UPCommons - E-prints UPC Universitat Politècnica de Catalunya
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 286
Grid connection control of VSC-based high power converters for wave energy applications - Mir Cantarellas, Antonio; Rakhshani, Elyas; Remón, D.; Rodríguez Cortés, Pedro
In the wave energy sector, an increasing concern
regarding the grid connection of wave energy converters is
recently being experienced, as well as in the main challenges
resulting from the grid integration of large scale wave power
plants. This increasing interest arise due to the near-commercial
developments of several wave energy converter devices, which
have already proved its hydrodynamic and power take-off
performance. Therefore, this paper proposes a suitable power
processing system configuration and its suitable control design
used for interfacing the grid connection of such high power wave
energy converters while ensuring acceptable grid connection
standards compliance. An advanced filter topology will be
introduced based on the superposition of LCL+Trap filters...
Analysis of ferroresonance effects in distribution networks with distributed source units - Monadi, Mehdi; Luna Alloza, Álvaro; Candela García, José Ignacio; Rocabert Delgado, Joan; Fayezizadeh, Mostafa; Rodríguez Cortés, Pedro
The connection of Distributed Generation (DG) units
to existing networks may give rise to harmful effects on the
network and the DG units itself. Therefore, due to increasing
penetration of DG units, it is important to consider these effects
in order to avoid some of harmful events. Ferroresonance is one
of these destructive phenomena. Over voltages due to this
phenomena can damage devices which are connected to the
network. In DG systems, due to the use of capacitor banks which
are used for VAR compensation, grid connection filters, etc.
ferroresonance may appear. Also, special operations like
islanding, may lead these systems to ferroresonance. In
traditional systems ferroresonance normally appear after there...
Control of grid-connected power converters based on a virtual admittance control loop - Rodríguez Cortés, Pedro; Candela García, José Ignacio; Citro, Costantino; Rocabert Delgado, Joan; Luna Alloza, Álvaro
The connection of electronic power converters to the electrical network is increasing mainly due to
massive integration of renewable energy systems. However, the electrical dynamic performance of
these converters does not match the behavior of the network, which is mainly formed by generation
facilities based on big synchronous generation systems. Depending on the desired electrical operation
mode different control structures can be implemented in the converters in order to get adapted with the
grid conditions. However, changing between different control structures and operation is not an
optimal solution, as the resulting system results complex and is not highly robust. As an alternative,
this paper presents a new...
Control of PV generation systems using the synchronous power controller - Rodríguez Cortés, Pedro; Candela García, José Ignacio; Luna Alloza, Álvaro
The high penetration of distributed generation, as
PV or wind power, has forced the Transmission System
Operators (TSOs) to set restrictive requirements for the
operation of such systems. As it can be extracted from the
forthcoming grid codes drafts, the future distributed
generation systems will be requested to have the equivalent
performance of a synchronous generator, which is seen from
the TSOs as the only solution if a massive integration of
renewable in the electrical network should be achieved. In this
paper a method for controlling PV grid connected power
converters as a synchronous generator, namely Synchronous
Power Controller (SPC), is presented. As a difference with
previous works this method permits to...
Modeling and control of multi modular converters using optimal LQR controller with integral action - Rakhshani, Elyas; Mir Cantarellas, Antonio; Remón, D.; Rodríguez Cortés, Pedro; Candela García, José Ignacio
A new application of LQR controller with the ability
of reference tracking for a multi modular converter with
several cells is proposed. First, the mathematical model for the
grid connected MMC is presented and then, the small signal
state space model is obtained. MMC is a very complex MIMO
system with several state variables and global control for this
system is very important issue. Optimal advanced controller
based on linear quadratic regulator with integral action is a
very good candidate for controlling the AC signals and energy
balancing in multi cells MMC system. The performance and
validity of obtained model and designed linear controller are
evaluated with non-linear model of MMC...
Design of the LCL+trap filter for the two-level VSC installed in a large-scale wave power plant - Mir Cantarellas, Antonio; Rakhshani, Elyas; Remón, D.; Rodríguez Cortés, Pedro
This paper presents a methodology for designing
the link passive filter of the power converters installed in a
multi-megawatt wave power plant. Such filter is based on the
superposition of both LCL and trap filter configurations with
the purpose of achieving enhanced grid interaction of a twolevel
voltage source converter. The LCL+Trap filter design is
highly dependent on the electrical network characteristics;
hence the distribution system of the plant is introduced in the
paper to take into account its effects on the tuning parameters.
The proposed LCL+trap filter topology arises as a successful
alternative solution for the conventional LCL filter topology,
thanks to its improved filtering capability while ensuring a
Analysis on capability of harmonic damping using active filter acting as resistive harmonic impedance - Hasan, Khurshid N Md; Luna Alloza, Álvaro; Candela García, José Ignacio; Rodríguez Cortés, Pedro
This paper presents the analysis of shunt active
filter (SAF) in harmonic damping. SAF with voltage-based
detection control act as an active damping and able to
attenuate harmonic propagation throughout the power
distribution network. The active filter is implemented on two
different power line networks to assess its practicality in
different network configuration. The first network is 220-V
distribution power line and the second network is the reduced
equivalent WPP network of 150-kV, 444.4-MVA. Assessment
on the best place for active filter implementation is supported
by using harmonic resonance mode analysis method.
Implementation of grid-connected to/from off-grid transference for micro-grid inverters - Heredero Peris, Daniel; Chillón Antón, Cristian; Pages Gimenez, Marc; Gross, Gabriel Igor; Montesinos Miracle, Daniel
This paper presents the transfer of a microgrid
converter from/to on-grid to/from off-grid when the converter
is working in two different modes. In the first transfer presented
method, the converter operates as a Current Source Inverter
(CSI) when on-grid and as a Voltage Source Inverter (VSI) when
off-grid. In the second transfer method, the converter is operated
as a VSI both, when operated on-grid and off-grid. The two
methods are implemented successfully in a real platform but the
later offers some advantage.
A novel approach for voltage control of multi-terminal DC grids with offshore wind farms - Rouzbehi, Kumars; Miranian, Arash; Luna Alloza, Álvaro; Rodríguez Cortés, Pedro
This paper proposes a novel control strategy in multi-terminal DC (MTDC) grids with offshore wind generation based on the idea of generalized voltage droop (GVD). In the
proposed strategy, the GVD characteristics are assigned to the voltage-regulating converter station, enhancing their control
maneuverability and enabling them to perform necessary DC voltage control and power sharing tasks. By adjusting the
coefficients of the corresponding GVD characteristic, a converter station can be operated in three operating modes, namely (1)
fixed active power control mode, (2) conventional voltage droop control mode or (3) fixed DC voltage control mode. Results of
simulations on a test four-terminal DC grid including...
Induction heating of liquids with an L-LC resonant tank - Quirós Jacobo, Francisco Javier; Martín Segura, Guillermo; Heredero Peris, Daniel; Montesinos Miracle, Daniel
Induction heating (IH) systems are used in many applications because they
present many advantages compared other heating methods like quicker heating or
faster start-up. This paper studies the application of IH systems for liquid heating
using an L-LC resonant tank.
Root locus rules for polynomials with complex coefficients - Dòria Cerezo, Arnau; Bodson, Marc
Applications were found recently where the analy-
sis of dynamic systems with a special structure could be simp
fied considerably by transforming them into equivalent syst
having complex coefficients and half the number of poles. The
design of controllers for such systems can be simplified in th
complex representation, but requires techniques suitable
systems with complex coefficients. In the paper, the extensi
of the classical root locus method to systems with complex
coefficients is presented. The results are applied with some
advantages to a three-phase controlled rectifier.
Design, management and comissioning of a utility connected microgrid based on IEC 61850 - Ruiz Alvarez, A.; Colet Subirachs, A.; Gomis Bellmunt, Oriol; Fernández Mola, José María; Alvarez Cuevas, F.; López Mestre, Joaquim; Sudrià Andreu, Antoni
This paper presents an approach to microgrid
automation. The microgrid is composed of three different nodes connected to the public electric grid, which are hardware
emulated with back-to-back converters. The microgrid is a flexible and weather independent test bed for testing different
control algorithms. The intelligence of the automation system is split in three hierarchical layers: the RMU layer, the iNode
layer and the iSocket layer. Communications among iNode and iSockets are according IEC 61850 standard.
The aims of the project is to comission a set of technologies and acquire experience in microgrid automation, IEC 61850
communications and power control algorithms in DER systems.
Control of a utility connected microgrid - Colet Subirachs, A.; Ruiz Alvarez, A.; Gomis Bellmunt, Oriol; Alvarez Cuevas, F.; Sudrià Andreu, Antoni
This paper describes the control algorithm of a utility connected microgrid, based on independent control of active and reactive power (PQ control) and working in centralized
operation mode. The microgrid under investigation is composed of three configurable units: a generation unit, a storage unit and a load. These units are interfaced with the microgrid through a
Voltage Source Converter (VSC) and are controlled by the nodes of the communication system by means of IEC 61850. A set of
tests have been conducted to evaluate the microgrid behavior.
A sensorless stable V/f control method for a five-phase PMSM - Sala Pérez, Pau; Galcerán Arellano, Samuel; Montesinos Miracle, Daniel
This paper presents a sensorless and stable control method for a five-phase permanent magnet synchronous motor (PMSM). At first, a model of a five-phase PMSM is presented. After that a stability study has been performed by the analysis of the eigenvalues of the state transition matrix of the linearized PMSM model about an operating point. The results show that the machine speed response is unstable for input frequencies below the machine rated frequency. Finally, an open-loop V/f stabilization algorithm which ensures the stability of the system over a wide range of speed is presented.
Electric drives for e-light e-scooters - Andrada Gascón, Pedro; Blanqué Molina, Balduino; Martínez Piera, Eusebio; Torrent Burgués, Marcel; Sánchez López, José Antonio; Perat Benavides, Josep Ignasi
In the next years is expected an important rise in sales of electrical scooters in the entire world but especially in China. In order to address this challenge the electric scooter industry has to be more competitive in the transportation market and therefore important improvements, in terms of energy density and costs, have to be done in the electric storage system and in the electric propulsion system. In this paper, an analytical and experimental comparison of two different drives for electric scooters is carried out. Both are permanent magnet synchronous outer rotor motor drives but one placed inside the rear...
Solid state transformer with low-voltage ride-through and current unbalance management capabilities - Alepuz Menéndez, Salvador; González, Francisco; Martín-Arnedo, Jacinto; Martínez Velasco, Juan Antonio
The solid state transformer is an emerging
technology which aims at replacing the conventional lowfrequency power transformer by means of a high-frequency transformer driven by a proper AC/AC power electronics
conversion system, at both transformer sides. In comparison with the conventional power transformer, the solid state transformer provides extended and enhanced operating capabilities that can be achieved with an appropriate controller design for the power electronics converters. In this work, the interaction of the solid state transformer with a distribution system is analyzed under different operating conditions. Bidirectional active power flow,
full reactive power control, low-voltage side current unbalance management and high-voltage side...
Magnet shape influence on the performance of AFPMM in a torus configuration - Saavedra Ordóñez, Harold; Riba Ruiz, Jordi-Roger; Hernández Guiteras, Joan; Romeral Martínez, José Luis
The axial flux permanent magnet machine (AFPMM)is being increasingly demanded for special applications, particularly for transportation systems and concretely for inwheel applications. In this paper the effect of the magnets shape on the AFPMM performance has been analyzed by means of 3DFEM simulations. To this end the air-gap magnetic flux density, the back electromotive force (back-EMF), the cogging torque and the total torque waveforms of the analyzed AFPMMs with different magnets geometries have been studied and compared.
The harmonic content of all these variables has been also analyzed. These analyses are carried out to find out the more suitable geometry for...