Power transmission line mutual inductance live test system and method considering super capacitor energy storage

Abstract

The invention relates to the technical field of electric power engineering, in particular to a power transmission line mutual inductance live test system and method considering super capacitor energy storage. The system comprises a super capacitor energy storage power supply, a power failure line, an operation line and a controller. An isolation transformer is arranged between a power failure line and a running line, the power failure line is provided with a pilot frequency power supply and a first synchronous measurement unit, the running line is provided with a current-limiting resistor, a running line power supply, a second synchronous measurement unit and a third synchronous measurement unit, and a frequency converter is arranged in the pilot frequency power supply. The controller is electrically connected with the pilot-frequency power supply, the first synchronous measurement unit, the second synchronous measurement unit and the third synchronous measurement unit. The pilot-frequency power supply is connected with the super-capacitor energy storage power supply. The controller is used for executing the following operations; and determining the mutual inductance impedance of the double-circuit line based on the first data set and the second data set. Therefore, on the premise that the double-circuit line is not fully stopped, the mutual inductance impedance of the double-circuit line can be accurately measured.

Description

Technical Field

[0001] This invention relates to the field of power engineering technology, and in particular to a live testing system and method for mutual inductance of transmission lines that takes into account supercapacitor energy storage. Background Technology

[0002] Currently, the mainstream traditional method for measuring mutual inductance parameters of double-circuit power lines in the power industry still relies on a simultaneous complete power outage of both circuits. This method has several unavoidable problems: First, it causes huge economic and power losses; second, it increases the risk of power grid operation, as a complete power outage weakens the grid's redundancy capacity, and if other lines suddenly fail at the same time, it can easily trigger a chain reaction, leading to large-scale regional power outages; third, it has strong limitations, as in some areas with weak grid structures, power outage operations are extremely difficult, and may even be impossible due to power supply stability requirements, seriously affecting the timeliness of mutual inductance parameter updates.

[0003] In related technologies, early solutions such as the power frequency interference method and the zero-sequence incremental method have problems such as large signal interference and excessive parameter calculation errors. In addition, they require frequent operation of the circuit breaker, which increases equipment risk and interferes with power grid stability, making them unsuitable for large-scale promotion.

[0004] Based on this, the present invention proposes a live testing system and method for mutual inductance of transmission lines that considers supercapacitor energy storage to solve the problem of how to accurately measure the mutual inductance impedance of a double-circuit line without a complete shutdown. Summary of the Invention

[0005] To address the problem of accurately measuring the mutual inductance impedance of a double-circuit line without a complete shutdown, this invention provides a live testing system and method for the mutual inductance of transmission lines that considers supercapacitor energy storage.

[0006] In a first aspect, embodiments of the present invention provide a transmission line mutual inductance live-line testing system considering supercapacitor energy storage. The testing system includes a supercapacitor energy storage power supply, a de-energized line, an operating line, and a controller. An isolation transformer is installed between the de-energized line and the operating line. The de-energized line is equipped with a frequency converter and a first synchronous measurement unit. The operating line is equipped with a current-limiting resistor, an operating line power supply, a second synchronous measurement unit, and a third synchronous measurement unit. The frequency converter is internally equipped with a frequency converter. The controller is electrically connected to the frequency converter, the first synchronous measurement unit, the second synchronous measurement unit, and the third synchronous measurement unit, respectively. The frequency converter is connected to the supercapacitor energy storage power supply. The first synchronous measurement unit is used to measure the current and voltage at the first primary tap of the power outage line; The second synchronous measurement unit is used to measure the current and voltage at the first secondary tap of the power supply of the operating line; The third synchronous measurement unit is used to measure the voltage at the second secondary tap of the power supply of the operating line. The controller is used to perform the following operations: in response to the start mutual inductance energization test signal, it controls the heterogeneous power supply to work at a first preset frequency for a first preset duration, and then acquires the first dataset collected by the first synchronous measurement unit, the second synchronous measurement unit and the third synchronous measurement unit; The differential frequency power supply is controlled to switch to the second preset frequency. After the second preset time, the second dataset collected by the first synchronous measurement unit, the second synchronous measurement unit, and the third synchronous measurement unit is acquired. The first preset frequency and the second preset frequency are different frequencies. Based on the first dataset and the second dataset, the mutual inductance impedance of the double-circuit line is determined.

[0007] Secondly, embodiments of the present invention provide a method for testing the mutual inductance of transmission lines considering supercapacitor energy storage. The method uses the aforementioned test system for testing the mutual inductance of transmission lines considering supercapacitor energy storage to test de-energized lines and operating lines, and to obtain the mutual inductance impedance of double-circuit lines.

[0008] This invention provides a live-line testing system and method for transmission line mutual inductance considering supercapacitor energy storage. The system includes a supercapacitor energy storage power supply, a de-energized line, an operating line, and a controller. To eliminate electromagnetic interference coupling between the operating line and the de-energized line, an isolation transformer is added between them to block power frequency signal crosstalk through magnetic isolation. Specifically, the de-energized line is equipped with a different frequency power supply and a first synchronous measurement unit. The different frequency power supply is responsible for outputting a test excitation signal of a specific frequency, and the first synchronous measurement unit collects the current and voltage at the first primary tap of the de-energized line. The operating line is equipped with a current-limiting resistor, an operating line power supply, a second synchronous measurement unit, and a third synchronous measurement unit. The current-limiting resistor effectively suppresses abnormal current surges that may occur during the test, ensuring the safety of the operating line equipment. The different frequency power supply is connected to the supercapacitor energy storage power supply. The second synchronous measurement unit is used to monitor the current and voltage at the first secondary tap of the operating line power supply, and the third synchronous measurement unit is used to detect the voltage signal at the second secondary tap. The controller is electrically connected to a different frequency power supply, a first synchronous measurement unit, a second synchronous measurement unit, and a third synchronous measurement unit. Upon receiving a signal to begin mutual inductance energization testing, the controller first controls the different frequency power supply to operate at a first preset frequency. After a first preset duration, it synchronously retrieves current and voltage data collected by the three measurement units, forming a first dataset. Subsequently, the controller switches the different frequency power supply to a second preset frequency, and after a second preset duration, it acquires current and voltage data collected by the three measurement units, forming a second dataset. Based on the first and second datasets, the mutual inductance impedance of the double-circuit line is determined. Thus, this invention avoids the economic losses and safety risks of full power outage testing, and effectively avoids power frequency interference through different frequency signals, improving the accuracy of mutual inductance parameter measurement under partial power outage conditions. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 A structural diagram of a transmission line mutual inductance live testing system considering supercapacitor energy storage is shown according to one embodiment; Figure 2 A flowchart of a method for testing the energized mutual inductance of a transmission line considering supercapacitor energy storage, according to one embodiment, is shown. Detailed Implementation

[0011] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0012] Please refer to Figure 1 This invention provides a transmission line mutual inductance live testing system considering supercapacitor energy storage. The system includes a supercapacitor energy storage power supply (not shown in the figure), a de-energized line, an operating line, and a controller (not shown in the figure). An isolation transformer is installed between the de-energized line and the operating line. The de-energized line is equipped with a frequency converter and a first synchronous measurement unit (i.e., synchronous measurement unit 1 in the figure). The operating line is equipped with a current limiting resistor (i.e., current limiting resistor R in the figure), an operating line power supply, a second synchronous measurement unit (i.e., synchronous measurement unit 2 in the figure), and a third synchronous measurement unit (i.e., synchronous measurement unit 3 in the figure). The frequency converter is installed inside the frequency converter. The controller is electrically connected to the frequency converter, the first synchronous measurement unit, the second synchronous measurement unit, and the third synchronous measurement unit, respectively. The frequency converter is connected to the supercapacitor energy storage power supply. The first synchronous measurement unit is used to measure the current and voltage at the first primary tap (i.e., primary tap 1 in the figure) of the power outage line. The second synchronous measurement unit is used to measure the current and voltage at the first secondary tap (i.e., secondary tap 1 in the figure) of the power supply of the operating line. The third synchronous measurement unit is used to measure the voltage at the second secondary tap (i.e., secondary tap 2 in the figure) of the power supply of the operating line. The controller is used to perform the following operations: in response to the start mutual inductance energization test signal, it controls the variable frequency power supply to work at a first preset frequency for a first preset time, and then acquires the first dataset collected by the first synchronous measurement unit, the second synchronous measurement unit and the third synchronous measurement unit. The control unit switches the power supply to the second preset frequency and, after the second preset duration, acquires the second dataset collected by the first, second, and third synchronous measurement units; wherein the first and second preset frequencies are different frequencies. Based on the first and second datasets, the mutual inductance impedance of the double-circuit line is determined.

[0013] In this embodiment, the system includes a supercapacitor energy storage power supply, a power outage line, an operating line, and a controller. To eliminate electromagnetic interference coupling between the operating line and the power outage line, an isolation transformer is added between them to block power frequency signal crosstalk through magnetic isolation. Specifically, the power outage line is equipped with a different frequency power supply and a first synchronous measurement unit. The different frequency power supply is responsible for outputting a test excitation signal of a specific frequency, and the first synchronous measurement unit collects the current and voltage at the first primary tap of the power outage line. The operating line is equipped with a current-limiting resistor, an operating line power supply, a second synchronous measurement unit, and a third synchronous measurement unit. The current-limiting resistor effectively suppresses abnormal current surges that may occur during testing, ensuring the safety of the operating line equipment. The different frequency power supply is connected to the supercapacitor energy storage power supply. The second synchronous measurement unit is used to monitor the current and voltage at the first secondary tap of the operating line power supply, and the third synchronous measurement unit is used to detect the voltage signal at the second secondary tap. The controller is electrically connected to the variable frequency power supply, the first synchronous measurement unit, the second synchronous measurement unit, and the third synchronous measurement unit. The variable frequency power supply has an internal frequency converter. Upon receiving the signal to start the mutual inductance energization test, it first controls the power supply to operate at a first preset frequency. After a first preset duration, it synchronously retrieves the current and voltage data collected by the three measurement units, forming a first dataset. Subsequently, it controls the power supply to switch to a second preset frequency, and after a second preset duration, it acquires the current and voltage data collected by the three measurement units, forming a second dataset. Based on the first and second datasets, the mutual inductance impedance of the double-circuit line is determined. Thus, this invention avoids the economic losses and safety risks of a complete power outage test, and effectively avoids power frequency interference through variable frequency signals, improving the accuracy of mutual inductance parameter measurements under partial power outage conditions.

[0014] In one embodiment of the present invention, the supercapacitor energy storage power supply includes a supercapacitor module, a capacitor management system, an energy storage converter, and auxiliary protection devices. Supercapacitor modules are used to store and release electrical energy; The capacitor management system is used to monitor the status of the supercapacitor module; Energy storage converters are used to convert AC and DC electrical energy; The auxiliary protection device is used to provide protection for supercapacitor modules, capacitor management systems, and energy storage converters.

[0015] In this embodiment, the supercapacitor energy storage power supply includes a supercapacitor module, a capacitor management system (CMS), an energy storage converter, and auxiliary protection devices. The supercapacitor module utilizes the principle of electrostatic energy storage to achieve rapid storage and release of electrical energy. The CMS is used to collect parameters such as voltage and temperature of the supercapacitor module in real time. The energy storage converter is responsible for converting the DC output from the supercapacitor module into AC, or converting external AC to DC for charging. The auxiliary protection devices provide a safe operating environment for the supercapacitor module, capacitor management system, and energy storage converter through functions such as heat dissipation regulation, overcurrent protection, and physical isolation.

[0016] In one embodiment of the present invention, a DC connection busbar is provided between the supercapacitor module and the energy storage converter. The supercapacitor module is provided with a voltage sensor and a temperature sensor. The energy storage converter is provided with a DC side interface, an AC side interface and a control signal interface. The capacitor management system is provided with a data acquisition interface and a control output interface. The auxiliary protection device includes a heat dissipation component, an overcurrent protection module and a protective cabinet. The data acquisition interface of the capacitor management system is electrically connected to the voltage sensor and the temperature sensor of the supercapacitor module, respectively.

[0017] In this embodiment, a high-strength electrical connection is achieved between the supercapacitor module and the energy storage converter via a low-impedance DC connection busbar. The supercapacitor module is equipped with voltage and temperature sensors. The voltage sensor acquires real-time voltage fluctuations of the module and individual cells, while the temperature sensor monitors temperature changes in specific areas. The energy storage converter's DC-side interface is rigidly connected to the DC connection busbar via a copper busbar, enabling DC power interaction with the supercapacitor module. The Capacitor Management System (CMS) has dedicated data acquisition and control output interfaces. The data acquisition interface establishes stable electrical connections with the voltage and temperature sensors of the supercapacitor module via multi-core shielded cables. Auxiliary protection devices include heat dissipation components, overcurrent protection modules, and protective cabinets.

[0018] In one embodiment of the present invention, the control output interface of the capacitor management system is electrically connected to the control signal interface of the energy storage converter, the heat dissipation component of the auxiliary protection device, and the overcurrent protection module; the DC side interface of the energy storage converter is connected to the DC connection busbar of the supercapacitor module; and the AC side interface of the energy storage converter is connected to the heterogeneous power supply.

[0019] In this embodiment, the control output interface of the capacitor management system (CMS) establishes stable electrical connections with the control signal interface of the energy storage converter, the heat dissipation components of the auxiliary protection device, and the overcurrent protection module through a multi-channel shielded control harness. The DC-side interface of the energy storage converter achieves a rigid electrical connection with the supercapacitor module through a low-impedance DC connection busbar, ensuring efficient DC power transmission; its AC-side interface is reliably connected to a different frequency power supply via an adapter cable to complete the conversion and transmission of electrical energy.

[0020] In one embodiment of the present invention, the first preset frequency is 45 Hz, the second preset frequency is 55 Hz, and the mutual inductance impedance of the double-circuit line includes the mutual inductance impedance of the de-energized line and the mutual inductance impedance of the operating line.

[0021] In this embodiment, the first preset frequency is set to 45 Hz, and the second preset frequency is set to 55 Hz, both of which have a 5 Hz frequency difference from the 50 Hz power frequency of the operating line. This frequency configuration avoids the strong interference band of the power frequency signal, and through the symmetrically distributed frequency offset design, it can effectively compensate for the measurement error caused by the frequency deviation.

[0022] In one embodiment of the present invention, after the controller executes the response signal to start mutual inductance energization test and controls the heterogeneous power supply to operate at a first preset frequency for a first preset duration, it acquires a first dataset collected by the first synchronous measurement unit, the second synchronous measurement unit, and the third synchronous measurement unit, and performs the following operations: In response to the start of mutual inductance energization test signal, after controlling the heterogeneous frequency power supply to operate at the first preset frequency for the first preset time, the first current and first voltage measured by the first synchronous measurement unit are collected, the second current and second voltage measured by the second synchronous measurement unit are collected, and the third voltage measured by the third synchronous measurement unit is collected. The first dataset is constructed based on the first current, the first voltage, the second current, the second voltage, and the third voltage.

[0023] In this embodiment, after responding to the externally input start mutual inductance energization test signal, the controller initiates the first stage of the preset test process. First, the controller sends a frequency control command to the power supply, driving it to stably output the test excitation signal at a first preset frequency (e.g., 45Hz, to meet grid anti-interference requirements). After the power supply continues to operate for a first preset duration (usually set to 3-5 seconds to ensure the circuit reaches a steady-state operating condition), the controller synchronously triggers a data acquisition command, retrieving monitoring data from three synchronous measurement units: acquiring the first current (excitation-side output current) and the first voltage (excitation-side applied voltage) measured by the first synchronous measurement unit at the first primary side tap of the de-energized line; acquiring the second current (operating-side induced current) and the second voltage (operating-side corresponding voltage) measured by the second synchronous measurement unit at the first secondary side tap of the operating line power supply; and acquiring the third voltage (operating-side induced voltage supplementary data) measured by the third synchronous measurement unit at the second secondary side tap of the operating line power supply. Finally, the acquired first current, first voltage, second current, second voltage, and third voltage are integrated to construct the first dataset.

[0024] In one embodiment of the present invention, after the controller switches the power supply to a second preset frequency, it acquires a second dataset collected by the first, second, and third synchronization measurement units after a second preset time period, and performs the following operations: The control unit switches the power supply to the second preset frequency. After the second preset time, the system collects the fourth current and fourth voltage measured by the first synchronous measurement unit, the fifth current and fifth voltage measured by the second synchronous measurement unit, and the sixth voltage measured by the third synchronous measurement unit. A second dataset is constructed based on the fourth current, fourth voltage, fifth current, fifth voltage, and sixth voltage.

[0025] In this embodiment, after completing the first stage of data acquisition, the controller initiates the second stage of the test process. First, a frequency switching command is sent to the power supply to control it to switch from a first preset frequency to a second preset frequency (e.g., 55Hz, to create a reasonable frequency difference with the first frequency to eliminate power frequency interference). After switching frequencies, the power supply continues to operate at the second preset frequency for a second preset duration (consistent with the first preset duration, typically 3-5 seconds, to ensure the circuit reaches a stable state again). The fourth current (excitation current at the new frequency) and the fourth voltage (excitation voltage at the new frequency) at the first primary tap of the de-energized line are acquired from the first synchronous measurement unit. The fifth current (induced current at the new frequency) and the fifth voltage (corresponding voltage at the new frequency) at the first secondary tap of the operating line power supply are acquired from the second synchronous measurement unit. The sixth voltage (supplementary induced voltage data at the new frequency) at the second secondary tap of the operating line power supply is captured from the third synchronous measurement unit. Subsequently, a second dataset is constructed based on the fourth current, fourth voltage, fifth current, fifth voltage, and sixth voltage.

[0026] In one embodiment of the present invention, when the controller executes the logic for determining the mutual inductance impedance of a double-circuit line based on a first dataset and a second dataset, it performs the following formula: In the formula, Z 1 represents the mutual inductance impedance of the power outage line. I 1 represents the first current. I 2 represents the second current. I 4 represents the fourth current. I 5 represents the fifth current. U 1 represents the first voltage. U 2 represents the second voltage. U 4 represents the fourth voltage. U 5 represents the fifth voltage, and C represents the preset voltage-current phase difference.

[0027] In one embodiment of the present invention, when the controller executes the logic for determining the mutual inductance impedance of a double-circuit line based on a first dataset and a second dataset, it performs the following formula: In the formula, Z 2 represents the mutual inductance impedance of the operating line. U 3 represents the third voltage. U 6 represents the sixth voltage.

[0028] like Figure 2 As shown in the figure, this embodiment provides a method for live testing of mutual inductance in transmission lines considering supercapacitor energy storage, including: Step 200: Apply the aforementioned transmission line mutual inductance live test system that considers supercapacitor energy storage to test the de-energized and operating lines and obtain the mutual inductance impedance of the double-circuit line.

[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0030] Those skilled in the art will understand that all or part of the steps of the above method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it performs the steps of the above method embodiments. The aforementioned storage medium includes various media that can store program code, such as ROM, RAM, magnetic disk, or optical disk.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A live-line testing system for mutual inductance of transmission lines considering supercapacitor energy storage, characterized in that, The testing system includes a supercapacitor energy storage power supply, a power outage line, an operating line, and a controller. An isolation transformer is installed between the power outage line and the operating line. The power outage line is equipped with a variable frequency power supply and a first synchronous measurement unit. The operating line is equipped with a current-limiting resistor, an operating line power supply, a second synchronous measurement unit, and a third synchronous measurement unit. The variable frequency power supply has an internal frequency converter. The controller is electrically connected to the variable frequency power supply, the first synchronous measurement unit, the second synchronous measurement unit, and the third synchronous measurement unit, respectively. The variable frequency power supply is connected to the supercapacitor energy storage power supply. The first synchronous measurement unit is used to measure the current and voltage at the first primary tap of the power outage line; The second synchronous measurement unit is used to measure the current and voltage at the first secondary tap of the power supply of the operating line; The third synchronous measurement unit is used to measure the voltage at the second secondary tap of the power supply of the operating line. The controller is used to perform the following operations: in response to the start mutual inductance energization test signal, it controls the heterogeneous power supply to work at a first preset frequency for a first preset duration, and then acquires the first dataset collected by the first synchronous measurement unit, the second synchronous measurement unit and the third synchronous measurement unit; The differential frequency power supply is controlled to switch to the second preset frequency. After the second preset time, the second dataset collected by the first synchronous measurement unit, the second synchronous measurement unit, and the third synchronous measurement unit is acquired. The first preset frequency and the second preset frequency are different frequencies. Based on the first dataset and the second dataset, the mutual inductance impedance of the double-circuit line is determined.

2. The testing system according to claim 1, characterized in that, The supercapacitor energy storage power supply includes a supercapacitor module, a capacitor management system, an energy storage converter, and auxiliary protection devices. The supercapacitor module is used to store and release electrical energy; The capacitor management system is used to monitor the status of the supercapacitor module; The energy storage converter is used to convert AC and DC power. The auxiliary protection device is used to provide protection for the supercapacitor module, the capacitor management system, and the energy storage converter.

3. The testing system according to claim 2, characterized in that, A DC connection busbar is provided between the supercapacitor module and the energy storage converter. The supercapacitor module is equipped with a voltage sensor and a temperature sensor. The energy storage converter is provided with a DC side interface, an AC side interface, and a control signal interface. The capacitor management system is provided with a data acquisition interface and a control output interface. The auxiliary protection device includes a heat dissipation component, an overcurrent protection module, and a protective cabinet. The data acquisition interface of the capacitor management system is electrically connected to the voltage sensor and the temperature sensor of the supercapacitor module, respectively.

4. The testing system according to claim 3, characterized in that, The control output interface of the capacitor management system is electrically connected to the control signal interface of the energy storage converter, the heat dissipation component of the auxiliary protection device, and the overcurrent protection module. The DC side interface of the energy storage converter is connected to the DC connection busbar of the supercapacitor module, and the AC side interface of the energy storage converter is connected to the heterogeneous power supply.

5. The testing system according to claim 1, characterized in that, The first preset frequency is 45 Hz, the second preset frequency is 55 Hz, and the mutual inductance impedance of the double-circuit line includes the mutual inductance impedance of the de-energized line and the mutual inductance impedance of the operating line.

6. The testing system according to claim 5, characterized in that, After the controller executes the response signal to start mutual inductance energization test and controls the heterogeneous power supply to operate at a first preset frequency for a first preset duration, it acquires a first dataset collected by the first synchronous measurement unit, the second synchronous measurement unit, and the third synchronous measurement unit, and performs the following operations: In response to the start mutual inductance energization test signal, after controlling the heterogeneous power supply to work at a first preset frequency for a first preset duration, the first current and first voltage measured by the first synchronous measurement unit are collected, and the second current and second voltage measured by the second synchronous measurement unit are collected. The third voltage measured by the third synchronous measurement unit is acquired; The first dataset is constructed based on the first current, the first voltage, the second current, the second voltage, and the third voltage.

7. The testing system according to claim 6, characterized in that, After the controller switches the heterogeneous power supply to the second preset frequency, it acquires a second dataset collected by the first, second, and third synchronization measurement units after a second preset time period, and performs the following operations: The power supply is controlled to switch to the second preset frequency. After the second preset time, the fourth current and fourth voltage measured by the first synchronous measurement unit are collected, and the fifth current and fifth voltage measured by the second synchronous measurement unit are collected. The sixth voltage measured by the third synchronous measurement unit is acquired; The second dataset is constructed based on the fourth current, the fourth voltage, the fifth current, the fifth voltage, and the sixth voltage.

8. The testing system according to claim 7, characterized in that, When the controller performs the step of determining the mutual inductance impedance of the double-circuit line based on the first dataset and the second dataset, it executes the following formula: In the formula, Z 1 represents the mutual inductance impedance of the power outage line. I 1 represents the first current. I 2 represents the second current. I 4 represents the fourth current. I 5 represents the fifth current. U 1 represents the first voltage. U 2 represents the second voltage. U 4 represents the fourth voltage. U 5 represents the fifth voltage, and C represents the preset voltage-current phase difference.

9. The testing system according to claim 8, characterized in that, When the controller performs the step of determining the mutual inductance impedance of the double-circuit line based on the first dataset and the second dataset, it executes the following formula: In the formula, Z 2 represents the mutual inductance impedance of the operating line. U 3 represents the third voltage. U 6 refers to the sixth voltage.

10. A method for live testing of mutual inductance in transmission lines considering supercapacitor energy storage, characterized in that, The transmission line mutual inductance live test system considering supercapacitor energy storage as described in any one of claims 1 to 9 is used to test de-energized lines and operating lines, and to obtain the mutual inductance impedance of double-circuit lines.

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