一种基于SCD文件的合并单元高速数据压缩方法  

High Speed Data Compression Method of Merge Unit Based on SCD File

作　　者：陈星田 熊小伏[2] 白勇[1] 胡海洋 CHEN Xingtian;XIONG Xiaofu;BAI Yong;HU Haiyang(Chongqing Electric Power College,Chongqing 400053,China;State Key Laboratory of Power Transmission Equipment&System Security and New Technology(ChongQing University),Chongqing 400044,China)

机构地区：[1]重庆电力高等专科学校,重庆400053 [2]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆400044

出　　处：《计算机科学》2023年第12期123-129,共7页Computer Science

基　　金：重庆市自然科学基金(CSTB2022NSCQ-MSX0251)。

摘　　要：在现代智能电网中,智能变电站安装了大量合并单元来同步发布电流互感器和电压互感器的暂态量,这些暂态数据有必要保存长达数年,从而覆盖设备生命周期,为设备状态维修、可靠性等研究提供原始信息支撑,但是如此长时与高频的海量数据给存储设备带来了巨大压力。文中首先将高频暂态数据分为固定不变的、状态变化的和周期变化的3种形式来进行预处理,将固定不变部分用SCD文件中的唯一标识代替,状态变化部分用事件记录文件代替,周期变化部分用SCD文件中双通道差量和周期差量来表示。然后使用16位哈夫曼完成最终压缩编码,并对比测试了各种预处理前后的压缩结果和不同编码的压缩结果。最终的测试结果表明该压缩方法比普通硬件压缩卡压缩比更大,压缩速率比普通压缩卡更快。In modern smart grid,many merging units are installed in smart substation to release transient data of current transformer and voltage transformer synchronously,these transient data need to be saved for several years,so as to cover the life cycle of equipment and provide original information support for condition maintenance and reliability of equipment,but such long-time and high-frequency massive data is a difficult problem for storage equipment.In this paper,the high-frequency transient data are preprocessed in three forms:fixed,state-changing and periodic-changing.Tthe fixed part is replaced by merge's APPID in SCD file,the state-changing part is replaced by event record file,and the periodic-changing part is represented by two-channel diffe-rence and periodic difference in SCD file,and the final compression coding is completed with 16-bit Huffman.The final test shows that the compression ratio of this compression method is larger than that of common hardware compression card,and the compression rate is faster than that of common compression card.

关 键 词：合并单元采样值 无损数据压缩 哈夫曼编码 LZMA压缩算法 小波变换 

分 类 号：TP391[自动化与计算机技术—计算机应用技术] TM734[自动化与计算机技术—计算机科学与技术]