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rss_1.0 Recursos de colección

UPCommons - E-prints UPC Universitat Politècnica de Catalunya (63.328 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 300

1. 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...

2. 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...

3. 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...

4. 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...

5. Decentralized control of MTDC networks with energy storage and distributed generation - Gavriluta, Catalin; Candela García, José Ignacio; Citro, Costantino; Luna Alloza, Álvaro; Rodríguez Cortés, Pedro
Multi-terminal dc (MTDC) networks are drawing a lot of interest lately in applications related to distributed generation, especially in those that integrate energy storage. Several approaches for controlling the operation of such systems have been proposed in the literature; however the existing structures can be significantly enhanced. This paper proposes an improved primary control layer, based on droop and dc-bus signaling to serve as a base framework for implementing a hierarchical control structure in a MTDC system. As it will be further discussed in this work, five operating bands as well as various droop characteristics for different elements connected to...

6. Magnet shape influence on the performance of AFPMM with demagnetization - Saavedra Ordóñez, Harold; Riba Ruiz, Jordi-Roger; Romeral Martínez, José Luis
In this paper the effect of the magnets shape on the AFPMM performance under a demagnetization fault has been analyzed by means of 3D-FEM simulations. Demagnetization faults in permanent magnet synchronous motors (PMSMs) may generate specific fault harmonic frequencies in the stator currents, output torque and the zero-sequence voltage component (ZSVC) spectra the ones can affect motor behavior, and so these parameters have been studied and compared, for each magnet configuration in each condition. These analyses are carried out to find out the more suitable geometry for an operation under healthy and faulty condition.

7. Sliding mode control of a single-phase LCL full-bridge rectifier - Biel Solé, Domingo; Dòria Cerezo, Arnau; Fossas Colet, Enric
This paper presents a dynamic analysis and the control design for a singe-phase full bridge recti¿er with a LCL ¿lter. The control algorithm is based on the sliding mode control techniques that provides good tracking performances and robustness against parameter variations. The control design also considers the connection to a non ideal power network with a grid impedance as well as higher harmonics components in the voltage. The control law has been tested in numerical simulations with satisfactory results (also in the case of non ideal power grid).

8. Control en modo deslizante de un rectificador monofásico con un filtro LCL - Biel Solé, Domingo; Dòria Cerezo, Arnau; Fossas Colet, Enric
En este artículo se presenta el análisis dinámico y el diseño de un controlador para un rectificador monofásico controlado con un filtro LCL. El algoritmo de control está basado en las técnicas de modos deslizantes que permiten unas buenas prestaciones de seguimiento y robustez en los convertidores de potencia. Durante el diseño se ha considerado la conexión a una red débil y con fuerte contenido armónico. La ley de control se ha validado mediante simulaciones numéricas con resultados satisfactorios incluso en casos de una red no ideal.

9. A Monte Carlo approach for distribution reliability assessment considering time varying load and system reconfiguration - Martínez Magaña, Juan; Guerra Sánchez, Luis Gerardo
This paper presents the basic features of a sequential analytical Monte Carlo approach for reliability evaluation of distribution systems. The document includes a description of the procedure, implemented in an open environment in which OpenDSS is driven from MATLAB, and some simulation results derived from the analysis of an overhead distribution test system.

10. Exploring the range of impedance conditioning by virtual inductance for grid connected voltage source converters - Suul, Jon Are; Molinas Mata, Pau; Rodríguez Cortés, Pedro
Conditioning of network impedance by insertion of a virtual inductance as an inherent feature of the converter control system has the potential to extend the range of stable operation of the overall system. This paper presents a scenario in which such potential is explored and its range of application is identified. It shows first that implementation of a virtual inductance is naturally suited for combination with Virtual Flux-based control systems, and that it can be extended to the more general case of a virtual reactance. The paper then presents the structure of a control system for operation under unbalanced conditions,...

11. Analysis and comparison of battery energy storage technologies for grid applications - SAEZ-DE-IBARRA, A.; Milo, Aitor; Gaztañaga, Haizea; Etxeberria Otadui, Ion; Rodríguez Cortés, Pedro; Bacha, Seddik; Debusschere, V.
Battery Energy Storage Systems (BESSs) could contribute to the generation/consumption balance of the grid and could provide advanced functionalities at different grid levels (generation, T&D, end-user and RES integration). In this paper an analysis and comparison of Battery Energy Storage (BES) technologies for grid applications is carried out. The comparison is focused on the most installed technologies in the recent experimental BESS installations. Furthermore, the paper presents a new methodology aimed at selecting the most suitable BES technology for a specific grid application. This methodology defines a priority level for each technical and economical characteristic of the BES technologies. Finally, the proposed methodology is applied for a specific grid application confirming its contribution...

12. Design of AC-DC power converters with LCL + tuned trap line filter using Si IGBT and SiC MOSFET modules - Piasecki, S.; Mir Cantarellas, Antonio; Rabkowski, J.; Rodríguez Cortés, Pedro
This paper presents a method for improving the design procedure of AC-DC power converters for power generation applications. The proposed methodology is based on selection of the most convenient configuration, in terms of switching frequency and design of the line filter, in order to minimize the overall losses in the system. In this work two types of semiconductor devices are considered: silicon IGBT and silicon carbide MOSFET for the design of a 100 kVA system, and they performance is compared. The AC-DC converter parameters, the design methodology and preliminary simulation results for representatives of Si IGBT and SiC MOSFET modules are presented.

13. Grid harmonic detection and system resonances indentification in wave power plant applications - Nisak, Khairul; Mir Cantarellas, Antonio; Luna Alloza, Álvaro; Candela García, José Ignacio; Rodríguez Cortés, Pedro
There is a growing interest in electrical grid connection of single unit Wave Energy Converters (WECs), as well as the multiple units based Wave Power Plant (WPP) applications. Due to the increasing integration of high power converters in WPP, additional concerns on the harmonic current mitigation of WEC device arise which requires the grid filter installation. Furthermore, the identification and appropriate mitigation of additional harmonics at the WPP level is needed, as any inductances and capacitors of the WPP can interact with the resonant frequency of the entire system and lead to detrimental effects on equipment. The present paper focuses on the potential harmonic studies of a realistic proposed WPP layout,...

14. Control of an active rectifier with an inductive-capacitive-inductive filter using a twisting based algorithm - Dòria Cerezo, Arnau; Puleston, Paul; Kunusch, Cristian
This paper presents a novel controller for an active rectifier with an inductive-capacitive-inductive filter. The proposed control scheme comprises two levels. The internal level, is a current controller based on the second order sliding mode Twisting algorithm, which robustly ensures an unity power factor at the connection point. The slower external level is a PI controller in charge of regulating the output DC voltage to a desired reference. The controller setup also includes a finite-time observer of the current derivative that can be used to avoid direct (and sometimes problematic) numerical differentiation. Finally, simulation results are presented to validate the proposed control scheme.

15. 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...

16. 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...

17. 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...

18. Deep offshore wind farm planning and cost calculation tools - Perez, German; Lopez Mendia, Joseba; Val, Laura; Sumper, Andreas; Schuon, Frieder; de Prada, Mikel; Aragües, Monica; Lopes, Helder; Ergun, Hakan; van Hertem, Dirk
Postprint (published version)

19. 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...

20. 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...

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