Power distribution line transfer method and device

Abstract

The invention discloses a wheeling method and device for a distribution line, and the method comprises the steps: determining a sensitivity adaptive value of a wheeling alternative line according to the design parameters of a fault line and the wheeling alternative line; and according to the operation parameters of the fault line and the operation parameters and the design parameters of the alternative transfer lines, determining load rate adaptive values of the alternative transfer lines. And determining a reliability index of the alternative transfer line according to the historical fault data of the alternative transfer line. And in combination with the corresponding sensitivity adaptive value, the load rate adaptive value and the reliability index, determining the wheeling adaptation degree of the wheeling alternative line relative to the fault line. And on the basis of the transfer adaptation degree, the transfer target line is determined from the transfer alternative lines, so that the selection of the transfer lines is realized, the transfer capability analysis is carried out on each transfer alternative line in combination with the sensitivity, the load rate and the reliability, and the transfer speed and the reliability are improved.

Description

Technical Field

[0001] The present invention relates to the field of power distribution, and in particular to a power transfer method and device for a power distribution line. Background Art

[0002] In recent years, with the rapid progress of science and technology and the rapid development of society, people are increasingly dependent on electrical appliances in production and life, and the power supply reliability of lines has become particularly important.

[0003] When a line fails, the power department will use the adjacent lines of the faulty line to transfer power to users in the faulty area to minimize the impact of the fault on users.

[0004] However, the faulty line often corresponds to multiple transferable lines. How to determine the target line from multiple transferable lines has become a key research issue for the power sector. The current method of determining the transfer line is often time-consuming, which increases the duration of the fault's impact on users. Summary of the invention

[0005] The present invention provides a power transfer method and device for a power distribution line, which improves the power transfer speed and power transfer reliability.

[0006] According to one aspect of the present invention, a method for transferring power supply of a distribution line is provided, and the method for transferring power supply of a distribution line comprises:

[0007] Determining the sensitivity adaptation value of the alternative transfer line according to the design parameters of the fault line and the alternative transfer line;

[0008] Determining a load rate adaptation value of the alternate transfer line according to the operating parameters of the fault line, the operating parameters of the alternate transfer line and the design parameters;

[0009] Determining a reliability index of the alternative power transfer line according to historical fault data of the alternative power transfer line;

[0010] Determine the adaptability of the alternate power transfer line relative to the fault line by combining the corresponding sensitivity adaptation value, the load rate adaptation value and the reliability index;

[0011] Based on the transfer adaptability, a transfer target line is determined from the transfer candidate lines.

[0012] Optionally, the design parameters include line type, line length and action setting value of protection device;

[0013] The step of determining the sensitivity adaptation value of the alternate power transfer line according to the design parameters of the faulty line and the alternate power transfer line comprises:

[0014] Calculate the minimum short-circuit current at the end of the composite line after the transfer according to the line type and line length of the fault line and the transfer alternative line;

[0015] According to the minimum short-circuit current and the action setting value of the protection device, judging whether each of the protection devices in the composite circuit is effective;

[0016] When all the protection devices in the composite line are effective, determining the sensitivity adaptation value of the corresponding transfer candidate line to be a first preset value;

[0017] In the case where the protection device in the composite circuit is invalid, judging whether the composite circuit meets the sensitivity requirement according to the derated action setting value of the invalid protection device and the minimum short-circuit current;

[0018] When the sensitivity requirement is satisfied, the sensitivity adaptation value of the corresponding transfer candidate line is determined to be a second preset value, wherein the second preset value is less than the first preset value;

[0019] When the sensitivity requirement is judged to be unsatisfied, the sensitivity adaptation value of the corresponding transfer candidate line is determined to be 0.

[0020] Optionally, the operating parameters include actual load power and rated power; the design parameters include the setting status of the secondary transfer line;

[0021] Determining the load rate adaptation value of the candidate transfer line according to the operating parameters of the fault line, the operating parameters of the candidate transfer line and the design parameters includes:

[0022] Calculate the load rate of the composite line after the transfer according to the actual load power of the fault line, the actual load power of the transfer alternative line and the rated power;

[0023] When the load rate of the composite line is within a healthy range, determining the load rate adaptation value of the transfer candidate line as a third preset value;

[0024] When the load rate of the composite line exceeds the upper limit of the healthy range but is within the safe range, the load rate adaptation value of the transfer candidate line is determined to be a fourth preset value, wherein the fourth preset value is less than the third preset value, and the safe range is higher than the healthy range;

[0025] When the load rate of the composite line exceeds the upper limit of the safety range, the load rate adaptation value corresponding to the transfer candidate line is determined in combination with the load rate of the composite line and the setting status of the secondary transfer line.

[0026] Optionally, the combining the load rate of the composite line and the setting state of the secondary transfer line to determine the load rate adaptation value corresponding to the transfer candidate line includes:

[0027] According to the load rate of the composite line and the setting state of the secondary transfer line in the transfer candidate line, judging whether the transfer candidate line can reduce the load rate of the composite line to below the upper limit of the safety range through secondary transfer;

[0028] In the case that the transfer candidate line cannot reduce the load rate of the composite line to below the upper limit of the safety range through secondary transfer, the load rate adaptation value of the transfer candidate line is determined to be 0;

[0029] In the case where the alternative transfer line can reduce the load rate of the composite line to below the upper limit of the safety range through secondary transfer, the load rate adaptation value of the alternative transfer line is determined according to the number of secondary transfers, wherein the load rate adaptation value of the alternative transfer line is negatively correlated with the number of secondary transfers.

[0030] Optionally, determining the load rate adaptation value of the candidate transfer line according to the number of secondary transfers includes:

[0031] In the case that the transfer alternative line can reduce the load rate of the composite line to below the upper limit of the safety range through secondary transfer, the number of secondary transfers and the fourth preset value are substituted into y=1 / ((n+1))*m to calculate the load rate adaptation value of the transfer alternative line, wherein y is the load rate adaptation value of the transfer alternative line, n is the number of secondary transfers, and m is the fourth preset value.

[0032] Optionally, the historical fault data includes operation time and number of historical faults;

[0033] Determining the reliability index of the candidate transfer line according to the historical fault data of the candidate transfer line includes:

[0034] Calculate the average number of failures per unit time of the alternate transfer route according to the operating time and the number of historical failures;

[0035] The reliability index of the alternative transfer line is determined according to the number interval in which the average number of failures is located, wherein different number intervals correspond to different reliability indexes.

[0036] Optionally, the larger the lower limit value of the number interval is, the smaller the corresponding reliability index is.

[0037] Optionally, the determining the adaptability of the supply transfer candidate line relative to the faulty line by combining the corresponding sensitivity adaptation value, the load rate adaptation value and the reliability index comprises:

[0038] When the corresponding sensitivity adaptation value, load rate adaptation value and reliability index have a zero value, determining the transfer adaptability of the transfer candidate line relative to the fault line to be 0;

[0039] When the corresponding sensitivity adaptation value, load rate adaptation value and reliability index do not have a zero value, the transfer adaptability of the transfer alternative line relative to the faulty line is determined by combining the sensitivity adaptation value, the load rate adaptation value and the reliability index, and their corresponding importance levels.

[0040] Optionally, the combining the sensitivity adaptation value, the load rate adaptation value and the reliability index, and their corresponding importance levels, to determine the adaptability of the alternative transfer line relative to the faulty line includes:

[0041] In the case that the corresponding sensitivity adaptation value, load rate adaptation value and reliability index do not have a zero value, the sensitivity adaptation value, the load rate adaptation value and the reliability index, and their corresponding proportional coefficients, are substituted into the formula f=x*r1+y*r2+z*r3 to calculate the transfer adaptability of the transfer alternative line relative to the fault line;

[0042] Among them, f is the transfer adaptability of the alternative transfer line relative to the faulty line, x is the sensitivity adaptation value of the alternative transfer line, r1 is the proportional coefficient of the sensitivity adaptation value, y is the load rate adaptation value of the alternative transfer line, r2 is the proportional coefficient of the load rate adaptation value, z is the reliability index of the alternative transfer line, and r3 is the proportional coefficient of the reliability index.

[0043] According to another aspect of the present invention, a power distribution line transfer device is provided, and the power distribution line transfer device includes a sensitivity adaptation value determination module, a load rate adaptation value determination module, a reliability index determination module, a transfer adaptability determination module and a route determination module. The sensitivity adaptation value determination module is used to determine the sensitivity adaptation value of the transfer alternative line according to the design parameters of the fault line and the transfer alternative line. The load rate adaptation value determination module is used to determine the load rate adaptation value of the transfer alternative line according to the operating parameters of the fault line, the operating parameters of the transfer alternative line and the design parameters. The reliability index determination module is used to determine the reliability index of the transfer alternative line according to the historical fault data of the transfer alternative line. The transfer adaptability determination module is used to determine the transfer adaptability of the transfer alternative line relative to the fault line in combination with the corresponding sensitivity adaptation value, the load rate adaptation value and the reliability index. The route determination module is used to determine the transfer target line from the transfer alternative lines based on the transfer adaptability.

[0044] The power distribution line transfer method and device provided in this embodiment determine the sensitivity adaptation value of the transfer alternative line according to the design parameters of the fault line and the transfer alternative line. Determine the load rate adaptation value of the transfer alternative line according to the operating parameters of the fault line, as well as the operating parameters and design parameters of the transfer alternative line. Determine the reliability index of the transfer alternative line based on the historical fault data of the transfer alternative line. Determine the transfer adaptability of the transfer alternative line relative to the fault line in combination with the corresponding sensitivity adaptation value, load rate adaptation value and reliability index. Based on the transfer adaptability, determine the transfer target line from the transfer alternative lines, realize the selection of the transfer line, and analyze the transfer capacity of each transfer alternative line in combination with sensitivity, load rate and reliability, thereby improving the transfer speed and reliability.

[0045] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0047] Figure 1 A schematic diagram of a flow chart of a power distribution line power transfer method provided in an embodiment of the present invention;

[0048] Figure 2A schematic diagram of a flow chart of a method for determining a load rate adaptation value provided by an embodiment of the present invention;

[0049] Figure 3 A schematic diagram of a power distribution line machine and its alternate power supply lines provided in an embodiment of the present invention;

[0050] Figure 4 A schematic diagram of a flow chart of a method for determining a load rate adaptation value provided by an embodiment of the present invention;

[0051] Figure 5 A schematic flow chart of another method for determining a load rate adaptation value provided by an embodiment of the present invention;

[0052] Figure 6 A schematic diagram of a flow chart of a reliability index determination method provided by an embodiment of the present invention;

[0053] Figure 7 A schematic flow chart of another power distribution line power transfer method provided in an embodiment of the present invention;

[0054] Figure 8 A schematic diagram of the composition of a power transfer device for a distribution line provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0055] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0056] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0057] In order to solve the problem mentioned in the background technology, an embodiment of the present invention provides a power transfer method for a distribution line. Figure 1A schematic diagram of a flow chart of a power distribution line transfer method provided in an embodiment of the present invention, referring to Figure 1 , the power distribution line transfer method includes:

[0058] S101. Determine the sensitivity adaptation value of the alternative transfer line according to the design parameters of the faulty line and the alternative transfer line.

[0059] Specifically, the alternative transfer line refers to a related line that can transfer power to a faulty line, and the number of alternative transfer lines corresponding to the faulty line is greater than 1. Exemplarily, the alternative transfer line can be an adjacent line connected to the faulty line via a ring network switch, and the connection between the alternative transfer line and the faulty line does not pass through distribution lines in other substations.

[0060] Design parameters refer to basic parameters determined during the design process of a line, which may include conductor parameters and connection relationship parameters. For example, the design parameters may include conductor parameters such as conductor model and conductor length, and may also include connection relationship parameters such as adjacent line settings.

[0061] The sensitivity adaptation value of the transfer alternative line refers to the capability value of the scheme of using the transfer alternative line to supply power to the fault circuit in terms of fault cut-out sensitivity, which can characterize the ability of the composite line formed by combining the two lines when the transfer alternative line is used to transfer power to the fault line, in terms of detecting and cutting off the fault. For example, the higher the sensitivity adaptation value of the transfer alternative line, the faster and more accurate the response speed to the fault cut-out during operation of the scheme of using the transfer alternative line to supply power to the fault circuit.

[0062] According to the conductor parameters of the fault line and the transfer alternative line, the sensitivity-related parameters of the composite line corresponding to the transfer alternative line can be calculated. For example, the sensitivity-related parameters can be the minimum value of the two-phase short-circuit current at the end of the line under the minimum operation mode of the system. The sensitivity-related parameters are compared with the corresponding target thresholds, and the sensitivity adaptation value of the transfer alternative line can be determined according to the comparison results.

[0063] Exemplarily, based on the line length and line model of the fault line and the transfer line, the minimum value of the two-phase short-circuit current at the end of the composite line under the system minimum operating mode can be calculated. The minimum value of the two-phase short-circuit current is compared with the action setting of the quick-break protection device in the composite line. If the minimum value of the two-phase short-circuit current does not exceed the action setting of the quick-break protection device in the composite line, it indicates that the sensitivity of the line is poor, and the sensitivity adaptation value can be determined to be a smaller value. If the minimum value of the two-phase short-circuit current exceeds the action setting of the quick-break protection device in the composite line, it indicates that the sensitivity of the composite line is good, and the sensitivity adaptation value can be determined to be a larger value.

[0064] S102. Determine a load rate adaptation value of the alternative transfer line according to the operating parameters of the faulty line and the operating parameters and design parameters of the alternative transfer line.

[0065] Specifically, the operating parameters refer to the state parameters of the corresponding line during operation, and exemplarily, the operating parameters may include load current and / or load power. The design parameters may include connection relationship parameters and capacity parameters, and exemplarily, the design parameters may include connection relationship parameters such as the setting of adjacent lines, and may also include load capacity parameters such as rated power and rated current.

[0066] The load rate adaptation value of the transfer alternative line refers to the load-bearing capacity value of the scheme of using the transfer alternative line to supply power to the faulty circuit, which can characterize the load-bearing capacity of the composite line formed by combining the two lines when the transfer alternative line is used to transfer power to the faulty circuit. For example, the higher the load rate adaptation value of the transfer alternative line, the stronger the load throughput capacity of the scheme of using the transfer alternative line to supply power to the faulty circuit during operation.

[0067] According to the operating parameters of the fault line and the transfer alternative line, the load rate related parameters of the composite line corresponding to the transfer alternative line can be calculated. Exemplarily, the load rate related coefficient may include the load rate. When the load rate related coefficient is within the safe operation range, the load rate adaptation value of the corresponding transfer alternative line is determined according to the load rate related coefficient. When the load rate related coefficient is not within the safe operation range, the load rate adaptation value of the corresponding transfer alternative line is determined in combination with the load rate related coefficient and the setting of the adjacent lines of the transfer alternative line.

[0068] Exemplarily, the load rate of the composite line is calculated according to the actual load power of the fault line, the actual load of the transfer alternative line and the rated power of the transfer alternative line. When the load rate is within the safe operation range, the load rate adaptation value of the transfer alternative line is determined according to the load rate, wherein the higher the load rate, the lower the corresponding load rate adaptation value. When the load rate is not within the safe operation range, according to the setting of the adjacent lines of the transfer alternative line, it is judged whether the transfer alternative line can reduce the load rate of the composite line to the safe operation range through secondary transfer, and then the number of secondary transfers is determined. According to the judgment result and the number of secondary transfers, the load rate adaptation value of the transfer alternative line is correspondingly determined. In the case where secondary transfer cannot be performed, the load rate adaptation value of the transfer alternative line is 0. In the case where secondary transfer can be performed, the more times of secondary transfer are required, the lower the load rate adaptation value of the transfer alternative line.

[0069] S103. Determine a reliability index of the candidate transfer line according to historical fault data of the candidate transfer line.

[0070] Specifically, the reliability index of the alternative transfer line refers to the quantitative value of the reliability of the alternative line in the historical operation process. According to the historical fault data, the frequency of historical faults of the alternative transfer line can be determined. The frequency of historical faults can reversely characterize the reliability of the alternative transfer line, and then determine the reliability index of the alternative transfer line. Exemplarily, the more the number of historical faults, the smaller the reliability index of the alternative transfer line can be determined.

[0071] S104. Determine the adaptability of the alternative power supply line relative to the faulty line by combining the corresponding sensitivity adaptation value, load rate adaptation value and reliability index.

[0072] Specifically, a comprehensive analysis is performed on the sensitivity adaptation value, load rate adaptation value and reliability index corresponding to the alternative transfer line to determine the transfer adaptability of the alternative transfer line relative to the fault line. Exemplarily, the transfer adaptability of the alternative transfer line relative to the fault line is calculated by accumulating or weighted accumulating the sensitivity adaptation value, load rate adaptation value and reliability index corresponding to the alternative transfer line.

[0073] S105. Based on the transfer adaptability, determine the transfer target line from the transfer candidate lines.

[0074] Specifically, the target transfer line refers to the target line for transferring power to the faulty line. All the candidate transfer lines for the faulty line are sorted according to the transfer adaptability. The candidate transfer line with the highest transfer adaptability is determined as the target transfer line for the faulty line, and the faulty line is transferred.

[0075] The power distribution line transfer method provided in this embodiment determines the sensitivity adaptation value of the transfer alternative line according to the design parameters of the fault line and the transfer alternative line. The load rate adaptation value of the transfer alternative line is determined according to the operating parameters of the fault line, as well as the operating parameters and design parameters of the transfer alternative line. The reliability index of the transfer alternative line is determined according to the historical fault data of the transfer alternative line. The transfer adaptability of the transfer alternative line relative to the fault line is determined in combination with the corresponding sensitivity adaptation value, load rate adaptation value and reliability index. Based on the transfer adaptability, the transfer target line is determined from the transfer alternative lines, the selection of the transfer line is realized, and the transfer capacity of each transfer alternative line is analyzed in combination with sensitivity, load rate and reliability, thereby improving the transfer speed and reliability.

[0076] Figure 2 A flow chart of a method for determining a load rate adaptation value provided by an embodiment of the present invention is provided. Figure 2 The load rate adaptation value determination method shown can be used as Figure 1 Another embodiment of step S101 in the scheme, based on the above embodiment, refers to Figure 2, the method for determining the load rate adaptation value includes:

[0077] S201. Calculate the minimum short-circuit current at the end of the composite line after the transfer according to the line type and line length of the fault line and the transfer alternative line.

[0078] Specifically, the minimum short-circuit current at the end of the composite line refers to the minimum value of the two-phase short-circuit current at the end of the composite line under the minimum operating mode of the system. According to the line type and line length of the fault line and the transfer alternative line, the maximum short-circuit impedance of the composite line corresponding to the transfer alternative line can be calculated. The maximum short-circuit impedance of the line and the maximum short-circuit impedance of the system can be summed to determine the maximum short-circuit impedance of the composite line corresponding to the transfer alternative line. Combined with the system voltage and the maximum short-circuit impedance, the minimum short-circuit current at the end of the composite line after the transfer can be calculated.

[0079] S202: Determine whether all protection devices in the composite circuit are effective according to the minimum short-circuit current and the action setting of the protection device.

[0080] Specifically, the action setting of the protection device refers to the current threshold corresponding to the short-circuit quick-break of the protection device. Once the short-circuit current in the line exceeds the action setting, the protection device will act to cut out the fault. Exemplarily, the protection device may include a ring network switch or all switches on a composite line. The ratio of the minimum short-circuit current at the end of the composite line to the system sensitivity coefficient is compared with the action setting of the protection device. If the comparison result is not less than, then it indicates that a short circuit at any point on the composite line will trigger the action of the corresponding protection device. In this case, it can be determined that the protection device is effective. If the comparison result is less than, it indicates that a short circuit at the end of the composite line may not cause the action of the protection device, then it can be determined that the protection device is invalid. Sampling is used to separately judge all protection devices on the composite line, so as to achieve separate effectiveness judgments on all protection devices in the composite line.

[0081] S203: When all protection devices in the composite line are effective, determine that the sensitivity adaptation value of the corresponding transfer candidate line is a first preset value.

[0082] Specifically, if all protection devices in the composite line are effective, it means that no matter where a short circuit fault occurs in the composite line, the nearest protection device will be triggered to operate, and assuming that the nearest protection device fails due to a fault in subsequent operation, the upper layer or even further protection devices will still operate to remove the fault. In this case, the sensitivity adaptation value of the transfer alternative line can be determined to be the first preset value, and the first preset value is the maximum value of the sensitivity adaptation value. For example, the first preset value can be 100.

[0083] S204. When a protection device in the composite line is invalid, determine whether the composite line meets the sensitivity requirement according to the derating action setting and the minimum short-circuit current of the invalid protection device.

[0084] Specifically, if there is an invalid protection device in the composite circuit, it means that there is a protection device in the composite circuit that does not take action on the short-circuit fault at the end of the composite circuit. In this case, the invalid protection device can be modified by de-rating the action setting, wherein the action setting after de-rating is called the de-rated action setting. Since the modification range of the action setting of the protection device is limited, the de-rating modification of the action setting needs to be within a preset range. The de-rated action setting of the protection device is determined in accordance with the preset range, and then the sensitivity coefficient of the invalid protection device is calculated based on the de-rated action setting combined with the minimum short-circuit current. When the sensitivity coefficients of all invalid protection devices meet the sensitivity coefficient of the system, it can be determined that the composite circuit meets the sensitivity requirement. For example, the sensitivity coefficient requirement can be greater than 1.3. When the sensitivity coefficient of the invalid protection device still does not meet the sensitivity coefficient requirement of the system, it can be determined that the composite circuit does not meet the sensitivity requirement.

[0085] S205. When the sensitivity requirement is determined to be satisfied, determine the sensitivity adaptation value of the corresponding transfer candidate line to be a second preset value.

[0086] Specifically, if the sensitivity requirement is satisfied, it indicates that the derating modification implemented on the action setting of the protection device makes all the protection devices in the composite line effective, and the sensitivity of the composite line after the derating modification meets the system requirements. In this case, the sensitivity adaptation value of the corresponding transfer alternative line can be determined to be a second preset value, wherein the second preset value is less than the first preset value. For example, when the first preset value is 100, the second preset value can be 80.

[0087] S206. When the sensitivity requirement is judged to be unsatisfied, determine the sensitivity adaptation value of the corresponding transfer candidate line to be 0.

[0088] Specifically, if the sensitivity requirement is not met, it means that the derating modification implemented on the action setting of the protection device makes the sensitivity of the line no longer meet the system requirements, that is, the derating modification plan cannot be implemented. In this case, it can be determined that the sensitivity adaptation value of the corresponding transfer alternative line is 0, indicating that the sensitivity of the transfer alternative line cannot be guaranteed after transferring power to the faulty line.

[0089] For example, Figure 3 A schematic diagram of a power distribution line machine and its alternate power supply line provided by an embodiment of the present invention, referring to Figure 3, assume that a fault occurs between switch KA1 and switch KA2.

[0090] At this time, if the ring network switch K1 is closed, the B line will be used to transfer power to the A line. The main line of the B line uses a 300mm overhead line with a length of 8 kilometers. The A line uses a 300mm cable line with a length of 10 kilometers. Now calculate the sensitivity adaptation value of the B line. First, according to the line type and line length of the A line and the B line, the maximum short-circuit impedance at the end of the AB composite line is calculated to be 6.35Ω. Then, the maximum short-circuit impedance is combined with the system voltage to calculate the minimum short-circuit current at the end of the AB composite line to be about 826A. According to the minimum short-circuit current and the action setting of the protection device, it is judged whether each protection device is effective. Taking the protection device as the ring network switch K1 as an example, the setting of the ring network switch K1 is 2700A in the first section and 630A in the second section. Since the ratio of the minimum short-circuit current 826A to the system sensitivity coefficient 1.3 is 635.38A, which is greater than the two-end setting 630A, it can be determined that the ring network switch K1 is effective. When it is determined that other protection devices in the AB composite line are also effective, the sensitivity adaptation value of the B line is determined to be a maximum value of 100.

[0091] At this time, if the ring network switch K2 is closed, the C line will be used to transfer power to the A fault line. The main line of the C line uses a 240mm overhead line with a length of 30 kilometers. The A line uses a 300mm cable line with a length of 10 kilometers. Now calculate the sensitivity adaptation value of the C line. First, according to the line type and line length of the A line and the C line, the maximum short-circuit impedance at the end of the AC composite line is calculated to be 13.98Ω. Then, the maximum short-circuit impedance is combined with the system voltage to calculate the minimum short-circuit current at the end of the AC composite line to be approximately 375A. According to the minimum short-circuit current and the action setting value of the protection device, it is judged whether each protection device is effective. Taking the protection device as the ring network switch K2 as an example, the setting value of the ring network switch K2 is 2700A in the first section and 630A in the second section. Since the ratio of the minimum short-circuit current 375A to the system sensitivity coefficient 1.3 is 288.46A, which is less than the two-terminal set value 630A, it can be determined that the ring network switch K2 is invalid, and the sensitivity adaptation value of the C line cannot be determined as the maximum value of 100. In this case, it is necessary to modify the set value of the ring network switch K2 (and other invalid protection devices) to reduce the rating, and further determine whether the AC composite line meets the sensitivity requirements after the set value modification. If it does, the sensitivity adaptation value of the C line is determined to be 80, otherwise the sensitivity adaptation value of the C line is 0.

[0092] At this time, if the ring network switch K3 is closed, the D line will be used to transfer power to the A line. The main line of the D line uses a 300mm overhead line with a length of 5 kilometers. The A line uses a 300mm cable line with a length of 10 kilometers. Now calculate the sensitivity adaptation value of the D line. First, according to the line type and line length of the A line and the D line, the maximum short-circuit impedance at the end of the AD composite line is calculated to be 5.38Ω. Then, the maximum short-circuit impedance is combined with the system voltage to calculate the minimum short-circuit current at the end of the AD composite line to be about 976A. According to the minimum short-circuit current and the action setting of the protection device, it is judged whether each protection device is effective. Taking the protection device as the ring network switch K3 as an example, the setting of the ring network switch K3 is 2700A in the first section and 630A in the second section. Since the ratio of the minimum short-circuit current 976A to the system sensitivity coefficient 1.3 is 750.7A, which is greater than the two-end setting 630A, it can be determined that the ring network switch K3 is effective. When it is determined that other protection devices in the AD composite line are also effective, the sensitivity adaptation value of the D line is determined to be a maximum value of 100.

[0093] The power transfer method of the distribution line provided in this embodiment calculates the minimum short-circuit current at the end of the composite line after the transfer according to the line type and line length of the fault line and the transfer alternative line. According to the minimum short-circuit current and the action setting value of the protection device, it is judged whether each protection device in the composite line is effective. When each protection device in the composite line is effective, the sensitivity adaptation value of the corresponding transfer alternative line is determined to be a first preset value. When there is an invalid protection device in the composite line, it is judged whether the composite line meets the sensitivity requirement according to the derated action setting value and the minimum short-circuit current of the invalid protection device. When the judgment result of the sensitivity requirement is satisfied, the sensitivity adaptation value of the corresponding transfer alternative line is determined to be a second preset value, wherein the second preset value is less than the first preset value. When the judgment result of the sensitivity requirement is not satisfied, the sensitivity adaptation value of the corresponding transfer alternative line is determined to be 0, so as to realize the quantification of the sensitivity of the composite line corresponding to the transfer alternative line, ensure the sensitivity of the transfer scheme, and improve the reliability of the distribution line after the transfer.

[0094] Figure 4 A flow chart of a method for determining a load rate adaptation value provided by an embodiment of the present invention is provided. Figure 4 The load rate adaptation value determination method shown can be used as Figure 1 Another embodiment of step S102 in the scheme, refer to Figure 4 , the load rate adaptation value determination method includes:

[0095] S401. Calculate the load rate of the composite line after the transfer according to the actual load power of the faulty line, the actual load power and the rated power of the transfer alternative line.

[0096] Specifically, the actual load power of the faulty line and the actual load power of the transfer alternative line are accumulated to determine the actual load power of the composite line formed by transferring power to the faulty line using the transfer alternative line. The load rate of the composite line after transfer can be calculated by combining the ratio of the actual load power of the composite line and the rated power of the transfer alternative line.

[0097] S402: When the load rate of the composite line is within a healthy range, the load rate adaptation value of the transfer candidate line is determined to be a third preset value.

[0098] Specifically, the healthy range refers to the load rate range that can ensure the healthy operation of the distribution line. If the load rate of the composite line is in the healthy range, it means that the composite line still has a large power margin under the current load condition, and the load rate adaptation value of the composite line corresponding to the transfer alternative line can be determined as the maximum value, that is, the third preset value. Exemplarily, the healthy range can be 0% to 50%, and the third preset value can be equal to 100.

[0099] S403: When the load rate of the composite line exceeds the upper limit of the healthy range but is within the safe range, the load rate adaptation value of the transfer alternative line is determined to be a fourth preset value.

[0100] Specifically, the safety range refers to the load rate range that can ensure the safe operation of the distribution line. If the load rate of the composite line is within the safety range, it means that the composite line can still operate safely even though it does not have a large power margin under the current load condition. The load rate adaptation value of the composite line corresponding to the transfer alternative line can be determined as a fourth preset value, wherein the fourth preset value is less than the third preset value, and the safety range is higher than the health range; illustratively, the safety range can be (50%, 100%] or (50%, 120%], and the fourth preset value can be equal to 80.

[0101] S404. When the load rate of the composite line exceeds the upper limit of the safety range, the load rate adaptation value of the corresponding transfer candidate line is determined in combination with the load rate of the composite line and the setting status of the secondary transfer line.

[0102] Specifically, if the load rate exceeds the upper limit of the safety range, it means that the composite line will be overloaded. In this case, it is determined whether there is a line (that is, a secondary transfer line) that can provide secondary transfer for the transfer candidate line corresponding to the composite line. According to the existence of the secondary transfer line, the load rate adaptation value of the corresponding transfer candidate line is determined accordingly.

[0103] For example, Figure 5 A flow chart of another method for determining a load rate adaptation value provided by an embodiment of the present invention, referring to Figure 5, in the case where the load rate of the composite line exceeds the upper limit of the safety range, the load rate adaptation value of the transfer alternative line can also be determined by the following steps, which may include: S4041. According to the load rate of the composite line and the setting status of the secondary transfer line in the transfer alternative line, it is judged whether the transfer alternative line can reduce the load rate of the composite line to below the upper limit of the safety range through secondary transfer. S4042. In the case where the transfer alternative line cannot reduce the load rate of the composite line to below the upper limit of the safety range through secondary transfer, the load rate adaptation value of the transfer alternative line is determined to be 0. S4043. In the case where the transfer alternative line can reduce the load rate of the composite line to below the upper limit of the safety range through secondary transfer, the load rate adaptation value of the transfer alternative line is determined according to the number of secondary transfers. Among them, the load rate adaptation value of the transfer alternative line is negatively correlated with the number of secondary transfers. For example, when the transfer alternative line can reduce the load rate of the composite line to below the upper limit of the safety range through secondary transfer, the number of secondary transfers and the fourth preset value can be substituted into y=1 / ((n+1))*m to calculate the load rate adaptation value of the transfer alternative line, where y is the load rate adaptation value of the transfer alternative line, n is the number of secondary transfers, and m is the fourth preset value.

[0104] For example, in combination Figure 3 and Figure 5 , if the ring network switch K1 is closed, the B line is used to transfer power to the A line. If the load rate of the AB composite line formed by using the B line to transfer power to the A line is calculated to be 134%, then the ring network switch K4 can be used to transfer part of the load on the line to the E line, and the load rate of the AB composite line after the transfer is 89% and is less than the upper limit 120 of the safety range (50,120]. Since the number of secondary transfers n is 1, the fourth preset value m is equal to 80, so the load rate adaptation value of the B line is determined to be equal to 1 / ((n+1))*m=1 / ((1+1))*80=40.

[0105] If the ring network switch K3 is closed, the D line is used to transfer power to the A line. If the load rate of the AD composite line formed by using the D line to transfer power to the A line is calculated to be 81%, which exceeds the upper limit of the healthy range but is within the safe range, then it can be determined that the load rate adaptation value of the B line is equal to the fourth preset value 80.

[0106] The transfer method of the distribution line provided in this embodiment calculates the load rate of the composite line after transfer according to the actual load power of the faulty line, the actual load power and the rated power of the transfer alternative line. When the load rate of the composite line is within the healthy range, the load rate adaptation value of the transfer alternative line is determined as the third preset value. When the load rate of the composite line exceeds the upper limit of the healthy range but is within the safe range, the load rate adaptation value of the transfer alternative line is determined as the fourth preset value, wherein the fourth preset value is less than the third preset value, and the safe range is higher than the healthy range. When the load rate of the composite line exceeds the upper limit of the safe range, the load rate adaptation value of the corresponding transfer alternative line is determined in combination with the load rate of the composite line and the setting state of the secondary transfer line, thereby realizing the quantification of the load capacity of the composite line corresponding to the transfer alternative line, ensuring the load reliability of the transfer scheme, and further improving the reliability of the distribution line after transfer.

[0107] Figure 6 A flow chart of a reliability index determination method provided by an embodiment of the present invention is provided. Figure 6 The reliability index determination method shown can be used as Figure 1 Another embodiment of step S103 in the scheme, refer to Figure 5 , the reliability index determination method includes:

[0108] S601. Calculate the average number of failures per unit time of the alternative transfer route based on the operation time and the number of historical failures.

[0109] Specifically, the unit time can be equal to the minimum value of the maximum operating time corresponding to each transfer alternative line. For example, the length of time that line B has been in operation since the completion of installation is 5 years, the length of time that line C has been in operation since the completion of installation is 3 years, and the length of time that line D has been in operation since the completion of installation is 3 years. Then the minimum value of the maximum operating time corresponding to the three transfer alternative lines is 3 years, so the unit time can be set to 3 years. According to the ratio of the number of historical failures to the operating time, the average number of failures of the transfer alternative route in unit time can be calculated. For example, when the unit time is 3 years, the operating time of route B is 5 / 3 unit time. Assuming that the number of failures of route B after the start of operation is 5 times, the historical number of failures 5 is divided by the operating time 5 / 3, and it can be determined that the average number of failures of route B in unit time is 3 times.

[0110] S602. Determine the reliability index of the alternative supply line according to the interval of the average number of failures.

[0111] Specifically, different frequency intervals correspond to different reliability indexes. For example, the larger the lower limit of the frequency interval, the smaller the corresponding reliability index. The reliability index corresponding to the frequency interval [0,1] is 100, the reliability index corresponding to the frequency interval (1,4] is 80, the reliability index corresponding to the frequency interval (4,7] is 10, and the reliability index corresponding to the frequency interval (7,+∞] is 0. If the average number of failures per unit time of line B is 3 times, then the reliability index of line B can be determined to be 80.

[0112] The power transfer method of the distribution line provided in this embodiment calculates the average number of failures of the transfer alternative route per unit time according to the operation time and the number of historical failures. The reliability index of the transfer alternative route is determined according to the number interval in which the average number of failures is located, wherein different number intervals correspond to different reliability indexes, and the larger the lower limit value of the number interval, the smaller the corresponding reliability index, thereby realizing the quantification of the reliability of the transfer alternative route, ensuring the low failure rate of the transfer scheme, and further improving the reliability of the distribution line after the transfer.

[0113] Figure 7 A flow chart of another power distribution line transfer method provided by an embodiment of the present invention, referring to Figure 7 , the power distribution line transfer method includes:

[0114] S701. Calculate the minimum short-circuit current at the end of the composite line after the transfer according to the line type and line length of the fault line and the transfer alternative line.

[0115] S702: Determine whether all protection devices in the composite circuit are effective according to the minimum short-circuit current and the action setting of the protection device.

[0116] S703: When all protection devices in the composite line are effective, determine that the sensitivity adaptation value of the corresponding transfer candidate line is a first preset value.

[0117] S704. When a protection device in the composite line is invalid, determine whether the composite line meets the sensitivity requirement according to the derating action setting and the minimum short-circuit current of the invalid protection device.

[0118] S705: When the sensitivity requirement is determined to be satisfied, determine the sensitivity adaptation value of the corresponding transfer candidate line to be a second preset value.

[0119] S706: When the sensitivity requirement is judged to be unsatisfied, determine the sensitivity adaptation value of the corresponding transfer candidate line to be 0.

[0120] Steps S701, S702, S703, S704, S705 and S706 correspond one-to-one to steps S201, S202, S203, S204, S205 and S206 in the aforementioned embodiment respectively and have the same contents, and will not be described in detail here.

[0121] S707. Calculate the load rate of the composite line after the transfer according to the actual load power of the faulty line, the actual load power and the rated power of the transfer alternative line.

[0122] S708. When the load rate of the composite line is within a healthy range, the load rate adaptation value of the transfer candidate line is determined to be a third preset value.

[0123] S709: When the load rate of the composite line exceeds the upper limit of the healthy range but is within the safe range, the load rate adaptation value of the transfer alternative line is determined to be a fourth preset value.

[0124] S710. When the load rate of the composite line exceeds the upper limit of the safety range, determine the load rate adaptation value of the corresponding transfer candidate line in combination with the load rate of the composite line and the setting status of the secondary transfer line.

[0125] Steps S707, S708, S708 and S710 correspond to steps S401, S402, S403 and S404 in the aforementioned embodiment respectively and have the same contents, and will not be described in detail here.

[0126] S711. Calculate the average number of failures per unit time of the alternative transfer route based on the operating time and the number of historical failures.

[0127] S712. Determine the reliability index of the alternative supply line according to the interval of the average number of failures.

[0128] Steps S711 and S712 correspond to steps S601 and S602 in the aforementioned embodiment respectively and have the same contents, and will not be described in detail here.

[0129] S713: When the corresponding sensitivity adaptation value, load rate adaptation value and reliability index have zero values, the transfer adaptability of the alternative transfer line relative to the faulty line is determined to be 0.

[0130] Specifically, if the sensitivity adaptation value, load rate adaptation value and reliability index have zero values, it means that at least one of the three is unqualified. For example, if the sensitivity adaptation value is 0, it means that the fault cut-out sensitivity of the scheme in which the transfer candidate line transfers power to the faulty line is unqualified. If at least one of the three is 0, the transfer adaptability of the transfer candidate line relative to the faulty line can be directly determined to be 0, and the transfer candidate line is no longer considered.

[0131] S714. When the corresponding sensitivity adaptation value, load rate adaptation value and reliability index do not have a zero value, the adaptability of the alternative transfer line relative to the faulty line is determined by combining the sensitivity adaptation value, load rate adaptation value and reliability index and their corresponding importance levels.

[0132] Specifically, the importance can be reflected by a proportional coefficient. For example, the sensitivity adaptation value, the load rate adaptation value and the reliability index can have corresponding proportional coefficients of 40%, 40% and 20%, respectively, which reflects that the importance of the sensitivity adaptation value and the load rate adaptation value is higher than the reliability index. For example, when the corresponding sensitivity adaptation value, the load rate adaptation value and the reliability index do not have a zero value, the sensitivity adaptation value, the load rate adaptation value and the reliability index, and their corresponding proportional coefficients, are substituted into the formula f=x*r1+y*r2+z*r3 to calculate the transfer adaptability of the transfer alternative line relative to the fault line. Among them, f is the transfer adaptability of the transfer alternative line relative to the fault line, x is the sensitivity adaptation value of the transfer alternative line, r1 is the proportional coefficient of the sensitivity adaptation value, y is the load rate adaptation value of the transfer alternative line, r2 is the proportional coefficient of the load rate adaptation value, z is the reliability index of the transfer alternative line, and r3 is the proportional coefficient of the reliability index. .

[0133] Exemplarily, when the sensitivity adaptation value, load rate adaptation value and reliability index respectively correspond to proportional coefficients of 40%, 40% and 20%, if the sensitivity adaptation value x of the transfer alternative line B of the faulty line A is 80, the load rate adaptation value is 80 and the reliability index is 80, then the transfer adaptability of the transfer alternative line B relative to the faulty line A is f=80*40%+80*40%+80*20%=80. If the sensitivity adaptation value x of the transfer alternative line C of the faulty line A is 100, the load rate adaptation value is 40 and the reliability index is 80, then the transfer adaptability of the transfer alternative line C relative to the faulty line A is f=100*40%+40*40%+80*20%=72. If the sensitivity adaptation value x of the transfer alternative line D of the faulty line A is 100, the load rate adaptation value is 80 and the reliability index is 80, then the transfer adaptability of the transfer alternative line D relative to the faulty line A is f=100*40%+80*40%+80*20%=88.

[0134] S715. Based on the transfer adaptability, determine the transfer target line from the transfer candidate lines.

[0135] Specifically, all the transfer alternative lines of the faulty line are sorted according to the transfer adaptability. The transfer alternative line with the highest transfer adaptability is determined as the transfer target line of the faulty line, and the faulty line is transferred. Exemplarily, when the transfer adaptability corresponding to the three transfer alternative lines B, C, and D are 80, 72, and 88, respectively, the transfer alternative line C with the highest transfer adaptability is determined as the transfer target line.

[0136] The power distribution line transfer method provided in this embodiment determines the sensitivity adaptation value of the transfer alternative line according to the design parameters of the fault line and the transfer alternative line. The load rate adaptation value of the transfer alternative line is determined according to the operating parameters of the fault line, as well as the operating parameters and design parameters of the transfer alternative line. The reliability index of the transfer alternative line is determined according to the historical fault data of the transfer alternative line. The transfer adaptability of the transfer alternative line relative to the fault line is determined in combination with the corresponding sensitivity adaptation value, load rate adaptation value and reliability index. Based on the transfer adaptability, the transfer target line is determined from the transfer alternative lines, the selection of the transfer line is realized, and the transfer capacity of each transfer alternative line is analyzed in combination with sensitivity, load rate and reliability, thereby improving the transfer speed and reliability.

[0137] An embodiment of the present invention also provides a power transfer device for a power distribution line. Figure 8 A schematic diagram of a power distribution line transfer device provided in an embodiment of the present invention, referring to Figure 8 , the transfer device 800 of the distribution line includes a sensitivity adaptation value determination module 801, a load rate adaptation value determination module 802, a reliability index determination module 803, a transfer adaptability determination module 804 and a route determination module 805. The sensitivity adaptation value determination module 801 is used to determine the sensitivity adaptation value of the transfer alternative line according to the design parameters of the fault line and the transfer alternative line. The load rate adaptation value determination module 802 is used to determine the load rate adaptation value of the transfer alternative line according to the operating parameters of the fault line, and the operating parameters and design parameters of the transfer alternative line. The reliability index determination module 803 is used to determine the reliability index of the transfer alternative line according to the historical fault data of the transfer alternative line. The transfer adaptability determination module 804 is used to determine the transfer adaptability of the transfer alternative line relative to the fault line in combination with the corresponding sensitivity adaptation value, load rate adaptation value and reliability index. The route determination module 805 is used to determine the transfer target line from the transfer alternative lines based on the transfer adaptability.

[0138] The power distribution line transfer device provided in the embodiment of the present invention can execute the power distribution line transfer method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0139] 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 described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0140] The above specific implementations do not constitute a limitation on the protection scope of the present invention. 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 invention should be included in the protection scope of the present invention.

Claims

1. A method for transferring power supply of a distribution line, characterized in that: include: Determining the sensitivity adaptation value of the alternative transfer line according to the design parameters of the fault line and the alternative transfer line; Determining a load rate adaptation value of the alternate transfer line according to the operating parameters of the fault line, the operating parameters of the alternate transfer line and the design parameters; Determining a reliability index of the alternative power transfer line according to historical fault data of the alternative power transfer line; Determine the adaptability of the alternate power transfer line relative to the fault line by combining the corresponding sensitivity adaptation value, the load rate adaptation value and the reliability index; Based on the transfer adaptability, a transfer target line is determined from the transfer candidate lines.

2. The method according to claim 1, characterized in that The design parameters include line type, line length and action setting value of protection device; The step of determining the sensitivity adaptation value of the alternate power transfer line according to the design parameters of the faulty line and the alternate power transfer line comprises: Calculate the minimum short-circuit current at the end of the composite line after the transfer according to the line type and line length of the fault line and the transfer alternative line; According to the minimum short-circuit current and the action setting value of the protection device, judging whether each of the protection devices in the composite circuit is effective; When all the protection devices in the composite line are effective, determining the sensitivity adaptation value of the corresponding transfer candidate line to be a first preset value; In the case where the protection device in the composite circuit is invalid, judging whether the composite circuit meets the sensitivity requirement according to the derated action setting value of the invalid protection device and the minimum short-circuit current; When the sensitivity requirement is satisfied, the sensitivity adaptation value of the corresponding transfer candidate line is determined to be a second preset value, wherein the second preset value is less than the first preset value; When the sensitivity requirement is judged to be unsatisfied, the sensitivity adaptation value of the corresponding transfer candidate line is determined to be 0.

3. The method according to claim 1, characterized in that The operating parameters include actual load power and rated power; the design parameters include the setting status of the secondary transfer line; Determining the load rate adaptation value of the candidate transfer line according to the operating parameters of the fault line, the operating parameters of the candidate transfer line and the design parameters includes: Calculate the load rate of the composite line after the transfer according to the actual load power of the fault line, the actual load power of the transfer alternative line and the rated power; When the load rate of the composite line is within a healthy range, determining the load rate adaptation value of the transfer candidate line as a third preset value; When the load rate of the composite line exceeds the upper limit of the healthy range but is within the safe range, the load rate adaptation value of the transfer candidate line is determined to be a fourth preset value, wherein the fourth preset value is less than the third preset value, and the safe range is higher than the healthy range; When the load rate of the composite line exceeds the upper limit of the safety range, the load rate adaptation value corresponding to the transfer candidate line is determined in combination with the load rate of the composite line and the setting status of the secondary transfer line.

4. The method according to claim 3, characterized in that The step of combining the load rate of the composite line and the setting state of the secondary transfer line to determine the load rate adaptation value corresponding to the transfer candidate line includes: According to the load rate of the composite line and the setting state of the secondary transfer line in the transfer candidate line, judging whether the transfer candidate line can reduce the load rate of the composite line to below the upper limit of the safety range through secondary transfer; In the case that the transfer candidate line cannot reduce the load rate of the composite line to below the upper limit of the safety range through secondary transfer, the load rate adaptation value of the transfer candidate line is determined to be 0; In the case where the alternative transfer line can reduce the load rate of the composite line to below the upper limit of the safety range through secondary transfer, the load rate adaptation value of the alternative transfer line is determined according to the number of secondary transfers, wherein the load rate adaptation value of the alternative transfer line is negatively correlated with the number of secondary transfers.

5. The method according to claim 4, characterized in that The step of determining the load rate adaptation value of the candidate transfer line according to the number of secondary transfers includes: In the case where the transfer alternative line can reduce the load rate of the composite line to below the upper limit of the safety range through secondary transfer, the number of secondary transfers and the fourth preset value are substituted into The load rate adaptation value of the alternative transfer line is calculated, wherein y is the load rate adaptation value of the alternative transfer line, n is the number of secondary transfers, and m is the fourth preset value.

6. The method according to claim 1, characterized in that The historical fault data includes the operation time and the number of historical faults; Determining the reliability index of the candidate transfer line according to the historical fault data of the candidate transfer line includes: Calculate the average number of failures of the transfer alternative route per unit time according to the operation time and the number of historical failures; The reliability index of the alternative transfer line is determined according to the number interval in which the average number of failures is located, wherein different number intervals correspond to different reliability indexes.

7. The method according to claim 6, characterized in that The larger the lower limit value of the frequency interval is, the smaller the corresponding reliability index is.

8. The method according to any one of claims 1 to 7, characterized in that: The determining the adaptability of the supply transfer candidate line relative to the fault line by combining the corresponding sensitivity adaptation value, the load rate adaptation value and the reliability index comprises: When the corresponding sensitivity adaptation value, load rate adaptation value and reliability index have a zero value, determining the transfer adaptability of the transfer candidate line relative to the fault line to be 0; When the corresponding sensitivity adaptation value, load rate adaptation value and reliability index do not have a zero value, the transfer adaptability of the transfer alternative line relative to the faulty line is determined by combining the sensitivity adaptation value, the load rate adaptation value and the reliability index, and their corresponding importance levels.

9. The method according to claim 8, characterized in that The combining the sensitivity adaptation value, the load rate adaptation value and the reliability index, and their corresponding importance levels, to determine the adaptability of the alternative transfer line relative to the fault line includes: In the case that the corresponding sensitivity adaptation value, load rate adaptation value and reliability index do not have a zero value, the sensitivity adaptation value, the load rate adaptation value and the reliability index, and their corresponding proportional coefficients, are substituted into the formula f=x*r1+y*r2+z*r3 to calculate the transfer adaptability of the transfer alternative line relative to the fault line; Among them, f is the transfer adaptability of the alternative transfer line relative to the fault line, x is the sensitivity adaptation value of the alternative transfer line, r1 is the proportional coefficient of the sensitivity adaptation value, y is the load rate adaptation value of the alternative transfer line, r2 is the proportional coefficient of the load rate adaptation value, z is the reliability index of the alternative transfer line, and r3 is the proportional coefficient of the reliability index.

10. A power transfer device for a power distribution line, characterized in that: include: A sensitivity adaptation value determination module, used to determine the sensitivity adaptation value of the alternate transfer line according to the design parameters of the fault line and the alternate transfer line; A load rate adaptation value determination module, used to determine the load rate adaptation value of the candidate transfer line according to the operating parameters of the fault line, the operating parameters of the candidate transfer line and the design parameters; A reliability index determination module, used to determine the reliability index of the candidate transfer line according to the historical fault data of the candidate transfer line; A power transfer adaptability determination module, configured to determine the power transfer adaptability of the power transfer candidate line relative to the fault line in combination with the corresponding sensitivity adaptability value, the load rate adaptability value and the reliability index; A route determination module is used to determine a transfer target route from the transfer candidate routes based on the transfer adaptability.

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