Ricerc@Sapienza

A sensorless speed tracking control for permanent magnet synchronous motors has been considered in this paper. In particular, a set of polynomial equations is derived from the output of the electrical subsystem in order to compute online the motor parameters and the initial angular position of the rotor. Then, a sliding mode-based control strategy, coupled with an observer using only electrical signals, guarantees the robust asymptotical tracking of a reference speed without measuring rotor velocity and position. The proposed approach has been experimentally tested on an embedded board.

This letter addresses the problem of robust
output regulation of systems described by linear
differential-algebraic equations (DAEs). Taking advantage
of some recent relevant results concerned with the
development of normal forms for general DAEs, it is shown
how an internal model can be designed in such a way
that the problem in question is reduced to the problem
of robustly stabilizing an augmented system modeled by
DAEs. Then, a suitable enhancement—within the context
of systems modeled by DAEs—of the theory of extended

This paper presents a robust protection scheme to protect the power transmission network against a class of feedback-based attacks referred in the literature as "Dynamic Load Altering Attacks" (D-LAAs). The proposed scheme envisages the usage of Energy Storage Systems (ESSs) to avoid the destabilising effects that a malicious state feedback has on the power network generators. The methodologies utilised are based on results from polytopic uncertain systems, invariance theory and Lyapunov arguments. Numerical simulations on a test scenario validate the proposed approach.