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Papers by doc doca
The electrical power available from a photovoltaic (PV) module can be simulated with the well-kno... more The electrical power available from a photovoltaic (PV) module can be simulated with the well-known and widely used [1-4] single diode equation. Five parameters must be known in the equation to determine the current voltage relationship (I-V curve) for the module. These parameters can be obtained by fitting the experimental I V curve at a fixed temperature and solar radiation for a small but representative sub-cell of the PV module. This is true because the single diode equation is invariant with respect to an arbitrary linear transformation in the I-V plane and there is a simple linear transformation between I-V curve of the module and I-V curve of its representative sub-cell. Of course, the five parameters are the functions of this transformation. Furthermore, the single diode equation for an array of the same PV modules can be represented as a linear transformation from the single module in I-V plane. The inverse problem to derive the coefficients of the matrix of this transformation can be defined from only two measurements:
This paper investigates the suitability of the equation below for accurately defining solar cell ... more This paper investigates the suitability of the equation below for accurately defining solar cell parameter degradation as a function of hard panicle radiation. Y = Y" + c, *Log(l +pip,)+ c, *Log(l +p/py) The paper uses the Lcvenberg-Marquardt method for determining the constants in the equation and compares predictions from the equation to those obtained by polynomial fits: m ,=0
This paper deals with the mathematical model to assess the performances of photovoltaic (PV) cell... more This paper deals with the mathematical model to assess the performances of photovoltaic (PV) cells. The PV system characteristics are modeled and analyzed by using the curve fitting method referred to the different connections of PV cells and different solar irradiance. The results are compared with those resulting from measured data in a real case. Specific LabVIEW TM and Matlab TM software applications are implemented to prove the theoretical methods.
This article suggests a simple method of modeling and simulation of photovoltaic systems. The mai... more This article suggests a simple method of modeling and simulation of photovoltaic systems. The main goal is to find the parameters ( Iph , Io , Rs , Rsh , and a) of the single-diode model by adjusting the P-V curve and/or I-V curve at parameters provided by the manufacturer specification sheets ( Isc , Voc , Imp , andVmp). An empirical model is incorporated into the single-diode model in order to remove its implicit nature and to ease the calculations.
This paper suggests a new and more direct procedure for selecting the motor type and magnetic par... more This paper suggests a new and more direct procedure for selecting the motor type and magnetic parameters yielding optimal matching with photovoltaic solar arrays. It is based on combining both the maximum power locus of the solar array and the motor's voltage-current characteristics, assuming a perfect match at all radiation levels. It will then be possible to derive the required (ideal) flux-current relationship of the DC motor. In other words, the matching problem will be reduced from the usual analysis in the voltage-current plane to the mapping of the motor's ideal magnetic characteristic on a new plane relating the motor flux and its armature current. From this curve, through the application of simple curve fitting, the appropriate type and magnetic parameters of the motor can then be easily determined. As will be seen from the different case studies, the results will depend on the solar array parameters, the motor's total armature circuit resistance, as well as on the torque-speed curve of the mechanical load.
This paper presents an improved indirect maximum power point tracking (MPPT) method for a standal... more This paper presents an improved indirect maximum power point tracking (MPPT) method for a standalone photovoltaic (PV) generation system. The proposed method is based on curve fitting for finding the best fit for the P-V characteristic curve by representing it in terms of a polynomial function of the fourth degree. The predicted P-V curve strongly depends on the cell temperature and therefore the ambient temperature and solar radiation are used to track the maximum power point (MPP) of the PV module. Experimental results are given to verify the validity and performance of the MPPT algorithm which is embedded in a prototype MPPT controller. The experimental results show that the proposed MPPT controller which is tested on a standalone PV system successfully tracked the MPP by giving an average tracking efficiency of 89.2%.
This paper presents an efficient maximum power point tracking (MPPT) controller for a standalone ... more This paper presents an efficient maximum power point tracking (MPPT) controller for a standalone photovoltaic (PV) generation system. To achieve an efficient MPPT controller, a new boost converter design and an improved MPPT algorithm are incorporated. In the proposed boost converter design, a passive regenerative snubber circuit is included to absorb the energy of stray inductance so as to reduce the IGBT switching losses. As for the improved MPPT algorithm, it is based on the curve fitting method which attempts to predict the power-voltage characteristic curve by a fourth order polynomial function. The predicted P-V curve strongly depends on the cell temperature and therefore the ambient temperature and solar radiation are used to track the maximum power point (MPP) of the PV module. Experimental results are given to verify the validity and performance of the MPPT algorithm which is embedded in a prototype MPPT controller. The experimental results showed that the proposed MPPT controller successfully tracked the MPP by giving an average tracking efficiency of 89.2%
N ature-I n s p i r e d M etaheu ri s t i c A lg or ithms S e c o n d E d itio n ( 2 0 1 0 ) Xin-... more N ature-I n s p i r e d M etaheu ri s t i c A lg or ithms S e c o n d E d itio n ( 2 0 1 0 ) Xin-She Yang
The electrical power available from a photovoltaic (PV) module can be simulated with the well-kno... more The electrical power available from a photovoltaic (PV) module can be simulated with the well-known and widely used [1-4] single diode equation. Five parameters must be known in the equation to determine the current voltage relationship (I-V curve) for the module. These parameters can be obtained by fitting the experimental I V curve at a fixed temperature and solar radiation for a small but representative sub-cell of the PV module. This is true because the single diode equation is invariant with respect to an arbitrary linear transformation in the I-V plane and there is a simple linear transformation between I-V curve of the module and I-V curve of its representative sub-cell. Of course, the five parameters are the functions of this transformation. Furthermore, the single diode equation for an array of the same PV modules can be represented as a linear transformation from the single module in I-V plane. The inverse problem to derive the coefficients of the matrix of this transformation can be defined from only two measurements:
This paper investigates the suitability of the equation below for accurately defining solar cell ... more This paper investigates the suitability of the equation below for accurately defining solar cell parameter degradation as a function of hard panicle radiation. Y = Y" + c, *Log(l +pip,)+ c, *Log(l +p/py) The paper uses the Lcvenberg-Marquardt method for determining the constants in the equation and compares predictions from the equation to those obtained by polynomial fits: m ,=0
This paper deals with the mathematical model to assess the performances of photovoltaic (PV) cell... more This paper deals with the mathematical model to assess the performances of photovoltaic (PV) cells. The PV system characteristics are modeled and analyzed by using the curve fitting method referred to the different connections of PV cells and different solar irradiance. The results are compared with those resulting from measured data in a real case. Specific LabVIEW TM and Matlab TM software applications are implemented to prove the theoretical methods.
This article suggests a simple method of modeling and simulation of photovoltaic systems. The mai... more This article suggests a simple method of modeling and simulation of photovoltaic systems. The main goal is to find the parameters ( Iph , Io , Rs , Rsh , and a) of the single-diode model by adjusting the P-V curve and/or I-V curve at parameters provided by the manufacturer specification sheets ( Isc , Voc , Imp , andVmp). An empirical model is incorporated into the single-diode model in order to remove its implicit nature and to ease the calculations.
This paper suggests a new and more direct procedure for selecting the motor type and magnetic par... more This paper suggests a new and more direct procedure for selecting the motor type and magnetic parameters yielding optimal matching with photovoltaic solar arrays. It is based on combining both the maximum power locus of the solar array and the motor's voltage-current characteristics, assuming a perfect match at all radiation levels. It will then be possible to derive the required (ideal) flux-current relationship of the DC motor. In other words, the matching problem will be reduced from the usual analysis in the voltage-current plane to the mapping of the motor's ideal magnetic characteristic on a new plane relating the motor flux and its armature current. From this curve, through the application of simple curve fitting, the appropriate type and magnetic parameters of the motor can then be easily determined. As will be seen from the different case studies, the results will depend on the solar array parameters, the motor's total armature circuit resistance, as well as on the torque-speed curve of the mechanical load.
This paper presents an improved indirect maximum power point tracking (MPPT) method for a standal... more This paper presents an improved indirect maximum power point tracking (MPPT) method for a standalone photovoltaic (PV) generation system. The proposed method is based on curve fitting for finding the best fit for the P-V characteristic curve by representing it in terms of a polynomial function of the fourth degree. The predicted P-V curve strongly depends on the cell temperature and therefore the ambient temperature and solar radiation are used to track the maximum power point (MPP) of the PV module. Experimental results are given to verify the validity and performance of the MPPT algorithm which is embedded in a prototype MPPT controller. The experimental results show that the proposed MPPT controller which is tested on a standalone PV system successfully tracked the MPP by giving an average tracking efficiency of 89.2%.
This paper presents an efficient maximum power point tracking (MPPT) controller for a standalone ... more This paper presents an efficient maximum power point tracking (MPPT) controller for a standalone photovoltaic (PV) generation system. To achieve an efficient MPPT controller, a new boost converter design and an improved MPPT algorithm are incorporated. In the proposed boost converter design, a passive regenerative snubber circuit is included to absorb the energy of stray inductance so as to reduce the IGBT switching losses. As for the improved MPPT algorithm, it is based on the curve fitting method which attempts to predict the power-voltage characteristic curve by a fourth order polynomial function. The predicted P-V curve strongly depends on the cell temperature and therefore the ambient temperature and solar radiation are used to track the maximum power point (MPP) of the PV module. Experimental results are given to verify the validity and performance of the MPPT algorithm which is embedded in a prototype MPPT controller. The experimental results showed that the proposed MPPT controller successfully tracked the MPP by giving an average tracking efficiency of 89.2%
N ature-I n s p i r e d M etaheu ri s t i c A lg or ithms S e c o n d E d itio n ( 2 0 1 0 ) Xin-... more N ature-I n s p i r e d M etaheu ri s t i c A lg or ithms S e c o n d E d itio n ( 2 0 1 0 ) Xin-She Yang