Impedance scanning device

Abstract

The invention discloses an impedance scanning device, and relates to the technical field of new energy. The device is connected with a digital model terminal of the battery energy storage system through a network cable, and comprises a working condition setting module, a voltage disturbance generator, an impedance signal generator and an impedance data memory, the working condition setting module receives manually input working condition parameters and transmits the working condition parameters to the battery energy storage system digital model terminal; the voltage disturbance generator receives a manually input voltage disturbance parameter, and transmits a voltage disturbance signal generated based on the voltage disturbance parameter to the battery energy storage system digital model terminal; the impedance signal generator receives the voltage signal and the current signal, and transmits an impedance signal generated based on the voltage signal and the current signal to the impedance data memory; the impedance data memory receives and stores the impedance signal from the impedance signal generator. According to the invention, the problem of lack of an impedance scanning device for a digital model of a battery energy storage system can be solved.

Description

Technical Field

[0001] The present invention relates to the field of new energy technology, and in particular to an impedance scanning device. Background Art

[0002] This section is intended to provide a background or context to the embodiments of the invention recited in the claims. No admission is made that the description herein is prior art by inclusion in this section.

[0003] In order to reduce problems such as "wind and solar abandonment", improve the level of new energy consumption, and alleviate the difficulties in regulating and operating the power system, the centralized configuration of energy storage systems at the grid connection points of new energy stations is an effective solution to smooth the power fluctuations of the AC system and improve the reliability of system operation. Among them, battery energy storage systems are the most common in new energy stations. However, after the battery energy storage system is connected to the power system, the oscillation characteristics of the power system in the subsynchronous frequency, supersynchronous frequency and medium and high frequency ranges are complex and changeable. By obtaining the impedance characteristics of the battery energy storage system in the subsynchronous frequency, supersynchronous frequency, medium and high frequency ranges, the impact of the access of the battery energy storage system on the damping characteristics of the power grid within the broadband range can be effectively understood. At the same time, the impedance characteristics of the battery energy storage system are also the basis for evaluating the broadband oscillation risk of the battery energy storage system connected to the power grid. However, there is currently no impedance scanning and stability judgment device developed for the digital model of the battery energy storage system. Summary of the invention

[0004] An embodiment of the present invention provides an impedance scanning device to solve the problem of the lack of impedance scanning devices for a digital model of a battery energy storage system. The device is connected to a digital model terminal of the battery energy storage system via a network cable, and includes: a working condition setting module, a voltage disturbance generator, an impedance signal generator, an impedance data storage device, and a digital quantity input module respectively connected to the working condition setting module and the digital model terminal of the battery energy storage system;

[0005] The operating condition setting module is connected to the digital model terminal of the battery energy storage system, and is used to receive the operating condition parameters input manually, and transmit the operating condition parameters to the digital model terminal of the battery energy storage system;

[0006] A voltage disturbance generator is connected to the digital model terminal of the battery energy storage system, and is used to receive manually input voltage disturbance parameters, generate voltage disturbance signals according to the voltage disturbance parameters, and transmit the voltage disturbance signals to the digital model terminal of the battery energy storage system;

[0007] an impedance signal generator, connected to the digital model terminal of the battery energy storage system, for receiving a voltage signal and a current signal from the digital model terminal of the battery energy storage system, generating a positive-sequence impedance signal according to the voltage signal and the current signal, judging whether there is an oscillation risk in the digital model terminal of the battery energy storage system according to the generated positive-sequence impedance signal, generating a judgment result, and transmitting the positive-sequence impedance signal and the judgment result to an impedance data storage device;

[0008] An impedance data storage device is connected to the impedance signal generator and is used to receive and store the positive and negative sequence impedance signals and the judgment results from the impedance signal generator;

[0009] The working condition setting module is also used to: transmit working condition parameters to the digital input module;

[0010] The digital input module is used to receive operating parameters; digitize the operating parameters to generate digital operating parameters, and transmit the digital operating parameters to the digital model terminal of the battery energy storage system.

[0011] The present invention provides an impedance scanning device, which is connected to a digital model terminal of a battery energy storage system through a network cable, and comprises: a working condition setting module, a voltage disturbance generator, an impedance signal generator, an impedance data storage device, and a digital quantity input module respectively connected to the working condition setting module and the digital model terminal of the battery energy storage system; the working condition setting module is connected to the digital model terminal of the battery energy storage system, and is used to receive working condition parameters input manually, and transmit the working condition parameters to the digital model terminal of the battery energy storage system; the voltage disturbance generator is connected to the digital model terminal of the battery energy storage system, and is used to receive voltage disturbance parameters input manually, and generate a voltage disturbance signal according to the voltage disturbance parameter, and transmit the voltage disturbance signal to the digital model terminal of the battery energy storage system; the impedance signal generator is connected to the digital model terminal of the battery energy storage system, and is used to receive the working condition parameters input manually, and transmit the working condition parameters ... The digital model terminal receives voltage signals and current signals, generates positive and negative sequence impedance signals according to the voltage signals and current signals, determines whether there is an oscillation risk in the digital model terminal of the battery energy storage system according to the generated positive and negative sequence impedance signals, generates a judgment result, and transmits the positive and negative sequence impedance signals and the judgment result to the impedance data storage device; the impedance data storage device is connected to the impedance signal generator, and is used to receive and store the positive and negative sequence impedance signals and the judgment result from the impedance signal generator; the operating condition setting module is also used to: transmit the operating condition parameters to the digital quantity input module; the digital quantity input module is used to receive the operating condition parameters; digitize the operating condition parameters, generate digital quantity operating condition parameters, and transmit the digital quantity operating condition parameters to the digital model terminal of the battery energy storage system, thus solving the problem of the lack of impedance scanning and stability judgment device for the digital model of the battery energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0013] Figure 1 A schematic diagram of an impedance scanning device provided in an embodiment of the present invention;

[0014] Figure 2 is a schematic diagram of a specific example of an impedance scanning device provided in an embodiment of the present invention;

[0015] Figure 3 A schematic diagram of a human-computer interaction module provided in an embodiment of the present invention;

[0016] Figure 4 An impedance curve diagram of a specific example of a digital model of a battery energy storage system provided in an embodiment of the present invention;

[0017] Figure 5 An impedance curve diagram of a specific example of a digital model of a battery energy storage system provided in an embodiment of the present invention;

[0018] Figure 6 This is an impedance curve diagram of a specific example of a digital model of a battery energy storage system provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0019] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0020] The acquisition, storage, use, and processing of data in the technical solution of this application comply with the relevant provisions of laws and regulations.

[0021] The term "and / or" herein only describes an association relationship, indicating that three relationships may exist. For example, A and / or B may represent the following three situations: A exists alone, A and B exist at the same time, and B exists alone. In addition, the term "at least one" herein represents any combination of at least two of any one or more of a plurality of. For example, including at least one of A, B, and C may represent including any one or more elements selected from the set consisting of A, B, and C.

[0022] In the description of this specification, the terms "include", "including", "have", "contain", etc. are all open terms, which mean including but not limited to. The descriptions with reference to the terms "one embodiment", "a specific embodiment", "some embodiments", "for example", etc. mean that the specific features, structures or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. The order of steps involved in each embodiment is used to schematically illustrate the implementation of the present application, and the order of steps is not limited and can be appropriately adjusted as needed.

[0023] In order to solve the problem of lack of impedance scanning and stability judgment means for the digital model of the battery energy storage system, an embodiment of the present invention provides an impedance scanning device. The device has its own analog input and output modules and digital output modules, and is only connected to the PC (Personal Computer) where the digital model of the battery energy storage system is located through a network cable, and can automatically adjust the working conditions of the battery energy storage system, and can realize the automatic switching scanning, continuous scanning, impedance calculation, impedance data storage and stability evaluation of the digital model of the battery energy storage system.

[0024] Figure 1 Schematic diagram of an impedance scanning device provided in an embodiment of the present invention, such as Figure 1 As shown, the impedance scanning device is connected to the digital model terminal 1 of the battery energy storage system through a network cable, and includes: a working condition setting module 2, a voltage disturbance generator 3, an impedance signal generator 4, an impedance data storage device 5, and a digital quantity input module connected to the working condition setting module 2 and the digital model terminal 1 of the battery energy storage system respectively;

[0025] The operating condition setting module 2 is connected to the battery energy storage system digital model terminal 1 and is used to receive the operating condition parameters input manually and transmit the operating condition parameters to the battery energy storage system digital model terminal 1;

[0026] The voltage disturbance generator 3 is connected to the battery energy storage system digital model terminal 1, and is used to receive the voltage disturbance parameters input manually, generate the voltage disturbance signal according to the voltage disturbance parameters, and transmit the voltage disturbance signal to the battery energy storage system digital model terminal 1;

[0027] The impedance signal generator 4 is connected to the battery energy storage system digital model terminal 1, and is used to receive the voltage signal and the current signal from the battery energy storage system digital model terminal 1, generate the positive and negative sequence impedance signals according to the voltage signal and the current signal, judge whether there is an oscillation risk in the battery energy storage system digital model terminal 1 according to the generated positive and negative sequence impedance signals, generate a judgment result, and transmit the positive and negative sequence impedance signals and the judgment result to the impedance data storage 5;

[0028] The impedance data storage device 5 is connected to the impedance signal generator 4 and is used to receive and store the positive and negative sequence impedance signals and the judgment results from the impedance signal generator 4;

[0029] The working condition setting module 2 is also used to: transmit working condition parameters to the digital quantity input module;

[0030] The digital input module is used to receive operating parameters; digitize the operating parameters to generate digital operating parameters, and transmit the digital operating parameters to the digital model terminal 1 of the battery energy storage system.

[0031] Figure 2 FIG. 1 is a schematic diagram of a specific example of an impedance scanning device provided in an embodiment of the present invention, such as Figure 2 As shown, in one embodiment, the impedance scanning device may further include: a digital quantity input module connected to the working condition setting module 2 and the battery energy storage system digital model terminal 1 respectively.

[0032] The operating condition setting module (2) is also used to transmit the operating condition parameters to the digital quantity input module.

[0033] The digital quantity input module is used to receive the operating condition parameters; and transmit the digital quantity operating condition parameters generated based on the operating condition parameters to the digital model terminal 1 of the battery energy storage system.

[0034] In this embodiment, the operating condition parameters may include: active power P, reactive power Q, voltage V, one of them or any combination thereof.

[0035] In one embodiment, the impedance scanning device may further include: an analog input module connected to the voltage disturbance generator 3 and the battery energy storage system digital model terminal 1 respectively.

[0036] The voltage disturbance generator (3) is also used to transmit the voltage disturbance signal to the analog input module.

[0037] The analog input module is used to receive the voltage disturbance signal and superimpose the voltage disturbance signal on the grid voltage in the digital model terminal 1 of the battery energy storage system. Figure 2As shown, the voltage disturbance generator outputs the voltage disturbance signals Ua_d, Ub_d, and Uc_d to the analog input module, and the analog input module superimposes the voltage disturbance signals on the grid voltage in the digital model terminal 1 of the battery energy storage system.

[0038] In one embodiment, the impedance scanning device may further include: an analog output module connected to the impedance signal generator 4 and the battery energy storage system digital model terminal 1 respectively.

[0039] The analog output module is used to receive the voltage signal and the current signal from the digital model terminal 1 of the battery energy storage system; convert the voltage signal into an analog voltage signal, convert the current signal into an analog current signal, and transmit the analog voltage signal and the analog current signal to the digital model terminal 1 of the battery energy storage system respectively.

[0040] In this embodiment, the digital input module, the analog input module, and the analog output module can all be integrated into the impedance scanning device, and only connected to the PC end where the digital model of the battery energy storage system to be tested is located through a network cable, thereby reducing the complexity of the test wiring and improving the test efficiency.

[0041] In this embodiment, the three-phase voltages Ua, Ub, and Uc at ports abc and the three-phase currents Ia, Ib, and Ic at ports abc of the digital model terminal 1 of the battery energy storage system are transmitted to the impedance signal generator 4 through the analog output module. The impedance signal generator 4 stores the positive and negative sequence impedance signals Zp and Zn generated based on the voltage signal and the current signal in the hard disk of the impedance scanning device through the impedance data storage device 5.

[0042] Figure 3 This is a schematic diagram of a human-computer interaction module provided in an embodiment of the present invention. In one embodiment, the impedance scanning device may also include: a human-computer interaction module connected to the working condition setting module 2, used to: receive manually input working condition parameters and output the working condition parameters to the working condition setting module 2.

[0043] In this embodiment, the impedance scanning device can be equipped with a liquid crystal display screen as the human-computer interaction interface of the human-computer interaction module, which can set the impedance scanning parameters and the working conditions of the digital model of the battery energy storage system, and is easy to operate and highly friendly.

[0044] In this embodiment, the human-computer interaction module is connected to the voltage disturbance generator 3 ; the human-computer interaction module is used to receive the voltage disturbance parameters manually input and output the voltage disturbance parameters to the voltage disturbance generator 3 .

[0045] In this embodiment, the voltage disturbance parameter may include: step size, initial frequency, end frequency, disturbance size, one of them or any combination thereof.

[0046] like Figure 3 As shown, the manual interaction module can receive manually input voltage disturbance parameters such as step size, initial frequency, end frequency, disturbance size, etc. through the numeric keyboard of the human-computer interaction interface. For example, the step size is manually set to 50, the initial frequency is 1, the end frequency is 2500, and the disturbance size is 0.01. The units of each part can also be set manually.

[0047] In this embodiment, the voltage disturbance generator 3 can generate an abc three-phase voltage disturbance signal in the range of 1 to 2500 Hz according to the voltage disturbance parameter. The disturbance magnitude adjustment range can be 0.1% to 5% of the port voltage, and is superimposed on the grid voltage in the digital model terminal 1 of the battery energy storage system through the analog input module.

[0048] In one embodiment, the human-computer interaction module is specifically used to receive multiple groups of operating condition parameters manually input, and output the multiple groups of operating condition parameters to the operating condition setting module 2.

[0049] In one embodiment, the operating condition setting module 2 is specifically used to receive multiple groups of operating condition parameters from the human-computer interaction module; and transmit the multiple groups of operating condition parameters received from the human-computer interaction module to the battery energy storage system digital model terminal 1.

[0050] like Figure 3 As shown, the manual interaction module can receive multiple groups of working conditions such as active power, reactive power, and voltage manually input through the numeric keyboard of the human-machine interaction interface. For example, the parameters of working condition 1 are set to active power 2000, reactive power 0, and voltage 600; the parameters of working condition 2 are set to active power 0, reactive power 0, and voltage 600; the parameters of working condition 3 are set to active power 1000, reactive power 0, and voltage 600. Multiple groups of working conditions can also be added as needed.

[0051] In this embodiment, the working condition setting module 2 can cooperate with the pure hardware delay device to continuously adjust the impedance scanning working condition of the battery energy storage system digital model terminal 1, such as the active power, reactive power and port voltage of the battery energy storage system, and act on the battery energy storage system digital model terminal 1 through the digital quantity input module. The working condition setting module 2 can be combined with a pure hardware delay device or a pure hardware timer to automatically perform the impedance scanning work of the next working condition after the impedance scanning work of one working condition is completed, thereby reducing the manual operation process and improving work efficiency.

[0052] In one embodiment, the impedance scanning device further includes an indicator light, which turns green when the human-computer interaction module starts to receive the manually input working condition parameters, and turns red after the green light continues for a preset period of time.

[0053] The above information is set in the human-computer interaction module of the impedance scanning device. After clicking Start, the impedance scanning device can perform impedance scanning, and the indicator light is green at this time; until the impedance scanning of the battery energy storage system under all working conditions is completed, the indicator light will turn red, and the scanned impedance will be automatically processed and stored. The impedance curves of the digital model of the battery energy storage system under three different working conditions obtained by scanning are shown as follows: Figure 4-Figure 6 The impedance curve of the digital model of the battery energy storage system under the condition of active power 2000kW is shown in Figure 4 As shown in Figure 2, the impedance curve of the digital model of the battery energy storage system under the condition of active power 0kW is as follows: Figure 5 As shown in Figure 2, the impedance curve of the digital model of the battery energy storage system under the condition of active power -1000kW is as follows: Figure 6 As shown. Figure 4-Figure 6 From the impedance curve, it can be seen that the impedance scanning device in the embodiment of the present invention can obtain the oscillation characteristics of the power system in the subsynchronous frequency, supersynchronous frequency and medium and high frequency ranges after the battery energy storage system is connected to the power system. This effectively understands the impact of the access of the battery energy storage system on the damping characteristics of the power grid within the broadband range. At the same time, basic data for evaluating the broadband oscillation risk of the battery energy storage system connected to the power grid is obtained. At the same time, the impedance scanning device can determine whether the digital model of the battery energy storage system has an oscillation risk based on the impedance characteristics of the digital model of the battery energy storage system.

[0054] In summary, the present invention provides an impedance scanning device, which is connected to a digital model terminal of a battery energy storage system through a network cable, and includes: a working condition setting module, a voltage disturbance generator, an impedance signal generator, an impedance data storage device, and a digital quantity input module connected to the working condition setting module and the digital model terminal of the battery energy storage system respectively; the working condition setting module is connected to the digital model terminal of the battery energy storage system, and is used to receive the working condition parameters input manually, and transmit the working condition parameters to the digital model terminal of the battery energy storage system; the voltage disturbance generator is connected to the digital model terminal of the battery energy storage system, and is used to receive the voltage disturbance parameters input manually, generate a voltage disturbance signal according to the voltage disturbance parameters, and transmit the voltage disturbance signal to the digital model terminal of the battery energy storage system; the impedance signal generator is connected to the digital model terminal of the battery energy storage system, and is used to receive the working condition parameters input manually, and generate a voltage disturbance signal according to the voltage disturbance parameter, and transmit the voltage disturbance signal to the digital model terminal of the battery energy storage system; the impedance signal generator is connected to the digital model terminal of the battery energy storage system, and is used to receive the working condition parameters input manually, and transmit the working condition parameters to the digital model terminal of the battery energy storage system. The digital model terminal of the battery energy storage system receives voltage signals and current signals, generates positive and negative sequence impedance signals according to the voltage signals and current signals, judges whether there is an oscillation risk in the digital model terminal of the battery energy storage system according to the generated positive and negative sequence impedance signals, generates a judgment result, and transmits the positive and negative sequence impedance signals and the judgment result to the impedance data storage device; the impedance data storage device is connected to the impedance signal generator, and is used to receive and store the positive and negative sequence impedance signals and the judgment result from the impedance signal generator; the operating condition setting module is also used to: transmit the operating condition parameters to the digital quantity input module; the digital quantity input module is used to receive the operating condition parameters; digitize the operating condition parameters, generate digital operating condition parameters, and transmit the digital operating condition parameters to the digital model terminal of the battery energy storage system, thus solving the problem of the lack of impedance scanning and stability judgment device for the digital model of the battery energy storage system.

[0055] In the embodiment of the present invention, the working conditions of the digital model of the battery energy storage system can be continuously adjusted. After the impedance scanning work of one test condition is completed, the impedance scanning work of the next condition can be automatically performed, which reduces the manual operation process and improves work efficiency.

[0056] In an embodiment of the present invention, the digital input module, the analog input module, and the analog output module are all integrated into the impedance scanning device, and are only connected to the PC end where the digital model of the battery energy storage system to be tested is located through a network cable, thereby reducing the complexity of the test wiring and improving the test efficiency.

[0057] In the embodiment of the present invention, the impedance scanning device is equipped with a liquid crystal display screen as a human-computer interaction interface, which can set the impedance scanning parameters and the working conditions of the digital model of the battery energy storage system, and is easy to operate and highly friendly.

[0058] The impedance scanning device in the embodiment of the present invention can determine whether the digital model of the battery energy storage system has an oscillation risk according to the impedance characteristics of the energy storage system.

[0059] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An impedance scanning device, characterized in that: The device is connected to the digital model terminal (1) of the battery energy storage system via a network cable, and comprises: an operating condition setting module (2), a voltage disturbance generator (3), an impedance signal generator (4), an impedance data storage device (5), and a digital quantity input module respectively connected to the operating condition setting module (2) and the digital model terminal (1) of the battery energy storage system; The operating condition setting module (2) is connected to the battery energy storage system digital model terminal (1) and is used to receive the operating condition parameters input manually and transmit the operating condition parameters to the battery energy storage system digital model terminal (1); A voltage disturbance generator (3) is connected to the battery energy storage system digital model terminal (1), and is used to receive a voltage disturbance parameter input manually, generate a voltage disturbance signal according to the voltage disturbance parameter, and transmit the voltage disturbance signal to the battery energy storage system digital model terminal (1); An impedance signal generator (4) is connected to the battery energy storage system digital model terminal (1), and is used to receive a voltage signal and a current signal from the battery energy storage system digital model terminal (1), generate a positive and negative sequence impedance signal according to the voltage signal and the current signal, judge whether the battery energy storage system digital model terminal (1) has an oscillation risk according to the generated positive and negative sequence impedance signal, generate a judgment result, and transmit the positive and negative sequence impedance signal and the judgment result to an impedance data storage device (5); An impedance data storage device (5) is connected to the impedance signal generator (4) and is used to receive and store the positive and negative sequence impedance signals and the judgment results from the impedance signal generator (4); The working condition setting module (2) is also used to: transmit working condition parameters to the digital quantity input module; The digital input module is used to receive operating condition parameters; digitize the operating condition parameters to generate digital operating condition parameters, and transmit the digital operating condition parameters to the digital model terminal (1) of the battery energy storage system.

2. The impedance scanning device according to claim 1, characterized in that: Also includes: An analog input module connected to the voltage disturbance generator (3) and the battery energy storage system digital model terminal (1) respectively; The voltage disturbance generator (3) is also used to: transmit the voltage disturbance signal to the analog input module; The analog input module is used to receive a voltage disturbance signal and superimpose the voltage disturbance signal on the grid voltage in the digital model terminal (1) of the battery energy storage system.

3. The impedance scanning device according to claim 1, characterized in that: Also includes: An analog output module connected to the impedance signal generator (4) and the battery energy storage system digital model terminal (1) respectively; The analog output module is used to receive a voltage signal and a current signal from a digital model terminal (1) of a battery energy storage system; convert the voltage signal into an analog voltage signal, convert the current signal into an analog current signal, and transmit the analog voltage signal and the analog current signal to the digital model terminal (1) of the battery energy storage system respectively.

4. The impedance scanning device according to claim 1, characterized in that: Also includes: The human-computer interaction module connected to the working condition setting module (2) is used to: Receive the manually inputted working condition parameters and transmit them to the working condition setting module (2).

5. The impedance scanning device according to claim 4, characterized in that: The human-computer interaction module is connected to the voltage disturbance generator (3); The human-computer interaction module is also used to receive voltage disturbance parameters input manually, and transmit the voltage disturbance parameters to the voltage disturbance generator (3).

6. The impedance scanning device according to claim 4, characterized in that: The human-computer interaction module is specifically used for: Receiving multiple sets of operating condition parameters manually input, and transmitting the multiple sets of operating condition parameters to the operating condition setting module (2); The operating condition setting module (2) is specifically used to transmit multiple groups of operating condition parameters received from the human-computer interaction module to the battery energy storage system digital model terminal (1).

7. The impedance scanning device according to claim 4, characterized in that: Also includes indicator lights; The indicator light turns green when the human-machine interaction module starts to receive manually input operating parameters, and turns red after the green light continues for a preset period of time.

8. The impedance scanning device according to claim 1, characterized in that: The operating parameters include: active power, reactive power, voltage or any combination thereof.

9. The impedance scanning device according to claim 1, characterized in that: The voltage disturbance parameters include: step size, initial frequency, end frequency, disturbance size, or any combination thereof.

10. The impedance scanning device according to claim 1, characterized in that: The frequency range of the voltage disturbance signal is 1 Hz to 2500 Hz, and the adjustment range is 0.1% to 5% of the port voltage of the voltage disturbance generator (3).

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