Power supply circuit and power supply control method for high-voltage energy storage system

Abstract

The present disclosure discloses a power supply circuit and a power supply control method for a high-voltage energy storage system. The power supply circuit comprises a first power supply circuit and a second power supply circuit, configured to output direct current to a load of an energy storage submodule; output terminals of the first power supply circuit and the second power supply circuit are both connected to the load of the energy storage submodule; an input terminal of the first power supply circuit is configured to draw power from within the high-voltage energy storage system; the second power supply circuit comprises a photovoltaic branch, the photovoltaic branch is configured to be equipotentially connected with the energy storage submodule, and an input terminal of the second power supply circuit is configured to input direct current from the photovoltaic branch. In this way, redundant power supply design can be realized through by means of a first power supply circuit and a second power supply circuit. When an abnormality occurs in the first power supply circuit, a load can be powered by means of the photovoltaic branch in the second power supply circuit, thereby ensuring uninterrupted power supply to the high-voltage energy storage system, and further improving the reliability of redundant power supply.

Description

Power supply circuit and power supply control method of high voltage energy storage system

[0001] Cross-reference to related applications

[0002] This disclosure is based on and claims priority to Chinese Patent Application No. 202411217093.3, filed on August 30, 2024, entitled "Power Supply Circuit and Power Supply Control Method for High Voltage Energy Storage System", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of power electronics technology, and in particular to a power supply circuit and power supply control method for a high-voltage energy storage system. Background Technology

[0004] With the transformation of the global energy structure and the rapid development of renewable energy, energy storage systems are playing an increasingly prominent role in the power system. Among them, cascaded high-voltage energy storage systems, as a representative of new energy storage technologies, are gradually becoming an important choice for large-scale energy storage applications due to their advantages such as low cost, high efficiency, and high security.

[0005] In related technologies, cascaded high-voltage energy storage systems are typically powered by cross-charging of power from adjacent power modules. This approach allows adjacent modules to provide power support in the event of a failure in one power module, ensuring the overall stable operation of the system. However, this power supply method still has shortcomings, failing to meet high reliability requirements and resulting in poor power supply reliability. Summary of the Invention

[0006] This disclosure proposes a power supply circuit and power supply control method for a high-voltage energy storage system, which can ensure uninterrupted power supply to the high-voltage energy storage system, thereby improving the reliability of power supply.

[0007] The technical solution disclosed herein is implemented as follows:

[0008] In a first aspect, embodiments of this disclosure provide a power supply circuit for a high-voltage energy storage system. The power supply circuit includes a first power supply circuit and a second power supply circuit, configured to output direct current to the load of the energy storage submodule.

[0009] The output terminals of both the first and second power supply circuits are connected to the load of the energy storage submodule.

[0010] The input of the first power supply circuit is configured to draw power from the high-voltage energy storage system.

[0011] The second power supply circuit includes a photovoltaic branch, which is configured to be equipotentially connected to the energy storage submodule, and the input terminal of the second power supply circuit is configured to receive DC power from the photovoltaic branch.

[0012] Through the aforementioned technical means, the output terminal of the first power supply circuit is connected to the load of the energy storage submodule, and the input terminal of the first power supply circuit is configured to draw power from the high-voltage energy storage system. In this case, DC power can be supplied to the load of the energy storage submodule after drawing power from the high-voltage energy storage system via the first power supply circuit. The output terminal of the second power supply circuit is connected to the load of the energy storage submodule, and the input terminal of the second power supply circuit is configured to receive DC power from the photovoltaic branch. In this case, DC power can be supplied to the load of the energy storage submodule after drawing power from the photovoltaic branch via the first and second power supply circuits. Thus, power can be supplied to the load by drawing power from either the high-voltage energy storage system or the photovoltaic branch through the first and second power supply circuits, thereby achieving a redundant power supply design. For example, when the first power supply circuit is functioning normally, power can be drawn from the high-voltage energy storage system to supply power to the load; when the first power supply circuit malfunctions, power can be supplied to the load by drawing power from the photovoltaic branch through the second power supply circuit, thereby ensuring uninterrupted power supply to the high-voltage energy storage system and improving power supply reliability. In addition, since the photovoltaic branch and the energy storage submodule are connected at the same potential, the potential of the photovoltaic branch is equivalent to that of the energy storage submodule. Therefore, when power is drawn from the photovoltaic branch to supply power to the load of the energy storage submodule, high-voltage isolation is no longer required. This reduces equipment failures such as discharge and breakdown caused by high voltage difference, thereby reducing the cost of power supply and improving the safety of power supply.

[0013] In some embodiments, the second power supply circuit further includes a power supply battery branch configured to be equipotentially connected to the energy storage submodule, and the input terminal of the second power supply circuit is further configured to input DC power from the power supply battery branch.

[0014] Through the aforementioned technical means, the input terminal of the second power supply circuit is configured to receive DC power from the power supply battery branch. In this case, DC power can be supplied to the load of the energy storage submodule by drawing power from the power supply battery branch through the second power supply circuit. This allows for uninterrupted power supply to the high-voltage energy storage system using the first power supply circuit, the photovoltaic branch, and the power supply battery branch, improving power supply reliability. Furthermore, since the power supply battery branch and the energy storage submodule are connected at the same potential, their potentials are comparable. Therefore, when supplying power to the load of the energy storage submodule through the power supply battery branch, high-voltage isolation is no longer required, reducing equipment failures such as discharge and breakdown caused by high voltage differences. This also reduces power supply costs and improves power supply safety.

[0015] In some embodiments, the photovoltaic branch includes a first photovoltaic branch; the first photovoltaic branch includes a first photovoltaic unit and a first voltage conversion unit, the first voltage conversion unit being configured to convert the direct current output by the first photovoltaic unit into a first electrical power and output it.

[0016] Through the above-mentioned technical means, the DC power output by the first photovoltaic unit is converted into the first electrical power by the first voltage conversion unit. At this time, when the second power supply circuit draws power from the first photovoltaic branch and supplies power to the load of the energy storage submodule, it can meet the electrical power requirements of the load of the energy storage submodule, so as to maintain the normal operation of the load of the energy storage submodule and improve the safety of power supply.

[0017] In some embodiments, the power supply circuit further includes a first power supply management unit, a second power supply management unit, and a third power supply management unit; wherein the first power supply management unit is connected between the output terminal of the first power supply circuit and the load of the energy storage submodule; the second power supply management unit is connected between the output terminal of the first photovoltaic branch and the load of the energy storage submodule; and the third power supply management unit is connected between the output terminal of the power supply battery branch and the load of the energy storage submodule.

[0018] Through the aforementioned technical means, since the first power supply management unit is connected between the first power supply circuit and the load of the energy storage submodule, the second power supply management unit is connected between the first photovoltaic branch and the load of the energy storage submodule, and the third power supply management unit is connected between the power supply battery branch and the load of the energy storage submodule, the power supply management units can manage the power supply of each power supply branch (such as the first power supply circuit, the first photovoltaic branch, and the power supply battery branch), ensuring uninterrupted power supply to the high-voltage energy storage system and thus improving the reliability of power supply.

[0019] In some embodiments, the power supply circuit further includes a fourth power supply management unit; wherein one end of the fourth power supply management unit is connected between the output terminal of the first photovoltaic branch and the input terminal of the second power supply management unit; and the other end of the fourth power supply management unit is connected between the output terminal of the power supply battery branch and the input terminal of the third power supply management unit.

[0020] Through the above-mentioned technical means, one end of the fourth power supply management unit is connected between the first photovoltaic branch and the second power supply management unit, and the other end of the fourth power supply management unit is connected between the power supply battery branch and the third power supply management unit. At this time, when the second power supply circuit draws power from the first photovoltaic branch, it can supply power to the power supply battery branch through the fourth power supply management unit, thereby improving the utilization rate of the power supply circuit and enabling the power supply battery branch to provide sufficient DC power to the load of the energy storage system, thus improving the reliability of power supply.

[0021] In some embodiments, the photovoltaic branch further includes a second photovoltaic branch; wherein the output of the second photovoltaic branch is connected between the power supply battery branch and the load of the energy storage submodule, and is configured to provide DC power to the power supply battery branch and / or the load of the energy storage submodule.

[0022] Through the aforementioned technical means, the output terminal of the second photovoltaic branch is connected between the power supply battery branch and the load of the energy storage submodule. In this case, DC power can be supplied to the power supply battery branch by drawing power from the second photovoltaic branch via the second power supply circuit; alternatively, DC power can be supplied to the load of the energy storage submodule via the second power supply circuit; or, DC power can be supplied to the power supply battery branch and / or the load of the energy storage submodule via the second power supply circuit. Thus, when power is drawn from the second photovoltaic branch to supply power to the power supply battery branch, and when power is drawn from the power supply battery branch to supply power to the load of the energy storage submodule, continuous discharge of the power supply battery branch leading to over-discharge will not occur, improving power supply safety. Furthermore, supplying power to the load of the energy storage submodule via the second photovoltaic branch also improves the utilization rate of the second photovoltaic branch.

[0023] In some embodiments, the second photovoltaic branch includes a second photovoltaic unit and a second voltage conversion unit, the second voltage conversion unit being configured to convert the direct current output by the second photovoltaic unit into a second electrical power and output it.

[0024] Through the aforementioned technical means, the DC power output from the second photovoltaic unit is converted into electrical power by the second voltage conversion unit. When power is drawn from the second photovoltaic branch and supplied to the load of the energy storage submodule through the second power supply circuit, the electrical power requirements of the energy storage submodule load can be met, thereby maintaining the normal operation of the energy storage submodule load and improving the safety of power supply. Alternatively, power can be drawn from the second photovoltaic branch to supply power to the power supply battery branch. When power is drawn from the power supply battery branch to supply power to the load of the energy storage submodule, it will not cause the power supply battery branch to continuously discharge and cause over-discharge, thus improving the safety of power supply.

[0025] In some embodiments, the second photovoltaic branch includes a second photovoltaic unit and a second voltage conversion unit, the second voltage conversion unit being configured to convert the direct current output by the second photovoltaic unit into a second electrical power and output it.

[0026] Through the above-mentioned technical means, the DC power output by the second photovoltaic unit is converted into the second electrical power by the second voltage conversion unit. At this time, when the second power supply circuit draws power from the first photovoltaic branch and supplies power to the load of the power supply battery branch and / or energy storage submodule, it can meet the power demand of the power supply battery branch and / or energy storage submodule, ensure uninterrupted power supply to the high-voltage energy storage system, and thus improve the reliability of power supply.

[0027] In some embodiments, the power supply circuit further includes a fifth power supply management unit; wherein the input terminal of the fifth power supply management unit is connected to the output terminal of the second photovoltaic branch; and the output terminal of the fifth power supply management unit is connected between the output terminal of the power supply battery branch and the input terminal of the third power supply management unit.

[0028] Through the above technical means, since the input terminal of the fifth power supply management unit is connected to the output terminal of the second photovoltaic branch; and the output terminal of the fifth power supply management unit is connected between the output terminal of the power supply battery branch and the input terminal of the third power supply management unit, when the second power supply circuit draws power from the second photovoltaic branch, it can control the power supply battery branch and / or the load of the energy storage submodule through the fifth power supply management unit to improve the safety of power supply.

[0029] In some embodiments, at least one of the first power supply management unit, the second power supply management unit, and the third power supply management unit includes an anti-backflow unit; or, it includes a switch unit and an anti-backflow unit, wherein the switch unit and the anti-backflow unit are connected in series.

[0030] Through the aforementioned technical means, the backflow prevention unit in the power supply management unit can prevent current backflow and improve the safety of the power supply circuit. In addition, the power supply management unit may also include a switching unit, which can perform power supply priority control on each power supply branch, thereby improving the reliability of the power supply.

[0031] In some embodiments, the anti-backflow unit includes one anti-backflow element, or at least two anti-backflow elements connected in series; wherein the anti-backflow element includes at least two diodes connected in parallel.

[0032] Through the aforementioned technical means, the anti-backflow unit includes an anti-backflow element consisting of at least two diodes connected in parallel, which can prevent current backflow and improve the safety of the power supply circuit. Furthermore, the connection of at least two anti-backflow elements in series enables the power management unit to have redundancy, further enhancing the safety of the power supply circuit.

[0033] In some embodiments, the power supply circuit further includes a light source device capable of providing illumination compensation to the photovoltaic branch; wherein: the light source device is used to provide illumination compensation to the photovoltaic branch when the light source corresponding to the photovoltaic branch is less than a preset light source intensity.

[0034] By employing the aforementioned technical means, when the light source corresponding to the photovoltaic branch is less than the preset light source intensity, the light source device can provide illumination compensation to the photovoltaic branch, enabling the photovoltaic branch to generate sufficient electrical energy to power the load of the energy storage submodule, thereby improving the reliability of power supply.

[0035] Secondly, embodiments of this disclosure provide a power supply control method, which includes:

[0036] Obtain the electrical power output from the first power supply circuit;

[0037] When it is determined that the power output of the first power supply circuit is lower than the first preset threshold, a first control signal is generated;

[0038] The first control signal controls the second power supply circuit to supply power to the load of the energy storage submodule.

[0039] Using the aforementioned technical means, this power supply control method is applied to a power supply circuit, which includes a first power supply circuit and a second power supply circuit. When the output power of the first power supply circuit is lower than a first preset threshold, a first control signal can be generated. Based on this first control signal, the second power supply circuit can be controlled to supply power to the load of the energy storage submodule. Thus, when the power of the first power supply circuit is insufficient or when there is an abnormality in the first power supply circuit, the second power supply circuit can supply power to the load of the energy storage submodule, thereby ensuring uninterrupted power supply to the high-voltage energy storage system and improving the reliability of the power supply.

[0040] In some embodiments, controlling the second power supply circuit to supply power to the load of the energy storage submodule based on the first control signal includes: when the second power supply circuit includes a photovoltaic branch and a power supply battery branch, and the photovoltaic branch includes the first photovoltaic branch, acquiring the electrical power output of the first photovoltaic branch; when it is determined that the electrical power output of the first photovoltaic branch is lower than a second preset threshold, generating a second control signal; and controlling the power supply battery branch to provide the required shortfall power based on the second control signal, so as to supply power to the load of the energy storage submodule together with the first photovoltaic branch.

[0041] Using the aforementioned technical means, when the power of the first photovoltaic branch is lower than the second preset threshold, it indicates that the first photovoltaic branch cannot maintain the normal operation of the energy storage submodule load. At this time, a second control signal is generated, and the power supply battery branch is controlled to provide the shortfall power based on the second control signal. Then, the first photovoltaic branch and the power supply battery branch jointly supply power to the energy storage submodule to maintain the normal operation of the energy storage submodule load. This ensures uninterrupted power supply to the high-voltage energy storage system, thereby improving the reliability and safety of power supply.

[0042] In some embodiments, controlling the power supply battery branch to provide the required underpowered power based on the second control signal to jointly supply power to the load of the energy storage submodule with the first photovoltaic branch includes: controlling the second power supply management unit and the third power supply management unit to be turned on based on the second control signal, and controlling the first power supply management unit to be turned off, so that the power supply battery branch and the first photovoltaic branch jointly supply power to the load of the energy storage submodule.

[0043] Through the above-mentioned technical means, based on the second control signal, the second power supply management unit and the third power supply management unit are controlled to be turned on, and the first power supply management unit is controlled to be turned off, so that the power supply battery branch and the first photovoltaic branch jointly supply power to the load of the energy storage submodule, so as to maintain the normal operation of the load of the energy storage submodule. This can ensure uninterrupted power supply to the high-voltage energy storage system, thereby improving the reliability and safety of power supply.

[0044] In some embodiments, the method further includes: generating a third control signal when it is determined that the electrical power output of the first photovoltaic branch is higher than a second preset threshold; and controlling the first photovoltaic branch to supply power to the load and / or power supply battery branch of the energy storage submodule based on the third control signal.

[0045] Using the above-mentioned technical means, when the power of the first photovoltaic branch is higher than the second preset threshold, it indicates that the first photovoltaic branch can maintain the normal operation of the load of the energy storage submodule. At this time, a third control signal is generated and the first photovoltaic branch is controlled to supply power to the power supply battery branch and / or the energy storage submodule based on the third control signal. This can ensure uninterrupted power supply to the high-voltage energy storage system, thereby improving the reliability and safety of power supply, and also improving the utilization rate of the first photovoltaic branch.

[0046] In some embodiments, controlling the first photovoltaic branch to supply power to the load and / or power supply battery branch of the energy storage submodule based on a third control signal includes: controlling the second power supply management unit to turn on and controlling the first power supply management unit, the third power supply management unit, and the fourth power supply management unit to turn off, so that the first photovoltaic branch supplies power to the load of the energy storage submodule; or, controlling the fourth power supply management unit to turn on and controlling the first power supply management unit, the second power supply management unit, and the third power supply management unit to turn off, so that the first photovoltaic branch supplies power to the power supply battery branch; or, controlling the second power supply management unit and the fourth power supply management unit to turn on and controlling the first power supply management unit and the third power supply management unit to turn off, so that the first photovoltaic branch supplies power to the load and power supply battery branch of the energy storage submodule.

[0047] By employing the aforementioned technical means, the first, third, and fourth power supply management units are controlled to be either on or off based on the third control signal. Power is supplied to the load of the energy storage submodule through the first photovoltaic branch, ensuring uninterrupted power supply to the high-voltage energy storage system and thus improving power supply reliability. Alternatively, power can be supplied to the power supply battery branch through the first photovoltaic branch, providing sufficient power to supply the load of the energy storage submodule and improving power supply safety. Or, power can be supplied to both the power supply battery branch and the load of the energy storage submodule through the first photovoltaic branch, improving power supply reliability and safety, and increasing the utilization rate of the first photovoltaic branch.

[0048] In some embodiments, the method further includes: when the photovoltaic branch also includes a second photovoltaic branch, acquiring the electrical power output of the second photovoltaic branch, and generating a fourth control signal when it is determined that the electrical power output of the second photovoltaic branch is higher than a third preset threshold; and controlling the second photovoltaic branch to supply power to the load of the power supply battery branch and / or energy storage submodule based on the fourth control signal.

[0049] Using the aforementioned technical means, if the power of the second photovoltaic branch is higher than the third preset threshold, it indicates that the second photovoltaic branch is able to supply power to the battery branch and / or energy storage submodule and is operating normally. At this time, a third control signal is generated and the second photovoltaic branch is controlled to supply power to the battery branch and / or energy storage submodule based on the third control signal. This ensures uninterrupted power supply to the high-voltage energy storage system, improves the reliability of power supply, and also avoids over-discharge caused by continuous discharge of the battery branch, thus improving power supply safety.

[0050] In some embodiments, controlling the second photovoltaic branch to supply power to the load of the power supply battery branch and / or the energy storage submodule based on the fourth control signal includes: controlling the fifth power management unit to be turned on and the third power management unit to be turned off based on the fourth control signal, so that the second photovoltaic branch supplies power to the power supply battery branch; or, controlling the fifth power management unit and the third power management unit to be turned on, so that the second photovoltaic branch supplies power to the load of the energy storage submodule; or, controlling the fifth power management unit and the third power management unit to be turned on, so that the second photovoltaic branch supplies power to the load of the power supply battery branch and the energy storage submodule.

[0051] By employing the aforementioned technical means, and controlling the third and fifth power supply management units to be on or off based on the fourth control signal, power can be supplied to the load of the energy storage submodule through the second photovoltaic branch, ensuring uninterrupted power supply to the high-voltage energy storage system and thus improving power supply reliability. Alternatively, power can be supplied to the power supply battery branch through the second photovoltaic branch, avoiding over-discharge caused by continuous discharge of the power supply battery branch and improving power supply safety. Or, power can be supplied to both the power supply battery branch and the load of the energy storage submodule through the second photovoltaic branch, improving power supply reliability and safety, and increasing the utilization rate of the second photovoltaic branch.

[0052] In some embodiments, the method further includes: generating a fifth control signal when it is determined that the power output of the first power supply circuit is higher than a first preset threshold; and controlling the first power supply circuit to supply power to the load of the energy storage submodule based on the fifth control signal.

[0053] Using the above-mentioned technical means, when the power output of the first power supply circuit is higher than the first preset threshold, it indicates that the first power supply circuit can maintain the operation of the energy storage submodule. At this time, a fifth control signal is generated, and the first power supply circuit is controlled to supply power to the load of the energy storage submodule according to the fifth control signal, so as to ensure the normal operation of the high-voltage energy storage system and improve the reliability and safety of power supply.

[0054] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory, and are not intended to limit the technical solutions of this disclosure. Attached Figure Description

[0055] Figure 1 is a schematic diagram of the composition structure of a power supply circuit provided in an embodiment of this disclosure;

[0056] Figure 2 is a schematic diagram of the composition structure of a power supply circuit provided in an embodiment of this disclosure;

[0057] Figure 3 is a schematic diagram of the composition structure of a power supply circuit provided in an embodiment of this disclosure.

[0058] Figure 4 is a schematic diagram of the composition structure of a power supply management unit provided in an embodiment of this disclosure;

[0059] Figure 5 is a schematic diagram of the composition structure of a power supply management unit provided in an embodiment of this disclosure;

[0060] Figure 6 is a schematic diagram of the composition structure of a power supply circuit provided in an embodiment of this disclosure;

[0061] Figure 7 is a schematic diagram of the composition structure of a power supply circuit provided in an embodiment of this disclosure.

[0062] Figure 8 is a schematic diagram of an application scenario of a power supply circuit provided in an embodiment of this disclosure;

[0063] Figure 9 is a schematic diagram of an application scenario of a power supply circuit provided in an embodiment of this disclosure;

[0064] Figure 10 is a schematic flowchart of a power supply control method provided in an embodiment of this disclosure;

[0065] Figure 11 is a detailed flowchart of a power supply control method provided in an embodiment of this disclosure;

[0066] Figure 12 is a schematic diagram of the composition structure of a high-voltage energy storage system provided in an embodiment of this disclosure. Detailed Implementation

[0067] To gain a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for reference and illustration only and are not intended to limit the embodiments of this disclosure.

[0068] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing embodiments of this disclosure only and is not intended to be limiting of this disclosure.

[0069] In the following description, references are made to “some embodiments,” which describe a subset of all possible embodiments. However, it is understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0070] It should also be noted that the terms "first, second, third" used in the embodiments of this disclosure are only used to distinguish similar objects and do not represent a specific order of objects. It is understood that "first, second, third" can be interchanged in a specific order or sequence where permitted, so that the embodiments of this disclosure described herein can be implemented in an order other than that illustrated or described herein.

[0071] Furthermore, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this disclosure. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0072] The following is a description of the relevant technologies disclosed herein.

[0073] New energy batteries are being used more and more widely in daily life and industry. For example, new energy vehicles equipped with batteries are already widely used. In addition, batteries are being used more and more in the field of energy storage.

[0074] Currently, new energy batteries are being used more and more widely in daily life and industry. They are not only used in energy storage systems for hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of the application areas of power batteries, the market demand is also constantly increasing.

[0075] In this embodiment, the battery can be a single battery cell. A single battery cell refers to a basic unit capable of converting chemical energy into electrical energy, and can be used to manufacture battery modules or battery packs to supply power to electrical devices. A single battery cell can be a rechargeable battery, which is a battery cell that can be recharged after discharge to reactivate its active materials and continue to be used. The single battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this embodiment is not limited to these types.

[0076] In embodiments of this disclosure, the battery may also be a single physical module comprising one or more battery cells to provide higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, parallel, or mixed via a busbar.

[0077] With the transformation of the global energy structure and the rapid development of renewable energy, energy storage systems are playing an increasingly prominent role in the power system. Among them, cascaded high-voltage energy storage systems, as a representative of new energy storage technologies, are gradually becoming an important choice for large-scale energy storage applications due to their advantages such as low cost, high efficiency, and high security.

[0078] In related technologies, redundant power supply in cascaded high-voltage energy storage systems is typically achieved through cross-powering of adjacent power modules. This approach allows adjacent modules to provide power support in the event of a failure in one power module, ensuring the overall stable operation of the system. However, this redundant power supply method cannot meet high reliability requirements, resulting in poor power supply reliability.

[0079] In short, with the deepening of the clean and low-carbon energy transition and the increasing proportion of new energy sources such as wind and solar power, the grid fluctuations caused by the instability of new energy output are becoming increasingly prominent. To solve this problem, wind and solar power generation is combined with energy storage technology. Excess electricity is stored through energy storage and released to supply power when wind and solar resources are insufficient or unavailable—this is known as wind-solar-energy storage integration. Currently, cascaded high-voltage energy storage systems are the mainstream choice for wind-solar-energy storage integration. The core component of a cascaded high-voltage energy storage system is the energy storage submodule container; therefore, ensuring the safe and stable operation of the energy storage submodule container is crucial for the high reliability of the cascaded high-voltage energy storage system and even the power system as a whole.

[0080] Based on this, this disclosure provides a power supply circuit for a high-voltage energy storage system. The power supply circuit includes a first power supply circuit and a second power supply circuit. The output terminal of the first power supply circuit is connected to the load of the energy storage submodule, and the input terminal of the first power supply circuit is configured to draw power from within the high-voltage energy storage system. In this case, DC power can be supplied to the load of the energy storage submodule after drawing power from the high-voltage energy storage system via the first power supply circuit. The output terminal of the second power supply circuit is connected to the load of the energy storage submodule, and the input terminal of the second power supply circuit is configured to receive DC power from the photovoltaic branch. In this case, DC power can be supplied to the load of the energy storage submodule after drawing power from the photovoltaic branch via the first power supply circuit and the second power supply circuit. Thus, power can be supplied to the load by drawing power from within the high-voltage energy storage system or from the photovoltaic branch through the first and second power supply circuits, thereby achieving a redundant power supply design. For example, when the first power supply circuit is functioning normally, power can be drawn from within the high-voltage energy storage system to supply power to the load; when the first power supply circuit malfunctions, power can be supplied to the load by drawing power from the photovoltaic branch via the second power supply circuit, thereby ensuring uninterrupted power supply to the high-voltage energy storage system and improving power supply reliability. In addition, equipotential bonding refers to connecting the photovoltaic branch to a certain potential on the energy storage submodule using a conductor to make their potentials equal. Because the photovoltaic branch and the energy storage submodule are connected at equipotential, the potential of the photovoltaic branch is comparable to that of the energy storage submodule, and the difference does not exceed the range of the voltage of one energy storage submodule. Therefore, when power is drawn from the photovoltaic branch to supply power to the load of the energy storage submodule, high-voltage isolation is no longer required, reducing equipment failures such as discharge and breakdown caused by high voltage differences. This also reduces the cost of power supply and improves the safety of power supply.

[0081] The present disclosure will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0082] In one embodiment of this disclosure, FIG1 is a schematic diagram of the composition structure of a power supply circuit provided in this embodiment. As shown in FIG1, the power supply circuit includes 10, which may include a first power supply circuit 11 and a second power supply circuit 12, and is configured to output DC power to the load 13 of the energy storage submodule.

[0083] The output terminals of both the first power supply circuit 11 and the second power supply circuit 12 are connected to the load 13 of the energy storage submodule. The input terminal of the first power supply circuit 11 is configured to draw power from the inside of the high-voltage energy storage system. Drawing power from the inside means drawing power from the energy storage devices in the high-voltage energy storage system, such as drawing power from the battery in the high-voltage energy storage system, or drawing power from the capacitor in the power module that controls the charging and discharging of the battery, or drawing power from the DC line between the battery and the power module, etc. There is no limitation here.

[0084] The second power supply circuit 12 includes a photovoltaic branch 121, which is configured to be equipotentially connected to the energy storage submodule, and the input terminal of the second power supply circuit 12 is configured to input DC power to the photovoltaic branch 121.

[0085] In this embodiment, the power supply circuit 10 is applied to a high-voltage energy storage system, which includes at least one energy storage submodule. Each energy storage submodule can be equipped with its own power supply circuit 10, which reliably supplies power to the load 13, ensuring the submodule operates normally. The load can be a downstream load connected to the submodule, such as various electrical devices and systems downstream of it. Alternatively, the downstream load could be the submodule's controller or driver. Thus, by supplying power to the load 13, the power supply circuit 10 maintains the submodule's normal operation, thereby ensuring the stable and efficient operation of the high-voltage energy storage system.

[0086] It should be noted that, in the embodiments of this disclosure, the concepts of high voltage and low voltage are relative in this art. For example, a device with a voltage to ground of 1000V or less can be referred to as low voltage; a device with a voltage to ground of 1000V or more can be referred to as high voltage. Here, high voltage can be simply referred to as "high voltage," typically referring to bus voltage, battery voltage, etc., above 1000V, without any limitation.

[0087] In this embodiment, the equipotential bonding method includes, but is not limited to, connecting the potentials of the photovoltaic branch 121 and the energy storage submodule located on the insulating platform together through electrodes, conductors, etc., or grounding the photovoltaic branch and the energy storage submodule through a conductor. The specific equipotential bonding method is not limited here. It should be noted that if the potential difference between the photovoltaic branch 121 and the energy storage submodule is within a preset range, then the photovoltaic branch 121 and the energy storage submodule are considered to have equivalent potentials, i.e., the photovoltaic potential 121 and the energy storage submodule are at the same potential. Here, the preset range needs to ensure that the potential difference between the photovoltaic branch 121 and the energy storage submodule does not cause insulation risk. For example, the preset range is no more than the voltage of one energy storage submodule, which can be determined according to the actual situation. For example, if the potential difference between the photovoltaic branch 121 and the energy storage submodule is 1V, it will not cause insulation risk, so the photovoltaic branch 121 and the energy storage submodule can be considered to have equivalent potentials.

[0088] In some embodiments, as shown in FIG2, the power supply circuit 10 may further include a power supply battery branch 122, which is configured to be equipotentially connected to the energy storage submodule, and the input terminal of the second power supply circuit 12 is further configured to input DC power to the power supply battery branch 122.

[0089] In this embodiment, the main component of the power supply battery branch 122 includes an energy storage element, and the number of energy storage elements is at least one. That is, in this embodiment, the power supply battery branch 122 may have only one energy storage element, or it may have multiple energy storage elements. The energy storage element can take many forms; for example, it may include a battery, a supercapacitor, a flywheel energy storage device, a gas compression energy storage device, or any combination thereof. Alternatively, other devices known in the art capable of storing electrical energy, such as cascade batteries, may be selected. Those skilled in the art can choose from these devices according to actual needs.

[0090] In one specific embodiment, the energy storage element can be a battery, and the power supply battery branch 122 can be composed of one or more batteries connected in series and parallel. In this case, the power supply battery branch 122 can also be called a battery module.

[0091] Thus, in this embodiment, the input terminal of the second power supply circuit 12 is configured to receive DC power from the power supply battery branch 122. In this case, the second power supply circuit 12 can draw power from the power supply battery branch 122 and supply DC power to the load 13 of the energy storage submodule. This allows for uninterrupted power supply to the high-voltage energy storage system using the first power supply circuit 11, the photovoltaic branch 121, and the power supply battery branch 122, improving power supply reliability. Furthermore, since the power supply battery branch 122 is equipotentially connected to the energy storage submodule, its potential is comparable to that of the energy storage submodule. Therefore, when supplying power to the load 13 of the energy storage submodule through the power supply battery branch 122, high-voltage isolation is no longer required, reducing equipment failures such as discharge and breakdown caused by high voltage differences. This also reduces power supply costs and improves power supply safety.

[0092] In this embodiment, the input terminal of the second power supply circuit 12 may include the input terminal of the photovoltaic branch 121, or it may include the input terminal of the power supply battery branch 122, or it may refer to both the input terminal of the photovoltaic branch 121 and the input terminal of the power supply battery branch 122. Specifically, when only the photovoltaic branch 121 is used to power the load 13, the input terminal of the second power supply circuit 12 is the input terminal of the second photovoltaic branch 121; when only the power supply battery branch 122 is used to power the load, the input terminal of the second power supply circuit 12 is the input terminal of the power supply battery branch 122; when both the photovoltaic branch 121 and the power supply battery branch are used to power the load 13, the input terminal of the second power supply circuit 12 is both the input terminal of the second photovoltaic branch 121 and the input terminal of the power supply battery branch 122.

[0093] In some embodiments, referring to FIG2, the photovoltaic branch 121 includes a first photovoltaic branch 1211, and the first photovoltaic branch 1211 includes a first photovoltaic unit 201 and a first voltage conversion unit 202; wherein, the first voltage conversion unit 202 is configured to convert the DC power output by the first photovoltaic unit 201 into a first electrical power and output it.

[0094] In this embodiment, the first voltage conversion unit 202 is connected between the first photovoltaic unit 201 and the load 13 of the energy storage submodule. Here, the first photovoltaic unit 201 can be a photovoltaic panel, or a solar photovoltaic panel, which uses the photovoltaic effect to convert sunlight into direct current (or electrical energy). Alternatively, the first voltage conversion unit 202 can be a shunt voltage regulator circuit, which converts unstable direct current into stable direct current output to ensure the normal operation of the load 13. The first voltage conversion unit 202 can also be a direct current to direct current (DC-DC) circuit; no specific limitation is made here, as long as it converts the direct current output from the first photovoltaic unit 201 into the stable power required by the load 13.

[0095] In some embodiments, referring again to FIG2, the first power supply circuit 11 may include a power supply interface 111 and an energy harvesting unit 112. The energy harvesting unit 112 is connected between the power supply interface 111 and the load 13 of the energy storage submodule.

[0096] In this embodiment, the power supply interface 111 is connected to the energy extraction point, which can be inside the high-voltage energy storage system. That is, the first power supply circuit draws power from inside the high-voltage energy storage system and supplies DC power to the load 13 to maintain the normal operation of the energy storage submodule. Furthermore, since the first power supply circuit draws power from inside the high-voltage energy storage system, the potential of the first power supply circuit 111 and the energy storage submodule are equal, thus eliminating the need for high-voltage isolation and reducing power supply costs.

[0097] In some embodiments, the energy harvesting unit 112 draws power from the high-voltage energy storage system and converts it into the electrical power required by the load 13. Specifically, the energy harvesting unit 112 can be a DC-DC circuit that converts the direct current obtained from the high-voltage energy storage system to meet the power requirements of the load 13.

[0098] Furthermore, in this embodiment, when the first power supply circuit 11 is operating normally (i.e., without abnormalities), it can supply power to the load 13. When the first power supply circuit 11 malfunctions, the first photovoltaic branch 1211 and / or the power supply battery branch 122 in the second power supply circuit 12 can provide redundant power to the load 13, thereby improving the reliability of the power supply. It can be understood that the first power supply circuit 11 can be referred to as the main power supply branch, and the second power supply circuit 12 can be referred to as the redundant power supply branch.

[0099] In some embodiments, the power supply circuit 10 may further include a light source device that can provide illumination compensation to the photovoltaic branch 121.

[0100] In this embodiment of the disclosure, the light source device can be used to provide illumination compensation to the photovoltaic branch 121 when the light source corresponding to the photovoltaic branch 121 is less than the preset light source intensity.

[0101] In this embodiment, the preset light intensity can be the light intensity corresponding to the photovoltaic branch 121 generating sufficient electrical energy. The light source corresponding to the photovoltaic branch 121 can be compared with the preset light source intensity. When the light source corresponding to the photovoltaic branch 121 is greater than or equal to the preset light source intensity, it indicates that the photovoltaic branch 121 can generate sufficient electrical energy to power the load 13. When the light source corresponding to the photovoltaic branch 121 is less than the preset light source intensity, it indicates that the photovoltaic branch 121 cannot generate sufficient electrical energy to power the load 13. In this case, light compensation is provided to the photovoltaic branch 121 through a light source device to enable the photovoltaic branch 121 to generate sufficient electrical energy to power the load 13. Here, the light source device can be a supplementary light, an incandescent lamp, etc., and is not specifically limited thereto.

[0102] In addition, in this embodiment of the present disclosure, if the high-voltage energy storage system is installed indoors, a light source device can be installed in the indoor valve hall to provide illumination compensation for the photovoltaic branch 121. For example, a certain number of supplementary lights can be installed on the top of the indoor valve hall. By adjusting the light source of these supplementary lights to provide illumination compensation for the photovoltaic branch 121, the redundant power supply problem of the indoor high-voltage energy storage system can be effectively solved.

[0103] Thus, in this embodiment of the present disclosure, when the light source corresponding to the photovoltaic branch 121 is less than the preset light source intensity, the light source device can provide light compensation to the photovoltaic branch 121 so that the photovoltaic branch 121 can generate enough electrical energy to power the load 13, thereby improving the reliability of the power supply.

[0104] In some embodiments, the energy storage submodule of the high-voltage energy storage system is located inside the storage chamber, the photovoltaic branch 121 is located outside the storage chamber, and the potential difference between the storage chamber and the energy storage submodule is greater than a preset difference threshold; the photovoltaic branch 121 and the energy storage submodule are connected through an equipotential line, and the equipotential line is insulated from the storage chamber.

[0105] In this embodiment, the storage unit can be a container, shell, or cabinet, etc. It should be noted that if the energy storage submodule is located inside the storage unit and the photovoltaic branch 121 is located outside, and if an equipotential bonding design is used between the storage unit and the energy storage submodule, the photovoltaic branch 121 can be directly connected to the storage unit. If an equipotential bonding design is not used between the storage unit and the energy storage submodule, an equipotential line is used to insulate the storage unit, for example, by using an insulating sleeve, to avoid insulation risks. For example, if the storage unit is a container, and the container shell is grounded (i.e., zero potential), and the energy storage submodule is supported by insulators inside the container, resulting in a large potential difference between the container shell and the energy storage submodule (i.e., a potential difference greater than a preset threshold), holes can be drilled in the container, and the equipotential line of the photovoltaic branch 121 can be connected to the energy storage submodule through these holes using an insulating sleeve, thus avoiding insulation risks and improving the safety of the high-voltage energy storage system.

[0106] In some embodiments, the energy storage submodule and photovoltaic branch 121 of the high-voltage energy storage system are both located inside the chamber.

[0107] In this embodiment, both the photovoltaic branch 121 and the energy storage submodule can be housed within the storage chamber. If the storage chamber has a light-transmitting portion, the photovoltaic branch 121 can receive sunlight to generate electricity to power the load 13 of the energy storage submodule. If the storage chamber lacks a light-transmitting portion, a light source device is required to provide sunlight to the photovoltaic branch 121 so that it can generate electricity. It is important to note that in this case, the power supply station needs to power the light source device to prevent voltage fluctuations in the energy storage submodule, thus improving the safety of the high-voltage energy storage system. Here, the power supply station can refer to the power plant or the power plant's own power source, without any limitation.

[0108] This disclosure provides a power supply circuit. The output of a first power supply circuit is connected to the load of an energy storage submodule, and its input is configured to draw power from the high-voltage energy storage system. In this case, DC power can be supplied to the load of the energy storage submodule after drawing power from the high-voltage energy storage system via the first power supply circuit. The output of a second power supply circuit is also connected to the load of the energy storage submodule, and its input is configured to receive DC power from the photovoltaic branch. In this case, DC power can be supplied to the load of the energy storage submodule after drawing power from the photovoltaic branch via the second power supply circuit. Thus, the first and second power supply circuits can draw power from the high-voltage energy storage system or from the photovoltaic branch to supply power to the load, achieving a redundant power supply design. For example, when the first power supply circuit is functioning normally, power can be drawn from the high-voltage energy storage system to supply power to the load; when the first power supply circuit malfunctions, power can be drawn from the photovoltaic branch via the second power supply circuit to supply power to the load, thereby ensuring uninterrupted power supply to the high-voltage energy storage system and improving power supply reliability. In addition, since the photovoltaic branch and the energy storage submodule are connected at the same potential, the potential of the photovoltaic branch is equivalent to that of the energy storage submodule. Therefore, when power is drawn from the photovoltaic branch to supply power to the load of the energy storage submodule, high-voltage isolation is no longer required. This reduces equipment failures such as discharge and breakdown caused by high voltage difference, thereby reducing the cost of power supply and improving the safety of power supply.

[0109] In another embodiment of this disclosure, based on the power supply circuit 10 shown in FIG2, FIG3 is a schematic diagram of the composition structure of a power supply circuit provided in an embodiment of this disclosure. As shown in FIG3, the power supply circuit 10 includes a first power supply management unit 14, a second power supply management unit 15, and a third power supply management unit 16.

[0110] In this embodiment, the input terminal of the first power supply management unit 14 is connected to the output terminal of the energy harvesting unit 112, and the output terminal of the first power supply management unit 14 is connected to the load 13 of the energy storage submodule; the input terminal of the second power supply management unit 15 is connected to the output terminal of the first voltage conversion unit 202, and the output terminal of the second power supply management unit 15 is connected to the load 13 of the energy storage submodule; the input terminal of the third power supply management unit 16 is connected to the output terminal of the power supply battery branch 122, and the output terminal of the third power supply management unit 16 is connected to the load 13 of the energy storage submodule.

[0111] That is, the first power management unit 14 is connected between the output terminal of the first power supply circuit 11 and the load 13 of the energy storage submodule; the second power management unit 15 is connected between the output terminal of the first photovoltaic branch 1211 and the load 13 of the energy storage submodule; and the third power management unit 16 is connected between the output terminal of the power supply battery branch 122 and the load 13 of the energy storage submodule.

[0112] In some embodiments, at least one of the first power management unit 14, the second power management unit 15, and the third power management unit 16 may include an anti-backflow unit; or, it may include a switch unit and an anti-backflow unit, with the switch unit and the anti-backflow unit connected in series.

[0113] In the embodiments disclosed herein, the circuit structures of the first power management unit 14, the second power management unit 15, and the third power management unit 16 may be the same or different, and no limitation is made here.

[0114] In one possible implementation, the anti-backflow unit may include at least one anti-backflow element.

[0115] In this embodiment of the disclosure, the anti-backflow element can be obtained by connecting at least two diodes in parallel. Here, by forming an anti-backflow unit by connecting at least two diodes in series and parallel, the components in the circuit can be protected from damage by reverse current, effectively preventing the occurrence of backflow and improving the safety of the power supply circuit.

[0116] In one possible implementation, the anti-backflow unit includes at least two anti-backflow elements connected in series.

[0117] In one specific implementation, the anti-backflow element comprises two diodes connected in parallel, and the anti-backflow unit can be formed by two anti-backflow elements connected in series. It can be understood that the anti-backflow unit may include four diodes connected in a double series and double parallel configuration. Figure 4 is a schematic diagram of the composition structure of a power supply management unit provided in an embodiment of this disclosure. As shown in Figure 4, the power supply management unit may include an anti-backflow unit, and the anti-backflow unit may include a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4.

[0118] In this embodiment of the present disclosure, the positive terminal of the first diode D1 is connected to the positive terminal of the third diode D3, and the negative terminal of the first diode D1 is connected to the negative terminal of the third diode D3, the positive terminal of the second diode D2, and the positive terminal of the fourth diode D4, respectively; the negative terminal of the third diode D3 is connected to the positive terminal of the second diode D2 and the positive terminal of the fourth diode D4, respectively; and the negative terminal of the second diode D2 is connected to the negative terminal of the fourth diode D4.

[0119] It can be understood that the first diode D1 and the second diode D3 are one anti-backflow element, and the second diode D2 and the fourth diode D4 are another anti-backflow element. The two anti-backflow elements are connected in series to obtain the anti-backflow unit.

[0120] In this embodiment of the present disclosure, as shown in FIG4, a power supply management unit is constructed by connecting four diodes in a double series and double parallel configuration, thereby providing redundancy and improving the reliability of the power supply management unit. For example, if two diodes need to be connected in series to the power supply circuit, such as the first diode D1 and the second diode D2 connected in series, but the second diode D2 fails, the first diode D1 and the fourth diode D4 can be selected to be connected in series to the power supply circuit, thus providing redundancy to the power supply management unit and improving the reliability of the power supply circuit.

[0121] Thus, in this embodiment of the disclosure, the anti-backflow unit includes an anti-backflow element consisting of at least two diodes connected in parallel, which can prevent current backflow and improve the safety of the power supply circuit. Furthermore, the connection of at least two anti-backflow elements in series enables the power management unit to have redundancy, further improving the safety of the power supply circuit.

[0122] In one possible implementation, the power supply management unit may include a switching unit and an anti-backflow unit, with the switching unit and the anti-backflow unit connected in series.

[0123] In this embodiment, the backflow prevention unit may include two backflow prevention elements connected in series, and the backflow prevention element is obtained by two diodes connected in parallel. The switching unit may include a switch, or at least two switches connected in series, in parallel, or in a series-parallel connection. The switching unit may also be a circuit breaker, disconnecting switch, vacuum switch unit, etc., as long as it has a switching function (i.e., conduction or disconnection).

[0124] In this embodiment of the disclosure, based on FIG4 and as shown in FIG5, the power supply management unit may include a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, and a switch K. The switch K is a switching unit.

[0125] In this embodiment, the positive terminals of the first diode D1 and the third diode D3 are also connected to the switch K. It can be understood that the power supply management unit includes four diodes connected in a double-series, double-parallel configuration to form an anti-backflow unit, providing redundancy and thus improving the reliability of the power supply management unit. Furthermore, the power supply management unit may include a switching unit, which can control each power supply branch to supply power to the load, thus ensuring the normal operation of the high-voltage energy storage system.

[0126] Thus, in this embodiment of the present disclosure, the backflow prevention unit in the power supply management unit can prevent current backflow and improve the safety of the power supply circuit. In addition, the power supply management unit may also include a switching unit, which can perform power supply priority control on each power supply branch, thereby improving the reliability of the power supply.

[0127] In some embodiments, as shown in FIG6, the power supply circuit 10 further includes a fourth power supply management unit 17; wherein, one end of the fourth power supply management unit 17 is connected between the output terminal of the first photovoltaic branch 1211 and the input terminal of the second power supply management unit 15; the other end of the fourth power supply management unit 17 is connected between the output terminal of the power supply battery branch 122 and the input terminal of the third power supply management unit 16.

[0128] In this embodiment of the present disclosure, the fourth power supply management unit 17 may include an anti-backflow unit; or, it may include a switch unit and an anti-backflow unit, wherein the switch unit and the anti-backflow unit are connected in series.

[0129] In this embodiment, if the power output of the first photovoltaic branch 1211 meets the preset charging power requirement for the power supply battery branch 122, then the fourth power supply management unit 17 can supply power to the power supply battery branch 122 through the first photovoltaic branch 1211. This avoids the problem of the power supply battery branch 122 failing to supply power to the load 13 due to insufficient power when the first power supply circuit 11 malfunctions and the first photovoltaic branch 1211 cannot supply power to the load 13, thus preventing the high-voltage energy storage system from stopping operation. Here, the preset charging power refers to the charging power requirement of the power supply battery branch 122.

[0130] Thus, in this embodiment, since one end of the fourth power supply management unit 17 is connected between the first photovoltaic branch 1211 and the second power supply management unit 15, and the other end of the fourth power supply management unit 17 is connected between the power supply battery branch 122 and the third power supply management unit 16, when the second power supply circuit 12 draws power from the first photovoltaic branch 1211, it can supply power to the power supply battery branch 122 through the fourth power supply management unit 17, thereby improving the utilization rate of the power supply circuit and enabling the power supply battery branch 122 to provide sufficient DC power to the load 13 of the energy storage system, thereby improving the reliability of the power supply.

[0131] This disclosure provides a power supply circuit in which a first power supply management unit is connected between the first power supply circuit and the load of the energy storage submodule, a second power supply management unit is connected between the first photovoltaic branch and the load of the energy storage submodule, and a third power supply management unit is connected between the power supply battery branch and the load of the energy storage submodule. In this way, the power supply management units of the first, second, and third power supply management units can manage the power supply of each power supply branch (e.g., the first power supply circuit, the first photovoltaic branch, and the power supply battery branch), ensuring uninterrupted power supply to the high-voltage energy storage system and thus improving the reliability of the power supply.

[0132] In another embodiment of this disclosure, based on the power supply circuit 10 shown in FIG3, FIG7 is a schematic diagram of the composition structure of a power supply circuit provided in an embodiment of this disclosure. As shown in FIG7, the photovoltaic branch 121 further includes a second photovoltaic branch 1212; wherein, the output terminal of the second photovoltaic branch 1212 is connected between the power supply battery branch 122 and the load 13 of the energy storage submodule, and is configured to provide DC power to the power supply battery branch 121 and / or the load 13 of the energy storage submodule.

[0133] In some embodiments, referring to FIG7, the second photovoltaic branch 1212 includes a second photovoltaic unit 701 and a second voltage conversion unit 702.

[0134] In this embodiment of the present disclosure, the output terminal of the second photovoltaic unit 701 is connected to the input terminal of the second voltage conversion unit 702, and the second voltage conversion unit 702 is configured to convert the DC power output by the second photovoltaic unit 701 into a second electric power and output it.

[0135] Thus, in the application embodiment, the DC power output by the second photovoltaic unit is converted into the second electrical power by the second voltage conversion unit. When the second power supply circuit draws power from the first photovoltaic branch and supplies power to the load of the power supply battery branch and / or energy storage submodule, it can meet the power requirements of the power supply battery branch and / or energy storage submodule, ensuring uninterrupted power supply to the high-voltage energy storage system and thereby improving the reliability of power supply.

[0136] In this embodiment, the first photovoltaic branch 201 can be referred to as a power supply photovoltaic panel. The input terminal of the first voltage conversion unit 202 is connected to the output terminal of the first photovoltaic branch 201, allowing power to be drawn from the first photovoltaic branch 201 to supply power to the load 13. The second photovoltaic unit 701 can be referred to as a charging photovoltaic panel. The input terminal of the second voltage conversion unit 702 is connected to the output terminal of the second photovoltaic unit 701, allowing power to be drawn from the second photovoltaic unit 701 to supply power to the power supply battery branch 122, ensuring that the power supply battery branch 122 has sufficient power to supply power to the load 13. Here, the circuit structures of the second voltage conversion unit 702 and the first voltage conversion unit 202 can be the same or different; exemplaryly, both the second voltage conversion unit 702 and the first voltage conversion unit 202 can be DC-DC circuits.

[0137] It is understandable that by implementing hierarchical management of photovoltaic branch 121 (i.e., first photovoltaic branch 1211 and second photovoltaic branch 1212), in the event of an anomaly in the first power supply circuit 11, the second power supply circuit 12 is used to supply power. If the power output of the first photovoltaic branch 1211 is sufficient to power the load 13, then the first photovoltaic branch 1211 can be used to power the load 13, while the second photovoltaic branch 1212 charges the power supply battery branch 122. When the power output of the first photovoltaic branch 1211 is insufficient to power the load 13, the power supply battery branch 122 becomes the primary power supply branch, and the first photovoltaic branch 1211 becomes the auxiliary power supply branch. The load can be jointly powered by the power supply battery branch 122 and the first photovoltaic branch 1211, thus improving the reliability of redundant power supply.

[0138] In this embodiment, the second photovoltaic branch 701 can also be connected to the load 13 of the energy storage submodule. After the second photovoltaic branch 701 is fully charged to the power supply battery branch 122, it can supply power to the load 13.

[0139] In some embodiments, referring further to FIG7, the power supply circuit 10 may further include a fifth power supply management unit 18; wherein, the input terminal of the fifth power supply management unit 18 is connected to the output terminal of the second photovoltaic branch 1212; the output terminal of the fifth power supply management unit 18 is connected between the output terminal of the power supply battery branch 122 and the input terminal of the third power supply management unit 16.

[0140] In this embodiment, the fifth power supply management unit 18 may include an anti-backflow unit; or, it may include a switch unit and an anti-backflow unit, with the switch unit and the anti-backflow unit connected in series.

[0141] This disclosure provides a power supply circuit in which the output terminal of a second photovoltaic branch is connected between the power supply battery branch and the load of the energy storage submodule. In this case, the second power supply circuit can draw power from the second photovoltaic branch to provide DC power to the power supply battery branch, or it can draw power from the second photovoltaic branch to provide DC power to the load of the energy storage submodule, or it can draw power from the second photovoltaic branch to provide DC power to the power supply battery branch and / or the load of the energy storage submodule. Thus, when power is drawn from the second photovoltaic branch to supply power to the power supply battery branch, or when power is drawn from the power supply battery branch to supply power to the load of the energy storage submodule, continuous discharge of the power supply battery branch leading to over-discharge will not occur, improving power supply safety. Furthermore, drawing power from the second photovoltaic branch to supply power to the load of the energy storage submodule can also improve the utilization rate of the second photovoltaic branch.

[0142] In another embodiment of this disclosure, Figure 8 is a schematic diagram of an application scenario of a power supply circuit provided in this embodiment. As shown in Figure 8, the power supply circuit 10 may include a main power supply branch 81, a redundant power supply branch 82, a first power supply management unit 14, a second power supply management unit 15, a third power supply management unit 16, and a fourth power supply management unit 17. The main power supply branch 81 may include a high-voltage power extraction point 801 and a high-voltage energy extraction power source 802; the redundant power supply branch 82 may include a photovoltaic panel 803, a first shunt voltage regulator unit 804, and a redundant power supply battery 805. The photovoltaic panel 803 and the first shunt voltage regulator unit 804 constitute the first photovoltaic branch.

[0143] In this embodiment, the main power supply branch 81 is the first power supply circuit in the aforementioned embodiment, the redundant power supply branch 82 is the second power supply circuit in the aforementioned embodiment, the photovoltaic panel 803 can be the first photovoltaic unit in the aforementioned embodiment, the first shunt voltage regulator unit 804 can be the first voltage conversion unit in the aforementioned embodiment, the redundant power supply battery 805 can be the power supply battery branch in the aforementioned embodiment, and the high-voltage energy harvesting power supply 802 can be the energy harvesting unit in the aforementioned embodiment.

[0144] In this embodiment, the high-voltage power extraction point 801 is equivalent to the power supply interface in the previous embodiment. The input terminal of the high-voltage power extraction power supply 802 is connected to the high-voltage power extraction point 801, or in other words, the high-voltage power extraction point 801 is connected to the power supply interface. The output terminal of the high-voltage power extraction power supply 802 is connected to the input terminal of the first power supply management unit 14, and the output terminal of the first power supply management unit 14 is connected to the load 13 of the energy storage submodule. At this time, power can be extracted from the high-voltage power extraction point 801 and supplied to the load 13.

[0145] In this embodiment, the output terminal of the photovoltaic panel 803 is connected to the input terminal of the first shunt voltage regulator unit 804, the output terminal of the first shunt voltage regulator unit 804 is connected to the input terminal of the second power supply management unit 15, and the output terminal of the second power supply management unit 15 is connected to the load 13 of the energy storage submodule. At this time, power can be drawn from the photovoltaic panel 803 and supplied to the load 13. The output terminal of the first shunt voltage regulator unit 804 is also connected to the input terminal of the fourth power supply management unit 17, and the output terminal of the fourth power supply management unit 17 is connected to the redundant power supply battery 805, which is used to draw power from the photovoltaic panel 803 and supply power to the redundant power supply battery 805. The redundant power supply battery 805 is also connected to the input terminal of the third power supply management unit 16, and the output terminal of the third power supply management unit 16 is connected to the load 13 of the energy storage submodule. At this time, power can be drawn from the redundant power supply battery 805 and supplied to the load 13.

[0146] In this embodiment, the circuit structures of the first power management unit 14, the second power management unit 15, the third power management unit 16, and the fourth power management unit 17 can be identical. Specifically, the circuit structure may include an anti-backflow unit, as shown in Figure 4 above; the circuit structure may also include a switching unit and an anti-backflow unit, with the switching unit and the anti-backflow unit connected in series, as shown in Figure 5 above. In this way, the power management unit can have anti-backflow functionality, and the normal function of the power management unit is not affected when any diode experiences a short-circuit or open-circuit fault, resulting in high reliability of the power supply circuit. Furthermore, the power management unit may also include a switching unit, enabling it to also function as a switch for controlling each power supply branch to supply power to the load 13.

[0147] This disclosure provides a power supply circuit, specifically a dual-power supply circuit combining photovoltaic (PV) and battery power. The PV panels and / or batteries in the redundant power supply branch provide stable input power to the downstream loads of the energy storage submodule. In addition to the redundant power supply branch, a main power supply branch is also included. The high-voltage energy extraction point of the main power supply branch is an internal AC or DC high-voltage bus, and the power is converted to provide stable input power to the downstream loads of the energy storage submodule. Thus, in the event of an anomaly in the main power supply branch, the redundant power supply branch can provide power, ensuring uninterrupted power supply to the high-voltage energy storage system and improving the reliability of the power supply circuit.

[0148] In another embodiment of this disclosure, Figure 9 is a schematic diagram of a second application scenario of a power supply circuit provided in this embodiment. As shown in Figure 9, the power supply circuit 10 may include a main power supply branch 81 and a redundant power supply branch 82, a first power supply management unit 14, a second power supply management unit 15, a third power supply management unit 16, and a fifth power supply management unit 18. The main power supply branch 81 may include a high-voltage power extraction point 801 and a high-voltage energy extraction power source 802; the redundant power supply branch 82 may include a power supply photovoltaic panel 901, a charging photovoltaic panel 902, a first shunt voltage regulator unit 804, a second shunt voltage regulator unit 903, and a redundant power supply battery 805. Here, the power supply photovoltaic panel 901 and the first shunt voltage regulator unit 804 constitute the first photovoltaic branch, and the charging photovoltaic panel 902 and the second shunt voltage regulator unit 903 constitute the second photovoltaic branch. The first photovoltaic branch and the second photovoltaic branch together constitute the photovoltaic branch.

[0149] In this embodiment, the power supply photovoltaic panel 901 can be the first photovoltaic unit in the aforementioned embodiment, the charging photovoltaic panel 902 can be the second photovoltaic unit in the aforementioned embodiment, and the second shunt voltage regulator unit 903 can be the second voltage conversion unit in the aforementioned embodiment.

[0150] In this embodiment, the output terminal of the power supply photovoltaic panel 901 is connected to the input terminal of the first shunt voltage regulator unit 804, the output terminal of the first shunt voltage regulator unit 804 is connected to the input terminal of the second power supply management unit 15, and the output terminal of the second power supply management unit 15 is connected to the load 13 of the energy storage submodule. Power can then be drawn from the power supply photovoltaic panel 901 to supply power to the load 13. The output terminal of the charging photovoltaic panel 902 is connected to the input terminal of the second shunt voltage regulator unit 903, the output terminal of the second shunt voltage regulator unit 903 is connected to the input terminal of the fifth power supply management unit 18, and the output terminal of the fifth power supply management unit 18 is connected to the redundant power supply battery 805. Power can then be drawn from the charging photovoltaic panel 902 to supply power to the redundant power supply battery 805. The redundant power supply battery 805 is also connected to the input terminal of the third power supply management unit 16, and the output terminal of the third power supply management unit 16 is connected to the load 13 of the energy storage submodule, used to draw power from the redundant power supply battery 805 to supply power to the load 13.

[0151] In this embodiment of the disclosure, the circuit structures of the first power management unit 14, the second power management unit 15, the third power management unit 16 and the fifth power management unit 18 may be the same or different, and no specific limitation is made.

[0152] In one specific embodiment, the power supply management unit has the structure shown in Figure 4. The power supply management unit can control each power supply branch, specifically using voltage difference to compete for power supply, designing the output voltage of each branch, and determining the power supply priority of each power supply branch.

[0153] For example, the power supply priority of each branch is set as follows: main power supply branch > (power supply photovoltaic panel) > charging photovoltaic panel > redundant power supply battery. If the main power supply branch is fault-free (i.e., working normally), the main power supply branch supplies power to the load (mode 1); when the main power supply branch is faulty and the sunlight is good with sufficient photovoltaic output, the power supply photovoltaic panel supplies power to the load, while the charging photovoltaic panel charges the redundant power supply battery (mode 2); if the main power supply branch is faulty and the sunlight is weak with insufficient photovoltaic output, the redundant power supply battery supplies power to the load (mode 3); when the sunlight is good, it switches to mode 2, and the power supply photovoltaic panel continues to supply power to the load. Here, photovoltaic output can refer to the electrical power output of the photovoltaic panel.

[0154] In this embodiment, the photovoltaic panel is managed hierarchically. The output voltage difference is adjusted based on the hierarchical architecture of the photovoltaic panel, and the power supply priority of each branch is controlled. This makes the structure and control of the power supply circuit simpler, and the power supply response is fast, thus improving the economy of the power supply circuit.

[0155] For example, based on dividing the photovoltaic panel into a power supply photovoltaic panel and a charging photovoltaic panel, the output voltage of the power supply photovoltaic panel is adjusted to 26V and the output voltage of the redundant power supply battery is adjusted to 24V. When there is sufficient light, the 26V power supply is given priority. That is, when the main power supply branch fails, the power supply photovoltaic panel gives priority to supplying power to the load.

[0156] This disclosure provides a power supply circuit, specifically a three-way power supply circuit based on a power supply photovoltaic panel, a charging photovoltaic panel, and a power supply battery. This redundant power supply branch allows for functional division of labor among the photovoltaic panels, ensuring that the redundant power supply battery will not continuously deplete to the point of over-discharge under certain weather conditions. In addition to the redundant power supply branch, the high-voltage energy extraction point of the main power supply branch is an internal AC or DC high-voltage bus, which, after high-voltage power conversion, provides stable power input to the downstream load of the energy storage submodule. Thus, when the main power supply branch experiences an anomaly, the redundant power supply branch can provide power, ensuring uninterrupted power supply to the high-voltage energy storage system and improving the reliability of the power supply circuit.

[0157] In another embodiment of this disclosure, based on the power supply circuit of the foregoing embodiments, FIG10 is a schematic flowchart of a power supply control method provided by an embodiment of this disclosure. As shown in FIG10, the method may include:

[0158] S1001, Obtain the electrical power output from the first power supply circuit.

[0159] S1002, when it is determined that the power output of the first power supply circuit is lower than the first preset threshold, a first control signal is generated.

[0160] S1003, based on the first control signal, controls the second power supply circuit to supply power to the load of the energy storage submodule.

[0161] In this embodiment, the method is applied to the power supply circuit of the aforementioned embodiment. The power supply circuit includes a first power supply circuit and a second power supply circuit. The output terminals of both the first and second power supply circuits are connected to the load of the energy storage submodule and are capable of outputting DC power to the load of the energy storage submodule. Here, the first preset threshold can characterize the electrical power required by the load of the energy storage submodule, or it can characterize whether the first power supply circuit is supplying power normally. The first preset threshold can be determined according to actual conditions.

[0162] Thus, when the output power of the first power supply circuit is determined to be lower than a first preset threshold, a first control signal can be generated; then, based on the first control signal, the second power supply circuit is controlled to supply power to the load of the energy storage submodule. Since the first and second power supply circuits in this disclosure are redundant, when the power output of the first power supply circuit is insufficient to supply power to the load, the second power supply circuit can be used to supply power to the load of the energy storage submodule. This ensures uninterrupted power supply to the high-voltage energy storage system, improves the reliability of the power supply, and consequently enhances the safety of the high-voltage energy storage system.

[0163] In this embodiment of the disclosure, the second power supply circuit may include a photovoltaic branch and a power supply battery branch, and the photovoltaic branch may include the first photovoltaic branch. In some embodiments, controlling the second power supply circuit to supply power to the load of the energy storage submodule based on a first control signal includes: acquiring the electrical power output of the first photovoltaic branch; generating a second control signal when it is determined that the electrical power output of the first photovoltaic branch is lower than a second preset threshold; and controlling the power supply battery branch to provide the required shortfall power based on the second control signal, so as to jointly supply power to the load of the energy storage submodule with the first photovoltaic branch.

[0164] In this embodiment, the second preset threshold can characterize the electrical power required by the load of the energy storage submodule. By comparing the electrical power of the first photovoltaic branch with the second preset threshold, it can be determined whether the second photovoltaic branch can maintain the normal operation of the load. If it cannot maintain the operation of the load, the power supply battery branch and the first photovoltaic branch are controlled to jointly supply power to the load.

[0165] Thus, in this embodiment, when the power of the first photovoltaic branch is lower than the second preset threshold, it indicates that the first photovoltaic branch cannot maintain the normal operation of the energy storage submodule load. At this time, a second control signal is generated and the power supply battery branch is controlled to provide the insufficient power based on the second control signal. Then, the first photovoltaic branch and the power supply battery branch jointly supply power to the energy storage submodule to maintain the normal operation of the energy storage submodule load. This can ensure uninterrupted power supply to the high-voltage energy storage system, thereby improving the reliability and safety of power supply.

[0166] In this embodiment, the power supply circuit may include a first power supply management unit, a second power supply management unit, and a third power supply management unit. The first power supply management unit is connected between the output terminal of the first power supply circuit and the load of the energy storage submodule; the second power supply management unit is connected between the output terminal of the first photovoltaic branch and the load of the energy storage submodule; and the third power supply management unit is connected between the output terminal of the power supply battery branch and the load of the energy storage submodule. Each of the first, second, and third power supply management units includes a switching unit, and the switching unit has a switching function (i.e., turning on or off).

[0167] In some embodiments, controlling the power supply battery branch to provide the required underpowered power based on the second control signal to jointly supply power to the load of the energy storage submodule with the first photovoltaic branch may include: controlling the second power supply management unit and the third power supply management unit to be turned on based on the second control signal, and controlling the first power supply management unit to be turned off, so that the power supply battery branch and the first photovoltaic branch jointly supply power to the load of the energy storage submodule.

[0168] Thus, in this embodiment of the disclosure, based on the second control signal, the second power supply management unit and the third power supply management unit are controlled to be turned on, and the first power supply management unit is controlled to be turned off, so that the power supply battery branch and the first photovoltaic branch jointly supply power to the load of the energy storage submodule, so as to maintain the normal operation of the load of the energy storage submodule. This can ensure uninterrupted power supply to the high-voltage energy storage system, thereby improving the reliability and safety of power supply.

[0169] In some embodiments, the method further includes: generating a third control signal when it is determined that the electrical power output of the first photovoltaic branch is higher than a second preset threshold; and controlling the first photovoltaic branch to supply power to the load and / or power supply battery branch of the energy storage submodule based on the third control signal.

[0170] Thus, in this embodiment of the present disclosure, when the power of the first photovoltaic branch is higher than the second preset threshold, it indicates that the first photovoltaic branch can maintain the normal operation of the load of the energy storage submodule. At this time, a third control signal is generated, and the first photovoltaic branch is controlled to supply power to the power supply battery branch and / or the energy storage submodule based on the third control signal. This can ensure uninterrupted power supply to the high-voltage energy storage system, thereby improving the reliability and safety of power supply, and also improving the utilization rate of the first photovoltaic branch.

[0171] In this embodiment, the power supply circuit may further include a fourth power supply management unit. One end of the fourth power supply management unit is connected between the first photovoltaic branch and the second power supply management unit, and the other end of the fourth power supply management unit is connected between the power supply battery branch and the third power supply management unit. The fourth power supply management unit includes a switching unit, and the switching unit has a switching function (i.e., turning on or off).

[0172] In some embodiments, controlling the first photovoltaic branch to supply power to the load and / or power supply battery branch of the energy storage submodule based on a third control signal includes: controlling the second power supply management unit to turn on and controlling the first power supply management unit, the third power supply management unit, and the fourth power supply management unit to turn off, so that the first photovoltaic branch supplies power to the load of the energy storage submodule; or, controlling the fourth power supply management unit to turn on and controlling the first power supply management unit, the second power supply management unit, and the third power supply management unit to turn off, so that the first photovoltaic branch supplies power to the power supply battery branch; or, controlling the second power supply management unit and the fourth power supply management unit to turn on and controlling the first power supply management unit and the third power supply management unit to turn off, so that the first photovoltaic branch supplies power to the load and power supply battery branch of the energy storage submodule.

[0173] Thus, in this embodiment, the first power supply management unit, the third power supply management unit, and the fourth power supply management unit are controlled to be on or off based on the third control signal, and power is supplied to the load of the energy storage submodule through the first photovoltaic branch, which can ensure uninterrupted power supply to the high-voltage energy storage system, thereby improving the reliability of power supply; or, power is supplied to the power supply battery branch through the first photovoltaic branch, which can provide sufficient power to the power supply battery to supply power to the load of the energy storage submodule, thereby improving the safety of power supply; or, power is supplied to both the power supply battery branch and the load of the energy storage submodule through the first photovoltaic branch, thereby improving the reliability and safety of power supply and improving the utilization rate of the first photovoltaic branch.

[0174] It should be noted that, in this embodiment of the present disclosure, when the second power supply circuit is used to supply power to the load, if the sunlight is good and the output of the first photovoltaic branch is sufficient, such that the power of the first photovoltaic branch is higher than the second preset threshold, the first photovoltaic branch is preferentially used to supply power to the load; if the sunlight is weak and the output of the first photovoltaic branch is insufficient, such that the power of the first photovoltaic branch is lower than the second preset threshold, if the power output of the power supply battery branch can meet the power required for the normal operation of the load, the power supply battery branch will supply power; if the power output of the power supply battery branch cannot meet the power required for the normal operation of the load, the first photovoltaic branch and the power supply battery branch will jointly supply power to the load to maintain the normal operation of the load.

[0175] In some embodiments, the method may further include: generating a fifth control signal when it is determined that the electrical power output by the first power supply circuit is higher than a first preset threshold; and controlling the first power supply circuit to supply power to the load of the energy storage submodule based on the fifth control signal.

[0176] In this embodiment, the first power management unit is turned on based on the fifth control signal, while other power management units are turned off, so that the first power management unit supplies power to the load. Alternatively, the fourth power management unit can be turned on to charge the first photovoltaic branch to ensure that the battery branch has sufficient power to supply power to the load, thus improving the utilization rate of the photovoltaic branch.

[0177] In this embodiment of the disclosure, when the power output of the first power supply circuit is higher than the first preset threshold, it indicates that the first power supply circuit can maintain the operation of the energy storage submodule. At this time, a fifth control signal is generated, and the first power supply circuit is controlled to supply power to the load of the energy storage submodule according to the fifth control signal, so as to ensure the normal operation of the high-voltage energy storage system and improve the reliability and safety of power supply.

[0178] This disclosure provides a power supply control method applied to a power supply circuit, which includes a first power supply circuit and a second power supply circuit. When the power output of the first power supply circuit is lower than a first preset threshold, a first control signal is generated. Based on this first control signal, the second power supply circuit can be controlled to supply power to the load of the energy storage submodule. Thus, when the power output of the first power supply circuit is insufficient or when there is an abnormality in the first power supply circuit, the second power supply circuit can supply power to the load of the energy storage submodule, thereby ensuring uninterrupted power supply to the high-voltage energy storage system and improving power supply reliability.

[0179] In another embodiment of this disclosure, the power supply circuit may include a first power supply circuit and a second power supply circuit; the second power supply circuit includes a photovoltaic branch and a power supply battery branch, and the photovoltaic branch includes a first photovoltaic branch and a photovoltaic branch. The method further includes: acquiring the electrical power output of the second photovoltaic branch; when it is determined that the electrical power output of the second photovoltaic branch is higher than a third preset threshold, generating a fourth control signal; and controlling the second photovoltaic branch to supply power to the load of the power supply battery branch and / or the energy storage submodule based on the fourth control signal.

[0180] In this embodiment of the disclosure, the power supply circuit may include a first power supply management unit, a second power supply management unit, and a third power supply management unit. Each of the first power supply management unit, the second power supply management unit, and the third power supply management unit includes a switching unit, and the switching unit has a switching function (i.e., turning on or off).

[0181] In some embodiments, controlling the second photovoltaic branch to supply power to the load of the power supply battery branch and / or the energy storage submodule based on the fourth control signal includes: controlling the fifth power management unit to be turned on and the third power management unit to be turned off based on the fourth control signal, so that the second photovoltaic branch supplies power to the power supply battery branch; or, controlling the fifth power management unit and the third power management unit to be turned on, so that the second photovoltaic branch supplies power to the load of the energy storage submodule; or, controlling the fifth power management unit and the third power management unit to be turned on, so that the second photovoltaic branch supplies power to the load of the power supply battery branch and the energy storage submodule.

[0182] Thus, in this embodiment of the disclosure, the third and fifth power supply management units are controlled to be on or off based on the fourth control signal, and power is supplied to the load of the energy storage submodule through the second photovoltaic branch, which can ensure uninterrupted power supply to the high-voltage energy storage system, thereby improving the reliability of power supply; or, power is supplied to the power supply battery branch through the second photovoltaic branch, which can avoid over-discharge caused by continuous discharge of the power supply battery branch, thereby improving the safety of power supply; or, power is supplied to the load of the power supply battery branch and the energy storage submodule through the second photovoltaic branch, which improves the reliability and safety of power supply and increases the utilization rate of the second photovoltaic branch.

[0183] In this embodiment, when the power output of the first power supply circuit is higher than a first preset threshold, it indicates that the first power supply circuit can maintain the operation of the energy storage submodule. At this time, based on the fifth control signal, the first power supply management unit can be turned on to enable the first power supply circuit to supply power to the load of the energy storage submodule, thereby ensuring the normal operation of the high-voltage energy storage system and improving the reliability and safety of the power supply. Alternatively, the fifth power supply management unit can be turned off based on the fifth control signal to enable the second photovoltaic branch to charge the power supply battery branch, ensuring that the power supply battery branch has sufficient power to supply power to the load, thus improving the utilization rate of the photovoltaic branch.

[0184] This disclosure provides a power supply control method. When the power of the second photovoltaic branch is higher than a third preset threshold, it indicates that the second photovoltaic branch is able to supply power to the battery branch and / or energy storage submodule and is operating normally. At this time, a third control signal is generated, and the second photovoltaic branch is controlled to supply power to the battery branch and / or energy storage submodule based on the third control signal. This can ensure uninterrupted power supply to the high-voltage energy storage system, improve the reliability of power supply, and also avoid over-discharge caused by continuous discharge of the battery branch, thereby improving power supply safety.

[0185] In another embodiment of this disclosure, FIG11 is a detailed flowchart of a power supply control method provided in this embodiment. This detailed flowchart is applied to a power supply circuit as shown in FIG8 above. The first power supply management unit includes a first switch, the second power supply management unit includes a second switch, the third power supply management unit includes a third switch, and the fourth power supply management unit includes a fourth switch. As shown in FIG11, the detailed flowchart may include:

[0186] S1101, Begin.

[0187] S1102, Initial state: First switch closed, second, third and fourth switches open.

[0188] S1103, is the main power supply branch normal?

[0189] In this embodiment of the disclosure, if the judgment result of step S1103 is yes, then step S1104 is executed; if the judgment result of step S1103 is no, then step S1107 is executed. Furthermore, when the judgment result of step S1103 is yes, the load is powered by the main power supply branch.

[0190] S1104, is the photovoltaic output sufficient?

[0191] In this embodiment of the disclosure, if the judgment result of step S1104 is yes, then step S1105 is executed; if the judgment result of step S1104 is no, then step S1104 is continued to be executed.

[0192] S1105: Keep the second and third switches open, close the first switch, close the fourth switch, and the photovoltaic panel charges the redundant power supply battery.

[0193] S1106, charging time x hours.

[0194] In this embodiment of the disclosure, after charging for x hours, step S1104 needs to be performed.

[0195] S1107: Close the third switch, the redundant power supply battery provides emergency power, and the first switch is disconnected.

[0196] S1108, Does the photovoltaic output meet the requirements of joint power supply?

[0197] In this embodiment of the disclosure, if the judgment result of step S1108 is yes, then step S1109 is executed; if the judgment result of step S1108 is no, then step S1108 is continued to be executed.

[0198] S1109: Keep the third switch closed, open the first switch, close the second switch, and the photovoltaic panel and redundant power supply battery work together to provide power.

[0199] S1110, does the photovoltaic output meet the requirements of dual power supply?

[0200] In this embodiment of the disclosure, if the judgment result of step S1110 is yes, then step S1111 is executed; if the judgment result of step S1110 is no, then step S1108 is executed.

[0201] S1111: Keep the second switch closed and the first switch open; open the third switch and close the fourth switch to charge the load and redundant power supply battery via the photovoltaic panel.

[0202] S1112, after charging for x hours, keep the second switch closed, open the fourth switch, and close the third switch.

[0203] In this embodiment of the disclosure, after step S1112 is completed, step S1108 is executed.

[0204] This disclosure provides a power supply control method. The specific implementation of the aforementioned embodiments has been described in detail through the above embodiments. It can be seen that by prioritizing each power supply branch through switches in the power supply management unit, specifically, the power supply priority of each branch is: main power supply branch > photovoltaic branch > power supply battery branch. This ensures uninterrupted power supply to the high-voltage energy storage system, improves power supply reliability, and guarantees the stable charge of redundant power supply batteries.

[0205] In another embodiment of this disclosure, if the power supply circuit is located indoors, a certain number of supplementary lights can be installed on the top of the valve hall. When the first power supply circuit fails, the existing redundant power supply battery provides emergency power, and at the same time, the valve control system mobilizes light sources to supplement the energy storage submodule that is faulty (i.e., to provide illumination for the photovoltaic branch). This can effectively solve the problem of redundant power supply in indoor high-voltage cascade systems.

[0206] In this embodiment, according to State Grid specifications, high-voltage cascaded energy storage systems require redundant power supply configurations. High-voltage cascaded energy storage systems in indoor valve halls also face the problem of cross-module power extraction. The power supply circuit provided in this embodiment can be applied to indoor valve halls, where high-power supplementary lighting is installed. Specifically, a certain number of portable supplementary lighting units can be installed in the valve hall design. In the event of a failure in the first power supply circuit (i.e., main power supply) of an energy storage submodule, the redundant power supply battery provides emergency power first, and then the supplementary lighting units provide illumination to the photovoltaic branch to power the load of the energy storage submodule. Simultaneously, the portable supplementary lighting units need to periodically charge the redundant power supply battery. This effectively solves the problem of redundant power supply in indoor cascaded high-voltage systems.

[0207] In another embodiment of this disclosure, FIG12 is a schematic diagram of the composition structure of a high-voltage energy storage system provided in this embodiment. As shown in FIG12, the high-voltage energy storage system 120 may include at least one energy storage submodule.

[0208] In this embodiment, the high-voltage energy storage system 120 can be a high-voltage DC direct-connected energy storage valve. At least one energy storage submodule in the high-voltage energy storage system 120 is a cascaded structure; the energy storage submodule can also be called an "energy storage valve submodule" or "energy storage valve module," therefore the high-voltage energy storage system 120 can also be called a cascaded high-voltage energy storage system.

[0209] In this embodiment of the disclosure, as shown in Figure 12, it is assumed that the high-voltage energy storage system 120 may include n energy storage sub-modules (energy storage sub-module 1, energy storage sub-module 2, ..., energy storage sub-module n). These n energy storage sub-modules are typically stacked to form a cascaded high-voltage energy storage system. Here, n is a positive integer. It should be noted that the cascaded high-voltage energy storage system can exist in the form of containers. One energy storage sub-module can be placed inside one container, and n containers can be stacked to obtain the cascaded high-voltage energy storage system.

[0210] In this embodiment, to address the power supply reliability issue of cascaded high-voltage energy storage systems, a power supply circuit can be provided for each energy storage submodule to ensure the power supply reliability of the cascaded high-voltage energy storage system. Simultaneously, it ensures that if the main power supply branch of an energy storage submodule malfunctions, the redundant power supply branch can support the power consumption of the energy storage submodule during prolonged periods of inactivity. Here, in the cascaded high-voltage energy storage system, assuming one energy storage submodule malfunctions, it will bypass this submodule. However, the cascaded high-voltage energy storage system will not stop operating; continuous monitoring of the cascaded high-voltage energy storage system is required to ensure safety. That is, the various functions of the control board in the faulty energy storage submodule still need to operate. Therefore, redundant power supply branches are needed to support the power consumption of the energy storage submodule during prolonged periods of inactivity.

[0211] In this embodiment of the disclosure, each energy storage submodule in Figure 12 may include a power supply circuit. Here, if the first power supply branch is functioning normally, it can supply power to the downstream load of the energy storage submodule. If a short circuit occurs in the first power supply branch, the photovoltaic branch and / or the battery branch in the second power supply branch can provide redundant power to the downstream load of the energy storage submodule, thereby improving the reliability of the power supply. Furthermore, this ensures that the second power supply circuit supports the energy consumption of the energy storage submodule during its long-term static operation after the first power supply circuit of the energy storage submodule fails, improving the safety of the high-voltage energy storage system 120.

[0212] In yet another embodiment of this disclosure, a computer-readable storage medium is provided having a computer program stored thereon that, when executed, implements the power supply control method of any of the foregoing embodiments.

[0213] In yet another embodiment of this disclosure, a computer program product is also provided, including a computer program or instructions that, when executed, implement the power supply control method as described in any of the foregoing embodiments.

[0214] Those skilled in the art will understand that embodiments of this disclosure can be provided as methods, apparatus, devices, or computer program products. Therefore, this disclosure can take the form of hardware embodiments, software embodiments, or embodiments combining software and hardware aspects. Furthermore, this disclosure can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage and optical storage) containing computer-usable program code.

[0215] This disclosure is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this disclosure. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in one or more flowchart illustrations and / or one or more block diagrams.

[0216] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means that implement the functions specified in one or more flowcharts and / or one or more block diagrams.

[0217] These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, such that the instructions, which execute on the computer or other programmable apparatus, provide steps for implementing the functions specified in one or more flowcharts and / or one or more block diagrams.

[0218] It should be noted that, in this disclosure, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, product, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, product, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes that element.

[0219] The sequence numbers of the embodiments disclosed above are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0220] The methods disclosed in the several method embodiments provided in this disclosure can be arbitrarily combined without conflict to obtain new method embodiments.

[0221] The features disclosed in the several product embodiments provided in this disclosure can be arbitrarily combined without conflict to obtain new product embodiments.

[0222] The features disclosed in the several method or device embodiments provided in this disclosure can be arbitrarily combined without conflict to obtain new method or device embodiments.

[0223] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A power supply circuit for a high-voltage energy storage system, the power supply circuit comprising: The first power supply circuit and the second power supply circuit are configured to output DC power to the load of the energy storage submodule; The output terminals of both the first power supply circuit and the second power supply circuit are connected to the load of the energy storage submodule; The input terminal of the first power supply circuit is configured to draw power from the high-voltage energy storage system. The second power supply circuit includes a photovoltaic branch, which is configured to be equipotentially connected to the energy storage submodule, and the input terminal of the second power supply circuit is configured to input DC power from the photovoltaic branch.

2. The power supply circuit according to claim 1, wherein, The second power supply circuit also includes a power supply battery branch, which is configured to be equipotentially connected to the energy storage submodule, and the input terminal of the second power supply circuit is also configured to input DC power from the power supply battery branch.

3. The power supply circuit according to claim 2, wherein, The photovoltaic branch includes a first photovoltaic branch; The first photovoltaic branch includes a first photovoltaic unit and a first voltage conversion unit, wherein the first voltage conversion unit is configured to convert the direct current output by the first photovoltaic unit into a first electrical power and output it.

4. The power supply circuit according to claim 3, wherein, The power supply circuit includes a first power supply management unit, a second power supply management unit, and a third power supply management unit; wherein, The first power supply management unit is connected between the output terminal of the first power supply circuit and the load of the energy storage submodule; The second power supply management unit is connected between the output terminal of the first photovoltaic branch and the load of the energy storage submodule; The third power supply management unit is connected between the output terminal of the power supply battery branch and the load of the energy storage submodule.

5. The power supply circuit according to claim 4, wherein, The power supply circuit also includes a fourth power supply management unit; wherein... One end of the fourth power supply management unit is connected between the output end of the first photovoltaic branch and the input end of the second power supply management unit; The other end of the fourth power supply management unit is connected between the output end of the power supply battery branch and the input end of the third power supply management unit.

6. The power supply circuit according to claim 4, wherein, The photovoltaic branch also includes a second photovoltaic branch; wherein... The output terminal of the second photovoltaic branch is connected between the power supply battery branch and the load of the energy storage submodule, and is configured to provide DC power to the power supply battery branch and / or the load of the energy storage submodule.

7. The power supply circuit according to claim 6, wherein, The second photovoltaic branch includes a second photovoltaic unit and a second voltage conversion unit. The second voltage conversion unit is configured to convert the DC power output by the second photovoltaic unit into a second electrical power and output it.

8. The power supply circuit according to claim 6 or 7, wherein, The power supply circuit also includes a fifth power supply management unit: wherein, The input terminal of the fifth power supply management unit is connected to the output terminal of the second photovoltaic branch; The output terminal of the fifth power supply management unit is connected between the output terminal of the power supply battery branch and the input terminal of the third power supply management unit.

9. The power supply circuit according to any one of claims 4 to 8, wherein, At least one of the first power supply management unit, the second power supply management unit, and the third power supply management unit includes an anti-backflow unit; or, it includes a switch unit and an anti-backflow unit, wherein the switch unit and the anti-backflow unit are connected in series.

10. The power supply circuit according to claim 9, wherein, The backflow prevention unit includes one backflow prevention element, or at least two backflow prevention elements connected in series, wherein the backflow prevention element includes at least two diodes connected in parallel.

11. The power supply circuit according to any one of claims 1 to 10, wherein, The power supply circuit also includes a light source device, which can provide illumination compensation to the photovoltaic branch. The light source device is configured to provide illumination compensation to the photovoltaic branch when the light source corresponding to the photovoltaic branch is less than a preset light source intensity.

12. A power supply control method, applied to a power supply circuit as described in any one of claims 1 to 11, the method comprising: Obtain the electrical power output from the first power supply circuit; When it is determined that the power output of the first power supply circuit is lower than a first preset threshold, a first control signal is generated; Based on the first control signal, the second power supply circuit is controlled to supply power to the load of the energy storage submodule.

13. The method according to claim 12, wherein, The step of controlling the second power supply circuit to supply power to the load of the energy storage submodule based on the first control signal includes: In the case where the second power supply circuit includes a photovoltaic branch and a power supply battery branch, and the photovoltaic branch includes a first photovoltaic branch, the power output of the first photovoltaic branch is obtained; When it is determined that the electrical power output of the first photovoltaic branch is lower than the second preset threshold, a second control signal is generated; Based on the second control signal, the power supply battery branch is controlled to provide the required underpowered power to supply power to the load of the energy storage submodule together with the first photovoltaic branch.

14. The method according to claim 13, wherein, The step of controlling the power supply battery branch to provide the required shortfall power based on the second control signal, so as to jointly supply power to the load of the energy storage submodule with the first photovoltaic branch, includes: Based on the second control signal, the second power supply management unit and the third power supply management unit are turned on, and the first power supply management unit is turned off, so that the power supply battery branch and the first photovoltaic branch jointly supply power to the load of the energy storage submodule.

15. The method according to claim 14, wherein, The method further includes: When it is determined that the electrical power output of the first photovoltaic branch is higher than the second preset threshold, a third control signal is generated; Based on the third control signal, the first photovoltaic branch is controlled to supply power to the load of the energy storage submodule and / or the power supply battery branch.

16. The method according to claim 15, wherein, The step of controlling the first photovoltaic branch to supply power to the load of the energy storage submodule and / or the power supply battery branch based on the third control signal includes: Based on the third control signal, the second power supply management unit is turned on, and the first, third, and fourth power supply management units are turned off, so that the first photovoltaic branch supplies power to the load of the energy storage submodule; or, the fourth power supply management unit is turned on, and the first, second, and third power supply management units are turned off, so that the first photovoltaic branch supplies power to the power supply battery branch; or, the second and fourth power supply management units are turned on, and the first and third power supply management units are turned off, so that the first photovoltaic branch supplies power to the load of the energy storage submodule and the power supply battery branch.

17. The method of claim 14, wherein, The method further includes: In the case where the photovoltaic branch also includes a second photovoltaic branch, the power output of the second photovoltaic branch is obtained, and when it is determined that the power output of the second photovoltaic branch is higher than a third preset threshold, a fourth control signal is generated; Based on the fourth control signal, the second photovoltaic branch is controlled to supply power to the load of the power supply battery branch and / or the energy storage submodule.

18. The method according to claim 17, wherein, The step of controlling the second photovoltaic branch to supply power to the load of the power supply battery branch and / or the energy storage submodule based on the fourth control signal includes: Based on the fourth control signal, the fifth power management unit is turned on, and the third power management unit is turned off, so that the second photovoltaic branch supplies power to the power supply battery branch; or, the fifth power management unit and the third power management unit are turned on, so that the second photovoltaic branch supplies power to the load of the energy storage submodule; or, the fifth power management unit and the third power management unit are turned on, so that the second photovoltaic branch supplies power to the power supply battery branch and the load of the energy storage submodule.

19. The method according to any one of claims 12 to 18, wherein, The method further includes: When it is determined that the electrical power output by the first power supply circuit is higher than the first preset threshold, a fifth control signal is generated; Based on the fifth control signal, the first power supply circuit is controlled to supply power to the load of the energy storage submodule.

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