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DigiPower Ltd.

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Strasser T.,AIT Austrian Institute of Technology | Andren F.,AIT Austrian Institute of Technology | Kathan J.,AIT Austrian Institute of Technology | Cecati C.,University of L'Aquila | And 12 more authors.
IEEE Transactions on Industrial Electronics | Year: 2015

Renewable energy sources are one key enabler to decrease greenhouse gas emissions and to cope with the anthropogenic climate change. Their intermittent behavior and limited storage capabilities present a new challenge to power system operators to maintain power quality and reliability. Additional technical complexity arises from the large number of small distributed generation units and their allocation within the power system. Market liberalization and changing regulatory framework lead to additional organizational complexity. As a result, the design and operation of the future electric energy system have to be redefined. Sophisticated information and communication architectures, automation concepts, and control approaches are necessary in order to manage the higher complexity of so-called smart grids. This paper provides an overview of the state of the art and recent developments enabling higher intelligence in future smart grids. The integration of renewable sources and storage systems into the power grids is analyzed. Energy management and demand response methods and important automation paradigms and domain standards are also reviewed. © 1982-2012 IEEE.

Cecati C.,University of L'Aquila | Cecati C.,DigiPower Ltd. | Kolbusz J.,Rzeszow University of Technology | Rozycki P.,Rzeszow University of Technology | And 2 more authors.
IEEE Transactions on Industrial Electronics | Year: 2015

Because of their excellent scheduling capabilities, artificial neural networks (ANNs) are becoming popular in short-term electric power system forecasting, which is essential for ensuring both efficient and reliable operations and full exploitation of electrical energy trading as well. For such a reason, this paper investigates the effectiveness of some of the newest designed algorithms in machine learning to train typical radial basis function (RBF) networks for 24-h electric load forecasting: support vector regression (SVR), extreme learning machines (ELMs), decay RBF neural networks (DRNNs), improves second order, and error correction, drawing some conclusions useful for practical implementations. © 2015 IEEE.

Cecati C.,University of L'Aquila | Cecati C.,DigiPower Ltd. | Ciancetta F.,University of Salerno | Siano P.,University of L'Aquila
IEEE Transactions on Industrial Electronics | Year: 2010

Converters for photovoltaic (PV) systems usually consist of two stages: a dc/dc booster and a pulsewidth modulated (PWM) inverter. This cascade of converters presents efficiency issues, interactions between its stages, and problems with the maximum power point tracking. Therefore, only part of the produced electrical energy is utilized. In this paper, the authors propose a single-phase H-bridge multilevel converter for PV systems governed by a new integrated fuzzy logic controller (FLC)/modulator. The novelties of the proposed system are the use of a fully FLC (not requiring any optimal PWM switching-angle generator and proportionalintegral controller) and the use of an H-bridge power-sharing algorithm. Most of the required signal processing is performed by a mixed-mode field-programmable gate array, resulting in a fully integrated System-on-Chip controller. The general architecture of the system and its main performance in a large spectrum of practical situations are presented and discussed. The proposed system offers improved performance over two-level inverters, particularly at lowmedium power. © 2010 IEEE.

Buccella C.,University of L'Aquila | Buccella C.,DigiPower Ltd. | Khalid H.A.,University of L'Aquila | Cecati C.,Harbin Institute of Technology | Xu D.,Harbin Institute of Technology
IECON 2015 - 41st Annual Conference of the IEEE Industrial Electronics Society | Year: 2015

In this paper, a grid connected shunt converter for mitigation of voltage sags in weak grids is described. The VSC keeps the grid voltage magnitude at the point of connection constant by injecting reactive power to compensate for the voltage dip. A novel flatness-based control (FBC) is proposed for this purpose that gives higher performance and robustness with an inductor/capacitor/inductor (LCL)-filter in between the VSC and the grid. Simulation model includes the practical limitation of voltage source converter output voltage. Then, the simulation results for the FBC under balanced voltage dips are presented and compared with traditional proportional integral controller. Finally, the sensitivity analysis of the FBC for grid impedance and to system parameter variations is presented. © 2015 IEEE.

Gungor V.C.,Bahcesehir University | Sahin D.,Bahcesehir University | Kocak T.,Bahcesehir University | Ergut S.,Turk Telekom Group RandD Division | And 5 more authors.
IEEE Transactions on Industrial Informatics | Year: 2011

For 100 years, there has been no change in the basic structure of the electrical power grid. Experiences have shown that the hierarchical, centrally controlled grid of the 20th Century is ill-suited to the needs of the 21st Century. To address the challenges of the existing power grid, the new concept of smart grid has emerged. The smart grid can be considered as a modern electric power grid infrastructure for enhanced efficiency and reliability through automated control, high-power converters, modern communications infrastructure, sensing and metering technologies, and modern energy management techniques based on the optimization of demand, energy and network availability, and so on. While current power systems are based on a solid information and communication infrastructure, the new smart grid needs a different and much more complex one, as its dimension is much larger. This paper addresses critical issues on smart grid technologies primarily in terms of information and communication technology (ICT) issues and opportunities. The main objective of this paper is to provide a contemporary look at the current state of the art in smart grid communications as well as to discuss the still-open research issues in this field. It is expected that this paper will provide a better understanding of the technologies, potential advantages and research challenges of the smart grid and provoke interest among the research community to further explore this promising research area. © 2011 IEEE.

Al-Emadi N.A.,Qatar University | Buccella C.,University of L'Aquila | Buccella C.,DigiPower Ltd. | Cecati C.,University of L'Aquila | And 3 more authors.
Electric Power Systems Research | Year: 2016

This paper proposes a five level cascaded converter for Distribution Static Compensator (DSTATCOM) implementing a novel modulation algorithm with harmonic mitigation and a PI controller with phase shift modulation for reactive power control. The modulator operates at fundamental frequency and the whole system satisfies grid code requirements using a simple passive output filter tuned with 11th harmonic. The behavior of the proposed system has been successfully compared with another one with multilevel space vector pulse width modulation. Results show its capability of ensuring satisfactory dynamic response at low frequency operations, resulting improved efficiency and reduced output filter requirements over more conventional systems. © 2015 Elsevier B.V. All rights reserved.

Buccella C.,University of L'Aquila | Buccella C.,DigiPower Ltd. | Cecati C.,University of L'Aquila | Cecati C.,DigiPower Ltd. | And 2 more authors.
IEEE Transactions on Industrial Informatics | Year: 2012

Power converters offer a high capability to efficiently manage electrical energy flows. Until a few years ago, their primary use was in supplying motors in industrial applications and in electric traction systems. Nowadays, in addition to those fields they are employed in a very wide range of low, medium, and high power applications including residential applications, renewable energy systems, distributed generation, and automotive. Since digital control represents a key element of modern power converters, this paper presents a review on digital devices [microcontrollers, Field Programmable Gate Arrays (FPGA)], hardware and software design techniques as well as implementation issues useful for designing modern high-performance power converters. © 2005-2012 IEEE.

Buccella C.,University of L'Aquila | Buccella C.,DigiPower Ltd. | Cecati C.,University of L'Aquila | Cecati C.,DigiPower Ltd. | And 3 more authors.
IEEE Transactions on Industrial Electronics | Year: 2014

This paper proposes an analytical procedure for computation of all pairs of valid switching angles used in pattern generation in five-level H-bridge cascaded inverters. The proposed procedure eliminates harmonic components from inverter output voltage and, for each harmonic, returns the exact boundaries of all valid modulation index intervals. Due to its simple mathematical formulation, it can be easily implemented in real time using a digital signal processor or a field-programmable gate array. In this paper, after a detailed description of the method, simulation and experimental results demonstrate the high quality of achievable results. © 1982-2012 IEEE.

Boscaino V.,University of Palerno | Miceli R.,University of Palerno | Buccella C.,DigiPower Ltd. | Cecati C.,DigiPower Ltd. | And 2 more authors.
2014 IEEE International Electric Vehicle Conference, IEVC 2014 | Year: 2014

Fuel Cells (FC) are widely investigated for their potential use in electric transportation due of their capability to provide significant amounts of energy with low-noise and with almost zero-emission. FC-based power sources are non-linear system with low voltage and high current capabilities and with efficiency close to 50%. Several researches are in progress, aiming at increasing overall efficiency through optimised combination of components, mainly the FC and the DC/DC converter necessary for its interface with the vehicle DC bus or the recharging station. In this paper, a novel and efficient power system architecture suitable for fuel cell powered vehicles and for recharging stations is proposed. The proposed system includes a fuel cell stack and a LLC resonant DC/DC converter with step-up capability. The latter due its to soft switching operations ensures enhanced efficiency over conventional hard switching counterpart. The proposed system has been modeled in a mixed PSIM-MATLAB/Simulink environment; design criteria and procedures are discussed for further applications and simulation results are shown to validate the proposed solution. © 2014 IEEE.

Barbati M.,University of L'Aquila | Caluisi C.,University of L'Aquila | Cecati C.,DigiPower Ltd.
IECON Proceedings (Industrial Electronics Conference) | Year: 2010

This paper presents a discrete implementation of a Triangular One Cycle Control for three phase active rectifiers. The algorithm is characterised by triangular modulation carrier and can be implementated using a programmable logic device, thus obtaining increased feasibility and performance over analog OCCs systems. Simulation results and comparisons with another three-phase active rectifier control method show that the proposed MT-OCC offers satisfactory performance in terms of high power factor control, low harmonic pollution, fast and accurate dc output voltage regulation and high stability during regenerative operations. © 2010 IEEE.

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