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UPCommons - E-prints UPC Universitat Politècnica de Catalunya (75,324 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 316

1. Power quality aspects of smart grids - Bollen, Math H.J.; Zhong, Jin; Zavoda, Francisc; Meyer, Jan; McEachern, Alex; Córcoles López, Felipe
This paper gives an overview of the smart grids developments, seen from a power-quality viewpoint; describes the main relations between smart grids and power quality, and goes into some detail for some of the aspects. Different types of real and virtual energy storage are distinguished. Power-quality monitoring in the smart grid is discussed in detail. Further aspects discussed in the paper are: emission by new devices; interference between devices and power-line communication; allocation of emission limits; improving voltage quality; immunity of devices; and weakening of the transmission grid. Although the smart grid brings many new power-quality challenges, these should not result in the introduction...

2. New linear hybrid reluctance actuator - Andrada Gascón, Pedro; Blanqué Molina, Balduino; Martínez Piera, Eusebio; Torrent Burgués, Marcel; Garcia Amorós, Jordi; Perat Benavides, Josep Ignasi
In this paper a new type of hybrid reluctance actuator is presented. This linear hybrid reluctance actuator is a two phase double sided actuator in which the stator is composed by four normalized U cores, each with a coil wrapped around the yoke connecting the two arms of the core or with two coils wound on each of the arms and a permanent magnet placed near the air gap between and in contact with both arms. The mover is comprised of rectangular poles without connecting iron pieces between them but mechanically joined by non-magnetic mounting parts. The magnets are arranged so that their flux...

3. Thermal performance analysis of the double sided linear switched reluctance motor - Garcia Amoros, Jordi; Bargalló Perpiñá, Ramón; Andrada Gascón, Pedro; Blanqué Molina, Balduino
This paper presents a study about the thermal performance of the double-sided flat Linear Switched Reluctance Motor (LSRM) according to the number of phases (m) and the pole stroke (PS). The analysis is performed by means of the Finite Element Method (FEM) for electromagnetic computations and a lumped parameter for thermal model (LPT) both linked to an optimization algorithm based on the Response Surface Methodology (RSM) in order to reduce the computing time. The results show the LSRM behavior for achieving an optimal design from the point of view of the thermo-mechanical performance for a given insulation class and a duty cycle operating conditions.

4. Multiobjective optimization of IPM synchronous motors using response surface methodology and filtered montecarlo approach - Seifert, Robert; Bargalló Perpiñá, Ramón
Permanent Magnet Synchronous Motors offer high efficiency and power density besides low assembly effort and hence have been established in a wide market over the past years. Especially buried magnets enable a superior field weakening ability but require an exceptional design effort. Costly Finite Elements computations are inevitable for consideration of the occurring non-linearity and non-trivial magnet shapes. The Response Surface Methodology can reduce the number of FE runs significantly by introducing an acceptably exact second order regression model based on a few carefully chosen design samples. Instead of commonly used, but time-consuming Evolutionary Strategy methods, the Monte Carlo approach is applied for optimization. Using simple filter algorithms, distinctive Pareto frontiers can be determined quickly and...

5. Application of Posicast control method to generator excitation system - Ghorbani, Hamidreza; Candela García, José Ignacio; Luna Alloza, Álvaro; Rodríguez Cortés, Pedro
Application of Posicast control method to generator excitation system is presented in this paper. Presented control method is one of the simplest control design methods which can be installed in generators excitation to damp the oscillations caused by changing the excitation reference signal. Stability of the designed controller is shown using extensive time domain simulations. Performance of Posicast controller in IEEE power system standard models with presence of PV power plant is evaluated in MATLAB/Simulink environment.

6. Sliding mode control of a three-phase three-wire LCL rectifier - Biel Solé, Domingo; Dòria Cerezo, Arnau; Repecho del Corral, Víctor; Fossas Colet, Enric
This paper presents a dynamic analysis and the control design for a three-phase three-wire unity power factor rectifier with a LCL filter. The control algorithm is based on the sliding mode control techniques that provides good tracking performance and robustness with respect to parameter variations, and a PI controller to regulate the DC voltage. The sliding control design uses a decoupling matrix to solve the algebraic constraint on the grid currents. The control law has been tested in numerical simulations with satisfactory results. © 2014 IEEE.

7. Development and implementation of a dynamic PV emulator with HMI interface for high power inverters - Heredero Peris, Daniel; Capó Lliteras, Macià; Miguel Espinar, Carlos; Lledó Ponsati, Tomàs; Montesinos Miracle, Daniel
In this paper a 10 kVA photovoltaic emulator is presented. The system implemented generates photovoltaic V-I characteristic curves to analyse and test maximum power point tracking algorithms of real photovoltaic inverters according to the standard EN50530. The power converter used includes a threephase ac-dc active rectifier. The power stage selected allows to minimize the harmonic current content and permits to be closed to the unity power factor with a fast response. The emulator is controlled by a digital signal processor that communicates with a human-machine-interface. It allows to emulate static and dynamic responses. Furthermore, the interface is also capable of simulating weather evolution...

8. Simulation of an electric racing car using energetic macroscopic representation - Montesinos Miracle, Daniel; Fontán Tebar, Cristian; Vidal Salvia, Humbert
Formula Student is a university competition around the world where students are required to design, construct and compete with a race car in static and dynamic tests. Since few years ago, this competition has moved to electric propulsion. ETSEIB Motorsport Team at Barcelona, Spain has develop an electric race car and this paper presents the EMR and IBC developed for that in order to analyze the car and further improve the braking and traction system.

9. The CDMtek-PM: An educational platform for learning about motion control and electrical drives - Armero Almazán, Pablo; Montesinos Miracle, Daniel; Galcerán Arellano, Samuel; Rull Duran, Joan; Villafafila Robles, Roberto; Boix Aragonès, Oriol
The module CDMtek-PM has been developed with the needs of the electrical engineering students in mind. It is intended to serve as a platform to begin to consolidate the theoretical knowledge learned during the classes by providing a practical tool where they can program the software, for example with the CDMtek-DS module, and then observe, analyse and make real-time measures of the electrical and mechanical part of an electrical drive.

10. The CDMtek-DS - an educational platform for entering into the microcontrollers world - Armero Almazán, Pablo; Galcerán Arellano, Samuel; Bergas Jané, Joan Gabriel; Sumper, Andreas; Gomis Bellmunt, Oriol; Sudrià Andreu, Antoni
The module CDMtek-DS is a standalone module with which the student can learn how to program a microcontroller or a digital signal processor and interact with the peripherals included in the module. It also includes a CAN transceiver to get into the industrial communications world. This module is intended to be used with the CDMtek-PM to build a complete platform for motion control.

11. Sliding mode control of a three-phase four-wire LCL rectifier - Biel Solé, Domingo; Dòria Cerezo, Arnau; Fossas Colet, Enric
In this paper a control algorithm for a three-phase four-wire rectifier with an inductive-capacitive-inductive filter is presented. The control scheme consists in an inner current loop designed using the Sliding Mode Control technique, and an two external loops that regulates the DC bus voltage and also keeps the split bus balanced. Numerical simulations are also provided to show the performance of the closed loop. © 2014 IEEE.

12. Hysteresis motor with self sustained rotor for high speed applications - Granados García, Xavier; Márquez, Isabel; Mora Serrano, Javier; Fontcuberta, Josep; Obradors Berenguer, Xavier; Pallarés, J.; Bosch Tous, Ricardo
Pellets of YBCO HTSC have been used to construct a cylindrically shaped rotor. A four poles/four phases stator has been wound in order to build a motor. The motor behaves as an hysteresis motor when it starts and as synchronous in the steady state. The levitation forces associated to the flux inside the rotor region and the flux dispersed at the basal surfaces contribute to maintain the rotor anchored to its cavity in a self-sustained configuration. Power and torque in the synchronous regime, centering forces, static excitation field mapping and field distribution at the HTSC surface have been investigated.

13. Identification and local linear control of a DC-DC buck converter using local model networks - Rouzbehi, Kumars; Miranian, Arash; Rakhshani, Elyas; Luna Alloza, Álvaro; Rodríguez Cortés, Pedro
Peer Reviewed

14. Comparison of the occupational hazards in the Spanish mining sector based on the type of workplace in the period 2003-2012 - Sanmiquel Pera, Lluís; Freijo Álvarez, Modesto; Rossell Garriga, Josep Maria; Bascompta Massanés, Marc
Methods and background: This review has done a comparison of the 3 types of workplace in the Spanish mining sector. The 3 workplaces considered are: mines, quarries and mineral processing plants. The 10 most frequent accidents and deviations have been obtained for each one. It has also been calculated the annual incidence, frequency, average duration and severity indexes as well as the risk index for each one. Besides, the accident distribution has been modelling, based on exponential distribution function of the lost days in the 3 workplaces mentioned. Results: The main sort of accident is due to physical overexertion and...

15. Workplace accidents in mining of Catalonia in 2012 - Freijo Álvarez, Modesto; Sanmiquel Pera, Lluís; Vintró Sánchez, Carla
Objective: To compare in Catalonia , the incidence of fatal occupational injuries and non-fatal accidents for workers in the mining sector Subterrania workers with open-pit mining in 2012 . Methods : Data from accident injuries came from the Ministry of Labour and Immigration and the Department of Industry , Mines i Energia de la Generalitat de Catalunya. The incidence of fatal and non-fatal injuries was calculated by accident and the Odds Ratio (OR ) in the confidence interval of 95% ( 95 % CI) for mineworkers in Subterrania compared to workers in the mining opencast Results and discussion: the OR...

16. A hierarchical control structure for multi-terminal VSC-based HVDC grids with GVD characteristics - Rouzbehi, Kumars; Miranian, Arash; Candela García, José Ignacio; Luna Alloza, Álvaro; Rodríguez Cortés, Pedro
This paper presents a hierarchical control structure for Multi terminal HVDC grids. The hierarchical control structure is inspired by the three-layer control structure of largescale AC power systems and it is divided into primary, secondary and tertiary control. This structure permits to create an easy interaction between power dispatch and the lower controllers. Moreover, a generalized voltage droop (GVD) characteristic is also proposed which facilitates control issues inside the Multi terminal HVDC grids. In the proposed control structure, the coefficients of the GVD characteristics are set based on the solution of a DC power flow algorithm, executed in the secondary control level.

17. Optimized control of multi-terminal DC GridsUsing particle swarm optimization - Rouzbehi, Kumars; Miranian, Arash; Luna Alloza, Álvaro; Rodríguez Cortés, Pedro
This paper addresses the important issue of Multi-Terminal DC (MTDC) grid control strategy based on the particle swarm optimization (PSO) technique. The MTDC grid is controlled by the concept of vector control, in which the AC currents and voltages are transformed into the rotating directquadrature (d-q) reference quantities which are subsequently used for decoupled control of the active and reactive powers as well as the DC and AC voltages. The paper employs an efficient PSO algorithm for optimal tuning of the controllers’ parameters in an MTDC grid. In addition, voltage droop control scheme is utilized to ensure the balance of...

18. Comprehensive analogy between conventional AC grids and DC grids characteristics - Rouzbehi, Kumars; Gavriluta, Catalin; Candela García, José Ignacio; Luna Alloza, Álvaro; Rodríguez Cortés, Pedro
The high penetration of renewable energy resources, such as wind and photovoltaic, as well as the development of power electronics devices play an important role in the development of DC grids. However, the evolution of DC-systems from point-to-point connections to ‘Multi-terminal’ DC (MTDC) networks is not so straight forward. At the current moment there is a large gap in the literature concerning the dynamics, control and operation of MTDC networks. On the other hand, conventional AC networks have been studied exhaustively in the past decades providing for a rich inspiration source. In this paper we are going to establish a comprehensive analogy between the...

19. Adaptive droop for primary control in MTDC networks with energy storage - Gavriluta, Catalin; Candela García, José Ignacio; Luna Alloza, Álvaro; Rocabert Delgado, Joan; Rodríguez Cortés, Pedro
Multi-terminal DC (MTDC) systems are drawing a lot of interest lately in applications related to distributed generation, especially in those that integrate wind or PV systems together with energy storage. This paper proposes an improved strategy for the primary control of MTDC integrating energy storage (ES) units. The concept is based on the combination of a droop control method and dc-bus signaling in order to provide a generic approach to be used as basis for a hierarchical control structure in a multi-point DC-bus system. The proposed method considers the State of Charge (SoC) of the energy storage system at the primary...

20. A generalized voltage droop strategy for control of multi-terminal DC grids - Rouzbehi, Kumars; Miranian, Arash; Luna Alloza, Álvaro; Rodríguez Cortés, Pedro
This paper proposes a generalized voltage droop (GVD) control strategy for control and power sharing in voltage source converter (VSC)-based multi-terminal DC (MTDC) grids. In the proposed approach, the conventional voltage droop characteristics of voltage-regulating VSC stations are replaced by the GVD characteristics. The proposed GVD control strategy can be operated in three different control modes including conventional voltage droop control, fixed active power control and fixed DC voltage control by proper adjustment of the GVD characteristics of the voltage-regulating converters. The proposed strategy improves the control and power-sharing capabilities of the conventional voltage droop, and enhances its maneuverability. Simulation...

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