Banco para emulación de turbinas eólicas

En este trabajo se propone la implementación de un banco de ensayos para sistemas de generación eléctrica (generadores eléctricos, incluyendo sus controles y cargas) de uso en turbinas eólicas. Este banco de ensayos permite emular la dinámica de una turbina conectada al generador. Esto se consigue a través del control de par de una Máquina de Corriente Continua (M CQ en función de un perfil de viento predeterminado. El control de par se realiza a través de la simulación en tiempo real de la característica y de la dinámica de la turbina (incluyendo inercia, rozamiento, etc ). El objetivo de este banco es realizar ensayos de rendimiento y determinar la respuesta dinámica del control de diferentes tipos de generadores.Tema: Energía eólica, geotermia y otras energías no convencionales.Asociación Argentina de Energía Sola

Banco para emulación de turbinas eólicas

En este trabajo se propone la implementación de un banco de ensayos para sistemas de generación eléctrica (generadores eléctricos, incluyendo sus controles y cargas) de uso en turbinas eólicas. Este banco de ensayos permite emular la dinámica de una turbina conectada al generador. Esto se consigue a través del control de par de una Máquina de Corriente Continua (M CQ en función de un perfil de viento predeterminado. El control de par se realiza a través de la simulación en tiempo real de la característica y de la dinámica de la turbina (incluyendo inercia, rozamiento, etc ). El objetivo de este banco es realizar ensayos de rendimiento y determinar la respuesta dinámica del control de diferentes tipos de generadores.Tema: Energía eólica, geotermia y otras energías no convencionales.Asociación Argentina de Energía Sola

Banco para emulación de turbinas eólicas

En este trabajo se propone la implementación de un banco de ensayos para sistemas de generación eléctrica (generadores eléctricos, incluyendo sus controles y cargas) de uso en turbinas eólicas. Este banco de ensayos permite emular la dinámica de una turbina conectada al generador. Esto se consigue a través del control de par de una Máquina de Corriente Continua (M CQ en función de un perfil de viento predeterminado. El control de par se realiza a través de la simulación en tiempo real de la característica y de la dinámica de la turbina (incluyendo inercia, rozamiento, etc ). El objetivo de este banco es realizar ensayos de rendimiento y determinar la respuesta dinámica del control de diferentes tipos de generadores.Tema: Energía eólica, geotermia y otras energías no convencionales.Asociación Argentina de Energía Sola

Comparative study of back-stepping controller and super twisting sliding mode controller for indirect power control of wind generator

© 2021 Springer. This is the accepted manuscript version of an article which has been published in final form at https://doi.org/10.1007/s13198-019-00905-7This paper presents the application nonlinear control to regulate the rotor currents and control the active and reactive powers generated by the Doubly Fed Induction Generator used in the Wind Energy Conversion System (WECS). The proposed control strategies are based on Lyapunov stability theory and include back-stepping control (BSC) and super-twisting sliding mode control. The overall WECS model and control scheme are developed in MATLAB/Simulink and the simulation results have shown that the BSC leads to superior performance and improved transient response as compared to the STSMC controller.Peer reviewe

Encephalopathy associated with autoimmune thyroid disease in patients with Graves' disease: clinical manifestations, follow-up, and outcomes

<p>Abstract</p> <p>Background</p> <p>The encephalopathy associated with autoimmune thyroid disease (EAATD) is characterized by neurological/psychiatric symptoms, high levels of anti-thyroid antibodies, increased cerebrospinal fluid protein concentration, non-specific electroencephalogram abnormalities, and responsiveness to the corticosteroid treatment in patients with an autoimmune thyroid disease. Almost all EAATD patients are affected by Hashimoto's thyroiditis (HT), although fourteen EAATD patients with Graves' disease (GD) have been also reported.</p> <p>Methods</p> <p>We have recorded and analyzed the clinical, biological, radiological, and electrophysiological findings and the data on the therapeutic management of all GD patients with EAATD reported so far as well as the clinical outcomes in those followed-up in the long term.</p> <p>Results</p> <p>Twelve of the fourteen patients with EAATD and GD were women. The majority of GD patients with EAATD presented with mild hyperthyroidism at EAATD onset or shortly before it. Active anti-thyroid autoimmunity was detected in all cases. Most of the patients dramatically responded to corticosteroids. The long term clinical outcome was benign but EAATD can relapse, especially at the time of corticosteroid dose tapering or withdrawal. GD and HT patients with EAATD present with a similar clinical, biological, radiological, and electrophysiological picture and require an unaffected EAATD management.</p> <p>Conclusions</p> <p>GD and HT equally represent the possible background condition for the development of EAATD, which should be considered in the differential diagnosis of all patients with encephalopathy of unknown origin and an autoimmune thyroid disease, regardless of the nature of the underlying autoimmune thyroid disease.</p

FR 44. Evaluation of two freezing boar semen techniques. Preliminary results of a fertility trial

The aim of this work is to compare the quality of boar semen frozen in maxistraws and pellets, and to evaluate the fertility through parturition rate.Rich sperm fraction from a two year fertile Hampshire boar was obtained by the gloved hand technique. Semen for freezing was required to have at least 70 % of motile spermatozoa and vigor 3 (1-5). Samples were processed and packed according the respective techniques of maxistraw and pellet. Both maxistraws (5ml) and pellets (100 pellets) insemination dose (6 x 109 spermatozoa) were diluted in BTS (Beltsville Thawing Solution, IMV, USA). Each of 21 white hybrid gilts were synchronised with 750 mg via IM of PMSG (Novormon, Syntex S. A.) and then inseminated twice, 12 and 24 h after standing reflex with a Melrose catheter. Group A (11) was inseminated with maxistraws, three of which farrowed 10, 9 and 4 piglets. Group B (10) was inseminated with pellets but no parturition occured. Thess non expected results are non satisfactory, so much efforts must be made for a better control of principal variables