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156 results on '"Cecati C."'

2. A Simple Software-based Resolver To Digital Conversion System

Author

Di Tommaso A. O., Miceli R., Nevoloso C., Scaglione G., Schettino G., Buccella C., Cecati C., Di Tommaso A.O., Miceli R., Nevoloso C., Scaglione G., Schettino G., Buccella C., and Cecati C.

Subjects
Resolver to Digital Converter, Settore ING-IND/32 - Convertitori, Macchine E Azionamenti Elettrici, Resolver, speed measurement, Electric Drives
Abstract

In this paper, a software-based resolver to digital converter (RDC) is proposed. The hardware signal conditioning circuit is realized using common electronic components, while the algorithm can be implemented either using a microcontroller or an FPGA. Its validation and performance analysis has been carried out using an interior permanent magnet synchronous machine drive and, with comparative purposes, an LTN Servotechnik 1024 ppr incremental encoder. Tests show that the proposed RDC is characterized by a good dynamic response and precision, moreover, due to low computational demand, it can be successfully adopted without significant extra cost.

Published
2022
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3. Investigation about selective harmonic elimination in unbalanced multilevel inverters

Author

Buccella C., Cimoroni M. G., Cecati C., Di Tommaso A. O., Nevoloso C., Schettino G., Meo S., Buccella, C., Cimoroni, M. G., Cecati, C., Di Tommaso, A. O., Nevoloso, C., Schettino, G., Meo, S., Buccella C., Cimoroni M.G., Cecati C., Di Tommaso A.O., Nevoloso C., Schettino G., and Meo S.

Subjects
l-level Cascaded H-bridges (CHB) Inverters, Power Quality, Total Harmonic Distortion (THD), Selective Harmonic Elimination (SHE), l-level Cascaded H-bridges (CHB) Inverter
Abstract

In this paper 5 and 7 levels cascaded H-bridges inverters are considered, feeding by unequal dc voltage sources. The effect of these unbalancing operation is examined concerning harmonic analysis and total harmonic distortion of the output voltages. The system of equations, obtained by the expansion in the Fourier series of phase output voltage, is solved by applying a method of graphic solution that allows obtaining the switching angles able to eliminate the lower order harmonics.

Published
2022

7. Mathematical formulation of pulse amplitude modulation selective harmonic elimination in multilevel three phase inverters

Author

Buccella C., Cimoroni M. G., Cecati C., Di Tommaso A. O., Nevoloso C., Schettino G., Buccella C., Cimoroni M.G., Cecati C., Di Tommaso A.O., Nevoloso C., and Schettino G.

Subjects
Total Harmonic Distortion (THD), Selective Harmonics Elimination (SHE), Selective Harmonics Mitigation (SHM), Settore ING-IND/32 - Convertitori, Macchine E Azionamenti Elettrici, Cascaded H-bridges (CHB) Multilevel Inverters
Abstract

In this paper multilevel cascaded H-bridges (CHB) three phase inverters with 2n dc sources, n=1,2,3,... are considered and a mathematical formulation providing both 2n switching angles and dc voltage source to eliminate n+1 harmonics and their respective multiple from their output voltage waveform, is proposed. The computed angles don't depend on modulation index and the source voltages linearly vary with it. The proposed procedure finds the solution through an analytical formula that avoids to solve transcendental systems and presents very low computational cost. A lot of low order harmonics are eliminated, returning a very low total harmonic distortion (THD). Particularly for 9-level configuration, the first not mitigated harmonic is the 17th and the percentage THD is 5.59%.

Published
2022

8. Enhanced modulation strategy for 7-level voltage waveform in asymmetrical 5-level Cascaded H-Bridge Inverters

Author

Di Tommaso A. O., Miceli R., Nevoloso C., Scaglione G., Schettino G., Viola F., Buccella C., Cecati C., Cimoroni G., Di Tommaso A.O., Miceli R., Nevoloso C., Scaglione G., Schettino G., Viola F., Buccella C., Cecati C., and Cimoroni G.

Subjects
SHE or SHM algorithms, Dead time, THD, Settore ING-IND/32 - Convertitori, Macchine E Azionamenti Elettrici, Asymmetrical Cascaded H-Bridge Inverter, Modulation techniques
Abstract

The CHBMI performance optimization can be reached both with hardware and software solutions. Generally, asymmetrical configurations allow the extension of the voltage levels number and the implementation of an innovative modulation strategy allows for improving the performance in terms of harmonic distortion and conversion efficiency. This work is devoted to the development of a modulation strategy that allows improving the performance of an asymmetrical single-phase five-level Cascaded H-Bridge Inverter generating a 7-level voltage waveform. Thus, a digital approach and corresponding digital functions are presented. Subsequently, the impact of the dead time and the influence on the voltage harmonic distortion have been discussed. Through simulation analysis, in the Matlab environment, the main benefits and drawbacks of the proposed approach have been discussed.

Published
2022

36. Nonlinear Control of Three-Phase Inverter Systems Using the Derivative-Free Nonlinear Kalman Filter

Author

Rigatos, G., Siano, Pierluigi, Zervos, N., and Cecati, C.

Subjects
photovoltaics, three-phase voltage inverters, photovoltaics, HVDC lines, nonlinear feedback control, differential flatness theory, Derivative-free nonlinear Kalman Filter, HVDC lines, Derivative-free nonlinear Kalman Filter, nonlinear feedback control, three-phase voltage inverters, differential flatness theory
Published
2015

37. Communication requirements of wide area control in smart grids

Author

Cecati, C, Ibrahim, Y, Wilamowski, B M, Masoumiyan, Farzaneh, Mishra, Yateendra, Tian, Glen, Ledwich, Gerard, Cecati, C, Ibrahim, Y, Wilamowski, B M, Masoumiyan, Farzaneh, Mishra, Yateendra, Tian, Glen, and Ledwich, Gerard

Abstract

Wide Area Control is a new technology to maintain the power system stability; however, it requires the support of short-latency communication. The existing communication technology does not have the abilities to provide this support. It highlights the demand for new and short-latency communication technologies. The aim of this paper is to provide communication challenges of the wide area control system, to understand the communication requirements of the future energy system and to realize the existing network technologies that are applicable to energy management.

Published
2016

40. Renewable Energy Systems: Guest Editorial part II

Author

Liserre, M, Balcells, J, Basso, T, Bialasiewicz, J, Cecati, Carlo, Chakraborty, S, Guerriero, J, Kazerani, M, Kupzog, F, Nasiri, A, Palensky, P, Rodriguez, P, Sauter, T, TEODORESCU RLISERRE, M, Cecati, C, and Teodorescu, R.

Subjects
renewable energy systems
Published
2011

44. HFL micro inverter with front-end diode clamped multi-level inverter and half-wave cycloconverter

Author

Gao, H, Efe, O, Lai, Y S, Yin, S, Cecati, C, Nayanasiri, D.R., Vilathgamuwa, Mahinda, Maskell, D., Gao, H, Efe, O, Lai, Y S, Yin, S, Cecati, C, Nayanasiri, D.R., Vilathgamuwa, Mahinda, and Maskell, D.

Abstract

A high-frequency-link (HFL) micro inverter with a front-end diode clamped multi-level inverter and a grid-connected half-wave cycloconverter is proposed. The diode clamped multi-level inverter with an auxiliary capacitor is used to generate high-frequency (HF) three level quasi square-wave output and it is fed into a series resonant tank to obtain high frequency continuous sinusoidal current. The obtained continuous sinusoidal current is modulated by using the grid-connected half-wave cycloconverter to obtain grid synchronized output current in phase with the grid voltage. The phase shift power modulation is used with auxiliary capacitor at the front-end multi-level inverter to have soft-switching. The phase shift between the HFL resonant current and half-wave cycloconverter input voltage is modulated to obtain grid synchronized output current.

Published
2014

48. Semi-supervised intelligent surveillance system for secure environments

Author

Cecati, C, Blaabjerg, F, Fookes, Clinton, Denman, Simon, Lakemond, Ruan, Ryan, David, Sridharan, Sridha, Piccardi, Massimo, Cecati, C, Blaabjerg, F, Fookes, Clinton, Denman, Simon, Lakemond, Ruan, Ryan, David, Sridharan, Sridha, and Piccardi, Massimo

Abstract

This paper proposes a semi-supervised intelligent visual surveillance system to exploit the information from multi-camera networks for the monitoring of people and vehicles. Modules are proposed to perform critical surveillance tasks including: the management and calibration of cameras within a multi-camera network; tracking of objects across multiple views; recognition of people utilising biometrics and in particular soft-biometrics; the monitoring of crowds; and activity recognition. Recent advances in these computer vision modules and capability gaps in surveillance technology are also highlighted.

Published
2010

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