20 results on '"Spagnuolo, Giovanni"'
Search Results
2. Power stage design of fourth-order dc-dc converters by means of principal components analysis
- Author
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De Nardo, Antonietta, Femia, Nicola, Nicolo, Marco, Petrone, Giovanni, and Spagnuolo, Giovanni
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Electric current converters -- Design and construction ,Principal components analysis -- Methods ,Circuit design -- Evaluation ,Power electronics -- Research ,Electric current converter ,Circuit designer ,Integrated circuit design ,Business ,Electronics ,Electronics and electrical industries - Abstract
The design of fourth-order dc-dc converters is discussed in this paper. The Principal Components Analysis is applied to find the set of passive components which allows to avoid double resonance in the control-to-output transfer function. The design of a synchronous SEPIC converter has been studied as an application of the proposed design methodology by using a database of real passive components. The performances of the SEPIC converter designed with the proposed methodology are verified through both time domain and frequency domain simulations and they are compared with those ones achieved by standard ripple-based design procedures. Index Terms--Fourth-order converters, power stage design, principal components analysis, SEPIC converter.
- Published
- 2008
3. Maximum power point tracking in a one-cycle-controlled single-stage photovoltaic inverter
- Author
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Fortunato, Mario, Giustiniani, Alessandro, Petrone, Giovanni, Spagnuolo, Giovanni, and Vitelli, Massimo
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Electric inverters -- Design and construction ,Algorithms -- Usage ,Photovoltaic power generation -- Equipment and supplies ,Photovoltaic power generation -- Management ,Solar energy research ,Company business management ,Algorithm ,Business ,Computers ,Electronics ,Electronics and electrical industries - Abstract
In this paper, the design of the one-cycle controller of a single-stage inverter for photovoltaic applications is carried out by means of a multiobjective strategy to optimize inverter performance at both high and low insolation levels. Design constraints that account for different weather conditions are adopted. The optimization algorithm also provides useful information concerning the system sensitivity with respect to each of the controller parameters. This allows the design of a maximum power point tracking perturb and observe controller that significantly improves inverter performance. Experimental measurements confirm the predictions of theoretical and simulation results. Index Terms--Maximum power point tracking (MPPT) techniques, one-cycle control (OCC), photovoltaic (PV) inverter.
- Published
- 2008
4. Distributed maximum power point tracking of photovoltaic arrays: novel approach and system analysis
- Author
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Femia, Nicola, Lisi, Gianpaolo, Petrone, Giovanni, Spagnuolo, Giovanni, and Vitelli, Massimo
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Photovoltaic power generation -- Equipment and supplies ,Photovoltaic power generation -- Management ,Solar power plants -- Equipment and supplies ,Solar power plants -- Management ,System design -- Methods ,Systems analysis -- Methods ,System design ,Company business management ,Business ,Computers ,Electronics ,Electronics and electrical industries - Abstract
One of the major drawbacks of photovoltaic (PV) systems is represented by the effect of module mismatching and of partial shading of the PV field. Distributed maximum power point tracking (DMPPT) is a very promising technique that allows the increase of efficiency and reliability of such systems. Modeling and designing a PV system with DMPPT is remarkably more complex than implementing a standard MPPT technique. In this paper, a DMPPT system for PV arrays is proposed and analyzed. A dc and small-signal ac model is derived to analyze steady-state behavior, as well as dynamics and stability, of the whole system. Finally, simulation results are reported and discussed. Index Terms--Distributed generation, maximum power point tracking (MPPT) techniques, photovoltaic (PV) systems.
- Published
- 2008
5. Reliability issues in photovoltaic power processing systems
- Author
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Petrone, Giovanni, Spagnuolo, Giovanni, Teodorescu, Remus, Veerachary, Mummadi, and Vitelli, Massimo
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Electric power systems -- United States ,Electric power systems -- Research ,Reliability (Engineering) -- Evaluation ,Photovoltaic power generation -- Methods ,Solar energy -- Research ,Business ,Computers ,Electronics ,Electronics and electrical industries - Abstract
Power processing systems will be a key factor of future photovoltaic (PV) applications. They will play a central role in transferring, to the load and/or to the grid, the electric power produced by the high-efficiency PV cells of the next generation. In order to come up the expectations related to the use of solar energy for producing electrical energy, such systems must ensure high efficiency, modularity, and, particularly, high reliability. The goal of this paper is to provide an overview of the open problems related to PV power processing systems and to focus the attention of researchers and industries on present and future challenges in this field. Index Terms--Inverters, maximum power point tracking (MPPT), photovoltaic (PV) systems, power electronics, power processing, solar energy.
- Published
- 2008
6. Optimization of perturb and observe maximum power point tracking method
- Author
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Femia, Nicola, Petrone, Giovanni, Spagnuolo, Giovanni, and Vitelli, Massimo
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Power electronics ,Algorithms ,Algorithm ,Business ,Electronics ,Electronics and electrical industries - Abstract
Maximum power point tracking (MPPT) techniques are used in photovoltaic (PV) systems to maximize the PV array output power by tracking continuously the maximum power point (MPP) which depends on panels temperature and on irradiance conditions. The issue of MPPT has been addressed in different ways in the literature but, especially for low-cost implementations, the perturb and observe (P&O) maximum power point tracking algorithm is the most commonly used method due to its ease of implementation. A drawback of P&O is that, at steady state, the operating point oscillates around the MPP giving rise to the waste of some amount of available energy; moreover, it is well known that the P&O algorithm can be confused during those time intervals characterized by rapidly changing atmospheric conditions. In this paper it is shown that, in order to limit the negative effects associated to the above drawbacks, the P&O MPPT parameters must be customized to the dynamic behavior of the specific converter adopted. A theoretical analysis allowing the optimal choice of such parameters is also carried out. Results of experimental measurements are in agreement with the predictions of theoretical analysis. Index Terms--Maximum power point (MPP), maximum power point tracking (MPPT), perturb and observe (P&O), photovoltaic (PV).
- Published
- 2005
7. Tolerance design of controllers for switching regulators
- Author
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Petrone, Giovanni and Spagnuolo, Giovanni
- Subjects
Electric current converters -- Research ,Electric current converter ,Aerospace and defense industries ,Business ,Computers ,Electronics ,Electronics and electrical industries - Abstract
An evolutionary approach to worst case tolerance design is introduced here, with a focus on feedback compensation networks for dc-dc switching converters. Assumed that varying parameters values are uniformly distributed and uncorrelated, as provided by the worst case approach, the proposed algorithm, of general applicability, seeks for the set of nominal values and tolerances of the circuit parameters ensuring that the design constraints are met and that a user-defined circuit performance index assumes its optimal value. Design constraints are fixed in the frequency domain, in terms of acceptability ranges of loop gain crossover frequency and phase margin, to guarantee closed loop stability and the desired dynamic performance. Resistive and capacitive compensation network's parameters values are chosen within a suitable database of couples nominal value/tolerance available on the market, while the nominal values and tolerances of the parameters of the power stage are fixed. Referring to a buck dc-dc switching regulator, two widely used different compensation network topologies are compared in terms of reliability, robustness, and cast of components. Simulation results show the wide usefulness of the proposed method in supporting designer decisions.
- Published
- 2004
8. Variability analysis of composite materials for stress relief in cable accessories
- Author
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De Vivo, Biagio, Spagnuolo, Giovanni, and Vitelli, Massimo
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Electromagnetism -- Research ,Business ,Electronics ,Electronics and electrical industries - Abstract
This paper introduces an evolutionary approach to the variability analysis of nonlinear systems. The algorithm shows some advantages with respect to classical stochastic approaches and, in particular, with respect to Monte Carlo-based methods. First, it allows a significant reduction of the underestimation error that affects any nondeterministic approach; in other words, it guarantees a considerable saving of simulation time. Moreover, the technique ensures a higher reliability in pursuing the true range of variation of the system performance of interest. The method has been applied to a practical problem of great interest: the variability analysis of a stress control tube made of a composite material used for electric stress relief in cable accessories. The cable termination has been modeled by means of a lumped nonlinear circuit. The proposed technique also provides reliable results whenever large parameter variations need to be taken into account and/or nonlinear functions of varying parameters are considered. Simulation results prove it to be of great support for the designer in cable termination dimensioning and in composite material selection. Index Terms--Cable accessories, composite materials, variability analysis.
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- 2004
9. Worst case tolerance design of magnetic devices by evolutionary algorithms
- Author
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Spagnuolo, Giovanni
- Subjects
Magnetic devices -- Research ,Business ,Electronics ,Electronics and electrical industries - Abstract
This paper presents an evolutionary approach to worst case tolerance design of magnetic devices. The algorithm improves on the classical nominal design, accounting for parameter variations and tolerances, so that the system performance does not exceed upper and lower specifications imposed in advance by the designer. The evolutionary algorithm adjusts central values and tolerances of parameters so that a user-defined objective function is optimized and the design constraints are met. The feasibility of the candidate sets of design parameters and tolerances is estimated by means of vertex analysis. The algorithm ensures that the optimized design set of parameters and tolerances is 100% feasible in a large number of practical eases. This paper gives an example of the design of a magnetic device and discusses the salient features and limitations of the approach. Index Terms--Genetic algorithms, tolerance analysis, tolerance design.
- Published
- 2003
10. Steady-state analysis of hard and soft switching dc-to-dc regulators
- Author
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Femia, Nicola, Spagnuolo, Giovanni, and Vitelli, Massimo
- Subjects
Power electronics -- Research ,Business ,Electronics ,Electronics and electrical industries - Abstract
In this paper, a unified method for steady-state analysis of hard-switching and soft-switching dc-to-dc converters is presented. The power stage and the feedback control circuit forming the regulator are modeled separately and analyzed as two interconnected blocks. The intersection of the open loop dc steady-state characteristics of these cascaded blocks provides the initial condition for a guess candidate steady-state solution (CS). The CS is validated as true steady-state solution (TS) if the bias conditions of switching devices are fulfilled everywhere in the switching period, otherwise the CS is changed according to the conditions violated. The CS approaches the TS through an iterative process of validation. The basic tools adopted to ensure a reliable computation of the CS are interval analysis (IA), for the identification of the commutation instants (CI), and the compensation theorem (CT), for the analysis of commutations. Some examples of applications to hard-switching and soft-switching dc-dc regulators are presented. Index Terms--Steady-state analysis, switching regulators.
- Published
- 2003
11. Steady-state analysis of PWM DC-to-DC regulators
- Author
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Femia, Nicola, Spagnuolo, Giovanni, and Vitelli, Massimo
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Aerospace engineering -- Research ,Avionics -- Research ,Pulse-duration modulation -- Analysis ,Aerospace and defense industries ,Business ,Computers ,Electronics ,Electronics and electrical industries - Abstract
A new method for steady-state analysis of pulsewidth modulation (PWM) hard-switching dc-to-dc regulators is presented. The power stage and the feedback control circuit are analyzed as two interconnected blocks. The intersection of their open-loop dc steady-state characteristics with the ramp voltage provides a guess candidate steady-state solution (CS). An iterative process is used to validate it as true steady-state solution (TS) when the bias conditions of switching devices (SDs) are fulfilled everywhere in the switching period.
- Published
- 2003
12. Unified analysis of synchronous commutations in switching converters
- Author
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Femia, Nicola, Spagnuolo, Giovanni, and Vitelli, Massimo
- Subjects
Electric circuits -- Research ,Electric current converters -- Research ,Commutation (Electricity) -- Research ,Business ,Computers and office automation industries ,Electronics ,Electronics and electrical industries - Abstract
The analysis of synchronous commutations in switching converters is discussed in this paper. The Compensation Theorem (CT) is applied in order to define two matrices, called respectively zero-order and first-order master-slave connection matrix (Z-MSCM, F-MSCM), which allow a unified analysis of both hard and soft synchronous commutations in switching converters. The Z-MSCM and F-MSCM provide the analytical basis for studying the interactions among switching devices in any type of switching converter. The method is presented in its general formulation, valid for the analysis of switching converters including feedback circuitry and soft-switching cells. The examples presented show that the CT-based analysis of commutations is a useful and efficient tool for the comprehension of the mechanisms of synchronous commutations in switching converters and for numerical simulations. Index Terms--Compensation theorem, switching converters, synchronous commutations.
- Published
- 2002
13. Steady-state analysis of soft-switching converters
- Author
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Femia, Nicola, Spagnuolo, Giovanni, and Vitelli, Massimo
- Subjects
Frequency converters -- Research ,Business ,Computers and office automation industries ,Electronics ,Electronics and electrical industries - Abstract
Steady-state analysis of soft-switching converters is discussed in this paper. Finding the steady-state solution of soft-switching converters by means of start-up transient simulation may involve onerous computations and convergence failure, because of the mix of fast and slow natural frequencies determined respectively by the presence of soft-switching Lr-Cr cells elements and bulky L-C filter elements. The numerical method proposed in this paper shows high reliability and fast convergence, thanks to the adoption of an interval analysis based technique for the detection of commutations and of a compensation theorem based technique for the analysis of commutations. Some examples of steady-state analysis of two dc-dc converters, an inverter and a power factor corrector are presented to highlight the good performances of the simulation algorithm. Index Terms--Compensation theorem, interval analysis, soft-switching converters, steady-state analysis.
- Published
- 2002
14. State-space models and order reduction for DC-DC switching converters in discontinuous modes
- Author
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Femia, Nicola, Spagnuolo, Giovanni, and Tucci, Vincenzo
- Subjects
Electric current converters -- Research ,Discrete-time systems -- Research ,Power electronics -- Research ,Switching theory -- Research ,Business ,Electronics ,Electronics and electrical industries - Abstract
The state-space modeling and related order reduction problems of switching dc-dc converters operating in discontinuous (D) mode are treated in this paper. A unified discrete-time full-order model is proposed assuming the discontinuous current and voltage mode (DCVM) as a general operation mode from which the discontinuous current mode (DCM), the discontinuous voltage mode (DVM), and continuous mode (CM) derive as special cases. Such model permits a straightforward study of the control-to-output response, in each operation mode. The order reduction of the transfer function is carried out by means of the principal component analysis considering the joint controllability and observability properties of the circuit. It is shown that a proper order reduction can be gained not only in DC mode, as expected, but also in DV and DCV modes. A substantial difference between DC and DV modes is also evidenced in terms of controllability. The frequency analysis and state-space model order reduction for a Cuk converter are proposed to show that the method is free of the limitations affecting other methods of analysis and that its predictions fit experimental measurements.
- Published
- 1995
15. True Worst-Case Circuit Tolerance Analysis Using Genetic Algorithms and Affine Arithmetic
- Author
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Femia, Nicola and Spagnuolo, Giovanni
- Subjects
Tolerance (Engineering) -- Analysis ,Genetic algorithms -- Usage ,Stochastic approximation -- Usage ,Business ,Computers and office automation industries ,Electronics ,Electronics and electrical industries - Abstract
In this paper, a new approach to the calculation of the true worst case in circuit tolerance analysis (TWC-CTA) with parameters characterized by large uncertainties is presented. It is based on the joint use of genetic algorithms (GAs) and affine arithmetic (AA). The GAs are used to minimize the underestimation error which affects stochastic methods while the AA is applied to minimize the overestimation error which affects interval arithmetic methods in TWC-CTA problems. The joint GA-AA approach presented in this paper ensures a reliable TWC evaluation. Index Terms--Affine arithmetic, circuit tolerance analysis, genetic algorithms, interval arithmetic.
- Published
- 2000
16. Genetic Optimization of Interval Arithmetic-Based Worst Case Circuit Tolerance Analysis
- Author
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Femia, Nicola and Spagnuolo, Giovanni
- Subjects
Electric circuits -- Research ,Signal processing -- Research ,Genetic algorithms -- Research ,Business ,Computers and office automation industries ,Electronics ,Electronics and electrical industries - Abstract
A new approach for improving the efficiency and accuracy of interval arithmetic (IA) based worst case (WC) circuit tolerance analysis (TA) is presented in this paper. The partitioning of the parameters' tolerance/uncertainty ranges, which is necessary to increase the accuracy of IA-based computations, is optimized by means of a genetic algorithm (GA). It is shown that the IA-GA approach permits us to solve problems of small-change (SC) as well as large-change (LC) WC circuit TA, accurately and reliably. Several applications to the analysis of circuits with uncertain parameters are presented and discussed. Index Terms--Circuit tolerance analysis, genetic algorithms, interval arithmetic.
- Published
- 1999
17. Dual-Kalman-Filter-Based Identification and Real-Time Optimization of PV Systems
- Author
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Patrizio Manganiello, Giovanni Petrone, Giovanni Spagnuolo, Mattia Ricco, Eric Monmasson, Università degli Studi di Salerno (UNISA), Systèmes et Applications des Technologies de l'Information et de l'Energie (SATIE), École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-École normale supérieure - Rennes (ENS Rennes)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Conservatoire National des Arts et Métiers [CNAM] (CNAM)-Centre National de la Recherche Scientifique (CNRS), Manganiello, Patrizio, Ricco, Mattia, Petrone, Giovanni, Monmasson, Eric, and Spagnuolo, Giovanni
- Subjects
Optimization ,field programmable gate array ,Engineering ,dual Kalman filter ,optimisation ,Covariance matrices ,Settling time ,power system parameter estimation ,DC-DC converter ,battery-DC bus ,dual-Kalman filter-based identification ,7. Clean energy ,photovoltaic system parameter identification ,[SPI]Engineering Sciences [physics] ,Extended Kalman filter ,Mathematical model ,Control theory ,Gate array ,Electronic engineering ,PV system real-time optimization ,Electrical and Electronic Engineering ,real-time optimization ,Real-time systems ,ComputingMilieux_MISCELLANEOUS ,field programmable gate arrays ,DC/DCconverters ,system identification ,photovoltaic power systems ,real-timeoptimization ,business.industry ,Photovoltaic system ,System identification ,maximum power point trackers ,Computer Science Applications1707 Computer Vision and Pattern Recognition ,Kalman filter ,DC-BUS ,Power optimizer ,photovoltaic system ,Kalman filters ,perturbative maximum power point tracking algorithm ,Estimation ,Noise ,photovoltaic systems ,Control and Systems Engineering ,business - Abstract
In this paper, the use of the Dual Kalman Filter for the identification of photovoltaic system parameters is presented. The system includes the photovoltaic source, the dc/dc converter and the battery/dc bus and both its states and parameters in the actual operating conditions are identified. In particular, the proposed approach gives the confidence interval for the system settling time, which is used for the real-time optimization of the perturbative maximum power point tracking algorithm. The proposed technique is implemented by using a Field-Programmable Gate Array and it is validated by means of both simulation and experimental results.
- Published
- 2015
18. FPGA-Based Implementation of Dual Kalman Filter for PV MPPT Applications
- Author
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Mattia Ricco, Patrizio Manganiello, Giovanni Spagnuolo, Giovanni Petrone, Eric Monmasson, Ricco, Mattia, Manganiello, Patrizio, Monmasson, Eric, Petrone, Giovanni, Spagnuolo, Giovanni, Systèmes et Applications des Technologies de l'Information et de l'Energie (SATIE), École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-École normale supérieure - Rennes (ENS Rennes)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Conservatoire National des Arts et Métiers [CNAM] (CNAM)-Centre National de la Recherche Scientifique (CNRS), and Università degli Studi di Salerno (UNISA)
- Subjects
Engineering ,Settling time ,020209 energy ,02 engineering and technology ,Information System ,7. Clean energy ,Maximum power point tracking ,[SPI]Engineering Sciences [physics] ,dual Kalman filter (DKF) ,0202 electrical engineering, electronic engineering, information engineering ,Electronic engineering ,Electrical and Electronic Engineering ,Field-programmable gate array ,ComputingMilieux_MISCELLANEOUS ,Operating point ,Adaptive algorithm ,business.industry ,020208 electrical & electronic engineering ,Photovoltaic system ,Computer Science Applications1707 Computer Vision and Pattern Recognition ,Kalman filter ,Adaptive maximum power point tracking (MPPT) controller ,Computer Science Applications ,field programmable gate array (FPGA) ,Control and Systems Engineering ,Algorithm design ,business ,photovoltaic (PV) system ,Information Systems - Abstract
The way of implementing an adaptive maximum power point tracking algorithm for photovoltaic (PV) applications in a field programmable gate array (FPGA) is described in this paper. A dual Kalman filter allows estimating the settling time of the whole system, including the PV source and the dc/dc converter controlling the operating point thereof, so that the tracking algorithm self adapts its parameters to the actual weather conditions. The real-time identification need of this application requires an FPGA platform, so that the intrinsic algorithm parallelism is exploited and the execution time is reduced. The tradeoff solutions proposed in this paper, accounting for the algorithm complexity and the limited FPGA hardware, as well as some solutions for optimizing the implementation are described. The proposed adaptive algorithm is implemented in a low-cost Xilinx Spartan-6 FPGA and it is validated through experimental tests.
- Published
- 2017
19. FPGA-based implementation of an adaptive P&O MPPT controller for PV applications
- Author
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Patrizio Manganiello, Giovanni Petrone, Mattia Ricco, Giovanni Spagnuolo, Eric Monmasson, Università degli Studi di Salerno (UNISA), Systèmes et Applications des Technologies de l'Information et de l'Energie (SATIE), École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-École normale supérieure - Rennes (ENS Rennes)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Conservatoire National des Arts et Métiers [CNAM] (CNAM)-Centre National de la Recherche Scientifique (CNRS), Ricco, Mattia, Manganiello, Patrizio, Petrone, Giovanni, Monmasson, Eric, and Spagnuolo, Giovanni
- Subjects
Engineering ,business.industry ,Mppt controller ,Photovoltaic system ,Maximum power point tracking controller ,7. Clean energy ,Maximum power point tracking ,[SPI]Engineering Sciences [physics] ,Control and Systems Engineering ,Electronic engineering ,Electrical and Electronic Engineering ,business ,Field-programmable gate array ,ComputingMilieux_MISCELLANEOUS - Abstract
The aim of this paper is to present a Field Programmable Gate Array (FPGA) implementation of an adaptive perturb and observe (P&O) maximum power point tracking controller for photovoltaic application. The implemented controller is able to adapt the perturbation period of the P&O algorithm in order to face the changing environment conditions as well the aging of the photovoltaic system. The proposed implementation allows significantly improving the timing performances and reducing the FPGA resources. A complete time/area performance analysis and the experimental results confirm the feasibility and the efficiency of the proposed controller implementation. © 2014 IEEE.
- Published
- 2014
20. On-line optimization of the P&O MPPT method by means of the system identification
- Author
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Giovanni Petrone, Eric Monmasson, Mattia Ricco, Patrizio Manganiello, Giovanni Spagnuolo, Systèmes et Applications des Technologies de l'Information et de l'Energie (SATIE), École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-École normale supérieure - Rennes (ENS Rennes)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Conservatoire National des Arts et Métiers [CNAM] (CNAM)-Centre National de la Recherche Scientifique (CNRS), Università degli Studi di Salerno (UNISA), Manganiello, Patrizio, Ricco, Mattia, Monmasson, Eric, Petrone, Giovanni, and Spagnuolo, Giovanni
- Subjects
Operating point ,Frequency response ,Engineering ,Maximum power principle ,business.industry ,020209 energy ,020208 electrical & electronic engineering ,Photovoltaic system ,System identification ,02 engineering and technology ,7. Clean energy ,Maximum power point tracking ,Power optimizer ,[SPI]Engineering Sciences [physics] ,Control theory ,Control and Systems Engineering ,0202 electrical engineering, electronic engineering, information engineering ,Electronic engineering ,Electrical and Electronic Engineering ,MATLAB ,business ,computer ,ComputingMilieux_MISCELLANEOUS ,computer.programming_language - Abstract
One of the main functions any photovoltaic system is equipped with is the maximum power point tracking. The perturb and observe technique is one of the mainly used algorithms for tracking the optimal operating point of the photovoltaic source. Its performances depend on the values of the two design parameters, that are the amplitude and the frequency of the perturbations it applies for identifying the position of the maximum power point. In this paper, two methods for an on-line optimization of the perturbation period are presented. They are based on the identification of the dc/dc converter, that controls the photovoltaic source, by means of its impulse and frequency response, both evaluated by using the cross-correlation method. Such methods, as well as the tracking algorithm, are effectively implemented by using a Field Programmable Gate Array. The feasibility of the proposed methods has been confirmed by Matlab simulations. © 2013 IEEE.
- Published
- 2013
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