ABSTRACT In this paper, a performance analysis of Permanent Magnet Synchronous Machines (PMSMs) for High-Speed Flywheel Energy Storage Systems (HS-FESSs) to be employed in Electric and Hybrid Electric Vehicles is presented. It aims to... more
ABSTRACT In this paper, a performance analysis of Permanent Magnet Synchronous Machines (PMSMs) for High-Speed Flywheel Energy Storage Systems (HS-FESSs) to be employed in Electric and Hybrid Electric Vehicles is presented. It aims to identify optimal speed ranges, within which HS-FESS performances can be appropriately maximized, especially in terms of efficiency. Thus, a modeling of PMSM operating constraints (voltage saturation, current limitation, etc.) is carried out at first. This enables an appropriate analysis of PMSM performances within its operating boundaries. As a result, PMSM efficiency maps can be achieved, which allow the identification of suitable operating conditions for HS-FESS. The effectiveness of the proposed approach is proved by means of both analytical and simulation results, which regards two highspeed PMSMs operating over different torque, power and/or speed ranges.
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In this paper, a predictive direct torque control (DTC) of induction motor (IM) drive is presented. The control uses stator flux and current vectors as state variables. Predicted torque variation, with reference to its unforced response... more
In this paper, a predictive direct torque control (DTC) of induction motor (IM) drive is presented. The control uses stator flux and current vectors as state variables. Predicted torque variation, with reference to its unforced response during each sampling time interval, is imposed with the aim of determining the pulse widths of the chain voltages of the supply inverter. The
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Wide band gap devices are inevitably the future of power electronic converters. However, their high switching speeds make the gate driver design a challenging task. In this way, parameterization of the gate driver resistors is critical to... more
Wide band gap devices are inevitably the future of power electronic converters. However, their high switching speeds make the gate driver design a challenging task. In this way, parameterization of the gate driver resistors is critical to determine the slew rate and consequently the produced power loss and electromagnetic noise of the switch. To address these issues, in this paper, a post-prototyping multi-objective optimization method is introduced in order to parameterize the gate driver resistors. The method then is applied on a GaN-based half-bridge converter to reduce both power loss and electromagnetic noise. To evaluate the electromagnetic noise, near-field EMI of the GaN device is considered. Finally, the experimental results are provided to show the effectiveness of the method.
Research Interests: Computer Science and Emi
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This paper deals with the variable structure system (VSS) approach to the permanent magnet (PM) DC motor speed control. The aim of this treatment is that of proposing a novel scheme based on second order sliding mode control (SOSMC)... more
This paper deals with the variable structure system (VSS) approach to the permanent magnet (PM) DC motor speed control. The aim of this treatment is that of proposing a novel scheme based on second order sliding mode control (SOSMC) technique. The main features of the proposed scheme are the robustness against heavy motor parameters variations and the avoidance of the current loop implementation, which is generally requested by traditional approaches. The precise knowledge of the motor parameters is not requested, and the insensitivity to smooth unknown load torque disturbance is obtained. Moreover, some issues associated with the practical implementation of the control scheme, mainly linked to the current ripple amplitude, are discussed, and experimental investigations are reported to show the effectiveness of the proposed approach
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ABSTRACT A novel electromagnetic characterization of Implantable Cardiac Medical Devices (ICMDs) is presented in this paper. It has been developed in order to determine the immunity level of ICMDs against Radio-Frequency (RF) interference... more
ABSTRACT A novel electromagnetic characterization of Implantable Cardiac Medical Devices (ICMDs) is presented in this paper. It has been developed in order to determine the immunity level of ICMDs against Radio-Frequency (RF) interference and consists of several Sensitivity Tests, which have been performed in accordance with EMC international standards. The tests have been carried out in an anechoic RF chamber, which guarantees an appropriate management of noise signal injection, shielding against external RF noise sources at the same time. In this way, the operating thresholds of an Implantable Cardiac Defibrillator (ICD) have been achieved at different heartbeat frequency, with and without high-frequency noise. As a result, the comparison between the operating thresholds highlight the electromagnetic susceptibility of the ICD under test.
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ABSTRACT At the present time the direct field oriented (DFO) control is the widely used control technique in high-performance induction motor (IM) drive. It requires the implementation of a state vector observer for the detection of rotor... more
ABSTRACT At the present time the direct field oriented (DFO) control is the widely used control technique in high-performance induction motor (IM) drive. It requires the implementation of a state vector observer for the detection of rotor flux vector. The IM drive performance is strictly connected to that of the rotor flux observer. The motor parameter variations cause the observer mismatching and hence, the IM drive performance degradation. In the present paper an adaptive observer is proposed which allows the on-line rotor time-constant tuning. The identification of the rotor time constant is performed by an MRAS approach. The adaptive observer is synthesized using the Lyapunov stability theory. To improve the speed convergence of the identifier and the selectivity characteristic of the proposed adaptive observer, a time- varying gain has been introduced. The stability of the overall system has been verified using the Lyapunov stability theory. The simulation results evidence the good performance of the proposed observer and of the overall DFO controlled drive. In particular, the interactive effects between observer and identifier gains are evidenced and, thus, used for the selection of the identifier time-varying gain. Copyright © 2000 John Wiley & Sons, Ltd.
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Research Interests: Engineering, Power Electronics, Higher Order Thinking, System Theory, Parameter Identification, and 13 moreReal Time, Steady state, Reference model, Constant Time Delay, Digital Signal Processor, Operant Conditioning, Model reference adaptive control, Induction Motor, Lyapunov function, Electrical And Electronic Engineering, Induction Motor Drive, Persistent Excitation, and Higher order
ABSTRACT An optimal energy storage system (ESS) management procedure devoted to full renewable energy sources (RESs) exploitation is presented in this paper. It consists of an appropriate scheduling procedure and a real-time control... more
ABSTRACT An optimal energy storage system (ESS) management procedure devoted to full renewable energy sources (RESs) exploitation is presented in this paper. It consists of an appropriate scheduling procedure and a real-time control strategy, which both aim to increase the RES penetration level as much as possible. In particular, the one-day-ahead scheduling procedure synthesizes the combined RES-ESS energy production profile with the aim of minimizing the RES energy production curtailments by means of ESS energy buffering. The real-time control strategy is developed in order to track the scheduled profile as well as possible by mitigating forecasting errors, thus improving RES reliability. The worth and effectiveness of the proposed management procedure is verified through a wide simulation study, which is carried out by means of the Matlab software package.
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In this paper the designs, realization and indoor and outdoor experimental results of a laboratory test facility system for Concentrator Photovoltaic Receivers (CPR) characterization are reported. In particular, the proposed system has... more
In this paper the designs, realization and indoor and outdoor experimental results of a laboratory test facility system for Concentrator Photovoltaic Receivers (CPR) characterization are reported. In particular, the proposed system has been developed in order to perform tests on CPRs characterized by high geometrical concentration factor (Cgeo). The test facility system is devoted to verify and qualify the behavior of CPR from different points of view. The system design has been developed paying particular attention to the test bench used for the evaluation of I-V characteristics of concentrator solar cells under high geometrical concentration factors. The preliminary study activity has been focused on the irradiance level, light source spectral composition, exposition time and operation temperature dependences of CPR characterization process. The main purpose of this research is to propose in the next future novel tests to qualify the CPR system for a long-time operation (Light-Soa...
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Page 1. Synthesis and Digital Implementation of a Reduced Order Rotor Flux Observer for IM Drive ... IV. DIGITAL IMPLEMENTATION OF THE OBSERVER ... T z[k + I]= eMTz[k]+ ON i, [k]+ kjeMTv, [k] (30) 0 being T The M matrix turns out to have... more
Page 1. Synthesis and Digital Implementation of a Reduced Order Rotor Flux Observer for IM Drive ... IV. DIGITAL IMPLEMENTATION OF THE OBSERVER ... T z[k + I]= eMTz[k]+ ON i, [k]+ kjeMTv, [k] (30) 0 being T The M matrix turns out to have the following structure M=[a ba -7 ...
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... Auchen. Germany, 2004 For all these reasons the only method actually used to predict the EM1 behavior of a given system is the numeric simulation.[3] Y, = jY,C tan[fl(;+Ad)] ... k = 1,2 .... N -1; Y,, + jY,' tan@d) Y l + jY,,... more
... Auchen. Germany, 2004 For all these reasons the only method actually used to predict the EM1 behavior of a given system is the numeric simulation.[3] Y, = jY,C tan[fl(;+Ad)] ... k = 1,2 .... N -1; Y,, + jY,' tan@d) Y l + jY,, tan@d)' '%.I) 'Zk+I = yt y,,+, = y,C Y,' + jY,, tan[fl[F+Ad)] ...
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ABSTRACT A predictive digital control of the synchronous reluctance motor drive is presented in this paper. The proposed control uses a recursive algorithm in which the reference values of d and q current components in rotor coordinates... more
ABSTRACT A predictive digital control of the synchronous reluctance motor drive is presented in this paper. The proposed control uses a recursive algorithm in which the reference values of d and q current components in rotor coordinates are imposed. The digital control system directly synthesizes the output vector which consists of the inverter on/off switches states. This technique results in avoiding the implementation of the traditional PI controllers and PWM technique. Under transient operation, the proposed algorithm allows the imposition of both the reference d-q current components, in order to achieve the maximum torque variation available during each sampling interval. The algorithm takes into account the magnetic cross saturation effects and the inverter voltage saturation constraint. So, the proposed control gets the fastest torque trajectory that can be exploited by the drive. Especially starting from rest, it can be shown that the proposed algorithm guarantees optimal torque step response. After the steady state torque is reached, the d-q current values, corresponding to the above torque, do not guarantee any further condition. Therefore, the proposed algorithm easily drives the above current components to the minimum Joule losses operating conditions, simultaneously keeping constant the torque value achieved. Hence, the proposed control algorithm gets the fastest start-up and the maximum efficiency, at the same time. A computer simulation study, using the Matlab Simulink tool, is conducted on the drive with the aim of highlighting the better performance of the proposed algorithm compared to the traditional and predictive (non optimal) ones.
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Research Interests: Applied Mathematics, Stability, Control Systems, Sampling methods, Measurement Errors, and 12 moreSliding mode control, Measurement Error, Spline, Robustness, Second Order, Operant Conditioning, Electric Drive, Induction Motor, Sliding Mode, Torque, Nonlinear State Estimation, and Electrical And Electronic Engineering
Control of a Jib-Type Crane Mounted on a Flexible Structure....................... K. Takagi and H. Nishimura 32 Application of Dual-Rate Modeling to CCR Octane Quality Inferential Control... D. Li, SL Shah, T. Chen, and KZ Qi 43 Tracking Control of an Underactuated Ship........................ E...more
A predictive control of a brushless DC generator is presented in this paper. Starting from the reference value of the electromagnetic torque developed by the generator, in order to satisfy the requirement of the tracking characteristic of... more
A predictive control of a brushless DC generator is presented in this paper. Starting from the reference value of the electromagnetic torque developed by the generator, in order to satisfy the requirement of the tracking characteristic of the prime-mover, the switching pattern of the AC/DC converter is determined at each sampling period. The inverter commands are determined on the basis
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ABSTRACT An improved averaged model suitable for boost DC-DC converters is presented in this paper. It is developed on the basis of the averaging technique with the aim of appropriately taking into account the effects of switching... more
ABSTRACT An improved averaged model suitable for boost DC-DC converters is presented in this paper. It is developed on the basis of the averaging technique with the aim of appropriately taking into account the effects of switching phenomena. Thus, two appropriate trapezoidal signals have been introduced in order to model the transient evolutions of voltages and currents of the DC-DC converter devices over both turn-on and turn-off of the switch. This enables the synthesis of an appropriate averaged model of boost DC-DC converters, which can be usefully employed in determining average voltage and current evolutions, as well as steady state average powers. The worth and effectiveness of the proposed modelling approach has been validated through a simulation study, which refers to the case of a traditional boost DC-DC converter.
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ABSTRACT
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An adaptive speed sensor-less fourth order observer for on-line estimating rotor flux and speed in induction motor drives is presented in the paper. The synthesis procedure of the adaptive observer is based on the hyper-stability theory.... more
An adaptive speed sensor-less fourth order observer for on-line estimating rotor flux and speed in induction motor drives is presented in the paper. The synthesis procedure of the adaptive observer is based on the hyper-stability theory. Assuming the speed as unknown parameter of the rotor flux observer, the on-line identification process of its value has been set-up. The adaptation mechanism of the rotor speed and the gain matrix of the observer have been chosen so that stable operation is assured. The stability is tested using the hyperstability theory. The parameter (speed) convergence is assured thanks to the persistent exciting propriety of the input vector. Simulation tests conducted on the observer and on a field oriented controlled drive, using the proposed adaptive observer, show the convergent trajectories of the speed and of the state error vector under various significant steady state and transient operating condition and for different values of the adaptation gains. The results show the satisfactory behaviour of the proposed adaptive observer.
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In this paper, a sliding mode based induction motor drive control technique is proposed. It allows to control the speed and the stator flux magnitude, using just their measure and/or estimation, imposing directly the inverter voltage... more
In this paper, a sliding mode based induction motor drive control technique is proposed. It allows to control the speed and the stator flux magnitude, using just their measure and/or estimation, imposing directly the inverter voltage configuration. The mathematical modelisation of the proposed algorithm and the simulation results are reported to confirm the proposed control technique
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ABSTRACT A novel continuous-time equivalent circuit suitable for boost DC-DC converters is presented in this paper. It has been developed on the basis of the averaging technique with the aim of achieving a good ripple-free representation... more
ABSTRACT A novel continuous-time equivalent circuit suitable for boost DC-DC converters is presented in this paper. It has been developed on the basis of the averaging technique with the aim of achieving a good ripple-free representation of the state variables of the system, whatever the converter operating mode is, i.e. Continuous Conduction Mode (CCM) or Discontinuous Conduction Mode (DCM). This goal can be achieved on condition that an appropriate PWM pattern is introduced, which enables an almost perfect matching between state variables and their corresponding equivalent ones at the start of each sampling time interval. Apart from the inductor and the capacitor, the proposed circuit consists of some equivalent input voltage and output current sources, together with several constant and/or variable resistors, which depend on converter switching signals and circuital parameters. The proposed continuous-time equivalent circuit has been validated through a simulation study, which is performed by means of the software PLECS. Simulation results highlight the worth and the effectiveness of the proposed modelling approach, over both transient and steady state operations.
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ABSTRACT A comparison between two-phase-on (2PO) and three-phase-on operation (3PO) for Three-phase Brushless DC machines (BLDCs) is presented in this paper. It aims to highlight the different BLDC exploitation achievable by means of 3PO... more
ABSTRACT A comparison between two-phase-on (2PO) and three-phase-on operation (3PO) for Three-phase Brushless DC machines (BLDCs) is presented in this paper. It aims to highlight the different BLDC exploitation achievable by means of 3PO compared to that obtainable by 2PO. For this purpose, two different control strategies are considered, i.e. a traditional 2PO-based and a 3PO-based, whose main details are briefly analyzed and discussed. Subsequently, they are compared to each other referring to the case of a BLDC. The comparison reveals improved BLDC performances achievable by means of 3PO in terms of averaged torque, torque ripple and Joule losses reduction, especially at high-speed operation.
In order to show that a given set of EM sources comply with national rules on exposition, a prediction model for EM propagation is needed. For indoor environment, the test presented her show that reflections and multipath can... more
In order to show that a given set of EM sources comply with national rules on exposition, a prediction model for EM propagation is needed. For indoor environment, the test presented her show that reflections and multipath can significantly affect the field level respect to the free-space situation, which sometimes can doubles.
ABSTRACT The brushless DC generator controlled by a predictive algorithm is considered in this paper. It is able to develop excellent performances such as minimum Joule losses and minimum torque ripple, at the same time. The tracking... more
ABSTRACT The brushless DC generator controlled by a predictive algorithm is considered in this paper. It is able to develop excellent performances such as minimum Joule losses and minimum torque ripple, at the same time. The tracking characteristic of the prime-mover is mandatory for setting the reference value of the electromagnetic torque developed by the generator, by means of which the switching pattern of the AC/DC converter is determined at each sampling time interval. The above generator performances are possible under certain constrained values of reference torque and rotor speed, due to the DC-bus voltage saturation. The knowledge of these quantities are necessary for the best matching of the prime-mover with the brushless DC generator and the AC/DC converter. In this paper, these constraints are investigated in detail with the aim of highlighting the best operation of the conversion system under a constant DC bus voltage.
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Plug-in Electric Vehicle (EV) is considered one of the most promising technology to implement the distributed storage because it combines social mobility need and environmental issue with technological function. The application of... more
Plug-in Electric Vehicle (EV) is considered one of the most promising technology to implement the distributed storage because it combines social mobility need and environmental issue with technological function. The application of Vehicle-to-Grid concept (V2G) allows the storage energy management based on EV to be economic sustainable too. In the present paper, the authors present a model to evaluate the
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ABSTRACT In this paper, a torque control algorithm for direct drive wind turbines using a twelve-phase permanent magnet synchronous electrical machine is proposed. An electrical machine oriented to output four independent 3-phase star... more
ABSTRACT In this paper, a torque control algorithm for direct drive wind turbines using a twelve-phase permanent magnet synchronous electrical machine is proposed. An electrical machine oriented to output four independent 3-phase star subsystems have been introduced in order to improve direct drive wind turbine torque control, power generation and reliability. A specific coordinate transformation for multi-phase electrical machine control that allows the independent and decoupled management of each electric three-phase subsystem has been developed. The synthesis and the simulation results of the proposed control algorithm are presented.
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In this paper a Decision Support System (DSS) algorithm based on a multi-criteria analysis which allows us to determine the most suitable biomass energy basins for smart grid development is proposed. The energy management and planning DSS... more
In this paper a Decision Support System (DSS) algorithm based on a multi-criteria analysis which allows us to determine the most suitable biomass energy basins for smart grid development is proposed. The energy management and planning DSS algorithm is based on dedicated GIS functionalities which have allowed an easier mathematical management of spatial data and an integration of the database
Research Interests: Environmental Economics, Renewable Energy, Biomass, Decision Support Systems, Smart Grid, and 12 moreEnergy Management, Decision support system, Smart grids, Economic analysis, Load distribution, Spatial Data, Smart Grids, Support System, Geographic Information Systems, Electrical Network, Orography, and Multi criteria analysis
ABSTRACT A predictive current control algorithm for the Buck-Boost DC-DC converter is presented in this paper. The continuous time model of the system is properly introduced, then, by imposing a proper PWM modulation pattern, its discrete... more
ABSTRACT A predictive current control algorithm for the Buck-Boost DC-DC converter is presented in this paper. The continuous time model of the system is properly introduced, then, by imposing a proper PWM modulation pattern, its discrete time model is achieved. This last one is successfully employed in determining the steady state locus of the Buck-Boost converter, both in Continuous Conduction Mode (CCM) and Discontinuous Conduction Mode (DCM). A novel continuous time equivalent circuit of the converter is introduced too, with the aim of determining a ripple free representation of the state variables of the system, both over transient and steady state operation. Then, a predictive current control algorithm, suitable in both CCM and DCM, is developed and properly checked by means of computer simulations. The corresponding results have highlighted the effectiveness of the proposed modelling and of the predictive control algorithm, both in CCM and DCM.
In this paper, a predictive digital control of the synchronous reluctance motor drive is presented. The proposed control, implemented in rotor coordinates, is based on a recursive algorithm in which the reference values of d and q current... more
In this paper, a predictive digital control of the synchronous reluctance motor drive is presented. The proposed control, implemented in rotor coordinates, is based on a recursive algorithm in which the reference values of d and q current components are imposed. The digital control system directly synthesizes the output vector which allows the timing control of the inverter by means
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A novel modulation technique suitable for the current control of brushless DC drives under commutation is presented in the paper. The pulse width of the chain voltages are determined by means of a predictive algorithm under the... more
A novel modulation technique suitable for the current control of brushless DC drives under commutation is presented in the paper. The pulse width of the chain voltages are determined by means of a predictive algorithm under the constraints of minimum Joule losses and torque ripple free commutation. At maximum speed the torque ripple appears but is lower than that of
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... The identification algorithm is properly tested on a BLDC drive controlled by a predictive algorithm ... With the aim of reducing the torque ripple and increasing the efficiency of Brushless DC motors ... of all these ones are... more
... The identification algorithm is properly tested on a BLDC drive controlled by a predictive algorithm ... With the aim of reducing the torque ripple and increasing the efficiency of Brushless DC motors ... of all these ones are summarized and discussed in [3]. Since the motors emf shape ...