

[0090] Specifically, the power generation unit may include one of a photovoltaic power generation component and a wind power generation component. Since the photovoltaic power generation component and the wind power generation component are limited by the installation location or the influence of weather factors, there is randomness and intermittency. When the energy storage power station needs the battery energy storage unit to discharge and participate in the peak and frequency regulation characteristics of the power grid, in order to improve the stability and continuity of the battery energy storage unit incorporating into the power grid, before the discharge time of the battery energy storage unit, the power generation unit charges the battery energy storage unit so that the battery energy storage unit has enough power to participate in the regulation of the power grid when the discharge time is reached, thereby improving the stability of the power grid.

[0091] Specifically, when receiving the discharge instruction of the power grid, the power demand of the power grid and the discharge time of the battery energy storage unit carried in the discharge instruction are obtained according to the discharge instruction. Before the discharge time arrives, the electric energy output by the first power conversion unit is controlled according to the power of the battery energy storage unit and the power demand of the power grid to determine whether to supply power to the battery energy storage unit or the target DC load. For example, when the power of the battery energy storage unit can meet the power demand of the power grid, the first power conversion unit is controlled to convert the electric energy output by the power generation unit to supply power to the target DC load; for another example, when the power of the battery energy storage unit cannot meet the power demand of the power grid, the first power conversion unit is controlled to convert the electric energy output by the power generation unit to charge the battery energy storage unit. Thus, before the discharge time is reached, the battery energy storage unit is charged in advance, so that the power of the battery energy storage unit can meet the power demand of the power grid, and can also supply power to the DC load, reduce abandoned light, improve energy utilization, and reduce system power consumption.

[0092] In some embodiments, the first power conversion unit includes 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, and controlling the first power conversion unit to supply power to the battery energy storage unit or the target DC load according to the power level of the battery energy storage unit and the power required by the power grid, including: when the power level of the battery energy storage unit does not meet the power required by the power grid, if the power generation power of the power generation unit meets the power required by the power grid, controlling the first DC / DC converter to output the first direct current to charge the battery energy storage unit until the power level of the battery energy storage unit meets the power required by the power grid.

[0093] Specifically, before the discharge time of the battery energy storage unit arrives, if the power of the battery energy storage unit cannot meet the power demand of the power grid, it is further determined whether the power generation of the power generation unit can meet the power demand of the power grid. If the power generation of the power generation unit can meet the demand of the power grid, the power generation unit is controlled to generate electric energy to charge the battery energy storage unit. Since the electric energy output by the battery energy storage unit cannot directly meet the power supply voltage of the power grid, the first DC / DC converter is controlled to output the first direct current to charge the battery energy storage unit, so that the battery energy storage unit can meet the demand of the power grid when the discharge time arrives, reduce the voltage fluctuation that may be caused by the randomness and intermittency of the power generation unit, improve the stability of the power grid, and at the same time improve the utilization rate of the system energy.

[0094] In some embodiments, according to the power of the battery energy storage unit and the power demand of the power grid, controlling the first power conversion unit to supply power to the battery energy storage unit or the target DC load also includes: when the power generation power of the power generation unit does not meet the power demand of the power grid, if the power generation power of the power generation unit meets the power demand of the target DC load, controlling the first DC / DC converter to output the second DC power to supply power to the target DC load; if the power generation power of the power generation unit does not meet the power demand of the target DC load, controlling the first DC / DC converter to output the first DC power to charge the battery energy storage unit.

[0095] Specifically, before the discharge time is reached, when it is determined that the power of the battery energy storage unit cannot meet the power demand of the power grid, it is first determined that the power generation of the power generation unit can meet the power demand of the power grid. If it cannot be met, the battery energy storage unit is not charged first. Since the target DC load is a low-voltage load, it can be further determined that the power generation of the power generation unit can meet the power demand of the target DC load. If it is met, the power generated by the power generation unit is used to power the target DC load. In this way, there is no need to use an auxiliary power supply (mains power) to power the target DC load, which reduces the energy consumption of the system and also improves energy utilization. When the power generation of the power generation unit is low, it can neither meet the power demand of the power grid nor the power demand of the target DC load. In order to improve energy utilization and reduce abandoned light, the battery energy storage unit can be charged first.

[0096] In some embodiments, according to the power of the battery energy storage unit and the power demand of the power grid, controlling the first power conversion unit to supply power to the battery energy storage unit or the target DC load also includes: when the power of the battery energy storage unit meets the power demand of the power grid, if the power generation power of the power generation unit meets the power demand of the target DC load, controlling the first DC / DC converter to output the second DC power to supply power to the target DC load.

[0097] Specifically, before the discharge time of the battery energy storage unit arrives, the power of the battery energy storage unit is sufficient to meet the power demand of the power grid. At this time, the electric energy generated by the power generation unit does not charge the battery energy storage unit, and further determines whether the power generation of the power generation unit can meet the power demand of the target DC load. Among them, when the power generation of the power generation unit meets the power demand of the target DC load, the first DC / DC converter can be controlled to output the second DC power to power the target DC load, and there is no need for an auxiliary power supply (mains power) to power the target DC load. The electric energy generated by the power generation unit is directly used to power the target DC load, which can reduce energy loss, thereby reducing system energy consumption, improving energy utilization, and realizing the black start of the system without an auxiliary power supply.

[0098] In some embodiments, according to the power of the battery energy storage unit and the required power of the power grid, controlling the first power conversion unit to supply power to the battery energy storage unit or the target DC load also includes: when the power generation power of the power generation unit does not meet the required power of the target DC load, controlling the first DC / DC converter to output the first direct current to charge the battery energy storage unit.

[0099] That is to say, when the power of the battery energy storage unit can meet the power demand of the power grid, the power generation unit does not need to charge the battery energy storage unit. Due to the randomness and instability of the power generation unit, the generated electric energy is unstable. When the power generation unit generates less electric energy, that is, the power generation power of the power generation unit cannot meet the power demand of the target DC load, the first DC / DC converter is controlled to convert the output electric energy of the power generation unit into the first direct current to charge the battery energy storage unit, in order to improve energy utilization and reduce abandoned light.

[0100] In some embodiments, the container energy storage system also includes a second power conversion unit, which is suitable for connecting to an auxiliary power supply and converting the electric energy provided by the auxiliary power supply to supply power to a target DC load in the container energy storage system. The method also includes: when the power generation power of the power generation unit does not meet the required power of the target DC load, controlling the second power conversion unit to supply power to the target DC load.

[0101] That is to say, whether the power of the battery energy storage unit can meet the power demand of the power grid, or the power of the battery energy storage unit cannot meet the power demand of the power grid, when the power generation of the power generation unit cannot meet the power demand of the target DC load, the target DC load is also powered by the auxiliary power supply, so that the electrical equipment can operate stably. Since the target DC load is a low-voltage load, the output voltage of the auxiliary power supply (mains power) is generally 220V AC. In order to adapt to the power supply voltage of the target DC load, the auxiliary power supply is converted by the first AC / DC converter to output a third DC (adapting to the power supply voltage of the target DC load), and the target DC load is powered, so that the electrical equipment can operate stably.

[0102] In addition, the power supply output end of the auxiliary power supply is also connected to the AC load in the container energy storage system to supply power to the AC load so that the electrical equipment can operate stably and meet user needs.

[0103] As a specific example, Figure 5 As shown, the power distribution method of the container energy storage system of the present invention may include the following steps:

[0104] S101, the EMS controller of the power grid issues a discharge instruction, requiring the battery energy storage unit to discharge the power grid after 1 hour. Among them, 1 hour is the set discharge time, which can be set according to actual conditions.

[0105] S102, determine whether the power of the battery energy storage unit meets the power demand of the power grid. If yes, execute step S103; if not, execute step S107.

[0106] S103, do not charge the battery energy storage unit.

[0107] S104, determining whether the power generated by the photovoltaic module meets the power requirement of the target DC load. If yes, executing step S105; if no, executing step S106.

[0108] S105, controlling the first DC / DC converter to output a second direct current to supply power to the DC load.

[0109] S106, controlling the first DC / DC converter to output a first direct current to charge the battery energy storage unit.

[0110] S107, judging whether the power generated by the photovoltaic module meets the power demand of the power grid. If yes, executing step S108, if not, executing step S109.

[0111] S108, controlling the first DC / DC converter to output a first direct current to charge the battery energy storage unit.

[0112] S109, determining whether the power generated by the photovoltaic module meets the power requirement of the target DC load. If yes, executing step S110; if no, executing step S111.

[0113] S110, controlling the first DC / DC converter to output a second direct current to supply power to a DC load.

[0114] S111, controlling the first DC / DC converter to output a first direct current to charge the battery energy storage unit.

[0115] It should be noted that for details not disclosed in the power distribution method of the container energy storage system in the embodiment of the present invention, please refer to the details disclosed in the power distribution device of the container energy storage system in the embodiment of the present invention, and the details will not be repeated here.

[0116] Corresponding to the above embodiments, the present application also proposes a container energy storage system.

[0117] like Figure 6 As shown, the container energy storage system 100 of some embodiments of the present application includes a power generation unit 130 and the power distribution device 140 of the container energy storage system described above.

[0118] In some embodiments, the power generation unit 130 may include at least one of a photovoltaic power generation component and a wind power generation component.

[0119] 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 power distribution device for a container energy storage system, characterized in that: include: A first electric energy conversion unit, wherein the first electric energy conversion unit is adapted to be connected to a power generation unit and convert the electric energy output by the power generation unit to supply power to a battery energy storage unit and a target DC load in the container energy storage system; The control unit is configured to receive a discharge instruction from a power grid, wherein the discharge instruction of the power grid includes a discharge time of the battery energy storage unit and a required power of the power grid, and before the discharge time is reached, the first power conversion unit is controlled to supply power to the battery energy storage unit or the target DC load according to the power of the battery energy storage unit and the required power of the power grid.

2. The power distribution device 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, wherein the control unit is further configured to: In the case where the power of the battery energy storage unit does not meet the power demand of the power grid, if the power generation power of the power generation unit meets the power demand of the power grid, the first DC / DC converter is controlled to output the first direct current to charge the battery energy storage unit until the power of the battery energy storage unit meets the power demand of the power grid.

3. The power distribution device according to claim 2, characterized in that: The control unit is further configured to, when the power generation power of the power generation unit does not meet the power requirement of the power grid, control the first DC / DC converter to output a second direct current to supply power to the target DC load if the power generation power of the power generation unit meets the power requirement of the target DC load.

4. The power distribution device according to claim 3, characterized in that: The control unit is further configured to control the first DC / DC converter to output the first direct current to charge the battery energy storage unit when the power generation power of the power generation unit does not meet the required power of the target DC load.

5. The power distribution device according to claim 2, characterized in that: The control unit is further configured to, when the power of the battery energy storage unit meets the power requirement of the power grid, control the first DC / DC converter to output a second direct current to supply power to the target DC load if the power generation power of the power generation unit meets the power requirement of the target DC load.

6. The power distribution device according to claim 5, characterized in that: The control unit is further configured to control the first DC / DC converter to output the first direct current to charge the battery energy storage unit when the power generation power of the power generation unit does not meet the required power of the target DC load.

7. The power distribution device according to claim 1, characterized in that: Also includes: a second power conversion unit, the second power conversion unit being adapted to be connected to an auxiliary power supply and converting power provided by the auxiliary power supply to supply power to the target DC load; The control unit is further configured to control the second power conversion unit to supply power to the target DC load when the power generation power of the power generation unit does not meet the power requirement of the target DC load.

8. The power distribution device according to claim 7, characterized in that: The second power conversion unit includes a first AC / DC converter, and the first AC / DC converter is suitable for converting the power provided by the auxiliary power supply to output a third direct current, wherein the control unit is further configured to: When the power generated by the power generation unit does not meet the power requirement of the target DC load, the first AC / DC converter is controlled to output the third DC power to supply power to the target DC load.

9. The power distribution device according to claim 7, characterized in that: The power supply output end of the auxiliary power supply is also connected to the AC load in the container energy storage system to supply power to the AC load.

10. The power distribution device according to claim 7, characterized in that: The control unit includes at least one of an EMS controller of the power grid, a controller of the first power conversion unit, and a controller of the second power conversion unit.

11. A power distribution method for a container energy storage system, characterized in that: The container energy storage system includes a first power conversion unit, which is suitable for connecting to a power generation unit and converting the power output by the power generation unit to supply power to a battery energy storage unit and a target DC load in the container energy storage system. The method includes: Receiving a discharge instruction from a power grid, wherein the discharge instruction from the power grid includes a discharge time of the battery energy storage unit and a required power of the power grid; Before the discharging time arrives, the first power conversion unit is controlled to supply power to the battery energy storage unit or the target DC load according to the power of the battery energy storage unit and the power demand of the power grid.

12. The power distribution method according to claim 11, 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 the first direct current. The first power conversion unit is controlled to supply power to the battery energy storage unit or the target DC load according to the power of the battery energy storage unit and the required power of the power grid, including: In the case where the power of the battery energy storage unit does not meet the power demand of the power grid, if the power generation power of the power generation unit meets the power demand of the power grid, the first DC / DC converter is controlled to output the first direct current to charge the battery energy storage unit until the power of the battery energy storage unit meets the power demand of the power grid.

13. The power distribution method according to claim 12, characterized in that: The controlling the first power conversion unit to supply power to the battery energy storage unit or the target DC load according to the power of the battery energy storage unit and the power demand of the power grid also includes: In the case where the power generation of the power generation unit does not meet the power requirement of the power grid, if the power generation of the power generation unit meets the power requirement of the target DC load, controlling the first DC / DC converter to output a second DC power to supply power to the target DC load; If the power generation power of the power generation unit does not meet the required power of the target DC load, the first DC / DC converter is controlled to output the first DC power to charge the battery energy storage unit.

14. The power distribution method according to claim 12, characterized in that: The controlling the first power conversion unit to supply power to the battery energy storage unit or the target DC load according to the power of the battery energy storage unit and the power demand of the power grid also includes: When the power of the battery energy storage unit meets the power requirement of the power grid, if the power generation power of the power generation unit meets the power requirement of the target DC load, the first DC / DC converter is controlled to output the second DC power to supply power to the target DC load.

15. The power distribution method according to claim 14, characterized in that: The controlling the first power conversion unit to supply power to the battery energy storage unit or the target DC load according to the power of the battery energy storage unit and the power demand of the power grid also includes: When the power generation power of the power generation unit does not meet the required power of the target DC load, the first DC / DC converter is controlled to output the first DC power to charge the battery energy storage unit.

16. The power distribution method according to claim 11, characterized in that: The container energy storage system further includes a second power conversion unit, which is adapted to be connected to an auxiliary power supply and convert the power provided by the auxiliary power supply to supply power to the target DC load. The method further includes: When the power generated by the power generation unit does not meet the power requirement of the target DC load, the second power conversion unit is controlled to supply power to the target DC load.

17. A container energy storage system, characterized in that: include: A power generation unit and a power distribution device of a container energy storage system as claimed in any one of claims 1 to 10.

18. The container energy storage system according to claim 17, 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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