Energy storage power station and control method thereof

Abstract

The invention relates to the technical field of black start, and discloses an energy storage power station and a control method thereof. The system comprises an energy storage subsystem which comprises an energy storage battery, an energy storage converter, a main transformer and a high-voltage switch cabinet; an auxiliary machine load and a power supply control subsystem thereof; the first power supply branch comprises an auxiliary transformer and a first switch, the auxiliary transformer is connected with the main transformer, and the first switch is connected with an auxiliary machine load and a power supply control subsystem thereof; the second power supply branch comprises an inversion module and a second switch, the inversion module is connected with the energy storage battery, and the second switch is connected with the auxiliary machine load and the power supply control subsystem thereof; in response to a first control signal generated when the power grid stops running, the first switch is switched off and the second switch is switched on; in response to a second control signal generated when the power grid is not stopped, the first switch is turned on and the second switch is turned off. By providing continuous and stable power supply for the auxiliary machine load of the energy storage power station, the energy storage power station is supported to supply power to the power grid black start, and reliable and safe power grid black start is realized.

Description

Technical Field

[0001] This application relates to the field of black-start technology, and in particular to an energy storage power station and its control method. Background Technology

[0002] Black start refers to a situation where the entire power grid system is shut down due to a fault, resulting in a complete power outage and a "black" state. Without relying on other networks, the system recovers by starting its own generators, which in turn start other generators that lack self-starting capabilities, gradually expanding the recovery range until the entire system is restored. Energy storage power stations, as active energy storage devices, are particularly well-suited for use as black start power sources.

[0003] However, although various energy storage black start schemes have been proposed to utilize energy storage power stations as black start power sources for the power grid, these schemes have overlooked the following problem: when the power grid system enters a "black" state, the auxiliary systems of the energy storage power station will also lose power and become paralyzed. The energy storage power station cannot maintain normal operation, and the power grid cannot use the energy storage power station as a black start power source for black start. Summary of the Invention

[0004] This application addresses the technical problem of energy storage power stations being unable to provide power for grid black start due to the paralysis of auxiliary systems caused by power loss in "black" states. It provides an energy storage power station and its control method, which provides a continuous and stable power supply to the auxiliary loads of the energy storage power station, enabling the auxiliary systems of the energy storage power station to maintain normal operation in "black" states, thereby supporting the energy storage power station to provide power for grid black start and achieving reliable and safe grid black start.

[0005] This application provides an energy storage power station, comprising: an energy storage subsystem including an energy storage battery, an energy storage converter, a main transformer, and a high-voltage switchgear connected in sequence; an auxiliary load and its power supply control subsystem; a first power supply branch including an auxiliary transformer and a first switch connected in sequence, the auxiliary transformer being connected to the main transformer, and the first switch being connected to the auxiliary load and its power supply control subsystem; and a second power supply branch including an inverter module and a second switch connected in sequence, the inverter module being connected to the energy storage battery, and the second switch being connected to the auxiliary load and its power supply control subsystem; wherein, in response to a first control signal generated when the power grid is out of service, the first switch is open and the second switch is closed; in response to a second control signal generated when the power grid is not out of service, the first switch is closed and the second switch is open.

[0006] This application also provides a control method for an energy storage power station, used to control the energy storage power station provided in this application. The method includes: acquiring a real-time electrical signal on a first power supply branch; detecting whether the power grid is out of service based on the real-time electrical signal on the first power supply branch; if a power grid outage is detected, generating a first control signal and sending the first control signal to a first switch and a second switch, wherein the first control signal is used to instruct the first switch to be open and instruct the second switch to be on; if a power grid is not out of service, generating a second control signal and sending the second control signal to the first switch and the second switch, wherein the second control signal is used to instruct the first switch to be on and instruct the second switch to be open.

[0007] The technical solution provided in this application has at least the following advantages: The auxiliary transformer in the first power supply branch is connected to the main transformer, and the first switch is connected to the auxiliary load and its power supply control subsystem. Therefore, when the power grid is not shut down, in response to the second control signal generated when the power grid is not shut down, the first switch is turned on and the second switch is turned off. The electrical energy from the power grid transmitted from the high-voltage switchgear and the main transformer will be converted to the required state through the auxiliary transformer in the first power supply branch and transmitted to the auxiliary load and its power supply control subsystem, thereby powering the auxiliary load of the energy storage power station. Furthermore, the inverter module in the second power supply branch is connected to the energy storage battery, and the second switch is connected to the auxiliary load and its power supply control subsystem. Therefore, when the power grid is shut down, in response to the first control signal generated when the power grid is shut down, the first switch is turned off and the second switch is turned on. The electrical energy from the energy storage battery will be converted to the required state through the inverter module in the second power supply branch and transmitted to the auxiliary load and its power supply control subsystem, thereby powering the auxiliary load of the energy storage power station. Therefore, regardless of whether the power grid is out of service, there is always a conducting power supply branch through the first and second power supply branches to transmit the energy from the energy storage battery to the auxiliary load and its power supply control subsystem, and to supply power to the auxiliary load of the energy storage power station. This achieves a continuous and stable power supply to the auxiliary load of the energy storage power station, and ultimately ensures that the power supply to the auxiliary load of the energy storage power station is uninterrupted even when the power grid is out of service, and always maintains normal operation. This supports the energy storage power station in providing power for the black start of the power grid, provides a fundamental guarantee for the black start of the energy storage power station and the power grid, and achieves a reliable and safe black start of the power grid. Attached Figure Description

[0008] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0009] Figure 1 This is a schematic diagram of the structure of an energy storage power station provided in one embodiment of this application; Figure 2 This is a schematic diagram of the structure of an energy storage power station with an inverter provided in another embodiment of this application; Figure 3 This is a schematic diagram of the structure of an energy storage power station connected to a sampling plate and a first power supply branch, provided in another embodiment of this application; Figure 4 This is a schematic diagram of the structure of an energy storage power station with a third switch and a fourth switch provided in another embodiment of this application; Figure 5 This is a schematic diagram of the structure of an energy storage power station provided in another embodiment of this application, in which the sampling plate is connected to the first power supply branch and the second power supply branch respectively; Figure 6 This is a schematic diagram of the structure of an energy storage power station with a power supply control power source provided in another embodiment of this application; Figure 7 This is a schematic diagram of an energy storage power station with a fifth switch provided in another embodiment of this application; Figure 8 This is a schematic diagram of the structure of an energy storage power station with a sixth switch provided in another embodiment of this application; Figure 9 This is a flowchart of a control method for an energy storage power station provided in another embodiment of this application; Figure 10 This is a flowchart of a control method for an energy storage power station, including detecting whether maintenance steps are required, provided in another embodiment of this application; Figure 11 This is a flowchart of a control method for an energy storage power station, including determining grid restoration steps, provided in another embodiment of this application; Figure 12 This is a partial structural schematic diagram of an energy storage power station provided in another embodiment of this application; Figure 13 yes Figure 12 Another partial structural schematic diagram of the energy storage power station provided in the illustrated embodiment; Figure 14 yes Figure 12 Another partial structural schematic diagram of the energy storage power station provided in the illustrated embodiment. Detailed Implementation

[0010] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the various embodiments of this application will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been presented in the various embodiments of this application to enable readers to better understand this application. However, the technical solutions claimed in this application can be implemented even without these technical details and various changes and modifications based on the following embodiments.

[0011] The division of the following embodiments is for ease of description and should not constitute any limitation on the specific implementation of this application. The various embodiments can be combined with and referenced by each other without contradiction.

[0012] As active energy storage equipment, energy storage power stations are often used as power sources for black starts in power grids. While various solutions have been proposed to restore the main grid's normal operation by supplying power to the grid via energy storage converters, these solutions all suffer from a critical flaw: when the grid completely loses power, the energy storage power station's auxiliary transformer also loses power. This paralyzes critical auxiliary systems that rely on this transformer for power (such as the battery cluster environmental control system, the energy storage converter's environmental control system, control units, and communications). Therefore, even if the energy storage batteries are fully charged, the entire energy storage power station is paralyzed due to the failure of these critical auxiliary systems, making it impossible to start the energy storage converter and battery system. Consequently, the energy storage power station cannot provide power for the grid's black start, rendering its black start capability useless.

[0013] In other words, existing energy storage black start systems generally lack a mechanism to provide continuous and stable power to critical auxiliary loads during the power grid loss and reconstruction process, which affects the reliability and safety of grid black start.

[0014] Based on this, this application provides an energy storage power station, the structure of which is as follows: Figure 1 As shown, it includes: The energy storage subsystem 100 includes an energy storage battery 101, an energy storage converter 102, a main transformer 103, and a high-voltage switchgear 104 connected in sequence. Auxiliary load and its power supply control subsystem 200; The first power supply branch 300 includes an auxiliary transformer 301 and a first switch 302 connected in sequence. The auxiliary transformer 301 is connected to the main transformer 103, and the first switch 302 is connected to the auxiliary load and its power supply control subsystem 200. The second power supply branch 400 includes an inverter module 401 and a second switch 402 connected in sequence. The inverter module 401 is connected to the energy storage battery 101, and the second switch 402 is connected to the auxiliary load and its power supply control subsystem 200. The inverter module 401 converts the received electrical energy into a preset state. In response to a first control signal generated when the power grid is out of service, the first switch 302 is turned off and the second switch 402 is turned on; in response to a second control signal generated when the power grid is not out of service, the first switch 302 is turned on and the second switch 402 is turned off.

[0015] In the aforementioned energy storage power station, the auxiliary transformer 301 in the first power supply branch 300 is connected to the main transformer 103, and the first switch 302 is connected to the auxiliary load and its power supply control subsystem 200. Therefore, when the power grid is not shut down, in response to the second control signal generated when the power grid is not shut down, the first switch 302 is turned on and the second switch 402 is turned off. The electrical energy of the energy storage battery 101 transmitted through the high-voltage switch cabinet 104 and the main transformer 103 will be converted to the required state through the auxiliary transformer 301 in the first power supply branch 300 and transmitted to the auxiliary load and its power supply control subsystem 200, thereby supplying power to the auxiliary load of the energy storage power station. (Of course, the above mainly uses the charging state of the energy storage battery 101 as an example. When the power grid is not shut down and the energy storage battery 101 is in the discharging state, the electrical energy provided by the energy storage battery 101 can still supply power to the auxiliary load and its power supply control subsystem 200 through the energy storage converter 102, the auxiliary transformer 301 and the first switch 302 in sequence.) Furthermore, the inverter module 401 of the second power supply branch 400 is connected to the energy storage battery 101, and the second switch 402 is connected to the auxiliary load and its power supply control subsystem 200. Therefore, when the power grid is shut down, in response to the first control signal generated when the power grid is shut down, the first switch 302 is opened and the second switch 402 is turned on. The electrical energy of the energy storage battery 101 will be converted to the required state through the inverter module 401 in the second power supply branch 400 and transmitted to the auxiliary load and its power supply control subsystem 200, thereby supplying power to the auxiliary load of the energy storage power station. Therefore, regardless of whether the power grid is out of service, through the first power supply branch 300 and the second power supply branch 400, there is always a conducting power supply branch that can transmit the electrical energy of the energy storage battery 101 to the auxiliary load and its power supply control subsystem 200, and supply power to the auxiliary load of the energy storage power station. This achieves a continuous and stable power supply to the auxiliary load of the energy storage power station. Ultimately, even when the power grid is out of service, the power supply to the auxiliary load of the energy storage power station can be guaranteed to be uninterrupted and maintain normal operation. This supports the energy storage power station in providing power for the black start of the power grid, provides a fundamental guarantee for the black start of the energy storage power station and the power grid, and achieves a reliable and safe black start of the power grid.

[0016] For ease of understanding Figure 1 The composition of the energy storage power station shown below will be explained.

[0017] The energy storage subsystem 100 is a structure in an energy storage power station used for grid connection. The energy storage battery 101, energy storage converter 102, main transformer 103 and high-voltage switchgear 104 are just examples. In some embodiments, the energy storage subsystem 100 may also include other structures.

[0018] For the energy storage battery 101, one energy storage battery 101 can be a battery rack, or one energy storage battery 101 can be a battery bank, etc. The embodiments of this application do not limit it, and can be flexibly set according to needs. Among them, a battery bank is composed of several battery racks.

[0019] The energy storage converter 102 can be any energy storage converter (Power Conversion System, PCS).

[0020] The main transformer 103 can be any transformer capable of converting the electrical energy output from the energy storage converter 102 into a state that meets the requirements for grid connection and converting the electrical energy transmitted from the grid through the high-voltage switchgear 104 into a state that meets the input requirements of the energy storage converter 102.

[0021] For high-voltage switchgear 104, it can be any high-voltage switchgear.

[0022] The auxiliary load and its power supply control subsystem 200 are used to supply power and control the power supply of key auxiliary loads in the energy storage power station. The auxiliary load and its power supply control subsystem 200 can supply power to one or a combination of the following loads: environmental control loads including high-voltage room environmental control loads, main transformer environmental control loads, energy storage converter environmental control loads, battery box environmental control loads, auxiliary transformer environmental control loads, and control loop loads, etc.

[0023] It should be noted that, in some embodiments, the auxiliary load and its power supply control subsystem 200 may further include several sub-modules, each sub-module including a portion of the auxiliary load and power supply control circuit, etc. Furthermore, in some cases, the energy storage power station provided in this application embodiment may also include other energy storage power stations. The sub-modules included in the auxiliary load and its power supply control subsystem 200 of the energy storage power station provided in this application embodiment may also be composed of auxiliary loads and power supply control circuits from other energy storage power stations. That is, the energy storage power station provided in this application embodiment can supply power to the auxiliary loads of this energy storage power station and other energy storage power stations, as well as other equipment that needs power in a "black" state, to support black start.

[0024] For the first power supply branch 300, the auxiliary transformer 301 and the first switch 302 are only examples. In some embodiments, the first power supply branch 300 may also include other structures.

[0025] The auxiliary transformer 301 can be any transformer capable of converting the electrical energy output from the main transformer 103 into the state required to supply power to the auxiliary load and its power supply control subsystem 200.

[0026] The first switch 302 can be any switch. In some embodiments, to achieve stable and reliable millisecond-level switching, the first switch 302 can be a static switch. Of course, the first switch 302 can also be other switches, such as static switches, mechanical switches, etc., which will not be described in detail here.

[0027] For the second power supply branch 400, the inverter module 401 and the second switch 402 are only examples. In some embodiments, the second power supply branch 400 may also include other structures.

[0028] The inverter module 401 can be any device capable of converting the electrical energy output from the energy storage battery 101 into the state required to power the auxiliary load and its power supply control subsystem 200. For example, in some embodiments, such as Figure 2 As shown, the inverter module 401 may include an inverter 411 and a transformer 421 connected in sequence. The inverter 411 is connected to the energy storage battery 101, and the transformer 421 is connected to the auxiliary load and its power supply control subsystem 200 through the second switch 402. This enables the function of converting the electrical energy output by the energy storage battery 101 into the state required to supply power to the auxiliary load and its power supply control subsystem 200 with a simple structure, which helps to reduce the cost of the energy storage power station.

[0029] The second switch 402 can be any switch. In some embodiments, to achieve stable and reliable millisecond-level switching, the second switch 402 can be a static switch. Of course, the second switch 402 can also be other switches. The switches mentioned here and thereafter can be any switches, including static switches, mechanical switches, etc., which will not be described in detail here.

[0030] It should be noted that by setting the first control signal and the second control signal, the first switch 302 or the second switch 402 is in the conducting state at any time, so that only the first power supply branch 300 or the second power supply branch 400 supplies power to the auxiliary load and its power supply control subsystem 200, maintaining the stability of the auxiliary load and its power supply control subsystem 200 and reducing the impact on the auxiliary load and its power supply control subsystem 200.

[0031] It should also be noted that this application does not limit the source of the first control signal and the second control signal. They can come from modules, devices or components with control functions inside the energy storage power station, or they can come from outside the energy storage power station, such as controllers independent of the energy storage power station. These will not be listed here.

[0032] In some embodiments, the second switch 402 may be interlocked with the first switch 302 so that there is always only one conducting power supply branch between the first power supply branch 300 and the second power supply branch 400, thereby eliminating the risk of current backflow.

[0033] In some embodiments, in order to accurately and reliably implement the on / off control logic of the second switch 402 and the first switch 302, such as Figure 3 As shown, the energy storage power station may also include a control subsystem 500. The control subsystem 500 is used to control the on / off state of the second switch 402 and the first switch 302.

[0034] In some embodiments, the control subsystem 500 may include a sampling board 501 and a controller 502 connected in sequence. The sampling board 501 is connected to the first power supply branch 300 to collect electrical signals on the first power supply branch 300. The controller 502 is connected to the first switch 302 and the second switch 402 respectively to control the first switch 302 and the second switch 402 to be turned on or off according to the electrical signals collected by the sampling board 501. At this time, it is possible to detect whether the power grid is out of service by collecting electrical signals on the first power supply branch 300; when the power grid is out of service, a first control signal is generated and sent to the first switch 302 and the second switch 402; or, when the power grid is not out of service, a second control signal is generated and sent to the first switch 302 and the second switch 402, thereby achieving precise control over whether the first switch 302 and the second switch 402 are turned on or off, so that the energy storage power station can switch to the auxiliary load power supply mode more stably and quickly in the "blackout" state, better maintain the continuous and stable operation of the auxiliary load, and at the same time reduce the impact on the auxiliary load and its power supply control subsystem 200. This enables energy storage power stations to supply power for grid black starts, providing fundamental protection for the black starts of both energy storage power stations and the power grid, and achieving reliable and safe grid black starts.

[0035] Of course, the above is only an example of implementing the conduction control of the second switch 402 and the first switch 302. In some embodiments, it can also be achieved through remote commands, automatic switching, automatic switching, delay settings, external node startup, etc., which will not be listed here.

[0036] It should be noted that this application does not limit the specific form of the electrical signal collected by the sampling board 501. It can collect any information that can reflect whether there is an abnormality in the state of the electrical signal on the object being collected, such as voltage, frequency, and phase angle. These will not be listed here.

[0037] It should also be noted that this application does not limit the specific connection position of the sampling board 501 on the first power supply branch 300 and / or the second power supply branch 400. In some embodiments, such as Figure 3 As shown, the sampling board 501 can be connected to the first power supply branch 300 at a position after the auxiliary transformer 301 and before the first switch 302, ensuring that the switching of the first switch 302 does not affect the acquisition of electrical signals on the first power supply branch 300, thus guaranteeing the stability of the acquisition of electrical signals on the first power supply branch 300. In some embodiments, the sampling board 501 can be connected to the first power supply branch 300 at a position before the auxiliary transformer 301. In some embodiments, the sampling board 501 can be connected to the second power supply branch 400 at a position after the inverter module 401 and before the second switch 402, ensuring that the switching of the second switch 402 does not affect the acquisition of electrical signals on the second power supply branch 400, thus guaranteeing the stability of the acquisition of electrical signals on the second power supply branch 400. In some embodiments, the sampling board 501 can be connected to the second power supply branch 400 at a position before the inverter module 401, etc., which will not be listed here.

[0038] In some embodiments, such as Figure 4 As shown, the first power supply branch 300 also includes a third switch 303, and both the first switch 302 and the sampling board 501 are connected to the auxiliary transformer 301 through the third switch 303. Therefore, the first power supply branch 300 can be switched on and off by controlling the third switch 303.

[0039] In some embodiments, such as Figure 4 As shown, the first power supply branch 300 also includes a fourth switch 304. One end of the fourth switch 304 is connected to the auxiliary transformer 301, and the other end is connected to the auxiliary load and its power supply control subsystem 200. Thus, the fourth switch 304 provides a maintenance bypass branch for the power supply path of the auxiliary load and its power supply control subsystem 200. When the first switch 302, the second switch 402, or the inverter module 401 needs maintenance or malfunctions, the fourth switch 304 can be turned on, and the first switch 302 and the second switch 402 can be turned off. This allows the electrical energy output from the auxiliary transformer 301 to directly power the auxiliary load and its power supply control subsystem 200 through the current path of the fourth switch 304. This enables safe maintenance or replacement of the first and second power supply branches without affecting the overall operation of the power station, significantly improving the availability and maintainability of the energy storage power station.

[0040] In some embodiments, such as Figure 5As shown, the sampling board 501 is also connected to the inverter module 401 to collect the electrical signals of the output signal of the inverter module 401. Thus, the sampling board 501 can simultaneously collect the electrical signals on the first power supply branch 300 and the second power supply branch 400 and provide them to the controller 502, so that the controller 502 can make more accurate and reliable decisions to further reduce the risk of auxiliary load power failure.

[0041] It should be noted that the electrical signal collected by the sampling board 501 from the inverter module 401 is roughly the same as the electrical signal collected by the sampling board 501 from the first power supply branch 300 mentioned above. The main difference is that the source of the electrical signal is different, which has been described before and will not be repeated here.

[0042] In some embodiments, such as Figure 6 As shown, the energy storage power station also includes a third power supply branch 600, which includes a switching power supply 601 and a power supply control power supply 602. In some examples, the switching power supply 601 may include a first switching power supply 611 and / or a second switching power supply 621.

[0043] When a first switching power supply 611 is provided, the input terminal of the first switching power supply 611 is connected to the first power supply branch 300 and the output terminal is connected to the power supply control power supply 602, so as to convert the electrical signal on the first power supply branch 300 into the required voltage status signal and transmit it to the power supply control power supply 602.

[0044] When a second switching power supply 621 is provided, the input terminal of the second switching power supply 621 is connected to the second power supply branch 400 and the output terminal is connected to the power supply control power supply 602, so as to convert the electrical signal on the second power supply branch 400 into the required voltage status signal and transmit it to the power supply control power supply 602.

[0045] Furthermore, the power supply control power supply 602 is connected to the control subsystem 500 to supply power to the control subsystem 500.

[0046] Therefore, by setting up the third power supply branch 600, the control subsystem 500 can be powered by the energy storage power station itself using a redundant backup voltage source. This ensures that the control subsystem 500 can always operate continuously using the energy storage power station's own power, avoiding interference with the auxiliary load power supply due to the power failure of the control subsystem 500. This further guarantees the continuous and stable operation of the auxiliary load, thereby supporting the energy storage power station to supply power for grid black start. This provides a fundamental guarantee for the black start of both the energy storage power station and the grid, achieving a reliable and safe grid black start.

[0047] It should be noted that the power supply control power supply 602 is mainly used to convert the electrical energy output by the switching power supply 601 (including the first switching power supply 611 and / or the second switching power supply 621) into a suitable voltage to supply to the control subsystem 500. In some cases, if the electrical energy obtained by the switching power supply 601 is converted into the electrical energy signal required by the control subsystem 500 and supplied to the control subsystem 500, the switching power supply 601 may be directly connected to the control subsystem 500, rather than having to go through the power supply control power supply 602.

[0048] It should also be noted that, Figure 6 To reduce the complexity of the wiring, the connection relationships between the control subsystem 500 and structures other than the power supply control power supply 602 are not shown. The connection relationships between the control subsystem 500 and other structures are described in [the document / document]. Figure 4 , Figure 5 The corresponding embodiments have already been described, and will not be repeated here.

[0049] Furthermore, this application does not limit the first switching power supply 611 and the second switching power supply 621; they can be any switching power supply capable of converting the acquired electrical energy into the desired state. Also, this application does not limit the connection positions of the first switching power supply 611 and the first power supply branch 300, or the connection positions of the second switching power supply 621 and the second power supply branch 400. For example, in some embodiments, such as... Figure 6 As shown, the connection position of the first switching power supply 611 on the first power supply branch 300 can be located after the auxiliary transformer 301 and before the first switch 302, so that the switching of the first switch 302 will not affect the first switching power supply 611's acquisition of power from the first power supply branch 300 and its transmission to the power supply control power supply 602, thus ensuring the stability of the power acquisition by the first switching power supply 611; in some embodiments, the connection position of the first switching power supply 611 on the first power supply branch 300 can be located before the auxiliary transformer 301, etc.; furthermore, in some embodiments, such as... Figure 6 As shown, the connection position of the second switching power supply 621 on the second power supply branch 400 can be located before the inverter module 401; in some embodiments, the connection position of the second switching power supply 621 on the second power supply branch 400 can be located after the inverter module 401 and before the second switch 402, so that the switching of the second switch 402 will not affect the second switching power supply 621 obtaining power from the second power supply branch 400 and transmitting it to the power supply control power supply 602, thus ensuring the stability of the power obtained by the second switching power supply 621, etc., which will not be listed one by one here.

[0050] In some embodiments, if the switching power supply 601 includes a first switching power supply 611 and a second switching power supply 621, the power supply control power supply 602 can be configured to supply power to the control subsystem 500 using the power supplied by the first switching power supply 611 when it receives power from the first switching power supply 611; and to supply power to the control subsystem 500 using the power supplied by the second switching power supply 621 when it does not receive power from the first switching power supply 611. That is, prioritizing the use of power obtained from the first power supply branch 300 by the first switching power supply 611 to supply power to the control subsystem 500 is more conducive to ensuring the power supply stability of the control subsystem 500 and reducing the consumption of energy in the energy storage battery 101, so that the energy storage battery 101 has sufficient energy to support the power system's black start in a "black" state. Of course, this is only an example; in some embodiments, the power supply control power supply 602 can also use other strategies to supply power to the control subsystem 500, which will not be listed here.

[0051] In some embodiments, such as Figure 7 As shown, the second power supply branch 400 also includes at least two fifth switches 403. The inverter module 401 is connected to the energy storage battery 101 through the fifth switches 403. Different fifth switches 403 are connected to different energy storage batteries 101, and the different fifth switches 403 are interlocked. Thus, by setting at least two fifth switches 403, the second power supply branch 400 can obtain power from different energy storage batteries 101 and provide it to the auxiliary load and its power supply control subsystem 200. This avoids black start failure caused by the failure of a single energy storage battery 101, further ensuring the continuous normal operation of the auxiliary load. This supports the energy storage power station in providing power for grid black start, providing fundamental protection for the black start of the energy storage power station and the grid, and realizing reliable and safe grid black start.

[0052] In some embodiments, such as Figure 8 As shown, the energy storage power station also includes a sixth switch 700. The first power supply branch 300 and the second power supply branch 400 are both connected to the auxiliary load and its power supply control subsystem 200 through the sixth switch 700. This allows for overall control of the on / off state of the first power supply branch 300 and the second power supply branch 400 through the sixth switch 700, improving control efficiency.

[0053] It should be noted that when the fourth switch 304 and the sixth switch 700 are installed at the same time, the fourth switch 304 is also directly connected to the auxiliary load and its power supply control subsystem. Accordingly, when it is necessary to maintain the energy storage power station, the first switch 302, the second switch 402, the fifth switch 403 and the sixth switch 700 can be flexibly disconnected to facilitate the inspection and maintenance of different structures.

[0054] It should be noted that, in order to highlight the innovative aspects of this application, no units that are not closely related to solving the technical problems proposed in this application have been introduced in the above embodiments. However, this does not mean that there are no other units in the embodiments of this application. For example, in some cases, the energy storage power station also includes control equipment for maintaining each energy storage battery 101, etc., which will not be listed here.

[0055] The above breakdown of the structural steps is only for clarity. In practice, they can be merged into a single module (or circuit, etc.) or some modules (or circuits, etc.) can be split into multiple structures. As long as they include the same logical relationships, they are all within the scope of protection of this application. Adding insignificant modifications or introducing insignificant designs to the structure, without changing its core design, are also within the scope of protection of this application.

[0056] It is worth mentioning that the subsystems, modules, circuits, etc. involved in this embodiment can be a single physical unit, a part of a single physical unit, or a combination of multiple physical units in practical applications.

[0057] Correspondingly, this application also provides a control method for an energy storage power station, used for black-starting the energy storage power station, which includes the energy storage power station described in the above embodiments. It should be noted that this application does not limit the executing entity of the control method for the energy storage power station. The executing entity can be an internal module, device, or component with control functions within the energy storage power station, or an external controller or control system of the energy storage power station, etc., which will not be listed here.

[0058] In some embodiments, such as Figure 9 As shown, the control methods for energy storage power stations include: Step S11: Obtain the real-time electrical signal on the first power supply branch.

[0059] Step S12: Detect whether the power grid is out of service based on the real-time electrical signal on the first power supply branch. If yes, proceed to step S14; otherwise, proceed to step S13.

[0060] Step S13: Generate a second control signal and send the second control signal to the first switch and the second switch, wherein the second control signal is used to indicate that the first switch is turned on and to indicate that the second switch is turned off.

[0061] Step S14: Generate a first control signal and send the first control signal to the first switch and the second switch, wherein the first control signal is used to indicate that the first switch is open and to indicate that the second switch is on.

[0062] In some embodiments, acquiring the real-time electrical signal on the first power supply branch can be achieved by the following steps: acquiring the real-time electrical signal on the first power supply branch and the real-time electrical signal output by the inverter module. Correspondingly, detecting whether the power grid is out of service based on the real-time electrical signal on the first power supply branch can be achieved by the following steps: detecting whether the power grid is out of service based on the real-time electrical signals on the first power supply branch and the second power supply branch.

[0063] In other words, by combining the real-time electrical signals from the first and second power supply branches, control decisions are made regarding the on / off states of the first and second switches. This ensures that when the power grid is operational, the first power supply branch remains open, allowing the energy from the energy storage batteries transmitted via the high-voltage switchgear and main transformer to be converted to the required state by the auxiliary transformer in the first power supply branch and transmitted to the auxiliary loads and their power supply control subsystem, thus powering the auxiliary loads of the energy storage power station. Conversely, when the power grid is out of service, the second power supply branch remains open, allowing the energy from the energy storage batteries to be converted to the required state by the inverter module in the second power supply branch and transmitted to the auxiliary loads and their power supply control subsystem, thus powering the auxiliary loads of the energy storage power station. Regardless of whether the energy storage power station is shut down, there is always a path through the first and second power supply branches to transmit the electrical energy from the energy storage battery to the auxiliary load and its power supply control subsystem, thus providing power to the auxiliary load of the energy storage power station. This ensures a continuous and stable power supply to the auxiliary load of the energy storage power station. Ultimately, by maintaining uninterrupted power supply to the auxiliary load of the energy storage power station in the "black" state, it maintains normal operation and supports the energy storage power station in providing power for the black start of the power grid. This provides a fundamental guarantee for the black start of both the energy storage power station and the power grid, achieving a reliable and safe black start for the power grid.

[0064] It should be noted that this application does not limit the specific conditions for a black start. In some embodiments, determining whether a power grid anomaly or power outage occurs based on the real-time electrical signal on the first power supply branch can be used as a condition requiring a black start. The real-time voltage behavior on the first power supply branch during a power grid anomaly can be set according to the application scenario, maintenance capabilities, etc. Thus, whether an anomaly has occurred is determined by judging whether the electrical signal behavior during an anomaly is met.

[0065] In some embodiments, the first power supply branch further includes a fourth switch, one end of which is connected to the auxiliary transformer and the other end to the auxiliary load and its power supply control subsystem; in this case, maintenance scenarios also need to be considered, such as... Figure 10 As shown, the control methods for energy storage power stations include: Step S21: Obtain the real-time electrical signal on the first power supply branch.

[0066] Step S22: Based on the real-time electrical signal on the first power supply branch, detect whether the power grid is out of service or whether the power supply branch needs maintenance, wherein the power supply branch includes the first power supply branch and / or the second power supply branch.

[0067] Step S23: If the power grid is out of service and no maintenance is required, a first control signal is generated and sent to the first switch, the second switch and the fourth switch. The first control signal is used to indicate that the first switch is open, the second switch is on and the fourth switch is open.

[0068] Step S24: If maintenance is required, a third control signal is generated and sent to the first switch, the second switch and the fourth switch. The third control signal is used to indicate that the first switch is open, the second switch is open and the fourth switch is closed.

[0069] Step S25: If the power grid is not shut down and does not require maintenance, a second control signal is generated and sent to the first switch, the second switch and the fourth switch. The second control signal is used to indicate that the first switch is turned on, the second switch is turned off and the fourth switch is turned off.

[0070] Therefore, by detecting whether the power grid is out of service and whether the power supply branch needs maintenance, control signals are generated accordingly based on the detection results. Specifically, when the power grid is out of service and a black start is required, the second power supply branch remains open, allowing the energy from the energy storage battery to be converted to the required state by the inverter module in the second power supply branch and transmitted to the auxiliary load and its power supply control subsystem, thereby powering the auxiliary load of the energy storage power station. When maintenance is required, the maintenance current branch containing the fourth switch remains open, allowing the energy from the energy storage battery transmitted through the high-voltage switchgear and the main transformer to be converted to the required state by the auxiliary transformer in the first power supply branch and then directly transmitted to the auxiliary load and its power supply control subsystem, thereby powering the auxiliary load of the energy storage power station. And, when neither a black start nor maintenance is required, the first power supply branch remains open, allowing the energy from the energy storage battery transmitted through the energy storage converter to be converted to the required state by the auxiliary transformer in the first power supply branch and transmitted to the auxiliary load and its power supply control subsystem, thereby powering the auxiliary load of the energy storage power station. Under any condition, the energy storage power station always has a pathway to transfer the electrical energy from the energy storage battery to the auxiliary load and its power supply control subsystem, and to supply power to the auxiliary load of the energy storage power station. This enables the energy storage power station to provide a continuous and stable power supply to the auxiliary load of the energy storage power station. Ultimately, by maintaining the uninterrupted power supply to the auxiliary load of the energy storage power station in the "black" state, the station can maintain normal operation and thus support the energy storage power station to supply power for the black start of the power grid. This provides a fundamental guarantee for the black start of both the energy storage power station and the power grid, and achieves a reliable and safe black start for the power grid.

[0071] To facilitate understanding, the control logic of the energy storage power station will be explained below in conjunction with the process from power grid loss to the completion of black start.

[0072] like Figure 11 As shown, the control methods for energy storage power stations include: Step S31: Keep the first switch on and the second switch off to provide power to the auxiliary load and its power supply control subsystem through the first power supply branch.

[0073] Step S32: Obtain the real-time electrical signal on the first power supply branch.

[0074] Step S33: Detect whether the power grid is out of service based on the real-time electrical signal on the first power supply branch. If yes, proceed to step S34; otherwise, proceed to step S32.

[0075] In some embodiments, real-time electrical signals on the first power supply branch and the second power supply branch can also be acquired to detect whether the power grid is out of service.

[0076] Step S34: Switch the first switch to be off and the second switch to be on, so as to provide power to the auxiliary load and its power supply control subsystem through the second power supply branch.

[0077] Step S35: Start the energy storage converter to convert the DC voltage of the energy storage battery into AC voltage, and then boost the voltage through the main transformer to send power to the grid side to rebuild the grid voltage.

[0078] Once the grid voltage stabilizes, the inverter module's output voltage, frequency, and phase will be gradually adjusted to synchronize with the auxiliary transformer.

[0079] Step S36: Obtain the real-time electrical signal on the first power supply branch.

[0080] Step S37: Based on the real-time electrical signal on the first power supply branch, determine that the power grid has been restored and a black start is not required.

[0081] Step S38: Switch the first switch to be on and the second switch to be off, so as to provide power to the auxiliary load and its power supply control subsystem through the first power supply branch.

[0082] In other words, after the synchronization and black start are completed, the power supply to the auxiliary load is switched from the second power supply circuit to the first power supply circuit.

[0083] It should be noted that, Figures 9-11 For example only, in some embodiments, real-time electrical signals from the first power supply branch and the second power supply branch can be collected simultaneously to determine whether a black start is required.

[0084] It should also be noted that the above embodiments mainly consider the control of the first, second, and fourth switches. It is understood that in some embodiments, the energy storage power station also includes a third, fifth, sixth, and seventh switch. In this case, when controlling the energy storage power station, it is also necessary to consider controlling the third, fifth, sixth, and seventh switches. The following will provide exemplary descriptions of different system structures provided in the foregoing embodiments.

[0085] In some embodiments, the first power supply branch further includes a fourth switch, one end of which is connected to an auxiliary transformer and the other end of which is connected to an auxiliary load and its power supply control subsystem.

[0086] Accordingly, detecting whether the power grid is out of service can be achieved by detecting whether the power grid is out of service or whether the power supply branch needs maintenance, wherein the power supply branch includes a first power supply branch and / or a second power supply branch. If the power grid is detected as not out of service, generating a second control signal and sending it to the first and second switches can be achieved by generating a second control signal and sending it to the first, second, and fourth switches if the power grid is detected as not out of service and does not require maintenance, wherein the second control signal also instructs the fourth switch to open. If the power grid is detected as out of service, generating a first control signal and sending it to the first and second switches can be achieved by generating a first control signal and sending it to the first, second, and fourth switches if the power grid is detected as out of service and does not require maintenance, wherein the first control signal also instructs the fourth switch to open.

[0087] Based on this, the control method further includes: generating a third control signal and sending the third control signal to the first switch, the second switch and the fourth switch when maintenance is detected, wherein the third control signal is used to indicate that the first switch is open, the second switch is closed and the fourth switch is closed.

[0088] In some embodiments, the first power supply branch further includes a third switch, and both the first switch and the sampling board are connected to the auxiliary transformer through the third switch.

[0089] Accordingly, sending the second control signal to the first, second, and fourth switches can be achieved by sending the second control signal to the first, second, third, and fourth switches, wherein the second control signal is also used to indicate that the third switch is turned on. Sending the third control signal to the first, second, and fourth switches can be achieved by sending the third control signal to the first, second, third, and fourth switches, wherein the third control signal is also used to indicate that the third switch is turned off.

[0090] In some embodiments, the system further includes a sixth switch, through which both the first power supply branch and the second power supply branch are connected to the auxiliary load and its power supply control subsystem.

[0091] Accordingly, sending the first control signal to the first, second, and fourth switches can be achieved by sending the first control signal to the first, second, fourth, and sixth switches, wherein the first control signal is also used to indicate that the sixth switch is on. Sending the second control signal to the first, second, and fourth switches can be achieved by sending the second control signal to the first, second, fourth, and sixth switches, wherein the second control signal is also used to indicate that the sixth switch is on. Sending the third control signal to the first, second, and fourth switches can be achieved by sending the third control signal to the first, second, fourth, and sixth switches, wherein the third control signal is also used to indicate that the sixth switch is off.

[0092] In some embodiments, the second power supply branch further includes at least two fifth switches, through which the inverter module is connected to the energy storage battery. Different fifth switches are connected to different energy storage batteries, and the different fifth switches are interlocked.

[0093] Accordingly, sending the first control signal to the first, second, and fourth switches can be achieved by sending the first control signal to the first, second, fourth, and fifth switches, wherein the first control signal is also used to indicate that one of the fifth switches is turned on and the remaining fifth switches are turned off. Sending the third control signal to the first, second, and fourth switches can be achieved by sending the third control signal to the first, second, fourth, and fifth switches, wherein the third control signal is also used to indicate that the fifth switches are turned off.

[0094] To facilitate understanding of the control method provided in the above embodiments for controlling each switch when more switches are involved, the following will combine... Figures 12-14 The provided energy storage power station is explained.

[0095] like Figure 12As shown, the energy storage power station includes an energy storage subsystem 100, an auxiliary load and its power supply control subsystem 200, a first power supply branch 300, a third power supply branch 600, and a sixth switch 700. The energy storage subsystem 100 includes n1 energy storage batteries 101, one energy storage converter 102, one main transformer 103, and one high-voltage switchgear 104. The energy storage converter 102, main transformer 103, and high-voltage switchgear 104 are connected sequentially. One of the n1 energy storage batteries 101 is connected to the energy storage converter 102. The auxiliary load and its power supply control subsystem 200 includes n2 auxiliary loads and their power supply control submodules 201. The first power supply branch 300 includes one auxiliary transformer 301, one first switch 302, one third switch 303, and one fourth switch 304. The third switch 303 and the first switch 302 are connected in sequence. One end of the fourth switch 304 is connected to the output terminal of the auxiliary transformer 301 and the other end is connected to the sixth switch 700. The second power supply branch 400 includes n1 fifth switches 403, one inverter module 401 and one second switch 402. The inverter module 401 is connected to the second switch 402. One end of each of the n1 fifth switches 403 is connected to a different energy storage battery 101 and the other end is connected to the inverter module 401. The sixth switch 700 is connected to n2 auxiliary loads and their power supply control submodules 201, where n1 and n2 are both positive integers.

[0096] like Figure 13 As shown, the energy storage power station also includes a control subsystem 500. The control subsystem 500 includes a sampling board 501 and a controller 502. One sampling channel of the sampling board 501 is connected to the stage before the first switch 302 and the stage after the third switch 303. The other sampling channel of the sampling board 501 is connected to the stage after the inverter module 401 and the stage before the second switch 402. The output terminal of the sampling board 501 is connected to the controller 502. The output terminal of the controller 502 is connected to the first switch 302 and the second switch 402, respectively.

[0097] like Figure 14 As shown, the energy storage power station also includes a third power supply branch 600. The third power supply branch 600 includes a first switching power supply 611, a second switching power supply 621, and a power supply control power supply 602. The power supply control power supply 602 is connected to the first switching power supply 611 and the second switching power supply 621, respectively. The second switching power supply 621 is connected to the front stage of the inverter module 401 and the rear stage of the third switch 303. The first switching power supply 611 is connected to the rear stage of the auxiliary transformer 301 and the front stage of the first switch 302.

[0098] Based on Figures 12-14After the energy storage power station shown is started and connected to the grid in normal condition (at this time, it is assumed that the power provided by the energy storage battery 101 is 1500V DC, the auxiliary load and its power supply control subsystem 200 require 400V AC as power, and the control subsystem 500 requires 24V DC as power), the sampling board 501 collects the real-time electrical signal flowing through the third switch 303 and sends it to the controller 502. The controller 502 determines that the grid has not stopped operating based on the acquired real-time electrical signal, and then sends corresponding control signals to the first switch 302 and the second switch 402. The first switch 302 remains on based on the received control signal, and the second switch 402 remains off based on the received control signal. At the same time, based on external control or the control of the controller 502, the third switch 303, the sixth switch 700, and one of the fifth switches 403 remain on, and the fourth switch 304 remains off. Therefore, the power grid converts the electrical energy transmitted through the high-voltage switchgear 104 and the main transformer 103 into the required state. On the one hand, it stores the energy in the energy storage battery 101 through the energy storage converter 102. On the other hand, it converts the energy into 400V AC power required by the auxiliary load and its power supply control subsystem 200 through the auxiliary transformer 301. This AC power is then sent to the auxiliary load and its power supply control subsystem 200 through the third switch 303, the first switch 302, and the sixth switch 700 to maintain the continuous operation of the auxiliary load. At the same time, the 400V AC power flowing through the first switch 302 will be converted into 24V DC power by the first switching power supply 611 and sent to the control subsystem 500 to maintain the continuous operation of the various structures in the control subsystem 500.

[0099] At a certain moment, the power grid suddenly experiences an anomaly or power outage. At this time, the sampling board 501 collects the real-time electrical signal flowing through the third switch 303 and sends it to the controller 502. Based on the acquired real-time electrical signal, the controller 502 determines that the power grid is out of service and a black start is required. Therefore, it sends corresponding control signals to the first switch 302 and the second switch 402. The first switch 302 switches from on to off based on the received control signal, and the second switch 402 switches from off to on based on the received control signal. Thus, the 1500V DC output from the energy storage battery 101 is fed into the inverter module via the fifth switch 403 (which remains on) and converted to 400V AC. This AC power is then fed into the auxiliary load and its power supply control subsystem 200 via the second switch 402 and the sixth switch 700, maintaining the continuous operation of the auxiliary load. Simultaneously, the 1500V DC power flowing through the fifth switch 403 is fed into the control subsystem 500 via the second switching power supply 621, maintaining the continuous operation of all structures within the control subsystem 500.

[0100] At another point in time, maintenance is required for the energy storage power station (e.g., maintenance is needed for the first or second power supply branch if it malfunctions). In this case, external control is used to keep the third switch 303, all fifth switches 403, the second switch 402, and the sixth switch 700 open, while keeping the fourth switch 304 closed. Therefore, the power grid converts the electrical energy transmitted through the high-voltage switchgear 104 and the main transformer 103 into the required state. On one hand, this energy is stored in the energy storage battery 101 via the energy storage converter 102; on the other hand, it is converted into 400V AC power required by the auxiliary load and its power supply control subsystem 200 via the auxiliary transformer 301, and then supplied to the auxiliary load and its power supply control subsystem 200 via the fourth switch 304 to maintain the continuous operation of the auxiliary load. Since maintenance is required, the controller 502 does not need to operate the first switch 302 and the second switch 402. Therefore, the control subsystem 500 can be de-energized without affecting the power supply to the auxiliary load and its power supply control subsystem 200.

[0101] It should be noted that the above description is only an example. For example, in some embodiments, the control of one or more of the third switch 303, all the fifth switches 403, the second switch 402 and the sixth switch 700 can also be achieved by the controller 502, or by manual control, etc., which will not be listed here.

[0102] It should also be noted that, Figure 13 and Figure 14 The hollow circle in the diagram represents an abbreviated description of the connection structure at the other end of the corresponding connecting line.

[0103] The steps of the various methods described above are only for clarity. In practice, they can be combined into one step or some steps can be split into multiple steps. As long as they include the same logical relationship, they are all within the scope of protection of this application. Adding insignificant modifications or introducing insignificant designs to the algorithm or process, but without changing the core design of the algorithm and process, are also within the scope of protection of this application.

[0104] It is not difficult to see that this embodiment is a method embodiment corresponding to the system embodiment, and this embodiment can be implemented in conjunction with the system embodiment. The relevant technical details mentioned in the system embodiment are still valid in this embodiment, and will not be repeated here to reduce repetition. Correspondingly, the relevant technical details mentioned in this embodiment can also be applied to the system embodiment.

[0105] Those skilled in the art will understand that the above embodiments are specific embodiments for implementing this application, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of this application.

Claims

1. An energy storage power station, characterized in that, include: The energy storage subsystem includes, in sequence, an energy storage battery, an energy storage converter, a main transformer, and a high-voltage switchgear; Auxiliary load and its power supply control subsystem; The first power supply branch includes an auxiliary transformer and a first switch connected in sequence. The auxiliary transformer is connected to the main transformer, and the first switch is connected to the auxiliary load and its power supply control subsystem. The second power supply branch includes an inverter module and a second switch connected in sequence. The inverter module is connected to the energy storage battery, and the second switch is connected to the auxiliary load and its power supply control subsystem. The inverter module is used to convert the received electrical energy into a preset state. In response to a first control signal generated when the power grid is out of service, the first switch is open and the second switch is closed; in response to a second control signal generated when the power grid is not out of service, the first switch is closed and the second switch is open.

2. The energy storage power station according to claim 1, characterized in that, The energy storage power station also includes a control subsystem, which includes a sampling board and a controller connected in sequence. The sampling board is also connected to the first power supply branch, or the sampling board is also connected to the first power supply branch and the second power supply branch respectively, so as to collect the electrical signal on the first power supply branch or collect the electrical signal on the first power supply branch and the second power supply branch; The controller is also connected to the first switch and the second switch respectively, so as to detect whether the power grid is out of service based on the electrical signal collected by the sampling board; In the event of a power grid outage, the first control signal is generated and sent to the first switch and the second switch; or, in the event of a power grid operation, the second control signal is generated and sent to the first switch and the second switch.

3. The energy storage power station according to claim 2, characterized in that, It also includes a third power supply branch, which includes a switching power supply and a power supply control power supply; The switching power supply includes a first switching power supply and / or a second switching power supply; The input terminal of the first switching power supply is connected to the first power supply branch and the output terminal is connected to the power supply control power supply, so as to transmit the electrical signal on the first power supply branch to the power supply control power supply. The input terminal of the second switching power supply is connected to the second power supply branch and the output terminal is connected to the power supply control power supply, so as to transmit the electrical signal on the second power supply branch to the power supply control power supply. The power supply control power source is connected to the control subsystem to supply power to the control subsystem.

4. The energy storage power station according to claim 3, characterized in that, The switching power supply includes the first switching power supply and the second switching power supply; The power supply control power source is configured to supply power to the control subsystem using the electrical energy supplied by the first switching power source when it receives electrical energy from the first switching power source. In addition, if no electrical energy is received from the first switching power supply, the control subsystem is powered by the electrical energy supplied from the second switching power supply.

5. The energy storage power station according to claim 2, characterized in that, The first power supply branch also includes a third switch, and both the first switch and the sampling board are connected to the auxiliary transformer through the third switch.

6. The energy storage power station according to any one of claims 1 to 5, characterized in that, The first power supply branch also includes a fourth switch, one end of which is connected to the auxiliary transformer and the other end is connected to the auxiliary load and its power supply control subsystem.

7. The energy storage power station according to any one of claims 1 to 5, characterized in that, The second power supply branch also includes at least two fifth switches. The inverter module is connected to the energy storage battery through the fifth switches. Different fifth switches are connected to different energy storage batteries, and the different fifth switches are interlocked.

8. The energy storage power station according to any one of claims 1 to 5, characterized in that, The inverter module includes an inverter and a transformer connected in sequence. The inverter is connected to the energy storage battery, and the transformer is connected to the auxiliary load and its power supply control subsystem via the second switch.

9. The energy storage power station according to any one of claims 1 to 5, characterized in that, The energy storage power station also includes a sixth switch, through which the first power supply branch and the second power supply branch are connected to the auxiliary load and its power supply control subsystem.

10. A control method for an energy storage power station, characterized in that, The method for controlling the energy storage power station as described in claim 1 includes: Obtain the real-time electrical signal on the first power supply branch; Based on the real-time electrical signal on the first power supply branch, detect whether the power grid is out of service; In the event of a detected power grid outage, the first control signal is generated and sent to the first switch and the second switch, wherein the first control signal is used to instruct the first switch to open and instruct the second switch to close; If the power grid is not shut down, the second control signal is generated and sent to the first switch and the second switch, wherein the second control signal is used to indicate that the first switch is turned on and to indicate that the second switch is turned off.

11. The control method for an energy storage power station according to claim 10, characterized in that, The step of acquiring the real-time electrical signal on the first power supply branch includes: Acquire real-time electrical signals from the first power supply branch and the second power supply branch; The step of detecting whether the power grid is out of service based on the real-time electrical signal on the first power supply branch includes: The power grid is detected as shut down based on the real-time electrical signals from the first and second power supply branches.

12. The control method for an energy storage power station according to claim 10 or 11, characterized in that, The first power supply branch also includes a fourth switch, one end of which is connected to the auxiliary transformer and the other end is connected to the auxiliary load and its power supply control subsystem; The detection of whether the power grid is out of service includes: Detecting whether the power grid is out of service or whether the power supply branch needs maintenance, wherein the power supply branch includes the first power supply branch and / or the second power supply branch; The step of generating the second control signal and sending the second control signal to the first switch and the second switch when the power grid is detected to be not shut down includes: If the power grid is detected to be operating normally and not requiring maintenance, a second control signal is generated and sent to the first switch, the second switch and the fourth switch, wherein the second control signal is also used to instruct the fourth switch to open; The step of generating the first control signal and sending it to the first switch and the second switch when a power grid outage is detected includes: If a power grid outage is detected and no maintenance is required, the first control signal is generated and sent to the first switch, the second switch and the fourth switch, wherein the first control signal is also used to instruct the fourth switch to open; The method further includes: If maintenance is required, a third control signal is generated and sent to the first switch, the second switch, and the fourth switch, wherein the third control signal is used to indicate that the first switch is open, the second switch is closed, and the fourth switch is open.

13. The control method for an energy storage power station according to claim 12, characterized in that, The first power supply branch also includes a third switch, and the first switch is connected to the auxiliary transformer through the third switch; Sending the second control signal to the first switch, the second switch, and the fourth switch includes: The second control signal is sent to the first switch, the second switch, the third switch and the fourth switch, wherein the second control signal is also used to indicate that the third switch is turned on; Sending the third control signal to the first switch, the second switch, and the fourth switch includes: The third control signal is sent to the first switch, the second switch, the third switch, and the fourth switch, wherein the third control signal is also used to instruct the third switch to be turned off.

14. The control method for an energy storage power station according to claim 12, characterized in that, The system also includes a sixth switch, through which the first power supply branch and the second power supply branch are both connected to the auxiliary load and its power supply control subsystem; Sending the first control signal to the first switch, the second switch, and the fourth switch includes: The first control signal is sent to the first switch, the second switch, the fourth switch and the sixth switch, wherein the first control signal is also used to indicate that the sixth switch is turned on; Sending the second control signal to the first switch, the second switch, and the fourth switch includes: The second control signal is sent to the first switch, the second switch, the fourth switch and the sixth switch, wherein the second control signal is also used to indicate that the sixth switch is turned on; Sending the third control signal to the first switch, the second switch, and the fourth switch includes: The third control signal is sent to the first switch, the second switch, the fourth switch, and the sixth switch, wherein the third control signal is also used to instruct the sixth switch to be turned off.

15. The control method for an energy storage power station according to claim 12, characterized in that, The second power supply branch also includes at least two fifth switches. The inverter module is connected to the energy storage battery through the fifth switches. Different fifth switches are connected to different energy storage batteries, and the different fifth switches are interlocked. Sending the first control signal to the first switch, the second switch, and the fourth switch includes: The first control signal is sent to the first switch, the second switch, the fourth switch and the fifth switch, wherein the first control signal is also used to indicate that one of the fifth switches is turned on and the rest of the fifth switches are turned off; Sending the third control signal to the first switch, the second switch, and the fourth switch includes: The third control signal is sent to the first switch, the second switch, the fourth switch, and the fifth switch, wherein the third control signal is also used to instruct the fifth switch to be turned off.

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