Single-end transient voltage energy type direct current line protection setting method and system

Abstract

The application discloses a kind of single-end transient voltage energy type DC line protection setting method and system, obtain the line parameter of each frequency-dependent DC line in DC transmission system, obtain line mode propagation constant;Obtain the mode domain parameter of other elements of DC transmission system, calculate the equivalent impedance of the protected line from line fault point, obtain the line mode voltage division coefficient caused by transition resistance and mode domain network by using the equivalent impedance;Realize line mode fault voltage frequency response analysis;Obtain the extraction frequency band of the set transient quantity protection, determine the weakest fault transfer function when the weakest fault occurs in the area, construct voltage step function;Using the voltage step function carries out the calculation of transient energy, obtains the setting value of DC line protection based on single-end voltage transient energy.The present application can obtain accurate positioning of the weakest fault, thereby accurately calculating the setting value of DC single-end transient quantity protection.

Description

Technical Field

[0001] This invention relates to the fields of relay protection for DC transmission systems and new energy grid connection systems, and in particular to a setting method and system for single-ended DC line protection. Background Technology

[0002] In long-distance power transmission, high-voltage direct current (HVDC) systems offer advantages such as low loss, small footprint, and low cost. However, the overcurrent capacity of power electronic components in HVDC grids (e.g., MMC-HVDC) is limited. Furthermore, with the development of DC transmission technology, the application scenarios of DC grids are becoming increasingly complex. Examples include large-scale long-distance power transmission on land, multi-terminal interconnection of asynchronous grids, islanded networking, and offshore wind power transmission. This places higher demands on the speed of DC line protection, its adaptability in different scenarios, and its practicality in engineering applications.

[0003] Frequency-domain-based transient quantity protection in single-ended quantity protection is the single-ended transient quantity protection technology in DC single-ended quantity protection, i.e., it corresponds to DC single-ended transient quantity protection. However, the settings of most current single-ended transient quantity protection criteria require extensive simulations to obtain, lacking theoretical basis. When the protection needs to be applied to multiple projects, or when the system operation changes, the setup, adjustment, and testing of simulations consume a significant amount of time. In addition, some existing setting methods are only for a specific scenario and are not clear enough in analyzing and locating the weakest fault within the area. Therefore, there is an urgent need for a method that can accurately calculate the settings of DC single-ended transient quantity protection using the weakest fault within the area. Summary of the Invention

[0004] This invention proposes a setting method and system for DC line protection based on single-ended transient voltage energy. By acquiring and calculating line parameters, the method performs frequency response analysis of line-mode fault voltage, thereby determining the weakest fault in the area and calculating the setting value of DC line protection based on single-ended transient voltage energy.

[0005] In a first aspect, the present invention provides a setting method for single-ended transient voltage energy-type DC line protection, the method comprising:

[0006] The line parameters of each frequency-dependent DC line in the DC transmission system are obtained, and the ground mode wave impedance and line mode wave impedance are obtained based on the line parameters. The line mode propagation constant is obtained based on the ground mode wave impedance and line mode wave impedance.

[0007] Perform frequency response analysis of line-mode fault voltage:

[0008] i. Obtain the modal domain parameters of other components in the DC transmission system, and calculate the equivalent impedance from the fault point of the protected frequency-dependent DC line when there is a fault at different locations;

[0009] ii. Using the equivalent impedance, obtain the line-mode voltage division coefficient caused by the transition resistance and the mode network;

[0010] iii. Based on the obtained line mode propagation constant and line mode voltage divider coefficient, calculate the line mode fault voltage transfer function with the fault voltage at the fault point as excitation and the fault voltage at the protection installation point as response;

[0011] The extraction frequency band of the transient quantity protection is obtained, and the weakest fault voltage transfer function in the frequency band is determined to construct the voltage step function.

[0012] The transient energy is calculated using the voltage step function to obtain the setting value for DC line protection based on single-ended voltage transient energy.

[0013] In some embodiments, the ground mode wave impedance and line mode wave impedance are obtained based on the line parameters, and the line mode propagation constant is obtained based on the ground mode wave impedance and line mode wave impedance, further including:

[0014] Calculate the ground mode impedance of the frequency-dependent DC line based on the aforementioned line parameters. Linear mode impedance and linear mode propagation constant ;

[0015] The ground mode wave impedance and the line mode impedance The calculation formula is:

[0016] ;

[0017] In the formula, , This represents the line's self-impedance and mutual impedance. , Indicates the self-admittance and mutual admittance of the line;

[0018] And obtain the linear mode propagation constant. The calculation formula is:

[0019] ;

[0020] In some embodiments, calculating the equivalent impedance from the fault point of the protected frequency-dependent DC line when a fault occurs at different locations on the line, based on the modal domain parameters of the line and other components, further includes:

[0021] Obtain the module domain parameters of other components in the DC transmission system, including at least the DC voltage during normal operation. Converter station equivalent impedance Current-limiting reactor And so on, and calculate the equivalent impedance from the fault point of the protected frequency-dependent DC line when there is a fault at different locations. Equivalent impedance There are three types of faults: faults at the beginning of the line, faults in the middle of the line, and faults at the end of the line.

[0022] Ground mode equivalent impedance in three cases and line mode equivalent impedance The calculation formula is:

[0023] ;

[0024] In the formula, and These represent the system ground mode equivalent impedance at the back side of the beginning of the line and the system ground mode equivalent impedance at the back side of the end of the line, respectively. and These represent the ground-mode impedance and line-mode impedance of the protected line, respectively, with || indicating parallel connection. and These represent the system line mode equivalent impedance at the back side of the beginning of the line and the system line mode equivalent impedance at the back side of the end of the line, respectively.

[0025] Furthermore, the voltage division coefficient of the linear modulus is obtained. The calculation formula is as follows:

[0026] ;

[0027] In the formula, This is the transition resistance.

[0028] In some embodiments, based on the obtained line-mode propagation constant and the line-mode voltage divider coefficient, a line-mode fault voltage transfer function is obtained, which takes the fault voltage at the fault point as excitation and the fault voltage at the protection installation point as response, and further includes:

[0029] The line mode reflection coefficient at the protected installation location is obtained. The calculation formula is:

[0030] ;

[0031] Based on the parameters obtained from the above steps, calculate the line-mode fault voltage transfer function, which takes the fault voltage at the fault point as the excitation and the fault voltage at the protection installation point as the response. The calculation formula is:

[0032] ;

[0033] In some implementations, the extraction frequency band of the transient quantity protection is obtained, and the weakest fault voltage transfer function within the frequency band is determined to construct a voltage step function, further including:

[0034] Protect the lower limit of the extracted frequency band with transient quantities Weakest fault transfer function amplitude at frequency Multiplied by rated voltage Construct a voltage step function.

[0035] The transient energy is calculated using the voltage step function to obtain the setting value for DC line protection based on single-ended voltage transient energy. This further includes: calculating the transient energy of the voltage step function using a single-ended voltage transient energy algorithm to obtain the transient energy value under the weakest fault condition. The formula for calculating the setting value of DC line protection based on single-ended voltage transient energy is as follows: , This is the reliability coefficient.

[0036] Secondly, the present invention provides a setting system for a single-ended transient voltage energy-type DC line protection system, which implements the claim of a setting method for such protection. The system includes a line parameter calculation module, a line-mode fault voltage frequency response analysis module, a weakest fault determination module within the protection zone, and a setting calculation module; wherein:

[0037] The line parameter calculation module obtains the line parameters of each frequency-dependent DC line in the DC transmission system, obtains the ground mode wave impedance and line mode wave impedance based on the line parameters, and obtains the line mode propagation constant based on the ground mode wave impedance and line mode wave impedance.

[0038] The line-mode fault voltage frequency response analysis module performs line-mode fault voltage frequency response analysis.

[0039] i. Obtain the modal domain parameters of other components in the DC transmission system, and calculate the equivalent impedance from the fault point of the protected frequency-dependent DC line when there is a fault at different locations;

[0040] ii. Using the equivalent impedance, obtain the line-mode voltage division coefficient caused by the transition resistance and the mode network;

[0041] iii. Based on the obtained line mode propagation constant and line mode voltage divider coefficient, calculate the line mode fault voltage transfer function with the fault voltage at the fault point as excitation and the fault voltage at the protection installation point as response;

[0042] The weakest fault determination module in the area obtains the extraction frequency band of the set transient quantity protection, determines the weakest fault voltage transfer function in the frequency band area, and constructs the voltage step function.

[0043] The setting value calculation module uses the voltage step function to calculate transient energy and obtains the setting value of DC line protection based on single-end voltage transient energy.

[0044] In some implementations, the transient energy is calculated using the voltage step function to obtain the setting value for DC line protection based on single-ended voltage transient energy. This further includes: calculating the transient energy of the voltage step function using a single-ended voltage transient energy algorithm to obtain the transient energy value under the weakest fault condition. The formula for calculating the setting value of DC line protection based on single-ended voltage transient energy is as follows: , This is the reliability coefficient.

[0045] Thirdly, the present invention provides an electronic device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement a setting method for a single-ended transient voltage energy-type DC line protection provided in any of the above embodiments.

[0046] Fourthly, the present invention provides a non-transient computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements a setting method for a single-ended transient voltage energy-type DC line protection provided in any of the above embodiments.

[0047] Compared with the prior art, the beneficial effects and advantages of the present invention are as follows:

[0048] 1) By using the obtained line mode propagation constant and line mode voltage divider coefficient, a line mode fault voltage transfer function is obtained, which takes the fault voltage at the fault point as the excitation and the fault voltage at the protection installation point as the response. This enables the system to achieve a fast, accurate and stable dynamic response. It is a design that balances the speed and stability of the system and realizes the setting value of the single-ended transient voltage energy type DC line protection, thereby optimizing the performance of the control system.

[0049] 2) Find the line-mode fault voltage transfer function with the smallest amplitude when a fault occurs at different distances in the line, and use it as the weakest fault transfer function when the weakest fault occurs in the area. Based on the weakest fault transfer function, obtain the setting value of DC line protection based on single-ended voltage transient energy, and obtain the accurate location of the weakest fault.

[0050] 3) Construct a voltage step function based on the weakest fault transfer function, thereby shortening the setting calculation time by utilizing the voltage step function;

[0051] 4) The transient energy is calculated using the voltage step function to obtain the setting value of DC line protection based on single-ended voltage transient energy, which enables accurate calculation of the DC single-ended transient quantity protection setting value. Attached Figure Description

[0052] Figure 1 This is an overall flowchart of the setting method for a single-ended transient voltage energy-type DC line protection according to the present invention;

[0053] Figure 2 This is a technical roadmap of the setting method for a single-ended transient voltage energy-type DC line protection according to the present invention;

[0054] Figure 3 This is a schematic diagram of the topology of the test system in an embodiment of the present invention when it fails;

[0055] Figure 4 This is a schematic diagram of the equivalent network of the modal domain fault when the test system experiences a line fault, according to an embodiment of the present invention.

[0056] Figure 5 This is a schematic diagram of the physical parameters of the DC overhead line of the test system according to an embodiment of the present invention;

[0057] Figure 6 This is a block diagram of a setting system for a single-ended transient voltage energy-type DC line protection according to the present invention. Detailed Implementation

[0058] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0059] Figure 1 This invention illustrates a setting method for a single-ended transient voltage energy-type DC line protection system, with the specific steps as follows:

[0060] Step 1: Obtain the line parameters of each frequency-dependent DC line in the DC transmission system. Based on the line parameters, obtain the ground mode wave impedance and the line mode wave impedance. Based on the ground mode wave impedance and the line mode wave impedance, obtain the line mode propagation constant.

[0061] Step 1.1: Calculate the parameters of each frequency-dependent DC line in the DC transmission system using electromagnetic field theory and Carson's formula, including two frequency-varying parameters: the phase domain impedance matrix. and phase domain admittance matrix , and from the phase domain impedance matrix Extracting the self-impedance of the line and mutual impedance From the phase domain admittance matrix Extract the self-admittance of the circuit and mutual conductance ;

[0062] Step 1.2: Calculate the ground mode impedance of the frequency-dependent DC line based on the calculated line parameters. Linear mode impedance and linear mode propagation constant ;

[0063] Specifically, the ground mode wave impedance and the line mode impedance The calculation formula is:

[0064] ; (1)

[0065] Specifically, the linear mode propagation constant The calculation formula is:

[0066] (2)

[0067] Step 2: Obtain the mode domain parameters of other components of the DC transmission system. Calculate the equivalent impedance from the fault point of each protected line when there is a fault at different locations based on the line mode domain parameters. Use the equivalent impedance to obtain the line mode voltage division coefficient caused by the transition resistance and mode domain network. Based on the obtained line mode propagation constant and the line mode voltage division coefficient, obtain the line mode fault voltage transfer function with the fault voltage at the fault point as the excitation and the fault voltage at the protection installation point as the response, so as to realize the line mode fault voltage frequency response analysis.

[0068] Step 2.1: Obtain the module domain parameters of other components in the DC transmission system, including at least the DC voltage during normal operation. Converter station equivalent impedance Current-limiting reactor And so on, and calculate the equivalent impedance from the fault point of the protected frequency-dependent DC line when there is a fault at different locations. Equivalent impedance There are three scenarios: fault at the beginning of the line, fault in the middle of the line, and fault at the end of the line. The equivalent impedance of the ground mode is given in each of these three scenarios. and line mode equivalent impedance The calculation formula is:

[0069] (3)

[0070] In the formula, and These represent the equivalent impedance of the system ground mode on the back side of the beginning of the line and the equivalent impedance of the system ground mode on the back side of the end of the line, respectively, with || indicating parallel connection; for example, Figure 2 In the system topology shown, if protection A is set, then , m = 0 or 1, representing the ground mode component or the line mode component;

[0071] Step 2.3: Based on the equivalent impedance of the ground mode as seen from the line fault point obtained in Step 3. and line mode equivalent impedance Collectively referred to as equivalent impedance Calculate the transition resistance as follows: The linear modulus voltage divider C at that time u (1) (f). By Figure 4 As shown in the equivalent network of the fault domain, the voltage division coefficient is due to the presence of a transition resistance between the traveling wave sources on the DC line at the fault point, which diverts a portion of the fault voltage. For unipolar faults, the ground mode network also diverts a portion of the voltage. Therefore, depending on the fault pole, C u (1) (f) There are different calculation formulas:

[0072] (4)

[0073] In the formula, For transition resistance;

[0074] Step 2.4: Calculate the line-mode transfer function H of the protected frequency-dependent DC line. l (1) (f) and the linear mode reflection coefficient k at the transient protection installation location. (1) (f); Linear transfer function H l (1) The formula for calculating (f) is:

[0075] (5)

[0076] In the formula, x is the distance from the fault point to the protection installation location. The propagation constant of the linear mode;

[0077] Protective installation location line mode reflection coefficient k (1) The formula for calculating (f) is:

[0078] (6)

[0079] Step 2.5: Based on the parameters obtained in the above steps, calculate the line-mode fault voltage transfer function with the fault voltage at the fault point as the excitation and the fault voltage at the protection installation point as the response. The calculation formula is:

[0080] (7)

[0081] Step 3: Obtain the extraction frequency band of the transient protection setting, calculate the amplitude-frequency characteristic of the line-mode fault voltage transfer function within the extraction frequency band, find the line-mode fault voltage transfer function with the smallest amplitude when a fault occurs at different distances in the line, and use it as the weakest fault transfer function when the weakest fault occurs in the area. Construct a voltage step function based on the weakest fault transfer function.

[0082] Step 3.1: Obtain the lower limit of the extraction frequency band for the set transient quantity protection. and the upper limit of the extracted frequency band Calculate the required transient resistance during setting. Down, ~ Line-mode fault voltage transfer function within the frequency band Based on the amplitude-frequency characteristics, identify the line-mode fault voltage transfer function with the smallest amplitude when faults occur at different distances along the line. This refers to the weakest fault transfer function when the weakest fault occurs within the area. The selection of different fault distances should evenly cover the entire line, and 21 fault points, including the beginning and end of the line, can be selected at intervals of 1 / 20 of the line length.

[0083] Step 3.2: with Weakest fault transfer function amplitude at frequency Multiplied by rated voltage Construct a voltage step function; where the rated voltage The selection of the fault pole is related to the fault pole; for a single-pole fault, it can be selected as... For bipolar faults, the value is 2. The voltage step function is expressed as follows:

[0084] (8)

[0085] In the formula, ε(t) is the unit step function. Note that when the faults are extremely different, the weakest fault transfer function H... u_min (f L The values ​​of ) are also different;

[0086] Step 4: Calculate the transient energy of the voltage step function using the single-ended voltage transient energy algorithm to obtain the transient energy value under the weakest fault condition. ,use Divide by reliability coefficient This yields the setting values ​​for DC line protection based on single-ended voltage transient energy. The calculation formula is: .

[0087] Taking a bipolar fault as an example, after substituting specific parameters, the constructed step function is |2U|. dcN H u_min (f LThe transient energy is calculated as follows: |ε(t) = |2 * 848.3 * 0.3318|ε(t) = 562.93ε(t). This is the transient energy value extracted using the single-ended voltage transient energy algorithm. = 96264.5, if the reliability coefficient is taken = 1.5, then the protection setting value can be calculated as E set = 96264.5 / 1.5 = 64176.3.

[0088] like Figure 5 As shown, the setting system for a single-ended transient voltage energy-type DC line protection according to the present invention includes a line parameter calculation module, a line mode fault voltage frequency response analysis module, a weakest fault determination module within the zone module, and a setting calculation module. These modules respectively execute the corresponding procedures of the setting method for a single-ended transient voltage energy-type DC line protection according to the present invention.

[0089] In summary, this invention can accurately locate the weakest fault, thereby enabling accurate calculation of the DC single-ended transient protection setting.

[0090] Furthermore, based on a similar inventive concept, embodiments of the present invention also provide an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the above-described method.

[0091] Furthermore, based on a similar inventive concept, embodiments of the present invention also provide a non-transitory computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the above-described method.

[0092] 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 implemented 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. The solutions in the embodiments of the present invention can be implemented using various computer languages, such as the object-oriented programming language Java and the interpreted scripting language JavaScript.

[0093] 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.

[0094] 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.

[0095] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0096] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the invention.

[0097] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

[0098] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of the present invention should also be considered to fall within the scope of protection of the present invention.

[0099] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings and technical solutions. These descriptions are merely preferred embodiments and are not intended to limit the scope or concept of the invention. To avoid unnecessary repetition, various possible combinations are not described separately. Any combination, modification, or improvement of the specific technical features described in the above embodiments, without contradiction, should fall within the scope of protection of this invention, provided it does not depart from the concept of the invention.

Claims

1. A setting method for single-ended transient voltage energy-type DC line protection, characterized in that, The method includes: The method involves acquiring the line parameters of each frequency-dependent DC line in a DC transmission system, obtaining the ground mode wave impedance and line mode wave impedance based on the line parameters, and obtaining the line mode propagation constant based on the ground mode wave impedance and the line mode wave impedance; further comprising: calculating the ground mode wave impedance of the frequency-dependent DC line based on the line parameters. Linear mode impedance and linear mode propagation constant ; The ground mode wave impedance and the line mode impedance The calculation formula is: In the formula, , This represents the line's self-impedance and mutual impedance. , Indicates the self-admittance and mutual admittance of the line; And obtain the linear mode propagation constant. The calculation formula is: Perform frequency response analysis of line-mode fault voltage: i. Obtain the modal parameters of other components in the DC transmission system, and calculate the equivalent impedance from the fault point of the protected frequency-dependent DC line when there is a fault at different locations. ii. Using the equivalent impedance, obtain the line-mode voltage division coefficient caused by the transition resistance and the mode network; iii. Based on the obtained line mode propagation constant and line mode voltage divider coefficient, calculate the line mode fault voltage transfer function with the fault voltage at the fault point as excitation and the fault voltage at the protection installation point as response; The extraction frequency band of the transient quantity protection to be set is obtained, and the weakest fault voltage transfer function within the frequency band is determined to construct a voltage step function; further including: Protect the lower limit of the extracted frequency band with transient quantities Weakest fault transfer function amplitude at frequency Multiplied by rated voltage Construct the voltage step function; The transient energy is calculated using the voltage step function to obtain the setting value for DC line protection based on single-ended voltage transient energy.

2. The setting method for a single-ended transient voltage energy-type DC line protection according to claim 1, characterized in that, The equivalent impedance of the protected frequency-dependent DC line at different fault locations is calculated based on the modal domain parameters of the line and other components, as viewed from the fault point. This further includes: Obtain the module domain parameters of other components in the DC transmission system, including at least the DC voltage during normal operation. Converter station equivalent impedance Current-limiting reactor The equivalent impedance from the fault point on the protected frequency-dependent DC line was calculated when a fault occurred at different locations on the line. Equivalent impedance There are three types of faults: faults at the beginning of the line, faults in the middle of the line, and faults at the end of the line. Ground mode equivalent impedance in three cases and line mode equivalent impedance The calculation formula is: ; In the formula, and These represent the system ground mode equivalent impedance at the back side of the beginning of the line and the system ground mode equivalent impedance at the back side of the end of the line, respectively. and These represent the ground-mode impedance and line-mode impedance of the protected line, respectively, with || indicating parallel connection. and These represent the system line mode equivalent impedance at the back side of the beginning of the line and the system line mode equivalent impedance at the back side of the end of the line, respectively. Furthermore, the voltage division coefficient of the linear modulus is obtained. The calculation formula is as follows: In the formula, This is the transition resistance.

3. The setting method for a single-ended transient voltage energy-type DC line protection according to claim 2, characterized in that, Based on the obtained line mode propagation constant and line mode voltage divider coefficient, a line mode fault voltage transfer function is obtained, which takes the fault voltage at the fault point as excitation and the fault voltage at the protection installation point as response, and further includes: The line mode reflection coefficient at the protected installation location is obtained. The calculation formula is: Based on the parameters obtained from the above steps, calculate the line-mode fault voltage transfer function, which takes the fault voltage at the fault point as the excitation and the fault voltage at the protection installation point as the response. The calculation formula is: in, x This is the distance from the fault point to the protection installation location.

4. The setting method for a single-ended transient voltage energy-type DC line protection according to claim 1, characterized in that, The transient energy is calculated using the voltage step function to obtain the setting value of DC line protection based on single-ended voltage transient energy. This further includes: calculating the transient energy of the voltage step function using a single-ended voltage transient energy algorithm to obtain the transient energy value under the weakest fault condition. The formula for calculating the setting value of DC line protection based on single-ended voltage transient energy is as follows: , This is the reliability coefficient.

5. A setting system for a single-ended transient voltage energy-type DC line protection system, implementing the setting method for a single-ended transient voltage energy-type DC line protection system according to any one of claims 1 to 4, characterized in that, The system includes a line parameter calculation module, a line mode fault voltage frequency response analysis module, a weakest fault determination module within the area module, and a setting value calculation module; among which: The line parameter calculation module obtains the line parameters of each frequency-dependent DC line in the DC transmission system, obtains the ground mode wave impedance and line mode wave impedance based on the line parameters, and obtains the line mode propagation constant based on the ground mode wave impedance and line mode wave impedance. The line-mode fault voltage frequency response analysis module performs line-mode fault voltage frequency response analysis. i. Obtain the modal parameters of other components in the DC transmission system, and calculate the equivalent impedance from the fault point of the protected frequency-dependent DC line when there is a fault at different locations. ii. Using the equivalent impedance, obtain the line-mode voltage division coefficient caused by the transition resistance and the mode network; iii. Based on the obtained line mode propagation constant and line mode voltage divider coefficient, calculate the line mode fault voltage transfer function with the fault voltage at the fault point as excitation and the fault voltage at the protection installation point as response; The weakest fault determination module in the area obtains the extraction frequency band of the set transient quantity protection, determines the weakest fault voltage transfer function in the frequency band area, and constructs the voltage step function. The setting value calculation module uses the voltage step function to calculate transient energy and obtains the setting value of DC line protection based on single-end voltage transient energy.

6. An electronic device, comprising: The system includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements a setting method for a single-ended transient voltage energy-type DC line protection according to any one of claims 1 to 4.

7. A non-transient computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements a setting method for a single-ended transient voltage energy-type DC line protection according to any one of claims 1 to 4.

Images