Ponències/Comunicacions de congressos
http://hdl.handle.net/2117/3653
2015-09-02T11:10:19ZMultiobjective optimization of IPM synchronous motor using response surface methodology and filtered Monte Carlo approach
http://hdl.handle.net/2117/26705
Multiobjective optimization of IPM synchronous motor using response surface methodology and filtered Monte Carlo 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 related to their causative motor designs.
2014-01-01T00:00:00ZBurden resistor selection in current transformers for low power applications
http://hdl.handle.net/2117/26509
Burden resistor selection in current transformers for low power applications
Conesa Roca, Alfons; Bargalló Perpiñá, Ramón; Velasco Quesada, Guillermo; Román Lumbreras, Manuel
In order to sense AC current with electric isolation in high frequency switching power converters the most simple and low cost solution is to consider a current transformer with a burden resistor. But burden resistor selection is not a simple task because involves a lot of considerations that affect the output voltage and its signal-to-noise ratio and the bandwidth of the measure. In this paper, considering the basic equations of the transformer and applying the Laplace Transformation is obtained a simple model of the current transformer interesting to select burden resistor and even to design the current transformer in case of high frequency applications
2014-01-01T00:00:00ZModeling harmonics of networks supplying nonlinear loads
http://hdl.handle.net/2117/26314
Modeling harmonics of networks supplying nonlinear loads
Lamich Arocas, Manuel; Balcells Sendra, Josep; Corbalán Fuertes, Montserrat; Sainz Sapera, Luis; Fernandez, Cristian
This work presents the development and validation of a model for electric networks supplying nonlinear loads (NLL). The model is based on Neural Networks (NN) and its purpose is the prediction of harmonic currents sank by the loads, in case of supply impedance changes caused by the insertion or releasing of neighboring loads or by the voluntary insertion of filters to reduce such harmonic currents. The NN is trained using data obtained from several Matlab simulations and the model is validated using the same network with different supply impedances and load conditions.
2014-01-01T00:00:00ZPower quality aspects of smart grids
http://hdl.handle.net/2117/26163
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 of unnecessary barriers against the introduction of new
technology.
2010-01-01T00:00:00ZThermal performance analysis of the double sided linear switched reluctance motor
http://hdl.handle.net/2117/24976
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.
2014-01-01T00:00:00ZMultiobjective optimization of IPM synchronous motors using response surface methodology and filtered montecarlo approach
http://hdl.handle.net/2117/24975
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 related to their causative motor designs.
2014-01-01T00:00:00ZPrograma de análisis térmico de máquinas eléctricas rotativas
http://hdl.handle.net/2117/20226
Programa de análisis térmico de máquinas eléctricas rotativas
Bargalló Perpiñá, Ramón; Morón Romera, Juan; Rahuet Jane, Jaume
2013-01-01T00:00:00ZAnalysis of PMSM using FE analysis: a didactical approach for EMF determination and cogging torque reduction.
http://hdl.handle.net/2117/14551
Analysis of PMSM using FE analysis: a didactical approach for EMF determination and cogging torque reduction.
Bargalló Perpiñá, Ramón; Sust de Rosselló, Jorge; Morón Romera, Juan; Pujolras, Joan Carles
FE analysis is a useful technique, but the
interpretation of the results are sometimes confuse and dark. In this paper we shown some methods to determine the back emf in PMSM and how determine and reduce the cogging
torque. Our students use these methods and comparing the obtained results, they learn about the post-processing magnitudes in FE analysis and its interpretation; probably the
most difficult task in this calculation method. Additionally these results are compared to a prototype and the results are
agreed with the prediction.
2012-01-01T00:00:00ZControl of power converters in distributed generation applications under grid fault conditions
http://hdl.handle.net/2117/13442
Control of power converters in distributed generation applications under grid fault conditions
Rodríguez Cortés, Pedro; Luna Alloza, Álvaro; Muñoz Aguilar, Raúl Santiago; Córcoles López, Felipe; Teodorescu, Remus; Blaabjerg, Frede
The operation of distributed power generation
systems under grid fault conditions is a key issue for the
massive integration of renewable energy systems. Several
studies have been conducted to improve the response of such
distributed generation systems under voltage dips. In spite of
being less severe, unbalanced fault cause a great number of
disconnections, as it may produce the injection of unbalanced
currents that can easily conduct to the tripping of the
converter. In this paper a current control strategy for power
converters able to deal with these grid conditions, without
exceeding the current ratings of the converter is introduced.
Moreover, a novel flexible algorithm has been proposed in
order to regulate easily the injection of positive and negative
currents for general purpose applications.
2011-01-01T00:00:00ZVoltage feed-forward performance in stationary reference frame controllers for wind power applications
http://hdl.handle.net/2117/13282
Voltage feed-forward performance in stationary reference frame controllers for wind power applications
Ma, Lin; Luna Alloza, Álvaro; Rocabert Delgado, Joan; Muñoz Aguilar, Raúl Santiago; Córcoles López, Felipe; Rodríguez Cortés, Pedro
In order to improve the connected current and the
response speed of the controller, stationary reference frame
control strategy with proportional resonant (P-R) controller due
to its high dynamic and good harmonic compensation
performance characteristics was already used in many different
DG applications. This paper introduced an additional stationary
reference frame control strategies with voltage feed-forward
method. By using this method, both the quality of grid connected
current and the dynamic performance are improved, which also
validated by experiments.
2011-01-01T00:00:00Z