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GIAMPAOLO BUTICCHI
Docente a contratto Dipartimento di Ingegneria "Enzo Ferrari"
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Pubblicazioni
2023
- Active Thermal Control for Lifetime Equalization in CSI7-based Modular Photovoltaic Integration System
[Relazione in Atti di Convegno]
Peng, Q.; Buticchi, G.; Migliazza, G.; Tan, N. M. L.; Guenter, S.; Carfagna, E.; Fidone, G. L.
abstract
2023
- Common Architectures and Devices for Current Source Inverter in Motor-Drive Applications: A Comprehensive Review
[Articolo su rivista]
Fidone, G. L.; Migliazza, G.; Carfagna, E.; Benatti, D.; Immovilli, F.; Buticchi, G.; Lorenzani, E.
abstract
When compared to the much more common voltage-source inverter (VSI), the current-source inverter (CSI) is rarely used for variable speed drive applications, due to its disadvantages: the need of a constant DC-link current, typically realized with a front-end converter, and the need for reverse-voltage blocking (RVB) devices, typically implemented with in-series diodes. This limits the overall efficiency of the architecture. This paper investigates latest progress of the CSI research, with the aim of demonstrating why CSI could come back in the near future. Different architectures based on modern wide-bandgap (WBG) switches are analyzed, with an emphasis on why CSI can be advantageous compared to VSI.
2023
- Improved Speed Extension for Permanent Magnet Synchronous Generators by Means of Winding Reconfiguration
[Articolo su rivista]
Zhou, X.; Yang, J.; Migliazza, G.; Guenter, S.; Wang, S.; Gerada, C.; Buticchi, G.
abstract
With the increased development of electrical subsystems onboard modern transportation platforms, e.g., more electric aircrafts or more electric ships, the need for electric generation systems has increased. Since many motors require electric starting capability, the application of the starter/generator has been the focus of several studies. The peculiarity of such a system is its requirement for high torque at low speed (for the starting) as well as an extended operation range during the normal generation operations. This mismatch between maximum torque and speed comes at the expense of the power density of the electronic converter, which needs to be designed for the worst case situation and, due to the electric machine optimization, often requires field weakening operations. A new winding reconfiguration is proposed to achieve speed extension and provide more potentiality for high-speed applications. This work compares different power trains in terms of efficiency current stress for electric machines. Hardware-in-the-loop results are adopted to verify the practical implementation of the control systems.
2023
- Numerical Robustness Evaluation of Floating-Point Closed-Loop Control Based on Interval Analysis
[Articolo su rivista]
Savi, F; Farjudian, A; Buticchi, G; Barater, D; Franceschini, G
abstract
Power-electronics-based systems have penetrated into several critical sectors, such as the industry, power generation, energy transmission and distribution, and transportation. In this context, the system's control, often implemented in real-time processing units, has to meet stringent requirements in terms of safety and repeatability. Given the growing complexity of the implemented algorithms, floating-point arithmetic is being increasingly adopted for high-performance systems. This paper proposes to assess the numerical stability of the control algorithms by means of an interval analysis. The case study of an electric drive is considered, given the wide adoption of such systems and the importance they hold for the safety of the applications. In particular, two different control strategies-the resonant control and the vector space decomposition-are examined, and a sensitivity analysis based on the proposed technique highlights the different characteristics of the two with respect to numerical stability. The proposed method shows how the resonant control is more robust to variations of the controller gain coefficients with respect to the numerical stability, which could make it the preferred choice for mission-critical electric drive control.
2023
- Work in Progress: Output Impedance Specification of A Three-Phase Current-Source Inverter for Modular Photovoltaic Applications
[Relazione in Atti di Convegno]
Peng, Q.; Migliazza, G.; Buticchi, G.; Guenter, S.; Tan, N. M. L.; Yang, J.; Wheeler, P.
abstract
Impedance-based stability assessment has been an important part of renewable integration. Modeling and measurement of impedance under Synchronized Reference Frame (SRF) is a common way for a portrait of the frequency-dependent impedance. In this paper, a modified current-source inverter (CSI) called CSI7 for photovoltaic (PV) integration is studied. The SRF admittance of the system under different solar irradiation from 400W/m2 to 1000W/m2 with a resolution of 100W/m2 is measured in PLECS simulation. It is found that large frequency-dependent admittance appears under the high-frequency zone of the q axis which could lead to harmonic instability problems.
2022
- FemtoCore enabled quasi-distributed Control for Modular Multilevel Converters
[Relazione in Atti di Convegno]
Savi, F.; Barater, D.; Franceschini, G.; Buticchi, G.
abstract
The development of the processing capability has enabled the implementation of advanced control systems for power electronics converters. In this framework, the modular multilevel converter has attracted the attention of industry and academia, thanks to the good performance in terms of power quality, wide voltage capability, and fault tolerance, which are key requirement for high power applications. This paper proposes a quasi distribute control architecture based on a FemtoCore platform, an optimized soft-core designed for modular power electronics applications. Latency estimates and simulation results shows the potential of this solution for the control of modular multilevel converters.
2022
- femtoCore: An Open Source Processor Architecture for Power Electronics Controls
[Relazione in Atti di Convegno]
Savi, F.; Barater, D.; Franceschini, G.; Buticchi, G.
abstract
2021
- A Scalable System Architecture for High-Performance Fault Tolerant Machine Drives
[Articolo su rivista]
Savi, F.; Barater, D.; Buticchi, G.; Gerada, C.; Wheeler, P.
abstract
When targeting mission critical applications, the design of the electronic actuation systems needs to consider many requirements and constraints not typical in standard industrial applications. One of these is tolerance to faults, as the unplanned shutdown of a critical subsystem, if not handled correctly, could lead to financial harm, environmental disaster, or even loss of life. One way this can be avoided is through the design of an electric drive systems based on multi-phase machines that can keep operating, albeit with degraded performance, in a partial configuration under fault conditions. Distributed architectures are uniquely suited to meet these challenges, by providing a large degree of isolation between the various components. This paper presents a system architecture suitable for scalable and high-performance fault tolerant machine drive systems. the effectiveness of this system is demonstrated through theoretical analysis and experimental verification on a six-phase machine.
2021
- Modelling of Voltage Distribution within Hairpin Windings
[Relazione in Atti di Convegno]
Preci, E.; Nuzzo, S.; Barater, D.; Gerada, D.; Degano, M.; Buticchi, G.; Gerada, C.
abstract
This work discusses the modelling approach adopted for the estimation of the voltage distribution within hairpin windings of electrical machines. The physical phenomena and the major contributors to the occurrence of the uneven voltage distribution are first described. Then, the equivalent circuit used to predict the voltage distribution is presented in detail. The circuital parameters employed in the equivalent circuit are estimated via finite element electrostatic and electromagnetic analyses. Finally, a numerical tool is used to solve the differential equations describing the equivalent circuit above mentioned. Simulation results are illustrated and discussed. The phenomena under investigation are applied to a pre-defined reference system, consisting of slot motorettes.
2012
- A Nine-Level Grid-Connected Photovoltaic Inverter Based on Cascaded Full-Bridge with Flying Capacitor
[Relazione in Atti di Convegno]
Buticchi, G.; Concari, C.; Franceschini, G.; Lorenzani, E.; Zanchetta, P.
abstract
This paper proposes a nine-level PWM gridconnected
photovoltaic inverter for single-phase applications.
The basic structure relies on two cascaded full-bridges supplied
with different voltage levels. A flying capacitor provides the
power supply for the lower voltage full-bridge. In order to
increase the efficiency and keep the ground leakage current
under control, a specific PWM strategy was developed and
an additional leakage current reduction circuit was added to
the basic structure of the cascaded full-bridge. Moreover, the
regulation of the flying capacitor voltage is taken into account.
Simulations and experimental results confirm the good performance of the proposed solution.