Power grid state recognition device and method of energy storage integrated cabinet parallel operation system and medium

Abstract

The invention relates to the technical field of energy storage, in particular to a power grid state recognition device and method of an energy storage integrated cabinet parallel operation system and a medium. The device comprises a passive switch, the passive switch is arranged in an ATS switch, the passive switch is used for determining the switch switching state of the passive switch according to the switching state of the ATS switch, a microprocessor is arranged in a host inverter, the microprocessor is connected with the passive switch, and the host inverter is connected with the passive switch. The microprocessor is used for judging whether the source state of the power supply is a power grid input state or a diesel generator input state according to the switching state of the passive switch, parallel communication is adopted between the microprocessor and each slave inverter, and the microprocessor is used for directly sending a judgment result to the slave inverters by adopting parallel communication; therefore, safety redundancy design and system complexity caused by strong current sampling are avoided, and the accuracy of judging the source state of the actual power supply by the slave is improved.

Description

Technical Field

[0001] The present invention relates to the field of energy storage technology, and in particular to a power grid status identification device, method and medium for an energy storage integrated cabinet parallel system. Background Art

[0002] The three-phase energy storage integrated cabinet is a comprehensive power electronic device that integrates the key components of the energy storage system. It is mainly used to store electrical energy and release it when needed to balance the supply and demand of the power system and improve the operating efficiency and power quality of the power grid. In order to meet the growing power demand and improve the reliability and flexibility of the system, the parallel system of multiple three-phase energy storage integrated cabinets came into being. In the parallel system of multiple energy storage integrated cabinets, the automatic transfer switch (ATS) is a key component that can automatically switch between the grid power supply and the diesel generator power supply in the off-grid state to ensure the continuity of power supply.

[0003] At present, in order to ensure the uniformity and coordination of system power switching and avoid conflicts and risks that may be caused by power switching of multiple devices at the same time, ATS switches are usually only set in the host in the parallel system of multiple energy storage cabinets, and no ATS switches are set in the slaves. Therefore, only the host can identify whether the power source is the power grid or the diesel generator, and then perform different energy distribution controls for different power sources, while the slave relies on the information and control instructions provided by the host, and the AC side of the slave is directly connected to the AC output of the host, which means that the slave receives only the power signal processed by the host, rather than the original power identification information, and cannot independently identify the power source, resulting in the slave being unable to accurately control the energy distribution on its AC side according to the actual power supply situation, thereby reducing the accuracy of energy distribution regulation of the entire energy storage cabinet parallel system, especially when the host fails, communication is interrupted, power is switched or the power grid fluctuates, the slave cannot respond to power changes in time, seriously affecting the stability and reliability of the system.

[0004] To this end, the solution currently commonly adopted in the prior art is: each energy storage integrated cabinet (including the host and the slave) samples electrical parameters at each of its electrical ports, analyzes the sampled data to identify the source state of the power supply, the grid input state, or the diesel generator (i.e., diesel generator) input state of each slave, and then transmits it to the control system of the host through the strong power circuit. The control system on the host formulates the energy distribution strategy and control instructions for each slave according to the current power source state, and then sends the corresponding energy distribution strategy and control instructions to the slave. The slave adjusts its energy distribution according to the instructions to adapt to the change of the power supply, thereby improving the accuracy of the energy distribution regulation of the entire energy storage integrated cabinet parallel system to a certain extent. However, the solution of the prior art requires that each energy storage integrated cabinet be equipped with a port grid sampling circuit for strong power sampling, which requires the wire of the sampling circuit to be connected from the power line (usually a high-voltage or high-current line), and due to the particularity of strong power sampling, additional protection design must be added to the sampling circuit to ensure electrical safety. The entire energy storage integrated cabinet parallel system also requires more complex control logic to process and transmit a large amount of sampling data and instructions, which greatly increases the safety redundancy design and system complexity. Summary of the invention

[0005] In response to the above technical problems, the present invention proposes a grid status identification device, method and medium for a parallel system of an integrated energy storage cabinet, aiming to avoid the redundant safety design and system complexity caused by high-voltage sampling, while improving the accuracy of the slave's judgment on the source status of the actual power supply.

[0006] In a first aspect, the present application provides a power state identification device for an energy storage integrated cabinet parallel system, wherein the energy storage integrated cabinet parallel system is composed of inverters of each energy storage integrated cabinet connected in parallel, an ATS switch is connected to a host inverter, and the device includes a passive switch, which is built into the ATS switch, and the passive switch is used to determine its own switch switching state according to the switching state of the ATS switch; A microprocessor is provided in the host inverter, and the microprocessor is connected to the passive switch. The microprocessor is used to judge whether the source state of the power supply is the grid input state or the diesel generator input state according to the switch switching state of the passive switch. The microprocessor and each slave inverter adopt parallel communication, and the microprocessor is used to send the judgment result directly to the slave inverter by parallel communication.

[0007] In some embodiments, the passive switch includes a linkage control structure, and the linkage control structure is used to receive a contact signal of the ATS switch and drive the contact action of the passive switch according to the contact signal of the ATS switch.

[0008] In some embodiments, the passive switch includes a contact, a first contact and a second contact. When the contact of the ATS switch is attracted to the contact of the grid input terminal, the linkage control structure drives the contact of the passive switch to be attracted to the first contact. When the contact of the ATS switch is attracted to the contact of the diesel generator input terminal, the linkage control structure drives the contact of the passive switch to be attracted to the second contact.

[0009] In some embodiments, an optocoupler is provided in the host inverter, and the microprocessor is connected to the passive switch through the optocoupler. The optocoupler is used to isolate high-level and low-level signals and realize conversion between different levels according to the switching state of the passive switch. The microprocessor is used to detect the high and low levels of the input level signal to determine whether the source state of the power supply is the grid input state or the diesel generator input state.

[0010] In some embodiments, the optocoupler includes an input side and an output side, the input side and the output side of the optocoupler are respectively connected to voltage input line one and voltage input line two, the other end of the input side is connected to the second contact of the passive switch, the contact of the passive switch is grounded, the connection between the output side of the optocoupler and the voltage input line two is connected to the microprocessor, and the other end of the output side is grounded.

[0011] In some embodiments, the device includes an indication module connected to the microprocessor, and the indication module is used to provide a visual power status indication when the judgment result of the microprocessor is a diesel generator input state.

[0012] In a second aspect, the present application provides a method for identifying a grid status of an energy storage integrated cabinet parallel system, comprising the following steps: Determine the switching state of the passive switch in real time according to the switching state of the ATS switch; According to the switching state of the passive switch, it is determined whether the source state of the power supply is the grid input state or the diesel generator input state; The judgment result is directly sent to the slave inverter using parallel communication.

[0013] In some embodiments, judging whether the source state of the power supply is a grid input state or a diesel generator input state according to the switch switching state of the passive switch includes: According to the switching state of the passive switch, the level of the input signal of the microprocessor is detected; The source state of the power supply is determined based on the detection result of the input level signal. If the input level signal is at a high level, the source state of the power supply is the grid input state. If the input level signal is at a low level, the source state of the power supply is the diesel generator input state.

[0014] In some embodiments, the following steps are also included: When the communication is disturbed, the master inverter controls to disconnect the electrical connection and parallel communication with each slave inverter and enter the stand-alone mode.

[0015] In a third aspect, a computer-readable storage medium stores a computer program, which, when executed by a processor, implements the aforementioned method for identifying the power grid status of the energy storage integrated cabinet parallel system.

[0016] The beneficial technical effects of the present invention include at least: 1. A grid state identification device, method and medium of an energy storage integrated cabinet parallel system are adopted. A passive switch is built into the ATS switch, and the switching state of the passive switch is designed to be synchronized with the switching state of the ATS switch, thereby adding an auxiliary signal of the power source state switching output to indicate the source state of the current power source in real time. This auxiliary signal is not processed by the host, and the original power source identification information is retained. In combination with a microprocessor set in the host inverter, the microprocessor is connected to the passive switch, so that the microprocessor can judge whether the source state of the power source is the grid input state or the diesel generator input state according to the switch switching state of the passive switch. The microprocessor and each slave The inverters of the main machine adopt parallel communication, and the inverters of the slave machine directly adopt parallel communication to receive the judgment results sent by the microprocessor to realize the slave machine's autonomous identification of the current real power source status, which improves the accuracy of the slave machine's judgment on the source status of the actual power supply, and enables each slave machine to quickly respond to the change of the power supply status, because each slave machine directly receives the original power supply status indication from the passive switch, without the need to design a complex high-voltage sampling circuit in each slave machine, and does not rely on the sampling and analysis of each slave machine itself, which greatly reduces the redundant design of safety regulations, reduces the complexity of the system, reduces the potential failure points caused by high-voltage sampling, and improves the overall stability and reliability of the system; 2. An ingenious structural design is adopted to connect the microprocessor and the passive switch by setting an optocoupler in the host inverter, and the high-level and low-level signals are isolated by the optocoupler. The conversion of different levels of the microprocessor input terminal is realized through the real-time response of the optocoupler in different switch switching states of the passive switch, so that the microprocessor can directly judge whether the source state of the power supply is the grid input state or the diesel generator input state according to the high and low level of the detected input level signal, thereby avoiding redundant high-voltage sampling wiring and complex data analysis, processing and transmission, thereby greatly improving the response speed of the slave to the change of the power supply state. At the same time, under the structural design of the present application, the isolation characteristics of the optocoupler can ensure that the contact action signal of the passive switch can be safely transmitted between different potential levels without generating direct electrical connection, thereby reducing the misjudgment caused by electrical interference, ensuring that the slave can more accurately identify the source state of the power supply, and further improving the overall stability and reliability of the system.

[0017] Other features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the accompanying drawings: Figure 1 It is a structural schematic diagram of a power grid status identification device of an energy storage integrated cabinet parallel system according to an embodiment of the present invention.

[0019] Figure 2 It is a structural schematic diagram of a power grid status identification device of an energy storage integrated cabinet parallel system according to another embodiment of the present invention.

[0020] Figure 3 It is a structural schematic diagram of a power grid status identification device of an energy storage integrated cabinet parallel system according to another embodiment of the present invention. DETAILED DESCRIPTION

[0021] The technical solutions of the embodiments of the present invention are explained and described below in conjunction with the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the present invention.

[0022] In the following description, terms such as "inside", "outside", "up", "down", "left", "right", etc. that indicate directions or positional relationships are only used to facilitate the description of the embodiments and simplify the description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operate in a specific direction. Therefore, it should not be understood as a limitation of the present invention.

[0023] Before describing multiple embodiments of the present application, a brief introduction is first given to the existing structure of the energy storage cabinet parallel system: In the existing energy storage cabinet parallel system, each energy storage cabinet usually contains an inverter, and these inverters are connected in parallel through appropriate electrical connections and control systems to form a larger energy storage system. Specifically, the output ends of each inverter are connected together through an appropriate parallel connection method (such as a busbar or busbar), so that the outputs of multiple inverters can be combined to provide higher power output capacity.

[0024] The ATS switch is only installed in the host of a parallel system of multiple energy storage cabinets and is connected to the host inverter to automatically switch between the grid power supply and the diesel generator power supply in an off-grid state, ensuring the continuity of power supply.

[0025] Embodiment 1: See also Figure 1 , Figure 1A schematic diagram of the structure of a power grid status identification device for an energy storage integrated cabinet parallel system provided in one embodiment of this specification.

[0026] like Figure 1 As shown, the grid state identification device of the energy storage integrated cabinet parallel system may at least include: Passive switch: The passive switch is built into the ATS switch. The passive switch is used to determine its own switch switching state according to the switching state of the ATS switch; A microprocessor is provided in the host inverter, and the microprocessor is connected to the passive switch. The microprocessor is used to judge whether the source state of the power supply is the grid input state or the diesel generator input state according to the switching state of the passive switch. The microprocessor and each slave inverter adopt parallel communication, and the microprocessor is used to send the judgment result directly to the slave inverter by parallel communication.

[0027] Among them, each inverter in this embodiment is provided with a communication interface for parallel communication between the host inverter and the external system (such as the monitoring system, the energy management system) and between each slave inverter. The parallel communication can be realized through CAN bus, RS485, Ethernet, etc.

[0028] Furthermore, in this embodiment, the passive switch includes a linkage control structure, which is used to receive a contact signal of the ATS switch and drive the contact action of the passive switch according to the contact signal of the ATS switch.

[0029] Optionally, the linkage control structure of the passive switch in this embodiment may adopt the following design structure, as long as the switch switching state of the passive switch can be determined according to the switching state of the ATS switch, and this embodiment does not limit this: 1. Mechanical linkage design: A mechanical linkage mechanism is designed inside the ATS switch so that when the ATS switch switches between the main power supply (grid power supply) and the backup power supply (diesel power supply), it can directly drive the contact action of the passive switch through mechanical connection.

[0030] For example, a connecting rod, gear, cam or other transmission device can be used to transmit the contact action of the ATS switch to the passive switch, so that the contacts of the passive switch are switched synchronously with the action of the ATS switch.

[0031] 2. Electromagnetic drive design: An electromagnet is set inside the ATS switch. When the ATS switch is switched to the main power supply or the backup power supply, the electromagnet is energized to generate magnetic force, which drives the contact of the passive switch to move through electromagnetic action. This design requires a control circuit to monitor the state of the ATS switch and control the on and off of the electromagnet.

[0032] 3. Utilization of auxiliary contacts: Utilize the auxiliary contacts (also called auxiliary contacts or signal contacts) built into the ATS switch, which change state when the main contacts switch. Connect the auxiliary contacts to the control circuit of the passive switch, and when the state of the auxiliary contacts changes, the contact action of the passive switch is controlled by the circuit.

[0033] Furthermore, in this embodiment, the device may also include a mechanical interlocking structure, which ensures that only one power supply is connected to the load at any time to prevent the power supply from being reversely connected or connected in parallel.

[0034] Specifically, the technical concept of this embodiment is: by building a passive switch into the ATS switch, the switching state of the passive switch is designed to be synchronized with the switching state of the ATS switch, thereby adding an auxiliary signal of the power source state switching output to indicate the source state of the current power in real time, and this auxiliary signal is not processed by the host, and the original power identification information is retained. In combination with the microprocessor set in the host inverter, the microprocessor is connected to the passive switch, so that the microprocessor can judge whether the source state of the power is the grid input state or the diesel generator input state according to the switch switching state of the passive switch, and the microprocessor and each slave inverter adopt parallel communication (i.e. Figure 1 CAN&RS485 in the inverter), the slave inverter directly adopts parallel communication to receive the judgment result sent by the microprocessor to realize the slave to autonomously identify the current real power source status, which improves the accuracy of the slave's judgment on the source status of the actual power supply, and enables each slave to quickly respond to the change of the power status, because each slave directly receives the original power status indication from the passive switch, without the need to design a complex high-voltage sampling circuit in each slave, and does not rely on the sampling and analysis of each slave itself, which greatly reduces the redundant design of safety regulations, reduces the complexity of the system, reduces the potential failure points caused by high-voltage sampling, and improves the overall stability and reliability of the system.

[0035] On the other hand, an embodiment of the present specification provides a method for identifying a grid status of an energy storage integrated cabinet parallel system, which may at least include the following steps: Determine the switching state of the passive switch in real time according to the switching state of the ATS switch; According to the switching state of the passive switch, it is determined whether the source state of the power supply is the grid input state or the diesel generator input state; The judgment result is directly sent to the slave inverter using parallel communication.

[0036] It can be understood that the technical concept of the grid state identification method of the energy storage integrated cabinet parallel system provided in this embodiment is similar to the technical concept of the grid state identification device of the energy storage integrated cabinet parallel system provided in the aforementioned embodiment 1, and this embodiment will not be repeated here.

[0037] Embodiment 2: See also Figure 2 , Figure 2 A schematic diagram of the structure of a power grid status identification device for an energy storage integrated cabinet parallel system provided in yet another embodiment of the present specification.

[0038] This example only compares Figure 1 The corresponding added parts of the first embodiment are described, and the technical concept of the remaining structural design is similar to that of the first embodiment, which will not be repeated in this embodiment. Figure 2 As shown, in the grid status identification device of the energy storage integrated cabinet parallel system: the passive switch includes a contact, a first contact and a second contact. When the contact of the ATS switch is attracted to the contact of the grid input end, the linkage control structure drives the contact of the passive switch to be attracted to the first contact. When the contact of the ATS switch is attracted to the contact of the diesel generator input end, the linkage control structure drives the contact of the passive switch to be attracted to the second contact.

[0039] Specifically, the contact action of the passive switch in this embodiment can be realized in the following manner: If there is voltage at the grid input end, the contact of the ATS switch is attracted to the grid input contact 1, and the linkage control structure drives the contact of the passive switch to be attracted to the first contact 1; If there is no voltage at the grid input terminal and there is voltage at the diesel generator input terminal, the contact of the ATS switch is closed with the contact 2 at the diesel generator input terminal, and the linkage control structure drives the contact of the passive switch to close with the second contact 2; If there is no voltage at the grid input end and there is no voltage at the diesel generator input end, the contact of the ATS switch is energized with contact 1 at the grid input end, and the linkage control structure drives the contact of the passive switch to be energized with the first contact 1.

[0040] Furthermore, in this embodiment, an optocoupler is provided in the host inverter, and the microprocessor and the passive switch are connected through the optocoupler. The optocoupler is used to isolate high-level and low-level signals and realize conversion between different levels according to the switching state of the passive switch. The microprocessor is used to detect the high and low levels of the input level signal to determine whether the source state of the power supply is the grid input state or the diesel generator input state.

[0041] Among them, the optocoupler is a photoelectric converter, which usually contains a light-emitting diode (LED) and a photosensitive element (such as a phototransistor, photoresistor or photodiode). The main function of the optocoupler is to electrically isolate two circuits while allowing signals to pass from one circuit to another.

[0042] Specifically, in this embodiment, the optical coupler includes an input side (as a control signal side, i.e. Figure 2 The side where the light-emitting diode is located) and the output side (as the controlled signal side, i.e. Figure 2The input and output sides of the optocoupler are connected to the voltage input line 1 (i.e. Figure 2 12V voltage input line) and voltage input line 2 (i.e. Figure 2 The 5V voltage input line in the input side is connected to the second contact of the passive switch, the contact of the passive switch is grounded, the output side of the optocoupler is connected to the microprocessor at the connection point of the voltage input line 2, and the other end of the output side is grounded.

[0043] It can be understood that the technical concept of the present embodiment to determine whether the source state of the power supply is the grid input state or the diesel generator input state by detecting the level of the input level signal by the microprocessor is: When the source state of the power supply is the grid input state, the contact of the ATS switch is energized with the grid input terminal contact 1, and the linkage control structure drives the contact of the passive switch to be energized with the first contact 1. At this time, the input side of the optocoupler is cut off, that is, the light-emitting diode does not emit light, so that the photosensitive diode is cut off, that is, the output side of the optocoupler is disconnected. At this time, the 5V voltage input line is directly connected to the microprocessor, so the input level signal detected by the microprocessor is a high level of 5V; When the source state of the power supply is the diesel generator input state, the contact of the ATS switch is energized with the contact 2 of the diesel generator input end, and the linkage control structure drives the contact of the passive switch to be energized with the second contact 2. At this time, the input side of the optocoupler is turned on, that is, the light-emitting diode emits light, causing the photosensitive diode to be turned on, and the output side of the optocoupler is turned on accordingly. At this time, the 5V voltage input line is grounded through the output side of the optocoupler, so the input level signal detected by the microprocessor is a low level of 0V.

[0044] This embodiment has an ingenious structural design of connecting the microprocessor and the passive switch by setting an optocoupler in the host inverter, using the optocoupler to isolate high-level and low-level signals, and realizing the conversion of different levels of the microprocessor input terminal through the real-time response of the optocoupler in different switch switching states of the passive switch, so that the microprocessor can directly judge whether the source state of the power supply is the grid input state or the diesel generator input state according to the high and low level of the detected input level signal, avoiding redundant high-voltage sampling wiring and complex data analysis, processing and transmission, thereby greatly improving the response speed of the slave to the change of power supply state. At the same time, under the structural design of this embodiment, the isolation characteristics of the optocoupler can ensure that the contact action signal of the passive switch can be safely transmitted between different potential levels without generating direct electrical connection, thereby reducing misjudgment caused by electrical interference, ensuring that the slave can more accurately identify the source state of the power supply, and further improving the overall stability and reliability of the system.

[0045] On the other hand, another embodiment of the present specification provides a method for identifying the grid state of an energy storage integrated cabinet parallel system. Compared with the method for identifying the grid state of an energy storage integrated cabinet parallel system provided in the previous embodiment, in this embodiment, a method for judging whether the source state of a power supply is a grid input state or a diesel generator input state according to the switch switching state of a passive switch includes: According to the switching state of the passive switch, the level of the input signal of the microprocessor is detected; The source state of the power supply is determined based on the detection result of the input level signal. If the input level signal is at a high level, the source state of the power supply is the grid input state. If the input level signal is at a low level, the source state of the power supply is the diesel generator input state.

[0046] It can be understood that the technical concept of the grid state identification method of the energy storage integrated cabinet parallel system provided in this embodiment is similar to the technical concept of the grid state identification device of the energy storage integrated cabinet parallel system provided in the aforementioned embodiment 2, and this embodiment will not be repeated here.

[0047] Furthermore, in a parallel system of multiple energy storage cabinets, when the power supply of the host is switched from the grid to the diesel generator, if the slave fails to synchronize with the diesel generator when the power is switched, it may cause drastic fluctuations in voltage and frequency, damage the equipment and possibly cause a fire. Since the present embodiment transmits the judgment result of the microprocessor on the power source status through the parallel communication channel, when the system communication is disturbed, the parallel communication signal will inevitably be disturbed to a certain extent, thereby affecting the slave's reception of the power source status, and further adversely affecting the stability and reliability of the system. To this end, in the present embodiment, the grid status identification method of the energy storage cabinet parallel system also includes the following steps: When the communication is disturbed, the master inverter controls to disconnect the electrical connection and parallel communication with each slave inverter and enter the stand-alone mode.

[0048] By disconnecting the electrical connection between the host inverter and each slave inverter and the parallel communication when the communication is disturbed, the single-machine mode is entered to prevent the slave from misjudging the power source status and avoid the failure of the slave to keep consistent with the host power supply during power switching, resulting in equipment damage or even electrical fires and other dangerous situations.

[0049] Embodiment three: See also Figure 3 , Figure 3 A schematic diagram of the structure of a power grid status identification device for an energy storage integrated cabinet parallel system provided in yet another embodiment of the present specification.

[0050] This example only compares Figure 2The corresponding added parts of the second embodiment are described here, and the technical concept of the remaining structural design is similar to that of the second embodiment, which will not be repeated in this embodiment. Figure 3 As shown, the grid status identification device of the energy storage integrated cabinet parallel system also includes an indication module, which is connected to the microprocessor and is used to provide a visual power status indication when the judgment result of the microprocessor is a diesel generator input state.

[0051] Specifically, when the input level signal detected by the microprocessor is low level and the power source state is determined to be the diesel generator input state, the controller of the instruction module (such as Figure 3 485 chip in the control module) controls the diesel engine status indicator to light up.

[0052] Optionally, the indication module can also realize other visual indication functions under the control of the host, such as PV power supply status indication, grid status indication, system start and stop indication, communication connection strength indication, alarm indication, fire-fighting indication in case of electrical fire, etc., which is not limited in this embodiment.

[0053] Another embodiment of the present specification provides a computer-readable storage medium, which stores instructions, and when the instructions are executed on a computer or a processor, the computer or the processor executes one or more steps in the embodiment of the method for identifying the power grid state of the energy storage integrated cabinet parallel system. If the component modules of the above electronic device are implemented in the form of software functional units and used as independent downstream task predictions or uses, they can be stored in the computer-readable storage medium.

[0054] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented by software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of this specification is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted through the computer-readable storage medium. The computer instructions can be transmitted from a website site, computer, server or data center to another website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (Digital Subscriber Line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that includes one or more available media integrated. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a digital versatile disc (DVD)), or a semiconductor medium (eg, a solid state drive (SSD)).

[0055] The above description is only the preferred embodiment disclosed in this application and the description of the technical principle used. Those skilled in the art should understand that the scope of protection involved in this disclosure is not limited to the technical solution formed by a specific combination of the above technical features, but also should cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above disclosed concept. For example, the above features are replaced with the technical features with similar functions disclosed in this disclosure (but not limited to) to form a technical solution.

[0056] In addition, although each operation is described in a specific order, this should not be understood as requiring these operations to be performed in the specific order shown or in a sequential order. Under certain circumstances, multitasking and parallel processing may be advantageous. Similarly, although some specific implementation details are included in the above discussion, these should not be interpreted as limiting the scope of the present disclosure. Some features described in the context of a separate embodiment can also be implemented in a single embodiment in combination. On the contrary, the various features described in the context of a single embodiment can also be implemented in multiple embodiments individually or in any suitable sub-combination mode.

Claims

1. A power state identification device for an energy storage integrated cabinet parallel system, wherein the energy storage integrated cabinet parallel system is composed of inverters of each energy storage integrated cabinet connected in parallel, and an ATS switch is connected to a host inverter, and is characterized in that: It includes a passive switch, which is built into the ATS switch and is used to determine its own switch switching state according to the switching state of the ATS switch; A microprocessor is provided in the host inverter, and the microprocessor is connected to the passive switch. The microprocessor is used to judge whether the source state of the power supply is the grid input state or the diesel generator input state according to the switch switching state of the passive switch. The microprocessor and each slave inverter adopt parallel communication, and the microprocessor is used to send the judgment result directly to the slave inverter by parallel communication.

2. The power state identification device of the energy storage integrated cabinet parallel system according to claim 1, characterized in that: The passive switch includes a linkage control structure, and the linkage control structure is used to receive a contact signal of the ATS switch and drive the contact action of the passive switch according to the contact signal of the ATS switch.

3. The power state identification device of the energy storage integrated cabinet parallel system according to claim 2, characterized in that: The passive switch includes a contact, a first contact and a second contact. When the contact of the ATS switch is attracted to the contact of the power grid input end, the linkage control structure drives the contact of the passive switch to be attracted to the first contact. When the contact of the ATS switch is attracted to the contact of the diesel generator input end, the linkage control structure drives the contact of the passive switch to be attracted to the second contact.

4. The power state identification device of the energy storage integrated cabinet parallel system according to claim 3, characterized in that: The host inverter is provided with an optocoupler, and the microprocessor is connected to the passive switch through the optocoupler. The optocoupler is used to isolate high-level and low-level signals and realize conversion between different levels according to the switching state of the passive switch. The microprocessor is used to detect the high and low levels of the input level signal to determine whether the source state of the power supply is the grid input state or the diesel generator input state.

5. The power state identification device of the energy storage integrated cabinet parallel system according to claim 4, characterized in that: The optocoupler includes an input side and an output side. The input side and the output side of the optocoupler are respectively connected to voltage input line 1 and voltage input line 2. The other end of the input side is connected to the second contact of the passive switch. The contact of the passive switch is grounded. The connection between the output side of the optocoupler and the voltage input line 2 is connected to the microprocessor, and the other end of the output side is grounded.

6. The power state identification device of the energy storage integrated cabinet parallel system according to claim 1, characterized in that: The device comprises an indication module, which is connected to a microprocessor and is used for providing a visual indication of a power supply state when a judgment result of the microprocessor is a diesel generator input state.

7. A method for identifying the grid status of an energy storage integrated cabinet parallel system, characterized in that: The following steps are involved: Determine the switching state of the passive switch in real time according to the switching state of the ATS switch; According to the switching state of the passive switch, it is determined whether the source state of the power supply is the grid input state or the diesel generator input state; The judgment result is directly sent to the slave inverter using parallel communication.

8. The method for identifying the grid status of the energy storage integrated cabinet parallel system according to claim 7, characterized in that: According to the switching state of the passive switch, it is judged whether the source state of the power supply is the grid input state or the diesel generator input state, including: According to the switching state of the passive switch, the level of the input signal of the microprocessor is detected; The source state of the power supply is determined based on the detection result of the input level signal. If the input level signal is at a high level, the source state of the power supply is the grid input state. If the input level signal is at a low level, the source state of the power supply is the diesel generator input state.

9. The method for identifying the grid status of the energy storage integrated cabinet parallel system according to claim 7, characterized in that: The following steps are also included: When the communication is disturbed, the master inverter controls to disconnect the electrical connection and parallel communication with each slave inverter and enter the stand-alone mode.

10. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed by a processor, the method for identifying the grid status of the energy storage integrated cabinet parallel system as described in any one of claims 7 to 9 is implemented.

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