Measurement module, plant station electric energy acquisition system and method

Abstract

The invention relates to a measurement module and a plant station electric energy acquisition system and method, and the measurement module comprises a signal conditioning module which is used for carrying out the preprocessing of a secondary voltage signal and a secondary current signal entering a detected gateway electric energy meter, and obtaining a processed signal; the A / D sampling module is used for converting the processed signal into a digital signal; the electric energy metering module is used for generating standard electric energy data based on the digital signal; and the electric energy error calculation module is used for comparing and calculating the standard electric energy data and the electric energy pulse signal from the detected gateway electric energy meter so as to determine the electric energy error of the detected gateway electric energy meter. According to the scheme of the invention, the functions of synchronous electric quantity acquisition, online verification and the like of a plurality of gateway electric energy meters can be realized, and the requirements of real-time monitoring and online diagnosis of the operation states of the gateway electric energy meters are met.

Description

Technical Field

[0001] The present application relates to the technical field of electric energy meter monitoring, and in particular to a measurement module, a plant power energy collection system and a method. Background Art

[0002] In the power system, gateway electricity meters are key equipment for calculating the operating efficiency of the power grid. Their measurement accuracy and reliability are directly related to the fairness of power transactions, the efficiency of new energy consumption and the economic efficiency of power grid operation.

[0003] Currently, according to the "DL / T448-2016 Technical Management Regulations for Electricity Metering Devices," different types of electricity metering devices require different on-site inspection cycles. Specifically, Class I electricity metering devices require on-site inspection every six months, Class II devices every 12 months, and Class III devices every 24 months. However, this traditional regular inspection method has many shortcomings.

[0004] The traditional manual on-site regular inspection mode cannot monitor the operating status of gateway electricity meters in real time, and untraceable measurement deviations may occur between two inspection cycles.

[0005] However, the existing electric energy collection terminals only undertake the role of collecting, storing and uploading electric energy data of gateway electric energy meters. In terms of data collection dimensions, frequency and data real-time performance, they are mainly designed around scheduling needs. As a result, the existing electric energy metering devices are unable to meet the needs of real-time monitoring and online diagnosis of the operating status of gateway electric energy meters. Summary of the Invention

[0006] In response to the traditional electricity metering system's reliance on periodic inspections and lack of a continuous equipment status assessment mechanism, this application proposes an "online monitoring-dynamic calibration" solution. This solution uses a high-precision electrical parameter acquisition unit combined with an online calibration algorithm to achieve online closed-loop control of metering accuracy. This application also proposes a plant-station electricity energy acquisition system to achieve synchronous energy acquisition and online calibration of gateway electricity meters. The system features ultra-high-frequency sampling, high precision, high efficiency, and high reliability.

[0007] According to a first aspect of the present application, a measurement module is provided, characterized by comprising:

[0008] The signal conditioning module is used to pre-process the secondary voltage and secondary current signals of the electric energy meter entering the inspected gateway to obtain processed signals;

[0009] An A / D sampling module, configured to convert the processed signal into a digital signal;

[0010] an electric energy metering module, configured to generate standard electric energy data based on the digital signal; and

[0011] The electric energy error calculation module is used to compare and calculate the standard electric energy data and the electric energy pulse signal from the electric energy meter of the inspected gateway to determine the electric energy error of the electric energy meter of the inspected gateway.

[0012] According to a second aspect of the present application, a power plant electric energy collection system is provided, characterized by comprising:

[0013] The electric energy meter at the inspected gateway is used to collect the secondary current and secondary voltage of the secondary circuit and calculate the electric energy data according to the secondary current and the secondary voltage; and

[0014] The measurement module as described in the first aspect.

[0015] According to a third aspect of the present application, a method for collecting power energy from a power plant is provided, which is applied to a measurement module and is characterized by comprising:

[0016] The signal conditioning module pre-processes the secondary voltage and secondary current signals of the electric energy meter entering the inspected gateway to obtain processed signals;

[0017] Converting the processed signal into a digital signal through an A / D sampling module;

[0018] generating standard electric energy data based on the digital signal by an electric energy metering module; and

[0019] The standard electric energy data and the electric energy pulse signal from the electric energy meter at the inspected gateway are compared and calculated by an electric energy error calculation module to determine the electric energy error of the electric energy meter at the inspected gateway.

[0020] The measurement module, plant power energy collection system and method provided in this application can realize the functions of synchronous power collection and online verification of multiple gateway power meters, meeting the needs of real-time monitoring and online diagnosis of the operating status of gateway power meters. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without exceeding the scope of protection required by this application.

[0022] Figure 1 It is a structural diagram of the power plant energy collection system according to the first embodiment of the present application.

[0023] Figure 2It is a structural diagram of a plant power energy collection system according to the second embodiment of the present application.

[0024] Figure 3 It is a structural diagram of a plant power energy collection system according to the third embodiment of the present application.

[0025] Figure 4 It is a structural diagram of a plant power energy collection system according to the fourth embodiment of the present application.

[0026] Figure 5 It is a structural diagram of a plant power energy collection system according to the fifth embodiment of the present application.

[0027] Figure 6 Schematic diagram of the structure of a measurement module according to an embodiment of the present application.

[0028] Figure 7 is a structural diagram of a measurement module according to another embodiment of the present application.

[0029] Figure 8 It is a flow chart of the power plant energy collection method according to the first embodiment of the present application.

[0030] Figure 9 It is a flow chart of the plant power energy collection method according to the second embodiment of the present application.

[0031] Figure 10 It is a flow chart of the plant power energy collection method according to the third embodiment of the present application.

[0032] Figure 11 It is a flow chart of the power plant energy collection method according to the fourth embodiment of the present application.

[0033] Figure 12 It is a flow chart of the power plant energy collection method according to the fifth embodiment of the present application.

[0034] Figure 13 It is a flow chart of the power plant energy collection method according to the sixth embodiment of the present application. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0036] Figure 1This is a schematic diagram of the structure of the power plant energy collection system according to the first embodiment of this application. Figure 1 As shown, the system includes a gateway energy meter and a measurement module. The measurement module is integrated into the gateway energy meter. Each measurement module can process data from a tested gateway energy meter. The measurement module reads the data from the tested energy meter, calculates and measures the data based on the tested energy meter, obtains relevant data, and sends the relevant data to the master station system for remote access and analysis. The relevant data may include the operating error of the tested energy meter, the clock indication deviation of the tested energy meter, the energy indication, the energy metering deviation, standard energy data, and power quality indicators.

[0037] Figure 2 This is a schematic diagram of the structure of the power plant energy collection system according to the second embodiment of the present application. Figure 2 As shown, the system includes a gateway electric energy meter and a measurement module, wherein the measurement module and the gateway electric energy meter are separately arranged, and each measurement module can process the data of a detected gateway electric energy meter. The measurement module reads the data of the detected electric energy meter, and calculates and measures according to the data of the detected electric energy meter to obtain relevant data, and sends the relevant data to the main station system for remote call and analysis.

[0038] Figure 3 This is a schematic diagram of the structure of the power plant energy collection system according to the third embodiment of the present application. Figure 3 As shown, the system includes a gateway electric energy meter, a measurement module and a plant electric energy collection terminal, wherein the measurement module is integrated in the gateway electric energy meter, the measurement module reads the data of the inspected electric energy meter, and calculates and measures according to the data of the inspected electric energy meter to obtain relevant data, thereby realizing online calibration of the gateway electric energy meter. The plant electric energy collection terminal establishes communication with the inspected electric energy meter through RS485 or Ethernet, and the measurement module sends the relevant data to the plant electric energy collection terminal in real time. The plant electric energy collection terminal sends the relevant data to the master station system for remote call and analysis. According to Figure 3 In the illustrated embodiment, the gateway electric energy meter and the power plant electric energy collection terminal adopt the existing communication architecture, which is easy to implement.

[0039] Figure 4 FIG. 1 is a schematic diagram of the structure of the power plant energy collection system according to the fourth embodiment of the present application. Figure 4 As shown in the figure, the system includes a gateway energy meter, a measurement module, and a power plant energy collection terminal. The measurement module is integrated into the power plant energy collection terminal. Each measurement module processes data from a gateway energy meter under inspection, and the collected data is uploaded to the power plant energy collection terminal in real time, enabling online calibration of the gateway energy meter. The power plant energy collection terminal sends the data to the master station system for remote access and analysis. Figure 4The illustrated embodiment integrates the measurement module into the power plant electricity energy collection terminal to construct an integrated device for electric energy data collection and online measurement, thereby enabling the online measurement module to perform real-time online calibration of the gateway electricity meter without changing the main metering circuit.

[0040] Figure 5 FIG is a schematic diagram of the structure of the power plant energy collection system according to the fifth embodiment of the present application. Figure 5 As shown, the system includes a gateway energy meter, a measurement module and a power plant energy collection terminal. The measurement module is independently set between the gateway energy meter and the power plant energy collection terminal. Each measurement module can process the data of a gateway energy meter under inspection, and the collected data is uploaded to the power plant energy collection terminal in real time to realize the online calibration of the gateway energy meter. The power plant energy collection terminal sends the data to the main station system for remote call and analysis. Figure 5 In the illustrated embodiment, the measurement module adopts a modular design with flexible and diverse deployment methods. It can be directly installed near the electric energy meter at the measured gateway, effectively shortening the voltage and current signal transmission path. Combined with the digital signal transmission technology between the measurement module and the acquisition terminal, it effectively eliminates the errors caused by analog signal attenuation and ensures high-precision output of measurement data.

[0041] The above implementation plans each have their own characteristics, providing construction workers with more possibilities. Construction workers can flexibly choose deployment according to on-site conditions.

[0042] Figure 6 FIG is a schematic diagram of the structure of a measurement module according to an embodiment of the present application. Figure 6 As shown, the measurement module includes a signal conditioning module, an A / D sampling module, an electric energy error calculation module and an electric energy metering module. The signal conditioning module is used to pre-process the secondary voltage and secondary current signals entering the electric energy meter at the gateway to be inspected to obtain a processed signal, wherein the pre-processing may include removing noise, removing interference, adjusting the signal amplitude, etc. The pre-processed signal is converted into a digital signal by the A / D sampling module and sent to the electric energy metering module, which generates standard electric energy data based on the digital signal. The method of generating standard electric energy data includes adopting a digital integration algorithm. In one embodiment, the electric energy error calculation module is used to directly collect the electric energy pulse signal of the electric energy meter at the gateway to be inspected, compare and calculate the electric energy pulse signal of the electric energy meter at the gateway to be inspected and the standard electric energy data, and determine the electric energy error of the electric energy meter at the gateway to be inspected. Figure 1 and Figure 3 The electric energy error calculation module in the illustrated embodiment can directly collect the electric energy pulse signal of the electric energy meter at the inspected gateway.

[0043] In one embodiment, Figure 6The measurement module shown may also include a pulse receiving module, which may be built into the energy error calculation module or independently provided. The pulse receiving module is used to receive energy pulse signals from the energy meter at the checkpoint under inspection. The energy error calculation module is used to receive the energy pulse signals from the energy meter at the checkpoint under inspection via the pulse receiving module, and to determine the energy error of the energy meter at the checkpoint under inspection by comparing the energy pulse signals with standard energy data. The pulse receiving module may include a photocoupler. Figure 2 、 Figure 4 and Figure 5 The electric energy error calculation module in the illustrated embodiment may directly collect the electric energy pulse signal of the electric energy meter at the inspected gateway, or may collect the electric energy pulse signal of the electric energy meter at the inspected gateway via the pulse receiving module.

[0044] In one embodiment, the A / D sampling module can be configured with 256 to 4096 times / cycle ultra-high frequency sampling, which increases the data sampling rate by 2 to 32 times compared to the conventional 128-times sampling scheme. The A / D sampling module can fully preserve the signal characteristics within the 5 to 100kHz frequency band through a 16 to 24-bit high-precision analog-to-digital converter and an anti-aliasing filter. The measurement module ensures sampling accuracy through 16 to 24-bit A / D conversion technology, and can be combined with an anti-aliasing filter and the powerful core of the electric energy metering module to achieve fast data processing, so that the accuracy of online monitoring reaches 0.1 / 0.05 / 0.02 / 0.01, which can meet the high-precision scenarios such as new energy grid connection.

[0045] This application has established a three-level redundant architecture of "main meter-slave meter-auxiliary meter", which significantly enhances the fault tolerance of the metering system. When the main meter and the auxiliary meter of the gateway electric energy meter fail to complete data collection due to extreme working conditions (such as electromagnetic interference, communication interruption, etc.), the "electricity collection module" of the power plant electric energy collection terminal cannot read data or the data is abnormal. At this time, the measurement module acts as an auxiliary meter to complete the metering task, and can directly provide electric energy measurement data as a reference during the period when the main and auxiliary meter data are missing, such as the standard electric energy data generated by the electric energy metering module.

[0046] Figure 7 is a structural diagram of a measurement module according to another embodiment of the present application. Figure 6 compared to, Figure 7The measurement module shown can also include a power quality monitoring module. In one embodiment, the power quality monitoring module can receive the digital signal sent by the A / D sampling module, perform calculations and analysis of power quality indicators, and determine power quality indicators. For example, it supports 100-2000 harmonic analysis and can accurately identify the interharmonic components generated by the grid connection of new energy sources; using a sliding time window algorithm to establish a 5ms event trigger threshold, it can accurately locate the starting point of the voltage sag and fully record the waveform of the 40 cycles before and after the event, meeting the requirements of the IEC international A standard, significantly improving the accuracy of grid fault analysis and the efficiency of power quality management, and providing data support for the stable operation of the new power system.

[0047] In an alternative embodiment, Figure 7 The measurement module shown may also include a downlink communication module and an energy collection module. In one embodiment, the downlink communication module establishes a communication connection with the energy meter at the gateway under inspection via, for example, an RS485 interface. The energy collection module reads energy data from the energy meter at the gateway under inspection via the downlink communication module. For example, it reads the total energy counter and the energy indication corresponding to each rate period at the energy meter at the gateway under inspection, and sends the data to the energy collection module to determine the energy indication. The communication protocol between the measurement module and the energy meter at the gateway under inspection may support the DL / T 645 protocol or the DL / T 698.45 protocol to enhance communication compatibility and reliability.

[0048] In an alternative embodiment, Figure 7 The measurement module shown may also include an electricity tracking module. The electricity tracking module is mainly used to track the measurement errors of the inspected electricity meter caused by the failure of the inspected electricity meter or the wiring error of the electricity meter. The electricity tracking module receives data from the electricity collection module and the electricity metering module, and senses whether the measurement of the inspected electricity meter is correct through the algorithm. If it is not correct, it performs electricity tracking calculation. In a specific embodiment, the electricity collection module provides the electricity data collected by the inspected electricity meter, and the electricity metering module provides the voltage and current phasors. The relationship between them is judged through the algorithm to derive the correct electricity data. The electricity tracking module compares the electricity data of the inspected electricity meter collected by the electricity collection module within a period of time with the standard electricity data derived by the electricity metering module within the same time period, and calculates the electricity metering deviation within the time period.

[0049] In an alternative embodiment, Figure 7The measurement module shown may also include a pulse receiving module, a clock synchronization module, and a clock error calculation module. In one embodiment, the pulse receiving module receives the current second pulse of the energy meter under inspection; the time synchronization module obtains time information from the station clock server as the measurement module's own clock information; and the clock error calculation module receives the second pulse of the energy meter under inspection and the measurement module's own clock information, performs a comparison and calculation, and determines the clock indication deviation of the energy meter under inspection.

[0050] The sampling point of the A / D sampling module is precisely controlled by the clock information output by the clock synchronization module. The module has a built-in FPGA to accurately control the sampling time of the A / D sampling module. Based on the sampling technology of the same time base, the sampling time of different measurement modules is precisely aligned (for example, at the nanosecond level), supporting real-time line loss calculation and wide-area metering. The master station calculates the power loss of the transmission line and the electric energy loss at any time period in real time by comparing the electric energy data provided by the measurement modules at both ends of the transmission line (for example, by comparing and calculating the data of the power acquisition modules at both ends, or by comparing the data of the electric energy metering modules at both ends). It constructs a new real-time line loss health analysis model and automatically generates a line loss health profile to support economic indicators, technical operation, leakage plugging and revenue increase analysis, and the formulation of measures related to line loss. Using the wide-area metering algorithm, the electric energy and demand in multi-power and multi-line operation modes are accurately calculated, effectively improving the accuracy of electric energy and demand settlement in complex power grids.

[0051] In an alternative embodiment, Figure 7 The measurement module shown may also include an uplink communication module. In one embodiment, the uplink communication module uploads the data to be transmitted to the master station system in real time through a variety of communication protocols and transmission methods to achieve remote monitoring. In a specific embodiment, the data to be transmitted may include: the power error of the inspected gateway power meter calculated by the power error calculation module, the clock indication deviation of the inspected power meter calculated by the clock error calculation module, the power indication of the power acquisition module, the power metering deviation of the power replenishment module, the standard power data of the power metering module, and the power quality index of the power quality monitoring module. In a specific embodiment, the transmission method can be high-speed Ethernet, fiber optic communication, dial-up channel, and 4G / 5G wireless channel, etc. The master station system calls the measurement module or the power energy acquisition terminal of the plant station to measure various functional data or the master station issues a reporting task, and the measurement module or the power energy acquisition terminal of the plant station actively reports data to the master station system according to the task configuration.

[0052] In an alternative embodiment, Figure 7 The measurement module shown may also include a standard electric energy pulse output module for converting the standard electric energy data generated by the electric energy metering module into a standard electric energy pulse signal, which can be calibrated with higher-level electric energy measurement equipment to ensure the measurement accuracy of the acquisition terminal.

[0053] In an alternative embodiment, Figure 7 The measurement module shown may also include a storage module for storing collected or calculated power errors, clock indication deviations, power indications, power metering deviations, standard power data, power quality indicators, calibration results, etc., to facilitate subsequent query and analysis.

[0054] In an alternative embodiment, Figure 7 The measurement module shown may also include a human-computer interaction module. The human-computer interaction module provides a user-friendly interface to facilitate operations such as parameter setting, data query, and troubleshooting.

[0055] In an optional embodiment, the power collection module, the power replenishment module, the power metering module, and the power quality monitoring module can be integrated into the CPU of the measurement module.

[0056] exist Figure 6 and Figure 7 Based on the measurement module shown, according to one aspect of the present application, a method for collecting power energy at a power plant is provided. Figure 8 FIG. 1 is a flow chart of a method for collecting power energy from a power plant according to the first embodiment of the present application. Figure 8 As shown, the method includes the following steps:

[0057] Step S801: pre-processing the secondary voltage and secondary current signals of the electric energy meter entering the inspected gateway through a signal conditioning module to obtain processed signals;

[0058] Step S802, converting the processed signal into a digital signal through an A / D sampling module;

[0059] Step S803, generating standard electric energy data based on the digital signal through an electric energy metering module; and

[0060] Step S804 : The electric energy error calculation module compares and calculates the standard electric energy data and the electric energy pulse signal from the electric energy meter at the inspected gateway to determine the electric energy error of the electric energy meter at the inspected gateway.

[0061] Figure 9 This is a flow chart of the power plant energy collection method according to the second embodiment of the present application. In an optional embodiment, Figure 8 compared to, Figure 9 Steps S901 to S904 in the method shown are the same as Figure 8 Steps S801 to S804 are the same except that: Figure 9 The illustrated method further includes:

[0062] Step S905 : The power quality monitoring module calculates and analyzes the digital signal from the A / D sampling module to determine a power quality index.

[0063] Figure 10 This is a flow chart of the power plant energy collection method according to the third embodiment of the present application. In an optional embodiment, Figure 8 compared to, Figure 10 Steps S1001 to S1004 in the method shown are the same as Figure 8 Steps S801 to S804 are the same except that: Figure 10 The illustrated method further includes:

[0064] Step S1005, reading the electric energy data of the electric energy meter at the inspected gateway via the electric energy collection module via the downlink communication module; and

[0065] Step S1006 : determining the electric energy metering deviation by the electric energy supplement module according to the standard electric energy data and the electric energy data of the electric energy meter at the inspected gateway from the electric energy collection module.

[0066] Figure 11 This is a flow chart of the power plant energy collection method according to the fourth embodiment of the present application. In an optional embodiment, Figure 8 compared to, Figure 11 Steps S1101 to S1104 in the method shown are the same as Figure 8 Steps S801 to S804 are the same except that: Figure 11 The illustrated method further includes:

[0067] Step S1105: Obtain the time information of the in-station clock server through the clock synchronization module as its own clock information;

[0068] Step S1106, receiving the current second pulse of the electric energy meter at the gateway under inspection through the pulse receiving module;

[0069] Step S1107: The clock error calculation module performs calculation based on the clock information of the clock itself and the current second pulse, and determines the clock indication deviation of the electric energy meter under inspection.

[0070] Figure 12 is a flow chart of a method for collecting power energy from a power plant according to the fifth embodiment of the present application. Figure 8 compared to, Figure 12 Steps S1201 to S1204 in the method shown are the same as Figure 8 Steps S801 to S804 are the same except that: Figure 12The illustrated method further includes:

[0071] Step S1205 : uploading the data to be transmitted to the master station system in real time through the uplink communication module according to a preset transmission method.

[0072] Figure 13 This is a flow chart of the power plant energy collection method according to the sixth embodiment of the present application. In an optional embodiment, Figure 8 compared to, Figure 13 Steps S1301 to S1304 in the method shown are the same as Figure 8 Steps S801 to S804 are the same except that: Figure 13 The illustrated method further includes:

[0073] Step S1305 : converting the standard electric energy data generated by the electric energy metering module into a standard electric energy pulse signal through a standard electric energy pulse output module.

[0074] The measurement module, plant power energy collection system and method provided in this application can realize the functions of synchronous power collection and online verification of multiple gateway power meters, meeting the needs of real-time monitoring and online diagnosis of the operating status of gateway power meters.

[0075] The embodiments of the present application are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only intended to help understand the method and core ideas of the present application. At the same time, changes or modifications made by those skilled in the art based on the ideas of the present application, the specific implementation methods, and the scope of application of the present application, all fall within the scope of protection of the present application. In summary, the contents of this specification should not be construed as limiting the present application.

Claims

1. A measurement module, characterized in that: include: The signal conditioning module is used to pre-process the secondary voltage and secondary current signals of the electric energy meter entering the inspected gateway to obtain processed signals; An A / D sampling module, configured to convert the processed signal into a digital signal; an electric energy metering module, configured to generate standard electric energy data based on the digital signal; as well as The electric energy error calculation module is used to compare and calculate the standard electric energy data and the electric energy pulse signal from the electric energy meter of the inspected gateway to determine the electric energy error of the electric energy meter of the inspected gateway.

2. The measurement module according to claim 1, wherein: Also includes: The power quality monitoring module is used to calculate and analyze the digital signal from the A / D sampling module to determine the power quality index.

3. The measurement module according to claim 1, wherein: Also includes: A downlink communication module, configured to establish a communication connection with the electric energy meter at the checkpoint; An electric energy collection module, connected to the downlink communication module, for reading the electric energy data of the electric energy meter at the inspected gateway; as well as The electric energy supplement module is used to determine the electric energy metering deviation according to the standard electric energy data and the electric energy data of the electric energy meter at the inspected gateway from the electric energy collection module.

4. The measurement module according to claim 1, wherein: Also includes: The clock synchronization module is used to obtain the time information of the clock server in the station as its own clock information; A pulse receiving module, configured to receive the current second pulse of the electric energy meter at the checkpoint; The clock error calculation module is used to perform calculation based on the clock information of the self-clock and the current second pulse to determine the clock indication deviation of the electric energy meter of the inspected gateway.

5. The measurement module according to any one of claims 1 to 4, wherein: Also includes: The uplink communication module is used to upload the data to be transmitted to the main station system in real time according to the preset transmission method.

6. The measurement module according to any one of claims 1 to 4, wherein: Also includes: The standard electric energy pulse output module is used to convert the standard electric energy data generated by the electric energy metering module into a standard electric energy pulse signal.

7. The measurement module according to any one of claims 1 to 4, wherein: The A / D sampling module is configured with an ultra-high frequency sampling of 256 to 4096 times per cycle.

8. A power plant electricity energy collection system, characterized in that: include: The electric energy meter at the gateway under inspection is used to collect the secondary current and secondary voltage of the secondary circuit and calculate the electric energy data based on the secondary current and the secondary voltage; as well as The measurement module according to any one of claims 1 to 7.

9. The power plant electric energy collection system according to claim 8, characterized in that: include: The plant electric energy collection terminal is used to receive data from the measurement module and send the data to the main station system.

10. The power plant electric energy collection system according to claim 8 or 9, characterized in that: The measurement module is integrated into the electric energy meter at the inspected gateway, or the measurement module is independently provided from the electric energy meter at the inspected gateway.

11. The power plant electric energy collection system according to claim 9, characterized in that: The measurement module is integrated into the power plant electric energy collection terminal.

12. A method for collecting power energy from a power plant, applied to a measurement module, characterized in that: include: The signal conditioning module pre-processes the secondary voltage and secondary current signals of the electric energy meter entering the inspected gateway to obtain processed signals; Converting the processed signal into a digital signal through an A / D sampling module; generating standard electric energy data based on the digital signal through an electric energy metering module; as well as The standard electric energy data and the electric energy pulse signal from the electric energy meter at the inspected gateway are compared and calculated by an electric energy error calculation module to determine the electric energy error of the electric energy meter at the inspected gateway.

13. The method according to claim 12, wherein: Also includes: The digital signal from the A / D sampling module is calculated and analyzed by the power quality monitoring module to determine the power quality index.

14. The method according to claim 12, wherein: Also includes: The electric energy data of the electric energy meter at the checkpoint is read by the electric energy collection module via the downlink communication module; as well as The electric energy metering deviation is determined by the electric energy supplement module according to the standard electric energy data and the electric energy data of the electric energy meter at the inspected gateway from the electric energy collection module.

15. The method according to claim 12, wherein Also includes: Obtain the time information of the station clock server through the clock synchronization module as its own clock information; Receive the current second pulse of the electric energy meter at the gateway under inspection through the pulse receiving module; The clock error calculation module performs calculation based on the clock information of the device and the current second pulse, and determines the clock indication deviation of the electric energy meter at the inspected gateway.

16. The method according to any one of claims 12 to 15, characterized in that Also includes: The data to be transmitted is uploaded to the main station system in real time through the uplink communication module according to the preset transmission method.

17. The method according to any one of claims 12 to 15, characterized in that Also includes: The standard electric energy data generated by the electric energy metering module is converted into a standard electric energy pulse signal through the standard electric energy pulse output module.

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