Dynamic data compression and decompression method of communication process of wide-area measurement system

Abstract

The invention discloses a dynamic data compression and decompression method of a communication process of a wide-area measurement system. According to the method, by researching a real-time dynamic data transmission protocol, a phasor measurement unit end selects complete data format transmission at an integral-second time and selects compressed data format transmission at a non-integral-second time, the phasor measurement unit end voltage compression process comprises DC_IDCODE compression, century second SOC compression, phasor data compression, frequency offset compression, frequency changerate compression, analog compression and digital compression, the phasor measurement unit end transmits a data frame to a data concentrator end, the data concentrator end identifies the format of thedata frame by detecting the format of the data frame transmitted by the phasor measurement unit end, and a compressed data frame is decompressed by reading a configuration frame and the data frame ofa previous moment and thus is restored to a data frame conforming to the transmission protocol.

Description

technical field [0001] The invention relates to the field of real-time dynamic monitoring systems of electric power systems, and more specifically relates to a method for compressing and decompressing dynamic data in the communication process of a wide-area measurement system. Background technique [0002] With climate change, a large number of new energy sources are connected to the grid, and the grid is facing more and more new challenges. The security, stable operation and real-time monitoring of the grid are becoming more and more important. At the same time, as my country's power grid develops toward intelligence, more and more intelligent equipment has begun to be put into the actual operation of the power grid, such as the phasor measurement unit (PMU). The phasor measurement unit is a device for the measurement and output of synchronized phasors and dynamic recording. Its core includes the synchronization phasor measurement based on the standard clock signal, the abi...

AI Technical Summary

Problems solved by technology

However, due to the large number of nodes in the entire network, the transmission rate (such as 100 frames per second) and the relatively slow change of most real-time data in the distribution network, there is a large amount of redundant data in the transmission process, and the transmission efficiency is low. Therefore, it is a technology worth studying to compress and transmit dynamic data and realize fast and lossless decompression.

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