State estimation through secure wireless communication in a smart grid

Abstract

Secure system state estimation and anti-jamming transmission is a critical issue in smart grid to assure reliability and stability. The smart grid is modeled as a linear dynamic system. This paper consider an observer station, an eavesdropper listening in presence of Gaussian noise communication channel and a control Centre. In smart grid model, the problem of how to evaluate information rate (bit/sec) and system state of the linear dynamic system as well as securely transmit to destination through wireless link is studied. The capacity requirement is evaluated by numerical simulation in typical configuration of smart grid. The open nature of the wireless network has raised issues of confidentiality and security of transmitted information. Various attacks such as eavesdropping, information tampering, and malicious control command injection would impose serious threat on secure and stable smart grids operation in wireless channel. Spread spectrum (SS) techniques is an important ingredient that prevent such threats of attack in wireless communication as well as achieve the privacy of dynamic system state information during transmission.The project focus on securely recovery of system state at control center in case of single and multiple observer system using DSSS (direct sequence spread spectrum) in simplified smart grid dynamic model through MATLAB simulation.