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196 results on '"Caldognetto, Tommaso"'

51. Modeling and simulation of smart buildings energy resources for energy management systems studies

Author

Universitat Politècnica de Catalunya. Departament d'Organització d'Empreses, Università degli Studi di Padova, Caldognetto, Tommaso, Roig García, Luis, Universitat Politècnica de Catalunya. Departament d'Organització d'Empreses, Università degli Studi di Padova, Caldognetto, Tommaso, and Roig García, Luis

Abstract

As the electrical energy production model is evolving from the traditional large capacity electrical power plants into distributed energy resources (DERs) that form smart grids and smart microgrids, having the capability to simulate innovative DER energy management techniques can eventually lead to obtaining revolutionary solutions that establish the foundations of a more efficient production model. In this master thesis, a local small-scale grid with DERs is modeled and analyzed in simulation, highlighting its potentials and exploring energy management and sizing approaches. Specifically, an energy management system (EMS) is modeled in order to analyze the behavior of the DER system under different control criteria, considering both fast transients and longer dynamics., Outgoing

Published
2019

52. A Master/Slave Approach to Power Flow and Overvoltage Control in Low-Voltage Microgrids

Author

Electrical and Computer Engineering, Cavraro, Guido, Caldognetto, Tommaso, Carli, Ruggero, Tenti, Paolo, Electrical and Computer Engineering, Cavraro, Guido, Caldognetto, Tommaso, Carli, Ruggero, and Tenti, Paolo

Abstract

This paper proposes a technique to control distributed energy resources in low-voltage microgrids aiming at (i) allowing power flow control at the point of connection with the upstream grid, (ii) keeping voltage profiles within the operational limits. The first feature is crucial in smart low-voltage power systems. In fact, it enables both demand-responses, which is extremely valuable from the point of view of distribution system operators and for energy trading, and the autonomous operation of the microgrid. The latter can be achieved by regulating to zero the power exchanged with the main grid. The second feature allows to limit voltage increases due to active power injection by distributed energy resources and, thus, to limit stresses on the electrical infrastructure and the served loads, which is a concrete issue as renewables become widely deployed in the low-voltage scenario. The proposed approach is firstly described in detail, then a systematic analysis of its local and global properties is reported. All the obtained results are verified considering the IEEE 37 test feeder in realistic operating conditions.

Published
2019

53. Seamless Mode Transitions for Triple-Loop Controlled Interlinking Converters

Author

Liu, Qing, Caldognctto, Tommaso, Buso, Simone, and Caldognetto, Tommaso

Subjects
Control and Optimization, Computer science, Energy Engineering and Power Technology, Converters, Grid, Harmonic analysis, Modeling and Simulation, Electrical and Electronic Engineering, Robustness (computer science), Harmonics, Voltage spike, Electronic engineering, Inverter, Electrical impedance
Abstract

Interlinking converters interface microgrids with the ac main grid and are expected to operate both grid-connected and islanded. The capability of transition between the two modes of operation is therefore an important functionality. However, significant current and voltage spikes can easily occur across the transitions, which makes the mode transition control a challenging task. A flexible feed-forward solution is proposed herein to achieve seamless operation modes transitions, by exploiting an underlying large-bandwidth triple-loop controller for interlinking converters. Thanks to the advantages brought by the triple-loop controller and the flexible feed-forward strategy, the proposed solution achieves i) in grid-tied operation, robustness against various types of grid anomalies (e.g., amplitude or frequency variations, grid voltage harmonics), ii) in islanded operation, continuous, high-quality supply of the local loads, iii) smooth transitions between the two operation modes. These features are verified experimentally on a 3kVA single-phase inverter.

Published
2018

81. Control of Electronic Power Converters for Low-Voltage Microgrids

Author

Caldognetto, Tommaso and Caldognetto, Tommaso

Abstract

The dissertation focuses on the management of master/slave microgrid architectures, where distributed energy resources (DERs) are interfaced to the grid by means of conventional current-driven power electronics interfaces and the microgrid is interfaced to the mains via a voltage-driven utility interface converter. The so called power-based control is proposed to regulate the contribution to microgrid needs from the energy resources that are available. The control approach ensures an accurate active and reactive power sharing among DERs that takes into account both local (i.e., DER level) and global (i.e., microgrid level) constraints. The described general approach to microgrid control is underpinned by the conservative power theory, which offers a meaningful, robust, and computationally efficient method to manage power quantities referring to different grid nodes.

Published
2016

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