Comparison of Different Differential Coding based Algorithms Developed for Compressing Power System Operational Data

High sampling frequency of modern devices are responsible for generating enormous volume of data. Preservation of such data becomes extremely important for many applications. Power System Operation also involves enormous volume of information which if compressed will not only result in reduced memory requirement but will be also useful for data communication. Based on the analysis of practical power system operational data, a low computational, lossless compression algorithm, Differential Binary Encoding Algorithm (DBEA) is developed. Subsequently, Extended-DBEA (E-DBEA) was developed to overcome the limitations of DBEA. After testing DBEA and E-DBEA between two PCs connected through RS-232 cable, Modified-DBEA (M-DBEA) is developed gradually from E-DBEA which is then implemented at low level microcontroller. In order to extract the advantages of both DBEA and E-DBEA, Combined DBEA (C-DBEA), is developed and tested in real time between two PCs. The objective of this paper is to compare these Differential Coding based algorithms to determine the advantages and limitations of these algorithms. The paper also highlights the limiting range of DBEA, E-DBEA and C-DBEA in terms of the compression ratio (CR) achieved by the algorithms.