Localized surface plasmon absorption features arise at high doping levels in semiconductor nanocrystals, appearing the near-infrared range. Here we show that plasmons of tin-doped indium oxide nanocrystal films can be dynamically and reversibly tuned by postsynthetic electrochemical modulation electron concentration. Without ion intercalation associated material degradation, induce a > 1200 nm shift wavelength factor nearly three change carrier density.

A switching control strategy to the power flow and minimize total losses of dual active bridge converter topology is proposed in this paper.The consists driving with largest dc voltage generate a three-level pulsewidth-modulated (PWM) waveform.This PWM ruled by two manipulated variables: phase shift between primary secondary transformer voltages modulation index.These variables are calculated using an algorithm that deduced on basis particular calculation analysis losses, which also...

A new modulation strategy that allows operating the dual active bridge (DAB) dc-dc converter under soft switching in whole range is proposed. This ruled by imposing a certain index one of two bridges and phase shift between transformer primary secondary voltages. Moreover, proposed algorithm reduces reactive power thus reducing conduction losses. An experimental prototype was implemented some results are presented to validate theoretical analysis. The reveal overall efficiency DAB topology...

The induction motor (IM) is a high-efficiency machine when working close to its rated operating point. However, at torques and/or speeds far from the values efficiency greatly reduced. In this work new approach proposed that minimizes total copper and iron losses in variable speed torque IM drive, while keeping good dynamic response. This method based on simple model includes losses. model, which only requires knowledge of conventional parameters, referred field-oriented frame. Using are...

In this paper, a model-based strategy for stator-interturn short-circuit detection on induction motors is presented. The proposed based the generation of vector specific residual using state observer. vectorial generated from decomposition current estimation error. This allows fast incipient faults, independently phase in which fault occurs. Since observer includes an adaptive scheme rotor-speed estimation, can be implemented online monitoring, by measuring only stator voltages and currents....

A plasmonic electrochromic effect in which electrochemical doping reversibly modulates near-infrared surface plasmon absorption of aluminium-doped zinc oxide and tin-doped indium nanocrystals is reported. Optical performance, switching kinetics, cycling durability point to high-performance NIR selective coatings based on earth-abundant materials.

Inevitable variations in size and composition within nanocrystal ensembles affect their optical absorbance as revealed by effective medium theory calculations. We critically analyzed the effects of such inhomogeneity surface ligands on localized plasmon resonance absorption In2O3:Sn Cu2–xSe dispersions. Modeling line shape readily provides valuable quantitative insight into structural, electrical, properties colloidal nanocrystals.

A switching control strategy to extend the soft-switching operating range of dual active bridge (DAB) dc-dc converter under zero-voltage-switching (ZVS) mode is proposed. The topology consists two bridges linked by a high-frequency transformer. One drawback this that only possible in restricted region. novel pulse width modulation conventional region and its analysis are presented paper. Experimental results given order validate theoretical practical feasibility proposed strategy.

A sensorless control strategy for a doubly fed (wound rotor) induction machine working in variable-speed stand-alone power systems without using mechanical sensors is presented this paper. Stator voltage magnitude and frequency are regulated two field-oriented loops. Luenberger observer used to estimate the stator flux, while an adaptive scheme modifies rotor position required flux estimation. loops behave very well steady state as transient states like startup, speed variations, or electric...

Analysis of the transmittance and reflectance transparent conducting oxide thin films nanocrystal can be accurately modeled using Drude free electron theory to extract electrical transport properties if enough care is taken. However, several fits starting from different initial guesses are needed before confidence in extracted parameters obtained. Film thickness, optical carrier concentration, mobility reliably derived when either a fully empirical or semiempirical model for ionized impurity...

A new method for broken rotor bars and load oscillation diagnosis on induction motors is presented. The proposed strategy based the decomposition of stator currents into their instantaneous active reactive current components. Such components allow decoupling effects produced by asymmetries from those oscillating loads. This allows not only proper fault detection but also a correct diagnosis. Simulation experimental results, both laboratory industrial cases, are presented to validate proposal.

A new control strategy for obtaining the maximum traction force of electric vehicles with individual rear-wheel drive is presented. sliding-mode observer proposed to estimate wheel slip and vehicle velocity under unknown road conditions by measuring only speeds. The based on LuGre dynamic friction model allows transmissible torque each driven be obtained instantaneously. can determined at any operating point condition, thus avoiding skid. maximizes while tire skid controlling motor....

Concentrating solar power plants use sensible thermal energy storage, a mature technology based on molten salts, due to the high storage efficiency (up 99%). Both parabolic trough collectors and central receiver system for concentrating technologies salts tanks, either in direct systems or indirect ones. But even though this is technology, it still shows challenges its implementation operation. This paper underscores critical importance of stringent design criteria salt tanks technology....

A new method to calculate the inductances of induction machines considering axial nonuniformity is proposed. The proposed method, an extension modified winding function approach, allows due skew and static dynamic air-gap eccentricity. Theoretical fundamentals experimental results that validate are presented.

We report here the first solid-state, NIR-selective electrochromic devices. Critical to device performance is arrangement of nanocrystal-derived electrodes into heteromaterial frameworks, where hierarchically porous ITO nanocrystal active layers are infiltrated by an ion-conducting polymer electrolyte with mesoscale periodicity. Enhanced coloration efficiency and transport realized over unarchitectured in devices, paving way towards new smart windows technologies.

In this paper, a strategy to control an induction generator (IG) working with variable speed and load is presented discussed. An inverter field-oriented controller are used in order excite the machine (IM) efficiently, minimizing copper iron losses, regulate generated voltage. The proposed IG system stand-alone (not grid connected) system. It produce electrical DC energy, charge battery bank, and/or supply loads maximum efficiency. A laboratory setup, based on conventional 4 kW squirrel-cage...

A novel control strategy for a stand-alone induction generator (IG), working with variable speed and load, is proposed. The IG simultaneously excited by capacitor an inverter. provides the rated reactive current needed to excite while inverter adds regulate output voltage. based on instantaneous power theory. 4 kW laboratory prototype has been built validate proposal experimental results are presented.

A voltage and frequency control for a stand-alone doubly-fed induction generator is presented in this paper. The strategy consists of simple vector with impressed rotor currents. This allows generating constant variable mechanical speed. Experimental results where obtained using 5.5 kW machine. behavior the frequency, under speed load, are shown. experimental confirm feasibility proposal.