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, and the device comprises a first electric energy conversion unit which is suitable for being connected with a power generation unit and converting the electric energy outputted by the power generation unit, so as to supply power to a target DC load in the container energy storage system, the power supply voltage of the target DC load is smaller than first preset voltage; the second electric energy conversion unit is suitable for being connected with an auxiliary power supply and converting electric energy provided by the auxiliary power supply so as to supply power to the target direct current load; and the control unit is configured to control the first electric energy conversion unit and the second electric energy conversion unit to be switched to supply power to the target direct current load according to the power generation power of the power generation unit and the required power of the target direct current load. According to the power distribution device, the electric energy generated by the power generation unit can be supplied to the direct current load in the container energy storage system, the energy loss is reduced, and the power consumption of the auxiliary power supply 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. Summary of the invention

[0003] In view of the above problems, the present application provides a container energy storage system and a power distribution device and a power distribution method thereof, wherein a first power conversion unit converts the power output by a power generation unit to supply power to a target DC load in the container energy storage system, and a second power conversion unit converts the power provided by an auxiliary power supply to supply power to the target DC load. A control unit controls the first power conversion unit and the second power conversion unit to switch to supply power to the target DC load according to the power generation power of the power generation unit and the power demand of the target DC load, and supplies power to the DC load in the container energy storage system with the power generated by the power generation unit, thereby reducing energy loss, improving energy utilization, reducing power consumption of the auxiliary power supply, and realizing black start of the container energy storage system in the absence of an auxiliary power supply.

[0004] In a first aspect, the present application provides a power distribution device of 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 supply power to a target DC load in the container energy storage system, wherein the power supply voltage of the target DC load is less than a first preset voltage; a second power conversion unit, the second power conversion unit being suitable for connecting to an auxiliary power supply and converting the power provided by the auxiliary power supply to supply power to the target DC load; and a control unit being configured to control the first power conversion unit and the second power conversion unit to switch to supply power to the target DC load according to the power generation power of the power generation unit and the required power of the target DC load.

[0005] In the technical solution of the embodiment of the present application, it is determined whether the target DC load is powered by the power generation unit or the target DC load is powered by the auxiliary power supply according to the power generation power of the power generation unit and the power demand of the target DC load (such as a low-voltage DC load). For example, when the power generation power of the power generation unit can meet the power demand of the target DC load, the target DC load is powered by the power generation unit, such as converting the electric energy output by the power generation unit into the DC voltage required by the target DC load through the first power conversion unit to power the target DC load. For another example, when the power generation power of the power generation unit cannot meet the power demand of the target DC load, the target DC load is powered by the auxiliary power supply, such as converting the electric energy output by the energy storage power supply into the DC voltage required by the target DC load through the second power conversion unit to power the target DC load, and the electric energy generated by the power generation unit can charge the battery in the container energy storage system, etc. Therefore, the power distribution device of the present application uses the electric energy generated by the power generation unit to power the DC load in the container energy storage system, which reduces energy loss, improves energy utilization, reduces the power consumption of the auxiliary power supply, and can also achieve the black start of the container energy storage system without the auxiliary power supply.

[0006] 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 control the first DC / DC converter to output the first direct current to power the target DC load when the power generation power of the power generation unit is greater than the required power of the target DC load.

[0007] When the power generated by the power generation unit is greater than the power demand 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, the DC power output by the power generation unit needs to be converted by the first DC / DC converter to output the first DC power to power the target DC load, wherein the power supply voltage of the target DC load is generally 12V / 24V. In this way, the power of the power generation unit can be fully utilized, energy loss can be reduced, and the power consumption of the auxiliary power supply can also be reduced.

[0008] In some embodiments, the control unit is further configured to control the first DC / DC converter to output a second direct current when the power generation power of the power generation unit is less than or equal to the required power of the target DC load, wherein the second direct current is used to charge the battery energy storage unit in the container energy storage system, and the voltage of the second direct current is greater than the voltage of the first direct current.

[0009] That is to say, when the power generation of the power generation unit cannot meet the power demand of the target DC load, the electric energy output by the power generation unit is used to charge the battery energy storage unit in the container energy storage system to ensure that the battery energy storage unit has sufficient power, so as to facilitate the frequency modulation and peak regulation of the auxiliary power supply. At this time, the first DC / DC converter can be controlled to output the second direct current to charge the battery energy storage unit, wherein the general battery energy storage unit includes a high-voltage energy storage battery, and the charging voltage of the high-voltage energy storage battery is generally 1200V-1800V, so the voltage of the second direct current is greater than the voltage of the first direct current. Therefore, even if the power generation of the power generation unit cannot meet the power demand of the target DC load, the electric energy output by the power generation unit can be fully utilized, thereby improving energy utilization and reducing energy loss.

[0010] In some embodiments, when the first DC / DC converter outputs the first direct current, if the power level of a UPS (Uninterruptible Power Supply) battery unit in the container energy storage system is less than or equal to a preset power threshold, the first direct current is also used to charge the UPS battery unit.

[0011] When the power generation of the power generation unit can meet the power demand of the target DC load, the power of the UPS battery unit is also obtained. If the power of the UPS battery unit is not full, the UPS battery unit can be charged by the first DC power to maximize the use of the power output of the power generation unit. On the other hand, when the UPS battery unit is always in a fully charged state, the target DC load can be maintained to work for a period of time when the power generation unit cannot generate power and the auxiliary power supply cannot supply power.

[0012] 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 is less than or equal to the required power of the target DC load.

[0013] When the power generated by the power generation unit cannot meet the power demand of the target DC load, the auxiliary power supply supplies power to the target DC load. Since the power provided by the auxiliary power supply is AC power, it needs to be converted into DC power before supplying power to the target DC load. Therefore, the AC power provided by the auxiliary power supply needs to be converted by the first AC / DC converter to output a third DC power to supply power to the target DC load, wherein the power supply voltage of the target DC load is generally 12V / 24V. Therefore, when the power generation unit cannot meet the demand, the auxiliary power supply supplies power so that the electrical equipment can work normally.

[0014] In some embodiments, the first power conversion unit further includes a first DC / AC converter, which is suitable for converting the direct current output by the power generation unit to output a first alternating current, wherein the control unit is further configured to control the first DC / AC converter to output the first alternating current to power the AC load when the power generation power of the power generation unit is greater than the sum of the required power of the target DC load and the required power of the AC load.

[0015] 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 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 target DC load, and to convert the DC power output by the power generation unit through the first DC / AC converter to output the first AC power to supply power to the AC load. In this way, the utilization rate of the power output by the power generation unit can be maximized, the abandoned light can be reduced, and the energy consumption of the auxiliary power supply can be reduced.

[0016] In other embodiments, the first power conversion unit further includes a first DC / AC converter, which is suitable for converting a fourth direct current output by the first DC / DC converter to output a first alternating current, wherein the control unit is further configured to control the first DC / AC converter to output the first alternating current to power the AC load when the power generation power of the power generation unit is greater than the sum of the required power of the target DC load and the required power of the AC load.

[0017] That is to say, the first DC / AC converter can be directly connected to the output end of the power generation unit to convert the direct current output by the power generation unit to output the first alternating current, and can also be directly connected to the first DC / DC converter to convert the fourth direct current output by the first DC / DC converter to output the first alternating current to power the AC load.

[0018] In some embodiments, the power supply output terminal of the auxiliary power supply is also connected to the AC load so as to compete with the first DC / AC converter to supply power to the AC load.

[0019] When the power generation power of the power generation unit cannot simultaneously meet the power requirements of the target DC load and the AC load, the auxiliary power supply competes with the first DC / AC converter to supply power to the AC load, that is, if the AC voltage provided by the auxiliary power supply is greater than the AC voltage output by the first DC / AC converter, the auxiliary power supply supplies power to the AC load; if the AC voltage provided by the auxiliary power supply is less than or equal to the AC voltage output by the first DC / AC converter, the AC load is supplied with power by the AC power output by the first DC / AC converter.

[0020] In a second aspect, an embodiment of the present application provides a power distribution method for a container energy storage system, wherein the container energy storage system comprises a first power conversion unit and a second power conversion 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 supply power to a target DC load in the container energy storage system, and the second power conversion unit is suitable for connecting to an auxiliary power supply and converting the power provided by the auxiliary power supply to supply power to the target DC load, wherein the supply voltage of the target DC load is less than a first preset voltage, and the method comprises: obtaining the power generation power of the power generation unit and the required power of the target DC load; and controlling the first power conversion unit and the second power conversion unit to switch to supply power to the target DC load according to the power generation power of the power generation unit and the required power of the target DC load.

[0021] In the technical solution of the embodiment of the present application, it is determined whether the target DC load is powered by the power generation unit or the target DC load is powered by the auxiliary power supply according to the power generation power of the power generation unit and the power demand of the target DC load (such as a low-voltage DC load). For example, when the power generation power of the power generation unit can meet the power demand of the target DC load, the target DC load is powered by the power generation unit, such as converting the electric energy output by the power generation unit into the DC voltage required by the target DC load through the first power conversion unit to power the target DC load. For another example, when the power generation power of the power generation unit cannot meet the power demand of the target DC load, the target DC load is powered by the auxiliary power supply, such as converting the electric energy output by the energy storage power supply into the DC voltage required by the target DC load through the second power conversion unit to power the target DC load, and the electric energy generated by the power generation unit can charge the battery in the container energy storage system, etc. Therefore, the power distribution method of the present application can use the electric energy generated by the power generation unit to power the DC load in the container energy storage system, reduce energy loss, improve energy utilization, reduce the power consumption of the auxiliary power supply, and in the absence of the auxiliary power supply, it can also achieve the black start of the container energy storage system.

[0022] 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 controlling the first power conversion unit and the second power conversion unit to switch to supply power to the target DC load according to the power generation power of the power generation unit and the power demand of the target DC load includes: when the power generation power of the power generation unit is greater than the power demand of the target DC load, controlling the first DC / DC converter to output the first direct current to supply power to the target DC load.

[0023] When the power generated by the power generation unit is greater than the power demand 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, the DC power output by the power generation unit needs to be converted by the first DC / DC converter to output the first DC power to power the target DC load, wherein the power supply voltage of the target DC load is generally 12V / 24V. In this way, the power of the power generation unit can be fully utilized, energy loss can be reduced, and the power consumption of the auxiliary power supply can also be reduced.

[0024] In some embodiments, controlling the first power conversion unit and the second power conversion unit to switch to supply power to the target DC load according to the power generation power of the power generation unit and the power demand of the target DC load includes: when the power generation power of the power generation unit is less than or equal to the power demand of the target DC load, controlling the first DC / DC converter to output a second direct current, wherein the second direct current is used to charge the battery energy storage unit in the container energy storage system, and the voltage of the second direct current is greater than the voltage of the first direct current.

[0025] When the power generation of the power generation unit cannot meet the power demand of the target DC load, the electric energy output by the power generation unit is used to charge the battery energy storage unit in the container energy storage system to ensure that the battery energy storage unit has sufficient power, so as to facilitate the frequency modulation and peak regulation of the auxiliary power supply. At this time, the first DC / DC converter can be controlled to output the second direct current to charge the battery energy storage unit, wherein the general battery energy storage unit includes a high-voltage energy storage battery, and the charging voltage of the high-voltage energy storage battery is generally 1200V-1800V, so the voltage of the second direct current is greater than the voltage of the first direct current. Therefore, even if the power generation of the power generation unit cannot meet the power demand of the target DC load, the electric energy output by the power generation unit can be fully utilized, thereby improving energy utilization and reducing energy loss.

[0026] In some embodiments, the second power conversion unit includes a first AC / DC converter, the first AC / DC converter is suitable for converting the electric energy provided by the auxiliary power supply to output a third direct current, and the controlling the first power conversion unit and the second power conversion unit to switch to supply power to the target DC load according to the power generation power of the power generation unit and the required power of the target DC load includes: when the power generation power of the power generation unit is less than or equal to the required power of the target DC load, controlling the first AC / DC converter to output the third direct current to supply power to the target DC load.

[0027] When the power generated by the power generation unit cannot meet the power demand of the target DC load, the auxiliary power supply supplies power to the target DC load. Since the power provided by the auxiliary power supply is AC power, it needs to be converted into DC power before supplying power to the target DC load. Therefore, the AC power provided by the auxiliary power supply needs to be converted by the first AC / DC converter to output a third DC power to supply power to the target DC load, wherein the power supply voltage of the target DC load is generally 12V / 24V. Therefore, when the power generation unit cannot meet the demand, the auxiliary power supply supplies power so that the electrical equipment can work normally.

[0028] In some embodiments, the first power conversion unit further includes a first DC / AC converter, the first DC / AC converter being suitable for converting the direct current output by the power generation unit to output a first alternating current, and the controlling the first power conversion unit and the second power conversion unit to switch to supply power to the target DC load according to the power generation power of the power generation unit and the required power of the target DC load comprises: when the power generation power of the power generation unit is greater than 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 supply power to the AC load.

[0029] 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 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 target DC load, and to convert the DC power output by the power generation unit through the first DC / AC converter to output the first AC power to supply power to the AC load. In this way, the utilization rate of the power output by the power generation unit can be maximized, the abandoned light can be reduced, and the energy consumption of the auxiliary power supply can be reduced.

[0030] In some other embodiments, the first power conversion unit further includes a first DC / AC converter, the first DC / AC converter being suitable for converting a fourth direct current output by the first DC / DC converter to output a first alternating current, and controlling the first power conversion unit and the second power conversion unit to switch to supply power to the target DC load according to the power generation power of the power generation unit and the power demand of the target DC load, including: when the power generation power of the power generation unit is greater than the sum of the power demand of the target DC load and the power demand of the AC load, controlling the first DC / AC converter to output the first alternating current to supply power to the AC load.

[0031] The first DC / AC converter can be directly connected to the output end of the power generation unit to convert the direct current output by the power generation unit to output the first alternating current. It can also be directly connected to the first DC / DC converter to convert the fourth direct current output by the first DC / DC converter to output the first alternating current to power the AC load.

[0032] 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.

[0033] In some embodiments, the power generation unit includes at least one of a photovoltaic power generation component and a wind power generation component.

[0034] 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

[0035] 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:

[0036] Figure 1 is a block diagram of a power distribution device of a container energy storage system according to some embodiments;

[0037] Figure 2 is a schematic diagram of a power distribution device of a container energy storage system according to some embodiments;

[0038] Figure 3 is a schematic diagram of a power distribution device of a container energy storage system according to some embodiments;

[0039] Figure 4 is a schematic diagram of the position of photovoltaic components according to some embodiments;

[0040] Figure 5 is a schematic diagram of a power distribution method of a container energy storage system according to some embodiments;

[0041] Figure 6 is a flow chart of a power distribution method for a container energy storage system according to some embodiments;

[0042] Figure 7 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] Therefore, in an embodiment of the present application, the first power conversion unit and the second power conversion unit are switched according to the power generation power of the power generation unit and the required power of the target DC load, and one of them is selected to power the target DC load. The electric energy generated by the power generation unit is used to power the DC load in the container energy storage system instead of being incorporated into the power grid, 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, a black start of the container energy storage system can be achieved.

[0053] 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.

[0054] Reference Figure 1-Figure 3 As shown, the power distribution device of the container energy storage system in the embodiment of the present application may include a first power conversion unit 10 , a second power conversion unit 20 and a control unit 30 .

[0055] Among them, 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 target DC load in the container energy storage system, wherein the power supply voltage of the target DC load is less than the first preset voltage. The second power conversion unit 20 is suitable for connecting to the auxiliary power supply and converting the power provided by the auxiliary power supply to supply power to the target DC load. The control unit 30 is configured to control the first power conversion unit 10 and the second power conversion unit 20 to switch to supply power to the target DC load according to the power generation power of the power generation unit and the required power of the target DC load. The first preset voltage can be calibrated according to actual conditions, for example, the first preset voltage is 12V or 24V.

[0056] 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 power demand of the target DC load in real time. According to the power generation power of the power generation unit and the power demand of the target DC load (such as a low-voltage DC load, the low-voltage DC load includes relays, circuit breakers, etc.), it is determined whether the target DC load is powered by the power generation unit or the target DC load is powered by the auxiliary power supply. For example, when the power generation power of the power generation unit can meet the power demand of the target DC load, the target DC load is powered by the power generation unit, such as converting the electric energy output by the power generation unit into the DC voltage required by the target DC load through the first power conversion unit to power the target DC load. For another example, when the power generation of the power generation unit cannot meet the power demand of the target DC load, the target DC load is powered by the auxiliary power supply, such as converting the power output of the energy storage power supply into the DC voltage required by the target DC load through the second power conversion unit to power the target DC load, and the power generated by the power generation unit can charge the battery in the container energy storage system. Therefore, the power distribution device of the present application uses the power generated by the power generation unit to power the DC load in the container energy storage system without being connected to the power grid, 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.

[0057] In some embodiments, Figure 2 and 3As shown, the first power conversion unit 10 may include 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 30 is also configured to control the first DC / DC converter 11 to output the first direct current to supply power to the target DC load when the power generation power of the power generation unit is greater than the required power of the target DC load.

[0058] Specifically, when the power generated by the power generation unit is greater than the power demand 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, the DC power output by the power generation unit needs to be converted by the first DC / DC converter 11 to output the first DC power to power the target DC load, wherein the power supply voltage of the target DC load is generally 12V / 24V. In this way, the power of the power generation unit can be fully utilized, energy loss can be reduced, and the power consumption of the auxiliary power supply can also be reduced.

[0059] 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.

[0060] In some embodiments, the control unit is further configured to control the first DC / DC converter to output a second direct current when the power generation power of the power generation unit is less than or equal to the required power of the target DC load, wherein the second direct current is used to charge the battery energy storage unit in the container energy storage system, and the voltage of the second direct current is greater than the voltage of the first direct current. The voltage of the second direct current may be 1200V-1800V.

[0061] That is to say, when the power generation of the power generation unit cannot meet the power demand of the target DC load, the electric energy output by the power generation unit is used to charge the battery energy storage unit 110 in the container energy storage system, so that the battery energy storage unit 110 has sufficient power, which is convenient for frequency modulation and peak regulation of the auxiliary power supply. At this time, the control unit 30 can control the first DC / DC converter 11 to output the second direct current to charge the battery energy storage unit 110, wherein the general battery energy storage unit includes a high-voltage energy storage battery, and the charging voltage of the high-voltage energy storage battery is generally 1200V-1800V, so the voltage of the second direct current is greater than the voltage of the first direct current. Therefore, even if the power generation of the power generation unit cannot meet the power demand of the target DC load, the electric energy output by the power generation unit can be fully utilized, which improves energy utilization and reduces energy loss.

[0062] In some embodiments, when the first DC / DC converter 11 outputs the first direct current, if the power level of the UPS battery unit 120 in the container energy storage system is less than or equal to a preset power threshold, the first direct current is also used to charge the UPS battery unit. The preset power threshold can be calibrated according to actual conditions, for example, the preset power threshold can be 100%.

[0063] Specifically, when the power generated by the power generation unit can meet the power demand of the target DC load, the power of the UPS battery unit 120 is also obtained. If the power of the UPS battery unit 120 is not full, the UPS battery unit 120 can be charged by the first DC power output by the first DC / DC converter 11, so as to maximize the use of the power output by the power generation unit. On the other hand, when the UPS battery unit is always in a fully charged state, the target DC load can be maintained to work for a period of time when the power generation unit cannot generate power and the auxiliary power supply cannot supply power.

[0064] In some embodiments, Figure 2 and 3 As shown, the second power conversion unit 20 includes a first AC / DC converter 21, which is suitable for converting the electric energy provided by the auxiliary power supply to output a third direct current, wherein the control unit 30 is further configured to control the first AC / DC converter 21 to output the third direct current to supply power to the target DC load when the power generation power of the power generation unit is less than or equal to the required power of the target DC load.

[0065] Specifically, when the power generation of the power generation unit cannot meet the power demand of the target DC load, the auxiliary power supply supplies power to the target DC load. Since the power provided by the auxiliary power supply is AC power, it needs to be converted into DC power before supplying power to the target DC load. Therefore, the control unit 30 needs to convert the AC power provided by the auxiliary power supply through the first AC / DC converter 21 to output a third DC power to supply power to the target DC load, wherein the power supply voltage of the target DC load is generally 12V / 24V. Therefore, when the power generation unit cannot meet the demand, the auxiliary power supply is used to supply power so that the electrical equipment can work normally.

[0066] In some embodiments, Figure 2 As shown, the first power conversion unit 10 also includes a first DC / AC converter 12, which is suitable for converting the direct current output by the power generation unit to output a first alternating current, wherein the control unit 30 is also configured to control the first DC / AC converter 12 to output the first alternating current to power the AC load when the power generation power of the power generation unit is greater than the sum of the required power of the target DC load and the required power of the AC load.

[0067] Specifically, when the power generation power of the power generation unit can simultaneously meet the power requirements of the target DC load and the AC load (for example, a water cooling unit, etc.), 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 DC power output by the power generation unit through the first DC / DC converter 11 to output the first DC power to supply power to the target DC load, and to convert the DC power output by the power generation unit through the first DC / AC converter 12 to output the first AC power to supply power to the AC load. In this way, the utilization rate of the power output by the power generation unit can be maximized, the abandoned light can be reduced, and the energy consumption of the auxiliary power supply can be reduced.

[0068] In other embodiments, Figure 3 As shown, the first power conversion unit 10 also includes a first DC / AC converter 12, which is suitable for converting the fourth direct current output by the first DC / DC converter 11 to output a first alternating current, wherein the control unit 30 is further configured to control the first DC / AC converter 12 to output the first alternating current to power the AC load when the power generation power of the power generation unit is greater than the sum of the required power of the target DC load and the required power of the AC load.

[0069] That is to say, the first DC / AC converter 12 can be directly connected to the output end of the power generation unit to convert the direct current output by the power generation unit to output the first alternating current, and can also be directly connected to the first DC / DC converter 11 to convert the fourth direct current output by the first DC / DC converter 11 to output the first alternating current to power the AC load.

[0070] In some embodiments, the power supply output terminal of the auxiliary power supply is also connected to an AC load, so as to compete with the first DC / AC converter to supply power to the AC load.

[0071] Specifically, when the power generation power of the power generation unit cannot simultaneously meet the power requirements of the target DC load and the AC load, the auxiliary power supply competes with the first DC / AC converter 12 to supply power to the AC load. That is, if the AC voltage provided by the auxiliary power supply is greater than the AC voltage output by the first DC / AC converter 12, the auxiliary power supply supplies power to the AC load; if the AC voltage provided by the auxiliary power supply is less than or equal to the AC voltage output by the first DC / AC converter 12, the AC power output by the first DC / AC converter 12 supplies power to the AC load, so that the electrical equipment in the container energy storage system can operate normally.

[0072] As a specific example, a power generation unit including a photovoltaic module is taken as an example for explanation.

[0073] In common photovoltaic energy storage power stations, photovoltaic modules and container energy storage systems are placed separately in different areas, occupying a huge area. In order to solve the problem of large floor space, this application integrates photovoltaic modules and energy storage containers into a physical setting, and prevents photovoltaic modules from being placed on the top of the container through brackets, such as Figure 4 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 slope design structure, which can reduce the risk of water and snow accumulation on the top. Placing the photovoltaic module on the energy storage container can not only reduce the use of the occupied area, but also the top of the energy storage container is affected by the solar radiation. Due to the difference in the three-dimensional temperature field, the temperature of the top is about 2°C higher than the temperature of other parts on average. After placing the photovoltaic circuit board on the top, it can absorb the heat of solar radiation, prevent the sun from directly shining on 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.

[0074] 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.

[0075] The photovoltaic module is used as one of the energy sources of the container energy storage system. The electric energy generated by the photovoltaic module is converted by the first DC / DC converter and then supplies power to the DC load (target DC load). When the photovoltaic module supplies power to the DC load, it can also supply power to the UPS battery. 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] like Figure 5 As shown, the energy storage system is powered on for self-test, and the control unit determines whether the power generation power of the photovoltaic module is greater than the required power of the DC load. If not, the photovoltaic module supplies power to the battery energy storage unit through the first DC / DC converter, and does not supply power to the low-voltage load; if it is greater, only the photovoltaic module supplies power to the DC load through the first DC / DC converter. At this time, it is determined whether the power of the UPS battery unit is 100%. If not, the charging MOS tube of the UPS battery unit is closed, and the photovoltaic module charges the UPS battery unit through the first DC / DC converter. When the photovoltaic module supplies power to the DC load through the first DC / DC converter, if the light intensity>1000W / m 2When the ambient temperature is greater than 25°C, the photovoltaic modules are controlled to be spread out, the relay of the first DC / AC converter is closed, and the auxiliary power supply and the AC power output by the first DC / AC converter compete to supply power to the AC load.

[0080] To summarize, in the technical solution of the 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 target DC load in the container energy storage system, and the second power conversion unit converts the electric energy provided by the auxiliary power supply to supply power to the target DC load. The control unit controls the first power conversion unit and the second power conversion unit to switch to supply power to the target DC load according to the power generation power of the power generation unit and the required power of the target DC load, and supplies power to the DC load in the container energy storage system with the electric energy generated by the power generation unit, thereby reducing energy loss, improving energy utilization, reducing power consumption of the auxiliary power supply, and realizing black start of the container energy storage system in the absence of an auxiliary power supply.

[0081] Corresponding to the above embodiment, the embodiment of the present application further proposes a power distribution method for a container energy storage system.

[0082] In some embodiments, the container energy storage system may include a first power conversion unit and a second power conversion unit, 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 a target DC load in the container energy storage system, and the second power conversion unit is suitable for connecting to an auxiliary power supply and converting the power provided by the auxiliary power supply to power the target DC load, wherein the power supply voltage of the target DC load is less than a first preset voltage.

[0083] like Figure 6 As shown, the power distribution method of the container energy storage system in the embodiment of the present application may include the following steps:

[0084] S1, obtaining the power generation power of the power generation unit and the required power of the target DC load.

[0085] S2, controlling the first power conversion unit and the second power conversion unit to switch to supply power to the target DC load according to the power generation power of the power generation unit and the power demand of the target DC load.

[0086] 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. According to the power generation power of the power generation unit and the required power of the target DC load (such as a low-voltage DC load, the low-voltage DC load includes relays, circuit breakers, etc.), it is determined whether the target DC load is powered by the power generation unit or the target DC load is powered by an auxiliary power supply. For example, when the power generation power of the power generation unit can meet the required power of the target DC load, the target DC load is powered by the power generation unit, such as by converting the electric energy output by the power generation unit into the DC voltage required by the target DC load through the first power conversion unit to power the target DC load. For another example, when the power generation of the power generation unit cannot meet the power demand of the target DC load, the target DC load is powered by the auxiliary power supply, such as converting the power output of the energy storage power supply into the DC voltage required by the target DC load through the second power conversion unit to power the target DC load, and the power generated by the power generation unit can charge the battery in the container energy storage system. Therefore, the power distribution device of the present application uses the power generated by the power generation unit to power the DC load in the container energy storage system without being connected to the power grid, 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.

[0087] 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 and the second power conversion unit to switch to supply power to the target DC load according to the power generation power of the power generation unit and the required power of the target DC load, including: when the power generation power of the power generation unit is greater than the required power of the target DC load, controlling the first DC / DC converter to output the first direct current to supply power to the target DC load.

[0088] Specifically, when the power generated by the power generation unit is greater than the power demand 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, the DC power output by the power generation unit needs to be converted by the first DC / DC converter to output the first DC power to power the target DC load, wherein the power supply voltage of the target DC load is generally 12V / 24V. In this way, the power of the power generation unit can be fully utilized, energy loss can be reduced, and the power consumption of the auxiliary power supply can also be reduced.

[0089] In some embodiments, the first power conversion unit and the second power conversion unit are controlled to switch to supply power to the target DC load according to the power generation power of the power generation unit and the power demand of the target DC load, including: when the power generation power of the power generation unit is less than or equal to the power demand of the target DC load, the first DC / DC converter is controlled to output the second direct current, wherein the second direct current is used to charge the battery energy storage unit in the container energy storage system, and the voltage of the second direct current is greater than the voltage of the first direct current.

[0090] That is to say, when the power generation of the power generation unit cannot meet the power demand of the target DC load, the electric energy output by the power generation unit is used to charge the battery energy storage unit in the container energy storage system, so that the battery energy storage unit has sufficient power, which is convenient for frequency modulation and peak regulation of the auxiliary power supply. At this time, the first DC / DC converter can be controlled to output the second direct current to charge the battery energy storage unit, wherein the general battery energy storage unit includes a high-voltage energy storage battery, and the charging voltage of the high-voltage energy storage battery is generally 1200V-1800V, so the voltage of the second direct current is greater than the voltage of the first direct current. Therefore, even if the power generation of the power generation unit cannot meet the power demand of the target DC load, the electric energy output by the power generation unit can be fully utilized, which improves energy utilization and reduces energy loss.

[0091] In some embodiments, the power distribution method further includes: when the first DC / DC converter outputs the first direct current, if the power level of the UPS battery unit in the container energy storage system is less than or equal to a preset power threshold, the first direct current is also used to charge the UPS battery unit. The preset power threshold can be calibrated according to actual conditions, for example, the preset power threshold can be 100%.

[0092] Specifically, when the power generated by the power generation unit can meet the power demand of the target DC load, the power of the UPS battery unit is also obtained. If the power of the UPS battery unit is not full, the UPS battery unit can be charged by the first DC power output by the first DC / DC converter to maximize the use of the power output by the power generation unit. On the other hand, when the UPS battery unit is always in a fully charged state, the target DC load can be maintained to work for a period of time when the power generation unit cannot generate electrical energy and the auxiliary power supply cannot supply power.

[0093] 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. The first power conversion unit and the second power conversion unit are controlled to switch to supply power to the target DC load according to the power generation power of the power generation unit and the required power of the target DC load, including: when the power generation power of the power generation unit is less than or equal to the required power of the target DC load, the first AC / DC converter is controlled to output the third direct current to supply power to the target DC load.

[0094] Specifically, when the power generated by the power generation unit cannot meet the power demand of the target DC load, the auxiliary power supply supplies power to the target DC load. Since the power provided by the auxiliary power supply is AC power, it needs to be converted into DC power before supplying power to the target DC load. Therefore, the AC power provided by the auxiliary power supply needs to be converted by the first AC / DC converter to output a third DC power to supply power to the target DC load, wherein the power supply voltage of the target DC load is generally 12V / 24V. Therefore, when the power generation unit cannot meet the demand, the auxiliary power supply supplies power so that the electrical equipment can work normally.

[0095] In some embodiments, the first power conversion unit also includes a first DC / AC converter, which is suitable for converting the direct current output by the power generation unit to output a first alternating current, and controlling the first power conversion unit and the second power conversion unit to switch to supply power to the target DC load according to the power generation power of the power generation unit and the required power of the target DC load, including: when the power generation power of the power generation unit is greater than 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 supply power to the AC load.

[0096] 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 DC power output by the power generation unit through a first DC / DC converter to output a first DC power to supply power to the target DC load, and to convert the DC power output by the power generation unit through a first DC / AC converter to output a first AC power to supply power to the AC load. This can maximize the utilization rate of the power output by the power generation unit, reduce abandoned light, and reduce the energy consumption of the auxiliary power supply.

[0097] In other embodiments, the first power conversion unit also includes a first DC / AC converter, which is suitable for converting the fourth direct current output by the first DC / DC converter to output a first alternating current, and controlling the first power conversion unit and the second power conversion unit to switch to supply power to the target DC load according to the power generation power of the power generation unit and the required power of the target DC load, including: when the power generation power of the power generation unit is greater than 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 supply power to the AC load.

[0098] That is to say, the first DC / AC converter can be directly connected to the output end of the power generation unit to convert the direct current output by the power generation unit to output the first alternating current, and can also be directly connected to the first DC / DC converter to convert the fourth direct current output by the first DC / DC converter to output the first alternating current to power the AC load.

[0099] In some embodiments, the power supply output terminal of the auxiliary power supply is also connected to an AC load, so as to compete with the first DC / AC converter to supply power to the AC load.

[0100] Specifically, when the power generation power of the power generation unit cannot simultaneously meet the power requirements of the target DC load and the AC load, the auxiliary power supply competes with the first DC / AC converter to supply power to the AC load, that is, if the AC voltage provided by the auxiliary power supply is greater than the AC voltage output by the first DC / AC converter, the auxiliary power supply supplies power to the AC load; if the AC voltage provided by the auxiliary power supply is less than or equal to the AC voltage output by the first DC / AC converter, the AC power output by the first DC / AC converter supplies power to the AC load, so that the electrical equipment in the container energy storage system can operate normally.

[0101] 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 application, please refer to the details disclosed in the power distribution device of the container energy storage system in the embodiment of the present application, and the details will not be repeated here.

[0102] In summary, the power supply method of the container energy storage system in some embodiments of the present application obtains the power generation power of the power generation unit and the required power of the target DC load, and controls the first power conversion unit and the second power conversion unit to switch to supply power to the target DC load according to the power generation power of the power generation unit and the required power of the target DC load. As a result, the power distribution method can use the electric energy generated by the power generation unit to supply power to the DC load in the container energy storage system without being incorporated into the power grid, thereby reducing energy loss, improving energy utilization, reducing the power consumption of the auxiliary power supply, and realizing the black start of the container energy storage system without the auxiliary power supply.

[0103] Corresponding to the above embodiments, the present application also proposes a container energy storage system.

[0104] like Figure 7 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.

[0105] 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.

[0106] 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 distribution device of the container energy storage system of some embodiments of the present application, and the details will not be repeated here.

[0107] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; 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 specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments 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 to convert electric energy output by the power generation unit to supply power to a target DC load in the container energy storage system, wherein a supply voltage of the target DC load is less than a first preset voltage; 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 configured to control the first power conversion unit and the second power conversion unit to switch to supply power to the target DC load according to the power generation power of the power generation unit and the required power of the target DC load.

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: When the power generated by the power generation unit is greater than the required power of the target DC load, the first DC / DC converter is controlled to output the first DC power to supply power to the target DC load.

3. The power distribution device according to claim 2, characterized in that: The control unit is further configured to control the first DC / DC converter to output a second direct current when the power generation power of the power generation unit is less than or equal to the required power of the target DC load, wherein the second direct current is used to charge the battery energy storage unit in the container energy storage system, and the voltage of the second direct current is greater than the voltage of the first direct current.

4. The power distribution device according to claim 2, characterized in that: When the first DC / DC converter outputs the first direct current, if the power level of a UPS battery unit in the container energy storage system is less than or equal to a preset power threshold, the first direct current is also used to charge the UPS battery unit.

5. The power distribution device according to claim 2, 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 generation power of the power generation unit is less than or equal to the required power 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.

6. The power distribution device according to claim 2, characterized in that: The first power conversion unit further includes a first DC / AC converter, which is suitable for converting the direct current output by the power generation unit to output a first alternating current, wherein the control unit is further configured to: When the power generation power of the power generation unit is greater than the sum of the required power of the target DC load and the required power of the AC load, the first DC / AC converter is controlled to output the first AC power to supply power to the AC load.

7. The power distribution device according to claim 2, 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 a fourth direct current output by the first DC / DC converter to output a first alternating current, wherein the control unit is further configured to: When the power generation power of the power generation unit is greater than the sum of the required power of the target DC load and the required power of the AC load, the first DC / AC converter is controlled to output the first AC power to supply power to the AC load.

8. The power distribution device according to claim 6 or 7, characterized in that: The power supply output terminal of the auxiliary power supply is also connected to the AC load so as to compete with the first DC / AC converter to supply power to the AC load.

9. A power distribution method for a container energy storage system, characterized in that: The container energy storage system includes a first power conversion unit and a second power conversion 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 a target DC load in the container energy storage system, and the second power conversion unit 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, wherein the power supply voltage of the target DC load is less than a first preset voltage, and the method includes: Acquiring the power generation of the power generation unit and the required power of the target DC load; The first power conversion unit and the second power conversion unit are controlled to switch to supply power to the target DC load according to the power generation power of the power generation unit and the power demand of the target DC load.

10. The power distribution method according to claim 9, characterized in that: 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 the first direct current, and the first power conversion unit and the second power conversion unit are controlled to switch to supply power to the target direct current load according to the power generation power of the power generation unit and the required power of the target direct current load, including: When the power generated by the power generation unit is greater than the required power of the target DC load, the first DC / DC converter is controlled to output the first DC power to supply power to the target DC load.

11. The power distribution method according to claim 10, characterized in that: The controlling the first power conversion unit and the second power conversion unit to switch to supply power to the target DC load according to the power generation power of the power generation unit and the power demand of the target DC load comprises: When the power generation power of the power generation unit is less than or equal to the required power of the target DC load, the first DC / DC converter is controlled to output a second DC power, wherein the second DC power is used to charge the battery energy storage unit in the container energy storage system, and the voltage of the second DC power is greater than the voltage of the first DC power.

12. The power distribution method according to claim 10, characterized in that: The second power conversion unit includes a first AC / DC converter, the first AC / DC converter is suitable for converting the power provided by the auxiliary power supply to output a third direct current, and the first power conversion unit and the second power conversion unit are controlled to switch to supply power to the target DC load according to the power generation power of the power generation unit and the required power of the target DC load, including: When the power generation power of the power generation unit is less than or equal to the required power 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.

13. The power distribution method according to claim 10, characterized in that: The first power conversion unit further includes a first DC / AC converter, the first DC / AC converter is adapted to convert the direct current output by the power generation unit to output a first alternating current, and the first power conversion unit and the second power conversion unit are controlled to switch to supply power to the target DC load according to the power generation power of the power generation unit and the required power of the target DC load, comprising: When the power generation power of the power generation unit is greater than the sum of the required power of the target DC load and the required power of the AC load, the first DC / AC converter is controlled to output the first AC power to supply power to the AC load.

14. The power distribution method according to claim 10, characterized in that: The first power conversion unit further includes a first DC / AC converter, the first DC / AC converter is adapted to convert the fourth direct current output by the first DC / DC converter to output the first alternating current, and the first power conversion unit and the second power conversion unit are controlled to switch to supply power to the target DC load according to the power generation power of the power generation unit and the power demand of the target DC load, including: When the power generation power of the power generation unit is greater than the sum of the required power of the target DC load and the required power of the AC load, the first DC / AC converter is controlled to output the first AC power to supply power to the AC load.

15. 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 8.

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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