Ponències/Comunicacions de congressos
http://hdl.handle.net/2117/3543
Sat, 24 Jun 2017 00:31:55 GMT2017-06-24T00:31:55ZControl method of impedance network in SiC power converters for HEV/EV
http://hdl.handle.net/2117/105076
Control method of impedance network in SiC power converters for HEV/EV
Fernández Palomeque, Efrén Esteban; Paredes, Alejandro; Sala, Vicent; Romeral Martínez, José Luis
Silicon carbide (SiC) devices provide significant performance improvements in many aspects, including lower
power dissipation, higher operating temperatures, and faster switching, compared to conventional Si devices. All these
features helped increase the interest in the applications of these devices for electric drive systems. The inclusion of an impedance network to elevate DC voltage would improve performance of an electric-traction system, because the topologies of impedances networks can eliminate the need of a DC-DC converter. However, it is important to know control methods that applicable to this type of topologies to systems that are more efficient. This paper presents the analysis of a control method in a power converter topology using SiC devices with an impedance network to elevate DC voltage for electric traction applications. The proposed analisys includes the implementation of a control method in Current Fed Quasi-Z topology, with 100 kHz switching frequency, and its analysis using the simulation of the control method, the power losses in SiC devices and the stress on passive components in the impedance network. Finally, the obtained results are compared with a conventional Current Fed Quasi-Z topology built with silicon devices at a low switching frequency (2 KHz).
Wed, 31 May 2017 13:59:11 GMThttp://hdl.handle.net/2117/1050762017-05-31T13:59:11ZFernández Palomeque, Efrén EstebanParedes, AlejandroSala, VicentRomeral Martínez, José LuisSilicon carbide (SiC) devices provide significant performance improvements in many aspects, including lower
power dissipation, higher operating temperatures, and faster switching, compared to conventional Si devices. All these
features helped increase the interest in the applications of these devices for electric drive systems. The inclusion of an impedance network to elevate DC voltage would improve performance of an electric-traction system, because the topologies of impedances networks can eliminate the need of a DC-DC converter. However, it is important to know control methods that applicable to this type of topologies to systems that are more efficient. This paper presents the analysis of a control method in a power converter topology using SiC devices with an impedance network to elevate DC voltage for electric traction applications. The proposed analisys includes the implementation of a control method in Current Fed Quasi-Z topology, with 100 kHz switching frequency, and its analysis using the simulation of the control method, the power losses in SiC devices and the stress on passive components in the impedance network. Finally, the obtained results are compared with a conventional Current Fed Quasi-Z topology built with silicon devices at a low switching frequency (2 KHz).Implementation of high frequency SVM in a digital system for CS-SiC inverter
http://hdl.handle.net/2117/105075
Implementation of high frequency SVM in a digital system for CS-SiC inverter
Fernández Palomeque, Efrén Esteban; Paredes, Alejandro; Sala, Vicent; Romeral Martínez, José Luis
The operation of current source inverters at high frequency allows to reduce the size of the input coil and output filters. These advantages allowed to obtain converters with better performance and to reduce the size and weight of the passives elements, decreasing the manufacturing costs and while keeping the current harmonic distortion low. For these reasons, it is necessary to implement a modulation technique that allows the converter to work at a higher frequency 100 KHz.
This article presents the design and implementation of a Space Vector Modulation (SVM) technique for high switching frequencies for a Current Source Inverter (CSI) topology implemented with SiC devices. The technique is programmed and implemented in a PIC 24FJ256GA406 microcontroller, for the activation and control of SiC devices in each leg of power converter.
Wed, 31 May 2017 13:54:45 GMThttp://hdl.handle.net/2117/1050752017-05-31T13:54:45ZFernández Palomeque, Efrén EstebanParedes, AlejandroSala, VicentRomeral Martínez, José LuisThe operation of current source inverters at high frequency allows to reduce the size of the input coil and output filters. These advantages allowed to obtain converters with better performance and to reduce the size and weight of the passives elements, decreasing the manufacturing costs and while keeping the current harmonic distortion low. For these reasons, it is necessary to implement a modulation technique that allows the converter to work at a higher frequency 100 KHz.
This article presents the design and implementation of a Space Vector Modulation (SVM) technique for high switching frequencies for a Current Source Inverter (CSI) topology implemented with SiC devices. The technique is programmed and implemented in a PIC 24FJ256GA406 microcontroller, for the activation and control of SiC devices in each leg of power converter.Optimization of modular wiring harnesses by means of regression models for temperature prediction of wire bundles
http://hdl.handle.net/2117/102597
Optimization of modular wiring harnesses by means of regression models for temperature prediction of wire bundles
Rius Rueda, Armand; García Espinosa, Antonio; Díaz Millán, Manuel Alberto
Automotive wiring harnesses have become heavier and more complex due to their increasing number of electrical components. It is now desired to reduce their mass of copper. For this purpose, experimentation can be partially replaced by simulation, but it is still impossible to exhaustively simulate all of the combinations of modular wiring harness. This proposed approach consists of carrying out simulations using the FEM method and using their results to create regression models. Polynomial formulae can give the same information as simulations within a clearly reduced time and satisfying accuracy. An optimization algorithm introduced in this study will use them to assign new cable cross-sections of harnesses considering their currents and the ambient temperature.
Thu, 16 Mar 2017 14:32:20 GMThttp://hdl.handle.net/2117/1025972017-03-16T14:32:20ZRius Rueda, ArmandGarcía Espinosa, AntonioDíaz Millán, Manuel AlbertoAutomotive wiring harnesses have become heavier and more complex due to their increasing number of electrical components. It is now desired to reduce their mass of copper. For this purpose, experimentation can be partially replaced by simulation, but it is still impossible to exhaustively simulate all of the combinations of modular wiring harness. This proposed approach consists of carrying out simulations using the FEM method and using their results to create regression models. Polynomial formulae can give the same information as simulations within a clearly reduced time and satisfying accuracy. An optimization algorithm introduced in this study will use them to assign new cable cross-sections of harnesses considering their currents and the ambient temperature.Custom integer optimization method for wire bundle dimensioning
http://hdl.handle.net/2117/102261
Custom integer optimization method for wire bundle dimensioning
Rius Rueda, Armand; García Espinosa, Antonio; Díaz Millán, Manuel Alberto
Automotive wiring harnesses have gained weight and
complexity through the last decades due to the increasing number
of electrical components, which has raised the interest on its
weight optimization. For this purpose, it is essential to know
at least the maximum amount of steady current that either
single wires or bundles can carry. However, the large amount
of combinations of the customer-speci¿c wire harnesses makes
it impossible to exhaustively simulate all of the combinations
that would allow for a reliable analysis and optimization of the
network. The proposed approach consists of achieving accurate
predictions of the wire thermal behaviour using fast on-line
polynomial functions, which have been created as regression
models using data from off-line worst-case ¿nite element sim-
ulations. These regression models provide good accuracy for
the critical dimensions of wire bundles in a much shorter time
than simulations, so that they can be used on-line in optimiza-
tion algorithms. Two different approaches of optimization are
presented here in order to assign discrete values of available
wire cross-section to the wire bundles: The ¿rst one uses integer
linear programming, and the second one consists of a recently
created custom algorithm whose objective is to reduce the
computation time of the integer linear programming approach.
This latter objective is satisfactorily accomplished. Results of both
optimization approaches are validated by means of ¿nal ¿nite
element simulations, and they promisingly ful¿ll the objectives
of this study.
Fri, 10 Mar 2017 09:08:15 GMThttp://hdl.handle.net/2117/1022612017-03-10T09:08:15ZRius Rueda, ArmandGarcía Espinosa, AntonioDíaz Millán, Manuel AlbertoAutomotive wiring harnesses have gained weight and
complexity through the last decades due to the increasing number
of electrical components, which has raised the interest on its
weight optimization. For this purpose, it is essential to know
at least the maximum amount of steady current that either
single wires or bundles can carry. However, the large amount
of combinations of the customer-speci¿c wire harnesses makes
it impossible to exhaustively simulate all of the combinations
that would allow for a reliable analysis and optimization of the
network. The proposed approach consists of achieving accurate
predictions of the wire thermal behaviour using fast on-line
polynomial functions, which have been created as regression
models using data from off-line worst-case ¿nite element sim-
ulations. These regression models provide good accuracy for
the critical dimensions of wire bundles in a much shorter time
than simulations, so that they can be used on-line in optimiza-
tion algorithms. Two different approaches of optimization are
presented here in order to assign discrete values of available
wire cross-section to the wire bundles: The ¿rst one uses integer
linear programming, and the second one consists of a recently
created custom algorithm whose objective is to reduce the
computation time of the integer linear programming approach.
This latter objective is satisfactorily accomplished. Results of both
optimization approaches are validated by means of ¿nal ¿nite
element simulations, and they promisingly ful¿ll the objectives
of this study.Analysis of power converters with devices of SiC for applications in electric traction systems
http://hdl.handle.net/2117/101878
Analysis of power converters with devices of SiC for applications in electric traction systems
Fernández Palomeque, Efrén Esteban; Paredes, Alejandro; Romeral Martínez, José Luis; Sala, Vicent
This article presents the analysis of two topologies
of power converters. Voltage Source Inverter (VSI) and Current
Source Inverter (CSI) proposals for traction system applications,
these topologies are implemented with silicon carbide devices.
The use of SiC semiconductors allow working at high switching
frequency (100KHz), increase the working temperature range
and decreasing power losses during conduction and activation of
the semiconductors.
The objective is analyze these topologies and select the one that
provides the best performance and behavior at high frequency
to improve it on a electric traction system.
Thu, 02 Mar 2017 16:12:15 GMThttp://hdl.handle.net/2117/1018782017-03-02T16:12:15ZFernández Palomeque, Efrén EstebanParedes, AlejandroRomeral Martínez, José LuisSala, VicentThis article presents the analysis of two topologies
of power converters. Voltage Source Inverter (VSI) and Current
Source Inverter (CSI) proposals for traction system applications,
these topologies are implemented with silicon carbide devices.
The use of SiC semiconductors allow working at high switching
frequency (100KHz), increase the working temperature range
and decreasing power losses during conduction and activation of
the semiconductors.
The objective is analyze these topologies and select the one that
provides the best performance and behavior at high frequency
to improve it on a electric traction system.Rotor of synchronous reluctance motor optimization by means reluctance network and genetic algorithm
http://hdl.handle.net/2117/101351
Rotor of synchronous reluctance motor optimization by means reluctance network and genetic algorithm
López Torres, Carlos; Michalski, Tomasz Dobromir; García Espinosa, Antonio; Romeral Martínez, José Luis
An optimal design for a rotor of SynRM is proposed on this paper. The inductances of the machine computed in dq-axes allow determining machine performance and the motor behavior. High magnetic saturation on this kind of motor increases the difficulty of inductance calculation. Hence, the finite element analysis is currently used to design and optimize SynRM, from the first instance. This method usually requires a high amount of computational time and resources. For this reason, the reluctance network here proposed is a good alternative to consider for designing these motors, because it is a fast and good method to obtain the inductances of the SynRM. Therefore, an optimal design avoiding FEA is proposed on this paper using the reluctance network to calculate the dq-axes motor inductances.
Tue, 21 Feb 2017 17:14:46 GMThttp://hdl.handle.net/2117/1013512017-02-21T17:14:46ZLópez Torres, CarlosMichalski, Tomasz DobromirGarcía Espinosa, AntonioRomeral Martínez, José LuisAn optimal design for a rotor of SynRM is proposed on this paper. The inductances of the machine computed in dq-axes allow determining machine performance and the motor behavior. High magnetic saturation on this kind of motor increases the difficulty of inductance calculation. Hence, the finite element analysis is currently used to design and optimize SynRM, from the first instance. This method usually requires a high amount of computational time and resources. For this reason, the reluctance network here proposed is a good alternative to consider for designing these motors, because it is a fast and good method to obtain the inductances of the SynRM. Therefore, an optimal design avoiding FEA is proposed on this paper using the reluctance network to calculate the dq-axes motor inductances.Transient thermal modelling of short-circuit test for conductors by means of dimensional reduction
http://hdl.handle.net/2117/100432
Transient thermal modelling of short-circuit test for conductors by means of dimensional reduction
Abomailek Rubio, Basel Carlos; Capelli, Francesca; Riba Ruiz, Jordi-Roger; Casals Torrens, Pau; Moreno Eguilaz, Juan Manuel
This paper proposes a fast and accurate method to simulate the temperature rise due to a short-circuit
condition in power conductors of aluminum based on one-dimensional reduction and the application of the finite
difference method (FDM). The method suggested discretizes the analyzed conductor into several small onedimensional
nodes or elements. To improve accuracy and speed, the transient method proposed here applies a onedimensional
approach but analyzing in each node, the three-dimensional geometry of the conductor. By this way, and
at each time-step, the convective coefficient and the incremental resistance of each node are determined and a further
energy balance is calculated, thus obtaining realistic and accurate results. Results attained by means of the proposed
method are validated against finite element method (FEM) simulations and experimental results conducted in a power
laboratory, which corroborate the usefulness and accurate results of the proposed method.
Wed, 01 Feb 2017 10:15:30 GMThttp://hdl.handle.net/2117/1004322017-02-01T10:15:30ZAbomailek Rubio, Basel CarlosCapelli, FrancescaRiba Ruiz, Jordi-RogerCasals Torrens, PauMoreno Eguilaz, Juan ManuelThis paper proposes a fast and accurate method to simulate the temperature rise due to a short-circuit
condition in power conductors of aluminum based on one-dimensional reduction and the application of the finite
difference method (FDM). The method suggested discretizes the analyzed conductor into several small onedimensional
nodes or elements. To improve accuracy and speed, the transient method proposed here applies a onedimensional
approach but analyzing in each node, the three-dimensional geometry of the conductor. By this way, and
at each time-step, the convective coefficient and the incremental resistance of each node are determined and a further
energy balance is calculated, thus obtaining realistic and accurate results. Results attained by means of the proposed
method are validated against finite element method (FEM) simulations and experimental results conducted in a power
laboratory, which corroborate the usefulness and accurate results of the proposed method.Constrained-size torque maximization in SynRM machines by means of genetic algorithms
http://hdl.handle.net/2117/98761
Constrained-size torque maximization in SynRM machines by means of genetic algorithms
López Torres, Carlos; Sala Cardoso, Enric; García Espinosa, Antonio; Romeral Martínez, José Luis
Synchronous Reluctance Motors have always been an alternative to more mainstream machines such as the Permanent Magnet Synchronous Motor, but until recently they have not found their right place in industrial applications. This progressing adoption begins with the replacement of the current solutions, but this presents the design challenge of finding a surrogate which conforms to the specifications for a given application. In order to overcome this challenge, an evolutionary design methodology for SynRM is presented. The proposed approach uses a set of design constraints to maximize the mechanical power of the motor taking into account the specified rated speed. Since the calculation of the torque of the motor is critical, an iterative method for the evaluation of iron losses has been introduced. Finally, the proposed approach is validated by means of FEM simulation and the calculation of the efficiency map of the results.
Thu, 22 Dec 2016 12:43:24 GMThttp://hdl.handle.net/2117/987612016-12-22T12:43:24ZLópez Torres, CarlosSala Cardoso, EnricGarcía Espinosa, AntonioRomeral Martínez, José LuisSynchronous Reluctance Motors have always been an alternative to more mainstream machines such as the Permanent Magnet Synchronous Motor, but until recently they have not found their right place in industrial applications. This progressing adoption begins with the replacement of the current solutions, but this presents the design challenge of finding a surrogate which conforms to the specifications for a given application. In order to overcome this challenge, an evolutionary design methodology for SynRM is presented. The proposed approach uses a set of design constraints to maximize the mechanical power of the motor taking into account the specified rated speed. Since the calculation of the torque of the motor is critical, an iterative method for the evaluation of iron losses has been introduced. Finally, the proposed approach is validated by means of FEM simulation and the calculation of the efficiency map of the results.Estimation of fuel consumption in a hybrid electric refuse collector vehicle using a real drive cycle
http://hdl.handle.net/2117/97767
Estimation of fuel consumption in a hybrid electric refuse collector vehicle using a real drive cycle
Cortez, Ernest; Moreno Eguilaz, Juan Manuel; Soriano, Francisco; Sala Cardoso, Enric
Mon, 05 Dec 2016 12:35:13 GMThttp://hdl.handle.net/2117/977672016-12-05T12:35:13ZCortez, ErnestMoreno Eguilaz, Juan ManuelSoriano, FranciscoSala Cardoso, EnricReduced scale feasibility of temperature rise tests in substation connectors
http://hdl.handle.net/2117/97533
Reduced scale feasibility of temperature rise tests in substation connectors
Abomailek Rubio, Basel Carlos; Riba Ruiz, Jordi-Roger; Casals Torrens, Pau
Due to the important increase of the power of electrical transmission and distribution grids expected for the following years, especially in developing countries such as Kenya, Brazil, Philippines or Mexico among others, that have planes of generating energy from clean sources far away from the centres of consumption [1] it becomes a matter of special importance adapting and developing new substation connectors’ testing methods according to the power and temperature regimes at which they are expected to work. The international normative frame of substation connectors established both by the International Electrotechnical Committee (IEC) [2] and the National Electrical Manufacturers Association (NEMA) [3] sets standardized tests for the evaluation of high voltage connectors. These tests are routinely done within the quality plans of the manufacturers.
At the moment, testing of substation connectors –and in general switchgear and fittings- is time demanding and costly due to the energy consumed by such tests. The expectations for the following years are that the power consumption of these tests will not do nothing but grow due to expected increase of power of worldwide overhead lines. For instance, today temperature rise tests in substation connectors involve power ranges up to 100 kVA, which are applied in cycles that can last several weeks. These tests are only feasible in few laboratories and at a very high cost: temporary, monetary, energetic and environmental. For this reason, following the line of other technologies such as aeronautics, naval engineering, or automotive as well as other studies done in the field of electrical engineering specially related to the corona effect [4], this study proposes to develop a reduced scale test system to perform temperature rise tests for substation connectors.
Both, a theoretical framework based on analytical formulas, finite element method (FEM) simulations and experimental data has been developed to conduct reduced scale temperature rise tests and to set the conditions at which they provide comparable results to those attained in the original scale tests. Firstly, two circular loops (original and reduced scale loops) composed of a power conductor and two terminal connectors were analysed. The aim of this first study was to determine in an easy and trustful way the voltage and current values to be applied in experimental reduced scale tests to achieve the same steady-state temperature as in the original scale temperature rise test. The scale relationship between tests was set in 1:1.8, although the method proposed in this study can deal with any other scale factor. This study was useful in order to have a first sight of the final results of the procedure using substation connectors.
Wed, 30 Nov 2016 15:03:08 GMThttp://hdl.handle.net/2117/975332016-11-30T15:03:08ZAbomailek Rubio, Basel CarlosRiba Ruiz, Jordi-RogerCasals Torrens, PauDue to the important increase of the power of electrical transmission and distribution grids expected for the following years, especially in developing countries such as Kenya, Brazil, Philippines or Mexico among others, that have planes of generating energy from clean sources far away from the centres of consumption [1] it becomes a matter of special importance adapting and developing new substation connectors’ testing methods according to the power and temperature regimes at which they are expected to work. The international normative frame of substation connectors established both by the International Electrotechnical Committee (IEC) [2] and the National Electrical Manufacturers Association (NEMA) [3] sets standardized tests for the evaluation of high voltage connectors. These tests are routinely done within the quality plans of the manufacturers.
At the moment, testing of substation connectors –and in general switchgear and fittings- is time demanding and costly due to the energy consumed by such tests. The expectations for the following years are that the power consumption of these tests will not do nothing but grow due to expected increase of power of worldwide overhead lines. For instance, today temperature rise tests in substation connectors involve power ranges up to 100 kVA, which are applied in cycles that can last several weeks. These tests are only feasible in few laboratories and at a very high cost: temporary, monetary, energetic and environmental. For this reason, following the line of other technologies such as aeronautics, naval engineering, or automotive as well as other studies done in the field of electrical engineering specially related to the corona effect [4], this study proposes to develop a reduced scale test system to perform temperature rise tests for substation connectors.
Both, a theoretical framework based on analytical formulas, finite element method (FEM) simulations and experimental data has been developed to conduct reduced scale temperature rise tests and to set the conditions at which they provide comparable results to those attained in the original scale tests. Firstly, two circular loops (original and reduced scale loops) composed of a power conductor and two terminal connectors were analysed. The aim of this first study was to determine in an easy and trustful way the voltage and current values to be applied in experimental reduced scale tests to achieve the same steady-state temperature as in the original scale temperature rise test. The scale relationship between tests was set in 1:1.8, although the method proposed in this study can deal with any other scale factor. This study was useful in order to have a first sight of the final results of the procedure using substation connectors.