Power line transmission time delay measurement method and device resistant to electric appliance interference and storage medium

Abstract

The invention discloses an electric appliance interference resistant power line transmission time delay measurement method and device and a storage medium, and belongs to the field of time delay measurement, and the method comprises the following steps: S1, changing the resistance value of a resistor at a receiving end, obtaining n groups of different input end voltage-current ratios, selecting an initial value, and setting a precision requirement; s2, calculating a mean square error matrix for time delay estimation according to the initial value, judging whether the modulus of the mean square error matrix is smaller than the set precision or not, if the modulus of the mean square error matrix is smaller than the set precision, obtaining an optimal solution and carrying out a step S4, and otherwise, carrying out a step S3; s3, determining a linear search direction according to the mean square error matrix, updating the initial value, and repeating the step S2 by using the updated initial value; and S4, obtaining an output time delay value according to parameters extracted from the optimal solution. On the premise of not influencing the work of a power grid, the online end-to-end transmission time delay measurement which resists the interference of electric appliances and is high in precision, small in size and low in cost can be realized.

Description

technical field [0001] The invention relates to the field of time delay measurement, in particular to a method, device and storage medium for measuring time delay of power line transmission which are resistant to electrical interference. Background technique [0002] In January 2019, the State Grid Corporation of China proposed the development strategy of "three types and two networks". Among them, two networks, namely "Strong Smart Grid" and "Ubiquitous Power Internet of Things", are the basic ways to realize the "Three Types". It is against this background that the State Grid Information and Communications Industry Group Corporation has proposed a solution for the optimization and improvement of business and distribution integration, and the Internet of Things for power distribution in low-voltage station areas is an important part of the construction of the ubiquitous Internet of Things for electric power. Based on low-voltage power line communication technology, guided ...

AI Technical Summary

Problems solved by technology

The end-to-end delay measured by this technology includes the additional signal phase delay caused by the complex impedance characteristics of the electrical appliances at both ends, so the measured delay is not proportional to the delay of the power line transmission line and cannot be accurately measured. Reflects the relative relationship of the end-to-end power line length, resulting in a decline in the accuracy of topology discovery

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