Hybrid Huffman coding scheme for efficient and secured condition monitoring of a substation

Abstract

This paper aims to monitor a substation from a centralized control station based on the data related to different buses and their secured and efficient communication. The data of the buses in a substation may primarily consist of the bus number, magnitudes of voltage, current, delta angle etc. In order to ensure data security while sending the bus information to a centralized monitoring station, the authors have proposed a hybrid data compression technique where Differential Pulse Code Modulation (DPCM) is first applied on the original data followed by Huffman coding. This results in efficient monitoring of a substation. Moreover, the data compression ratio is also found to be well within the limit. This has further enhanced the data security as well.