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.
Modeling and validation of a flywheel energy storage lab-setup - Diaz Gonzalez, Francisco; Sumper, Andreas; Gomis Bellmunt, Oriol; Villafafila Robles, Roberto
This work deals with the modeling, control and experimental validation of a flywheel test bench which is part of IREC’s lab-scale microgrid. The storage device has been
designed as a proof of concept. It is based on a low-speed rotating disk mechanically coupled to a Permanent Magnet Synchronous
Machine. The electrical power is exchanged with the external grid by means of a set of back-to-back power converters. These
power electronics control the speed of the machine, and thus the active power absorbed or injected by the device, and also
regulate the reactive power at the point of common coupling with the external grid. Vector...
Passive and Active Methods of Islanding for PV systems - Skocil, Tomas; Gomis Bellmunt, Oriol; Montesinos Miracle, Daniel; Galcerán Arellano, Samuel; Rull Duran, Joan
This paper presents a review of some techniques for islanding detection, especially by using inverter based DG applications and it also focuses on several islanding detection methods for a single- phase current-control voltage inverter working with a PV system connected into the grid. It is deliberated a single-phase inverter with maximum power of 5 kW. Islanding detection methods are investigated, simulated and evaluated in MATLAB / SIMULINK.
Requirements for EV charge stations with photovoltaic generation and storage - Cairó, Ignasi; Sumper, Andreas
With the increase in electric mobility, public and private charge facilities will be required to provide solutions adjusted to the actual needs and requirements. A new
methodology for dimensioning charge stations for electric vehicles (EVs) is presented in this paper. Such proposal is based on the Markov chains, and uses as output rates, the capabilities of the charge station in providing energy from the sun through
photovoltaic generation, stored energy in local batteries and also as a back-up the power grid. A numerical result is also presented for a better understanding of the process.
Multichannel high-power high-frequency converters for induction heating - Martín Segura, Guillermo; Sala Pérez, Pau; Montesinos Miracle, Daniel; Ferrater Simón, Coia; López Mestre, Joaquim
This paper studies a converter structure based on the connection of basic topologies to form
a multichannel converter for induction heating applications. The aim of using basic topologies
is to provide a reduction of design time, the cost derived from higher volume production, stock
components and installation and maintenance work. First, the aim of the paper is introduced,
afterwards the topology is discussed and then implemented
Grid-connected to/from off-grid transference for micro-grid inverters - Heredero Peris, Daniel; Chillón Antón, Cristian; Pages Gimenez, Marc; Gross, Gabriel; Montesinos Miracle, Daniel
This paper compares two methods for controlling the on-line transference from connected to stand-alone
mode and vice versa in converters for micro-grids. The first proposes a method where the converter
changes from CSI (Current Source Inverter) in grid-connected mode to VSI (Voltage Source Inverter) in
off-grid. In the second method, the inverter always works as a non-ideal voltage source, acting as VSI,
using AC droop control strategy.
Multilevel modular DC/DC converter for regenerative braking using supercapacitors - Massot Campos, Miquel; Montesinos Miracle, Daniel; Bergas Jané, Joan Gabriel; Rufer, Alfred
Regenerative braking is presented in many electric traction applications such as electric and hybrid vehicles, lifts and
railway. The regenerated energy can be stored for future use, increasing the efficiency of the system. This paper outlines the benefits of the MMC (modular multilevel converter) in front of the cascaded or series connection of converters to achieve high voltage from low voltage storage elements such as supercapacitors. The paper compares three different solutions and shows that the MMC can benefit from weight and volume reduction of the output inductance when shifted switching modulation strategy is used. Using this modulation strategy, not only...
Dimensioning electric charging posts for PEV - Cairó, Ignasi; Cruz, Miguel; Sumper, Andreas
This paper represents a new analysis method for the estimation of the required charging infrastructure for the electric vehicles (EV’s). The study is based on a real metropolitan area, taking real data from transport habits, and a prediction of certain degree of penetration of EV’s. To cope with this analysis, is the application of powerful tools, used for example in telecommunication systems such as Markov chains, and applied here into EV’s necessities and charging stations infrastructures. This theory is applied in a real example to provide more insight on how can be applied in real circumstances.
Energy management system of hybrid microgrid with energy storage - Marzband, Mousa; Sumper, Andreas; Chindris, Mircea; Tomoiaga, Bogdan
The economic scheduling of the generation units is playing a significant role in the energy management of the hybrid stand alone microgrid. Energy storage is an increasingly important part of the renewable energy sector because of the need to store power during peak production times for use in off-peak periods. This paper describes an energy
management system (EMS) for an islanded microgrid (MG) comprising wind energy conversion system (WECS),photovoltaic (PV), energy storage (ES) system, and microturbine (MT) for calculating the battery charging price (BCP) factor. To reach this objective, firstly the battery system has been modeled using the presented equations then...
Fault tolerant NPC converter control for isolated PV sytems: Application for an isolated telecommunication center - Ben Abdelghani, Hafedh; Bennani Benabdelghani, Afef; Slama Belkhodja, I.; Montesinos Miracle, Daniel
Continuity operating within isolated
telecommunication sites is an important challenge. In this paper, a new fault tolerant SVM (Space Vector Modulation) strategy for 3level NPC (Neutral point Clamped) inverter used in isolated
telecommunication sites is proposed. It inssures a continuous operation of the laod after a breakdown of an inverter power
switch. Simulation results prove the good performances of the proposed srategy
Power system stabiliser capability of offshore wind power plants - Domínguez García, José Luís; Gomis Bellmunt, Oriol; Bianchi, Fernando Daniel; Sumper, Andreas; Sudrià Andreu, Antoni
Nowadays, wind power generation is being located offshore because of its higher wind speed at lower height and larger installation zones in comparison with onshore technologies.
Recently, the concept of wind power plant has been introduced as a result of the increment of wind power penetration in
power systems. Transmission system operators are requiring wind power generation to help to power system with some ancillary services such as fault ride through or power system
stabiliser capability. Therefore, it is important to study power system stabiliser capability of wind power plants. In this paper, a comparison of various power system stabiliser schemes is presented....
Object oriented backward/forward algorithm for unbalanced and harmonic polluted distribution systems - Tomoiaga, Bogdan; Chindris, Mircea; Sudrià Andreu, Antoni; Sumper, Andreas
The optimization in the operation of distribution
electric systems has become an acute problem. In order to
evaluate some essential criteria (e.g., active power losses) the
computation of power flow is absolutely necessary. Taking into
account the real operating conditions (unbalance, harmonics) it is
of great interest for accurate steady state estimation. The existent
solutions proposed in literature are complex and it is difficult to
implement them in unbalanced and harmonic polluted systems.
By the original adaptation of the backward/forward sweep
algorithm, the authors propose a novel paradigm to analyze the
propagation of asymmetries and harmonic distortions through
radial electric networks.
Control for power conditioner based PEM fuel cell and back-up power system with supercapacitor - Trujillo Caballero, Juan Carlos; Gomis Bellmunt, Oriol; Montesinos Miracle, Daniel; Sumper, Andreas; Sudrià Andreu, Antoni; Junyent Ferré, Adrià
This paper presents a new control strategy to operate a Proton Exchange Membrane Fuel Cell (PEMFC) 1,2 kW and supercapacitor (SC) through a hybrid converter proposed. The Fuel Cell (FC) has a slow dynamic device by its nature; therefore it is recommended to have an additional auxiliary power such as the SC to improve system performance in all its applications. So has been made a study of the DC/DC converters as well as control strategies employed recently used to operate the FC and SC system. This paper shows an experimental validation of the system which has been simulated in Matlab-Simulink....
Control scheme of three-level H-bridge converter for interfacing between renewable energy resources and AC grid - Pouresmaeil, Edris; Montesinos Miracle, Daniel; Gomis Bellmunt, Oriol
This paper presents a control strategy of multilevel converters for integration of renewable energy resources into power grid. The proposed technique provides compensation for active, reactive, and harmonic current components of grid-connected loads. A three-level H-bridge converter is proposed as the interfacing system between renewable energy resources and utility grid. High performance of the proposed technique is indicated with injection of maximum available power from renewable energy
resources to the power grid, increases power factor of the utility grid, and reduces the total harmonic distortion (THD) of grid current through Matlab/Simulink under proposed operating conditions.