Cascade energy storage converter ring optical fiber communication communication interruption positioning method and device

Abstract

The application discloses a communication interruption positioning method and device for ring optical fiber communication of a cascade energy storage converter, the method comprising: in response to power-on or normal communication of the cascade energy storage converter, determining that a communication fault occurs and identifying a node of the ring optical fiber communication link where the communication interruption occurs according to a received power unit module address code, in a case where normal communication is not established with a power unit module of the ring optical fiber communication link; and in response to power-on or normal communication of the cascade energy storage converter, determining that an uplink communication fault occurs in the ring optical fiber communication link, in a case where data sent by a last power unit module of the ring optical fiber communication link is not received. The application can accurately position the node position of the communication interruption when an uplink communication fault or a communication fault occurs in the ring optical fiber communication link of the cascade energy storage converter.

Description

Technical Field

[0001] This application relates to the field of communication technology for energy storage systems, and in particular to a communication interruption location method and apparatus for ring optical fiber communication of cascaded energy storage converters. Background Technology

[0002] Renewable energy sources such as wind and solar power inherently suffer from low energy density and high volatility, exhibiting characteristics such as randomness, intermittency, and fluctuation. Large-scale grid integration poses significant challenges to the stable operation of the power system. Energy storage technology acts as a "voltage stabilizer" in the new energy era, buffering and regulating energy production and consumption. It effectively addresses the intermittency of new energy power generation, ensuring the safe and stable operation of the power system and providing crucial support for building a new type of power system.

[0003] The new power system is characterized by a high proportion of renewable energy and a high proportion of power electronic equipment, which places higher demands on its stability and reliability, and increases the need for rapid and flexible resource allocation regulation. Energy storage technology plays an important role in improving the absorption of renewable energy sources such as wind power and photovoltaics, alleviating peak-shaving pressure, and smoothing renewable energy output. It is one of the key technologies for promoting the efficient use of renewable energy, and can also enhance the flexible regulation capability of the power system and ensure the safe and stable operation of the power grid.

[0004] Cascaded energy storage converters are key equipment in cascaded high-voltage direct-connected energy storage systems. The mainstream communication methods between the controller and power unit modules of cascaded energy storage converters include: the controller communicates with each power unit module using two optical fibers. One optical fiber transmits the control signals and PWM signals sent by the controller to the power unit modules, and the other optical fiber transmits the DC voltage signals and unit module status signals sent by the power unit modules to the controller.

[0005] As an innovation in the mainstream communication technology of existing cascaded energy storage converters, the ring fiber optic communication technology can reduce the overall amount of communication fiber between the controller and the power unit module, reduce the overall amount of optical transceivers used in the controller, simplify the controller hardware circuit scheme and shorten the design cycle, reduce the workload of laying communication fiber optics in the field installation of energy storage systems, and reduce the hardware cost of cascaded energy storage converters. In the future, it will become the mainstream communication technology for cascaded energy storage converters.

[0006] While the ring fiber optic communication technology solution for cascaded energy storage converters has many advantages, it also brings a technical challenge: if the communication link of the ring fiber optic communication link is interrupted, the controller will not be able to receive the status information of all power unit modules of the ring fiber optic communication link, and the controller will not be able to effectively determine the location of the communication interruption node of the ring fiber optic communication link. Summary of the Invention

[0007] This application provides a method and apparatus for locating communication interruptions in the ring fiber optic communication of a cascaded energy storage converter, which can accurately locate the communication interruption node when an uplink communication failure or a communication failure occurs in the ring fiber optic communication link of the cascaded energy storage converter.

[0008] The embodiments of this application adopt the following technical solutions:

[0009] In a first aspect, embodiments of this application provide a communication interruption location method for a ring fiber optic communication in a cascaded energy storage converter, wherein the method is applied to a controller of the cascaded energy storage converter, and the communication interruption location method includes:

[0010] In response to the power-on or normal communication process of the cascaded energy storage converter, if normal communication is not established with the power unit module of the ring fiber optic communication link, a communication fault is determined, and the node where the communication interruption occurred in the ring fiber optic communication link is identified based on the received power unit module address code; and

[0011] In response to the power-on or normal communication process of the cascaded energy storage converter, if no data is received from the power unit module at the end of the ring fiber optic communication link, it is determined that an uplink communication failure has occurred in the ring fiber optic communication link.

[0012] In some embodiments, determining that an uplink communication failure has occurred in the ring fiber optic communication link in response to the power-on or normal communication process of the cascaded energy storage converter, when no data is received from the power unit module at the end of the ring fiber optic communication link, includes:

[0013] If the cascaded energy storage converter does not receive data from the power unit module at the end of the ring fiber communication link after being powered on, the uplink communication failure and the corresponding communication interruption node of the ring fiber communication link shall be determined according to the ring fiber communication protocol.

[0014] At this time, the communication interruption node includes at least one of the following situations: the optical transmitting circuit of the control board of the power unit module at the end of the ring optical fiber communication link, the optical fiber between the power unit module at the end of the ring optical fiber communication link and the controller, or the optical receiving circuit of the controller of the ring optical fiber communication link is damaged.

[0015] In some embodiments, the step of determining a communication failure and identifying the node in the ring fiber optic communication link that has experienced a communication interruption based on the received power unit module address code, in response to the power-on or normal communication process of the cascaded energy storage converter, when normal communication with the power unit module of the ring fiber optic communication link has not been established, includes:

[0016] If the cascaded energy storage converter fails to establish normal communication with the power unit module of the ring optical fiber communication link after being powered on, it is considered to have a communication failure.

[0017] At this time, the communication interruption node includes at least one of the following situations: the optical transmitting circuit of the control board of the power unit module coded as mk, the optical fiber between the power unit body coded as mk and the power unit module coded as m-k+1 is damaged; the optical transmitting circuit of the control board of the power unit module coded as mk, the optical receiving loop between the power unit body coded as mk and the power unit module coded as m-k+1 is damaged.

[0018] In some embodiments, determining that an uplink communication failure has occurred in the ring fiber optic communication link in response to the power-on or normal communication process of the cascaded energy storage converter, when no data is received from the power unit module at the end of the ring fiber optic communication link, includes:

[0019] During normal communication of the cascaded energy storage converter, an uplink communication failure occurs. At this time, the communication interruption node includes at least one of the following: the optical transmitting circuit of the control board of the last power unit module of the ring optical fiber communication link is damaged; the optical fiber between the last power unit module of the ring optical fiber communication link and the controller is damaged; the optical transmitting circuit of the control board of the last power unit module of the ring optical fiber communication link is damaged; the optical receiving circuit between the last power unit module of the ring optical fiber communication link and the controller of the ring optical fiber communication link is damaged.

[0020] In some embodiments, the step of determining a communication failure and identifying the node in the ring fiber optic communication link that has experienced a communication interruption based on the received power unit module address code, in response to the power-on or normal communication process of the cascaded energy storage converter, when normal communication with the power unit module of the ring fiber optic communication link has not been established, includes:

[0021] During normal communication, the cascaded energy storage converter experiences a communication failure. Based on the received power unit module address code k, the power unit module located at the front end of the ring fiber optic communication link is identified as m-k+1, and this power unit module m-k+1 is displayed as a communication interruption fault node.

[0022] At this time, the communication interruption node includes at least one of the following situations: the optical transmitting circuit of the control board of the power unit module coded as mk, the optical fiber between the power unit body coded as mk and the power unit module coded as m-k+1 is damaged; the optical transmitting circuit of the control board of the power unit module coded as mk, the optical receiving loop between the power unit body coded as mk and the power unit module coded as m-k+1 is damaged.

[0023] In some embodiments, prior to the power-on or normal communication process of the cascaded energy storage converter, the method further includes:

[0024] Arrange the communication optical fibers of the cascaded energy storage converter;

[0025] There are n ring-shaped optical fiber communication links between the controller and the power unit modules of the cascaded energy storage converter. Each ring-shaped optical fiber communication link contains m power unit modules, which are labeled as power unit module 1, power unit module 2, ..., power unit module m, respectively.

[0026] Taking the first ring-shaped optical fiber communication link as an example, the optical transmitter TX_1 of the controller of the cascaded energy storage converter is connected to the optical receiver RX of the power unit module 1 via optical fiber, and the optical transmitter TX of the power unit module 1 is connected to the optical receiver RX of the power unit module 2 via optical fiber.

[0027] Similarly, the optical transmitter TX of the power unit module m is connected to the optical receiver RX_1 of the controller of the energy storage converter via optical fiber; similarly, the second ring optical fiber communication link, ..., the nth ring optical fiber communication link adopt the same optical fiber connection method.

[0028] In some embodiments, the method further includes:

[0029] The power unit module address code of the cascaded energy storage converter ring optical fiber communication link is automatically allocated and transmitted. After the communication optical fiber of the cascaded energy storage converter is arranged and powered on, the power unit module address code 1 and the control data of all unit modules of the ring optical fiber communication link are sent to the power unit module 1 of the ring optical fiber communication link.

[0030] Power unit module 1 receives power unit module address code 1 and control data of all unit modules in the ring optical fiber communication link sent by the controller. It first latches power unit module address code 1 and then transmits data to the next level power unit module. The data includes the address 2 of the next level power unit module.

[0031] Similarly, power unit module m first latches the power unit module address code m and then transmits the data, which includes the power unit module address code m+1.

[0032] In some embodiments, the step of responding to the power-on or normal communication process of the cascaded energy storage converter, in the event that normal communication has not been established with the power unit module of the ring fiber optic communication link, determining that a communication failure has occurred and identifying the node in the ring fiber optic communication link that has experienced a communication interruption based on the received power unit module address code, includes:

[0033] After the cascaded energy storage converter is powered on, if a communication failure occurs when the power unit module of the ring optical fiber communication link fails to establish normal communication with the controller, the power unit module after the communication interruption node simulates the controller to send the unit module address code 1 and fixed data to the next stage power unit module. The next stage power unit module receives the unit module address code 1 and fixed data sent by the previous stage power unit module and latches the unit module address code 1. Then, it sends the unit module address 2 and fixed data to the next stage power unit module.

[0034] Similarly, the power unit module m sends the power unit module address code k and fixed data to the controller;

[0035] The node where communication was interrupted in the ring fiber optic communication link was identified based on the received power unit module address code k.

[0036] In some embodiments, the step of determining a communication failure and identifying the node in the ring fiber optic communication link that has experienced a communication interruption based on the received power unit module address code, in response to the power-on or normal communication process of the cascaded energy storage converter, when normal communication with the power unit module of the ring fiber optic communication link has not been established, includes:

[0037] If a communication failure occurs during normal communication of the cascaded energy storage converter, the analog controller of the power unit module after the communication interruption node sends the unit module address code 1 and fixed data to the next stage power unit module. The next stage power unit module receives the unit module address code 1 and fixed data sent by the previous stage power unit module and latches the unit module address code 1. Then, it sends the unit module address 2 and fixed data to the next stage power unit module.

[0038] Similarly, power unit module m sends power unit module address code k and fixed data to the controller;

[0039] The node where communication was interrupted in the ring fiber optic communication link was identified based on the received power unit module address code k.

[0040] Secondly, embodiments of this application also provide a communication interruption location device for ring fiber optic communication of a cascaded energy storage converter, wherein the controller applied to the cascaded energy storage converter includes:

[0041] The first module, in response to the power-on or normal communication process of the cascaded energy storage converter, determines a communication failure and identifies the node in the ring fiber optic communication link where communication has been interrupted based on the received power unit module address code when normal communication with the power unit module in the ring fiber optic communication link has not been established; and

[0042] The second module is used to respond to the power-on or normal communication process of the cascaded energy storage converter, and determine that the uplink communication link has failed if it does not receive data sent by the power unit module at the end of the ring fiber communication link.

[0043] 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.

[0044] 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.

[0045] The at least one technical solution adopted in this application embodiment can achieve the following beneficial effects: the method is applied to the controller of a cascaded energy storage converter, and the communication interruption location method includes: in response to the power-on or normal communication process of the cascaded energy storage converter, if normal communication is not established with the power unit module of the ring fiber optic communication link, determining that a communication fault has occurred and identifying the node in the ring fiber optic communication link where communication has been interrupted based on the received power unit module address code; and in response to the power-on or normal communication process of the cascaded energy storage converter, if no data is received from the power unit module at the end of the ring fiber optic communication link, determining that an uplink communication fault has occurred in the ring fiber optic communication link. Through the above, the location of the communication interruption node is accurately located when an uplink communication fault or a communication fault occurs in the ring fiber optic communication link of the cascaded energy storage converter. Attached Figure Description

[0046] 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:

[0047] Figure 1 This is a schematic diagram of the ring optical fiber communication principle of the cascaded energy storage converter in this embodiment of the application;

[0048] Figure 2 This is a schematic diagram of the communication interruption location method for the ring optical fiber communication of the cascaded energy storage converter in this application embodiment;

[0049] Figure 3 This is a schematic diagram illustrating the normal communication principle of the ring fiber optic communication link of the cascaded energy storage converter in this embodiment of the application.

[0050] Figure 4This is a schematic diagram illustrating the uplink communication failure of the ring fiber optic communication link of the cascaded energy storage converter in this embodiment of the application.

[0051] Figure 5 This is a schematic diagram illustrating the communication failure of the ring fiber optic communication link in the cascaded energy storage converter in this embodiment of the application.

[0052] Figure 6 This is a schematic diagram of the communication interruption location device for the ring optical fiber communication of the cascaded energy storage converter in this application embodiment;

[0053] Figure 7 This is a schematic diagram of the structure of an electronic device according to an embodiment of this application. Detailed Implementation

[0054] 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. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0055] Cascaded high-voltage direct-connected energy storage systems are an advanced energy storage technology with advantages such as high safety, high efficiency, fast response speed, large single-unit capacity, and long system life, representing an important development direction for energy storage technology. The cascaded energy storage converter is a key component of the cascaded high-voltage direct-connected energy storage system. Currently, the mainstream communication method between the controller and power unit modules of the cascaded energy storage converter is as follows: communication between the controller and all power unit modules uses two optical fibers, one for transmitting and one for receiving. The number of communication fibers is twice the number of power unit modules. The controller and power unit modules are located in different prefabricated cabins or different positions within buildings. This results in a large number of optical transceivers for the controller and a large number of communication fibers, increasing product costs and the difficulty of laying communication fibers. The proposed innovative communication method between the controller and power unit modules of the cascaded energy storage converter, using a ring-shaped optical fiber communication approach, reduces the overall number of communication fibers and optical transceivers used in the controller, simplifies the controller hardware circuitry, lowers the hardware cost of the cascaded energy storage converter, and improves production efficiency. This method is expected to become the mainstream communication technology for cascaded energy storage converters in the future.

[0056] The main technical challenge of using ring fiber optic communication technology in cascaded energy storage converters is to quickly and accurately locate the communication interruption point when the ring fiber optic communication link is interrupted, so that operation and maintenance personnel can carry out inspection and maintenance, thereby minimizing the downtime of the energy storage system.

[0057] Few companies employ ring fiber optic communication technology in cascaded multilevel converters, and research on this technology is also limited. One related technology discloses a method for accurate fault location in multiple units using ring fiber optic communication. This method identifies the faulty power unit at the very beginning of the ring fiber optic communication loop through the main controller, achieving precise fault location and solving the technical problem of difficulty in troubleshooting caused by all power units after the faulty node being identified as faulty nodes. However, this method suffers from a mismatch between the communication address stored in the power unit and its position within the ring fiber optic communication loop, leading to a discrepancy between the controller's fault location and the actual fault location.

[0058] The technical solutions provided by the various embodiments of this application are described in detail below with reference to the accompanying drawings.

[0059] like Figure 1 The diagram shows the schematic of the ring fiber optic communication for a cascaded energy storage converter. There are n ring fiber optic communication links between the controller and power unit modules of the cascaded energy storage converter. Each ring fiber optic communication link contains m power unit modules, labeled as power unit module 1, power unit module 2, ..., power unit module m. Taking the first ring fiber optic communication link as an example, the optical transmitter TX_1 of the controller of the cascaded energy storage converter is connected to the optical receiver RX of power unit module 1 via optical fiber. The optical transmitter TX of power unit module 1 is connected to the optical receiver RX of power unit module 2 via optical fiber, and so on. The optical transmitter TX of power unit module m is connected to the optical receiver RX_1 of the controller of the energy storage converter via optical fiber. Similarly, the second, ..., and nth ring fiber optic communication links use the same optical fiber connection method.

[0060] This application provides a communication interruption location method for a cascaded energy storage converter's ring fiber optic communication, applied to the controller of the cascaded energy storage converter, such as... Figure 2 The diagram illustrates a communication interruption location method for a cascaded energy storage converter's ring fiber optic communication in this embodiment of the application. The method includes at least the following steps S210 to S220:

[0061] Step S210: In response to the power-on or normal communication process of the cascaded energy storage converter, if normal communication is not established with the power unit module of the ring fiber optic communication link, a communication fault is determined and the node where the communication of the ring fiber optic communication link is interrupted is identified according to the received power unit module address code.

[0062] One scenario is that after the cascaded energy storage converter is powered on, if the controller cannot receive the data sent by the power unit module at the end of the ring fiber optic communication link, the controller determines that the uplink communication of the ring fiber optic communication link is faulty.

[0063] Another scenario is that after the cascaded energy storage converter is powered on, if a communication failure occurs before the power unit module and controller of the ring fiber optic communication link are established, the power unit module after the communication interruption node simulates the controller and sends the unit module address code 1 and fixed data to the next stage power unit module. The next stage power unit module receives the unit module address code 1 and fixed data sent by the previous stage power unit module and latches the unit module address code 1. Then, it sends the unit module address 2 and fixed data to the next stage power unit module. And so on, the power unit module m sends the power unit module address code k and fixed data to the controller. The controller identifies the communication interruption node of the ring fiber optic communication link based on the received power unit module address code k.

[0064] In step S220, in response to the power-on or normal communication process of the cascaded energy storage converter, if no data is received from the power unit module at the end of the ring fiber communication link, it is determined that an uplink communication failure has occurred in the ring fiber communication link.

[0065] One scenario is that during normal communication of a cascaded energy storage converter, if the controller cannot receive data sent by the power unit module at the end of the ring fiber optic communication link, the controller determines that the uplink communication of the ring fiber optic communication link is faulty.

[0066] Another scenario involves a communication failure occurring during normal communication of the cascaded energy storage converter. In this case, the power unit module analog controller after the communication interruption node sends unit module address code 1 and fixed data to the next-stage power unit module. The next-stage power unit module receives and latches the unit module address code 1 sent by the previous-stage power unit module, and then sends unit module address code 2 and fixed data to the next-stage power unit module. This process continues, with power unit module m sending power unit module address code k and fixed data to the controller. The controller identifies the communication interruption node in the ring fiber optic communication link based on the received power unit module address code k.

[0067] The above method can accurately locate the communication interruption node when an uplink communication failure or a communication failure occurs in the ring fiber optic communication link of a cascaded energy storage converter.

[0068] The above method employs a power unit module analog controller that sends power unit module address codes and fixed data. When a communication failure occurs in the ring fiber optic communication link, the power unit module analog controller after the communication interruption node sends unit module address code 1 and fixed data to the next-level power unit module. The next-level power unit module receives the unit module address code 1 and fixed data sent by the previous-level power unit module and latches the unit module address code 1. Then, it sends unit module address 2 and fixed data to the next-level power unit module. This process continues, with power unit module m sending power unit module address code k and fixed data to the controller. The controller receives the power unit module address code k and fixed data sent by the power unit module at the very end of the ring fiber optic communication link. Based on the received power unit module address code k, the controller identifies the code of the power unit module at the very beginning of the ring fiber optic communication link as m-k+1 and displays this power unit module as a communication interruption fault node, independent of the address code of the power unit module during normal communication of the ring fiber optic communication link.

[0069] The above method employs different fault location methods for two types of communication faults in the ring fiber optic communication link of the cascaded energy storage converter. For uplink communication faults in the ring fiber optic communication link, the controller directly locates the fault node. For communication faults in the ring fiber optic communication link, the power unit module after the communication interruption node simulates the controller function, forming a new communication link with the power unit module after the communication interruption node and the controller. The controller identifies the code of the power unit module at the front end of the ring fiber optic communication link based on the received power unit module address code and displays this power unit module as a communication interruption fault node.

[0070] In one embodiment of this application, the step of determining an uplink communication failure in the ring fiber communication link in response to the power-on or normal communication process of the cascaded energy storage converter when no data is received from the power unit module at the end of the ring fiber communication link includes: after the cascaded energy storage converter is powered on, if no data is received from the power unit module at the end of the ring fiber communication link, determining the uplink communication failure and the corresponding communication interruption node according to the ring fiber communication protocol; at this time, the communication interruption node includes at least one of the following situations: the optical transmitting circuit of the control board of the power unit module at the end of the ring fiber communication link, the optical fiber between the power unit module at the end of the ring fiber communication link and the controller, or the optical receiving circuit of the controller of the ring fiber communication link is damaged.

[0071] like Figure 1 and Figure 3As shown, after the cascaded energy storage converter is powered on, if the controller cannot receive the data sent by the power unit module at the end of the ring fiber optic communication link, the controller determines that the uplink communication of the ring fiber optic communication link is faulty according to the ring fiber optic communication protocol. The communication interruption nodes are: the optical transmitting circuit of the control board of the power unit module at the end of the ring fiber optic communication link, the optical fiber between the power unit module at the end of the ring fiber optic communication link and the controller, or the optical receiving circuit of the controller of the ring fiber optic communication link is damaged, so that operation and maintenance personnel can carry out inspection and maintenance.

[0072] In one embodiment of this application, the step of determining a communication failure and identifying the node where communication is interrupted in the ring fiber optic communication link when normal communication is not established with the power unit module of the cascaded energy storage converter during power-on or normal communication process includes: after the cascaded energy storage converter is powered on, if normal communication is not established with the power unit module of the ring fiber optic communication link, a communication failure is considered to have occurred; at this time, the communication interruption node includes at least one of the following situations: the optical transmitting circuit of the control board of the power unit module coded as mk, the optical fiber between the power unit body coded as mk and the power unit module coded as m-k+1 is damaged; the optical transmitting circuit of the control board of the power unit module coded as mk, the optical receiving circuit between the power unit body coded as mk and the power unit module coded as m-k+1 is damaged.

[0073] like Figure 5 As shown, after the cascaded energy storage converter is powered on, if a communication failure occurs when the power unit module and the controller of the ring fiber optic communication link fail to establish normal communication, the power unit module after the communication interruption node simulates the controller and sends the unit module address code 1 and fixed data to the next stage power unit module. The next stage power unit module receives the unit module address code 1 sent by the previous stage power unit module and latches the unit module address code 1, and then sends the unit module address 2 and fixed data to the next stage power unit module; and so on, with power unit module m sending the power unit module address code k and fixed data to the controller; the controller receives the last power unit module address code k from the ring fiber optic communication link. The power unit module at the end sends its address code k and fixed data. Based on the received address code k, the controller identifies the power unit module at the very front of the ring fiber optic communication link as coded m-k+1, and displays this power unit module m-k+1 as a communication interruption fault node. Communication interruption node: damage exists in the optical transmitting circuit of the control board of the power unit module coded mk, the optical fiber between the power unit module coded mk and the power unit module coded m-k+1, or the optical receiving circuit of the power unit module coded m-k+1, so that operation and maintenance personnel can carry out inspection and maintenance.

[0074] In one embodiment of this application, the determination that an uplink communication failure has occurred in the ring fiber optic communication link in response to the power-on or normal communication process of the cascaded energy storage converter when no data is received from the power unit module at the end of the ring fiber optic communication link includes: an uplink communication failure occurs during the normal communication process of the cascaded energy storage converter, and the communication interruption node includes at least one of the following: the optical transmitting circuit of the control board of the power unit module at the end of the ring fiber optic communication link is damaged, or the optical fiber between the power unit module at the end of the ring fiber optic communication link and the controller is damaged; or the optical transmitting circuit of the control board of the power unit module at the end of the ring fiber optic communication link is damaged, or the optical receiving circuit between the power unit module at the end of the ring fiber optic communication link and the controller of the ring fiber optic communication link is damaged.

[0075] like Figure 4 As shown, an uplink communication failure occurred during normal communication of the cascaded energy storage converter. The communication interruption nodes are: the optical transmitting circuit of the control board of the power unit module at the end of the ring optical fiber communication link, the optical fiber between the power unit module at the end of the ring optical fiber communication link and the controller, or the optical receiving circuit of the controller of the ring optical fiber communication link. Operation and maintenance personnel need to carry out inspection and maintenance.

[0076] In one embodiment of this application, the step of responding to the power-on or normal communication process of the cascaded energy storage converter, and determining a communication failure and identifying the node where the communication of the ring fiber optic communication link is interrupted based on the received power unit module address code when normal communication with the power unit module in the ring fiber optic communication link is not established, includes: when a communication failure occurs during the normal communication process of the cascaded energy storage converter, the power unit module located at the front end of the ring fiber optic communication link is identified as coded as m-k+1 based on the received power unit module address code k, and this power unit module m-k+1 is displayed as a communication interruption fault node; at this time, the communication interruption node includes at least one of the following situations: the optical transmitting circuit of the control board of the power unit module coded as mk, the optical fiber between the power unit body coded as mk and the power unit module coded as m-k+1 is damaged; the optical transmitting circuit of the control board of the power unit module coded as mk, the optical receiving circuit between the power unit body coded as mk and the power unit module coded as m-k+1 is damaged.

[0077] like Figure 4As shown, a communication failure occurs during normal communication of the cascaded energy storage converter. The power unit module analog controller after the communication interruption node sends unit module address code 1 and fixed data to the next-stage power unit module. The next-stage power unit module receives and latches unit module address code 1 from the previous-stage power unit module, and then sends unit module address code 2 and fixed data to the next-stage power unit module; and so on. Power unit module m sends power unit module address code k and fixed data to the controller; the controller receives power unit module address code k from the power unit module at the very end of the loop fiber optic communication link. The controller uses the received power unit module address code k and fixed data to identify the power unit module located at the front end of the ring fiber optic communication link as coded m-k+1, and displays this power unit module m-k+1 as a communication interruption fault node. Communication interruption node: The optical transmitting circuit of the control board of the power unit module coded mk, the optical fiber between the power unit module coded mk and the power unit module coded m-k+1, or the optical receiving circuit of the power unit module coded m-k+1 is damaged, so that operation and maintenance personnel can carry out inspection and maintenance.

[0078] It should be noted that the control board of the power unit module of the cascaded energy storage converter ring fiber optic communication link uses a programmable logic device (FPGA) as the control chip, and the optical transceiver control of the controller of the cascaded energy storage converter ring fiber optic communication link also uses a programmable logic device (FPGA) as the control chip.

[0079] In one embodiment of this application, before responding to the power-on or normal communication process of the cascaded energy storage converter, the method further includes: arranging the communication optical fibers of the cascaded energy storage converter; there are n ring-shaped optical fiber communication links between the controller and the power unit modules of the cascaded energy storage converter, and each ring-shaped optical fiber communication link contains m power unit modules, respectively labeled as power unit module 1, power unit module 2, ..., power unit module m; taking the first ring-shaped optical fiber communication link as an example, the optical transmitter TX_1 of the controller of the cascaded energy storage converter is connected to the optical receiver RX of power unit module 1 via optical fiber, and the optical transmitter TX of power unit module 1 is connected to the optical receiver RX of power unit module 2 via optical fiber; and so on, the optical transmitter TX of power unit module m is connected to the optical receiver RX_1 of the controller of the energy storage converter via optical fiber; and so on, the second ring-shaped optical fiber communication link, ..., the nth ring-shaped optical fiber communication link adopt the same optical fiber connection method.

[0080] like Figure 1The diagram shows the schematic of the ring fiber optic communication for a cascaded energy storage converter. There are n ring fiber optic communication links between the controller and power unit modules of the cascaded energy storage converter. Each ring fiber optic communication link contains m power unit modules, labeled as power unit module 1, power unit module 2, ..., power unit module m. Taking the first ring fiber optic communication link as an example, the optical transmitter TX_1 of the controller of the cascaded energy storage converter is connected to the optical receiver RX of power unit module 1 via optical fiber. The optical transmitter TX of power unit module 1 is connected to the optical receiver RX of power unit module 2 via optical fiber, and so on. The optical transmitter TX of power unit module m is connected to the optical receiver RX_1 of the controller of the energy storage converter via optical fiber. Similarly, the second, ..., and nth ring fiber optic communication links use the same optical fiber connection method.

[0081] In one embodiment of this application, the method further includes: automatic allocation and data transmission of power unit module address codes for the cascaded energy storage converter's ring fiber optic communication link. After the communication fiber of the cascaded energy storage converter is laid out and powered on, it sends power unit module address code 1 and control data of all unit modules of the ring fiber optic communication link to power unit module 1 of the ring fiber optic communication link. Power unit module 1 receives power unit module address code 1 and control data of all unit modules of the ring fiber optic communication link sent by the controller, first latches power unit module address code 1, and then transmits data to the next-level power unit module. The data includes the address 2 of the next-level power unit module. And so on, power unit module m first latches power unit module address code m and then transmits data. The data includes power unit module address code m+1.

[0082] like Figure 3 The diagram illustrates the principle of normal communication in a cascaded energy storage converter's ring fiber optic communication link. The controller of the cascaded energy storage converter sends power unit module address code 1 and control data from all power unit modules in the ring fiber optic communication link to power unit module 1. Power unit module 1 receives the power unit module address code 1 and control data from all power unit modules in the ring fiber optic communication link sent by the controller. Power unit module 1 first latches power unit module address code 1, and then transmits data to the next-level power unit module according to the agreed-upon timing. The data includes the next-level power unit module address code 2. Similarly, power unit module m receives data transmitted from power unit module m-1. Power unit module m first latches power unit module address code m, and then transmits data to the controller according to the agreed-upon timing. The data includes power unit module address code m+1. The controller receives the power unit module address code m+1 and data sent by the last power unit module m in the ring fiber optic communication link, and determines that the ring fiber optic communication link is communicating normally according to the ring fiber optic communication protocol.

[0083] In one embodiment of this application, the step of responding to the power-on or normal communication process of the cascaded energy storage converter, in the event that normal communication has not been established with the power unit modules of the ring fiber optic communication link, determining a communication failure and identifying the node where the ring fiber optic communication link has been interrupted based on the received power unit module address code, includes: after the cascaded energy storage converter is powered on, if a communication failure occurs when the power unit modules of the ring fiber optic communication link have not established normal communication with the controller, then the power unit module after the communication interruption node simulates the controller to send unit module address code 1 and fixed data to the next-level power unit module. The next-level power unit module receives the unit module address code 1 and fixed data sent by the previous-level power unit module and latches the unit module address code 1, and then sends unit module address 2 and fixed data to the next-level power unit module; and so on, the power unit module m sends the power unit module address code k and fixed data to the controller; and the node where the ring fiber optic communication link has been interrupted is identified based on the received power unit module address code k.

[0084] like Figure 4 The diagram illustrates the principle of uplink communication failure in the ring fiber optic communication link of a cascaded energy storage converter. After the cascaded energy storage converter is powered on, if the controller cannot receive the power unit module address code m+1 and data sent by the power unit module m at the end of the ring fiber optic communication link, or if the cascaded energy storage converter cannot receive the power unit module address code m+1 and data sent by the power unit module m at the end of the ring fiber optic communication link during normal communication, the controller determines that the uplink communication of the ring fiber optic link has failed according to the communication protocol of the ring fiber optic communication. Communication interruption points include: damage to the optical transmitting circuit of the control board of the power unit module at the end of the ring fiber optic communication link, damage to the optical fiber between the power unit module at the end of the ring fiber optic communication link and the controller, or damage to the optical receiving circuit of the controller in the ring fiber optic communication link. This information is provided for maintenance personnel to inspect and repair.

[0085] In one embodiment of this application, the step of responding to the power-on or normal communication process of the cascaded energy storage converter, and determining a communication failure and identifying the node where the communication link is interrupted based on the received power unit module address code when normal communication with the power unit module of the ring fiber optic communication link is not established, includes: if a communication failure occurs during the normal communication process of the cascaded energy storage converter, the analog controller of the power unit module after the communication interruption node sends the unit module address code 1 and fixed data to the next-level power unit module; the next-level power unit module receives the unit module address code 1 and fixed data sent by the previous-level power unit module and latches the unit module address code 1, and then sends the unit module address 2 and fixed data to the next-level power unit module; and so on, with power unit module m sending the power unit module address code k and fixed data to the controller; and the node where the communication link is interrupted is identified based on the received power unit module address code k.

[0086] like Figure 5 The diagram illustrates the principle of communication failure in the ring fiber optic communication link of a cascaded energy storage converter. After the cascaded energy storage converter is powered on, if a communication failure occurs when the power unit module of the ring fiber optic communication link fails to establish normal communication with the controller, or if a communication failure occurs during normal communication of the cascaded energy storage converter, the power unit module after the communication interruption node simulates the controller and sends unit module address code 1 and fixed data to the next-level power unit module. The next-level power unit module receives unit module address code 1 and fixed data from the previous-level power unit module and latches unit module address code 1, then sends unit module address 2 and fixed data to the next-level power unit module; and so on. Power unit module m sends... The controller receives the power unit module address code k and fixed data sent by the power unit module at the end of the ring fiber optic communication link. Based on the received power unit module address code k, the controller identifies the power unit module at the beginning of the ring fiber optic communication link as coded as m-k+1, and displays this power unit module as a communication interruption fault node. The communication interruption node indicates that the optical transmitting circuit of the control board of the power unit module coded as mk, the optical fiber between the power unit module coded as mk and the power unit module coded as m-k+1, or the optical receiving circuit of the power unit module coded as m-k+1 is damaged, so that operation and maintenance personnel can carry out inspection and maintenance.

[0087] This application embodiment also provides a communication interruption location device 600 for ring fiber optic communication of cascaded energy storage converters, such as... Figure 6The diagram provided illustrates the structure of a communication interruption location device for a cascaded energy storage converter ring fiber optic communication system in this embodiment of the application. The communication interruption location device 600 for the cascaded energy storage converter ring fiber optic communication system includes at least: a first module 610 and a second module 620, wherein:

[0088] In one embodiment of this application, the first module 610 is specifically used to: in response to the power-on or normal communication process of the cascaded energy storage converter, if normal communication is not established with the power unit module of the ring optical fiber communication link, determine that a communication failure has occurred and identify the node in the ring optical fiber communication link where communication has been interrupted based on the received power unit module address code.

[0089] One scenario is that after the cascaded energy storage converter is powered on, if the controller cannot receive the data sent by the power unit module at the end of the ring fiber optic communication link, the controller determines that the uplink communication of the ring fiber optic communication link is faulty.

[0090] Another scenario is that after the cascaded energy storage converter is powered on, if a communication failure occurs before the power unit module and controller of the ring fiber optic communication link are established, the power unit module after the communication interruption node simulates the controller and sends the unit module address code 1 and fixed data to the next stage power unit module. The next stage power unit module receives the unit module address code 1 and fixed data sent by the previous stage power unit module and latches the unit module address code 1. Then, it sends the unit module address 2 and fixed data to the next stage power unit module. And so on, the power unit module m sends the power unit module address code k and fixed data to the controller. The controller identifies the communication interruption node of the ring fiber optic communication link based on the received power unit module address code k.

[0091] In one embodiment of this application, the second module 620 is specifically used to: in response to the power-on or normal communication process of the cascaded energy storage converter, determine that an uplink communication failure has occurred in the ring fiber optic communication link if no data is received from the power unit module at the end of the ring fiber optic communication link.

[0092] One scenario is that during normal communication of a cascaded energy storage converter, if the controller cannot receive data sent by the power unit module at the end of the ring fiber optic communication link, the controller determines that the uplink communication of the ring fiber optic communication link is faulty.

[0093] Another scenario involves a communication failure occurring during normal communication of the cascaded energy storage converter. In this case, the power unit module analog controller after the communication interruption node sends unit module address code 1 and fixed data to the next-stage power unit module. The next-stage power unit module receives and latches the unit module address code 1 sent by the previous-stage power unit module, and then sends unit module address code 2 and fixed data to the next-stage power unit module. This process continues, with power unit module m sending power unit module address code k and fixed data to the controller. The controller identifies the communication interruption node in the ring fiber optic communication link based on the received power unit module address code k.

[0094] In one embodiment of this application, the second module 620 is further configured to:

[0095] If the cascaded energy storage converter does not receive data from the power unit module at the end of the ring fiber communication link after being powered on, the uplink communication failure and the corresponding communication interruption node of the ring fiber communication link shall be determined according to the ring fiber communication protocol.

[0096] At this time, the communication interruption node includes at least one of the following situations: the optical transmitting circuit of the control board of the power unit module at the end of the ring optical fiber communication link, the optical fiber between the power unit module at the end of the ring optical fiber communication link and the controller, or the optical receiving circuit of the controller of the ring optical fiber communication link is damaged.

[0097] In one embodiment of this application, the first module 610 is further configured to:

[0098] If the cascaded energy storage converter fails to establish normal communication with the power unit module of the ring optical fiber communication link after being powered on, it is considered to have a communication failure.

[0099] At this time, the communication interruption node includes at least one of the following situations: the optical transmitting circuit of the control board of the power unit module coded as mk, the optical fiber between the power unit body coded as mk and the power unit module coded as m-k+1 is damaged; the optical transmitting circuit of the control board of the power unit module coded as mk, the optical receiving loop between the power unit body coded as mk and the power unit module coded as m-k+1 is damaged.

[0100] In one embodiment of this application, the second module 620 is further configured to:

[0101] During normal communication of the cascaded energy storage converter, an uplink communication failure occurs. At this time, the communication interruption node includes at least one of the following: the optical transmitting circuit of the control board of the last power unit module of the ring optical fiber communication link is damaged; the optical fiber between the last power unit module of the ring optical fiber communication link and the controller is damaged; the optical transmitting circuit of the control board of the last power unit module of the ring optical fiber communication link is damaged; the optical receiving circuit between the last power unit module of the ring optical fiber communication link and the controller of the ring optical fiber communication link is damaged.

[0102] In one embodiment of this application, the first module 610 is further configured to:

[0103] During normal communication, the cascaded energy storage converter experiences a communication failure. Based on the received power unit module address code k, the power unit module located at the front end of the ring fiber optic communication link is identified as m-k+1, and this power unit module m-k+1 is displayed as a communication interruption fault node.

[0104] At this time, the communication interruption node includes at least one of the following situations: the optical transmitting circuit of the control board of the power unit module coded as mk, the optical fiber between the power unit body coded as mk and the power unit module coded as m-k+1 is damaged; the optical transmitting circuit of the control board of the power unit module coded as mk, the optical receiving loop between the power unit body coded as mk and the power unit module coded as m-k+1 is damaged.

[0105] In one embodiment of this application, it further includes: a third module, used for:

[0106] Arrange the communication optical fibers of the cascaded energy storage converter;

[0107] There are n ring-shaped optical fiber communication links between the controller and the power unit modules of the cascaded energy storage converter. Each ring-shaped optical fiber communication link contains m power unit modules, which are labeled as power unit module 1, power unit module 2, ..., power unit module m, respectively.

[0108] Taking the first ring-shaped optical fiber communication link as an example, the optical transmitter TX_1 of the controller of the cascaded energy storage converter is connected to the optical receiver RX of the power unit module 1 via optical fiber, and the optical transmitter TX of the power unit module 1 is connected to the optical receiver RX of the power unit module 2 via optical fiber.

[0109] Similarly, the optical transmitter TX of the power unit module m is connected to the optical receiver RX_1 of the controller of the energy storage converter via optical fiber; similarly, the second ring optical fiber communication link, ..., the nth ring optical fiber communication link adopt the same optical fiber connection method.

[0110] In one embodiment of this application, it further includes: a fourth module, used for

[0111] The power unit module address code of the cascaded energy storage converter ring optical fiber communication link is automatically allocated and transmitted. After the communication optical fiber of the cascaded energy storage converter is arranged and powered on, the power unit module address code 1 and the control data of all unit modules of the ring optical fiber communication link are sent to the power unit module 1 of the ring optical fiber communication link.

[0112] Power unit module 1 receives power unit module address code 1 and control data of all unit modules in the ring optical fiber communication link sent by the controller. It first latches power unit module address code 1 and then transmits data to the next level power unit module. The data includes the address 2 of the next level power unit module.

[0113] Similarly, power unit module m first latches the power unit module address code m and then transmits the data, which includes the power unit module address code m+1.

[0114] In one embodiment of this application, the first module 610 is further configured to;

[0115] After the cascaded energy storage converter is powered on, if a communication failure occurs when the power unit module of the ring optical fiber communication link fails to establish normal communication with the controller, the power unit module after the communication interruption node simulates the controller to send the unit module address code 1 and fixed data to the next stage power unit module. The next stage power unit module receives the unit module address code 1 and fixed data sent by the previous stage power unit module and latches the unit module address code 1. Then, it sends the unit module address 2 and fixed data to the next stage power unit module.

[0116] Similarly, the power unit module m sends the power unit module address code k and fixed data to the controller;

[0117] The node where communication was interrupted in the ring fiber optic communication link was identified based on the received power unit module address code k.

[0118] In one embodiment of this application, the first module 610 is further configured to:

[0119] If a communication failure occurs during normal communication of the cascaded energy storage converter, the analog controller of the power unit module after the communication interruption node sends the unit module address code 1 and fixed data to the next stage power unit module. The next stage power unit module receives the unit module address code 1 and fixed data sent by the previous stage power unit module and latches the unit module address code 1. Then, it sends the unit module address 2 and fixed data to the next stage power unit module.

[0120] Similarly, power unit module m sends power unit module address code k and fixed data to the controller;

[0121] The node where communication was interrupted in the ring fiber optic communication link was identified based on the received power unit module address code k.

[0122] It is understood that the communication interruption location device for the cascaded energy storage converter ring fiber optic communication described above can realize each step of the communication interruption location method for the cascaded energy storage converter ring fiber optic communication provided in the foregoing embodiments. The relevant explanations of the communication interruption location method for the cascaded energy storage converter ring fiber optic communication are all applicable to the communication interruption location device for the cascaded energy storage converter ring fiber optic communication, and will not be repeated here.

[0123] Figure 7 This is a schematic diagram of the structure of an electronic device according to an embodiment of this application. Please refer to it. Figure 7 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.

[0124] 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 7 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.

[0125] 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.

[0126] The processor reads the corresponding computer program from non-volatile memory into main memory and then executes it, forming a communication interruption location device for the cascaded energy storage converter's ring fiber optic communication at the logical level. The processor executes the program stored in memory and specifically performs the following operations:

[0127] In response to the power-on or normal communication process of the cascaded energy storage converter, if normal communication is not established with the power unit module of the ring fiber optic communication link, a communication fault is determined, and the node where the communication interruption occurred in the ring fiber optic communication link is identified based on the received power unit module address code; and

[0128] In response to the power-on or normal communication process of the cascaded energy storage converter, if no data is received from the power unit module at the end of the ring fiber optic communication link, it is determined that an uplink communication failure has occurred in the ring fiber optic communication link.

[0129] The above is as stated in this application. Figure 2 The method executed by the communication interruption location device for the cascaded energy storage converter ring fiber optic communication 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. In 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 embodied as being executed by a hardware decoding processor, or executed 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.

[0130] The electronic device can also perform Figure 2 A method for implementing a communication interruption location device in a cascaded energy storage converter's ring fiber optic communication, and the implementation of such a device in... Figure 2The functions of the embodiments shown are not described again in this application.

[0131] 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 2 The method executed by the communication interruption location device in the ring fiber optic communication of the cascaded energy storage converter in the illustrated embodiment is specifically used to perform the following:

[0132] In response to the power-on or normal communication process of the cascaded energy storage converter, if normal communication is not established with the power unit module of the ring fiber optic communication link, a communication fault is determined, and the node where the communication interruption occurred in the ring fiber optic communication link is identified based on the received power unit module address code; and

[0133] In response to the power-on or normal communication process of the cascaded energy storage converter, if no data is received from the power unit module at the end of the ring fiber optic communication link, it is determined that an uplink communication failure has occurred in the ring fiber optic communication link.

[0134] 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.

[0135] 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.

[0136] 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.

[0137] These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable apparatus 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.

[0138] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0139] 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.

[0140] 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.

[0141] 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.

[0142] 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.

[0143] 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 locating communication interruptions in a ring-type optical fiber communication system for a cascaded energy storage converter, wherein, A controller applied to a cascaded energy storage converter, wherein each ring fiber optic communication link contains m power unit modules, and the communication interruption location method includes: In response to the power-on or normal communication process of the cascaded energy storage converter, if normal communication is not established with the power unit module of the ring fiber optic communication link, a communication fault is determined, and the node where the communication interruption occurred in the ring fiber optic communication link is identified based on the received power unit module address code; and In response to the power-on or normal communication process of the cascaded energy storage converter, if no data is received from the power unit module at the end of the ring fiber communication link, it is determined that an uplink communication failure has occurred in the ring fiber communication link, and the failure is determined to occur in the communication link between the power unit module at the end and the controller of the ring fiber communication link. The method of responding to the power-on or normal communication process of the cascaded energy storage converter, in the case that normal communication has not been established with the power unit module of the ring optical fiber communication link, determines that a communication failure has occurred and identifies the node in the ring optical fiber communication link where communication has been interrupted based on the received power unit module address code, including: After the cascaded energy storage converter is powered on, if a communication failure occurs when the power unit module of the ring optical fiber communication link fails to establish normal communication with the controller, or if a communication failure occurs during normal communication of the cascaded energy storage converter, the power unit module after the communication interruption node simulates the controller to send the unit module address code 1 and fixed data to the next stage power unit module. The next stage power unit module receives the unit module address code 1 and fixed data sent by the previous stage power unit module and latches the unit module address code 1. Then, it sends the unit module address 2 and fixed data to the next stage power unit module. Similarly, power unit module m sends power unit module address code k and fixed data to the controller; based on the received power unit module address code k, the node where the communication link of the ring fiber optic communication link has been interrupted is identified, and it is determined that the fault occurred on the communication link between the power unit module coded as m-k+1 and the power unit module m-k+1.

2. The method as described in claim 1, wherein, In response to the power-on or normal communication process of the cascaded energy storage converter, if no data is received from the power unit module at the end of the ring fiber optic communication link, an uplink communication failure is determined to have occurred in the ring fiber optic communication link, including: If the cascaded energy storage converter does not receive data from the power unit module at the end of the ring fiber communication link after being powered on, the uplink communication failure and the corresponding communication interruption node of the ring fiber communication link shall be determined according to the ring fiber communication protocol. At this time, the communication interruption node includes at least one of the following situations: the optical transmitting circuit of the control board of the power unit module at the end of the ring optical fiber communication link, the optical fiber between the power unit module at the end of the ring optical fiber communication link and the controller, or the optical receiving circuit of the controller of the ring optical fiber communication link is damaged.

3. The method as described in claim 2, wherein, The response to the power-on or normal communication process of the cascaded energy storage converter, in the event that normal communication has not been established with the power unit module of the ring fiber optic communication link, determines that a communication failure has occurred and identifies the node where the ring fiber optic communication link has been interrupted based on the received power unit module address code, including: If the cascaded energy storage converter fails to establish normal communication with the power unit module of the ring optical fiber communication link after being powered on, it is considered that a communication failure has occurred. At this time, the communication interruption node includes at least one of the following situations: the optical transmitting circuit of the control board of the power unit module coded as mk is damaged; the optical fiber between the power unit module coded as mk and the power unit module coded as m-k+1 is damaged; or the optical receiving loop of the power unit module coded as m-k+1 is damaged.

4. The method as described in claim 2, wherein, In response to the power-on or normal communication process of the cascaded energy storage converter, if no data is received from the power unit module at the end of the ring fiber optic communication link, an uplink communication failure is determined to have occurred in the ring fiber optic communication link, including: If an uplink communication failure occurs during normal communication of the cascaded energy storage converter, the communication interruption node includes at least one of the following: the optical transmitting circuit of the control board of the power unit module at the end of the ring optical fiber communication link; the optical fiber between the power unit module at the end of the ring optical fiber communication link and the controller is damaged; or the optical receiving circuit of the controller of the ring optical fiber communication link is damaged.

5. The method as described in claim 2, wherein, The response to the power-on or normal communication process of the cascaded energy storage converter, in the event that normal communication has not been established with the power unit module of the ring fiber optic communication link, determines that a communication failure has occurred and identifies the node where the ring fiber optic communication link has been interrupted based on the received power unit module address code, including: During normal communication, the cascaded energy storage converter experiences a communication failure. Based on the received power unit module address code k, the power unit module located at the front end of the ring fiber optic communication link is identified as m-k+1, and this power unit module m-k+1 is displayed as a communication interruption fault node. At this time, the communication interruption node includes at least one of the following situations: the optical transmitting circuit of the control board of the power unit module coded as mk is damaged; the optical fiber between the power unit module coded as mk and the power unit module coded as m-k+1 is damaged; or the optical receiving loop of the power unit module coded as m-k+1 is damaged.

6. The method of claim 1, wherein, The response prior to the power-on or normal communication process of the cascaded energy storage converter also includes: Arrange the communication optical fibers of the cascaded energy storage converter; There are n ring-shaped optical fiber communication links between the controller and the power unit modules of the cascaded energy storage converter. Each ring-shaped optical fiber communication link contains m power unit modules, which are labeled as power unit module 1, power unit module 2, ..., power unit module m, respectively. Taking the first ring-shaped optical fiber communication link as an example, the optical transmitter TX_1 of the controller of the cascaded energy storage converter is connected to the optical receiver RX of the power unit module 1 via optical fiber, and the optical transmitter TX of the power unit module 1 is connected to the optical receiver RX of the power unit module 2 via optical fiber. Similarly, the optical transmitter TX of the power unit module m is connected to the optical receiver RX_1 of the controller of the energy storage converter via optical fiber; similarly, the second ring optical fiber communication link, ..., the nth ring optical fiber communication link adopt the same optical fiber connection method.

7. The method of claim 6, further comprising: The power unit module address code of the cascaded energy storage converter ring optical fiber communication link is automatically allocated and transmitted. After the communication optical fiber of the cascaded energy storage converter is arranged and powered on, the power unit module address code 1 and the control data of all unit modules of the ring optical fiber communication link are sent to the power unit module 1 of the ring optical fiber communication link. Power unit module 1 receives power unit module address code 1 and control data of all unit modules in the ring optical fiber communication link sent by the controller. It first latches power unit module address code 1 and then transmits data to the next level power unit module. The data includes the address 2 of the next level power unit module. Similarly, power unit module m first latches the power unit module address code m and then transmits the data, which includes the power unit module address code m+1.

8. A communication interruption location device for a cascaded energy storage converter with ring optical fiber communication, wherein, A controller applied to a cascaded energy storage converter, wherein each ring-shaped optical fiber communication link contains m power unit modules, and the communication interruption location device includes: The first module, in response to the power-on or normal communication process of the cascaded energy storage converter, determines a communication failure and identifies the node in the ring fiber optic communication link where communication has been interrupted based on the received power unit module address code when normal communication with the power unit module in the ring fiber optic communication link has not been established; and The second module is used to respond to the power-on or normal communication process of the cascaded energy storage converter. If no data is received from the power unit module at the end of the ring fiber communication link, it is determined that an uplink communication failure has occurred in the ring fiber communication link. The failure is determined to occur in the communication link between the power unit module at the end and the controller of the ring fiber communication link. The method of responding to the power-on or normal communication process of the cascaded energy storage converter, in the case that normal communication has not been established with the power unit module of the ring optical fiber communication link, determines that a communication failure has occurred and identifies the node in the ring optical fiber communication link where communication has been interrupted based on the received power unit module address code, including: After the cascaded energy storage converter is powered on, if a communication failure occurs when the power unit module of the ring optical fiber communication link fails to establish normal communication with the controller, or if a communication failure occurs during normal communication of the cascaded energy storage converter, the power unit module after the communication interruption node simulates the controller to send the unit module address code 1 and fixed data to the next stage power unit module. The next stage power unit module receives the unit module address code 1 and fixed data sent by the previous stage power unit module and latches the unit module address code 1. Then, it sends the unit module address 2 and fixed data to the next stage power unit module. Similarly, power unit module m sends power unit module address code k and fixed data to the controller; based on the received power unit module address code k, the node where the communication link of the ring fiber optic communication link has been interrupted is identified, and it is determined that the fault occurred on the communication link between the power unit module coded as m-k+1 and the power unit module m-k+1.

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