Protection method and system for flexible direct-current micro-grid electrolytic aluminum system

Abstract

The invention provides a protection method and system for a flexible direct-current micro-grid electrolytic aluminum system. The method comprises the steps that historical fault information of the flexible direct-current micro-grid electrolytic aluminum system and electrolytic aluminum bus protection cabinet line information are acquired; performing traceability analysis on the historical fault information to obtain fault traceability information; according to the fault traceability information and the electrolytic aluminum bus protection cabinet line information, carrying out protection area segmentation on the electrolytic aluminum bus protection cabinet line to obtain a plurality of protection areas; performing protection line optimization on each protection area according to the fault traceability information to generate a corresponding protection line; obtaining protection cabinet line connection optimization information according to all protection lines; and carrying out line protection on the flexible DC micro-grid electrolytic aluminum system according to the protection cabinet line connection optimization information. According to the method disclosed by the invention, the protection effect on the flexible direct-current micro-grid electrolytic aluminum system can be improved.

Description

Technical Field

[0001] The present disclosure belongs to the field of data processing technology, and in particular relates to a protection method and system for a flexible direct current microgrid aluminum electrolysis system. Background Art

[0002] Aluminum is widely used in many fields such as construction, real estate, transportation, etc., and is known as a "high-energy-consuming industry". Distributed photovoltaic power generation systems have small installed capacity and flexible forms. Applying them to the power supply of high-energy-consuming electrolytic aluminum to form a flexible DC microgrid electrolytic aluminum system can effectively promote the high-quality development of energy conservation and carbon reduction in the aluminum industry, and help accelerate the adjustment and upgrading of the renewable energy structure and the promotion of the "dual carbon" goal.

[0003] However, from the perspective of electrical analysis, the current protection of flexible DC microgrid aluminum electrolytic systems still has technical problems such as inaccurate protection line settings, resulting in poor protection effects. Summary of the invention

[0004] The present disclosure aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the present disclosure provides a protection method and system for a flexible DC microgrid aluminum electrolysis system, the main purpose of which is to solve the technical problem in the prior art that the protection effect is poor due to inaccurate protection line setting.

[0005] According to a first aspect of the present disclosure, there is provided a protection method for a flexible DC microgrid aluminum electrolysis system, comprising:

[0006] Obtain historical fault information of the flexible DC microgrid aluminum electrolysis system and line information of the aluminum electrolysis busbar protection cabinet;

[0007] Performing source tracing analysis on the historical fault information to obtain fault source tracing information;

[0008] According to the fault tracing information and the line information of the electrolytic aluminum busbar protection cabinet, the protection area of ​​the electrolytic aluminum busbar protection cabinet line is divided to obtain multiple protection areas;

[0009] Optimize the protection lines of each protection area according to the fault tracing information to generate corresponding protection lines;

[0010] Obtain protection cabinet line connection optimization information based on all protection lines;

[0011] The flexible DC microgrid aluminum electrolysis system is protected by lines according to the protection cabinet line connection optimization information.

[0012] In one embodiment of the present disclosure, the tracing analysis of the historical fault information to obtain the fault tracing information includes: combining the principle of line operation, using the historical fault information to obtain the fault cause, fault type and fault location; obtaining the fault tracing information based on the fault cause, the fault type and the fault location.

[0013] In one embodiment of the present disclosure, the protection area division of the electrolytic aluminum busbar protection cabinet line according to the fault tracing information and the electrolytic aluminum busbar protection cabinet line information includes: classifying the faults according to the similarity of the fault tracing information, combining the electrolytic aluminum busbar protection cabinet line information to determine the line range where each fault type occurs in the busbar protection cabinet line; dividing the line range radiated by each fault type into different protection areas.

[0014] In one embodiment of the present disclosure, cluster analysis is used when classifying faults according to the similarity of the fault tracing information.

[0015] In one embodiment of the present disclosure, the protection line optimization of each protection area according to the fault tracing information generates a corresponding protection line, including: eliminating the fault by replacing components or changing the line connection method according to the fault cause and fault type in each protection area; and obtaining the corresponding protection line based on the information of the replaced components or the changed line connection method.

[0016] According to a second aspect of the present disclosure, a protection system for a flexible DC microgrid aluminum electrolysis system is provided, comprising:

[0017] An information acquisition module is used to obtain historical fault information of the flexible DC microgrid aluminum electrolysis system and line information of the aluminum electrolysis busbar protection cabinet;

[0018] A source tracing analysis module is used to perform source tracing analysis on the historical fault information to obtain fault tracing information;

[0019] A protection area segmentation module is used to segment the protection area of ​​the electrolytic aluminum busbar protection cabinet line according to the fault tracing information and the electrolytic aluminum busbar protection cabinet line information to obtain multiple protection areas;

[0020] A line optimization generation module, used to optimize the protection line of each protection area according to the fault tracing information to generate a corresponding protection line;

[0021] An optimization information acquisition module is used to obtain protection cabinet line connection optimization information based on all protection lines;

[0022] The line protection module is used to perform line protection on the flexible DC microgrid aluminum electrolysis system according to the line connection optimization information of the protection cabinet.

[0023] In one embodiment of the present disclosure, the tracing analysis module is specifically used to: combine the principle of line operation and use the historical fault information to obtain the fault cause, fault type and fault location; obtain the fault tracing information based on the fault cause, the fault type and the fault location.

[0024] In one embodiment of the present disclosure, the protection area segmentation module is specifically used to: classify the faults according to the similarity of the fault tracing information, combine the line information of the electrolytic aluminum busbar protection cabinet to determine the line range where each fault type occurs in the busbar protection cabinet line; divide the line range radiated by each fault type into different protection areas.

[0025] In one embodiment of the present disclosure, the line optimization generation module is specifically used to: eliminate the faults by replacing components or changing the line connection method according to the fault causes and fault types in each protection area; and obtain the corresponding protection line based on the information of the replaced components or the changed line connection method.

[0026] According to an embodiment of the third aspect of the present disclosure, a protection device for a flexible DC microgrid aluminum electrolysis system is also provided, comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the protection method for a flexible DC microgrid aluminum electrolysis system proposed in the embodiment of the first aspect of the present disclosure.

[0027] In one or more embodiments of the present disclosure, historical fault information and line information of the electrolytic aluminum busbar protection cabinet of the flexible DC microgrid electrolytic aluminum system are obtained; the historical fault information is traced and analyzed to obtain fault tracing information; the electrolytic aluminum busbar protection cabinet line is divided into protection areas according to the fault tracing information and the line information of the electrolytic aluminum busbar protection cabinet to obtain multiple protection areas; the protection line of each protection area is optimized according to the fault tracing information to generate corresponding protection lines; the protection cabinet line connection optimization information is obtained according to all protection lines; and the flexible DC microgrid electrolytic aluminum system is protected according to the protection cabinet line connection optimization information. In this case, after obtaining historical fault information and the line information of the electrolytic aluminum busbar protection cabinet, analyzing and obtaining the fault tracing information, the electrolytic aluminum busbar protection cabinet line is divided into multiple protection areas, the protection line of the multiple areas is optimized to generate corresponding protection lines, and finally the flexible DC microgrid electrolytic aluminum system is protected by all protection lines, which solves the technical problem of poor protection effect caused by inaccurate protection line setting in the prior art, realizes optimization of protection lines, and improves the protection effect of the flexible DC microgrid electrolytic aluminum system.

[0028] Additional aspects and advantages of the present disclosure will be given in part in the following description and in part will be obvious from the following description or learned through practice of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and / or additional aspects and advantages of the present disclosure will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0030] Figure 1 A flow chart of a protection method for a flexible DC microgrid aluminum electrolysis system provided by an embodiment of the present disclosure is shown;

[0031] Figure 2 A schematic diagram of a process for dividing the protection area of ​​an aluminum electrolytic busbar protection cabinet line in a protection method for a flexible DC microgrid aluminum electrolytic system provided by an embodiment of the present disclosure is shown;

[0032] Figure 3 A schematic diagram of a process for generating a first protection circuit in a protection method for a flexible DC microgrid aluminum electrolysis system provided by an embodiment of the present disclosure is shown;

[0033] Figure 4 A block diagram of a protection system for a flexible DC microgrid aluminum electrolysis system provided by an embodiment of the present disclosure is shown;

[0034] Figure 5 It is a block diagram of a protection device for a flexible DC microgrid aluminum electrolysis system used to implement the protection method for a flexible DC microgrid aluminum electrolysis system in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0035] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the embodiments of the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the embodiments of the present disclosure as detailed in the appended claims.

[0036] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present disclosure, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. It should also be understood that the term "and / or" used in the present disclosure refers to and includes any or all possible combinations of one or more associated listed items.

[0038] Embodiments of the present disclosure are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present disclosure, and should not be construed as limiting the present disclosure.

[0039] The present disclosure provides a protection method and system for a flexible DC microgrid aluminum electrolysis system, the main purpose of which is to solve the technical problem in the prior art that the protection effect is poor due to inaccurate protection line setting.

[0040] In the present disclosure, the flexible DC microgrid aluminum electrolytic system refers to an aluminum electrolytic system that uses a stable flexible medium-voltage DC microgrid technology to power aluminum electrolytic cells. That is, distributed photovoltaic DC is connected to the aluminum electrolytic DC busbar, and photovoltaic power generation directly supplies power to the electrolytic cells, thereby realizing the interconnection of the electrolytic cells and photovoltaic DC power supply. Large-capacity distributed photovoltaic DC microgrid power is directly supplied to the aluminum electrolytic system.

[0041] In a first embodiment, Figure 1 A schematic diagram of a protection method for a flexible DC microgrid aluminum electrolysis system provided by an embodiment of the present disclosure is shown. Figure 1 As shown, the protection method for the flexible DC microgrid aluminum electrolysis system includes:

[0042] Step S100, obtaining historical fault information of the flexible DC microgrid aluminum electrolysis system and line information of the aluminum electrolysis busbar protection cabinet.

[0043] In step S100, historical fault information refers to information on all faults that occurred in the flexible DC microgrid aluminum electrolysis system in the past period of time (e.g., the past month, half a year, etc., which can be adaptively adjusted according to actual needs), including but not limited to short circuits, arcing, etc. The purpose of obtaining historical fault information is to troubleshoot all problems that have occurred, so as to facilitate subsequent solutions to the problems.

[0044] In step S100, the circuit information of the electrolytic aluminum busbar protection cabinet refers to the connection mode between the devices and components inside the cabinet, and the operation mode between the modules. Obtaining the circuit information of the electrolytic aluminum busbar protection cabinet can be used as the basic information for subsequent analysis.

[0045] Step S200, performing source tracing analysis on historical fault information to obtain fault tracing information.

[0046] In step S200, historical fault information is traced and analyzed to obtain fault tracing information, including: combining the principle of line operation, using historical fault information to obtain the fault cause, fault type and fault location; obtaining fault tracing information based on the fault cause, fault type and fault location.

[0047] Specifically, the historical fault information is traced back and analyzed, that is, the cause of the fault (i.e., the cause of the fault), type (i.e., the type of fault) and location (i.e., the location of the fault) are deduced from the result of the line fault (e.g., short circuit, arcing, etc.) combined with the principle of line operation. For example, in the case of a short circuit in the line in the historical fault information, the mismatched equipment or components, or the unreasonable connection of the line are found based on the location of the short circuit and the line operation principle at that location, and the mismatched equipment or components, or the unreasonable connection of the line are used as the fault tracing information. The fault tracing information can be used as the basis for subsequent line optimization.

[0048] Step S300, dividing the protection area of ​​the aluminum electrolytic busbar protection cabinet line according to the fault tracing information and the aluminum electrolytic busbar protection cabinet line information to obtain multiple protection areas.

[0049] In step S300, considering that the cause of the fault, the type of fault and the location of the fault can be determined according to the fault tracing information, the protection area of ​​the electrolytic aluminum busbar protection cabinet line is divided according to the fault tracing information and the line information of the electrolytic aluminum busbar protection cabinet, including: classifying the faults according to the similarity of the fault tracing information, combining the line information of the electrolytic aluminum busbar protection cabinet to determine the line range where each type of fault occurs in the busbar protection cabinet line; dividing the line range radiated by each type of fault into different protection areas. Cluster analysis is used when classifying the faults according to the similarity of the fault tracing information. Multiple protection areas include, for example, a first protection area, a second protection area, and a third protection area. That is, the electrolytic aluminum busbar protection cabinet line is divided into a first protection area, a second protection area, and a third protection area, and dividing the protection areas is conducive to taking targeted protection measures.

[0050] Take three protected areas as an example. Figure 2 A schematic diagram of a process for dividing the protection area of ​​an aluminum electrolytic busbar protection cabinet line in a protection method for a flexible DC microgrid aluminum electrolytic system provided by an embodiment of the present disclosure is shown.

[0051] like Figure 2 As shown, the protection area segmentation step includes: performing cluster analysis on the fault tracing information to obtain multiple types of fault cause information (step S310); matching the fault line according to the multiple types of fault cause information and the electrolytic aluminum busbar protection cabinet line information to obtain the fault line matching result (step S320); and segmenting the electrolytic aluminum busbar protection cabinet line into protection areas according to the fault line matching result to obtain the first protection area, the second protection area, and the third protection area (step S330).

[0052] Specifically, the faults are classified according to the similarity of the fault tracing information, and the faults caused by the same reason are classified into one category. Different types of fault causes are obtained and sorted into a collection, which is the multi-type fault cause information; the cause of the fault is matched with the line information of the protection cabinet one by one, and the line range where each type of fault occurs in the bus protection cabinet line is found. The electrolytic aluminum bus protection cabinet line is divided into protection areas according to the line range radiated by each fault type, and the first protection area, the second protection area, and the third protection area are obtained. On the one hand, the most appropriate protection measures can be taken for problems in different areas, and on the other hand, it can play a role in multiple protection.

[0053] Step S400: Optimize the protection lines of each protection area according to the fault tracing information to generate corresponding protection lines.

[0054] In step S400, the protection lines of each protection area are optimized according to the fault tracing information to generate corresponding protection lines, including: eliminating the faults by replacing components or changing the line connection method according to the causes and types of faults in each protection area; and obtaining corresponding protection lines based on the information of replaced components or changed line connection methods.

[0055] In step S400, when the multiple protection areas include the first protection area, the second protection area, and the third protection area, the corresponding protection lines are the first protection line, the second protection line, and the third protection line. That is, according to the fault tracing information, the first protection area, the second protection area, and the third protection area are optimized to generate the first protection line, the second protection line, and the third protection line.

[0056] Specifically, the cause and type of fault in each protection area can be determined by the fault tracing information. Therefore, the cause and type of fault in the first protection area, the second protection area, and the third protection area can be eliminated by replacing components or changing the line connection method, so as to optimize each protection line and generate the optimized first protection line, second protection line, and third protection line, thereby improving the protection effect of various parts of the flexible DC microgrid aluminum electrolytic system.

[0057] Take the blocking diode and the first protection circuit as an example. Figure 3 A schematic diagram of a process for generating a first protection circuit in a protection method for a flexible DC microgrid aluminum electrolysis system provided in an embodiment of the present disclosure is shown.

[0058] like Figure 3 As shown, the process of generating the first protection line includes: analyzing the protection effect of the checking diode according to the fault tracing information, and generating the checking diode protection evaluation information (step S411); optimizing the checking diode according to the checking diode protection evaluation information, and generating the checking diode optimization information, wherein the checking diode optimization information includes the checking diode model information and quantity information (step S412); constructing a diode absorption loop according to the checking diode model information and quantity information as the first protection line, adding the first protection line to the protection cabinet line connection optimization information, and performing line protection on the flexible DC microgrid electrolytic aluminum system (step S413).

[0059] Specifically, the protection principle of the checking diode is that when the busbar of the electrolytic aluminum bridge is short-circuited, the checking diode needs to change from the on state to the off state, so as to achieve the protection effect of cutting off the short circuit and protecting the power supply; the damage of each device in the fault tracing information can be used to determine whether the checking diode has achieved the above protection effect, and the protection effect of the currently used model of the checking diode is the protection evaluation information of the checking diode; the gap between the current protection effect and the ideal protection effect is determined according to the checking diode protection evaluation information, and the gap is used for calculation, and the model information and quantity information of the checking diode that meet the requirements are determined by the calculation results; the diode absorption circuit is constructed by the optimized checking diode model information and quantity information to absorb part of the hard input energy to avoid instantaneous strong current breakdown of components such as switches, and this is used as the first protection line. The first protection line is added to the protection cabinet line connection optimization information, which can improve the protection effect of the first protection area of ​​the flexible DC microgrid electrolytic aluminum system.

[0060] Taking the fuse and generating the second protection circuit as an example, the process of generating the second protection circuit includes: analyzing the current breaking effect of the fuse according to the fault tracing information, and generating fuse evaluation information (step S421); optimizing the fuse according to the fuse evaluation information, and generating fuse optimization information, the fuse optimization information including the fuse model, quantity and connection method information (step S422); adding the fuse model, quantity and connection method information as the second protection circuit to the protection cabinet line connection optimization information for line protection (step S423).

[0061] Specifically, in the present disclosure, when a short-circuit protection occurs in the aluminum busbar of the bridge, if the above-mentioned check diode fails to be effectively cut off and causes the short circuit to pass through, the fuse needs to be blown to cut off the short-circuit loop. The fault tracing information can be used to determine whether the fuse has the effect of cutting off the short-circuit loop under current intensities within different ranges. The cutting effect is combined with the model of the currently used fuse and the current size at the time of the fault as fuse evaluation information; the gap between the current protection effect and the ideal protection effect is determined based on the fuse evaluation information, and the gap is used for calculation, and the fuse model, quantity and connection method information that meet the requirements are determined based on the calculation results; the fuse model, quantity and connection method information are added as the second protection line to the protection cabinet line connection optimization information, which can improve the protection effect of the second protection area of ​​the flexible DC microgrid electrolytic aluminum system.

[0062] Taking the isolating switch and generating the third protection line as an example, the process of generating the third protection line includes: analyzing the switch design parameters and the maximum load-breaking voltage parameters of the isolating switch according to the fault tracing information (step S431); evaluating the voltage breaking effect of the isolating switch through the switch design parameters and the maximum load-breaking voltage parameters to obtain the isolating switch evaluation information (step S432); optimizing the isolating switch according to the isolating switch evaluation information to obtain the isolating switch optimization information (step S433); generating the third protection line according to the isolating switch optimization information and adding it to the protection cabinet line connection optimization information for line protection (step S434).

[0063] Specifically, an isolating switch is a switching device that is mainly used for isolating power supply, switching operation, connecting and disconnecting small current circuits, and has no arc extinguishing function. Its design parameters include rated voltage, maximum operating voltage, rated current, etc. The rated voltage, maximum operating voltage, rated current, etc. of the isolating switch can be extracted from the fault tracing information, and the maximum voltage that the isolating switch can withstand when disconnecting the circuit with load and without causing an operating arc, that is, the maximum load-breaking voltage parameter of the isolating switch, can be calculated; by comparing the maximum load-breaking voltage parameters that can be borne by isolating switches with different design parameters, the numerical upper limits of the effective disconnecting voltage of the isolating switches with each parameter can be obtained respectively, and then the relationship between the design parameters and the voltage is calculated, which is used as the evaluation information of the isolating switch; the isolating switch evaluation information is combined with the maximum voltage that the system needs to disconnect to calculate the isolating switch parameters required by the system, and the switch model that can disconnect the circuit with load and without causing an operating arc is selected according to the parameters; the optimized isolating switch is used as the third protection line and added to the protection cabinet line, which can improve the protection effect of the third protection area of ​​the flexible DC microgrid electrolytic aluminum system.

[0064] Step S500: obtaining protection cabinet line connection optimization information according to all protection lines.

[0065] In step S500, the first protection circuit, the second protection circuit and the third protection circuit are replaced with components of appropriate models and connection methods, and each protection circuit is controlled to be connected to the electrolytic aluminum busbar protection cabinet circuit to obtain optimized protection cabinet circuit information (i.e., protection cabinet circuit connection optimization information).

[0066] Step S600: performing line protection on the flexible DC microgrid aluminum electrolysis system according to the protection cabinet line connection optimization information.

[0067] In step S600, the line connection optimization information of the protection cabinet is used to control the use of the optimized protection line to perform line protection on each area of ​​the flexible DC microgrid aluminum electrolysis system, so as to improve the protection effect of the flexible DC microgrid aluminum electrolysis system.

[0068] In the disclosed embodiment, the protection method for the flexible DC microgrid electrolytic aluminum system also includes: collecting and obtaining the electrolytic aluminum busbar ripple voltage parameter (step S710); determining whether the electrolytic aluminum busbar ripple voltage parameter is greater than the busbar ripple voltage parameter threshold (step S720); if greater, adding an EMI filter device to the electrolytic aluminum busbar protection cabinet line, and filtering out electromagnetic interference through the EMI filter device (step S730).

[0069] Specifically, ripple voltage refers to the industrial frequency AC component contained in the output DC voltage, which is easy to generate harmful harmonics in the equipment, causing electromagnetic interference, etc. Therefore, when the ripple voltage value exceeds the threshold that the equipment can withstand, a certain method needs to be used for processing. Collect and obtain the current ripple voltage parameter value of the electrolytic aluminum busbar equipment, and determine whether the ripple voltage parameter of the electrolytic aluminum busbar is greater than the current busbar ripple voltage parameter threshold. If greater than, it means that the ripple voltage value in the current equipment is greater than the tolerance range of the equipment, which will cause harm and interference to the equipment. Therefore, it is necessary to add an EMI (Electromagnetic Interference) filter device to the electrolytic aluminum busbar protection cabinet line. EMI filter, also known as electromagnetic interference filter, is an electronic circuit device used to suppress electromagnetic interference, especially noise in power lines or control signal lines. By installing an EMI filter device, electromagnetic interference can be effectively filtered out to protect the electrolytic aluminum busbar equipment.

[0070] In an embodiment of the present disclosure, the protection method for a flexible DC microgrid electrolytic aluminum system also includes: adding a residual current detection device in the electrolytic aluminum busbar protection cabinet line, and determining whether a ground short circuit fault occurs according to the residual current detection device (step S810); if so, generating a stop power generation instruction, controlling the DC microgrid to stop power generation according to the stop power generation instruction, and generating fault warning information (step S820); and performing fault detection on the electrolytic aluminum busbar protection cabinet line according to the fault warning information (step S830).

[0071] Specifically, in order to prevent multiple short circuits to the ground on the bridge busbar, a residual current detection device is added to the electrolytic aluminum busbar protection cabinet line. The residual current detection device is a device used to detect the residual current in the line. When the device detects that the residual current reaches or exceeds a predetermined value, it indicates that a ground short circuit fault has occurred in the line, and a stop power generation instruction can be generated. According to the stop power generation instruction, the DC microgrid is controlled to stop power generation, and fault warning information is generated. According to the fault warning information, the electrolytic aluminum busbar protection cabinet line is fault detected and the fault is repaired to ensure the normal operation of the equipment.

[0072] In the protection method for the flexible DC microgrid aluminum electrolysis system of the embodiment of the present disclosure, the historical fault information and the line information of the aluminum electrolysis bus protection cabinet of the flexible DC microgrid aluminum electrolysis system are obtained; the historical fault information is traced and analyzed to obtain the fault tracing information; the aluminum electrolysis bus protection cabinet line is divided into protection areas according to the fault tracing information and the aluminum electrolysis bus protection cabinet line information to obtain multiple protection areas; the protection line of each protection area is optimized to generate a corresponding protection line according to the fault tracing information; the protection cabinet line connection optimization information is obtained according to all the protection lines; and the flexible DC microgrid aluminum electrolysis system is protected according to the protection cabinet line connection optimization information. In this case, after obtaining the historical fault information and the aluminum electrolysis bus protection cabinet line information, analyzing and obtaining the fault tracing information, the aluminum electrolysis bus protection cabinet line is divided into multiple protection areas, the protection line of the multiple areas is optimized to generate corresponding protection lines, and finally the flexible DC microgrid aluminum electrolysis system is protected by all the protection lines, which solves the technical problem of poor protection effect caused by inaccurate protection line setting in the prior art, realizes the optimization of protection lines, and improves the protection effect of the flexible DC microgrid aluminum electrolysis system.

[0073] Taking three protection areas as an example, the protection method disclosed in the present invention obtains historical fault information and line information of the electrolytic aluminum busbar protection cabinet by connecting to the flexible DC microgrid electrolytic aluminum system, and then traces the historical fault information to obtain the fault tracing information, and then divides the electrolytic aluminum busbar protection cabinet line into protection areas according to the fault tracing information and the electrolytic aluminum busbar protection cabinet line information to obtain the first protection area, the second protection area, and the third protection area, and optimizes the protection lines of the three protection areas to generate the first protection line, the second protection line, and the third protection line, which are connected to the busbar protection cabinet line to obtain the protection cabinet line connection optimization information, and finally the flexible DC microgrid electrolytic aluminum system is protected by the protection cabinet line connection optimization information, which solves the technical problem in the prior art that the protection line setting is not accurate enough, resulting in poor protection effect, optimizes the protection line, and improves the protection effect of the flexible DC microgrid electrolytic aluminum system.

[0074] The following are system embodiments of the present disclosure, which can be used to execute the method embodiments of the present disclosure. For details not disclosed in the system embodiments of the present disclosure, please refer to the method embodiments of the present disclosure.

[0075] See also Figure 4 , Figure 4A block diagram of a protection system for a flexible DC microgrid aluminum electrolysis system provided by an embodiment of the present disclosure is shown. The protection system for a flexible DC microgrid aluminum electrolysis system can be implemented as all or part of the system through software, hardware, or a combination of both. The protection system for a flexible DC microgrid aluminum electrolysis system includes an information acquisition module 11, a source tracing analysis module 12, a protection area segmentation module 13, a line optimization generation module 14, an optimization information acquisition module 15, and a line protection module 16, wherein:

[0076] The information acquisition module 11 is used to obtain the historical fault information of the flexible DC microgrid aluminum electrolysis system and the line information of the aluminum electrolysis busbar protection cabinet;

[0077] The source tracing analysis module 12 is used to perform source tracing analysis on historical fault information to obtain fault tracing information;

[0078] The protection area segmentation module 13 is used to segment the protection area of ​​the electrolytic aluminum busbar protection cabinet line according to the fault tracing information and the electrolytic aluminum busbar protection cabinet line information to obtain multiple protection areas;

[0079] A line optimization generation module 14 is used to optimize the protection lines of each protection area according to the fault tracing information to generate corresponding protection lines;

[0080] The optimization information acquisition module 15 is used to obtain the protection cabinet line connection optimization information according to all protection lines;

[0081] The line protection module 16 is used to perform line protection on the flexible DC microgrid aluminum electrolysis system according to the protection cabinet line connection optimization information.

[0082] In an embodiment of the present disclosure, the information acquisition module 11 is connected to the flexible DC microgrid aluminum electrolysis system.

[0083] Optionally, the source tracing analysis module 12 is specifically used to: obtain the fault cause, fault type and fault location using historical fault information in combination with the principle of line operation; and obtain fault tracing information based on the fault cause, fault type and fault location.

[0084] Optionally, the protection area segmentation module 13 is specifically used to: classify the faults according to the similarity of the fault tracing information, and combine the line information of the electrolytic aluminum busbar protection cabinet to determine the line range where each fault type occurs in the busbar protection cabinet line; divide the line range radiated by each fault type into different protection areas.

[0085] Optionally, the line optimization generation module 14 is specifically used to: eliminate the fault by replacing components or changing the line connection method according to the fault cause and fault type in each protection area; and obtain the corresponding protection line based on the information of the replaced components or the changed line connection method.

[0086] Optionally, the plurality of protection areas include a first protection area, a second protection area, and a third protection area, and the corresponding protection circuits include a first protection circuit, a second protection circuit, and a third protection circuit.

[0087] Optionally, the protection area segmentation module 13 includes a cluster analysis module, a fault line matching module and a protection area segmentation module, wherein the cluster analysis module is used to perform cluster analysis on the fault tracing information to obtain multiple types of fault cause information; the fault line matching module is used to match the fault line according to the multiple types of fault cause information and the electrolytic aluminum busbar protection cabinet line information to obtain the fault line matching result; the protection area segmentation module is used to perform protection area segmentation on the electrolytic aluminum busbar protection cabinet line according to the fault line matching result to obtain the first protection area, the second protection area, and the third protection area.

[0088] Optionally, the line optimization generation module 14 includes a protection evaluation information generation module, an optimization information generation module and a first protection line generation module, wherein the protection evaluation information generation module is used to analyze the protection effect of the checking diode according to the fault tracing information, and generate the checking diode protection evaluation information; the optimization information generation module is used to optimize the checking diode according to the checking diode protection evaluation information, and generate the checking diode optimization information, and the checking diode optimization information includes the checking diode model information and quantity information; the first protection line generation module is used to construct a diode absorption loop according to the checking diode model information and quantity information and use it as the first protection line, add the first protection line to the protection cabinet line connection optimization information, and perform line protection on the flexible DC microgrid electrolytic aluminum system.

[0089] Optionally, the line optimization generation module 14 also includes a fuse evaluation information generation module, a fuse optimization module and a second protection line generation module, wherein the fuse evaluation information generation module is used to analyze the current breaking effect of the fuse according to the fault tracing information to generate fuse evaluation information; the fuse optimization module is used to optimize the fuse according to the fuse evaluation information to generate fuse optimization information, and the fuse optimization information includes fuse model, quantity and connection method information; the fuse model, quantity and connection method information is added as the second protection line to the protection cabinet line connection optimization information for line protection.

[0090] Optionally, the line optimization generation module 14 also includes an isolating switch parameter acquisition module, a voltage breaking effect evaluation module, an isolating switch optimization module and a third protection line generation module, wherein the isolating switch parameter acquisition module is used to analyze the switch design parameters and maximum load breaking voltage parameters of the isolating switch according to the fault tracing information; the voltage breaking effect evaluation module is used to evaluate the voltage breaking effect of the isolating switch through the switch design parameters and the maximum load breaking voltage parameters to obtain isolating switch evaluation information; the isolating switch optimization module is used to optimize the isolating switch according to the isolating switch evaluation information to obtain isolating switch optimization information; the third protection line generation module is used to generate a third protection line according to the isolating switch optimization information and add it to the protection cabinet line connection optimization information for line protection.

[0091] Optionally, the protection system for the flexible DC microgrid electrolytic aluminum system also includes a ripple voltage acquisition module, a ripple voltage parameter judgment module and an electromagnetic interference filtering module, wherein the ripple voltage acquisition module is used to collect and obtain the ripple voltage parameters of the electrolytic aluminum busbar; the ripple voltage parameter judgment module is used to judge whether the ripple voltage parameters of the electrolytic aluminum busbar are greater than the busbar ripple voltage parameter threshold; the electromagnetic interference filtering module is used to add an EMI filtering device in the electrolytic aluminum busbar protection cabinet line, and filter out electromagnetic interference through the EMI filtering device.

[0092] Optionally, the protection system for the flexible DC microgrid electrolytic aluminum system also includes a residual current detection module, a power generation control module and a fault detection module, wherein the residual current detection module is used to add a residual current detection device in the electrolytic aluminum busbar protection cabinet line, and determine whether a ground short circuit fault occurs according to the residual current detection device; the power generation control module is used to generate a stop power generation instruction, control the DC microgrid to stop power generation according to the stop power generation instruction, and generate fault warning information; the fault detection module is used to perform fault detection on the electrolytic aluminum busbar protection cabinet line according to the fault warning information.

[0093] It should be noted that the protection system for the flexible DC microgrid aluminum electrolysis system provided in the above embodiment only uses the division of the above functional modules as an example when executing the protection method for the flexible DC microgrid aluminum electrolysis system. In actual applications, the above functional distribution can be completed by different functional modules as needed, that is, the internal structure of the protection device for the flexible DC microgrid aluminum electrolysis system is divided into different functional modules to complete all or part of the functions described above. In addition, the protection system for the flexible DC microgrid aluminum electrolysis system provided in the above embodiment and the protection method embodiment for the flexible DC microgrid aluminum electrolysis system belong to the same concept, and the implementation process thereof is detailed in the method embodiment, which will not be repeated here.

[0094] The serial numbers of the above-mentioned embodiments of the present disclosure are only for description and do not represent the advantages or disadvantages of the embodiments.

[0095] In the protection system for the flexible DC microgrid aluminum electrolytic system of the disclosed embodiment, the information acquisition module is used to obtain historical fault information of the flexible DC microgrid aluminum electrolytic system and line information of the aluminum electrolytic bus protection cabinet; the source tracing analysis module is used to perform source tracing analysis on the historical fault information to obtain fault tracing information; the protection area segmentation module is used to perform protection area segmentation on the aluminum electrolytic bus protection cabinet line according to the fault tracing information and the aluminum electrolytic bus protection cabinet line information to obtain multiple protection areas; the line optimization generation module is used to optimize the protection line of each protection area according to the fault tracing information to generate a corresponding protection line; the optimization information acquisition module is used to obtain the protection cabinet line connection optimization information according to the first protection line, the second protection line and the third protection line; the line protection module is used to perform line protection on the flexible DC microgrid aluminum electrolytic system according to the protection cabinet line connection optimization information. In this case, historical fault information and line information of the electrolytic aluminum busbar protection cabinet are obtained, and after analyzing the fault tracing information, the electrolytic aluminum busbar protection cabinet line is divided into multiple protection areas, and the protection lines of multiple areas are optimized to generate corresponding protection lines. Finally, the flexible DC microgrid electrolytic aluminum system is protected through all protection lines, which solves the technical problem of poor protection effect caused by inaccurate protection line setting in the prior art, realizes the optimization of protection lines, and improves the protection effect of the flexible DC microgrid electrolytic aluminum system.

[0096] According to an embodiment of the present disclosure, the present disclosure also provides a protection device for a flexible DC microgrid aluminum electrolysis system, a readable storage medium and a computer program product.

[0097] Figure 5 It is a block diagram of a protection device for a flexible DC microgrid aluminum electrolysis system used to implement the protection method for a flexible DC microgrid aluminum electrolysis system of an embodiment of the present disclosure. The protection device for a flexible DC microgrid aluminum electrolysis system is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workbenches, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The protection device for a flexible DC microgrid aluminum electrolysis system can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable electronic devices, and other similar computing devices. The components, connections and relationships of the components, and functions of the components shown in the present disclosure are merely examples and are not intended to limit the implementation of the present disclosure described and / or required in the present disclosure.

[0098] like Figure 5As shown, the protection device 20 for the flexible DC microgrid aluminum electrolysis system includes a computing unit 21, which can perform various appropriate actions and processes according to a computer program stored in a read-only memory (ROM) 22 or a computer program loaded from a storage unit 28 to a random access memory (RAM) 23. In the RAM 23, various programs and data required for the operation of the protection device 20 for the flexible DC microgrid aluminum electrolysis system can also be stored. The computing unit 21, the ROM 22, and the RAM 23 are connected to each other through a bus 24. An input / output (I / O) interface 25 is also connected to the bus 24.

[0099] Multiple components in the protection device 20 for the flexible DC microgrid aluminum electrolysis system are connected to the I / O interface 25, including: an input unit 26, such as a keyboard, a mouse, etc.; an output unit 27, such as various types of displays, speakers, etc.; a storage unit 28, such as a disk, an optical disk, etc., which is communicatively connected to the computing unit 21; and a communication unit 29, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 29 allows the protection device 20 for the flexible DC microgrid aluminum electrolysis system to exchange information / data with other protection devices for the flexible DC microgrid aluminum electrolysis system through a computer network such as the Internet and / or various telecommunication networks.

[0100] The computing unit 21 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the computing unit 21 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various computing units running machine learning model algorithms, digital signal processors (DSPs), and any appropriate processors, controllers, microcontrollers, etc. The computing unit 21 performs the various methods and processes described above, such as executing a protection method for a flexible DC microgrid electrolytic aluminum system. For example, in some embodiments, the protection method for a flexible DC microgrid electrolytic aluminum system may be implemented as a computer software program, which is tangibly contained in a machine-readable medium, such as a storage unit 28. In some embodiments, part or all of the computer program may be loaded and / or installed on a protection device 20 for a flexible DC microgrid electrolytic aluminum system via a ROM 22 and / or a communication unit 29. When the computer program is loaded into the RAM 23 and executed by the computing unit 21, one or more steps of the protection method for a flexible DC microgrid electrolytic aluminum system described above may be performed. Alternatively, in other embodiments, the computing unit 21 may be configured to execute the protection method for the flexible DC microgrid aluminum electrolysis system in any other appropriate manner (for example, by means of firmware).

[0101] Various embodiments of the systems and techniques described above in the present disclosure may be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0102] The program code for implementing the method of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that the program code, when executed by the processor or controller, enables the functions / operations specified in the flow chart and / or block diagram to be implemented. The program code may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0103] In the present disclosure, a machine-readable medium may be a tangible medium that may contain or store a program for use by an instruction execution system, a device, or a protection device for a flexible DC microgrid aluminum electrolysis system or in combination with an instruction execution system, a device, or a protection device for a flexible DC microgrid aluminum electrolysis system. The machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. The machine-readable medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or electronic devices, or any suitable combination of the above. More specific examples of machine-readable storage media may include electrical connections based on one or more wires, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories (CD-ROM), optical storage electronic devices, magnetic storage electronic devices, or any suitable combination of the above.

[0104] To provide interaction with a user, the systems and techniques described herein can be implemented on a computer having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user can provide input to the computer. Other types of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0105] The systems and techniques described herein can be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), the Internet, and a blockchain network.

[0106] A computer system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The relationship between the client and the server is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services ("Virtual Private Server", or "VPS" for short). The server may also be a server of a distributed system, or a server combined with a blockchain.

[0107] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this disclosure can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solutions disclosed in this disclosure can be achieved, and this disclosure is not limited here.

[0108] The above specific implementations do not constitute a limitation on the protection scope of the present disclosure. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A protection method for a flexible DC microgrid aluminum electrolysis system, characterized in that: include: Obtain historical fault information of the flexible DC microgrid aluminum electrolysis system and line information of the aluminum electrolysis busbar protection cabinet; Performing source tracing analysis on the historical fault information to obtain fault source tracing information; According to the fault tracing information and the line information of the electrolytic aluminum busbar protection cabinet, the protection area of ​​the electrolytic aluminum busbar protection cabinet line is divided to obtain multiple protection areas; Optimize the protection lines of each protection area according to the fault tracing information to generate corresponding protection lines; Obtain protection cabinet line connection optimization information based on all protection lines; The flexible DC microgrid aluminum electrolysis system is protected by lines according to the protection cabinet line connection optimization information.

2. The protection method for a flexible DC microgrid aluminum electrolysis system according to claim 1, characterized in that: The performing source tracing analysis on the historical fault information to obtain fault source tracing information includes: In combination with the principle of line operation, the historical fault information is used to obtain the fault cause, fault type and fault location; The fault tracing information is obtained based on the fault cause, the fault type and the fault location.

3. The protection method for a flexible DC microgrid aluminum electrolysis system according to claim 2, characterized in that: The protection area division of the electrolytic aluminum busbar protection cabinet line according to the fault tracing information and the electrolytic aluminum busbar protection cabinet line information includes: The faults are classified according to the similarity of the fault tracing information, and combined with the line information of the electrolytic aluminum busbar protection cabinet to determine the line range where each fault type occurs in the busbar protection cabinet line; the line range radiated by each fault type is divided into different protection areas.

4. The protection method for a flexible DC microgrid aluminum electrolysis system according to claim 3, characterized in that: Cluster analysis is used when classifying faults according to the similarity of the fault tracing information.

5. The protection method for a flexible DC microgrid aluminum electrolysis system according to claim 2, characterized in that: The optimizing the protection lines of each protection area according to the fault tracing information to generate corresponding protection lines includes: According to the cause and type of fault in each protection area, the fault is eliminated by replacing components or changing the line connection method; The corresponding protection circuit is obtained based on the information of the replaced component or the changed circuit connection mode.

6. A protection system for a flexible DC microgrid aluminum electrolysis system, characterized in that: include: An information acquisition module is used to obtain historical fault information of the flexible DC microgrid aluminum electrolysis system and line information of the aluminum electrolysis busbar protection cabinet; A source tracing analysis module is used to perform source tracing analysis on the historical fault information to obtain fault tracing information; A protection area segmentation module is used to segment the protection area of ​​the electrolytic aluminum busbar protection cabinet line according to the fault tracing information and the electrolytic aluminum busbar protection cabinet line information to obtain multiple protection areas; A line optimization generation module, used to optimize the protection line of each protection area according to the fault tracing information to generate a corresponding protection line; An optimization information acquisition module is used to obtain protection cabinet line connection optimization information based on all protection lines; The line protection module is used to perform line protection on the flexible DC microgrid aluminum electrolysis system according to the line connection optimization information of the protection cabinet.

7. The protection system for a flexible DC microgrid aluminum electrolysis system according to claim 6, characterized in that: The tracing analysis module is specifically used to: combine the principle of line operation and use the historical fault information to obtain the fault cause, fault type and fault location; obtain the fault tracing information based on the fault cause, fault type and fault location.

8. The protection system for the flexible DC microgrid aluminum electrolysis system according to claim 7, characterized in that: The protection area segmentation module is specifically used to: classify the faults according to the similarity of the fault tracing information, and combine the line information of the electrolytic aluminum busbar protection cabinet to determine the line range where each fault type occurs in the busbar protection cabinet line; divide the line range radiated by each fault type into different protection areas.

9. The protection system for a flexible DC microgrid aluminum electrolysis system according to claim 8, characterized in that: The line optimization generation module is specifically used to: eliminate the fault by replacing components or changing the line connection mode according to the fault cause and fault type in each protection area; and obtain the corresponding protection line based on the information of the replaced components or the changed line connection mode.

10. A protection device for a flexible DC microgrid aluminum electrolysis system, characterized in that: include: at least one processor; And a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the protection method for a flexible DC microgrid electrolytic aluminum system as described in any one of claims 1-5.

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