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Enrico Santi - One of the best experts on this subject based on the ideXlab platform.

  • parameter extraction procedure for a physics based power sic schottky Diode Model
    IEEE Transactions on Industry Applications, 2014
    Co-Authors: Alexander Grekov, Kang Peng, Enrico Santi
    Abstract:

    A detailed parameter extraction procedure for a simple physics-based power silicon carbide (SiC) Schottky Diode Model is presented. The developed procedure includes the extraction of carrier concentration, active area, and thickness of the drift region, which are needed in the power Schottky Diode Model. The main advantage is that the developed procedure does not require any knowledge of device fabrication, which is usually not available to circuit designers. The only measurements required for the parameter extraction are simple static I-V characterization and C-V measurements. Furthermore, the physics-based SiC Schottky Diode Model whose parameters are extracted by the proposed procedure includes temperature dependences and is generally applicable to SiC Schottky Diodes. The procedure is demonstrated for five Schottky Diodes from two different manufacturers having the following ratings: 600 V/50 A, 1.2 kV/3 A, 1.2 kV/7 A, 1.2 kV/20 A, and 600 V/4 A.

  • parameter extraction procedure for a physics based power sic schottky Diode Model
    Applied Power Electronics Conference, 2013
    Co-Authors: Alexander Grekov, Kang Peng, Enrico Santi
    Abstract:

    A detailed parameter extraction procedure for a simple physics-based power SiC Schottky Diode Model is presented. The developed procedure includes the extraction of doping concentration, active area and thickness of drift region, which are needed in the power Schottky Diode Model. The main advantage is that the developed procedure does not require any knowledge of device fabrication, which is usually not available to circuit designers. The only measurements required for the parameter extraction are a simple static I-V characterization and C-V measurements. Furthermore, the physics-based SiC Schottky Diode Model whose parameters are extracted by the proposed procedure includes temperature dependencies and is generally applicable to SiC Schottky Diodes. The procedure is demonstrated for four Schottky Diodes from two different manufacturers having the following ratings: 600V/50A, 1.2kV/3A, 1.2kV/7A, and 1.2kV/20A.

  • physical Modeling of fast p i n Diodes with carrier lifetime zoning part i device Model
    IEEE Transactions on Power Electronics, 2008
    Co-Authors: A T Bryant, Enrico Santi, P R Palmer, L Lu, J L Hudgins
    Abstract:

    This paper presents the development and implementation of a physics-based Diode Model which can simulate aspects of high-voltage Diodes such as snappy recovery during punch-through and the modified carrier density profile due to local lifetime control. It uses a Fourier series solution for the ambipolar diffusion equation in the lightly doped base region. The Model is compared with finite-element device simulations. A parameter extraction procedure for the Diode with lifetime control is proposed in Part II.

  • physical Modeling of fast p i n Diodes with carrier lifetime zoning part ii parameter extraction
    IEEE Transactions on Power Electronics, 2008
    Co-Authors: L Lu, Enrico Santi, P R Palmer, Angus Toby Bryant, J L Hudgins
    Abstract:

    In this paper, a parameter extraction procedure for high-voltage Diodes with local lifetime control is proposed. It is designed for use with the physics-based Diode Model described in Part I, which is capable of simulating Diodes with local lifetime control. The parameter extraction procedure described requires a forward characteristic and a reverse recovery measurement. The parameter extraction procedure is illustrated using finite-element simulations. The physics-based Model using the parameters extracted is then compared with experimental results.

  • a compact Diode Model for the simulation of fast power Diodes including the effects of avalanche and carrier lifetime zoning
    Power Electronics Specialists Conference, 2005
    Co-Authors: A T Bryant, Enrico Santi, P R Palmer, J L Hudgins
    Abstract:

    This paper presents the development and implementation of a compact Diode Model which can simulate aspects of high-voltage Diodes such as snappy recovery during punch-through and the modified carrier density profile due to local lifetime control. It can be used in both circuit simulators and the formal optimisation of devices and circuits. A Fourier-based solution is used to solve the ambipolar diffusion equation (ADE) and describe the carrier dynamics. The Model is shown to capture the required aspects of high-voltage Diode recovery successfully, including the use of local lifetime control to eliminate snappy recovery

Kashif Ishaque - One of the best experts on this subject based on the ideXlab platform.

  • an accurate and fast computational algorithm for the two Diode Model of pv module based on a hybrid method
    IEEE Transactions on Industrial Electronics, 2017
    Co-Authors: Vun Jack Chin, Zainal Salam, Kashif Ishaque
    Abstract:

    This paper proposes an improved hybrid method to compute the parameters of the two-Diode Model of photovoltaic (PV) module. Unlike previous methods, it attains the speed of the analytical approach by utilizing only datasheet information. Furthermore, its accuracy is not compromised as it does not require simplifications in its computation. Four parameters are determined analytically, while the remaining three are optimized by using an evolutionary algorithm, i.e., the differential evolution. The speed is improved because the parameters are optimized only once, i.e., at standard test condition, while the values at other conditions are computed analytically. Furthermore, a procedure to guide the initial conditions of the Newton–Raphson iteration is introduced. For validation, the algorithm is compared to other established computational methods for mono-, polycrystalline, and thin film modules. When evaluated against the experimental data, the mean absolute error is improved by one order of magnitude, while the speed is increased by approximately threefold. The standard deviation of the decision parameters over 100 independent runs is less than 0.1—which suggests that the optimization process is very consistent. Due to its speed and accuracy, the method is envisaged to be useful as a computational engine in PV simulator.

  • An accurate Modelling of the two-Diode Model of PV module using a hybrid solution based on differential evolution
    Energy Conversion and Management, 2016
    Co-Authors: Vun Jack Chin, Zainal Salam, Kashif Ishaque
    Abstract:

    This paper proposes an accurate computational technique for the two-Diode Model of PV module. Unlike previous methods, it does not rely on assumptions that cause the accuracy to be compromised. The key to this improvement is the implementation of a hybrid solution, i.e. by incorporating the analytical method with the differential evolution (DE) optimization technique. Three parameters, i.e. IPV, Io1, and Rp are computed analytically, while the remaining, a1, a2, Io2 and Rs are optimized using the DE. To validate its accuracy, the proposed method is tested on three PV modules of different technologies: mono-crystalline, poly-crystalline and thin film. Furthermore, its performance is evaluated against two popular computational methods for the two-Diode Model. The proposed method is found to exhibit superior accuracy for the variation in irradiance and temperature for all module types. In particular, the improvement in accuracy is evident at low irradiance conditions; the root-mean-square error is one order of magnitude lower than that of the other methods. In addition, the values of the Model parameters are consistent with the physics of PV cell. It is envisaged that the method can be very useful for PV simulation, in which accuracy of the Model is of prime concern.

  • a comprehensive matlab simulink pv system simulator with partial shading capability based on two Diode Model
    Solar Energy, 2011
    Co-Authors: Kashif Ishaque, Zainal Salam
    Abstract:

    Abstract This paper proposes a comprehensive MATLAB Simulink simulator for photovoltaic (PV) system. The simulator utilizes a new two-Diode Model to represent the PV cell. This Model is known to have better accuracy at low irradiance level that allows for a more accurate prediction of PV system performance during partial shading condition. To reduce computational time, only four parameters are extracted for the Model. The values of R p and R s are computed by an efficient iteration method. Furthermore, all the inputs to the simulators are information available on standard PV module datasheet. The simulator supports a large array combination that can be interfaced to MPPT algorithms and power electronic converters. The accurateness of the simulator is verified by applying the Model to five PV modules of different types (multi-crystalline, mono-crystalline, and thin-film) from various manufacturers. It is envisaged that the proposed work can be very useful for PV professionals who require simple, fast, and accurate PV simulator to design their systems. The developed simulator is freely available for download.

  • Modeling and simulation of photovoltaic pv system during partial shading based on a two Diode Model
    Simulation Modelling Practice and Theory, 2011
    Co-Authors: Kashif Ishaque, Zainal Salam, Hamed Taheri
    Abstract:

    This paper proposes accurate partial shading Modeling of photovoltaic (PV) system. The main contribution of this work is the utilization of the two-Diode Model to represent the PV cell. This Model requires only four parameters and known to have better accuracy at low irradiance level, allowing for more accurate prediction of PV system performance during partial shading condition. The proposed Model supports a large array simulation that can be interfaced with MPPT algorithms and power electronic converters. The accurateness of the Modeling technique is validated by real time simulator data and compared with the three other types of Modeling, namely Neural Network, P&O and single-Diode Model. It is envisaged that the proposed work is very useful for PV professionals who require simple, fast and accurate PV Model to design their systems.

  • accurate matlab simulink pv system simulator based on a two Diode Model
    Journal of Power Electronics, 2011
    Co-Authors: Kashif Ishaque, Zainal Salam, Hamed Taheri
    Abstract:

    This paper proposes a MATLAB Simulink simulator for photovoltaic (PV) systems. The main contribution of this work is the utilization of a two-Diode Model to represent a PV cell. This Model is known to have better accuracy at low irradiance levels which allows for a more accurate prediction of PV system performance. To reduce computational time, the input parameters are reduced to four and the values of Rp and Rs are estimated by an efficient iteration method. Furthermore, all of the inputs to the simulator are information available on a standard PV module datasheet. The simulator supports large array simulations that can be interfaced with MPPT algorithms and power electronic converters. The accuracy of the simulator is verified by applying the Model to five PV modules of different types (multi-crystalline, mono-crystalline, and thin-film) from various manufacturers. It is envisaged that the proposed work can be very useful for PV professionals who require a simple, fast and accurate PV simulator to design their systems.

O Breitenstein - One of the best experts on this subject based on the ideXlab platform.

  • an alternative one Diode Model for illuminated solar cells
    IEEE Journal of Photovoltaics, 2014
    Co-Authors: O Breitenstein
    Abstract:

    A novel one-Diode Model is proposed for illuminated solar cells, which contains an additional variable resistance describing minority carrier diffusion from the bulk to the p-n junction. This Model naturally describes the differences between photo- and electroluminescence imaging, as well as a well-known departure from the superposition principle.

  • an alternative one Diode Model for illuminated solar cells
    Energy Procedia, 2014
    Co-Authors: O Breitenstein
    Abstract:

    Abstract A novel one-Diode Model is proposed for illuminated solar cells, which contains an additional variable resistance describing minority carrier diffusion from the bulk to the p-n junction. This Model naturally describes the differences between photo- and electroluminescence imaging without the need for correcting the photoluminescence images by short circuit images. It was successfully applied to the quantitative interpretation of photoluminescence images of an industrial multicrystalline silicon cell, where it provides a realistic prediction of the local short circuit current density. Moreover, the novel Model explains a known departure from the superposition principle.

  • a two Diode Model regarding the distributed series resistance
    Solar Energy Materials and Solar Cells, 2013
    Co-Authors: O Breitenstein, Sven Risland
    Abstract:

    The two-Diode Model is widespread for interpreting dark and illuminated current–voltage characteristics of solar cells, though it does not hold correctly for high current densities due to the distributed character of the series resistance. This is one reason for the fact that fitting the dark and the illuminated characteristic leads to two different sets of two-Diode parameters. After locally analyzing a typical multicrystalline solar cell, it is found that here the grid conductivity represents the most significant contribution to the distributed series resistance. A simplified equivalent circuit implying a 1-dimensional current distribution is used for simulating current-dependent effective (lumped) series resistances in the dark and under illumination. It is found that the influence of the distributed series resistance on both characteristics can be described empirically by introducing a series resistance being variable for high currents. Moreover, well-known departures from the superposition principle often cannot be neglected. Therefore the second Diode contribution is generally stronger under illumination than in the dark, and also the parallel resistance may be affected. We introduce only one additional series resistance parameter and consider that the second Diode parameters and the parallel resistance may be different under illumination and in the dark. In this way, the current dependence of both the dark and the illuminated series resistance can be described with the same consistent set of first Diode and series resistance parameters. Based on these findings, a two-Diode Model with an analytically given variable series resistance is proposed, which may describe both the dark and the illuminated characteristic up to large current densities in good approximation with one and the same physically meaningful parameter set.

  • considering the distributed series resistance in a two Diode Model
    Energy Procedia, 2013
    Co-Authors: Sven Risland, O Breitenstein
    Abstract:

    Abstract The interpretation of the global current-voltage (I-V) characteristic of solar cells is usually based on the two-Diode Model, which regards a homogeneous current flow. Due to the distributed character of the series resistance this assumption does not hold for high current densities and leads, beside some other well-known departures from the superposition principle, to two different sets of two-Diode parameters describing the recombination and series resistance effects in the dark and under illumination. In this contribution a 1-dimensional Model is used for the evaluation of the spatial current distribution and results in a current-dependent effective (lumped) series resistance for the different cases of illumination, which is described empirically. By introducing just one additional series resistance parameter it is possible to characterize the dark and the illuminated I-V curve with one physically meaningful set of first Diode and series resistance parameters. However the second Diode parameters as well as the parallel resistance might be influenced by other departures from the superposition principle. Considering this results, we propose a two- Diode Model with an analytically given current-dependent series resistance, which may describe the dark as well as the illuminated I-V characteristic up to large current densities based on one and the same parameter set. This approach is applied to two different solar cells.

Zainal Salam - One of the best experts on this subject based on the ideXlab platform.

  • an accurate and fast computational algorithm for the two Diode Model of pv module based on a hybrid method
    IEEE Transactions on Industrial Electronics, 2017
    Co-Authors: Vun Jack Chin, Zainal Salam, Kashif Ishaque
    Abstract:

    This paper proposes an improved hybrid method to compute the parameters of the two-Diode Model of photovoltaic (PV) module. Unlike previous methods, it attains the speed of the analytical approach by utilizing only datasheet information. Furthermore, its accuracy is not compromised as it does not require simplifications in its computation. Four parameters are determined analytically, while the remaining three are optimized by using an evolutionary algorithm, i.e., the differential evolution. The speed is improved because the parameters are optimized only once, i.e., at standard test condition, while the values at other conditions are computed analytically. Furthermore, a procedure to guide the initial conditions of the Newton–Raphson iteration is introduced. For validation, the algorithm is compared to other established computational methods for mono-, polycrystalline, and thin film modules. When evaluated against the experimental data, the mean absolute error is improved by one order of magnitude, while the speed is increased by approximately threefold. The standard deviation of the decision parameters over 100 independent runs is less than 0.1—which suggests that the optimization process is very consistent. Due to its speed and accuracy, the method is envisaged to be useful as a computational engine in PV simulator.

  • An accurate Modelling of the two-Diode Model of PV module using a hybrid solution based on differential evolution
    Energy Conversion and Management, 2016
    Co-Authors: Vun Jack Chin, Zainal Salam, Kashif Ishaque
    Abstract:

    This paper proposes an accurate computational technique for the two-Diode Model of PV module. Unlike previous methods, it does not rely on assumptions that cause the accuracy to be compromised. The key to this improvement is the implementation of a hybrid solution, i.e. by incorporating the analytical method with the differential evolution (DE) optimization technique. Three parameters, i.e. IPV, Io1, and Rp are computed analytically, while the remaining, a1, a2, Io2 and Rs are optimized using the DE. To validate its accuracy, the proposed method is tested on three PV modules of different technologies: mono-crystalline, poly-crystalline and thin film. Furthermore, its performance is evaluated against two popular computational methods for the two-Diode Model. The proposed method is found to exhibit superior accuracy for the variation in irradiance and temperature for all module types. In particular, the improvement in accuracy is evident at low irradiance conditions; the root-mean-square error is one order of magnitude lower than that of the other methods. In addition, the values of the Model parameters are consistent with the physics of PV cell. It is envisaged that the method can be very useful for PV simulation, in which accuracy of the Model is of prime concern.

  • a comprehensive matlab simulink pv system simulator with partial shading capability based on two Diode Model
    Solar Energy, 2011
    Co-Authors: Kashif Ishaque, Zainal Salam
    Abstract:

    Abstract This paper proposes a comprehensive MATLAB Simulink simulator for photovoltaic (PV) system. The simulator utilizes a new two-Diode Model to represent the PV cell. This Model is known to have better accuracy at low irradiance level that allows for a more accurate prediction of PV system performance during partial shading condition. To reduce computational time, only four parameters are extracted for the Model. The values of R p and R s are computed by an efficient iteration method. Furthermore, all the inputs to the simulators are information available on standard PV module datasheet. The simulator supports a large array combination that can be interfaced to MPPT algorithms and power electronic converters. The accurateness of the simulator is verified by applying the Model to five PV modules of different types (multi-crystalline, mono-crystalline, and thin-film) from various manufacturers. It is envisaged that the proposed work can be very useful for PV professionals who require simple, fast, and accurate PV simulator to design their systems. The developed simulator is freely available for download.

  • Modeling and simulation of photovoltaic pv system during partial shading based on a two Diode Model
    Simulation Modelling Practice and Theory, 2011
    Co-Authors: Kashif Ishaque, Zainal Salam, Hamed Taheri
    Abstract:

    This paper proposes accurate partial shading Modeling of photovoltaic (PV) system. The main contribution of this work is the utilization of the two-Diode Model to represent the PV cell. This Model requires only four parameters and known to have better accuracy at low irradiance level, allowing for more accurate prediction of PV system performance during partial shading condition. The proposed Model supports a large array simulation that can be interfaced with MPPT algorithms and power electronic converters. The accurateness of the Modeling technique is validated by real time simulator data and compared with the three other types of Modeling, namely Neural Network, P&O and single-Diode Model. It is envisaged that the proposed work is very useful for PV professionals who require simple, fast and accurate PV Model to design their systems.

  • accurate matlab simulink pv system simulator based on a two Diode Model
    Journal of Power Electronics, 2011
    Co-Authors: Kashif Ishaque, Zainal Salam, Hamed Taheri
    Abstract:

    This paper proposes a MATLAB Simulink simulator for photovoltaic (PV) systems. The main contribution of this work is the utilization of a two-Diode Model to represent a PV cell. This Model is known to have better accuracy at low irradiance levels which allows for a more accurate prediction of PV system performance. To reduce computational time, the input parameters are reduced to four and the values of Rp and Rs are estimated by an efficient iteration method. Furthermore, all of the inputs to the simulator are information available on a standard PV module datasheet. The simulator supports large array simulations that can be interfaced with MPPT algorithms and power electronic converters. The accuracy of the simulator is verified by applying the Model to five PV modules of different types (multi-crystalline, mono-crystalline, and thin-film) from various manufacturers. It is envisaged that the proposed work can be very useful for PV professionals who require a simple, fast and accurate PV simulator to design their systems.

Hamed Taheri - One of the best experts on this subject based on the ideXlab platform.

  • Modeling and simulation of photovoltaic pv system during partial shading based on a two Diode Model
    Simulation Modelling Practice and Theory, 2011
    Co-Authors: Kashif Ishaque, Zainal Salam, Hamed Taheri
    Abstract:

    This paper proposes accurate partial shading Modeling of photovoltaic (PV) system. The main contribution of this work is the utilization of the two-Diode Model to represent the PV cell. This Model requires only four parameters and known to have better accuracy at low irradiance level, allowing for more accurate prediction of PV system performance during partial shading condition. The proposed Model supports a large array simulation that can be interfaced with MPPT algorithms and power electronic converters. The accurateness of the Modeling technique is validated by real time simulator data and compared with the three other types of Modeling, namely Neural Network, P&O and single-Diode Model. It is envisaged that the proposed work is very useful for PV professionals who require simple, fast and accurate PV Model to design their systems.

  • accurate matlab simulink pv system simulator based on a two Diode Model
    Journal of Power Electronics, 2011
    Co-Authors: Kashif Ishaque, Zainal Salam, Hamed Taheri
    Abstract:

    This paper proposes a MATLAB Simulink simulator for photovoltaic (PV) systems. The main contribution of this work is the utilization of a two-Diode Model to represent a PV cell. This Model is known to have better accuracy at low irradiance levels which allows for a more accurate prediction of PV system performance. To reduce computational time, the input parameters are reduced to four and the values of Rp and Rs are estimated by an efficient iteration method. Furthermore, all of the inputs to the simulator are information available on a standard PV module datasheet. The simulator supports large array simulations that can be interfaced with MPPT algorithms and power electronic converters. The accuracy of the simulator is verified by applying the Model to five PV modules of different types (multi-crystalline, mono-crystalline, and thin-film) from various manufacturers. It is envisaged that the proposed work can be very useful for PV professionals who require a simple, fast and accurate PV simulator to design their systems.

  • simple fast and accurate two Diode Model for photovoltaic modules
    Solar Energy Materials and Solar Cells, 2011
    Co-Authors: Kashif Ishaque, Zainal Salam, Hamed Taheri
    Abstract:

    Abstract This paper proposes an improved Modeling approach for the two-Diode Model of photovoltaic (PV) module. The main contribution of this work is the simplification of the current equation, in which only four parameters are required, compared to six or more in the previously developed two-Diode Models. Furthermore the values of the series and parallel resistances are computed using a simple and fast iterative method. To validate the accuracy of the proposed Model, six PV modules of different types (multi-crystalline, mono-crystalline and thin-film) from various manufacturers are tested. The performance of the Model is evaluated against the popular single Diode Models. It is found that the proposed Model is superior when subjected to irradiance and temperature variations. In particular the Model matches very accurately for all important points of the I–V curves, i.e. the peak power, short-circuit current and open circuit voltage. The Modeling method is useful for PV power converter designers and circuit simulator developers who require simple, fast yet accurate Model for the PV module.