Slip Control of a Squirrel Cage Induction Generator Driven by an Electromagnetic Frequency Regulator to Achieve the Maximum Power Point Tracking

Ramos, Thales; Júnior, Manoel F. Medeiros; Pinheiro, Ricardo Ferreira; Medeiros, Arthur

doi:10.3390/en12112100

Cited by 14 publications

(31 citation statements)

References 18 publications

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“…|V pu is given for various values V pu = 1; 0.8; 0.6; 0.4 of the wind velocity [1,7,11,[13][14][15][16][17]. The black points indicate the maximum power P E of the turbine for a given wind velocity.…”

Section: Application Suggestionsmentioning

confidence: 99%

Voltage Control of Multiphase Cage Induction Generators at a Speed Varying over a Wide Range

Drozdowski

Cholewa

2021

Energies

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The subject of this publication is a method of controlling the DC voltage of a PWM rectifier supplied by a multiphase cage induction generator with the number of stator phases greater than three operating in a wide range of driving speeds. Voltage regulation is performed by changing the frequency and amplitude of the stator voltages with simultaneous switching of the phase sequence of these voltages. The step change of the voltage sequence is made in the designated ranges of the generator speed, which enables the stabilization of the output voltage in a wide range from the minimum speed of about 25% of the rated speed. Such sequence switching changes the number of pole pairs produced by the winding for each supply sequence. The difference compared to multi-speed induction machines is that, in the presented solution, there is only one winding, not a few, which enables good use of the machine’s magnetic core in the same dimensions as for the three-phase machine of a similar power. Steady-state characteristics and dynamic operation were obtained using laboratory measurements of a standalone nine-phase induction generator. The automatic control system maintained the output voltage at the set level, regardless of the generator load and driving power.

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Section: Application Suggestionsmentioning

confidence: 99%

Voltage Control of Multiphase Cage Induction Generators at a Speed Varying over a Wide Range

Drozdowski

Cholewa

2021

Energies

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“…The formulation by Ramos et al [14] uses the conventional slip: (1 − s 0 ) (P a + P i ) = P r + losses. By rewriting s 0 as a function of s, one can arrive at (19).…”

Section: The Electromagnetic Frequency Regulator -Efrmentioning

confidence: 99%

“…This paper proposes a way to extract wind energy using: (1) a hydrostatic transmission instead of the gearbox; (2) the EFR with the frequency inverter isolated from the grid; (3) separate controls for the motor and the inverter; and (4) the generator directly connected to the grid. This text, like the original proposal of the technology [10][11][12][13], makes reference to the synchronous generator, but the idea also applies to the induction model [14]. The system (cf.…”

Section: Introductionmentioning

confidence: 99%

Harnessing Wind Energy with Hydrostatic Transmission Coupled to an Electromagnetic Frequency Regulator

Asl¹,

Rf²,

Gi³

2020

Preprint

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This work presents an alternative to harnessing wind energy with an Electromagnetic Frequency Regulator (EFR) coupled to a hydrostatic transmission and associated with a horizontal axis wind turbine, a bidirectional frequency inverter and a secondary energy source, in a hybridized system. The hydrostatic transmision is composed by a fixed displacement axial piston pump and a variable displacement, swash plate, axial piston motor. Feedback linearization was used as a technique to control the motor geometric displacement, and a prediction algorithm for the steady state rotations of the armature and the electromagnetic field has been developed. A 5\,kW project was simulated on a Scilab platform, with combinations of constant or variable load, and constant or variable wind speed. The results indicated that the system was able to supply the generator load, adapting to fluctuations in wind speed. The possibility of storing wind energy through the inverter has also been proven. The system can accumulate energy in batteries during the fastest wind regimes, to use it when the turbine power is lower than the load.

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“…ZnPc exhibits π-conjugated structure and acts as a hole conducting material that works as electron donor [25]. Furthermore, it has served as a promising candidate in many electronic and optoelectronic devices [26]. ZnPc is a promising candidate for photovoltaic applications [27,28], owing to the fact that it can be easily synthesized, has broad absorption spectrum in the visible region and is non-toxic to the environment [29].…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Photovoltaic Properties of Organic Solar Cell Based on Zinc Phthalocyanine

et al. 2020

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Herein, we report thin films’ characterizations and photovoltaic properties of an organic semiconductor zinc phthalocyanine (ZnPc). To study the former, a 100 nm thick film of ZnPc is thermally deposited on quartz glass by using vacuum thermal evaporator at 1.5 × 10−6 mbar. Surface features of the ZnPc film are studied by using scanning electron microscope (SEM) with in situ energy dispersive x-ray spectroscopy (EDS) analysis and atomic force microscope (AFM) which reveal uniform film growth, grain sizes and shapes with slight random distribution of the grains. Ultraviolet-visible (UV-vis) and Fourier Transform Infrared (FTIR) spectroscopies are carried out of the ZnPc thin films to measure its optical bandgap (1.55 eV and 3.08 eV) as well as to study chemical composition and bond-dynamics. To explore photovoltaic properties of ZnPc, an Ag/ZnPc/PEDOT:PSS/ITO cell is fabricated by spin coating a 20 nm thick film of hole transport layer (HTL)—poly-(3,4-ethylenedioxythiophene) poly(styrene sulfonic acid) (PEDOT:PSS)—on indium tin oxide (ITO) substrate followed by thermal evaporation of a 100 nm layer of ZnPc and 50 nm silver (Ag) electrode. Current-voltage (I-V) properties of the fabricated device are measured in dark as well as under illumination at standard testing conditions (STC), i.e., 300 K, 100 mW/cm2 and 1.5 AM global by using solar simulator. The key device parameters such as ideality factor (n), barrier height ( ϕ b ), junction/interfacial resistance (Rs) and forward current rectification of the device are measured in the dark which exhibit the formation of depletion region. The Ag/ZnPc/PEDOT:PSS/ITO device demonstrates good photovoltaic characteristics by offering 0.48 fill factor (FF) and 1.28 ± 0.05% power conversion efficiency (PCE), η.

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Slip Control of a Squirrel Cage Induction Generator Driven by an Electromagnetic Frequency Regulator to Achieve the Maximum Power Point Tracking

Cited by 14 publications

References 18 publications

Voltage Control of Multiphase Cage Induction Generators at a Speed Varying over a Wide Range

Voltage Control of Multiphase Cage Induction Generators at a Speed Varying over a Wide Range

Harnessing Wind Energy with Hydrostatic Transmission Coupled to an Electromagnetic Frequency Regulator

Fabrication and Photovoltaic Properties of Organic Solar Cell Based on Zinc Phthalocyanine

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