Metrology module and substation power energy collection system

Abstract

This application relates to a measurement module and a power plant energy acquisition system. The measurement module includes: a signal conditioning module for preprocessing the secondary voltage and secondary current signals entering the tested energy meter to obtain a processed signal; an A / D sampling module for converting the processed signal into a digital signal; an energy metering module for generating standard energy data based on the digital signal; and an energy error calculation module for comparing and calculating the standard energy data and the energy pulse signal from the tested energy meter to determine the energy error of the tested energy meter. The solution of this application enables synchronous energy acquisition and online verification of multiple energy meters, meeting the needs for real-time monitoring and online diagnosis of the operating status of the energy meters.

Description

Technical Field

[0001] This application relates to the field of electricity meter monitoring technology, and in particular to measurement modules and power plant power energy acquisition systems. Background Technology

[0002] In the power system, the meter at the gateway is a key device for calculating the operating efficiency of the power grid. Its metering accuracy and reliability are directly related to the fairness of electricity trading, the efficiency of new energy consumption, and the economic efficiency of power grid operation.

[0003] Currently, according to the relevant provisions of 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 6 months, Class II devices every 12 months, and Class III devices every 24 months. However, this traditional periodic inspection method has many shortcomings.

[0004] Traditional manual on-site periodic inspection methods cannot monitor the operating status of electricity meters in real time, and untraceable measurement deviations may occur between two inspection cycles.

[0005] The existing power data acquisition terminals only play the role of collecting, storing, and uploading power data from the gate power meters. In terms of data acquisition dimensions, frequency, and real-time performance, they are mainly designed around scheduling needs, making it difficult for existing power metering devices to meet the needs of real-time monitoring and online diagnosis of the operating status of the gate power meters. Utility Model Content

[0006] To address the shortcomings of traditional electricity metering systems that rely on periodic inspections and lack a continuous equipment condition assessment mechanism, this application proposes an "online monitoring-dynamic calibration" solution. This solution utilizes a high-precision electrical parameter acquisition unit combined with an online calibration algorithm to achieve online closed-loop control of metering accuracy. Furthermore, this application proposes a power plant electricity acquisition system to achieve synchronous electricity acquisition and online verification of key electricity meters. This system features ultra-high frequency sampling, high precision, high efficiency, and high reliability.

[0007] According to a first aspect of this application, a measurement module is provided, characterized in that it comprises:

[0008] The signal conditioning module is used to preprocess the secondary voltage and secondary current signals of the energy meter entering the tested gate to obtain the processed signal.

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

[0010] An energy metering module is used to generate standard energy data based on the digital signal; and

[0011] The power error calculation module is used to compare and calculate the standard power data and the power pulse signal from the power meter under test to determine the power error of the power meter under test.

[0012] According to a second aspect of this application, a power plant electrical energy harvesting system is provided, characterized in that it comprises:

[0013] The inspected energy meter is used to collect the secondary current and secondary voltage of the secondary circuit, and to calculate energy data based on the secondary current and secondary voltage; and

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

[0015] The measurement module and power plant energy acquisition system provided in this application can realize functions such as synchronous energy acquisition and online verification of multiple energy meters, and meet the needs of real-time monitoring and online diagnosis of the operating status of energy meters. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings, without exceeding the scope of protection claimed by this application.

[0017] Figure 1 This is a schematic diagram of the structure of a power plant electrical energy harvesting system according to the first embodiment of this application.

[0018] Figure 2 This is a schematic diagram of the structure of a power plant electrical energy harvesting system according to the second embodiment of this application.

[0019] Figure 3 This is a schematic diagram of the structure of a power plant electrical energy harvesting system according to the third embodiment of this application.

[0020] Figure 4 This is a schematic diagram of the structure of a power plant electrical energy harvesting system according to the fourth embodiment of this application.

[0021] Figure 5 This is a schematic diagram of the structure of a power plant electrical energy harvesting system according to the fifth embodiment of this application.

[0022] Figure 6 This is a schematic diagram of the structure of a measurement module according to an embodiment of this application.

[0023] Figure 7 This is a schematic diagram of the structure of a measurement module according to another embodiment of this application.

[0024] Figure 8 This is a flowchart illustrating the power energy harvesting method for power plants according to the first embodiment of this application.

[0025] Figure 9 This is a flowchart illustrating the power energy harvesting method for power plants according to the second embodiment of this application.

[0026] Figure 10 This is a flowchart illustrating the power generation method for power plants according to the third embodiment of this application.

[0027] Figure 11 This is a flowchart illustrating the power energy harvesting method for power plants according to the fourth embodiment of this application.

[0028] Figure 12 This is a flowchart illustrating the power energy harvesting method for power plants according to the fifth embodiment of this application.

[0029] Figure 13 This is a flowchart illustrating the power energy harvesting method for power plants according to the sixth embodiment of this application. Detailed Implementation

[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] Figure 1 This is a schematic diagram of the structure of a power plant electrical energy harvesting system according to the first embodiment of this application. Figure 1 As shown, the system includes a gate energy meter and a measurement module. The measurement module is integrated into the gate energy meter. Each measurement module can process the data of one gate energy meter under test. The measurement module reads the data from the tested energy meter, calculates and measures based on the data, obtains relevant data, and sends the relevant data to the main 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 energy quality indicators.

[0032] Figure 2 This is a schematic diagram of the structure of a power plant electrical energy harvesting system according to the second embodiment of this application. Figure 2As shown, the system includes a gate energy meter and a measurement module. The measurement module is set up separately from the gate energy meter. Each measurement module can process the data of one gate energy meter under test. The measurement module reads the data of the energy meter under test, calculates and measures based on the data of the energy meter under test, obtains relevant data, and sends the relevant data to the main station system for remote access and analysis.

[0033] Figure 3 This is a schematic diagram of the structure of a power plant electrical energy harvesting system according to the third embodiment of this application. Figure 3 As shown, the system includes a gate energy meter, a measurement module, and a power station energy acquisition terminal. The measurement module is integrated into the gate energy meter. It reads data from the meter under test, calculates and measures based on this data, and obtains relevant data to achieve online calibration of the gate energy meter. The power station energy acquisition terminal establishes communication with the meter under test via RS485 or Ethernet. The measurement module sends relevant data to the power station energy acquisition terminal in real time, and the power station energy acquisition terminal sends the relevant data to the main station system for remote access and analysis. Figure 3 The embodiment shown uses existing communication architecture for the energy meter at the gateway and the power plant energy acquisition terminal, which is convenient to implement.

[0034] Figure 4 This is a schematic diagram of the structure of a power plant electrical energy harvesting system according to the fourth embodiment of this application. Figure 4 As shown, the system includes a gate energy meter, a measurement module, and a power station energy acquisition terminal. The measurement module is integrated into the power station energy acquisition terminal. Each measurement module can process data from one gate energy meter under test. The collected data is uploaded to the power station energy acquisition terminal in real time, enabling online calibration of the gate energy meters. The power station energy acquisition terminal sends the data to the main station system for remote access and analysis. Figure 4 The embodiment shown integrates the measurement module into the power energy acquisition terminal of the plant, constructing an integrated device for power energy data acquisition and online measurement. This enables real-time online calibration of the gate power meter by the online measurement module without changing the main metering circuit.

[0035] Figure 5 This is a schematic diagram of the structure of a power plant electrical energy harvesting system according to the fifth embodiment of this application. Figure 5 As shown, the system includes a gate energy meter, a measurement module, and a power plant energy acquisition terminal. The measurement module is independently positioned between the gate energy meter and the power plant energy acquisition terminal. Each measurement module can process data from one gate energy meter under test. The collected data is uploaded to the power plant energy acquisition terminal in real time, enabling online calibration of the gate energy meters. The power plant energy acquisition terminal sends the data to the main station system for remote access and analysis. Figure 5 In the embodiment shown, the measurement module adopts a modular design and can be deployed in a variety of ways. It can be directly installed near the measured energy meter, 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 error caused by analog signal attenuation and ensures high-precision output of measurement data.

[0036] Each of the above implementation plans has its own characteristics, providing construction workers with more possibilities and allowing them to flexibly choose deployments based on site conditions.

[0037] Figure 6 This is a schematic diagram of the structure of a measurement module according to an embodiment of this application. Figure 6 As shown, the measurement module includes a signal conditioning module, an A / D sampling module, an energy error calculation module, and an energy metering module. The signal conditioning module preprocesses the secondary voltage and secondary current signals entering the energy meter under test to obtain a processed signal. Preprocessing may include noise removal, interference removal, and signal amplitude adjustment. The preprocessed signal is converted into a digital signal by the A / D sampling module and sent to the energy metering module. The energy metering module generates standard energy data based on the digital signal. The standard energy data can be generated using a digital integration algorithm. In one embodiment, the energy error calculation module directly acquires the energy pulse signal from the energy meter under test, compares the energy pulse signal with the standard energy data, and calculates the energy error of the energy meter under test. Figure 1 and Figure 3 The power error calculation module in the illustrated embodiment can directly collect the power pulse signal of the power meter at the inspected checkpoint.

[0038] In one embodiment, Figure 6 The measurement module shown may also include a pulse receiving module, which can be built into the energy error calculation module or set up independently. The pulse receiving module receives the energy pulse signal from the energy meter under test. The energy error calculation module receives the energy pulse signal from the energy meter under test via the pulse receiving module, compares the energy pulse signal with standard energy data, and calculates the energy error of the energy meter under test. The pulse receiving module may include an optocoupler. Figure 2 , Figure 4 and Figure 5 The energy error calculation module in the illustrated embodiment can directly collect the energy pulse signal of the energy meter under test, or it can collect the energy pulse signal of the energy meter under test via the pulse receiving module.

[0039] In one embodiment, the A / D sampling module can be configured with an ultra-high frequency sampling rate of 256–4096 cycles / Hz, which is 2–32 times higher than the conventional 128-cycle sampling scheme. The A / D sampling module, through a 16–24-bit high-precision analog-to-digital converter and an anti-aliasing filter, can fully preserve the signal characteristics within the 5–100kHz frequency band. The measurement module ensures sampling accuracy through 16–24-bit A / D conversion technology and, in conjunction with an anti-aliasing filter and the powerful core of the energy metering module, achieves rapid data processing, enabling online monitoring accuracy to reach levels of 0.1 / 0.05 / 0.02 / 0.01, meeting the high-precision requirements of scenarios such as new energy grid connection.

[0040] This application constructs a three-level redundant architecture of "main meter - secondary meter - auxiliary meter", which significantly enhances the fault tolerance of the metering system. When both the main meter and the secondary meter at the gateway fail to complete data acquisition due to extreme operating conditions (such as electromagnetic interference, communication interruption, etc.), the "electricity acquisition module" of the power plant's power acquisition terminal cannot read data or the data is abnormal. At this time, the measurement module, as an auxiliary meter, completes the metering task and can directly provide power measurement data as a reference during the period when the main and secondary meters are missing data, such as standard power data generated by the power metering module.

[0041] Figure 7 This is a schematic diagram of the structure of a measurement module according to another embodiment of this application. Figure 6 compared to, Figure 7 The measurement module shown may also include a power quality monitoring module. In one embodiment, the power quality monitoring module can receive digital signals sent by the A / D sampling module, perform calculations and analyses of power quality indicators, and determine the power quality indicators. For example, it supports harmonic analysis from 100 to 2000th order, accurately identifying interharmonic components generated by new energy grid connection; using a sliding time window algorithm to establish a 5ms event trigger threshold, it can accurately locate the voltage sag initiation point, completely record the waveform of 40 cycles before and after the event, meet the requirements of IEC international A standard, significantly improve the accuracy of grid fault analysis and the efficiency of power quality management, and provide data support for the stable operation of new power systems.

[0042] In one alternative embodiment, Figure 7 The measurement module shown may further include a downlink communication module and a power acquisition module. In one embodiment, the downlink communication module establishes a communication connection with the tested energy meter via, for example, an RS485 interface. The power acquisition module reads the energy data of the tested energy meter via the downlink communication module, such as reading the total energy counter and the corresponding energy readings for each tariff period of the tested energy meter and sending them to the power acquisition module to determine the energy readings. The communication protocol between the measurement module and the tested energy meter can support the DL / T 645 protocol and the DL / T 698.45 protocol to enhance communication compatibility and reliability.

[0043] In one alternative embodiment, Figure 7 The measurement module shown may also include a power consumption correction module. This module is primarily used to correct metering errors caused by faults in the tested energy meter or wiring errors. The power consumption correction module receives data from the power acquisition module and the energy metering module, and uses an algorithm to determine if the tested energy meter's metering is correct. If incorrect, it performs power consumption correction calculations. In one specific embodiment, the power acquisition module provides energy data collected by the tested energy meter, and the energy metering module provides voltage and current phasors. An algorithm determines their relationship and derives the correct energy data. The power consumption correction module compares the energy data collected by the tested energy meter from the power acquisition module over a period of time with the standard energy data derived by the energy metering module within the same time period, calculating the energy metering deviation for that period.

[0044] In one alternative embodiment, Figure 7 The measurement module shown may further 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 test; the time synchronization module obtains the time information from the station's clock server as the measurement module's own clock information; the clock error calculation module receives the second pulse of the energy meter under test and the measurement module's own clock information, compares and calculates them to obtain the clock indication deviation of the energy meter under test.

[0045] The sampling time 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 that precisely controls the sampling time of the A / D sampling module. Based on sampling technology using the same time base, the sampling times of different measurement modules are precisely aligned (e.g., at the nanosecond level), supporting real-time line loss calculation and wide-area metering. The main station compares the power data provided by the measurement modules at both ends of the transmission line (e.g., comparing data from the power acquisition modules at both ends, or comparing data from the power metering modules at both ends) to calculate the power loss of the transmission line and the power loss at any time period in real time. This constructs a new real-time line loss health analysis model, automatically generating a line loss health profile to support economic indicators, technical operation, leak prevention and revenue increase analysis, and measure formulation related to line loss. Using wide-area metering algorithms, the power and demand are accurately calculated under multi-source and multi-line operation modes, effectively improving the accuracy of power and demand settlement under complex power grids.

[0046] In one alternative embodiment, Figure 7The 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 various communication protocols and transmission methods to achieve remote monitoring. In a specific embodiment, the data to be transmitted may include: the energy error of the tested energy meter calculated by the energy error calculation module, the clock indication deviation of the tested energy meter calculated by the clock error calculation module, the energy indication of the energy acquisition module, the energy metering deviation of the energy compensation module, the standard energy data of the energy metering module, and the energy quality indicators of the energy quality monitoring module. In a specific embodiment, the transmission method may 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 station energy acquisition terminal to collect various functional data or issues a reporting task to the master station system. The measurement module or the power station energy acquisition terminal actively reports data to the master station system according to the task configuration.

[0047] In one alternative embodiment, Figure 7 The measurement module shown may also include a standard energy pulse output module, which converts the standard energy data generated by the energy metering module into a standard energy pulse signal. This signal can be calibrated with higher-level energy measurement equipment to ensure the measurement accuracy of the acquisition terminal.

[0048] In one alternative embodiment, Figure 7 The measurement module shown may also include a storage module for storing the collected or calculated power error, clock indication deviation, power indication, power metering deviation, standard power data, power quality indicators, calibration results, etc., for easy subsequent query and analysis.

[0049] In one alternative embodiment, Figure 7 The measurement module shown may also include a human-machine interface module. This module provides a user-friendly interface, facilitating parameter setting, data querying, and troubleshooting.

[0050] In one optional embodiment, the power acquisition module, power tracking module, power metering module, and power quality monitoring module can be integrated into the CPU of the measurement module.

[0051] exist Figure 6 and Figure 7 Based on the measurement module shown, according to one aspect of this application, a method for collecting electrical energy in power plants is provided. Figure 8 This is a flowchart illustrating the power plant energy harvesting method according to the first embodiment of this application. Figure 8 As shown, the method includes the following steps:

[0052] Step S801: The secondary voltage and secondary current signals of the energy meter entering the test gate are preprocessed by the signal conditioning module to obtain the processed signal.

[0053] Step S802: The processed signal is converted into a digital signal by the A / D sampling module;

[0054] Step S803: The power metering module generates standard power data based on the digital signal; and

[0055] Step S804: The standard energy data and the energy pulse signal from the energy meter under test are compared and calculated by the energy error calculation module to determine the energy error of the energy meter under test.

[0056] Figure 9 This is a flowchart illustrating the power plant energy harvesting method according to the second embodiment of this application. In an optional embodiment, with... Figure 8 compared to, Figure 9 Steps S901 to S904 in the method shown are Figure 8 Steps S801 to S804 shown are the same, except that, Figure 9 The method shown also includes:

[0057] Step S905: The power quality monitoring module calculates and analyzes the digital signal from the A / D sampling module to determine the power quality index.

[0058] Figure 10 This is a flowchart illustrating the power plant energy harvesting method according to the third embodiment of this application. In an optional embodiment, with... Figure 8 compared to, Figure 10 Steps S1001 to S1004 in the method shown are Figure 8 Steps S801 to S804 shown are the same, except that, Figure 10 The method shown also includes:

[0059] Step S1005: The power data of the tested energy meter is read via the downlink communication module through the power acquisition module; and

[0060] Step S1006: The power tracking module determines the power metering deviation based on the standard power data and the power data from the tested gate power meter obtained from the power acquisition module.

[0061] Figure 11 This is a flowchart illustrating the power plant energy harvesting method according to the fourth embodiment of this application. In an optional embodiment, with... Figure 8 compared to, Figure 11 Steps S1101 to S1104 in the method shown are Figure 8Steps S801 to S804 shown are the same, except that, Figure 11 The method shown also includes:

[0062] Step S1105: Obtain the time information of the station's clock server through the clock synchronization module and use it as the station's own clock information;

[0063] Step S1106: Receive the current second pulse of the tested energy meter through the pulse receiving module;

[0064] Step S1107: The clock error calculation module calculates the clock indication deviation of the tested energy meter based on its own clock information and the current second pulse.

[0065] Figure 12 This is a flowchart illustrating the power plant energy harvesting method according to the fifth embodiment of this application. In an optional embodiment, with... Figure 8 compared to, Figure 12 Steps S1201 to S1204 in the method shown are Figure 8 Steps S801 to S804 shown are the same, except that, Figure 12 The method shown also includes:

[0066] Step S1205: 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.

[0067] Figure 13 This is a flowchart illustrating the power harvesting method for power plants according to the sixth embodiment of this application. In an optional embodiment, with... Figure 8 compared to, Figure 13 Steps S1301 to S1304 in the method shown are Figure 8 Steps S801 to S804 shown are the same, except that, Figure 13 The method shown also includes:

[0068] Step S1305: The standard energy data generated by the energy metering module is converted into a standard energy pulse signal through the standard energy pulse output module.

[0069] The measurement module and power plant energy acquisition system provided in this application can realize functions such as synchronous energy acquisition and online verification of multiple energy meters, and meet the needs of real-time monitoring and online diagnosis of the operating status of energy meters.

[0070] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the solution and core ideas of this application. Furthermore, any changes or modifications made by those skilled in the art based on the ideas of this application, and on the specific implementation methods and application scope of this application, are all within the scope of protection of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A metrology module, comprising: include: The signal conditioning module is used to preprocess the secondary voltage and secondary current signals of the energy meter entering the tested gate to obtain the processed signal. An A / D sampling module is used to convert the processed signal into a digital signal; The power metering module is used to generate standard power data based on the digital signal; as well as The power error calculation module is used to compare and calculate the standard power data and the power pulse signal from the power meter under test to determine the power error of the power meter under test.

2. The metrology module of 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 power quality indicators.

3. The metrology module of claim 1, wherein, Also includes: The downlink communication module is used to establish a communication connection with the energy meter at the inspected checkpoint. The power acquisition module is connected to the downlink communication module and is used to read the power data of the power meter at the inspected checkpoint. as well as The power tracking module is used to determine the power metering deviation based on the standard power data and the power data from the tested gate power meter obtained from the power acquisition module.

4. The metrology module of claim 1, wherein, Also includes: The clock synchronization module is used to obtain time information from the station's clock server and use it as its own clock information; A pulse receiving module is used to receive the current second pulse of the energy meter under inspection. The clock error calculation module is used to calculate and determine the clock indication deviation of the tested energy meter based on its own clock information and the current second pulse.

5. The measurement module as described in any one of claims 1 to 4, characterized in that, 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 as described in any one of claims 1 to 4, characterized in that, Also includes: A standard energy pulse output module is used to convert the standard energy data generated by the energy metering module into a standard energy pulse signal.

7. The measurement module as described in any one of claims 1 to 4, characterized in that, The A / D sampling module is configured with an ultra-high frequency sampling rate of 256 to 4096 times per cycle.

8. A power plant electrical energy harvesting system, characterized in that, include: The energy meter at the inspected checkpoint is used to collect the secondary current and secondary voltage of the secondary circuit, and to calculate the energy data based on the secondary current and secondary voltage. as well as The measurement module as described in any one of claims 1 to 7.

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

10. The power plant energy harvesting system as described in claim 8 or 9, characterized in that, The measurement module is integrated into the energy meter under test, or the measurement module is set up independently of the energy meter under test.

11. The power plant energy acquisition system as described in claim 9, characterized in that, The measurement module is integrated into the power plant's electrical energy acquisition terminal.

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