Design method of miniaturized non-intrusive power grid oscillograph

Abstract

The invention discloses a design method of a miniaturized non-intrusive power grid oscillograph, which relates to the technical field of oscillographs, and comprises the following steps: carrying out single-circuit sampling on a circuit for analyzing the oscillograph to obtain single-circuit characteristics; executing power grid joint sampling based on the single circuit characteristics, and obtaining power grid circuit characteristics of the circuit based on a sampling result; calibrating the real-time current curve based on the sampled real-time data; the method is used for solving the problems that in an existing non-intrusive power grid oscillograph design method, data detected by an oscillograph cannot be effectively calibrated, so that when a load in a power grid is complex, the superimposed effect of total current / voltage affects the current / voltage of a circuit detected and monitored by the oscillograph, the identification accuracy of the oscillograph is reduced, and the identification accuracy of the oscillograph is affected. And the circuit cannot be effectively monitored.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of wave recorders, in particular to a small-sized non-intrusive power grid wave recorder design method. BACKGROUND

[0002] A wave recorder is an automatic recording device for recording changes in electrical quantities and switching quantities before and after faults in a power system, and is used for accident analysis, protection action evaluation and system safety monitoring; a non-intrusive power grid wave recorder is a technical device for realizing power system waveform recording and analysis without directly accessing the measured circuit, and the core principle thereof is to capture subtle fluctuation characteristics of current and voltage through a collection device at a total power meter or a distribution box, and then realize device state monitoring and fault diagnosis.

[0003] The existing method for designing a non-intrusive power grid wave recorder is usually improvement in communication transmission of the wave recorder, for example, a conversion device is added, the conversion device is connected with the wave recorder and a communication network of a background respectively, so that the data of the wave recorder can be viewed remotely, this improvement can improve the data viewing distance of the wave recorder, but cannot effectively calibrate the data detected by the wave recorder, so that when the load in the power grid is complex, the superposition effect of the total current / voltage will affect the current / voltage of the circuit monitored by the wave recorder, the recognition accuracy of the wave recorder is reduced, and the circuit cannot be effectively monitored, for example, in the patent application with the publication number CN116846073A, a remote wave recorder viewing system is disclosed, the scheme is that the wave recorder screen cabinet is connected with the conversion device and communicates, the conversion device is connected with the auxiliary control background and communicates, the conversion device obtains the trip information sent by the wave recorder screen cabinet and sends the trip information to the auxiliary control background and the power network system respectively, and other improvements for designing a non-intrusive power grid wave recorder are usually improvements in wave recorder testing, and the data detected by the wave recorder cannot be effectively calibrated, so that when the load in the power grid is complex, the superposition effect of the total current / voltage will affect the current / voltage of the circuit monitored by the wave recorder, the recognition accuracy of the wave recorder is reduced, and the circuit cannot be effectively monitored, therefore, it is necessary to improve the existing non-intrusive power grid wave recorder design method. SUMMARY

[0004] The application aims to at least solve one of the technical problems in the prior art, by providing a small-sized non-intrusive power grid wave recorder design method, to solve the problem in the existing non-intrusive power grid wave recorder design method that the data detected by the wave recorder cannot be effectively calibrated, so that when the load in the power grid is complex, the superposition effect of the total current / voltage will affect the current / voltage of the circuit monitored by the wave recorder, the recognition accuracy of the wave recorder is reduced, and the circuit cannot be effectively monitored.

[0005] To achieve the above objectives, this application provides a design method for a miniaturized, non-intrusive power grid recorder, comprising the following steps:

[0006] The historical current and voltage data corresponding to the circuit analyzed by the waveform recorder are acquired and analyzed. Based on the analysis results, single-circuit sampling is performed, and the single-circuit characteristics corresponding to the circuit are obtained based on the single-circuit sampling results.

[0007] The circuit is connected to the power grid where the circuit is located, and the power grid joint sampling is performed based on the single circuit characteristics of the circuit. The power grid circuit characteristics of the circuit are obtained based on the sampling results. The power grid circuit characteristics include the test voltage and the in-grid reference curves corresponding to the analyzable curves of all test voltages.

[0008] The circuit is sampled in real time using a waveform recorder, and real-time current curves and real-time voltage curves are generated in the hybrid analysis coordinate system based on the sampled real-time data. The real-time current curves and real-time voltage curves are analyzed based on the characteristics of the power grid circuit, and the real-time current curves are calibrated.

[0009] Furthermore, single-circuit sampling includes:

[0010] The circuit analyzed using a waveform recorder is denoted as the analysis circuit; a Cartesian coordinate system is established and denoted as the hybrid analysis coordinate system, where the unit of the X-axis of the hybrid analysis coordinate system is time, and the unit of the Y-axis is A or V;

[0011] Acquire historical current and voltage data of the analysis circuit in the power grid, and plot the corresponding curves in the hybrid analysis coordinate system with units of A and V on the Y-axis, respectively, and denot them as historical current curve and historical voltage curve.

[0012] Furthermore, single-circuit sampling also includes:

[0013] The interval formed by the maximum and minimum values ​​of the vertical axis in the historical current curve is denoted as the passable current interval, and the interval formed by the maximum and minimum values ​​of the vertical axis in the historical voltage curve is denoted as the passable voltage interval.

[0014] Furthermore, single-circuit sampling also includes:

[0015] Randomly select a voltage within the passable voltage range and record it as the test voltage; disconnect the analysis circuit from the power grid and adjust the potential difference across the analysis circuit to the test voltage; use a waveform recorder to sample the analysis circuit and pass a current of value α1 through the analysis circuit. Every k seconds, increase the current in the analysis circuit by α2 until the current in the analysis circuit is α3, where α1 and α3 are the minimum and maximum values ​​in the passable current range, respectively, and α1 + k × α2 = α3.

[0016] Furthermore, single-circuit sampling also includes:

[0017] In the hybrid analysis coordinate system, obtain the curve corresponding to the current increase from α1 to α3 in the analysis circuit, and record it as the current increase curve corresponding to the test voltage; perform g random sampling in the passable voltage range, obtain the current increase curve of the test voltage corresponding to each sampling, and record all the sampled test voltages and all the current increase curves of the test voltages as single circuit characteristics.

[0018] Furthermore, the analysis circuit is connected to the power grid where it is located. With the power grid operating normally, a waveform recorder is used to collect the current and voltage data corresponding to the analysis circuit. The collected results are recorded as power grid characteristic data, and joint power grid sampling is performed. Joint power grid sampling includes:

[0019] For any test voltage: In the power grid characteristic data, the data where the potential difference across the analysis circuit is the test voltage is recorded as the control analysis data; Plot the curve corresponding to the current in the control analysis data in the hybrid analysis coordinate system and record it as the control current curve; Extract the monotonically increasing curves within the control current curve and record them as analyzable curves.

[0020] Furthermore, joint power grid sampling also includes:

[0021] For any analyzable curve, mark the ordinate of the leftmost point of the analyzable curve as the starting current, and place the analyzable curve and the current rise curve of the test voltage in the same coordinate system, wherein the leftmost point of the analyzable curve coincides with the point in the current rise curve whose ordinate is the starting current.

[0022] Draw a straight line parallel to the Y-axis at the rightmost point of the analyzable curve and denote it as the limit line; denote the intersection of the limit line and the current boost curve as the right limit point, and denote the curve between the point in the current boost curve whose ordinate is the starting current and the right limit point as the in-network reference curve, where the time corresponding to the horizontal span of the in-network reference curve is denoteed as T.

[0023] Furthermore, the joint sampling of the power grid also includes: acquiring all analyzable curves corresponding to all test voltages, and acquiring the intra-grid reference curves corresponding to all analyzable curves based on the current boost curve of each test voltage.

[0024] Furthermore, based on the characteristics of the power grid circuit, the real-time current curve and real-time voltage curve are analyzed, and the real-time current curve is calibrated, including:

[0025] The circuit is sampled in real time using a waveform recorder, and based on the sampled real-time data, the curves corresponding to the current and voltage are obtained in the hybrid analysis coordinate system, and are recorded as the real-time current curve and the real-time voltage curve, respectively.

[0026] For any moment Z during which data acquisition is performed and the current in the analysis circuit increases: mark the abscissa of Z as XX1 in the hybrid analysis coordinate system, and record the ordinate of the intersection of X = XX1 with the real-time current curve and the real-time voltage curve as the sampling current and sampling voltage, respectively, and execute step V.

[0027] When the current in the analysis circuit increases for a period of time from XX1 to XX1+T1, the curve with the horizontal axis from XX1 to XX1+T0 in the real-time current curve is replaced with a portable curve, and the sampling current and sampling voltage corresponding to XX1+T are obtained. Step V is repeated, where T1 is greater than or equal to T.

[0028] When the current in the analysis circuit increases for a period of time from XX1 to XX1+T2, the curve with the horizontal axis from XX1 to XX1+T2 in the real-time current curve is replaced with a curve with a length of T2 from left to right in the portable curve, and the replaced real-time current curve is fitted, where T2 is less than T.

[0029] Further, step V includes:

[0030] Obtain the test voltage with the smallest difference from the sampling voltage and denote it as U1; among all the current boost curves of U1, the curve with the smallest difference between the starting current and the sampling current is denoteed as the control boost curve; obtain the in-network control curve corresponding to the control current curve and denote it as the portable curve, and denote the T corresponding to the portable curve as T0.

[0031] The beneficial effects of this invention are as follows: This application first acquires and analyzes the historical current and voltage data corresponding to the circuit analyzed by the waveform recorder. Based on the analysis results, single-circuit sampling is performed, and the single-circuit characteristics corresponding to the circuit are obtained based on the single-circuit sampling results. The circuit is then connected to the power grid where the circuit is located, and power grid joint sampling is performed based on the single-circuit characteristics of the circuit. Based on the sampling results, the power grid circuit characteristics of the circuit are obtained. The advantage of this is that by performing single-circuit sampling and power grid joint sampling respectively, the state of the circuit when it is working alone and when it is working in the power grid can be analyzed separately. This allows for obtaining the characteristics corresponding to the current rise in the circuit under different voltage conditions. This enables the current data in the circuit to be calibrated based on the real-time rise of the current in the circuit when the circuit is working in the power grid, so as to prevent the problem of the waveform recorder's identification accuracy decreasing due to the influence of the complex power grid load on the current of the circuit detected and monitored by the waveform recorder.

[0032] This application also uses a waveform recorder to sample the circuit in real time, and generates real-time current curves and real-time voltage curves in a hybrid analysis coordinate system based on the sampled real-time data. The real-time current curves and real-time voltage curves are analyzed based on the characteristics of the power grid circuit, and the real-time current curves are calibrated. The advantage of this is that by calibrating the real-time current curves based on the characteristics of the power grid circuit, the identification accuracy of the waveform recorder can be improved when the load in the power grid is complex, based on the actual current rise state of the circuit, so as to effectively monitor the circuit. Attached Figure Description

[0033] Figure 1 This is a flowchart of the steps of the method of the present invention;

[0034] Figure 2 This is a schematic diagram of the current boost curve of the present invention;

[0035] Figure 3 This is a schematic diagram of a monotonically increasing curve in the control current curve of the present invention.

[0036] Figure 4 This is a schematic diagram showing the analyzable curve and the current boost curve of the present invention placed in the same coordinate system;

[0037] Figure 5 This is a schematic diagram of the electronic device of the present invention. Detailed Implementation

[0038] 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 only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] Example 1, please refer to Figure 1 As shown, this application provides a design method for a miniaturized non-intrusive power grid recorder, comprising the following steps:

[0040] Step S1: Obtain and analyze the historical current and voltage data corresponding to the circuit to be analyzed by the waveform recorder, perform single-circuit sampling based on the analysis results, and obtain the single-circuit characteristics corresponding to the circuit based on the single-circuit sampling results.

[0041] Single-circuit sampling includes: step S101, the circuit analyzed using a waveform recorder is denoted as the analysis circuit; a plane rectangular coordinate system is established and denoted as the hybrid analysis coordinate system, wherein the unit of the X-axis of the hybrid analysis coordinate system is time, and the unit of the Y-axis is A or V;

[0042] Step S102: Obtain historical current data and historical voltage data of the analysis circuit in the power grid, and draw the corresponding curves in the hybrid analysis coordinate system when the units of the Y-axis are set to A and V respectively, and record them as historical current curve and historical voltage curve respectively.

[0043] In the specific implementation process, when there is a lot of current and voltage data corresponding to the analysis circuit, the maximum and minimum values ​​recorded in the historical current and voltage data can be obtained respectively, and the current and voltage data corresponding to the analysis circuit can be truncated to ensure that the historical current and voltage data contain the maximum current, maximum voltage, minimum current and minimum voltage corresponding to the analysis circuit. This achieves the goal of more comprehensive analysis of the analysis circuit while reducing the data analysis pressure and improving the data analysis efficiency.

[0044] Step S103: The interval formed by the maximum and minimum values ​​of the vertical axis in the historical current curve is recorded as the current-passing interval, and the interval formed by the maximum and minimum values ​​of the vertical axis in the historical voltage curve is recorded as the voltage-passing interval.

[0045] Step S104: Randomly obtain a voltage within the passable voltage range and record it as the test voltage; disconnect the analysis circuit from the power grid and adjust the potential difference across the analysis circuit to the test voltage; use a waveform recorder to sample the analysis circuit and pass a current of value α1 through the analysis circuit. Every k seconds, increase the current in the analysis circuit by α2 until the current in the analysis circuit is α3, where α1 and α3 are the minimum and maximum values ​​in the passable current range, respectively, and α1 + k × α2 = α3;

[0046] In the specific implementation process, the value of k can be determined according to the length of the actual passable voltage range. When the length of the passable voltage range is large, the value of k can be increased, and when the length of the passable voltage range is small, the value of k can be decreased. The larger k is, the more likely it is to be. In this embodiment, the value of k is set to 5. For example, in a data analysis, the test voltage obtained is 10V, and the corresponding passable voltage range is [5A, 10A]. Then, through analysis, we can find that α1 is 5A, α3 is 10A, and α2 is 1A.

[0047] Step S105: Obtain the curve corresponding to the increase of current in the analysis circuit from α1 to α3 in the hybrid analysis coordinate system, and record it as the current increase curve corresponding to the test voltage; perform g random sampling in the passable voltage range, obtain the current increase curve of the test voltage corresponding to each sampling, and record all the sampled test voltages and all the current increase curves of the test voltages as single circuit features.

[0048] In a specific implementation process, for example during a data analysis, the current boost curve plotted based on the data obtained in this embodiment is as follows: Figure 2 As shown by curve DT, this illustrates that when the analysis circuit operates independently at a voltage of 10V, the current rises as follows: Figure 2 As shown by the curve, it can be referred to Figure 2 The current rise curve in the analysis circuit is calibrated when the circuit is connected to the power grid and the potential difference between its two ends is 10V, in order to improve the accuracy of the waveform recorder in monitoring the circuit.

[0049] Step S2: Connect the circuit to the power grid where the circuit is located, and perform joint sampling of the power grid based on the single circuit characteristics of the circuit, and obtain the power grid circuit characteristics of the circuit based on the sampling results. The power grid circuit characteristics include the test voltage and the in-grid reference curves corresponding to the analyzable curves of all test voltages.

[0050] Connect the analysis circuit to the power grid where it is located, operate the power grid normally, and use a waveform recorder to collect the current and voltage data corresponding to the analysis circuit. Record the collected results as power grid characteristic data, and perform joint power grid sampling, which includes:

[0051] Step S201: For any test voltage: Record the data in the power grid characteristic data where the potential difference across the analysis circuit is the test voltage as the reference analysis data; plot the curve corresponding to the current in the reference analysis data in the mixed analysis coordinate system and record it as the reference current curve; extract the monotonically increasing curves within the reference current curve and record them as analyzable curves.

[0052] The joint sampling of the power grid also includes: step S202, for any analyzable curve, the ordinate of the leftmost point of the analyzable curve is marked as the starting current, and the analyzable curve and the current rise curve of the test voltage are placed in the same coordinate system, wherein the leftmost point of the analyzable curve coincides with the point in the current rise curve whose ordinate is the starting current.

[0053] In specific implementation, for example, during a data analysis, the obtained test voltage is 10V, and a monotonically increasing segment of the obtained control current curve is shown below. Figure 3 As shown by curve KF, curve KF can be denoted as the analyzable curve. In addition, the current boost curve corresponding to a test voltage of 10V is... Figure 2 For curve DT, after placing curve KF and curve DT in the same coordinate system, as shown... Figure 4 As shown, point QD is the leftmost point of the analyzable curve KF, 6A is the starting current, point YD is the right limit point, the curve WD between point QD and point YD is the intra-network reference curve, and the difference between TT1 and TT2 is the time corresponding to the horizontal span of the intra-network reference curve.

[0054] Step S203: Draw a straight line parallel to the Y-axis at the rightmost point of the analyzable curve and record it as the limit line; record the intersection of the limit line and the current boost curve as the right limit point, and record the curve between the point in the current boost curve with the starting current as the ordinate and the right limit point as the in-network reference curve, wherein the time corresponding to the horizontal span of the in-network reference curve is recorded as T.

[0055] Step S204: Obtain all analyzable curves corresponding to all test voltages, and obtain the intra-network reference curves corresponding to all analyzable curves based on the current boost curve of each test voltage.

[0056] Step S3: Use a waveform recorder to sample the circuit in real time, and plot the real-time current curve and the real-time voltage curve in the hybrid analysis coordinate system based on the sampled real-time data; analyze the real-time current curve and the real-time voltage curve based on the characteristics of the power grid circuit, and calibrate the real-time current curve.

[0057] Step S3 includes: Step S301, using a waveform recorder to sample the circuit in real time, and based on the real-time data obtained from the sampling, acquiring the curves corresponding to the current and voltage in the mixed analysis coordinate system, and recording them as the real-time current curve and the real-time voltage curve, respectively.

[0058] Step S302: For any moment Z during which data acquisition is performed and the current in the analysis circuit increases: Mark the abscissa of Z as XX1 in the hybrid analysis coordinate system, and record the ordinate of the intersection of X=XX1 with the real-time current curve and the real-time voltage curve as the sampling current and sampling voltage, respectively, and execute step V.

[0059] Step S303: When the time for the current to increase in the analysis circuit increases from XX1 to XX1+T1, the curve with the horizontal axis from XX1 to XX1+T0 in the real-time current curve is replaced with a portable curve, and the sampling current and sampling voltage corresponding to XX1+T are obtained. Step V is repeated, where T1 is greater than or equal to T.

[0060] In the specific implementation process, for example, during a data analysis, if the value of T0 is 10s and the current in the analysis circuit increases for 9s, then the curve with the horizontal axis from XX1 to XX1+9s in the real-time current curve can be replaced with the curve from left to right for 9s in the portable curve, and the sampling current and sampling voltage of the analysis circuit at XX1+9s can be obtained. Step V is repeated to ensure continuous calibration of the subsequent current data of the analysis circuit.

[0061] Step S304: When the time for the current to increase in the analysis circuit continues from XX1 to XX1+T2, the curve with the horizontal axis from XX1 to XX1+T2 in the real-time current curve is replaced with a curve with a length of T2 from left to right in the portable curve, and the replaced real-time current curve is fitted, where T2 is less than T.

[0062] Step V includes: obtaining the test voltage with the smallest difference from the sampling voltage and recording it as U1; recording the curve with the smallest difference between the starting current and the sampling current among all current boost curves of U1 as the control boost curve; obtaining the in-network control curve corresponding to the control current curve and recording it as the portable curve; and recording the T corresponding to the portable curve as T0.

[0063] Example 2, please refer to Figure 5 As shown, Figure 5 A schematic diagram of an electronic device is provided, which may include a processor, a communication interface, a memory, and a communication bus. The processor, communication interface, and memory communicate with each other via the communication bus. The memory stores computer-readable instructions, and the processor can call these instructions. When the processor executes a computer-readable instruction, it performs steps as described in a miniaturized non-intrusive power grid recorder design method to achieve the following functions: First, it acquires and analyzes historical current and voltage data corresponding to the circuit being analyzed by the recorder; based on the analysis results, it performs single-circuit sampling and obtains the single-circuit characteristics of the circuit based on the sampling results; then, it connects the circuit to the power grid where the circuit is located and performs joint power grid sampling based on the single-circuit characteristics of the circuit, obtaining the power grid circuit characteristics of the circuit based on the sampling results; finally, it uses the recorder to sample the circuit in real time and generates real-time current and voltage curves in a hybrid analysis coordinate system based on the sampled real-time data; it analyzes the real-time current and voltage curves based on the power grid circuit characteristics and calibrates the real-time current curve.

[0064] Furthermore, the logical instructions in the aforementioned memory can be implemented as software functional units and sold or used as independent products, and can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0065] Example 3: This application also provides a computer program product, which includes a computer program stored on a computer-readable storage medium. The computer program includes program instructions. When the program instructions are executed by a computer, the computer can execute a miniaturized non-intrusive power grid recorder design method provided by the above methods. The method includes: firstly, acquiring and analyzing historical current data and historical voltage data corresponding to the circuit analyzed by the recorder; performing single-circuit sampling based on the analysis results; and obtaining single-circuit characteristics corresponding to the circuit based on the single-circuit sampling results; then connecting the circuit to the power grid where the circuit is located, performing joint power grid sampling based on the single-circuit characteristics of the circuit, and obtaining the power grid circuit characteristics of the circuit based on the sampling results; finally, using the recorder to sample the circuit in real time, and generating real-time current curves and real-time voltage curves in a hybrid analysis coordinate system based on the sampled real-time data; analyzing the real-time current curves and real-time voltage curves based on the power grid circuit characteristics, and calibrating the real-time current curves.

[0066] Example 4: This application also provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, it performs the steps described above in the design method for a miniaturized non-intrusive power grid recorder to achieve the following functions: First, it acquires and analyzes historical current and voltage data corresponding to the circuit being analyzed by the recorder; based on the analysis results, it performs single-circuit sampling and obtains the single-circuit characteristics corresponding to the circuit based on the single-circuit sampling results; then, it connects the circuit to the power grid where the circuit is located, performs joint sampling of the power grid based on the single-circuit characteristics of the circuit, and obtains the power grid circuit characteristics of the circuit based on the sampling results; finally, it uses the recorder to sample the circuit in real time, and obtains real-time current curves and real-time voltage curves in a hybrid analysis coordinate system based on the sampled real-time data; it analyzes the real-time current curves and real-time voltage curves based on the power grid circuit characteristics, and calibrates the real-time current curves.

[0067] Based on the above description of the embodiments, the embodiments of the present invention can be provided as methods, systems, or computer program products. Based on this understanding, the technical solutions described above, or the parts that contribute to the prior art, can be embodied in the form of software products. These computer software products can be stored in computer-readable storage media, such as ROM / RAM, magnetic disks, optical disks, etc., and include several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or certain parts of the embodiments.

[0068] In the embodiments provided in this application, it should be understood that the disclosed system or method can be implemented in other ways. The embodiments described above are merely illustrative. For example, the division of modules or units is only a logical functional division, and there may be other division methods in actual implementation. Furthermore, multiple modules or units may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the coupling or direct coupling or communication connection shown or discussed may be through some communication interfaces. The indirect coupling or communication connection between systems, modules, and units may be electrical, mechanical, or other forms.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application 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. Such 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 this application.

Claims

1. A design method for a miniaturized, non-intrusive power grid recorder, characterized in that, Includes the following steps: The historical current and voltage data corresponding to the circuit analyzed by the waveform recorder are acquired and analyzed. Based on the analysis results, single-circuit sampling is performed, and the single-circuit characteristics corresponding to the circuit are obtained based on the single-circuit sampling results. The circuit is connected to the power grid where the circuit is located, and the power grid joint sampling is performed based on the single circuit characteristics of the circuit. The power grid circuit characteristics of the circuit are obtained based on the sampling results. The power grid circuit characteristics include the test voltage and the in-grid reference curves corresponding to the analyzable curves of all test voltages. The circuit is sampled in real time using a waveform recorder, and real-time current curves and real-time voltage curves are generated in the hybrid analysis coordinate system based on the sampled real-time data. The real-time current curves and real-time voltage curves are analyzed based on the characteristics of the power grid circuit, and the real-time current curves are calibrated.

2. The design method for a miniaturized non-intrusive power grid recorder according to claim 1, characterized in that, Single-circuit sampling includes: The circuit analyzed using a waveform recorder is denoted as the analysis circuit; a Cartesian coordinate system is established and denoted as the hybrid analysis coordinate system, where the unit of the X-axis of the hybrid analysis coordinate system is time, and the unit of the Y-axis is A or V; Acquire historical current and voltage data of the analysis circuit in the power grid, and plot the corresponding curves in the hybrid analysis coordinate system with units of A and V on the Y-axis, respectively, and denot them as historical current curve and historical voltage curve.

3. The design method for a miniaturized non-intrusive power grid recorder according to claim 2, characterized in that, Single-circuit sampling also includes: The interval formed by the maximum and minimum values ​​of the vertical axis in the historical current curve is denoted as the passable current interval, and the interval formed by the maximum and minimum values ​​of the vertical axis in the historical voltage curve is denoted as the passable voltage interval.

4. The design method of a miniaturized non-intrusive power grid recorder according to claim 3, characterized in that, Single-circuit sampling also includes: Randomly select a voltage within the passable voltage range and record it as the test voltage; disconnect the analysis circuit from the power grid and adjust the potential difference across the analysis circuit to the test voltage; use a waveform recorder to sample the analysis circuit and pass a current of value α1 through the analysis circuit. Every k seconds, increase the current in the analysis circuit by α2 until the current in the analysis circuit is α3, where α1 and α3 are the minimum and maximum values ​​in the passable current range, respectively, and α1 + k × α2 = α3.

5. The design method of a miniaturized non-intrusive power grid recorder according to claim 4, characterized in that, Single-circuit sampling also includes: In the hybrid analysis coordinate system, obtain the curve corresponding to the current increase from α1 to α3 in the analysis circuit, and record it as the current increase curve corresponding to the test voltage; perform g random sampling in the passable voltage range, obtain the current increase curve of the test voltage corresponding to each sampling, and record all the sampled test voltages and all the current increase curves of the test voltages as single circuit characteristics.

6. The design method of a miniaturized non-intrusive power grid recorder according to claim 5, characterized in that, Connect the analysis circuit to the power grid where it is located, operate the power grid normally, and use a waveform recorder to collect the current and voltage data corresponding to the analysis circuit. Record the collected results as power grid characteristic data, and perform joint power grid sampling, which includes: For any test voltage: In the power grid characteristic data, the data where the potential difference across the analysis circuit is the test voltage is recorded as the control analysis data; Plot the curve corresponding to the current in the control analysis data in the hybrid analysis coordinate system and record it as the control current curve; Extract the monotonically increasing curves within the control current curve and record them as analyzable curves.

7. The design method for a miniaturized non-intrusive power grid recorder according to claim 6, characterized in that, Joint power grid sampling also includes: For any analyzable curve, mark the ordinate of the leftmost point of the analyzable curve as the starting current, and place the analyzable curve and the current rise curve of the test voltage in the same coordinate system, wherein the leftmost point of the analyzable curve coincides with the point in the current rise curve whose ordinate is the starting current. Draw a straight line parallel to the Y-axis at the rightmost point of the analyzable curve and denote it as the limit line; denote the intersection of the limit line and the current boost curve as the right limit point, and denote the curve between the point in the current boost curve whose ordinate is the starting current and the right limit point as the in-network reference curve, where the time corresponding to the horizontal span of the in-network reference curve is denoteed as T.

8. The design method of a miniaturized non-intrusive power grid recorder according to claim 7, characterized in that, The joint sampling of the power grid also includes: obtaining all analyzable curves corresponding to all test voltages, and obtaining the intra-grid reference curves corresponding to all analyzable curves based on the current boost curve of each test voltage.

9. A design method for a miniaturized non-intrusive power grid recorder according to claim 8, characterized in that, Based on the characteristics of the power grid circuit, the real-time current curve and real-time voltage curve are analyzed, and the real-time current curve is calibrated, including: The circuit is sampled in real time using a waveform recorder, and based on the sampled real-time data, the curves corresponding to the current and voltage are obtained in the hybrid analysis coordinate system, and are recorded as the real-time current curve and the real-time voltage curve, respectively. For any moment Z during which data acquisition is performed and the current in the analysis circuit increases: mark the abscissa of Z as XX1 in the hybrid analysis coordinate system, and record the ordinate of the intersection of X = XX1 with the real-time current curve and the real-time voltage curve as the sampling current and sampling voltage, respectively, and execute step V. When the current in the analysis circuit increases for a period of time from XX1 to XX1+T1, the curve with the horizontal axis from XX1 to XX1+T0 in the real-time current curve is replaced with a portable curve, and the sampling current and sampling voltage corresponding to XX1+T are obtained. Step V is repeated, where T1 is greater than or equal to T. When the current in the analysis circuit increases for a period of time from XX1 to XX1+T2, the curve with the horizontal axis from XX1 to XX1+T2 in the real-time current curve is replaced with a curve with a length of T2 from left to right in the portable curve, and the replaced real-time current curve is fitted, where T2 is less than T.

10. A design method for a miniaturized non-intrusive power grid recorder according to claim 9, characterized in that, Step V includes: Obtain the test voltage with the smallest difference from the sampling voltage and denote it as U1; among all the current boost curves of U1, the curve with the smallest difference between the starting current and the sampling current is denoteed as the control boost curve; obtain the in-network control curve corresponding to the control current curve and denote it as the portable curve, and denote the T corresponding to the portable curve as T0.

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