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90 results on '"Paschero, Maurizio"'

3. A novel mechanical analogy based battery model for SoC estimation using a multi-cell EKF

Author

Paschero, Maurizio, Storti, Gian Luca, Rizzi, Antonello, Mascioli, Fabio Massimo Frattale, and Rizzoni, Giorgio

Subjects
Computer Science - Systems and Control
Abstract

The future evolution of technological systems dedicated to improve energy efficiency will strongly depend on effective and reliable Energy Storage Systems, as key components for Smart Grids, microgrids and electric mobility. Besides possible improvements in chemical materials and cells design, the Battery Management System is the most important electronic device that improves the reliability of a battery pack. In fact, a precise State of Charge (SoC) estimation allows the energy flows controller to exploit better the full capacity of each cell. In this paper, we propose an alternative definition for the SoC, explaining the rationales by a mechanical analogy. We introduce a novel cell model, conceived as a series of three electric dipoles, together with a procedure for parameters estimation relying only on voltage measures and a given current profile. The three dipoles represent the quasi-stationary, the dynamics and the istantaneous components of voltage measures. An Extended Kalman Filer (EKF) is adopted as a nonlinear state estimator. Moreover, we propose a multi-cell EKF system based on a round-robin approach to allow the same processing block to keep track of many cells at the same time. Performance tests with a prototype battery pack composed by 18 A123 cells connected in series show encouraging results., Comment: 8 page, 12 figures, 1 table

Published
2016
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4. On the impact of topological properties of smart grids in power losses optimization problems

Author

Possemato, Francesca, Paschero, Maurizio, Livi, Lorenzo, Rizzi, Antonello, and Sadeghian, Alireza

Subjects
Computer Science - Computational Engineering, Finance, and Science, Computer Science - Neural and Evolutionary Computing
Abstract

Power losses reduction is one of the main targets for any electrical energy distribution company. In this paper, we face the problem of joint optimization of both topology and network parameters in a real smart grid. We consider a portion of the Italian electric distribution network managed by the ACEA Distribuzione S.p.A. located in Rome. We perform both the power factor correction (PFC) for tuning the generators and the distributed feeder reconfiguration (DFR) to set the state of the breakers. This joint optimization problem is faced considering a suitable objective function and by adopting genetic algorithms as global optimization strategy. We analyze admissible network configurations, showing that some of these violate constraints on current and voltage at branches and nodes. Such violations depend only on pure topological properties of the configurations. We perform tests by feeding the simulation environment with real data concerning hourly samples of dissipated and generated active and reactive power values of the ACEA smart grid. Results show that removing the configurations violating the electrical constraints from the solution space leads to interesting improvements in terms of power loss reduction. To conclude, we provide also an electrical interpretation of the phenomenon using graph-based pattern analysis techniques., Comment: 35 pages, 38 references

Published
2015
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14. Improvement of axial load capacity of elliptical cylindrical shells

Author

Paschero, Maurizio and Hyer, Michael W.

Subjects
Cylinders -- Mechanical properties, Cylinders -- Design and construction, Finite element method -- Usage, Aerospace and defense industries, Business
Abstract

By varying the thickness of the cylinder wall with circumferential position, the axial buckling capacities of homogeneous, isotropic cylindrical shells with elliptical cross sections are improved. The classic buckling stress relation for a uniform-thickness homogeneous, isotropic circular cylindrical shell is applied to cylinders with elliptical cross sections. It is assumed that this relation can be used to design the wall thicknesses of elliptical cylinders as a function of circumferential location to compensate for the negative effects of the variation of the radius of curvature with circumferential location. Three variable-thickness elliptical cylinder designs are proposed, and analytical expressions for the thickness variation, cross-sectional area, axial buckling stress, axial buckling stress resultant, and axial buckling load for each design are derived. Predictions from the analytical development are then compared with finite element analyses of the three designs. So-called small and large cylinders with three values of eccentricity are considered. The comparisons between the finite element results and the analytic predictions are quite good. It is shown that considerable improvement in axial buckling capacity can be achieved with the thickness-tailoring technique, and in some cases the axial capacity of the circular cylinder with the same circumference is achieved. DOI: 10.2514/1.37012

Published
2009

20. IL PROGETTO 'LIFE FOR SILVER COAST'

Author

FRATTALE MASCIOLI, Fabio Massimo, Rizzi, Antonello, Paschero, Maurizio, Joime, GIAN PIERO, London, Marco, and LO RE, Giulio

Published
2017

21. IL PROGETTO 'HI-ZEV'

Author

Rizzi, Antonello, FRATTALE MASCIOLI, Fabio Massimo, Paschero, Maurizio, and Anniballi, Luigi

Published
2017

26. ALGORITMI DI INTELLIGENZA COMPUTAZIONALE PER LA MOBILITA’ SOSTENIBILE E L’EFFICIENZA ENERGETICA

Author

Rizzi, Antonello, Luzi, Massimiliano, Paschero, Maurizio, and FRATTALE MASCIOLI, Fabio Massimo

Subjects
Particle Swarm Optimization, Energy Storage Systems, Battery Management System, Microcontrollori, Stima dello stato di carica, Kalman Filter, Hardware in the Loop, Particle Swarm Optimization, Stima dello stato di carica, Hardware in the Loop, Microcontrollori, Battery Management System, Energy Storage Systems, Kalman Filter
Published
2016

33. IL PROGETTO BONIFICA 2.0

Author

FRATTALE MASCIOLI, Fabio Massimo, Rizzi, Antonello, Paschero, Maurizio, Anniballi, L., Storti, Gianluca, Lisena, Valentina, Gentile, Valeria, London, Marco, Fabbri, G., Nardecchia, S., and Dessì, M.

Subjects
Micro Grids, Veicoli ZEV, Sistema territoriale integrato, Mobilità Sostenibile, Ricarica veloce in DC, Smart Grids
Published
2014

40. Improvement of the axial buckling capability of elliptical cylindrical shells

Author

Paschero, Maurizio, Engineering Science and Mechanics, Hyer, Michael W., Batra, Romesh C., Beex, A. A. Louis, Patil, Mayuresh J., and Thangjitham, Surot

Subjects
Material tailoring, Variable thickness cylinders, Stability, Elliptical cylinders, Anisogrid cylinders
Abstract

A rather thorough and novel buckling analysis of an axially-loaded orthotropic circular cylindrical shell is formulated. The analysis assumes prebuckling rotations are negligible and uses a unique re-defining of the orthotropic material properties in terms of a so-called geometric mean isotropic (GMI) material. Closed-form expressions for the buckling stress in terms of cylinder geometry and orthotropic material properties are presented, the particular closed form depending on the specific character of the orthotropic material relative to the GMI material. With the formulation, the specific character of the buckling deformations - e.g., axisymmetric or nonaxisymmetric, the number of axial and circumferential waves - can be established. By using the maximum radius of curvature of an elliptical cross section in this formulation, the analysis is used to demonstrate the detrimental effects of an elliptical cross section on axial buckling capacity when compared to a circular cross section with the same circumference. Using the circumferentially-varying radius of curvature of an elliptical cross section, the analysis is then further used as the basis for developing two methods for improving the axial buckling capacity of elliptical cylinders. The first approach involves varying the wall thickness of an isotropic elliptical cylinder with circumferential position. Uniformly stable elliptical cross sections which preserve the same critical stress, critical load, or volume of an axially loaded circular cylinder of the same circumference are designed with the formulation. The second approach involves maintaining a uniform wall thickness but varying the orthotropic material properties with circumferential position. This approach is applied to a cylindrical lattice structure where it is assumed that the ribs are dense enough to be able to describe the lattice structure by means of an equivalent homogenized material. The orthotropic properties of the homogenized material are varied by varying the lattice rib angle with circumferential position. Considerable recovery of the axial buckling capacity of the variable-rib-angle design elliptical cylinder compared to the same cylinder constructed in isogrid fashion is demonstrated. In fact, recovery relative to an isogrid circular cylinder of the same circumference is demonstrated. For both approaches confirming finite element models are used to verify the findings. The two different approaches are compared, and finally the two approaches are recognized as special cases of a more general design philosophy. Ph. D.

Published
2008

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