Eman M. Hammad

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This paper investigates the performance of the primary user in a multiuser cognitive radio environment. Using spectrum sharing method, multiple cognitive users compete to share a channel dedicated to the primary user in order to transmit their data to a common receiver unit. Only one cognitive user is scheduled to share the channel, and to do so, its(More)
A parametric controller is proposed for transient stability of synchronous generators after the occurrence of a disturbance in the power grid. The proposed controller based on feedback linearization control theory relies on receiving timely phasor measurement unit (PMU) information from selected parts of the power grid to employ fast acting flywheels that(More)
A parametric game-theoretic controller is proposed to stabilize power systems during and after cyber switching attacks. The attacks are based on calculated switchings of external power sources in order to destabilize the power system. The controller relies on receiving timely information from the cyber component of the smart grid to control the output of(More)
A cyber-enabled parametric control scheme is proposed for efficient transient frequency and phase stabilization in the power grid. Different implementations of the proposed control are investigated in this work. First, a centralized control scheme is proposed where the controller relies on timely phasor measurement unit (PMU) information about the grid to(More)
A parametric controller is proposed for the frequency and phase stabilization after the occurrence of a disturbance in the power grid. The proposed controller is based on the feedback linearization control theory. To drive the frequency of the system generators to stability, the controller relies on receiving timely phasor measurement unit (PMU) readings(More)
This article investigates the impact of choosing a specific quality of service constraint on the performance of the cognitive users in a spectrum sharing cognitive environment. To communicate over a wireless channel reserved to a primary user, the cognitive user has to satisfy the primary user’s quality of service constraint. Cognitive systems under(More)
This work investigates the performance of distributed control schemes in mitigating the effects of a switching attack in smart grid systems. The control schemes use feedback linearization to inject and absorb power in order to achieve transient stability. On the other hand, an adversary utilizes fast-acting energy storage systems in conducting a switching(More)
In this paper, we study a distributed control strategy that harnesses the highly granular data available in future power systems in order to improve system resilience to disturbances. Specifically, we investigate the role of external energy storage systems (ESSs) in stabilizing the dynamics of power systems during periods of disruption. We consider an(More)