There is no limit to creativity, and the instrument is invented. Today we introduce a national invention patent for invention - a digital energy meter online monitoring and evaluation system and method. The patent was applied for by the Guizhou Electric Power Research Institute and was granted an authorization announcement on May 10, 2017.
Description
The invention belongs to the technical field of electric energy measurement testing, and more particularly to a system and method for online monitoring and evaluation of digital electric energy meters.
Background of the invention
With the development of digitalization of power systems, digital metering systems have become more and more widely used. As an important part of the digital measurement system, the demand for digital energy meters is also growing. The input signal of the digital electric energy meter is an all-digital signal that is collected by an electronic current and voltage transformer and transmitted to the merging unit in accordance with the communication protocol of IEC61850-9-1 or IEC61850-9-2. The digital electric energy meter performs logical operations on the input current and voltage digital signals. In theory, there is no error in the active energy measurement. However, due to factors such as sampling accuracy, processor word length and time synchronization, errors must exist. In the actual operation, which factors have a great influence on the measurement error of the digital electric energy meter, whether the digital electric energy meter can work normally in the case of extreme working conditions such as a large number of high-order harmonics, and the abnormal event record of the digital electric energy meter Problems such as the reliability of work are all objects that need to be studied. Digital electric energy meters are still in the development stage, and there is no uniform standard for verification methods, value transmission, error judgment and reliability, which brings great obstacles to the development and large-scale application of digital electric energy meters.
The national standards and verification procedures for digital energy meters have not yet been published, and the existing research is on the field calibration of digital energy meters. There is no mention of long-term, online real-time monitoring and evaluation of the working status of digital energy meters. For example, the patent No. 201210545604.5 patent "A digital input type electric energy meter online calibration device" refers to an online verification method and device for a digital electric energy meter. The current research is mainly for the detection of the measurement error of the digital electric energy meter. For example, the patent No. 201210447903 .5, "A Digital Energy Meter Accuracy Evaluation System and Method" describes a digital The method of on-site testing of the electric energy meter can also simulate the abnormal state of packet loss, network storm, etc., and detect the potential, start and harmonic influence of the digital electric energy meter, but does not pay attention to the abnormal event recording function of the digital electric energy meter. . The "Special Requirements for Digital Energy Meters" clearly stipulates that digital energy meters should have a grid abnormal event recording function.
Summary of the invention
In view of the above technical problems, an object of the present invention is to provide a system for online monitoring and evaluation of a digital electric energy meter, which performs on-line monitoring of a digital electric energy meter that is actually operated. Through the data analysis and comparison, the measurement error of the digital energy meter and the reliability of the event recording function are monitored.
The invention provides a digital electric energy meter online monitoring and evaluation system, comprising: a merging unit for transmitting data to a plurality of digital electric energy meters and the remote computer through the switch, wherein the data comprises a voltage digital signal And a current digital signal; a switch: converting data outputted by a port of the merging unit into multiplexed data, and outputting the multiplexed data to the plurality of digital energy meters and the remote computer; RS485 Hub: collects the electrical energy values ​​and abnormal event records measured by the plurality of digital electric energy meters and sends them to the remote computer.
The figure shows the structure of the digital electric energy meter online monitoring and evaluation system of the present invention.
Remote computer: receiving the data from the switch, parsing the voltage and current values ​​by FFT conversion, and transmitting to the local computer, and analyzing whether a grid abnormal event occurs and storing the grid abnormal event, also from the RS485 hub Obtaining and storing the electrical energy value and the abnormal event measured by the plurality of digital electric energy meters.
a data transmission unit: recording the parsed voltage, current value, the grid abnormal event, the electrical energy value measured by the plurality of digital electric energy meters, and the abnormal event record in the remote computer through communication Transmitting back to the local computer; and local computer: calculating an electric energy value according to the parsed voltage and current value returned in the remote computer, and calculating the electric energy value in each metering period Comparing the electric energy values ​​measured by the plurality of digital electric energy meters, analyzing long-term online operation measurement errors of the plurality of digital electric energy meters; and further, according to the abnormality events of the power grid returned in the remote computer Comparing with the grid abnormal event records recorded by the plurality of digital electric energy meters, respectively analyzing the reliability of the long-term online running event recording function of the plurality of digital electric energy meters.
Compared with the prior art, the above technical solution conceived by the present invention has the following beneficial effects: the present invention finds influencing factors sensitive to the measurement error of the digital electric energy meter through data analysis and comparison, and promotes the correlation of the digital electric energy meter. The standard is introduced and improved as soon as possible; the digital electric energy meter to be evaluated is periodically frozen to ensure that the data returned by each digital electric energy meter is the data of the simultaneous point, avoiding the error caused by the time synchronization due to the return data, and improving the error. The accuracy of the measurement error assessment of the invention; the local computer analyzes the current and voltage data analyzed by the remote computer FFT to determine whether an abnormal event occurs, and then compares with the number of abnormal events recorded by the digital electric energy meter to analyze the digital electric energy meter. The reliability of abnormal event records promotes the application of new electronic energy metering devices such as electronic transformers and digital energy meters in digital substation energy metering systems, effectively solving the daily operation and maintenance of electric energy metering equipment in digital substations and long-term accuracy and reliability of energy metering. Sexual problems.
Description
The invention belongs to the technical field of electric energy measurement testing, and more particularly to a system and method for online monitoring and evaluation of digital electric energy meters.
Background of the invention
With the development of digitalization of power systems, digital metering systems have become more and more widely used. As an important part of the digital measurement system, the demand for digital energy meters is also growing. The input signal of the digital electric energy meter is an all-digital signal that is collected by an electronic current and voltage transformer and transmitted to the merging unit in accordance with the communication protocol of IEC61850-9-1 or IEC61850-9-2. The digital electric energy meter performs logical operations on the input current and voltage digital signals. In theory, there is no error in the active energy measurement. However, due to factors such as sampling accuracy, processor word length and time synchronization, errors must exist. In the actual operation, which factors have a great influence on the measurement error of the digital electric energy meter, whether the digital electric energy meter can work normally in the case of extreme working conditions such as a large number of high-order harmonics, and the abnormal event record of the digital electric energy meter Problems such as the reliability of work are all objects that need to be studied. Digital electric energy meters are still in the development stage, and there is no uniform standard for verification methods, value transmission, error judgment and reliability, which brings great obstacles to the development and large-scale application of digital electric energy meters.
The national standards and verification procedures for digital energy meters have not yet been published, and the existing research is on the field calibration of digital energy meters. There is no mention of long-term, online real-time monitoring and evaluation of the working status of digital energy meters. For example, the patent No. 201210545604.5 patent "A digital input type electric energy meter online calibration device" refers to an online verification method and device for a digital electric energy meter. The current research is mainly for the detection of the measurement error of the digital electric energy meter. For example, the patent No. 201210447903 .5, "A Digital Energy Meter Accuracy Evaluation System and Method" describes a digital The method of on-site testing of the electric energy meter can also simulate the abnormal state of packet loss, network storm, etc., and detect the potential, start and harmonic influence of the digital electric energy meter, but does not pay attention to the abnormal event recording function of the digital electric energy meter. . The "Special Requirements for Digital Energy Meters" clearly stipulates that digital energy meters should have a grid abnormal event recording function.
Summary of the invention
In view of the above technical problems, an object of the present invention is to provide a system for online monitoring and evaluation of a digital electric energy meter, which performs on-line monitoring of a digital electric energy meter that is actually operated. Through the data analysis and comparison, the measurement error of the digital energy meter and the reliability of the event recording function are monitored.
The invention provides a digital electric energy meter online monitoring and evaluation system, comprising: a merging unit for transmitting data to a plurality of digital electric energy meters and the remote computer through the switch, wherein the data comprises a voltage digital signal And a current digital signal; a switch: converting data outputted by a port of the merging unit into multiplexed data, and outputting the multiplexed data to the plurality of digital energy meters and the remote computer; RS485 Hub: collects the electrical energy values ​​and abnormal event records measured by the plurality of digital electric energy meters and sends them to the remote computer.
The figure shows the structure of the digital electric energy meter online monitoring and evaluation system of the present invention.
Remote computer: receiving the data from the switch, parsing the voltage and current values ​​by FFT conversion, and transmitting to the local computer, and analyzing whether a grid abnormal event occurs and storing the grid abnormal event, also from the RS485 hub Obtaining and storing the electrical energy value and the abnormal event measured by the plurality of digital electric energy meters.
a data transmission unit: recording the parsed voltage, current value, the grid abnormal event, the electrical energy value measured by the plurality of digital electric energy meters, and the abnormal event record in the remote computer through communication Transmitting back to the local computer; and local computer: calculating an electric energy value according to the parsed voltage and current value returned in the remote computer, and calculating the electric energy value in each metering period Comparing the electric energy values ​​measured by the plurality of digital electric energy meters, analyzing long-term online operation measurement errors of the plurality of digital electric energy meters; and further, according to the abnormality events of the power grid returned in the remote computer Comparing with the grid abnormal event records recorded by the plurality of digital electric energy meters, respectively analyzing the reliability of the long-term online running event recording function of the plurality of digital electric energy meters.
Compared with the prior art, the above technical solution conceived by the present invention has the following beneficial effects: the present invention finds influencing factors sensitive to the measurement error of the digital electric energy meter through data analysis and comparison, and promotes the correlation of the digital electric energy meter. The standard is introduced and improved as soon as possible; the digital electric energy meter to be evaluated is periodically frozen to ensure that the data returned by each digital electric energy meter is the data of the simultaneous point, avoiding the error caused by the time synchronization due to the return data, and improving the error. The accuracy of the measurement error assessment of the invention; the local computer analyzes the current and voltage data analyzed by the remote computer FFT to determine whether an abnormal event occurs, and then compares with the number of abnormal events recorded by the digital electric energy meter to analyze the digital electric energy meter. The reliability of abnormal event records promotes the application of new electronic energy metering devices such as electronic transformers and digital energy meters in digital substation energy metering systems, effectively solving the daily operation and maintenance of electric energy metering equipment in digital substations and long-term accuracy and reliability of energy metering. Sexual problems.
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