A high-voltage electric energy metering system, error analysis method, medium and terminal

Abstract

A kind of high-voltage electric energy metering system and error analysis method, indirectly read the current and voltage information of high-voltage power grid by using current transformer and voltage transformer, and the measured power grid information is transmitted to signal merging unit through differential amplification circuit, the signal merging unit based on synchronous clock signal synchronously merges voltage and current signals, and then transmits the signals to electric energy meter, which is recorded and then transmitted to electric energy metering device.By analyzing the working environment information of transformer and the measured current and voltage information, it is determined whether the power grid information sent to the electric energy metering device is within the error allowable range, so that the control center can make timely prediction and response to possible dangers.The high-voltage electric energy metering system of the present application can realize indirect metering of the electric energy of high-voltage power grid, and at the same time, the measurement error of transformer is analyzed and predicted through the error analysis circuit, improving the operation stability and safety of the system.

Description

Technical Field

[0001] This invention belongs to the field of integrated energy management technology, and mainly relates to a high-voltage power metering system and error analysis method. Background Technology

[0002] With the continuous emergence of new power grid technologies, the demand for power system reform is also increasing. Especially with the recent introduction of the "smart grid" concept, the importance of electricity metering technology is unprecedented. Electricity metering is used to calculate various technical and economic indicators of the power system, such as power generation, plant power consumption, power supply, electricity consumption, line losses, and coal consumption. However, currently, many substations in my country use electricity metering systems with various defects, resulting in inaccurate metering results and becoming a bottleneck in the comprehensive realization of a smart grid in my country.

[0003] Therefore, improving the accuracy of electricity metering is of great significance. A crucial issue that arises is how to reduce the errors of electricity metering devices while meeting the requirements of smart grids. The overall error in electricity metering comprises four parts: meter error, voltage transformer (VT) error, current transformer (CT) error, and voltage drop error in the secondary circuit of the voltage transformer. Among these, the errors caused by voltage and current transformers are often difficult to estimate. Therefore, it is essential to monitor the operating status of the transformers and reduce the transmission of erroneous metering information. Summary of the Invention

[0004] The purpose of this invention is to provide a high-voltage power metering system and error analysis method to achieve power metering of high-voltage power grids, while also detecting abnormal operating states of the measurement system, improving the measurement accuracy of the system, and providing a more accurate judgment of the operating state of the high-voltage power grid to ensure the safety of the power grid during operation.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A high-voltage power metering system includes: a current transformer, a voltage transformer, a differential amplifier circuit, a signal merging unit, a power meter, a signal splitting circuit, an error monitoring center, and a power metering device; the inputs of the current transformer and the voltage transformer are connected to the high-voltage power grid, the outputs of the current transformer and the voltage transformer are respectively connected to the differential amplifier circuit, the differential amplifier circuit is connected to the signal merging unit, the output of the signal merging unit is connected to the signal splitting circuit and the power meter, the output of the power meter is connected to the power metering device, and the output of the signal splitting circuit is connected to the error monitoring center; Current transformers and voltage transformers are used to measure voltage and current signals in high-voltage power grids, respectively. The differential amplifier circuit is used to process the voltage signal and the current signal separately. The signal combining unit is used to combine the voltage signal and the current signal after processing by the differential amplifier circuit to obtain the measurement signal, and input the measurement signal to the energy meter and the signal splitting circuit respectively. The signal splitting circuit is used to decompose the merged measurement signal into voltage and current values, and then transmit the voltage and current values ​​to the error detection center. The error monitoring center is used to determine whether the measured voltage and current values ​​are within the allowable error range based on the operating environment of the current transformer and voltage transformer, the measurement error of the voltage transformer, and the measurement error of the current transformer, and to obtain the judgment results of the voltage and current values; and based on the judgment results, to determine whether the voltage signal and current signal are within the allowable error range; and based on whether the voltage signal and current signal are within the allowable error range, to issue control signals to allow or block the energy meter from transmitting high-voltage grid information to the energy metering device according to the measurement signal.

[0006] Furthermore, the high-voltage power metering system also includes a control center, which is connected to the error monitoring center; The control center is used to send a first control signal to the energy meter when the measured voltage and current values ​​are within the allowable error range, so that the energy meter can transmit high-voltage grid information to the energy metering device according to the measurement signal, and the energy metering device integrates the high-voltage grid information. The control center is also used to send a second control signal to the electricity meter when the measured voltage and current values ​​are not within the allowable error range, so as to block the electricity meter from transmitting high-voltage grid information to the electricity metering device according to the measurement signal, and to notify relevant personnel to check the working health of the current transformer and voltage transformer.

[0007] Furthermore, The high-voltage power metering system also includes a transformer operating environment information input module, which is used to monitor the operating environment information of current transformers and voltage transformers, and input the operating environment information of current transformers and voltage transformers to the error monitoring center.

[0008] Furthermore, the error monitoring center is used to determine whether the measured voltage and current signals are within the allowable error range based on the operating environment of the current transformer and voltage transformer, the measurement error of the voltage transformer, and the measurement error of the current transformer, including: The measurement error of the voltage transformer is used to judge the working environment information of the voltage transformer. Based on the judgment result, it is determined whether the measured voltage signal is within the allowable error range. The measurement error of the current transformer is used to judge the working environment information of the current transformer. Based on the judgment result, it is determined whether the measured current signal is within the allowable error range.

[0009] Furthermore, the operating environment information of the voltage transformer includes ambient temperature, ambient magnetic field strength, input signal frequency, and external electric field strength; the measurement error of the voltage transformer includes the degree of influence of ambient temperature error, ambient magnetic field error, signal frequency error, and external electric field error; the measurement error of the voltage transformer is used to judge the operating environment information of the voltage transformer, and based on the judgment result, it is determined whether the measured voltage signal is within the allowable error range, including: The ambient temperature of the voltage transformer is compared with the degree of influence of ambient temperature error to determine the first error parameter of the voltage transformer. The magnitude of the ambient magnetic field of the voltage transformer is compared with the degree of influence of the ambient magnetic field error to determine the second error parameter of the voltage transformer. The third error parameter of the voltage transformer is determined by comparing the frequency of the input signal of the voltage transformer based on the degree of influence of the signal frequency error. The magnitude of the external electric field of the voltage transformer is compared with the degree of influence of the external electric field error to determine the fourth error parameter of the voltage transformer. The sum of the first, second, third, and fourth error parameters of the voltage transformer is compared with the first threshold, and the result of the comparison determines whether the measured voltage signal is within the allowable error range.

[0010] Furthermore, the operating environment information of the current transformer includes ambient temperature, ambient magnetic field strength, residual magnetism, and high-voltage leakage current. The metering error of the current transformer includes the degree of influence from ambient temperature error, ambient magnetic field error, residual magnetism error, and high-voltage leakage current error. The metering error of the current transformer is used to judge the operating environment information of the current transformer. Based on the judgment result, it is determined whether the measured current signal is within the allowable error range, including: The ambient temperature of the current transformer is compared with the degree of influence of ambient temperature error to determine the first error parameter of the current transformer. The magnitude of the ambient magnetic field of the current transformer is compared with the degree of influence of the ambient magnetic field error to determine the second error parameter of the current transformer. The magnitude of the residual magnetism of the current transformer is compared based on the degree of influence of the residual magnetism error, and the third error parameter of the current transformer is determined. The magnitude of the high-voltage leakage current of the current transformer is compared based on the degree of influence of the high-voltage leakage current error, and the fourth error parameter of the current transformer is determined. The sum of the first, second, third, and fourth error parameters of the current transformer is compared with the first threshold, and the result of the comparison is used to determine whether the measured voltage signal is within the allowable error range.

[0011] Furthermore, the error monitoring results, based on the judgment of the error monitoring center regarding whether the high-voltage power grid metering information is within the allowable error range, include: When the measured voltage and current values ​​are both within the allowable error range, it indicates whether the metering information of the high-voltage power grid is within the allowable error range; otherwise, it indicates that the metering information of the high-voltage power grid is not within the allowable error range.

[0012] Specifically, the voltage transformer metering error E V =E T +E H +E f +E E , when E V <E +V When the voltage transformer's metering error is within the allowable range, E in the above formula is used to determine that the error is within the allowable range. +V The allowable range of VT measurement error; Current transformer metering error E C =E T +E H +E I+ E R , when E C <E +C When the current transformer's metering error is within the allowable range, E in the above formula is considered to be within the allowable range. +C The allowable range of VT measurement error; Among them, E T E represents the degree of influence of ambient temperature error. H E represents the degree of influence of environmental magnetic field errors. f E represents the degree of influence of signal frequency error. E E represents the degree of influence of external electric field error. I The degree of influence of high voltage leakage current error, E R This represents the degree of influence of residual magnetism error.

[0013] This invention also proposes an error analysis method for a high-voltage power metering system, the method comprising the following steps: Step 1: Indirectly measure the voltage and current signals of the high-voltage power grid using current transformers and voltage transformers; Step 2: The voltage and current signals are processed separately using a differential amplifier circuit, and the voltage and current signals processed by the differential amplifier circuit are combined using a signal combining unit to obtain the measurement signal; Step 3: The measurement signal is transmitted to the signal splitting circuit and the energy meter respectively, so that the signal splitting circuit decomposes the measurement signal into voltage and current values ​​and then transmits them to the error detection center. The error monitoring center determines whether the measured voltage and current values ​​are within the allowable error range based on the working environment of the current transformer and voltage transformer, the measurement error of the voltage transformer, and the measurement error of the current transformer. Based on the judgment result, the center determines whether the voltage signal and current signal are within the allowable error range. Step 5: Based on whether the voltage and current signals are within the allowable error range, issue a control signal to allow or block the energy meter from transmitting high-voltage grid information to the energy metering device according to the measurement signal.

[0014] This application also discloses a terminal, including a processor and a storage medium; The storage medium is used to store instructions; The processor is configured to operate according to the instructions to perform the steps according to the aforementioned error analysis method.

[0015] A computer-readable medium having a computer program stored thereon, characterized in that the program, when executed by a processor, implements the steps of the aforementioned error analysis method.

[0016] According to the high-voltage power metering system and error analysis method of the present invention, indirect metering of power in high-voltage power grids can be realized. At the same time, the error analysis circuit realizes the analysis and prediction of the measurement error of the instrument transformer, thereby improving the operational stability and safety of the system. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the high-voltage power metering system of the present invention. Detailed Implementation

[0018] The present application will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention, and should not be construed as limiting the scope of protection of the present application.

[0019] like Figure 1 As shown, the present invention proposes a high-voltage power metering system, including a current transformer, a voltage transformer, a differential amplifier circuit, a signal merging unit, a signal splitting circuit, an error detection center, a power meter, a control center, and a power metering device.

[0020] The current and voltage of high-voltage power grids cannot be measured directly. It is necessary to use current transformers to convert large voltage and current signals into proportionally reduced voltage signals.

[0021] In this embodiment, during the indirect measurement process, the grid voltage signal and current signal are transformed into proportional small-data AC voltage signals through the action of voltage transformers and current transformers.

[0022] The generated voltage signal is amplified by a differential amplifier circuit and then combined in a signal combining unit. The combined information is then transmitted to the energy meter, which records the relevant information.

[0023] During signal transmission, before the information reaches the energy meter, a differential amplifier circuit amplifies the voltage and current signals. Differential amplifier circuits have good common-mode signal suppression capabilities, effectively suppressing zero-point drift. The voltage U0 of the voltage signal after amplification by the differential amplifier is: U0 = A d U i (1) In the formula, A d U is the differential-mode gain of the differential amplifier circuit. i The voltage of the voltage signal input to the differential amplifier circuit.

[0024] This embodiment employs a time synchronization unit, which is a synchronous PMU device based on synchronous satellite signals. Its main function is to synchronize the amplified voltage and current measurement results to the same time coordinate. By synchronizing the combined current and voltage measurement signals before transmitting them to the energy meter, the accuracy of the measurement results can be improved to a certain extent. Furthermore, since the voltage and current conditions of the high-voltage power grid at a specific moment can be accurately obtained, a rapid response can be made to potential power grid faults, reducing errors generated during operation.

[0025] The signal splitting circuit is used to decompose the merged measurement signal into voltage and current values, and then transmit the voltage and current values ​​to the error detection center. The error monitoring center is used to determine whether the measured voltage and current values ​​are within the allowable error range based on the operating environment of the current transformer and voltage transformer, the measurement error of the voltage transformer, and the measurement error of the current transformer, and to obtain the judgment results of the voltage and current values; and based on the judgment results, to determine whether the voltage signal and current signal are within the allowable error range; and based on whether the voltage signal and current signal are within the allowable error range, to issue control signals to allow or block the energy meter from transmitting high-voltage grid information to the energy metering device according to the measurement signal.

[0026] The working principle of the signal splitting circuit is as follows: U C =A d (U1+U2)(2) U1 = 1.5U2e jβ (3) In the formula, U C The measurement signals input to the signal splitting circuit are U1 and U2, which are the voltage and current signals in the high-voltage power grid after being transformed by voltage transformers and current transformers, respectively.

[0027] β is the phase difference between the voltage and current signals, j is the complex domain, and U2e jβ This refers to the phase of U2 shifting by an angle β, making U1 and U2 in phase.

[0028] The voltage and current signals in the high-voltage power grid are transformed by voltage transformers and current transformers into signals U1 and U2, which are scaled down from the signals in the high-voltage power grid in step two. The magnitude difference is 1.5 times, and the phase angle difference is β.

[0029] The electricity meter receives the voltage and current measurement signals after time synchronization, amplifies the values ​​to display the voltage and current of the high-voltage power grid at this time. When the error monitoring center confirms that the voltage and current signals are within the allowable error range, it transmits the voltage and current of the high-voltage power grid at this time to the electricity metering device so that the electricity metering device records the power grid operation status at this moment.

[0030] The metering system includes a control center connected to an error monitoring center. The error monitoring center determines whether the measured voltage and current signals are within the allowable error range based on the operating environment of the current transformer and voltage transformer, the metering error of the voltage transformer, and the metering error of the current transformer. It then issues control signals to allow or block the transmission of high-voltage grid information from the energy meter to the energy metering device. The high-voltage grid information includes the voltage and current of the high-voltage grid.

[0031] The metering system also includes a current transformer operating environment information input module, which inputs the monitored current transformer operating environment information to the error monitoring center.

[0032] The overall error in electricity metering includes the error of the electricity meter, the error of the voltage transformer (VT), the error of the current transformer (CT), and the voltage drop error in the secondary circuit of the voltage transformer. Among these, the error of the electricity meter and the voltage drop error in the secondary circuit of the voltage transformer are almost negligible in today's high-precision measurement environment. However, the voltage transformer and current transformer are the first link in the entire measurement process, and their operating environment has a significant impact on the measurement accuracy of the transformers. The following factors mainly affect the measurement results of the transformers: Factors affecting the accuracy of VT measurement include: ambient temperature, ambient magnetic field strength, input signal frequency, and external electric field strength. Factors affecting the accuracy of CT measurement include: ambient temperature, ambient magnetic field strength, residual magnetism, and high-voltage leakage current. (1) Quantification of influencing factors To facilitate the measurement of the magnitude of the influence of the above-mentioned influencing factors on the measurement results, the above-mentioned error influencing factors are quantified: Generally, VT / CTs can operate normally in ambient temperatures ranging from -25°C to 55°C. However, the degree of temperature impact is related to the length of time the transformer has been in use; excessively high or low temperatures will affect the transformer's performance. When the VT / CT operates at temperature T, the degree of error impact E... T for:

[0033] In the formula, T0 is the lower limit of the temperature of the VT / CT under normal operating conditions, and T1 is the upper limit of the temperature of the VT / CT under normal operating conditions.

[0034] The effect of frequency on VT measurement error is similar to that of temperature. The effect of frequency is minimal when the operating frequency is between 49.5Hz and 50.5Hz. When the VT operates at frequency f, the degree of error influence E is significant. f for:

[0035] In the formula, f0 is the minimum normal operating frequency of VT, and f1 is the maximum normal operating frequency of VT.

[0036] The trends of measurement errors in current transformers caused by external electric and magnetic fields and high-voltage leakage current are basically the same. The measurement errors of current transformers and voltage transformers tend to increase with the increase of external electric / magnetic fields / high-voltage leakage current.

[0037] When the VT / CT operates under a magnetic field of strength H, the degree of error influence E H for:

[0038] In the formula, E xH This represents the maximum magnetic field strength at which VT can operate.

[0039] When VT operates under an electric field of intensity E, the degree of error influence E E for:

[0040] In the formula, E xE This represents the maximum electric field strength at which VT can operate.

[0041] When a high-voltage leakage current of magnitude I flows during CT measurement, the resulting error is affected by E. Ifor:

[0042] In the formula, I xE This is the maximum leakage current that the CT can withstand.

[0043] Current losses and the secondary windings of the transformer can generate residual magnetism in the core of the current transformer (CT), reducing the core's permeability and consequently affecting the measurement accuracy of the current transformer. Over time, the DC component of the residual magnetism gradually decays to zero, and its impact on CT error decreases. Therefore, the residual magnetism effect can be represented by the time it takes for the residual magnetizing current to be generated.

[0044] When residual magnetism is generated in CT scans R After time, the degree of error influence E R for:

[0045] In the formula, E xR This is a reference time obtained during the measurement process, which is an intermediate variable and will not be elaborated upon in this patent.

[0046] (2) Determining the operating status of the current transformer The method for determining the accuracy of the operating status of voltage transformers and current transformers is as follows: For VT, the total error E = E T +E H +E f +E E , when E <E +V If the VT error is within the allowable range, the control center will issue an organization signal, and the electricity meter will stop transmitting high-voltage grid information to the electricity metering device. The center will also notify the relevant equipment in the circuit to check the working status of the VT and carry out timely maintenance.

[0047] In the above formula, E +V The allowable range for VT measurement error is generally set to [0.1, 0.2]. For CT scans, the total error E = E T +E H +E I+ E R , when E <E +C If the CT error is within the allowable range, the control center will issue a blocking signal, and the electricity meter will stop transmitting high-voltage grid information to the electricity metering device. The center will also notify the relevant equipment in the inspection circuit and the working status of the CT for timely repair.

[0048] In the above formula, E +C The allowable range for VT measurement error is generally set to [0.15, 0.25].

[0049] At the same time, we can make a brief judgment on the circuit's operating state based on the above error diagnosis results. If E f If E is too high, it indicates a problem with the power quality in the high-voltage power grid; if E I If the value is too high, it indicates that the current loss in the circuit and the secondary winding of the transformer have too much influence on the current transformer. The working status of the relevant components should be checked.

[0050] If neither the current transformer nor the voltage transformer has an error diagnosis that exceeds the limit, the error monitoring center will not respond, and the high-voltage power metering system will operate normally.

[0051] Furthermore, this invention proposes an error analysis method based on the aforementioned high-voltage power metering system, comprising the following steps: Step 1: Indirectly measure the voltage and current signals of the high-voltage power grid through current transformers and voltage transformers, and convert them into small-data AC voltage signals; Step 2: The generated voltage signals are passed through a differential amplifier circuit and then combined in the signal combining unit; Step 3: The merged information is transmitted to the electricity meter, and the electricity meter records the relevant information; Step 4: The signal splitting circuit decomposes the merged signal and transmits it to the error detection center. The error monitoring center determines whether the measured high-voltage power grid metering information is within the allowable error range based on the transformer's working environment and the measurement information of current and voltage. If it is within the allowable range, it jumps to step 6; if the error is too large, it jumps to step 5. Step 5: Block the information transmission from the electricity meter to the electricity metering system, and notify relevant personnel to check the working condition of the current transformer and voltage transformer; Step Six: The electricity meter transmits high-voltage grid information to the electricity metering device, which then integrates the information.

[0052] This disclosure can be a system, method, and / or computer program product. A computer program product may include a computer-readable storage medium having computer-readable program instructions loaded thereon for causing a processor to implement various aspects of this disclosure.

[0053] Computer-readable storage media can be tangible devices capable of holding and storing instructions for use by an instruction execution device. Computer-readable storage media can be, for example—but not limited to—electrical storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of computer-readable storage media include: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital multifunction disc (DVD), memory sticks, floppy disks, mechanical encoding devices, such as punch cards or recessed protrusions storing instructions thereon, and any suitable combination of the foregoing. The computer-readable storage media used herein are not to be construed as transient signals themselves, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., light pulses through fiber optic cables), or electrical signals transmitted through wires.

[0054] The computer-readable program instructions described herein can be downloaded from computer-readable storage media to various computing / processing devices, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external storage device. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to the computer-readable storage media in the respective computing / processing device.

[0055] Computer program instructions used to perform the operations of this disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, status setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The computer-readable program instructions may execute entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or may be connected to an external computer (e.g., via the Internet using an Internet service provider). In some embodiments, electronic circuitry, such as programmable logic circuitry, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), is personalized by utilizing the status information of the computer-readable program instructions to implement various aspects of this disclosure.

[0056] The applicant of this invention has provided a detailed description of the embodiments of the invention in conjunction with the accompanying drawings. However, those skilled in the art should understand that the above embodiments are merely preferred embodiments of the invention. The detailed description is only intended to help readers better understand the spirit of the invention and is not intended to limit the scope of protection of the invention. On the contrary, any improvements or modifications made based on the inventive spirit of the invention should fall within the scope of protection of the invention.

Claims

1. A high-voltage power metering system, characterized in that, include: The system includes a current transformer, a voltage transformer, a differential amplifier circuit, a signal merging unit, an energy meter, a signal splitting circuit, an error monitoring center, and an energy metering device. The inputs of the current transformer and the voltage transformer are connected to the high-voltage power grid. The outputs of the current transformer and the voltage transformer are respectively connected to the differential amplifier circuit. The differential amplifier circuit is connected to the signal merging unit. The output of the signal merging unit is connected to the signal splitting circuit and the energy meter. The output of the energy meter is connected to the energy metering device. The output of the signal splitting circuit is connected to the error monitoring center. Current transformers and voltage transformers are used to measure voltage and current signals in high-voltage power grids, respectively. The differential amplifier circuit is used to process the voltage signal and the current signal separately. The signal combining unit is used to combine the voltage signal and the current signal after processing by the differential amplifier circuit to obtain the measurement signal, and input the measurement signal to the energy meter and the signal splitting circuit respectively. The signal splitting circuit is used to decompose the merged measurement signal into voltage and current values, and then transmit the voltage and current values ​​to the error detection center. The error monitoring center is used to determine whether the measured voltage and current values ​​are within the allowable error range based on the working environment of the current transformer and voltage transformer, the measurement error of the voltage transformer, and the measurement error of the current transformer, and to obtain the judgment results of the voltage and current values. Based on the judgment result, determine whether the voltage signal and current signal are within the allowable error range; based on whether the voltage signal and current signal are within the allowable error range, issue a control signal to allow or block the energy meter from transmitting high-voltage grid information to the energy metering device according to the measurement signal; This includes: using the measurement error of the voltage transformer to judge the working environment information of the voltage transformer, and determining whether the measured voltage signal is within the allowable error range based on the judgment result; The measurement error of the current transformer is used to judge the working environment information of the current transformer. Based on the judgment result, it is determined whether the measured current signal is within the allowable error range.

2. The high-voltage power metering system according to claim 1, characterized in that: The high-voltage power metering system also includes a control center, which is connected to the error monitoring center; The control center is used to send a first control signal to the energy meter when the measured voltage and current values ​​are within the allowable error range, so that the energy meter can transmit high-voltage grid information to the energy metering device according to the measurement signal, and the energy metering device integrates the high-voltage grid information. The control center is also used to send a second control signal to the electricity meter when the measured voltage and current values ​​are not within the allowable error range, so as to block the electricity meter from transmitting high-voltage grid information to the electricity metering device according to the measurement signal, and to notify relevant personnel to check the working health of the current transformer and voltage transformer.

3. The high-voltage power metering system according to claim 2, characterized in that: The high-voltage power metering system also includes a transformer operating environment information input module, which is used to monitor the operating environment information of current transformers and voltage transformers, and input the operating environment information of current transformers and voltage transformers to the error monitoring center.

4. The high-voltage power metering system according to claim 3, characterized in that: The operating environment information of a voltage transformer includes ambient temperature, ambient magnetic field strength, input signal frequency, and external electric field strength. The measurement error of the voltage transformer includes the degree of influence from ambient temperature, ambient magnetic field, signal frequency, and external electric field. The measurement error of the voltage transformer is used to assess its operating environment information. Based on the assessment result, it is determined whether the measured voltage signal is within the allowable error range, including: The ambient temperature of the voltage transformer is compared with the degree of influence of ambient temperature error to determine the first error parameter of the voltage transformer. The magnitude of the ambient magnetic field of the voltage transformer is compared with the degree of influence of the ambient magnetic field error to determine the second error parameter of the voltage transformer. The third error parameter of the voltage transformer is determined by comparing the frequency of the input signal of the voltage transformer based on the degree of influence of the signal frequency error. The magnitude of the external electric field of the voltage transformer is compared with the degree of influence of the external electric field error to determine the fourth error parameter of the voltage transformer. The sum of the first, second, third, and fourth error parameters of the voltage transformer is compared with the first threshold, and the measured voltage signal is determined to be within the allowable error range based on the comparison result.

5. The high-voltage power metering system according to claim 4, characterized in that: The operating environment information of a current transformer includes ambient temperature, ambient magnetic field strength, residual magnetism, and high-voltage leakage current. The metering error of the current transformer includes the degree of influence from ambient temperature, ambient magnetic field, residual magnetism, and high-voltage leakage current. The metering error of the current transformer is used to assess its operating environment information. Based on the assessment results, it is determined whether the measured current signal is within the allowable error range, including: The ambient temperature of the current transformer is compared with the degree of influence of ambient temperature error to determine the first error parameter of the current transformer. The magnitude of the ambient magnetic field of the current transformer is compared with the degree of influence of the ambient magnetic field error to determine the second error parameter of the current transformer. The magnitude of the residual magnetism of the current transformer is compared based on the degree of influence of the residual magnetism error, and the third error parameter of the current transformer is determined. The magnitude of the high-voltage leakage current of the current transformer is compared based on the degree of influence of the high-voltage leakage current error, and the fourth error parameter of the current transformer is determined. The sum of the first, second, third, and fourth error parameters of the current transformer is compared with the first threshold, and the result of the comparison determines whether the measured current signal is within the allowable error range.

6. The high-voltage power metering system according to claim 5, characterized in that: Error monitoring results, based on whether the high-voltage power grid metering information is within the allowable error range as determined by the error monitoring center, include: When the measured voltage and current values ​​are both within the allowable error range, it indicates that the metering information of the high-voltage power grid is within the allowable error range; otherwise, it indicates that the metering information of the high-voltage power grid is not within the allowable error range.

7. The high-voltage power metering system according to claim 6, characterized in that, The metering error of voltage transformer EV=ET+EH+Ef+EE, when EV<E+V, it is determined that the metering error of the voltage transformer is within the allowable range, in the above formula, E+V is the allowable range of VT measurement error; The metering error of current transformer EC=ET+EH+EI+ER, when EC<E+C, it is determined that the metering error of the current transformer is within the allowable range, in the above formula, E+C is the allowable range of CT measurement error; Wherein, ET is the influence degree of ambient temperature error, EH is the influence degree of ambient magnetic field error, Ef is the influence degree of signal frequency error, EE is the influence degree of external electric field error; EI is the influence degree of high-voltage leakage current error, and ER is the influence degree of residual magnetism error.

8. An error analysis method based on the high-voltage power metering system described in claims 1-7, characterized in that, The method comprises the following steps: Step 1: Indirectly measuring voltage signals and current signals of a high-voltage power grid through a current transformer and a voltage transformer; Step 2: Processing the voltage signal and the current signal respectively by using a differential amplification circuit, and merging the voltage signal and the current signal processed by the differential amplification circuit by using a signal merging unit to obtain a measurement signal; Step 3: Transmitting the measurement signal to a signal splitting circuit and an electric energy meter respectively, so that the signal splitting circuit decomposes the measurement signal into a voltage value and a current value and then transmits them to an error detection center, and the error monitoring center determines whether the measured voltage value and current value are within the allowable error range according to the working environment of the current transformer and voltage transformer, the metering error of the voltage transformer and the metering error of the current transformer, and determines whether the voltage signal and the current signal are within the allowable error range according to the judgment result; Step 5: According to whether the voltage signal and the current signal are within the allowable error range, issuing a control signal to allow or block the electric energy meter from transmitting high-voltage power grid information to the electric energy metering device based on the measurement signal.

9. A terminal, comprising a processor and a storage medium; characterized in that: the storage medium is configured to store instructions; the processor is configured to operate according to the instructions to execute the steps of the method according to claim 8.

10. A computer-readable medium having a computer program stored thereon, characterized in that, when the program is executed by a processor, the steps of the method according to claim 8 are implemented.

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