3results about How to "Improve data compression ratio" patented technology

This invention provides a method and system for compressing power messages, relating to the field of power system control technology. The method includes: acquiring power messages via a first FPGA; timestamping the acquired power messages; caching the timestamped messages in a first shared memory; extracting messages from the first shared memory; parsing the messages according to their type and classifying and storing them in a second shared memory; extracting messages from the second shared memory by control block using a second FPGA; compressing the compressed packages corresponding to the control blocks; storing the compressed packages in a third shared memory; packaging and secondary compression according to a set time period; generating a total compressed package for that time period; and storing it on an SSD for dual-disk storage. This invention effectively reduces the storage space requirements for historical messages, improves the storage time of historical messages, and solves the problem of frequent failures in storing historical messages for post-event analysis of power systems.

The invention discloses a compression representation method for fundamental wave parameters in alternating current parameters, and the method comprises the following steps: for each phase of electrical parameter of a three-phase alternating current, compressing sign bits of a real part and an imaginary part of a fundamental wave to the last 2 bits of corresponding power when a full wave is greater than a certain preset value, the sign bit of the fundamental current is compressed to the last two bits of the active power, and the sign bit of the fundamental voltage is compressed to the last two bits of the reactive power. The compression method is visual, rapid and convenient to use, and the comprehensive precision of three-phase alternating current signal measurement cannot be reduced.

The present invention discloses a storage and reading method for classified raster data. The storage method includes: dividing the original classified raster data Data into statistical blocks with the unit statistical area as the minimum granularity, and storing the classification information of each statistical block; in order to improve the efficiency of reading the classification information of the statistical blocks of any row and column numbers from the data file in the future, recording the total storage space size value required for storing the classification information of all statistical blocks in each row; and storing the metadata information of the original classified raster data Data. The method can ensure the accuracy of the total number of classified pixels in each statistical block, and can use less storage space to record the distribution of each classified pixel by using the distribution flag data in the statistical block, and has a high data compression rate and flexible data accuracy control, and is suitable for various common classified raster data.