A wide-area measurement mode intelligent inspection method for the measurement performance of digital electric energy meters

Abstract

The invention discloses a digital electric energy meter metering performance intelligent inspection method in a wide area measurement mode. The method comprises the following steps of establishing a wide area IEC 61850 standard message network, and updating a cloud digital electric energy meter comprehensive database according to device information data and history electric quantity and history check data of digital electric energy meters; intelligently selecting inspection objects according to attribute priority criteria and a detection period threshold in the comprehensive database; marking rated delay time and message arrival moments through sample value messages sent by a merging unit, and calculating a message practical sample moment; calculating that the electric energy between adjacent freezing moments is a check standard electric energy accumulation value of this time; calculating the electric accumulation value of the measured digital electric energy meters; calculating measurement errors of the measured digital electric energy meters; and intelligently selecting the inspection objects of next time. According to the method, the manual intervention can be reduced when the digital electric energy meters are checked, and the check working efficiency of the digital electric energy meters can be improved.

Description

technical field [0001] The invention relates to the technical field of electric energy measurement and testing of intelligent substations, in particular to an intelligent inspection method for the measurement performance of a digital electric energy meter in a wide-area measurement mode. Background technique [0002] Smart / digital substations are an important part of smart grids. Since the "Twelfth Five-Year Plan", the country has continued to increase investment in smart substations, and digital metering equipment for smart substations has been widely used. The digital energy meter is located at the end of the digital energy metering link, and its metering performance directly affects the fairness and justice of electric energy metering. As the national digital electric energy measurement system tends to be perfected, the assessment of digital electric energy meters will gradually increase. According to DL / T 448-2016 "Technical Management Regulations for Electric Energy Me...

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Problems solved by technology

There are the following problems in adopting the above-mentioned on-site calibration method to calibrate the digital electric energy meter: (1) the work efficiency of the on-site calibration method is extremely low, especially in mountainous areas, plateaus and other remote areas with poor climate and traffic conditions (such as Sichuan-Tibet, Qinghai-Tibet High Altitude areas, rough roads, frequent mountain torrents and mudslides in summer, and heavy snow and ice in winter, resulting in poor traffic conditions), generally the calibration work does not exceed 30 minutes, and the traffic journey generally takes more than 3 days, it is extremely difficult to guarantee power The meter can carry out periodic verification within the specified time; (2) The relevant information and verification plan of the digital metering equipment are managed manually, and the original verification plan cannot be modified in real time according to the change in the measurement performance of the electric energy meter. It is difficult to carry out targeted verification of digital energy meters at important gateways or hidden dangers based on historical and real-time data; (3) Since the merging unit is shared by protection, measurement and control, and metering equipment, on-site verification , it needs to be connected to the merged unit in operation, and there is a safety risk; (4) Professional training and experience accumulation are required to carry out calibration work by professionals, and there are differences in measurement results due to differences in calibration personnel; based on the above reasons, At present, a large number of digital energy meters in smart substations have not been calibrated on schedule, and operation and maintenance and management personnel cannot grasp their actual operation conditions.

[0004] On the premise of reducing manual intervention and improving the credibility of measurement, how to complete the calibration of digital energy meters in smart substations intelligently, safely, efficiently and on time has become a problem that people are generally concerned about. However, there is no corresponding technology today. There is no related report

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