Energy storage stack hard point state detection method and device of high-voltage cascade direct-hanging energy storage system, electronic equipment and storage medium

Abstract

The application discloses a high-voltage cascade direct-hanging energy storage system energy storage stack hard point state detection method and device, electronic equipment and a storage medium. The method is applied to a detection system. The method comprises the following steps: detecting the level state of an optoelectrical interface through a programmable chip; the programmable chip controls the output state of the opening amount of a detection board according to a preset logic, and simultaneously encodes the level state of the optoelectrical interface and converts the encoded level state into an optical signal through an optical transmitter, and then transmits the optical signal to a PCS controller through an optical fiber to determine the hard point state of the energy storage stack. Through the application, the high potential of the energy storage stack hard point is isolated from the low potential of the PCS controller, and the hard point states of several energy storage stacks can be detected simultaneously.

Description

Technical Field

[0001] This application relates to the field of hard contact status detection technology for energy storage stacks, and in particular to a method, device, electronic equipment, and storage medium for detecting the hard contact status of energy storage stacks in a high-voltage cascaded direct-connected energy storage system. Background Technology

[0002] Energy storage technology is an essential supporting technology for the development of smart grids, renewable energy integration, distributed generation, and microgrids. It can improve the absorption of renewable energy sources such as wind and solar power, support the stable operation of distributed power and microgrids, and is a key technology for promoting the replacement of fossil fuels with renewable energy. It is also a core foundation for building the energy internet and promoting the development of new energy business models. Electrochemical energy storage is a technology that converts electrical energy into chemical energy through chemical reactions and then converts chemical energy back into electrical energy when needed. Common electrochemical energy storage carriers include lithium-ion batteries, sodium-sulfur batteries, and flow batteries, with lithium-ion batteries being the most widely used. Their working principle involves the migration of lithium ions between the positive and negative electrodes to store and release electrical energy.

[0003] As the energy storage carrier of an energy storage system, the operating status of the energy storage stack directly affects the system's performance and safety. When any energy storage stack experiences a Level 1 fault, the battery management system transmits the fault information to the energy management system and the PCS system via communication data. Upon receiving the Level 1 fault information, the PCS system stops operation and records the fault information for analysis of the system's shutdown cause. To enhance the reliability and speed of energy storage system protection, each energy storage stack has a hard-contact output interface, which is directly connected to the PCS system's input interface via a shielded cable. Summary of the Invention

[0004] This application provides a method, device, electronic equipment, and storage medium for detecting the hard contact status of the energy storage stack in a high-voltage cascaded direct-connected energy storage system, so as to realize the detection of the hard contact status of the energy storage stack.

[0005] The embodiments of this application adopt the following technical solutions:

[0006] In a first aspect, embodiments of this application provide a method for detecting the hard contact status of an energy storage stack in a high-voltage cascaded direct-connected energy storage system. This method is applied to a detection system comprising an energy storage stack, an electro-optical conversion circuit, an energy storage stack hard contact status detection board, and a PCS controller. The hard contact interface of the energy storage stack is connected to the electro-optical conversion circuit, which is connected to the photoelectric interface of the detection board via an optical fiber. The detection board includes a light receiver, a light transmitter, a programmable chip, and an input / output circuit. The input / output circuit is connected to the input / output detection circuit of the PCS controller via a shielded cable. The light transmitter is connected to the light receiver circuit of the PCS controller via an optical fiber. The method includes:

[0007] The voltage level of the optoelectronic interface is detected by the programmable chip.

[0008] The programmable chip controls the output status of the detection board according to the preset logic, and at the same time encodes the photoelectric interface level status and converts it into an optical signal through the optical transmitter, and then transmits it to the PCS controller through the optical fiber to determine the hard contact status of the energy storage stack.

[0009] In some embodiments, the method further includes:

[0010] The output signal from the detection board received by the PCS controller through the input signal detection circuit is used as the main protection signal. The output signal is the signal output by the programmable chip in claim 1 according to the preset logic.

[0011] The coded optical signal received by the PCS controller through the optical receiving circuit is used as a backup protection signal, and the coded optical signal is the signal after encoding the photoelectric interface level state in claim 1;

[0012] Based on the status of the main protection signal and the backup protection signal, the shutdown protection of the high-voltage cascaded direct-connected energy storage system is executed.

[0013] In some embodiments, the hard-contact interface of the energy storage stack is connected to an electro-optical conversion circuit, which converts the electrical signal of the hard-contact interface into an optical signal and transmits it to the optical receiving interface of the detection board through an optical fiber. After receiving the optical signal, the detection board converts the optical signal into an electrical signal through an internal optical receiver and transmits it to the onboard programmable chip.

[0014] When there is no Level 1 fault in the energy storage stack, the hard contacts remain in the preset normally closed or normally open state, and the light emitter of the electro-optical conversion circuit remains in the corresponding light-emitting or non-light-emitting state. When a Level 1 fault occurs in the energy storage stack, the hard contacts switch from the normally closed state to the open state or from the normally open state to the closed state, and the light emitter simultaneously switches from the light-emitting state to the non-light-emitting state or from the non-light-emitting state to the light-emitting state.

[0015] In some embodiments, when the optical receiver of the detection board detects light input or no light input, and the corresponding detection board output remains in a normally closed or normally open state, it is determined that all the energy storage stacks under test have no level 1 fault; when any optical receiver of the detection board detects no light input or light input, and the corresponding detection board output switches from a normally closed state to an open state or from a normally open state to a closed state, it is determined that at least one of the energy storage stacks under test has experienced a level 1 fault.

[0016] In some embodiments, the programmable chip defines a low level corresponding to the detection of light input by the photoelectric interface as 0 and a high level corresponding to the detection of no light input as 1. The level states are encoded into an n-bit binary data storage array in the order of photoelectric interface 1 to n. The parallel data in the array is then converted into serial data at a preset baud rate and transmitted to the PCS controller through the optical transmitter.

[0017] In some embodiments, after receiving the main protection signal, the PCS controller immediately stops operating and records the fault information; after receiving the coded optical signal of the backup protection, it parses the number information of the faulty energy storage stack to analyze the cause of the energy storage system shutdown.

[0018] In some embodiments, several energy storage stacks of a high-voltage cascaded direct-connected energy storage system are distributed across multiple prefabricated modules, each prefabricated module is equipped with one of the aforementioned detection boards, and the detection boards of each prefabricated module are communicatively connected to the same PCS controller.

[0019] Secondly, embodiments of this application also provide a hard-connection status detection device for a high-voltage cascaded direct-connected energy storage system, applied to a detection system. The detection system includes an energy storage stack, an electro-optical conversion circuit, a detection board, and a PCS controller. The hard-connection interface of the energy storage stack is connected to the electro-optical conversion circuit, and the electro-optical conversion circuit is connected to the photoelectric interface of the detection board via an optical fiber. The detection board includes a light receiver, a light transmitter, a programmable chip, and an output circuit. The output circuit is connected to the input detection circuit of the PCS controller via a shielded cable. The light transmitter is connected to the light receiver circuit of the PCS controller via an optical fiber. The device includes:

[0020] A level detection module is used to detect the level status of the optoelectronic interface through the programmable chip;

[0021] The output module is used to control the output status of the detection board according to the preset logic of the programmable chip, and at the same time encodes the photoelectric interface level status and converts it into an optical signal through the optical transmitter, and then transmits it to the PCS controller through the optical fiber to determine the status of the hard contact of the energy storage stack.

[0022] The protection signal module is used to take the output signal from the detection board received by the PCS controller through the input detection circuit as the main protection signal, and the coded optical signal received by the PCS controller through the optical receiving circuit as the backup protection signal, and to perform shutdown protection of the energy storage system according to the signal status.

[0023] The fault determination module is used to determine whether the energy storage stack has experienced a first-level fault based on the optical input status and output status of the optical receiver on the detection board.

[0024] The encoding rule module is used to encode the optoelectronic interface level status into a binary data storage array through a programmable chip, and to convert parallel data into serial data before transmitting it to the PCS controller.

[0025] Thirdly, embodiments of this application also provide an electronic device, including: a processor; and a memory arranged to store computer-executable instructions, which, when executed, cause the processor to perform the above-described method.

[0026] Fourthly, embodiments of this application also provide a computer-readable storage medium that stores one or more programs, which, when executed by an electronic device including multiple applications, cause the electronic device to perform the above-described method.

[0027] The above-mentioned technical solutions adopted in this application embodiment can achieve the following beneficial effects: A method for detecting the hard contact status of a high-voltage cascaded direct-connected energy storage system is applied to a detection system. The detection system includes an energy storage stack, an electro-optical conversion circuit, an energy storage stack hard contact status detection board, and a PCS controller. The hard contact interface of the energy storage stack is connected to the electro-optical conversion circuit, which is connected to the photoelectric interface of the detection board via an optical fiber. The detection board includes a light receiver, a light transmitter, a programmable chip, and an output circuit. The output circuit is connected to the input detection circuit of the PCS controller via a shielded cable, and the light transmitter is connected to the light receiver circuit of the PCS controller via an optical fiber. Specifically, the method includes detecting the voltage level of the photoelectric interface using the programmable chip; the programmable chip controls the output state of the detection board according to preset logic, and simultaneously encodes the voltage level of the photoelectric interface, converts it into an optical signal through the light transmitter, and then transmits it to the PCS controller via an optical fiber to determine the hard contact status of the energy storage stack. The hard contact output port of the energy storage stack is connected to the electro-optical conversion circuit. The electro-optical conversion circuit converts the electrical signal output by the hard contact into an optical signal and transmits it through optical fiber to the optical receiving circuit of the hard contact detection board. The optical receiving circuit of the hard contact detection board converts the optical signal into an electrical signal and transmits it to the programmable chip. The programmable chip detects the level input of the IO port and controls the state of the output quantity according to the control logic to realize the hard contact status detection of the energy storage stack. Attached Figure Description

[0028] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0029] Figure 1 This application provides a method for detecting the hard contact status of the energy storage stack in a high-voltage cascaded direct-connected energy storage system.

[0030] Figure 2 This is a schematic diagram of the structure of the hard contact status detection device for the energy storage stack of the high-voltage cascaded direct-connected energy storage system in the embodiments of this application;

[0031] Figure 3 This is a schematic diagram illustrating the implementation principle of the hard contact status detection method for the energy storage stack in the high-voltage cascaded direct-connected energy storage system in this application embodiment;

[0032] Figure 4 This is a schematic diagram of the structure of an electronic device according to an embodiment of this application. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] Electrochemical energy storage technologies mainly include: centralized energy storage, distributed energy storage, clustered energy storage, string energy storage, and high-voltage cascaded direct-connected energy storage. Each of these five mainstream technologies has its own advantages and disadvantages. Regardless of the chosen electrochemical energy storage technology, the energy storage stack, as the energy storage carrier of the energy storage system, has its operational status directly affecting the system's performance and safety.

[0035] Therefore, when any energy storage stack in the energy storage system experiences a Level 1 fault, the battery management system transmits the fault information of the faulty energy storage stack to the energy management system and the PCS system via communication data. After receiving the Level 1 fault information of the energy storage stack, the PCS system stops operating and records the fault information of the faulty energy storage stack for analysis of the cause of the energy storage system shutdown.

[0036] In addition, to increase the reliability and speed of energy storage system protection, each energy storage stack has a hard contact output interface. When a first-level fault occurs in the energy storage stack, the state of its hard contact interface changes from normally open to closed (or normally closed to open). The PCS system monitors the state change of the hard contact interface of the energy storage stack to implement the energy storage system shutdown protection logic.

[0037] Specifically, the hard contact interface of the energy storage stack is directly connected to the input interface of the PCS system via a shielded cable. When a level 1 fault occurs in the energy storage stack, the state of its hard contact interface changes. The PCS system detects this change in the input state and performs protection logic control to protect both the energy storage stack and the energy storage system. However, this approach has several disadvantages:

[0038] First, a shielded cable is used to directly connect the hard contact interface of the energy storage stack to the input detection circuit of the PCS system. The energy storage stack and the PCS system are at the same potential, but this connection method does not provide any potential isolation.

[0039] Secondly, when an energy storage system contains several energy storage stacks, and the system needs to simultaneously monitor the hard contact interface status of several energy storage stacks, the PCS controller needs to have a corresponding number of input detection circuits to detect changes in the hard contact interface status of the energy storage stacks in order to accurately detect faults in the energy storage stacks. Otherwise, it is impossible to accurately locate the faulty energy storage stack number.

[0040] To address the aforementioned issues, this application provides a method for detecting the hard contact status of a high-voltage cascaded direct-connected energy storage system's energy storage stack. The method, applied to a detection system, specifically includes: detecting the voltage level of the photoelectric interface using a programmable chip; the programmable chip controlling the output state of the detection board according to preset logic, and simultaneously encoding the photoelectric interface voltage level and converting it into an optical signal via an optical transmitter, which is then transmitted to the PCS controller via optical fiber to determine the hard contact status of the energy storage stack.

[0041] The technical solutions provided by the various embodiments of this application are described in detail below with reference to the accompanying drawings.

[0042] This application provides a method for detecting the hard contact status of the energy storage stack in a high-voltage cascaded direct-connected energy storage system, such as... Figure 1The diagram illustrates a flowchart of a method for detecting the hard-contact status of a high-voltage cascaded direct-connected energy storage system, applicable to a detection system. The detection system includes an energy storage stack, an electro-optical conversion circuit, an energy storage stack hard-contact status detection board, and a PCS controller. The hard-contact interface of the energy storage stack is connected to the electro-optical conversion circuit, which is connected to the photoelectric interface of the detection board via an optical fiber. The detection board includes a light receiver, a light transmitter, a programmable chip, and an output circuit. The output circuit is connected to the input detection circuit of the PCS controller via a shielded cable. The light transmitter is connected to the light receiver circuit of the PCS controller via an optical fiber. The method includes at least the following steps S110 to S120:

[0043] Step S110: The level state of the optoelectronic interface is detected by the programmable chip.

[0044] The programmable chip is used to detect the level status of the photoelectric interface. The programmable chip on the hard contact status detection board of the energy storage stack in the energy storage system detects the level status of photoelectric interface 1 to photoelectric interface n: low level is 0, high level is 1. It encodes one or more arrays in the order from 1 to n. The programmable chip converts parallel data into serial data and transmits it to the electro-optical conversion circuit. It transmits the status information of the energy storage stack to the PCS controller as a backup.

[0045] In step S120, the programmable chip controls the output state of the detection board according to the preset logic, and at the same time encodes the photoelectric interface level state and converts it into an optical signal through the optical transmitter, and then transmits it to the PCS controller through the optical fiber to determine the hard contact state of the energy storage stack.

[0046] The programmable chip on the hard contact detection board of the energy storage stack controls the output state of the output circuit according to the level state of its I / O ports and the control logic preset in the programmable chip programming program. Furthermore, the programmable chip on the hard contact detection board of the energy storage stack stores the state codes of the I / O ports in one or more data storage units according to the preset order of the I / O ports and the definition of the input level states of the I / O ports; finally, the programmable chip on the hard contact detection board of the energy storage stack converts the state code data of the I / O ports into serial data and transmits it to the PCS controller through an optical transmitter.

[0047] The above solution addresses the issue that all energy storage stacks in a high-voltage cascaded direct-connected energy storage system are at high potential, and there is a potential difference between the energy storage stacks. Furthermore, the hard-contact interfaces of the energy storage stacks cannot be directly connected to the PCS system's input detection circuit via shielded cables. A high-isolation technical solution is needed to isolate the high potential of the energy storage stack's hard-contacts from the low potential of the PCS controller, while simultaneously enabling the detection of the hard-contact status of several energy storage stacks.

[0048] In one embodiment of this application, the method further includes: using the output signal from the detection board received by the PCS controller through the input detection circuit as the main protection signal, wherein the output signal is a signal output by the programmable chip according to a preset logic; using the coded optical signal received by the PCS controller through the optical receiving circuit as the backup protection signal, wherein the coded optical signal is a signal encoded by the photoelectric interface level state; and performing shutdown protection of the high-voltage cascaded direct-connected energy storage system according to the state of the main protection signal and the backup protection signal.

[0049] like Figure 3 As shown, it includes a PCS controller, a hard contact detection board for the energy storage stacks, hard contact interfaces for n energy storage stacks, and an electro-optical conversion circuit. The hard contact detection board for the energy storage stacks includes: n photoelectric interfaces, one output signal, and one optical transmitter. The number of photoelectric interfaces matches the number of energy storage stacks.

[0050] First, the hard-contact circuit of the energy storage stack is connected to the electro-optical conversion circuit, which converts the electrical signal of the hard-contact circuit into an optical signal. The optical transmitter interface of the electro-optical conversion circuit is connected to one end of an optical fiber, and the other end of the optical fiber is connected to the optical receiver interface of the energy storage stack hard-contact detection board. The output of the energy storage stack hard-contact detection board is connected to the input detection circuit of the PCS control system using a shielded cable, and the optical transmitter is connected to the optical receiver of the PCS control system using an optical fiber. Second, the H-bridge energy storage system contains several energy storage stacks, which are distributed in several prefabricated compartments. For ease of wiring and use, a single energy storage stack hard-contact detection board is used for the hard contacts of the energy storage stacks in a single prefabricated compartment. The number of energy storage stacks that the energy storage stack hard-contact status detection board can simultaneously detect is no less than the number of energy storage stacks in a single prefabricated compartment. Finally, the high-voltage cascaded direct-connected energy storage system contains several energy storage stacks. When there is no Level 1 fault (the highest level fault) in the energy storage stacks of the energy storage system, their hard contacts remain in a normally closed state (or normally open state), and the light emitter of the photoelectric conversion circuit remains in an emitting state (or in a non-emitting state). When a Level 1 fault (the highest level fault) occurs in the energy storage stacks of the energy storage system, their hard contacts change from a normally closed state to an open state (or from a normally open state to a closed state), and the light emitter of the photoelectric conversion circuit changes from an emitting state to a non-emitting state (or from a non-emitting state to an emitting state).

[0051] In one embodiment of this application, the hard contact interface of the energy storage stack is connected to an electro-optical conversion circuit. The electro-optical conversion circuit converts the electrical signal of the hard contact interface into an optical signal, which is then transmitted to the optical receiving interface of the detection board via optical fiber. After receiving the optical signal, the detection board converts the optical signal back into an electrical signal through its internal optical receiver and transmits it to the onboard programmable chip. When there is no primary fault in the energy storage stack, the hard contact remains in a preset normally closed or normally open state, and the optical transmitter of the electro-optical conversion circuit remains in the corresponding emitting or non-emitting state. When a primary fault occurs in the energy storage stack, the hard contact switches from the normally closed state to the open state or from the normally open state to the closed state, and the optical transmitter simultaneously switches from the emitting state to the non-emitting state or from the non-emitting state to the emitting state.

[0052] The hard contact output port of the energy storage stack is connected to the electro-optical conversion circuit. The electro-optical conversion circuit converts the electrical signal output by the hard contact into an optical signal and transmits it through optical fiber to the optical receiving circuit of the hard contact detection board. The optical receiving circuit of the hard contact detection board converts the optical signal into an electrical signal and transmits it to the programmable chip. The programmable chip detects the level input of the IO port and controls the state of the output quantity according to the control logic to realize the hard contact status detection of the energy storage stack.

[0053] Optical fibers that transmit optical signals achieve high and low potential isolation between the hard contact interface circuit of the energy storage stack and the hard contact detection board of the energy storage stack. The optical fiber isolation technology can be applied to energy storage systems of 6kV~35kV. Compared with the magnetic isolation technology, the optical isolation solution is more reliable and less expensive.

[0054] In one embodiment of this application, when the optical receiver of the detection board detects light input or no light input, and the corresponding detection board output remains in a normally closed or normally open state, it is determined that all the energy storage stacks under test have no level 1 fault; when any optical receiver of the detection board detects no light input or light input, and the corresponding detection board output switches from a normally closed state to an open state or from a normally open state to a closed state, it is determined that at least one of the energy storage stacks under test has experienced a level 1 fault.

[0055] like Figure 3 As shown. When the energy storage stack of the energy storage system has no Level 1 fault, that is, the highest level fault, its hard contacts remain in a normally closed or normally open state; the light emitter of the photoelectric conversion circuit remains in an emitting state or a non-emitting state.

[0056] When the energy storage stack of the energy storage system experiences a Level 1 fault, which is the highest level of fault, its hard contacts change from a normally closed state to an open state or a normally open state to a closed state. The light emitter of the photoelectric conversion circuit changes from a light-emitting state to a non-light-emitting state or from a non-light-emitting state to a light-emitting state.

[0057] The working principle of the hard contact status detection board for energy storage stacks is as follows:

[0058] When any optical receiver on the hard contact status detection board of the energy storage stack has light input (or no light input), its output remains normally closed (or normally open), and none of the detected stacks have a Level 1 fault (the highest level fault). When any optical receiver on the hard contact status detection board of the energy storage stack has no light input (or has light input), its output changes from normally closed to open (or normally open to closed), and at least one of the detected stacks has a Level 1 fault (the highest level fault).

[0059] The principle of stack status coding on the hard contact status detection board of energy storage stack is as follows:

[0060] When the photoelectric interface of the hard contact status detection board of the energy storage stack in the energy storage system detects light input, its output is low; when the photoelectric interface of the hard contact status detection board of the energy storage stack in the pure energy system detects no light input, its output is high. The programmable chip of the hard contact status detection board of the energy storage stack in the energy storage system detects the level status of photoelectric interfaces 1 to n: low level is 0, high level is 1, and it encodes them into one or more arrays in the order from 1 to n. The programmable chip converts the parallel data into serial data and transmits it to the electro-optical conversion circuit, transmitting the status information of the energy storage stack to the PCS controller for backup.

[0061] In one embodiment of this application, the programmable chip defines a low level corresponding to the detection of light input by the photoelectric interface as 0 and a high level corresponding to the detection of no light input as 1. The level states are encoded into an n-bit binary data storage array in the order of photoelectric interface 1 to n. The parallel data in the array is then converted into serial data at a preset baud rate and transmitted to the PCS controller through the optical transmitter.

[0062] like Figure 3 As shown. The programmable chip on the hard contact status detection board of the energy storage stack in the energy storage system detects the level status of photoelectric interface 1 to photoelectric interface n: low level is 0, high level is 1, and it encodes one or more arrays in the order from 1 to n. The programmable chip converts the parallel data into serial data and transmits it to the electro-optical conversion circuit, and transmits the status information of the energy storage stack to the PCS controller for backup.

[0063] In one embodiment of this application, after receiving the main protection signal, the PCS controller immediately stops operating and records the fault information; after receiving the coded optical signal of the backup protection, it parses the number information of the faulty energy storage stack to analyze the cause of the energy storage system shutdown.

[0064] like Figure 3As shown. After receiving the main protection signal, the PCS controller immediately stops operating and records the fault information. Alternatively, after receiving the coded optical signal of the backup protection, the PCS controller parses the faulty energy storage stack number information to analyze the cause of the energy storage system shutdown.

[0065] In one embodiment of this application, several energy storage stacks of a high-voltage cascaded direct-connected energy storage system are distributed in multiple prefabricated compartments. Each prefabricated compartment is equipped with one of the aforementioned detection boards, and the detection boards of each prefabricated compartment are communicatively connected to the same PCS controller.

[0066] The high-voltage cascaded direct-connect energy storage system comprises several prefabricated compartments. Each compartment is equipped with a hard-connection status detection board for the energy storage stacks. The outputs of each detection board are connected in series or parallel to the PCS control system for corresponding protection and control. The H-bridge energy storage system comprises several energy storage stacks, which are distributed across several prefabricated compartments. For ease of wiring and use, each prefabricated compartment uses a single hard-connection status detection board for the hard connections of the energy storage stacks. The number of energy storage stacks that the hard-connection status detection board can simultaneously detect is no less than the number of energy storage stacks in a single prefabricated compartment.

[0067] A high-voltage cascaded direct-connect energy storage system comprises several energy storage stacks, distributed across multiple prefabricated modules. Each module contains anywhere from a few to a dozen energy storage stacks. The hard-contact status monitoring board for each energy storage stack can simultaneously monitor the hard-contact status of all stacks within a single prefabricated module. Each module is equipped with one hard-contact status monitoring board. The output signals from each monitoring board are connected in series or parallel to the PCS control system for appropriate protection and control. The hard-contact status monitoring board transmits information to the PCS control system via both output circuitry and optical communication. Output circuitry serves as the primary method, while optical communication is used as a backup, improving reliability.

[0068] This application embodiment also provides a hard-contact status detection device 200 for the energy storage stack of a high-voltage cascaded direct-connected energy storage system, such as... Figure 2 The diagram shows a schematic of the hard contact status detection device for the energy storage stack in a high-voltage cascaded direct-connected energy storage system according to an embodiment of this application. The hard contact status detection device 200 for the energy storage stack in the high-voltage cascaded direct-connected energy storage system includes at least: a level detection module 210, an output module 220, a protection signal module 230, a fault determination module 240, and a coding rule module 250, wherein:

[0069] In one embodiment of this application, the level detection module 210 is specifically used to: detect the level state of the optoelectronic interface through the programmable chip.

[0070] The programmable chip is used to detect the level status of the photoelectric interface. The programmable chip on the hard contact status detection board of the energy storage stack in the energy storage system detects the level status of photoelectric interface 1 to photoelectric interface n: low level is 0, high level is 1. It encodes one or more arrays in the order from 1 to n. The programmable chip converts parallel data into serial data and transmits it to the electro-optical conversion circuit. It transmits the status information of the energy storage stack to the PCS controller as a backup.

[0071] In one embodiment of this application, the output module 220 is specifically used for: the programmable chip controlling the output state of the detection board according to preset logic, and simultaneously encoding the photoelectric interface level state and converting it into an optical signal through an optical transmitter, and then transmitting it to the PCS controller through an optical fiber to determine the hard contact state of the energy storage stack.

[0072] The programmable chip on the hard contact detection board of the energy storage stack controls the output state of the output circuit according to the level state of its I / O ports and the control logic preset in the programmable chip programming program. Furthermore, the programmable chip on the hard contact detection board of the energy storage stack stores the state codes of the I / O ports in one or more data storage units according to the preset order of the I / O ports and the definition of the input level states of the I / O ports; finally, the programmable chip on the hard contact detection board of the energy storage stack converts the state code data of the I / O ports into serial data and transmits it to the PCS controller through an optical transmitter.

[0073] In one embodiment of this application, the protection signal module 230 is specifically used for: connecting the hard contact interface of the energy storage stack to an electro-optical conversion circuit, wherein the electro-optical conversion circuit converts the electrical signal of the hard contact interface into an optical signal and transmits it to the optical receiving interface of the detection board through an optical fiber; after receiving the optical signal, the detection board converts the optical signal into an electrical signal through an internal optical receiver and transmits it to the onboard programmable chip;

[0074] When there is no Level 1 fault in the energy storage stack, the hard contacts remain in the preset normally closed or normally open state, and the light emitter of the electro-optical conversion circuit remains in the corresponding light-emitting or non-light-emitting state. When a Level 1 fault occurs in the energy storage stack, the hard contacts switch from the normally closed state to the open state or from the normally open state to the closed state, and the light emitter simultaneously switches from the light-emitting state to the non-light-emitting state or from the non-light-emitting state to the light-emitting state.

[0075] In one embodiment of this application, the fault determination module 240 is specifically used to: determine that all the tested energy storage stacks have no level 1 fault when the optical receiver of the detection board detects light input or no light input, and the corresponding detection board output remains in a normally closed state or a normally open state; and determine that at least one of the tested energy storage stacks has a level 1 fault when any optical receiver of the detection board detects no light input or light input, and the corresponding detection board output switches from a normally closed state to an open state or from a normally open state to a closed state.

[0076] In one embodiment of this application, the encoding rule module 250 is specifically used for: the programmable chip defining the low level corresponding to the detection of light input by the photoelectric interface as 0 and the high level corresponding to the detection of no light input as 1, encoding the level state into an n-bit binary data storage array in the order of photoelectric interface 1 to n, and then converting the parallel data in the array into serial data according to a preset baud rate, and transmitting it to the PCS controller through the optical transmitter.

[0077] It is understood that the above-mentioned high-voltage cascaded direct-connected energy storage system's energy storage stack hard contact status detection device can realize each step of the energy storage stack hard contact status detection method provided in the foregoing embodiments. The relevant explanations regarding the high-voltage cascaded direct-connected energy storage system's energy storage stack hard contact status detection method are all applicable to the high-voltage cascaded direct-connected energy storage system's energy storage stack hard contact status detection device, and will not be repeated here.

[0078] Figure 4 This is a schematic diagram of the structure of an electronic device according to an embodiment of this application. Please refer to it. Figure 4 At the hardware level, the electronic device includes a processor, and optionally also includes an internal bus, a network interface, and memory. The memory may include main memory, such as high-speed random-access memory (RAM), or non-volatile memory, such as at least one disk drive. Of course, the electronic device may also include other hardware required for other business operations.

[0079] The processor, network interface, and memory can be interconnected via an internal bus, which can be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus, or an EISA (Extended Industry Standard Architecture) bus, etc. This bus can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 4 The symbol is represented by a single double-headed arrow, but this does not mean that there is only one bus or one type of bus.

[0080] Memory is used to store programs. Specifically, programs may include program code, which includes computer operation instructions. Memory may include main memory and non-volatile memory, and provides instructions and data to the processor.

[0081] The processor reads the corresponding computer program from non-volatile memory into main memory and then executes it, forming a hard-junction status detection device for the energy storage stack in a high-voltage cascaded direct-connected energy storage system at the logical level. The processor executes the program stored in memory and specifically performs the following operations:

[0082] The voltage level of the optoelectronic interface is detected by the programmable chip.

[0083] The programmable chip controls the output status of the detection board according to the preset logic, and at the same time encodes the photoelectric interface level status and converts it into an optical signal through the optical transmitter, and then transmits it to the PCS controller through the optical fiber to determine the hard contact status of the energy storage stack.

[0084] The above is as stated in this application. Figure 1The method executed by the hard contact status detection device of the energy storage stack in the high-voltage cascaded direct-connected energy storage system disclosed in the illustrated embodiment can be applied to a processor or implemented by a processor. The processor may be an integrated circuit chip with signal processing capabilities. During implementation, each step of the above method can be completed by integrated logic circuits in the processor's hardware or by instructions in software form. The processor can be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), etc.; it can also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in the embodiments of this application can be directly manifested as execution by a hardware decoding processor, or execution by a combination of hardware and software modules in the decoding processor. The software module can reside in a mature storage medium in the field, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, or registers. This storage medium is located in memory, and the processor reads information from the memory and, in conjunction with its hardware, completes the steps of the above method.

[0085] The electronic device can also perform Figure 1 A method for implementing the hard contact status detection device of the energy storage stack in a medium- and high-voltage cascaded direct-connected energy storage system, and to realize the hard contact status detection device of the energy storage stack in the high-voltage cascaded direct-connected energy storage system. Figure 1 The functions of the embodiments shown are not described in detail here.

[0086] This application also proposes a computer-readable storage medium that stores one or more programs, the programs including instructions that, when executed by an electronic device including multiple applications, enable the electronic device to perform... Figure 1 The method executed by the energy storage stack hard contact status detection device in the high-voltage cascaded direct-connected energy storage system shown in the embodiment is specifically used to perform the following:

[0087] The voltage level of the optoelectronic interface is detected by the programmable chip.

[0088] The programmable chip controls the output status of the detection board according to the preset logic, and at the same time encodes the photoelectric interface level status and converts it into an optical signal through the optical transmitter, and then transmits it to the PCS controller through the optical fiber to determine the hard contact status of the energy storage stack.

[0089] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0090] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0091] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0092] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0093] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0094] Memory may include non-persistent storage in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0095] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0096] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0097] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0098] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A method for detecting the hard-connection status of an energy storage stack in a high-voltage cascaded direct-connected energy storage system, applied to a detection system, the detection system comprising an energy storage stack, an electro-optical conversion circuit, an energy storage stack hard-connection status detection board, and a PCS controller; the hard-connection interface of the energy storage stack is connected to the electro-optical conversion circuit, and the electro-optical conversion circuit is connected to the photoelectric interface of the detection board via an optical fiber; the detection board comprises a light receiver, a light transmitter, a programmable chip, and an input quantity output circuit; the input quantity output circuit is connected to the input quantity detection circuit of the PCS controller via a shielded cable; the light transmitter is connected to the light receiver circuit of the PCS controller via an optical fiber, characterized in that... The method includes: The voltage level of the optoelectronic interface is detected by the programmable chip. The programmable chip controls the output status of the detection board according to the preset logic, and at the same time encodes the photoelectric interface level status and converts it into an optical signal through the optical transmitter, and then transmits it to the PCS controller through the optical fiber to determine the hard contact status of the energy storage stack.

2. The method as described in claim 1, characterized in that, The method further includes: The output signal from the detection board received by the PCS controller through the input signal detection circuit is used as the main protection signal. The output signal is the signal output by the programmable chip in claim 1 according to the preset logic. The coded optical signal received by the PCS controller through the optical receiving circuit is used as a backup protection signal, and the coded optical signal is the signal after encoding the photoelectric interface level state in claim 1; Based on the status of the main protection signal and the backup protection signal, the shutdown protection of the high-voltage cascaded direct-connected energy storage system is executed.

3. The method as described in claim 1, characterized in that, The hard-contact interface of the energy storage stack is connected to the electro-optical conversion circuit. The electro-optical conversion circuit converts the electrical signal of the hard-contact interface into an optical signal, which is then transmitted to the optical receiving interface of the detection board via optical fiber. After receiving the optical signal, the detection board converts the optical signal into an electrical signal through its internal optical receiver and transmits it to the onboard programmable chip. When there is no Level 1 fault in the energy storage stack, the hard contacts remain in the preset normally closed or normally open state, and the light emitter of the electro-optical conversion circuit remains in the corresponding light-emitting or non-light-emitting state. When a Level 1 fault occurs in the energy storage stack, the hard contacts switch from the normally closed state to the open state or from the normally open state to the closed state, and the light emitter simultaneously switches from the light-emitting state to the non-light-emitting state or from the non-light-emitting state to the light-emitting state.

4. The method as described in claim 3, characterized in that, When the optical receiver of the detection board detects light input or no light input, and the corresponding output of the detection board remains in a normally closed or normally open state, it is determined that all the energy storage stacks under test have no level 1 fault; when any optical receiver of the detection board detects no light input or light input, and the corresponding output of the detection board switches from a normally closed state to an open state or from a normally open state to a closed state, it is determined that at least one of the energy storage stacks under test has experienced a level 1 fault.

5. The method as described in claim 1, characterized in that, The programmable chip defines a low level corresponding to the detection of light input by the photoelectric interface as 0 and a high level corresponding to the detection of no light input as 1. The level states are encoded into an n-bit binary data storage array in the order of photoelectric interface 1 to n. The parallel data in the array is then converted into serial data at a preset baud rate and transmitted to the PCS controller through the optical transmitter.

6. The method as described in claim 2, characterized in that, Upon receiving the main protection signal, the PCS controller immediately stops operation and records the fault information; upon receiving the coded optical signal of the backup protection, it parses the faulty energy storage stack number information to analyze the cause of the energy storage system shutdown.

7. The method as described in claim 1, characterized in that, Several energy storage stacks of the high-voltage cascaded direct-connected energy storage system are distributed in multiple prefabricated compartments. Each prefabricated compartment is equipped with one of the aforementioned detection boards, and the detection boards of each prefabricated compartment are all communicatively connected to the same PCS controller.

8. A device for detecting the hard contact status of a high-voltage cascaded direct-connected energy storage system's energy storage stack, applied to a detection system. The detection system includes an energy storage stack, an electro-optical conversion circuit, a detection board, and a PCS controller. The hard contact interface of the energy storage stack is connected to the electro-optical conversion circuit, and the electro-optical conversion circuit is connected to the photoelectric interface of the detection board via an optical fiber. The detection board includes a light receiver, a light transmitter, a programmable chip, and an input quantity output circuit. The input quantity output circuit is connected to the input quantity detection circuit of the PCS controller via a shielded cable. The light transmitter is connected to the light receiver circuit of the PCS controller via an optical fiber. The device is characterized in that... The device includes: A level detection module is used to detect the level status of the optoelectronic interface through the programmable chip; The output module is used to control the output status of the detection board according to the preset logic of the programmable chip, and at the same time encodes the photoelectric interface level status and converts it into an optical signal through the optical transmitter, and then transmits it to the PCS controller through the optical fiber to determine the hard contact status of the energy storage stack. The protection signal module is used to take the output signal from the detection board received by the PCS controller through the input detection circuit as the main protection signal, and the coded optical signal received by the PCS controller through the optical receiving circuit as the backup protection signal, and to perform shutdown protection of the energy storage system according to the signal status. The fault determination module is used to determine whether the energy storage stack has experienced a first-level fault based on the optical input status and output status of the optical receiver on the detection board. The encoding rule module is used to encode the optoelectronic interface level status into a binary data storage array through a programmable chip, and to convert parallel data into serial data before transmitting it to the PCS controller.

9. An electronic device, characterized in that, include: processor; as well as A memory configured to store computer-executable instructions, which, when executed, cause the processor to perform the method of any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores one or more programs that, when executed by an electronic device including a plurality of applications, cause the electronic device to perform the method of any one of claims 1 to 7.

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