Christian Conficoni

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Supercomputers machines, HPC systems in general, embed sophisticated and advanced cooling circuits to remove heat and ensuring the required peak performance. Unfortunately removing heat, by means of cold water or air, costs additional power which decreases the overall supercomputer energy efficiency. Free-cooling uses ambient air instead than chiller to(More)
Hot-water liquid cooling is a key technology in future green supercomputers as it maximizes the cooling efficiency and energy reuse. However the cooling system still is responsible for a significant percentage of modern HPC power consumption. Standard design of liquid-cooling control relies on rules based on worst-case scenarios, or on CFD simulation of(More)
An original full-order observer is presented for stator fluxes and speed reconstruction for Permanent Magnet Synchronous Machines. The estimation is carried out in a fixed reference frame exploiting the stator currents and voltages as the only known variables. Global asymptotic convergence properties of the proposed scheme are drawn, casting the estimation(More)
A novel and simple observer scheme is proposed for rotor speed and position reconstruction for Permanent Magnet Synchronous Machines. The reference frame adopted in the observer is pushed toward the synchronous one by forcing it to be intrinsically aligned with the estimated back-emf vector and by designing suitable adaptations law for its speed and angle(More)
In this chapter some results related to Shunt Active Filters (SAFs) and obtained by the authors and some coauthors are reported. SAFs are complex power electronics equipments adopted to compensate for current harmonic pollution in electric mains, due to nonlinear loads. By using a proper "floating" capacitor as energy reservoir, the SAF purpose is to inject(More)
A novel observer is proposed to reconstruct rotor speed and rotor flux vector in induction motors. The presented solution is characterized by a simple structure, based on a rotating reference frame which is pushed toward perfect alignment with the time-derivative of the rotor flux vector with respect to the stator windings reference frame. This approach(More)