Load detection method and system fused with secondary current loop

Abstract

The invention discloses a load detection method and system fused with a secondary current loop, and the method comprises the steps: obtaining the parameter information of a detected device, carrying out the excitation of a secondary loop in a power system through introducing an AC current source, and enabling the AC current source and the impedance of the detected device to form a closed loop together; through data acquisition equipment, voltage and current signals generated by a secondary circuit in an excitation state are acquired and measured in real time; analyzing and processing the acquired voltage and current signals through a digital signal processor to obtain amplitude and phase information of the voltage and current signals; based on the amplitude and phase information of the voltage and current signals, the secondary circuit load is calculated through a volt-ampere phase method. Voltage and current are formed in the secondary circuit, off-line detection of the circuit load is realized, the test efficiency is improved, and stable operation of the secondary circuit system is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of power distribution protection, and in particular to a load detection method and system integrating a secondary current loop. Background Art

[0002] With the rapid development of my country's industry, the requirements for power supply quality are becoming higher and higher, and whether the power grid can operate safely and reliably is becoming more and more important. Especially in some economically developed areas, even a short power outage may cause very serious losses. The power grid is large in scale, covers a wide range, has a complex structure, and has many devices. The various devices need to work closely together, and failures and abnormal operations are inevitable during operation. If not handled and resolved in time, it may threaten personal safety and equipment safety, affecting the reliability and continuity of power supply at the least, and causing the scope of the fault to continue to expand, which may cause the collapse and decoupling of the entire system, causing serious losses to the national economy. In order to ensure that the power system can operate continuously and stably, the role of secondary circuit equipment is particularly critical. It can automatically, quickly and selectively cut off the fault point when a fault occurs, reduce the damage caused by the fault, and reduce the scope of the fault.

[0003] The secondary circuit load refers to the total impedance of the electrical instruments and connecting wires connected to the secondary circuit, which includes the impedance of these instruments or relays, as well as the resistance of the connecting wires and the contact resistance of the connection points, and all other impedances of the secondary external loads. The secondary load must be within the range of the rated load and the lower limit load. If the secondary load actually connected to the transformer and other equipment is greater than the rated load or less than the lower limit load, its accuracy will not be guaranteed, and the error will exceed the allowable value specified by the national standard. In addition, the power factor of the secondary load also affects the error. The reliability of the secondary circuit operation is crucial to the correct operation of the relay protection and safety and automatic devices. If it is not discovered in time, it may cause the protection or safety and automatic devices to operate incorrectly.

[0004] Currently, in the secondary circuit load test, the existing technology can only test the secondary circuit load in operation. It is impossible to inspect the secondary circuit before operation after maintenance and restoration, and it is impossible to completely eliminate hidden dangers, which affects the safe operation of the secondary current circuit. Summary of the invention

[0005] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0006] In view of the above existing problems, the present invention is proposed.

[0007] Therefore, the present invention provides a load detection method and system integrating a secondary current loop to solve the problem in the prior art that the line cannot be inspected before the secondary loop is put into operation after maintenance and restoration.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0009] In a first aspect, the present invention provides a load detection method integrating a secondary current loop, comprising:

[0010] Obtain parameter information of the detected device, and stimulate the secondary circuit in the power system by introducing an AC current source. The AC current source and the impedance of the detected device together form a closed loop;

[0011] The voltage and current signals generated by the secondary circuit in the excitation state are collected and measured in real time through data acquisition equipment;

[0012] The collected voltage and current signals are analyzed and processed by a digital signal processor to obtain the amplitude and phase information of the voltage and current signals;

[0013] Based on the amplitude and phase information of the voltage and current signals, the secondary circuit load is calculated using the volt-ampere phase method.

[0014] As a preferred solution of the load detection method for integrating the secondary current loop described in the present invention, wherein:

[0015] The introducing of the alternating current source comprises the following steps:

[0016] The battery voltage is increased to a DC high voltage through a DC / DC boost module.

[0017] The boosted DC voltage is input into a full-bridge full-wave high-frequency inverter circuit to convert the DC voltage into an AC current with controllable effective value, thereby obtaining the AC current source required for the secondary circuit test.

[0018] As a preferred solution of the load detection method for integrating the secondary current loop described in the present invention, wherein:

[0019] The voltage and current signals generated by the secondary circuit in the excitation state are collected and measured in real time, including designing a bandpass filter with a center frequency of 50 Hz to remove high-order harmonics and DC signals to obtain smooth periodic voltage and current signals.

[0020] As a preferred solution of the load detection method for integrating the secondary current loop described in the present invention, wherein:

[0021] The method of analyzing and processing the collected voltage and current signals by a digital signal processor to obtain the amplitude and phase information of the voltage and current signals includes the following steps:

[0022] Convert analog signals into digital signals;

[0023] Perform discrete Fourier transform on the sampled digital signal, convert the time domain signal into a frequency domain signal, and extract the frequency component of the signal;

[0024] The amplitude and phase information of the voltage and current signals are extracted from the DFT results.

[0025] As a preferred solution of the load detection method for integrating the secondary current loop described in the present invention, wherein:

[0026] The step of extracting the amplitude and phase information of the voltage and current signals from the DFT result comprises the following steps:

[0027] The signal to be measured f is sampled by A / D to obtain a discrete time signal f(n), and the frequency domain signal F(k) is calculated by discrete Fourier transform;

[0028] f(n) and F(k) are a Fourier transform pair;

[0029] The time domain signal x(n) converted back from the frequency domain signal is obtained by weighted sum of the harmonics of the periodic signal;

[0030] By converting the frequency domain signal back to the time domain signal x(n), the coefficient X(k) of each harmonic is obtained;

[0031] After performing the discrete Fourier transform operation, the real part a of the complex signal is obtained. n and the imaginary part b n ;

[0032] The phase of each harmonic is arctan(a n / b n ), n = 1, the phase of the signal fundamental wave is obtained;

[0033] At the same time, N points are sampled for the A-path and B-path signals, and the fundamental wave phases of the A-path and B-path signals are calculated respectively. The phases of the two signals are subtracted to obtain the phase difference between the A-path and B-path signals.

[0034] As a preferred solution of the load detection method for integrating the secondary current loop described in the present invention, wherein:

[0035] The frequency domain signal F(k) obtained by discrete Fourier transform calculation is expressed as:

[0036]

[0037] Wherein, N is the length of the transformation interval.

[0038] As a preferred solution of the load detection method for integrating the secondary current loop described in the present invention, wherein:

[0039] The discrete time signal f(n) obtained by A / D sampling is expressed as:

[0040]

[0041] In a second aspect, the present invention provides a load detection system integrating a secondary current loop, comprising:

[0042] The control current source module is used to obtain parameter information of the detected device. By introducing an AC current source, the secondary circuit in the power system is excited. The AC current source and the impedance of the detected device together form a closed loop.

[0043] A data acquisition module is used to collect and measure the voltage and current signals generated by the secondary circuit in an excitation state in real time through a data acquisition device;

[0044] The calculation and analysis module is used to analyze and process the collected voltage and current signals through a digital signal processor to obtain the amplitude and phase information of the voltage and current signals;

[0045] The secondary load calculation output module is used to calculate the secondary circuit load through the volt-ampere phase method based on the amplitude and phase information of the voltage and current signals.

[0046] In a third aspect, the present invention provides a computing device, comprising:

[0047] Memory, used to store programs;

[0048] The processor is used to execute the computer executable instructions, and the computer executable instructions, when executed by the processor, implement the steps of the load detection method for the integrated secondary current loop.

[0049] In a fourth aspect, the present invention provides a computer-readable storage medium, comprising: when the program is executed by a processor, the steps of implementing the load detection method of the fused secondary current loop are implemented.

[0050] Beneficial effects of the present invention: The present invention uses a testing method of an externally applied highly stable AC current source to form a closed loop with the impedance of the device being tested, thereby forming voltage and current in the secondary circuit, realizing offline detection of the circuit load, improving testing efficiency, and ensuring stable operation of the secondary circuit system. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. 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 labor. Among them:

[0052] Figure 1 A basic flow chart of a load detection method integrating a secondary current loop provided by an embodiment of the present invention;

[0053] Figure 2 A diagram of a secondary circuit load test device integrating a load detection method of a secondary current circuit provided by an embodiment of the present invention;

[0054] Figure 3 A device test wiring diagram for a load detection method integrating a secondary current loop is provided in accordance with an embodiment of the present invention. DETAILED DESCRIPTION

[0055] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0056] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0057] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0058] The present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0059] At the same time, in the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper, lower, inner and outer" are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first, second or third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0060] In the present invention, unless otherwise clearly specified and limited, the terms "install, connect, connect" should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection or an integral connection; it can also be a mechanical connection, an electrical connection or a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] Example 1

[0062] Reference Figure 1 , is an embodiment of the present invention, and provides a load detection method integrating a secondary current loop, such as Figure 1 As shown, the following steps are included:

[0063] S1: Obtain parameter information of the device under test, and stimulate the secondary circuit in the power system by introducing an AC current source. The AC current source and the impedance of the device under test together form a closed loop;

[0064] In the embodiment of the present application, a high-precision AC current source is designed in this scheme: first, the battery voltage is converted from a low battery voltage into a DC high voltage through a DC / DC DC boost module; then, the DC voltage is input into a full-bridge full-wave high-frequency inverter circuit. The function of the full-bridge full-wave high-frequency inverter circuit is to convert the DC voltage into an effective value of a controllable AC current to obtain the AC current required for the secondary circuit test.

[0065] S2: The voltage and current signals generated by the secondary circuit in the excitation state are collected and measured in real time through data acquisition equipment;

[0066] In an embodiment of the present application, the voltage and current signals generated by the secondary circuit in the excitation state are collected and measured in real time, including designing a bandpass filter with a center frequency of 50 Hz to remove high-order harmonics and DC signals to obtain smooth periodic voltage and current signals.

[0067] S3: Analyze and process the collected voltage and current signals through a digital signal processor to obtain the amplitude and phase information of the voltage and current signals;

[0068] In the embodiment of the present application, the collected voltage and current signals are analyzed and processed by a digital signal processor to obtain the amplitude and phase information of the voltage and current signals, including the following steps:

[0069] Convert analog signals into digital signals;

[0070] Perform discrete Fourier transform on the sampled digital signal, convert the time domain signal into a frequency domain signal, and extract the frequency component of the signal;

[0071] The amplitude and phase information of the voltage and current signals are extracted from the DFT results.

[0072] In an embodiment of the present application, extracting the amplitude and phase information of the voltage and current signals from the DFT results includes the following steps:

[0073] The signal to be measured f is sampled by A / D to obtain a discrete time signal f(n), and the frequency domain signal F(k) is calculated by discrete Fourier transform;

[0074] f(n) and F(k) are a Fourier transform pair;

[0075] The time domain signal x(n) converted back from the frequency domain signal is obtained by weighted sum of the harmonics of the periodic signal;

[0076] By converting the frequency domain signal back to the time domain signal x(n), the coefficient X(k) of each harmonic is obtained;

[0077] After performing the discrete Fourier transform operation, the real part a of the complex signal is obtained. n and the imaginary part b n ;

[0078] The phase of each harmonic is arctan(a n / b n ), n = 1, the phase of the signal fundamental wave is obtained;

[0079] At the same time, N points are sampled for the A-path and B-path signals, and the fundamental wave phases of the A-path and B-path signals are calculated respectively. The phases of the two signals are subtracted to obtain the phase difference between the A-path and B-path signals.

[0080] In the embodiment of the present application, the frequency domain signal F(k) obtained by discrete Fourier transform calculation is expressed as:

[0081]

[0082] Wherein, N is the length of the transformation interval.

[0083] In the embodiment of the present application, the discrete time signal f(n) obtained by A / D sampling is expressed as:

[0084]

[0085] S4: Based on the amplitude and phase information of the voltage and current signals, the secondary circuit load is calculated by the volt-ampere phase method.

[0086] This embodiment also provides a load detection system integrating a secondary current loop, including:

[0087] The control current source module is used to obtain parameter information of the detected device. By introducing an AC current source, the secondary circuit in the power system is excited. The AC current source and the impedance of the detected device together form a closed loop.

[0088] A data acquisition module is used to collect and measure the voltage and current signals generated by the secondary circuit in an excitation state in real time through a data acquisition device;

[0089] The calculation and analysis module is used to analyze and process the collected voltage and current signals through a digital signal processor to obtain the amplitude and phase information of the voltage and current signals;

[0090] The secondary load calculation output module is used to calculate the secondary circuit load through the volt-ampere phase method based on the amplitude and phase information of the voltage and current signals.

[0091] Furthermore, it also includes:

[0092] Memory, used to store programs;

[0093] A processor is used to load the program to execute the load detection method of the fused secondary current loop.

[0094] This embodiment also provides a computer-readable storage medium storing a program, and when the program is executed by a processor, the load detection method of the fused secondary current loop is implemented.

[0095] The storage medium proposed in this embodiment and the load detection method integrating the secondary current loop proposed in the above embodiment belong to the same inventive concept. The technical details not fully described in this embodiment can be referred to the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.

[0096] Through the above description of the implementation methods, the technicians in the relevant field can clearly understand that the present invention can be implemented by means of software and necessary general hardware, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ReadOnly, Memory, ROM), random access memory (RandomAccess Memory, RAM), flash memory (FLASH), hard disk or optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform the methods of various embodiments of the present invention.

[0097] Example 2

[0098] Reference Figure 2-3 , which is another embodiment of the present invention, provides a load detection system integrating a secondary current loop, including a control current source module, a data acquisition module, a calculation and analysis module, and a secondary load calculation output module.

[0099] In the embodiment of the present application, the control current source module includes a high-precision AC current source as a power supply module output by the test;

[0100] In an embodiment of the present application, the design of a high-precision AC current source includes converting the low voltage of the battery into a high DC voltage through a DC / DC DC boost module; inputting the DC voltage into a full-bridge full-wave high-frequency inverter circuit. The function of the full-bridge full-wave high-frequency inverter circuit is to convert the DC voltage into an effective value of a controllable AC current to obtain the AC current required for the secondary circuit test.

[0101] In the embodiments of the present application, Figure 2 As shown, the control current source module excites the terminal block of the secondary circuit of the detected device by applying a high-precision AC current source, and forms a closed loop with the impedance of the detected device. The data acquisition module collects and measures the voltage and current signals generated after the secondary circuit is excited. The DSP (digital signal processor) signal calculation and analysis module analyzes and processes the amplitude and phase of the voltage and current signals. The secondary load calculation output module calculates the secondary circuit load based on the volt-ampere phase method.

[0102] In the embodiments of the present application, Figure 3As shown, the data acquisition module includes a high-precision voltage acquisition module and a high-precision current acquisition module. The high-precision voltage acquisition module collects the voltage and current signals generated by the secondary circuit after the test power supply is connected through the voltage acquisition wiring and the current clamp wiring of the high-precision current acquisition module. The calculation and analysis module analyzes the measurements collected by the high-precision voltage acquisition module and the high-precision current acquisition module, and calculates the actual load value of the secondary circuit.

[0103] In the embodiment of the present application, the data acquisition module also includes the use of a digital bandpass filter and software synchronous sampling to improve the measurement accuracy. Software synchronous sampling eliminates the phase-locked link of the hardware circuit, has a simple structure, and avoids the complexity of the phase-locked loop design and debugging and the phenomenon of loss of lock. In order to reduce the synchronization error, a high-order digital bandpass filter is designed. The bandpass filter is designed, and the center frequency of the bandpass filter is designed to be 50Hz, so that the high-order harmonics and DC signals can be filtered out by the bandpass filter, and a smooth periodic signal is obtained after sampling and filtering by software and hardware.

[0104] In the embodiment of the present application, the calculation and analysis module includes a core control module, which controls the high-precision AC current source to output a 50 Hz AC current with adjustable amplitude. The output current is divided into multiple current gears such as 20A, 10A, 5A, 1A, 200mA and other different measurement gears to adapt to the test conditions of the secondary circuit. The high-precision data acquisition module collects the voltage and current signals in the secondary circuit. The high-precision data acquisition system is the core of the entire device, which ensures the stability of the measurement results and the key to repeatability. Afterwards, the collected signal is fed back to the DSP signal calculation and analysis and core control module. The data is subjected to bandpass filtering and DFT phase measurement method for amplitude and phase analysis, and finally the secondary circuit load test result is obtained through volt-ampere phase calculation.

[0105] In the embodiment of the present application, the calculation and analysis module also includes a method for measuring the phase based on the DFT (discrete Fourier transform) algorithm. The measured signal f is sampled by A / D to obtain f(n), and the spectrum F(k) is obtained by discrete Fourier transform. Then f(n) and F(k) are a pair of Fourier transform pairs, and N is the length of the transformation interval: It can be seen that the sequence x(n) obtained by sampling the periodic signal in the time domain is the weighted sum of the harmonics of the periodic signal. The coefficients X(k) of each harmonic can be calculated from the sampled sequence x(n). Since the kernel function of DFT is a complex sequence, the real part of the complex signal (denoted as a) will be obtained after performing the DFT operation. n ) and the imaginary part (denoted as b n ). The phase of each harmonic is arctan(a n / b n), where n=1, we get the phase of the fundamental wave of the required signal. At the same time, we sample N points for the A and B signals, calculate the fundamental wave phases of the A and B signals respectively, and subtract the phases of the two signals to get the phase difference of the A and B signals.

[0106] It should be noted that the reliability of secondary circuit operation is crucial to the correct operation of relay protection and safety devices. If it cannot be discovered in time, it may cause the protection or safety devices to operate incorrectly. At present, in the secondary circuit load test, the existing technology can only test the secondary circuit load in operation, and cannot test the secondary circuit before operation after maintenance and restoration, and cannot completely eliminate hidden dangers, which affects the safe operation of the secondary current circuit. The present invention connects the fixed detection tester to the secondary circuit terminal block of the detected device, outputs a highly stable AC current source on the terminal block, and forms a closed loop with the impedance of the detected device, and forms a voltage and current in the secondary circuit of the detected device. Then, by using a high-precision voltage acquisition module and a high-precision current acquisition module to measure the secondary circuit, the collected current and voltage are calculated and analyzed, and the actual load value of the secondary circuit is calculated, which can effectively improve the secondary circuit detection performance, thereby ensuring the secondary system metering and the correct operation of relay protection, and maintaining the stability of the system.

[0107] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A load detection method integrating a secondary current loop, characterized in that: include: Obtain parameter information of the detected device, and stimulate the secondary circuit in the power system by introducing an AC current source. The AC current source and the impedance of the detected device together form a closed loop; The voltage and current signals generated by the secondary circuit in the excitation state are collected and measured in real time through data acquisition equipment; The collected voltage and current signals are analyzed and processed by a digital signal processor to obtain the amplitude and phase information of the voltage and current signals; Based on the amplitude and phase information of the voltage and current signals, the secondary circuit load is calculated using the volt-ampere phase method.

2. The load detection method for integrating a secondary current loop according to claim 1, characterized in that: The introducing of the alternating current source comprises the following steps: The battery voltage is increased to a DC high voltage through a DC / DC boost module. The boosted DC voltage is input into a full-bridge full-wave high-frequency inverter circuit to convert the DC voltage into an AC current with controllable effective value, thereby obtaining the AC current source required for the secondary circuit test.

3. The load detection method for integrating a secondary current loop according to claim 1 or 2, characterized in that: The voltage and current signals generated by the secondary circuit in the excitation state are collected and measured in real time, including designing a bandpass filter with a center frequency of 50 Hz to remove high-order harmonics and DC signals to obtain smooth periodic voltage and current signals.

4. The load detection method for integrating a secondary current loop as claimed in claim 3, characterized in that: The method of analyzing and processing the collected voltage and current signals by a digital signal processor to obtain the amplitude and phase information of the voltage and current signals includes the following steps: Convert analog signals into digital signals; Perform discrete Fourier transform on the sampled digital signal, convert the time domain signal into a frequency domain signal, and extract the frequency component of the signal; The amplitude and phase information of the voltage and current signals are extracted from the DFT results.

5. The load detection method for integrating a secondary current loop as claimed in claim 4, characterized in that: The step of extracting the amplitude and phase information of the voltage and current signals from the DFT result comprises the following steps: The signal to be measured f is sampled by A / D to obtain a discrete time signal f(n), and the frequency domain signal F(k) is calculated by discrete Fourier transform; f(n) and F(k) are a Fourier transform pair; The time domain signal x(n) converted back from the frequency domain signal is obtained by weighted sum of the harmonics of the periodic signal; By converting the frequency domain signal back to the time domain signal x(n), the coefficient X(k) of each harmonic is obtained; After performing the discrete Fourier transform operation, the real part a of the complex signal is obtained. n and the imaginary part b n ; The phase of each harmonic is arctan(a n / b n ), n = 1, the phase of the signal fundamental wave is obtained; At the same time, N points are sampled for the A-path and B-path signals, and the fundamental wave phases of the A-path and B-path signals are calculated respectively. The phases of the two signals are subtracted to obtain the phase difference between the A-path and B-path signals.

6. The load detection method for integrating a secondary current loop as claimed in claim 5, characterized in that: The frequency domain signal F(k) obtained by discrete Fourier transform calculation is expressed as: Wherein, N is the length of the transformation interval.

7. The load detection method for integrating a secondary current loop as claimed in claim 6, characterized in that: The discrete time signal f(n) obtained by A / D sampling is expressed as:

8. A system based on the load detection method of the integrated secondary current loop according to claim 1, characterized in that: The control current source module is used to obtain parameter information of the detected device. By introducing an AC current source, the secondary circuit in the power system is excited. The AC current source and the impedance of the detected device together form a closed loop. A data acquisition module is used to collect and measure the voltage and current signals generated by the secondary circuit in an excitation state in real time through a data acquisition device; The calculation and analysis module is used to analyze and process the collected voltage and current signals through a digital signal processor to obtain the amplitude and phase information of the voltage and current signals; The secondary load calculation output module is used to calculate the secondary circuit load through the volt-ampere phase method based on the amplitude and phase information of the voltage and current signals.

9. An electronic device, characterized in that: include: Memory, used to store programs; A processor is used to load the program to execute the steps of the load detection method for integrating a secondary current loop as described in any one of claims 1 to 7.

10. A computer-readable storage medium storing a program, characterized in that: When the program is executed by a processor, the steps of the load detection method for a fused secondary current loop as described in any one of claims 1 to 7 are implemented.

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