Performance Analysis of Power Data Compression Based on Beidou Short Messages

There are situations in the power grid information collection system in remote areas, such as weak and unstable signals. By using the Beidou short message service based on the satellite communication technology, the communication blind area and the transmission bit error rate can be reduced effectively. However, Beidou short message communication has the disadvantages of small transmission bandwidth and low communication frequency. In this paper, we focus on the IEC101 protocol message and CDT protocol message commonly used in the electricity information collection system. To address the communication challenges associated with these protocols, we propose a compression transmission mechanism based on Beidou short message, leveraging a lossless compression method. In order to maximize the utilization of BDS short message communication channel bandwidth, we design a mechanism for unpacking, grouping and reliable transmission long message within the BDS short message communication, and Huffman, LZ77, LZSS, LZW, LZMA are used for transmission segments of different lengths. Compression algorithm is used for compression test, and the average compression ratio and overall transmission time are analyzed. On the basis of balancing the compression ratio and real-time transmission, the appropriate length composition of the transmission message and the compression algorithm conforming to the message characteristics are discussed. The experimental results demonstrate that the LZMA compression algorithm improves the transmission efficiency of Beidou short messages in long-distance communication seenarios. Specifically, we split IEC101 protocol packets into 900 bytes and CDT protocol packets into 800 bytes, while the transmission is real-time and the transmission efficiency of the IEC101 protocol and CDT protocol messages in the communication of the electricity information acquisition system, is increased to 2.88 times and 2.56 times respectively.