Maximum power transfer from a nonlinear energy source to an arbitrary load

Singer, S.; Braunstein, A.

doi:10.1049/ip-c.1987.0044

Cited by 14 publications

(10 citation statements)

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“…which define a DC ideal transformer. The DC load can be modeled by means of the following function v =f(i) V = fo(i) = VB +RLi (2) with VB> OandRL> 0. which corresponds to the Thevenin equivalent of the usual DC loads supplied by a PV generator. Namely, storage batteries, permanent magnet DC motor, shunt DC motor, electrolysis pool, etc.…”

Section: Impedance Matching By Means Of a DC Power Transformermentioning

confidence: 99%

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DC Power Gyrator versus DC Power Transformer for Impedance Matching of a PV Array

Cid-Pastor

Martínez-Salamero

Alonso

et al. 2006

2006 12th International Power Electronics and Motion Control Conference

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A comparative analysis between a DC power transformer and a DC power gyrator on equal bases of operation is presented. Both approaches are used to solve the problem of maximum power transference from a PV panel to a DC load. An outdoor measurements system has been implemented and comparative experiments have been carried out during six hours. Results show that both approaches are practically equivalent in terms of efficiency.

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Section: Impedance Matching By Means Of a DC Power Transformermentioning

confidence: 99%

“…The problem of finding the most appropriate power interface is discussed next. The main antecedents in the study of matching power interfaces can be found in the works of Singer and Braunstein on the coupling of a PV array and a dc load by means of a dc transformer with variable transformer ratio [1]- [2].…”

Section: Introductionmentioning

confidence: 99%

DC Power Gyrator versus DC Power Transformer for Impedance Matching of a PV Array

Cid-Pastor

Martínez-Salamero

Alonso

et al. 2006

2006 12th International Power Electronics and Motion Control Conference

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“…4 we clearly note that the load line of the field winding, if directly connected to the field array, intersects the V-I characteristics of the array at a voltage close to the open circuit voltage resulting in a very small field current and hence weak motor flux. This is mainly because of the large impedance of the field winding, Rf in equation (8). The negative effect of a weak flux on the motor performance is apparent from equations (7) and (9) namely poor torque and small mechanical output.…”

Section: <22> Motor Characteristicsmentioning

confidence: 99%

“…Impedance Matching DC-DC Converter DC-DC converters (or choppers) can be used as time variable impedance matching transformers to ensure that the load seen by the PV arrays always coincide with their MPOP [8]. In our design we adopted stepping up choppers as DC transformers that can match the arrays optimum impedances by changing their switching duty ratios as can be explained by referring to the basic step-up chopper circuit shown in Fig.…”

Section: <22> Motor Characteristicsmentioning

confidence: 99%

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Maximum Photovoltaic Power Flow to a Separately Excited DC Motor.

et al. 1995

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In this paper the authors have designed an experimental system to optimize the matching of a separately excited DCmotor interfaced to two PV arrays. Special emphasis has been placed on matching the load line of the field winding which, if directly connected to the PV array, intersects the V-I characteristics of the array at a voltage close to the open circuit voltage resulting in a very small excitation current and hence poor motor performance.Step-up choppers were used as impedance transformers to match the load lines of the field and armature windings to the maximum power lines of the PV arrays. The motor was coupled to a brake torque meter acting as a mechanical load and the step-up choppers were PWM controlled by a personal computer. The system efficiency defined as the ratio between the motor output mechanical power (calculated using the motor torque and speed) to the input power available from the PV arrays, was evaluated for four control modes as follows : applying no control, controlling only the armature winding, controlling only the field winding, and controlling both windings. The importance of controlling the field winding was clearly illustrated whereas controlling only the armature winding didn't significantly improve the system efficiency and this was because most of the input power was wasted in the form of heat in the armature winding due to the poor field excitation.

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A novel method to optimize photovoltaic generator operation

Zerhouni

Zegrar

Stambouli

et al. 2008

Int. J. Energy Res.

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SUMMARYPhotovoltaic (PV) energy is an alternative energy source for the future due to the world's limited energy resources. In this paper, a new technique to improve the performance of a PV array is presented. The study is based on the determination of the optimal configuration of a PV generator for a fixed number of modules. The aim of the study is to extract the maximum power from a PV generator connected in a direct coupling to a load. Different considerations (commutation current alone, commutation voltage alone, commutation current and voltage) are described. The presented method is based on microcontroller utilization. Very simple calculations allowed to decide, in real time, which configuration is appropriate for any load and any work conditions. Theoretical and experimental results are included. The effectiveness of the applied method is assessed by simulations and experiments. The method using commutation current and commutation voltage leads to good results unlike the other techniques.

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Maximum power transfer from a nonlinear energy source to an arbitrary load

Cited by 14 publications

References 0 publications

DC Power Gyrator versus DC Power Transformer for Impedance Matching of a PV Array

DC Power Gyrator versus DC Power Transformer for Impedance Matching of a PV Array

Maximum Photovoltaic Power Flow to a Separately Excited DC Motor.

A novel method to optimize photovoltaic generator operation

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