Detection system and method for multi-channel digital signal acquisition and calculation device of transformer substation

Abstract

The invention discloses a detection system for a multi-channel digital signal acquisition and calculation device of a transformer substation, and discloses a detection method corresponding to the detection system for the multi-channel digital signal acquisition and calculation device of the transformer substation. According to the detection method of the transformer substation electric energy signal acquisition and calculation device, the transformer substation multi-channel digital electric energy signal acquisition and calculation device provides a detection means, and detection of functions such as the acquisition success rate, the digital metering accuracy and the online monitoring reliability of the transformer substation multi-channel digital electric energy signal acquisition and calculation device is achieved. And the monitoring of the substation electric energy signal acquisition and calculation device, the validity verification and the accuracy determination of the on-line monitoring function and the normative test of the data interface communication protocol of the detection device are facilitated for workers.

Description

Technical Field

[0001] The present invention relates to the technical field of substation data acquisition and detection, and particularly relates to a detection system and method for a multi-channel digital signal acquisition and calculation device of a substation. Background Art

[0002] The State Grid Corporation has proposed that the metering devices of substations need to realize the functions of managing parameters such as time periods and rates that can adapt to power trading policies in real time. Due to the advantages of collecting and centrally managing diverse metering data of substations, the multi-channel digital power signal acquisition and calculation technology, in the form of a "centralized acquisition device", has been adopted by the acquisition systems of intelligent substations in some regions of the State Grid as an acquisition technology. In the same year, the multi-channel digital power signal acquisition / calculation technology was combined with the on-line monitoring technology of substation metering devices, etc., and the on-line monitoring of substation metering devices was expanded in the "centralized metering device" and the "centralized acquisition device", and the on-line evaluation of the error of the substation metering device was completed. A new device integrating the functions of multi-channel digital signal acquisition and calculation of substations was formally born and gradually applied.

[0003] However, the prior art lacks the detection ability for multi-channel digital signal acquisition and calculation devices of substations. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a detection system for a multi-channel digital signal acquisition and calculation device of a substation, which is for the staff of the metering center of the power grid company or the staff of the production and manufacturing of power devices, and can calibrate the digital metering accuracy of the device, detect the effectiveness of the on-line monitoring function of the device, and at the same time detect the standardization of the data interface communication protocol of the device.

[0005] The present invention also provides a monitoring method and medium based on the above detection system for a multi-channel digital signal acquisition and calculation device of a substation.

[0006] The detection system for a multi-channel digital signal acquisition and calculation device of a substation according to the first aspect embodiment of the present invention is characterized by including:

[0007] A substation dynamic simulation unit, an error adjustment unit, a digital calibration unit, a detection result analysis unit, and a clock synchronization unit, wherein,

[0008] The substation dynamic simulation unit is connected to the digital calibration unit and is used to simulate various power flow situations of the substation;

[0009] The error adjustment unit is connected to the digital calibration unit, and the error adjustment unit is used to output a program-controlled signal to adjust the voltage and current ratio differences and phase differences in the digital calibration unit;

[0010] The detection result analysis unit is connected to the digital calibration unit. The detection result analysis unit can obtain the detection results transmitted from the digital calibration unit and generate a report.

[0011] The clock synchronization unit is respectively connected to the digital calibration unit and the device under test. The clock synchronization unit outputs a B-IRIG time synchronization signal for synchronizing the clocks of the device under test and the digital calibration unit to ensure the accuracy of the signals.

[0012] The digital calibration unit is used to acquire voltage and current signals, convert them into digital signals, and perform at least one of filtering the digital signals, calculating voltage or current, signal framing, and signal synchronization based on the clock signal and / or the programmed control signal. Finally, the processed digital signals are output.

[0013] The detection system of the substation multi-channel digital signal acquisition and calculation device according to the embodiment of the present invention can achieve the digital metering accuracy of the calibration device and monitor the multi-channel digital signal acquisition and calculation device through the units therein, providing a means for implementation.

[0014] According to some embodiments of the present invention, the substation dynamic simulation unit includes a three-phase programmed voltage source, a three-phase RLC load, current transformers, voltage transformers, transformers, switches, and cables. Among them,

[0015] The three-phase programmed voltage source serves as the power source for the three-phase incoming line 1 and the three-phase incoming line 2, and is used to simulate the power source in the power system.

[0016] The three-phase RLC load serves as the load of the II busbar outgoing line and is used to simulate the load in the power system.

[0017] The voltage transformers and current transformers are used to measure the platform voltage and current.

[0018] The transformer is used for voltage transformation and is used to simulate the transformer in the power system; various architectures of the power system are adjusted by closing the switches.

[0019] According to some embodiments of the present invention, the digital calibration unit includes an AD conversion module, a signal processing module, an Ethernet output module, a signal comparison module, and a time synchronization module. Among them,

[0020] The AD conversion module is composed of a digital acquisition board card and is used to complete the conversion of voltage and current signals into digital signals.

[0021] The signal processing module is composed of an FPGA and is used to complete functions such as signal filtering, voltage or current calculation, signal framing, and signal synchronization.

[0022] The Ethernet output module has a Gigabit Ethernet interface for forwarding digital signals;

[0023] The signal comparison module includes a three-phase voltage / current transformer calibrator for calibrating the accuracy of the device under test;

[0024] The time synchronization module includes a synchronous clock for receiving an external clock signal and performing time synchronization.

[0025] According to the detection method of the substation multi-channel digital signal acquisition and calculation device according to the second aspect embodiment of the present invention, the detection system described in any one of claims 1 to 3 is used, and the method includes the following steps:

[0026] Testing the acquisition success rate: Connect the test item to the digital calibration unit and the clock synchronization unit, and start the detection device; The detection result analysis unit determines whether the test item can receive and correctly display IEC 61850 signals, DL / T 698 signals, DL / T 645 signals, and synchronous clock signals, determines whether the test item can correctly transmit back the power metering data and the on-line monitoring results, and calculates the acquisition success rate of the test item for the data, so as to judge whether the device communication protocol and the acquisition success rate are normal;

[0027] Testing the metering accuracy: The digital calibration unit converts the voltage and current signals into IEC 61850 digital messages to complete the voltage and current calculations, and outputs the IEC 61850 digital messages to the test item. The test item completes the voltage and current calculations based on the IEC 61850 digital messages, and transmits the results obtained from the voltage and current calculations back to the digital calibration unit. Finally, the digital calibration unit compares the power calculation results of the two devices and outputs the accuracy calibration result;

[0028] Testing the reliability of the on-line monitoring function: The error adjustment unit outputs the angular difference and ratio difference to be adjusted, applies the angular difference and ratio difference to the phasors and phases of the voltage and current in the IEC 61850 digital message output by the digital calibration unit, repeats the steps of the metering accuracy test, and finally the detection result analysis unit determines whether the results analyzed by the on-line detection function of the test sample are consistent with the adjusted angular difference and ratio difference of the voltage and current, and outputs the on-line monitoring function monitoring result;

[0029] Generating a test report based on the results of the acquisition success rate, the accuracy calibration result, and the on-line monitoring function monitoring result.

[0030] The detection method of the multi-channel digital signal acquisition and calculation device for a substation according to an embodiment of the present invention has at least the following beneficial effects: Based on the detection of the power signal acquisition and calculation device for the substation, this method realizes the digital measurement accuracy of the calibration device, the effectiveness of the online monitoring function of the detection device, and the standardization of the data interface communication protocol of the detection device, providing a detection means for the multi-channel digital power signal acquisition and calculation device for the substation.

[0031] According to some embodiments of the present invention, in the step of testing the acquisition success rate, the calculation formula for the acquisition success rate is:

[0032]

[0033] where n sd is the total number of signals output by the digital calibration unit, and n td is the total number of signals returned by the device under test.

[0034] According to some embodiments of the present invention, in the step of testing the metering accuracy, the comparison formula for the current accuracy is:

[0035]

[0036] where is the vector value of the current output by the digital calibration unit, is the vector value of the current metered by the device under test.

[0037] According to some embodiments of the present invention, in the step of testing the metering accuracy, the comparison formula for the voltage accuracy is:

[0038]

[0039] where is the vector value of the voltage output by the digital calibration unit, is the vector value of the voltage metered by the device under test.

[0040] According to some embodiments of the present invention, in the step of testing the reliability of the online monitoring function, the judgment formula for the online monitoring function of the current accuracy:

[0041]

[0042] where i is the number of current metering points in the substation dynamic simulation test platform, is the vector value of the current output by the i-th digital calibration unit, is the vector value of the current metered by the i-th device under test.

[0043] According to some embodiments of the present invention, in the steps of the reliability test of the online monitoring function, the judgment formula for the voltage accuracy online monitoring function is as follows:

[0044]

[0045] In the formula, i is the number of voltage measurement points in the substation dynamic simulation test platform, is the vector value of the current output by the i-th digital calibration unit, is the vector value of the current measured by the i-th device under test.

[0046] According to the computer-readable storage medium of the third aspect embodiment of the present invention, the medium stores computer-executable instructions, and the computer-executable instructions are used to execute the detection method of the above-mentioned substation multi-channel digital signal acquisition and calculation device.

[0047] The additional aspects and advantages of the present invention will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0049] Figure 1 is a schematic structural diagram of a substation multi-channel digital electric energy signal acquisition and calculation device;

[0050] Figure 2 is a structural block diagram of a detection system for a substation multi-channel digital signal acquisition and calculation device provided by an embodiment of the present invention;

[0051] Figure 3 is Figure 2 a design architecture diagram of a substation dynamic simulation unit in the detection system of the substation multi-channel digital signal acquisition and calculation device shown;

[0052] Figure 4 is Figure 2 a design architecture diagram of a digital calibration unit in the detection system of the substation multi-channel digital signal acquisition and calculation device shown;

[0053] Figure 5 is a schematic diagram of the steps of a detection method for a substation electric energy signal acquisition and calculation device provided by an embodiment of the present invention;

[0054] Figure 6 is a schematic diagram of a detection device provided by an embodiment of the present invention;

[0055] Figure 7Schematic diagram of the accuracy detection results of the multi-channel digital power signal acquisition and calculation device provided by the embodiment of the present invention;

[0056] Figure 8 Schematic diagram of the online monitoring detection results of the multi-channel digital power signal acquisition and calculation device provided by the embodiment of the present invention. Detailed implementation manners

[0057] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0058] In the description of the present invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is 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 orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

[0059] In the description of the present invention, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, exceeding, etc. are understood as not including the present number, and above, below, within, etc. are understood as including the present number. If the first and second are described only for the purpose of distinguishing technical features, they should not be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or the sequence of the indicated technical features.

[0060] In the description of the present invention, unless otherwise clearly defined, words such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0061] The present invention is a detection system designed for the power signal acquisition and calculation device in a substation. In order to intuitively understand the purpose of this application, a brief description of the typical structure of the multi-channel digital power signal acquisition and calculation device in the substation is given below.

[0062] The typical design architecture of the multi-channel digital power signal acquisition and calculation device in the substation (hereinafter referred to as the "digital signal acquisition and calculation device") is as Figure 1 shown, which is composed of a digital metering board, an acquisition board, and a service board. Among them, the digital metering board and the acquisition board can be expanded according to the number of signal acquisition channels.

[0063] The acquisition board is connected to the electric energy meter through RS 485, connected to the clock through optical fiber or RS485, connected to the digital metering board through the backplane interface, connected to other service boards through the network port, and connected to the debugging device through RS 485; the digital metering board is connected to the merging unit through optical fiber; the service board is connected to the acquisition terminal through RS 485 and connected to the debugging device through the USB interface.

[0064] Embodiment 1

[0065] Based on the typical architecture of the above digital signal acquisition and calculation device, an embodiment of the present application provides a detection system for a substation multi-channel digital signal acquisition and calculation device, as Figure 2 shown, which consists of a substation dynamic simulation unit, an error adjustment unit, a digital calibration unit, a detection result analysis unit, and a clock synchronization unit.

[0066] The design architecture of the substation dynamic simulation unit is as Figure 3 shown, which consists of a three-phase programmable voltage source, a three-phase RLC load, current transformers, voltage transformers, transformers, switches, and cables. The three-phase programmable voltage source serves as the power source for the three-phase incoming line 1 and the three-phase incoming line 2, and is used to simulate the power source in the power system; the three-phase RLC load serves as the load of the II bus outgoing line and is used to simulate the load in the power system; the voltage transformer and the current transformer are used to measure the platform voltage and current, and the number of current transformers and voltage transformers can be expanded according to the metering points; the transformer is used for voltage transformation and is used to simulate the transformer in the power system; various architectures of the power system can be adjusted by adjusting the closing of the switch. The substation dynamic simulation platform can simulate various power flow conditions of the substation by adjusting the voltage source and the load.

[0067] The design architecture of the digital calibration unit is as Figure 4 shown. It consists of an AD conversion module, a signal processing module, an Ethernet output module, a signal comparison module, and a time synchronization module. Among them, the AD conversion module can be composed of devices with digital sampling functions such as digital acquisition boards, and is used to complete the conversion of voltage and current signals into digital signals; among them, the signal processing module can be composed of devices with signal processing functions such as FPGAs, and is used to complete functions such as signal filtering, voltage / current calculation, IEC 61850 signal framing, and signal synchronization; among them, the Ethernet output module can be composed of devices with signal output functions such as gigabit Ethernet interfaces, and is used to complete the forwarding of digital signals; among them, the signal comparison module can be composed of devices with voltage and current value comparison functions such as three-phase voltage / current transformer calibrators, and is used to complete the accuracy calibration of the device under test; among them, the time synchronization module can be composed of devices with clock signal reception and output functions such as synchronous clocks, and is used to receive external clock signals and perform time synchronization.

[0068] The error adjustment unit consists of a computer, and outputs a programmed control signal to adjust the ratio difference and phase difference of voltage and current in IEC 61850 in the digital calibration unit.

[0069] The detection result analysis unit consists of a computer, a printer, and a display. The computer is used for the programmed control system, the display is used to display the detection results, and the printer is used to print reports.

[0070] The clock synchronization unit consists of a power system clock synchronization device, and outputs a B-IRIG time synchronization signal for clock synchronization of the measured sample and the digital calibration unit to ensure the accuracy of the signal.

[0071] Embodiment 2

[0072] Based on the detection system of the substation multi-channel digital signal acquisition and calculation device provided in Embodiment 1, another embodiment of the present application provides a corresponding detection method for the substation multi-channel digital power signal acquisition and calculation device. As shown in Figure 5, it includes the following steps:

[0073] Step S100, acquisition success rate test.

[0074] Step S200, metering accuracy test.

[0075] Step S300, reliability test of the online monitoring function.

[0076] Step S400, generate a test report.

[0077] Among them, step S100 includes:

[0078] Step S101, connect the test sample to the monitoring device and start the device.

[0079] Connect the test sample to the digital calibration unit and the clock synchronization unit, and start the detection device.

[0080] Step S102, judge the acquisition success rate through the detection result analysis unit and output the result of the acquisition success rate.

[0081] It is judged by the detection result analysis unit whether the test sample can receive and correctly display IEC 61850 signals, DL / T 698 signals, DL / T 645 signals, and synchronous clock signals, whether the test sample can correctly transmit back the power metering data and the online monitoring results, and calculate the acquisition success rate of the test sample for the data, so as to judge whether the communication protocol and the acquisition success rate of the device are normal, and output the obtained acquisition success rate result. The acquisition success rate calculation method is shown in Formula 1.

[0082]

[0083] Where n in the formulasd is the total number of signals output by the digital calibration unit, n td is the total number of signals returned by the device under test.

[0084] Step S200 includes:

[0085] In step S201, the substation dynamic simulation test platform outputs the voltage and current signals of the substation to the digital calibration unit.

[0086] In step S202, the digital calibration unit converts the voltage and current signals into a section of IEC 61850 digital message to complete the power calculation, and outputs the message to the device under test.

[0087] The digital calibration unit converts the voltage and current signals into a section of IEC 61850 digital message to complete the voltage and current calculation, outputs this section of IEC 61850 digital message to the device under test. The device under test completes the voltage and current calculation based on this section of IEC 61850 digital message, and returns the voltage and current calculation results to the digital calibration unit. Finally, the digital calibration unit compares the power calculation results of the two devices.

[0088] Among them, the comparison formula for current accuracy is shown in Formula 2:

[0089]

[0090] In the formula is the vector value of the current output by the digital calibration unit, is the vector value of the current measured by the device under test.

[0091] The comparison formula for voltage accuracy is shown in Formula 3:

[0092]

[0093] In the formula is the vector value of the voltage output by the digital calibration unit, is the vector value of the voltage measured by the device under test.

[0094] In step S203, the digital calibration unit compares the power calculation results of the two devices and outputs the accuracy calibration result.

[0095] Step S300 includes:

[0096] In step S301, the error adjustment unit outputs the angular difference and ratio difference to be adjusted, and applies the angular difference and ratio difference to the digital calibration unit.

[0097] The error adjustment unit outputs the angular difference and ratio difference to be adjusted, and applies the angular difference and ratio difference to the phasor and phase of voltage and current in the IEC 61850 digital message output by the digital calibration unit.

[0098] Step S302: Repeat the above Step S200.

[0099] Step S303: The detection result analysis unit determines whether the result analyzed by the on-line detection function of the sample under test is consistent with the angular difference ratio of the adjusted voltage and current.

[0100] Among them, the judgment formula for the on-line monitoring function of current accuracy is shown in Equation 4:

[0101]

[0102] In the formula, i is the number of current measurement points in the substation dynamic simulation test platform, is the vector value of the current output by the i-th digital calibration unit, is the vector value of the current measured by the i-th device under test.

[0103] The judgment formula for the on-line monitoring function of voltage accuracy is shown in Equation 5:

[0104]

[0105] In the formula, i is the number of voltage measurement points in the substation dynamic simulation test platform, is the vector value of the current output by the i-th digital calibration unit, is the vector value of the current measured by the i-th device under test.

[0106] Step S400: Output all data to the detection result analysis unit to generate a detection report.

[0107] Embodiment 3:

[0108] To verify the effectiveness of the invention, a test platform was built in China Electric Power Research Institute Co., Ltd. for test verification. This test platform detects the "centralized metering device" described above, and the cabinet style is as Figure 6 shown. It is proved that this technology can effectively detect the substation multi-channel digital power signal acquisition and calculation device.

[0109] The accuracy of the formed substation multi-channel digital power signal acquisition and calculation device and the detection results of the on-line monitoring function are as Figure 7 and Figure 8 shown.

[0110] Embodiment 5:

[0111] Another embodiment of the present invention provides a computer-readable storage medium storing computer-executable instructions for executing the detection method of the substation power signal acquisition and calculation device as described above Figure 5 shown.

[0112] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0113] Those of ordinary skill in the art can understand that all or some of the steps and systems disclosed in the above methods can be implemented as software, firmware, hardware, and their appropriate combinations. Some physical components or all physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include a computer storage medium (or non-transitory medium) and a communication medium (or transitory medium). As is well known to those of ordinary skill in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information, such as computer-readable instructions, data structures, program modules, or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory, or other memory technologies, CD-ROM, digital versatile disk (DVD), or other optical disk storage, magnetic cassette, tape, magnetic disk storage, or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, as is well known to those of ordinary skill in the art, communication media typically includes computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transmission mechanism, and can include any information delivery medium.

[0114] The above is a specific description of the preferred embodiments of this application, but this application is not limited to the above embodiments. Those skilled in the art can also make various equivalent deformations or substitutions without departing from the spirit of this application, and these equivalent deformations or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A detection system for a multi-channel digital signal acquisition and calculation device of a substation, characterized in that: include: Substation dynamic simulation unit, error adjustment unit, digital calibration unit, detection result analysis unit, and clock synchronization unit, wherein: The substation dynamic simulation unit is connected to the digital calibration unit and is used to simulate various power flow conditions of the substation; The error adjustment unit is connected to the digital calibration unit, and the error adjustment unit is used to output a program-controlled signal to adjust the voltage and current ratio difference and the angle difference in the digital calibration unit; The detection result analysis unit is connected to the digital calibration unit, and the detection result analysis unit can obtain the detection result transmitted by the digital calibration unit and generate a report; The clock synchronization unit is connected to the digital calibration unit and the sample under test respectively, and the clock synchronization unit outputs a B-IRIG timing signal for performing clock synchronization between the sample under test and the digital calibration unit to ensure the accuracy of the signal; The digital calibration unit is used to obtain voltage and current signals and convert them into digital signals, and based on the clock signal and / or the program control signal, implement at least one of filtering, voltage or current calculation, signal framing, and signal synchronization of the digital signal, and finally output the processed digital signal.

2. The system according to claim 1, characterized in that The substation dynamic simulation unit includes a three-phase programmable voltage source, a three-phase RLC load, a current transformer, a voltage transformer, a transformer, a switch and a cable, wherein: The three-phase programmable voltage source is used as the power source of the three-phase incoming line 1 and the three-phase incoming line 2 to simulate the power supply in the power system; The three-phase RLC load is used as the load of the II bus outlet to simulate the load in the power system; The voltage transformer and current transformer are used to measure the platform voltage and current; The transformer is used to transform voltage and simulate the transformer in the power system; the adjustment of various architectures of the power system is completed by adjusting the switch closure.

3. The system according to claim 1, characterized in that The digital calibration unit includes an AD conversion module, a signal processing module, an Ethernet output module, a signal comparison module, and a timing module, wherein: The AD conversion module is composed of a digital acquisition board and is used to complete the conversion of voltage and current signals into digital signals; The signal processing module is composed of FPGA and is used to complete functions such as signal filtering, voltage or current calculation, signal framing, and signal synchronization; The Ethernet output module has a Gigabit Ethernet interface for forwarding digital signals; The signal comparison module includes a three-phase voltage / current transformer calibrator for completing the accuracy calibration of the device under test; The timing module includes a synchronous clock, which is used to receive an external clock signal and perform timing.

4. A detection method for a multi-channel digital signal acquisition and calculation device of a substation, using the detection system described in any one of claims 1 to 3, comprising the following steps: To collect the success rate test, connect the tested product with the digital calibration unit and the clock synchronization unit, and start the detection device; The test result analysis unit determines whether the tested product can receive and correctly display IEC 61850 signals, DL / T 698 signals, DL / T 645 signals, and synchronous clock signals, determines whether the tested product can correctly transmit back electric energy metering data and online monitoring results, and calculates the data collection success rate of the tested product, so as to determine whether the device communication protocol and collection success rate are normal; Measurement accuracy test: the digital calibration unit converts the voltage and current signals into IEC 61850 digital messages to complete voltage and current calculations, and outputs the IEC 61850 digital messages to the DUT. The DUT completes voltage and current calculations based on the IEC 61850 digital messages, and transmits the voltage and current calculation results back to the digital calibration unit. Finally, the digital calibration unit compares the electric energy calculation results of the two devices and outputs the accuracy calibration results. Online monitoring function reliability test: the error adjustment unit outputs the angle difference and ratio difference that need to be adjusted, applies the angle difference and ratio difference to the phasor and phase of the voltage and current in the IEC 61850 digital message output by the digital calibration unit, repeats the measurement accuracy test steps, and finally the test result analysis unit determines whether the result analyzed by the online detection function of the tested sample is consistent with the adjusted angle difference and ratio difference of the voltage and current, and outputs the monitoring result of the online monitoring function; A test report is generated based on the acquisition success rate result, the accuracy calibration result and the online monitoring function monitoring result.

5. The method according to claim 4, characterized in that In the step of the acquisition success rate test, the calculation formula of the acquisition success rate is: Where n sd is the total number of signals output by the digital calibration unit, n td is the total number of signals sent back by the device under test.

6. The method according to claim 4, characterized in that In the measurement accuracy test step, the current accuracy comparison formula is: In the formula is the vector value of the current output by the digital calibration unit, The vector value of the current measured by the device under test.

7. The method according to claim 4, characterized in that In the measurement accuracy test step, the voltage accuracy comparison formula is: In the formula is the vector value of the voltage output by the digital calibration unit, The vector value of the voltage measured by the device under test.

8. The method according to claim 4, characterized in that In the step of the online monitoring function reliability test, the judgment formula of the current accuracy online monitoring function is: Where i is the number of current metering points in the substation dynamic model test platform, is the vector value of the current output by the i-th digital calibration unit, is the vector value of the current measured by the i-th device under test.

9. The method according to claim 4, characterized in that In the step of online monitoring function reliability test, the judgment formula of voltage accuracy online monitoring function is: Where i is the number of voltage metering points in the dynamic model test platform of the substation, is the vector value of the current output by the i-th digital calibration unit, is the vector value of the current measured by the i-th device under test.

10. A computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are used to execute the method according to any one of claims 4 to 9.

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