UPCommons - E-prints UPC Universitat Politècnica de Catalunya
(51.553 recursos)
E-prints UPC cobreix dues finalitats: per una banda, és el dipòsit institucional de la UPC que recull els articles de revista, les comunicacions de congrés i els reports de recerca generats en les activitats de recerca del personal docent i investigador de la universitat; per l'altra, és una eina que permet accelerar la producció científica, allotjant versions de documents prèvies a la publicació en una revista o a les actes d’un congrés.
Ponències/Comunicacions de congressos
Mostrando recursos 1 - 20 de 249
1.
Current control design for three-phase grid-connected inverters using a pole placement technique based on numerical models - Citro, Costantino; Gavriluta, Catalin; Nizak Md, H. K.; Beltran, H.
This paper presents a design procedure for linear current controllers of three-phase grid-connected inverters. The proposed method consists in deriving a numerical model of the converter by using software simulations and applying the pole
placement technique to design the controller with the desired performances. A clear example on how to apply the technique is
provided. The effectiveness of the proposed design procedure has been verified through the experimental results obtained with
a 10kW grid-connected three-phase inverter prototype.
2.
Resonance analysis of a wind power plant with modal approach - Rauma, Kalle; Md. Hasan, Khairul Nisak; Gavriluta, Catalin; Citro, Costantino
A detailed harmonic resonance analysis of power systems is more and more important due to the increasing number of power electronic devices. The topic is especially wellgrounded
in wind power plants that besides having several possible sources of harmonics have many inductive and capacitive elements. This combination forms a severe concern
over harmonic resonance that composes a threat to the power quality and the function of wind power plants. This paper presents and applies the harmonic resonance mode analysis (HRMA) in a model of an off shore wind power plant with and without a passive filtering. The results of the harmonic
resonance mode...
3.
A simple approach for fast controller prototyping for a three phase interleaved DC-DC converter - Gavriluta, Catalin; Citro, Costantino; Nisak, Khairul; Beltrán San Segundo, Héctor
Initial control prototyping in power electronics is often a matter of trial and error because of the complicated mathematics involved in modeling systems based on their
internal structure. Moreover, in practice, small changes as the introduction of a measurement filter or the change of the sensing system appear all the time. If the controller design method was based on the internal structure of the system, then these small changes would mean a re-iteration through all the cumbersome equations. This paper presents a simple methodology for fast
control prototyping based on the approximation of the Bode plots. As prerequisites, a power electronics simulation...
4.
Accurate Bearing Faults Classification based on Statistical-Time Features, Curvilinear Component Analysis and Neural Networks - Delgado Prieto, Miquel; Cirrincione,, Giansalvo; García Espinosa, Antonio; Ortega Redondo, Juan Antonio; Henao, Humberto
Bearing faults are the commonest form of
malfunction associated with electrical machines. So far, the
research has been carried out mainly in the detection of
localized faults, but the diagnosis of distributed faults is still
under development. In this context, this work presents a new
scheme for detecting and classifying both kinds of faults. This
work deals with a new diagnosis monitoring scheme, which is
based on statistical-time features calculated from vibration
signal, curvilinear component analysis for compression and
visualization of the features behavior and a hierarchical neural
network structure for classification. The obtained results from
different operation conditions validate the effectiveness and
feasibility of the proposed methodology.
5.
A novel condition monitoring scheme for bearing faults based on Curvilinear Component Analysis and hierarchical neural networks - Delgado Prieto, Miquel; Cirrincione,, Giansalvo; García Espinosa, Antonio; Ortega Redondo, Juan Antonio; Henao, Humberto
Mostly the faults in electrical machines are
related with the bearings. Thus, a reliable bearing condition
monitoring scheme able to detect either local or distributed
defects are mandatory to avoid a breakdown in the machine.
So far, the research has been carried out mainly in the
detection of local faults, such as balls and raceways faults, but
surface roughness is not so reported. This paper deals with a
novel and reliable scheme capable to detect any fault that may
occur in a bearing, based on EXIN Curvilinear Component
Analysis, CCA, and Neural Network. The EXIN CCA, which
is an improvement of the Curvilinear Component Analysis,
has been conceived for data visualization,...
6.
STLF in the user-side for an iEMS based on evolutionary training of adaptive networks - Cárdenas Araújo, Juan José; Giacometto Torres, Francisco; García Espinosa, Antonio; Romeral Martínez, José Luis
It is a fact that the short-term load forecasting (STLF)in the user side is growing interest. Consequently,
intelligent energy management systems (iEMSs) are including this capability in order to take autonomous decisions. In this context, this paper presents a new STLF scheme based on Adaptative Networks Fuzzy
Inference Systems (ANFIS). This ANFIS has an
exponential output membership functions (e-ANFIS) and has been trained by means of a novel evolutionary training algorithm (ETA). Due to the computational burden required by ETA, parallel computing was used to
eliminate this problem especially for embedded applications. This new scheme has been tested with real data from an automotive...
7.
Control of Full-Scale Converter based Wind Power Plants for damping of low frequency system oscillations - Rodríguez Cortés, Pedro; Teodorescu, Remus; Adamczyk, Andrzej Grzegorz
Damping of low frequency power oscillations is one
of essential aspects of maintaining power system stability. In
literature can be found publications on damping capability of
Doubly Fed Induction Generator based wind turbines. This
paper extends discussion on Wind Power Plant damping
capability to Full-Scale Converter based type. Moreover
resemblance of such Wind Power Plant to modern FACTS
devices is recognized and exploited. Paper discusses many aspect
of damping controller design, including feedback signal selection
and control effectiveness with respect to wind farm location.
Analysis and design is based on modal analysis, therefore
matching modeling approach for wind power plant is proposed.
Finally, performance of Wind Power Plant damping control is
compared to...
8.
Var reserve concept applied to a wind power plant - Martinez, J.; Kjaer, Philip Carne; Rodríguez Cortés, Pedro; Teodorescu, Remus
wind power plants.
This paper proposes two different VAr reserve control
strategies for a wind power plant.
The amount of dynamic VAr available most of the operation
time, makes the wind power plant (WPP) a good candidate to
include a VAr reserve management system. Two different ways
of implementing a VAr management system are proposed and
analyzed.
9.
Self-video recording for the integration and assessment of generic competencies - Masip Álvarez, Albert; Hervada Sala, Carme; Pàmies Gómez, Teresa; Arias Pujol, Antoni; Jaen Fernandez, Carles; Rodríguez Sorigué, M. Cristina; Romero Durán, David; Nejjari Akhi-Elarab, Fatiha; Álvarez del Castillo, María Dolores; Roca Lefler, Marta; Hernández Farràs, Jorge; Montferrer Liñan, Raul
This document presents the use of a self-video-recording service for the integration and assessment of certain generic competences (oral and written communication, teamwork and third (English) language) in all degree programs related to the Industrial area at the Terrassa School of Engineering (EET). The resulting service allows to carry out the assessment through active and collaborative learning methodologies using ICT as a support, becoming an educational resource where students are encouraged to evaluate their own activity, individually and in groups (co-evaluation), and with which the faculty can enhance certain sections of the syllabus while also evaluating generic competences.
This paper...
10.
Storage possibilities for enabling higher wind energy penetration - Swierczynski, M.; Teodorescu, Remus; Rasmunssen, C. N.; Rodríguez Cortés, Pedro; Vikelgaard, H.
As the installed worldwide wind energy capacity increases about 30% annually and Kyoto protocol that came in force in 2005, wind penetration level in power system is considered to significantly increase in near future. Due to increased penetration and nature of the wind, especially its intermittency, partly unpredictability and variability, wind power can put the operation of power system into risk. One of the possible solutions can be an addition of energy storage into wind power plant. This paper deals with state of the art of the Energy Storage (ES) technologies and their possibility of accommodation for wind turbines. Overview...
11.
Smart - STATCOM control strategy implementation in wind power plants - Sintamarean, Craiun; Cantarellas, A.; Miranda, Hernan; Rodríguez Cortés, Pedro; Teodorescu, Remus
High penetration of wind energy into the grid may introduce stability and power quality problems due to the fluctuating nature of the wind and the increasing complexity of the power system. By implementing advanced functionalities in power converters, it is possible to improve the performance of the wind farm and also to provide grid support, as it is required by the grid codes. One of the main compliance difficulties that can be found in such power plants are related to reactive power compensation and to keep the harmonics content between the allowed limits, even if the power of the WPP...
12.
Study on harmonic resonances and damping in wind power plant - Md. Hasan, Khairul Nisak; Rauma, Kalle; Luna Alloza, Álvaro; Candela García, José Ignacio; Rodríguez Cortés, Pedro
Harmonic resonance is among imperative aspect need to be analyzed in a wind power plant (WPP). It becomes complex since it involves a large network with high operating power. This paper presents a study on harmonic resonances in a WPP, particularly on parallel resonance. Important factors including length of cable, number of operating wind turbine and usage of output grid-side filter are analyzed. The damping of resonance by using common passive filter and an alternative hybrid filter is also explored. An aggregated WPP model of 400 MW with 40 wind turbines of 10 MW each are used as a study...
13.
PSO based optimal output feedback controller for two-area LFC system - Rakhshani, Elyas; Luna Alloza, Álvaro; Sadeh, J.; Rodríguez Cortés, Pedro
A new combined method based on optimal control is proposed to enhance load frequency control dynamics. This method include of PSO and optimal output feedback controller. In the output feedback method only the measurable state variables within each control area is required to use for feedback. The optimal control law is determined by minimizing a performance index under the output feedback conditions leading to a coupled matrix equation. But for more accuracy and better design for this controller, PSO algorithm is applied to find the gain matrix of the controller. The results of the simulation are shown that with using...
14.
Two upward lightning at the Eagle Nest tower - Montañá Puig, Juan; Van der Velde, Oscar Arnoud; Romero Durán, David; March Nomen, Víctor; Solà de Las Fuentes, Gloria; Pineda Ruegg, Nicolau; Soula, Serge; Hermoso Alameda, Blas
A new instrument composed by a high speed camera, two high energy detectors, a E-field antenna and a VHF antenna were installed at the Eagle Nest tower (northeast of Spain) during summer 2011. With this equipment several lightning flashes to the tower and its vicinity have been observed. This paper presents two examples: the first was an upward negative leader triggered by a close c1oud-to-ground flash and the second was an upward negative flash not associated with previous lightning activity. The paper also presents 3D mapping of leaders of two upward lightning
15.
Enhanced average current-mode control for DC-DC converters based on an optimized fuzzy logic controller - Rouzbehi, Kumars; Miranian, Arash; Citro, Costantino; Luna Alloza, Álvaro; Rodríguez Cortés, Pedro
This paper proposes a novel optimized fuzzy logic controller (OFLC) for current-mode control (CMC)-based voltage regulation in DC-DC converters. The implementation of the proposed fuzzy logic controller (FLC) does not depend on the mathematical model of the converter and only requires knowledge about its operation modes. The fast and efficient algorithm of particle swarm optimization (PSO) has been employed to enhance the performance of the FLC by fine tuning its membership functions. The reference current for the current control loop has been obtained in the outer voltage loop by measuring load current and output voltage and calculating the load resistive...
16.
X-rays from laboratory sparks in air: the relationship between runaway electrons and the electric field - March Nomen, Víctor; Montañá Puig, Juan; Romero Durán, David; Solà de Las Fuentes, Gloria; Van der Velde, Oscar Arnoud
This article presents an experiment in which the gap distance was varied between 46 and 84 cm. Series of 15 voltage impulses were applied for each distance and different peak voltages with a rise time of 600 ns. The results of a total of 20 series of impulse voltages show that emissions depend on the electric field derivative within the gap
17.
Total lightning observations to wind turbines - Montañá Puig, Juan; Van der Velde, Oscar Arnoud; Romero Durán, David; March Nomen, Víctor; Solà de Las Fuentes, Gloria; Pineda Ruegg, Nicolau; Hermoso Alameda, Blas; Senosiáin Miquélez, Vicente
In summer 2011 a new VHF Lightning Mapping Array was installed at the northeast of Spain. In that area a VHF interferometer and a VLFILF lightning detection networks are also operative. The close presence of wind farms in the area of the Lightning Mapping Array showed some lightning activity not reported before. This paper describes the observations and discusses the possible effects to the wind turbine lightning protection
18.
Study of single-flash thunderstorms over wind farms in the Basque Country - López, Javier; Hernáez, Iñigo; Montañá Puig, Juan
This paper presents six different thunderstorms affecting wind farms in the Basque Country. In this work, single-flash thunderstorms are discussed. The term single-flash is used in order to refer thunderstorms that leave very few or even only one lightning flash. Those flashes affected to the tall structures. The lightning impacts have been detected using different technologies in two separate lightning detection and location networks. Depending on the peak current estimated by the lightning detection sensors, most of the detections can be classified as upward leaders initiated by the wind turbines in presence of a thundercloud. Both cold and warm season...
19.
Multilevel modular DC/DC converter for regenerative braking using supercapacitors - Massot Campos, Miquel; Montesinos Miracle, Daniel; Bergas Jané, Joan Gabriel; Rufer, Alfred
Regenerative braking is presented in many electric traction applications such as electric and hybrid vehicles, lifts and
railway. The regenerated energy can be stored for future use, increasing the efficiency of the system. This paper outlines the benefits of the MMC (modular multilevel converter) in front of the cascaded or series connection of converters to achieve high voltage from low voltage storage elements such as supercapacitors. The paper compares three different solutions and shows that the MMC can benefit from weight and volume reduction of the output inductance when shifted switching modulation strategy is used. Using this modulation strategy, not only...
20.
Dimensioning electric charging posts for PEV - Cairó, Ignasi; Cruz, Miguel; Sumper, Andreas
This paper represents a new analysis method for the estimation of the required charging infrastructure for the electric vehicles (EV’s). The study is based on a real metropolitan area, taking real data from transport habits, and a prediction of certain degree of penetration of EV’s. To cope with this analysis, is the application of powerful tools, used for example in telecommunication systems such as Markov chains, and applied here into EV’s necessities and charging stations infrastructures. This theory is applied in a real example to provide more insight on how can be applied in real circumstances.
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