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Dr. Michele De Santis
Università degli Studi Niccolò Cusano

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Research Keywords & Expertise

0 wireless power transfer (WPT)
0 voltage sags
0 Distributed generation and renewable energies
0 Power system analysis and optimization
0 Electric vehicles & e-mobility

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voltage sags

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Journal article
Published: 26 July 2021 in Electronics
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This paper introduces a new ellipsoidal-based tracker design to control a grid-connected hybrid direct current/alternating current (DC/AC) microgrid (MG). The proposed controller is robust against both parameters and load variations. The studied hybrid MG is modelled as a nonlinear dynamical system. A linearized model around an operating point is developed. The parameter changes are modelled as norm-bounded uncertainties. We apply the new extended version of the attractive (or invariant) ellipsoid for this tracking problem. Convex optimization is used to obtain the region’s minimal size where the tracking error between the state trajectories and the reference states converges. The sufficient conditions for stability are derived and solved based on linear matrix inequalities (LMIs). The proposed controller’s validity is shown via simulating the hybrid MG with various operational scenarios. In each scenario, the performance of the controller is compared with a recently proposed sliding mode controller. The comparison clearly illustrates the superiority of the developed controller in terms of transient and steady-state responses.

ACS Style

Hilmy Awad; Ehab Bayoumi; Hisham Soliman; Michele De Santis. Robust Tracker of Hybrid Microgrids by the Invariant-Ellipsoid Set. Electronics 2021, 10, 1794 .

AMA Style

Hilmy Awad, Ehab Bayoumi, Hisham Soliman, Michele De Santis. Robust Tracker of Hybrid Microgrids by the Invariant-Ellipsoid Set. Electronics. 2021; 10 (15):1794.

Chicago/Turabian Style

Hilmy Awad; Ehab Bayoumi; Hisham Soliman; Michele De Santis. 2021. "Robust Tracker of Hybrid Microgrids by the Invariant-Ellipsoid Set." Electronics 10, no. 15: 1794.

Journal article
Published: 15 May 2021 in Applied Sciences
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This paper addresses the problem of optimizing the voltage profile of radially-operated distribution systems by acting on the active and reactive powers provided by distributed energy resources (DERs). A novel voltage optimization procedure is proposed by adopting a decentralized control strategy. To this aim, a centralized voltage optimization problem (VOP), minimizing the distance of all the nodal voltages from their reference values, is firstly formulated as a strictly-convex quadratic program. Then, the centralized VOP is rewritten by partitioning the network into voltage control zones (VCZs) with pilot nodes. To overcome the lack of strictly convexity determined by the reduction to the pilot nodes, the dual centralized VOP working on the augmented Lagrangian function is reformulated and iteratively solved by the method of multipliers. Finally, a fully-distributed VOP solution is obtained by applying a distributed algorithm based on the auxiliary problem principle, which allows for solving in each VCZ a quadratic programming problem of small dimension and to drive the VCZ solutions toward the overall optimum by an iterative coordination process that requires to exchange among the VCZs only scalar values. The effectiveness and feasibility of the proposed method have been demonstrated via numerical tests on the IEEE 123-bus system.

ACS Style

Anna Di Fazio; Chiara Risi; Mario Russo; Michele De Santis. Decentralized Voltage Optimization Based on the Auxiliary Problem Principle in Distribution Networks with DERs. Applied Sciences 2021, 11, 4509 .

AMA Style

Anna Di Fazio, Chiara Risi, Mario Russo, Michele De Santis. Decentralized Voltage Optimization Based on the Auxiliary Problem Principle in Distribution Networks with DERs. Applied Sciences. 2021; 11 (10):4509.

Chicago/Turabian Style

Anna Di Fazio; Chiara Risi; Mario Russo; Michele De Santis. 2021. "Decentralized Voltage Optimization Based on the Auxiliary Problem Principle in Distribution Networks with DERs." Applied Sciences 11, no. 10: 4509.

Journal article
Published: 29 April 2021 in Energies
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Voltage control is becoming a key issue in active distribution systems, which are electric distribution networks characterized by a large penetration of DERs. Traditional voltage control devices, as well as the active and reactive powers injected by DERs, can be used as ancillary services to support voltage profiles along the distribution feeders. Due to the peculiar characteristics of active distribution systems, the decentralized control approach presents the most promising technical and economical features. In the paper, the decentralized voltage control structure is hierarchically decomposed into different control levels, characterized by different objectives and time frames. The primary and secondary control levels have been analyzed, always according to a decentralized approach. For each level, the various techniques for solving the voltage control problem that have been proposed in the literature are presented, and their main features compared. The main open issues related to the real time practical implementation of the decentralized architectures at both primary and secondary voltage control levels are investigated, keeping always in mind both technical and economical aspects, which always represent the components of a trade-off solution.

ACS Style

Giuseppe Fusco; Mario Russo; Michele De Santis. Decentralized Voltage Control in Active Distribution Systems: Features and Open Issues. Energies 2021, 14, 2563 .

AMA Style

Giuseppe Fusco, Mario Russo, Michele De Santis. Decentralized Voltage Control in Active Distribution Systems: Features and Open Issues. Energies. 2021; 14 (9):2563.

Chicago/Turabian Style

Giuseppe Fusco; Mario Russo; Michele De Santis. 2021. "Decentralized Voltage Control in Active Distribution Systems: Features and Open Issues." Energies 14, no. 9: 2563.

Journal article
Published: 29 March 2021 in Applied Sciences
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Most industrial trucks are equipped with hydraulic systems designed for specific operations, for which the required power is supplied by the internal combustion engine (ICE). The largest share of the power consumption is required by the hydraulic system during idling operations, and, consequently, the current literature focuses on energy saving strategies for the hydraulic system rather than making the vehicle traction more efficient. This study presents the preliminary realization of an electric-powered hydraulic pump system (e-HPS) that drives the lifting of the dumpster and the garbage compaction in a waste compactor truck, rather than traditional ICE-driven hydraulic pump systems (ICE-HPSs). The different components of the e-HPS are described and the battery pack was modelled using the kinetic battery model. The end-of-life of the battery pack was determined to assess the economic feasibility of the proposed e-HPS for the truck lifespan, using numerical simulations. The aim was twofold: to provide an implementation method to retrofit the e-HPS to a conventional waste compactor truck and to assess its economic feasibility, investigating fuel savings during the use phase and the consequent reduction of CO2 emissions. Results show that the total lifespan cost saving achieved a value of 65,000 €. Furthermore, total CO2 emissions for the e-HPS were about 80% lower than those of the ICE-HPS, highlighting that the e-HPS can provide significant environmental benefits in an urban context.

ACS Style

Michele De Santis; Luca Silvestri; Antonio Forcina; Gianpaolo Di Bona; Anna Di Fazio. Preliminary Realization of an Electric-Powered Hydraulic Pump System for a Waste Compactor Truck and a Techno-Economic Analysis. Applied Sciences 2021, 11, 3033 .

AMA Style

Michele De Santis, Luca Silvestri, Antonio Forcina, Gianpaolo Di Bona, Anna Di Fazio. Preliminary Realization of an Electric-Powered Hydraulic Pump System for a Waste Compactor Truck and a Techno-Economic Analysis. Applied Sciences. 2021; 11 (7):3033.

Chicago/Turabian Style

Michele De Santis; Luca Silvestri; Antonio Forcina; Gianpaolo Di Bona; Anna Di Fazio. 2021. "Preliminary Realization of an Electric-Powered Hydraulic Pump System for a Waste Compactor Truck and a Techno-Economic Analysis." Applied Sciences 11, no. 7: 3033.

Journal article
Published: 25 February 2021 in Energies
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This paper presents the preliminary results of our research activity aimed at forecasting the number of voltage sags in distribution networks. The final goal of the research is to develop proper algorithms that the network operators could use to forecast how many voltage sags will occur at a given site. The availability of four years of measurements at Italian Medium Voltage (MV) networks allowed the statistical analyses of the sample voltage sags without performing model-based simulations of the electric systems in short-circuit conditions. The challenge we faced was to overcome the barrier of the extremely long measurement times that are considered mandatory to obtain a forecast with adequate confidence. The method we have presented uses the random variable time to next event to characterize the statistics of the voltage sags instead of the variable number of sags, which usually is expressed on an annual basis. The choice of this variable allows the use of a large data set, even if only a few years of measurements are available. The statistical characterization of the measured voltage sags by the variable time to next event requires preliminary data-conditioning steps, since the voltage sags that are measured can be divided in two main categories, i.e., rare voltage sags and clusters of voltage sags. Only the rare voltage sags meet the conditions of a Poisson process, and they can be used to forecast the performance that can be expected in the future. However, the clusters do not have the characteristics of memoryless events because they are sequential, time-dependent phenomena the occurrences of which are due to exogenic factors, such as rain, lightning strikes, wind, and other adverse weather conditions. In this paper, we show that filtering the clusters out from all the measured sags is crucial for making successful forecast. In addition, we show that a filter, equal for all of the nodes of the system, represents the origin of the most important critical aspects in the successive steps of the forecasting method. In the paper, we also provide a means of tracking the main problems that are encountered. The initial results encouraged the future development of new efficient techniques of filtering on a site-by-site basis to eliminate the clusters.

ACS Style

Michele De Santis; Leonardo Di Stasio; Christian Noce; Paola Verde; Pietro Varilone. Initial Results of an Extensive, Long-Term Study of the Forecasting of Voltage Sags. Energies 2021, 14, 1264 .

AMA Style

Michele De Santis, Leonardo Di Stasio, Christian Noce, Paola Verde, Pietro Varilone. Initial Results of an Extensive, Long-Term Study of the Forecasting of Voltage Sags. Energies. 2021; 14 (5):1264.

Chicago/Turabian Style

Michele De Santis; Leonardo Di Stasio; Christian Noce; Paola Verde; Pietro Varilone. 2021. "Initial Results of an Extensive, Long-Term Study of the Forecasting of Voltage Sags." Energies 14, no. 5: 1264.

Accepted manuscript
Published: 26 February 2020 in Nanotechnology
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In in vivo postsurgery monitoring, the use of wireless biodegradable implantable sensors has gained and is gaining a lot of interest, particularly in the case of monitoring for a short period of time. Indeed, the employment of biodegradable materials would allow to circumvent a secondary surgery for the devices removal. Additionally, the use of wireless communication for the data elaboration would consent to avoid the need of transcutaneous wires. In this manner it would be possible to prevent possible inflammation and infections associated with long-term and not wireless implants. It is expected that microfabricated biodegradable sensors can play a strong impact in acute or transient biomedical applications. However, the design of a high-performing electronic system, both fully biodegradable and wireless, is a very complex issue, particularly at small scales. The associated technologies are still in their infancy step and they should be more deeply and extensively investigated in animal models and, successively, in humans, to be clinically implemented. In this context, the present manuscript is aimed to provide a complete overview about wireless biodegradable implantable sensors, covering from the vital signs to be monitored, the involved wireless technologies, the biodegradable materials used for the production of the devices, the designed devices and their applications. Particularly both their adavantages and drawbacks are highlighted and the key challenges to be faced up, mainly associated to the fabrication techniques, and the control over degradation kinetics and biocompatibility of the device, are reported and discussed.

ACS Style

Michele De Santis; Ilaria Cacciotti. Wireless implantable and biodegradable sensors for postsurgery monitoring: current status and future perspectives. Nanotechnology 2020, 31, 252001 .

AMA Style

Michele De Santis, Ilaria Cacciotti. Wireless implantable and biodegradable sensors for postsurgery monitoring: current status and future perspectives. Nanotechnology. 2020; 31 (25):252001.

Chicago/Turabian Style

Michele De Santis; Ilaria Cacciotti. 2020. "Wireless implantable and biodegradable sensors for postsurgery monitoring: current status and future perspectives." Nanotechnology 31, no. 25: 252001.

Journal article
Published: 26 January 2019 in Energies
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This paper deals with the problem of the voltage profile optimization in a distribution system including distributed energy resources. Adopting a centralized approach, the voltage optimization is a non-linear programming problem with large number of variables requiring a continuous remote monitoring and data transmission from/to loads and distributed energy resources. In this study, a recently-proposed Jacobian-based linear method is used to model the steady-state operation of the distribution network and to divide the network into voltage control zones so as to reformulate the centralized optimization as a quadratic programming of reduced dimension. New clustering methods for the voltage control zone definition are proposed to consider the dependence of the nodal voltages on both active and reactive powers. Zoning methodologies are firstly tested on a 24-nodes low voltage network and, then, applied to the voltage optimization problem with the aim of analyzing the impact of the R/X ratios on the zone evaluation and on the voltage optimization solution.

ACS Style

Anna Rita Di Fazio; Mario Russo; Michele De Santis. Zoning Evaluation for Voltage Optimization in Distribution Networks with Distributed Energy Resources. Energies 2019, 12, 390 .

AMA Style

Anna Rita Di Fazio, Mario Russo, Michele De Santis. Zoning Evaluation for Voltage Optimization in Distribution Networks with Distributed Energy Resources. Energies. 2019; 12 (3):390.

Chicago/Turabian Style

Anna Rita Di Fazio; Mario Russo; Michele De Santis. 2019. "Zoning Evaluation for Voltage Optimization in Distribution Networks with Distributed Energy Resources." Energies 12, no. 3: 390.

Journal article
Published: 19 December 2018 in Energies
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Brushless electric motors are used intensively in the industrial automation sector due to the motors low inertia and fast response. According to the International Electrotechnical Commission, IEC 60034-2-1, the efficiency of a three-phase electric machine (excluding machines for traction vehicles) can be determined by direct or indirect techniques. In the case of small traction motors (

ACS Style

Michele De Santis; Sandro Agnelli; Fabrizio Patanè; Oliviero Giannini; Gino Bella. Experimental Study for the Assessment of the Measurement Uncertainty Associated with Electric Powertrain Efficiency Using the Back-to-Back Direct Method. Energies 2018, 11, 3536 .

AMA Style

Michele De Santis, Sandro Agnelli, Fabrizio Patanè, Oliviero Giannini, Gino Bella. Experimental Study for the Assessment of the Measurement Uncertainty Associated with Electric Powertrain Efficiency Using the Back-to-Back Direct Method. Energies. 2018; 11 (12):3536.

Chicago/Turabian Style

Michele De Santis; Sandro Agnelli; Fabrizio Patanè; Oliviero Giannini; Gino Bella. 2018. "Experimental Study for the Assessment of the Measurement Uncertainty Associated with Electric Powertrain Efficiency Using the Back-to-Back Direct Method." Energies 11, no. 12: 3536.

Proceedings article
Published: 01 September 2017 in 2017 IEEE International Ultrasonics Symposium (IUS)
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A few years ago, some of the authors proposed an ultrasound technique for achieving 3D palm vein patterns for biometric recognition purposes. That technique was developed with a commercial imaging system using doppler modality. Unfortunately, even if results were promising, the acquisition time was too long for practical applications. More recently, they proposed an effective recognition system that employs an ultrasound research scanner (ULA-OP), a CNC pantograph and a high frequency (12 MHz) commercial probe. The system is able to acquire 3D image of the human palm (38×25×15 mm3) in about 4 seconds. Successively, they developed a procedure to extract palmprint features and validated it with verification and identification experiments on a consistent ad hoc established database. In this work, a new method for extracting palm vein pattern is proposed. The procedure uses as input the same 3D images already exploited for extracting palmprint features, as matter of fact upgrading the recognition system to a multimodal system.

ACS Style

Michele De Santis; Sandro Agnelli; Donatella Nardiello; Antonio Iula. 3D ultrasound palm vein recognition through the centroid method for biometric purposes. 2017 IEEE International Ultrasonics Symposium (IUS) 2017, 1 -1.

AMA Style

Michele De Santis, Sandro Agnelli, Donatella Nardiello, Antonio Iula. 3D ultrasound palm vein recognition through the centroid method for biometric purposes. 2017 IEEE International Ultrasonics Symposium (IUS). 2017; ():1-1.

Chicago/Turabian Style

Michele De Santis; Sandro Agnelli; Donatella Nardiello; Antonio Iula. 2017. "3D ultrasound palm vein recognition through the centroid method for biometric purposes." 2017 IEEE International Ultrasonics Symposium (IUS) , no. : 1-1.

Proceedings article
Published: 01 September 2017 in 2017 IEEE International Ultrasonics Symposium (IUS)
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In this work, a new method for extracting palm vein pattern is proposed. The procedure uses as input the 3D ultrasound images of a portion of the hand volume acquired with a fast and reliable system recently proposed. The method detects low brightness areas in B-mode images and then selects the vectors that specify the centers of mass of these dark regions (centroids). Vein patterns are defined whenever centroids are found in the surrounding of the same coordinates for a certain number of consecutive B-mode images. A first validation of the method was achieved by extracting a single vein pattern for several samples and performing verification experiments with two different matching approaches.

ACS Style

Michele De Santis; Sandro Agnelli; Donatella Nardiello; Antonio Iula. 3D ultrasound palm vein recognition through the centroid method for biometric purposes. 2017 IEEE International Ultrasonics Symposium (IUS) 2017, 1 -4.

AMA Style

Michele De Santis, Sandro Agnelli, Donatella Nardiello, Antonio Iula. 3D ultrasound palm vein recognition through the centroid method for biometric purposes. 2017 IEEE International Ultrasonics Symposium (IUS). 2017; ():1-4.

Chicago/Turabian Style

Michele De Santis; Sandro Agnelli; Donatella Nardiello; Antonio Iula. 2017. "3D ultrasound palm vein recognition through the centroid method for biometric purposes." 2017 IEEE International Ultrasonics Symposium (IUS) , no. : 1-4.

Journal article
Published: 04 October 2016 in Energies
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A key issue in Low Voltage(LV) distribution systems is to identify strategies for the optimal management and control in the presence of Distributed Energy Resources (DERs). To reduce the number of variables to be monitored and controlled, virtual levels of aggregation, called Virtual Microgrids (VMs), are introduced and identified by using new models of the distribution system. To this aim, this paper, revisiting and improving the approach outlined in a conference paper, presents a sensitivity-based model of an LV distribution system, supplied by a Medium/Low Voltage (MV/LV) substation and composed by several feeders, which is suitable for the optimal management and control of the grid and for VM definition. The main features of the proposed method are: it evaluates the sensitivity coefficients in a closed form; it provides an overview of the sensitivity of the network to the variations of each DER connected to the grid; and it presents a limited computational burden. A comparison of the proposed method with both the exact load flow solutions and a perturb-and-observe method is discussed in a case study. Finally, the method is used to evaluate the impact of the DERs on the nodal voltages of the network.

ACS Style

Anna Rita Di Fazio; Mario Russo; Sara Valeri; Michele De Santis. Sensitivity-Based Model of Low Voltage Distribution Systems with Distributed Energy Resources. Energies 2016, 9, 801 .

AMA Style

Anna Rita Di Fazio, Mario Russo, Sara Valeri, Michele De Santis. Sensitivity-Based Model of Low Voltage Distribution Systems with Distributed Energy Resources. Energies. 2016; 9 (10):801.

Chicago/Turabian Style

Anna Rita Di Fazio; Mario Russo; Sara Valeri; Michele De Santis. 2016. "Sensitivity-Based Model of Low Voltage Distribution Systems with Distributed Energy Resources." Energies 9, no. 10: 801.