There has recently been considerable interest in applying Total Variation regularization with an ' 1 data fidelity term to the denoising of images subject to salt and pepper noise, but the extension of this formulation to... more
There has recently been considerable interest in applying Total Variation regularization with an ' 1 data fidelity term to the denoising of images subject to salt and pepper noise, but the extension of this formulation to more general prob- lems, such as deconvolution, has received little attention. We consider this problem, comparing the performance of ' 1 - TV deconvolution,
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In this paper, a methodology for the optimal management of a combined irrigation and water supply system based on model predictive control (MPC) is proposed. A control-oriented modelling methodology for this type of systems is presented... more
In this paper, a methodology for the optimal management of a combined irrigation and water supply system based on model predictive control (MPC) is proposed. A control-oriented modelling methodology for this type of systems is presented as well. MPC is used to generate flow control strategies from the sources to the consumer and irrigation areas to meet future demands with appropriate flows, optimizing operational goals such as network safety volumes in dams and flow control stability in actuators (valves, gates and pumps). The case study of Guadiana river is used to exemplify and verify the proposed optimal management methodology. Results have shown the effectiveness of the proposed modelling and control methodologies.
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... much lower than in higher levels of the network, eg, in an access or a core router. ... node degrees that follow the distribution of per-household wire-less networks in a residential area, as ... a wireless channel capacity of 12 Mbps... more
... much lower than in higher levels of the network, eg, in an access or a core router. ... node degrees that follow the distribution of per-household wire-less networks in a residential area, as ... a wireless channel capacity of 12 Mbps between a client and its home gateway, and, based ...
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Research Interests: Multidimensional Scaling, Water quality, Principal Component Analysis, Biomass, Archives, and 14 moreRivers, Multidisciplinary, Quality Assurance, Animals, Cluster Analysis, Basque country, Coefficient of Variation, Oligochaeta, Control chart, Water Quality, Biological Assay, Geologic Sediments, Benthic Communities, and Control Group
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Abstract This work exploits the decoupled double synchronous reference frame PLL (DDSRF-PLL) as an effective method for grid synchronization of WT's power converters in the presence of transient faults in the grid.... more
Abstract This work exploits the decoupled double synchronous reference frame PLL (DDSRF-PLL) as an effective method for grid synchronization of WT's power converters in the presence of transient faults in the grid. The DDSRF-PLL uses a dual synchronous ...
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Abstract The distributed power generation based on renewable energy sources such as wind and sun experiences a high penetration in the power systems around the world, having in some countries a large contribution to the total energy... more
Abstract The distributed power generation based on renewable energy sources such as wind and sun experiences a high penetration in the power systems around the world, having in some countries a large contribution to the total energy production. In order to protect the ...
Research Interests: Power System, Renewable energy resources, Distributed System, Control Systems, Power Plant, and 11 morePower System Protection, renewable Energy sources, Industrial, Wind turbine, Power Generation, Transmission Systems, Reactive Power, Power Control, Energy Production, Control Strategy, and Distributed Power Generation
Linear and Nonlinear Control of Distributed Power ... behavior in transient operation such as step in current reference and single phase fault in the ... I. INTRODUCTION DISTRIBUTED Power Generation Systems (DPGS) based on renewable... more
Linear and Nonlinear Control of Distributed Power ... behavior in transient operation such as step in current reference and single phase fault in the ... I. INTRODUCTION DISTRIBUTED Power Generation Systems (DPGS) based on renewable energies are not anymore regarded as ...
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... are the voltage and respectively current variations at the point of common coupling and vs is the voltage of ... loop is implemented in αβ stationary reference frame employing proportional-resonant (PR) controllers with harmonic... more
... are the voltage and respectively current variations at the point of common coupling and vs is the voltage of ... loop is implemented in αβ stationary reference frame employing proportional-resonant (PR) controllers with harmonic compensator for ... impedance algorithm identification ...
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... The detection is 4 times faster as compared with the standard demands for PV systems and 200 times faster 1611 ... The utilization of PLL for grid synchronization has been investigated in several previous studies but the extension of... more
... The detection is 4 times faster as compared with the standard demands for PV systems and 200 times faster 1611 ... The utilization of PLL for grid synchronization has been investigated in several previous studies but the extension of this algorithm to grid monitoring has not been ...
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Research Interests: Treatment Outcome, Stents, Prospective studies, Humans, Female, and 13 moreMale, Acute Myocardial Infarction, Aged, Middle Aged, Acute Coronary Syndrome, Coronary Angiography, Adult, Coronary heart disease, Public health systems and services research, Data Consistency, Heart Transplantation, Unstable Angina, and The American
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Large offshore wind power plants may have multi-MW wind turbine generators (WTG) equipped with full-scale converters (FSC) and voltage source converter (VSC) based high voltaage direct-current (HVDC) transmission for grid connection. The... more
Large offshore wind power plants may have multi-MW wind turbine generators (WTG) equipped with full-scale converters (FSC) and voltage source converter (VSC) based high voltaage direct-current (HVDC) transmission for grid connection. The power electronic converters in the WTG-FSC and the VSC-HVDC allow fast current control in the offshore grid. This paper presents a method of controlling the negative sequence current
Research Interests: Power Electronics, Wind Power, Reactive Power, Oscillations, Wind Turbines, and 11 moreElectromagnetic Transients, Second Order, Interdisciplinary Engineering, Wind Power Plant, Simulation Model, Electrical And Electronic Engineering, High Voltage Direct Current, Voltage Source Converter, Direct Current, Wind Power Generation, and Voltage Control
This letter introduces a new series of multilevel (ML) converters based on the ML clamping concept. By applying this technique, a ML clamping unit (MCU) conveys additional levels for synthesizing the output waveforms of a diode-clamped ML... more
This letter introduces a new series of multilevel (ML) converters based on the ML clamping concept. By applying this technique, a ML clamping unit (MCU) conveys additional levels for synthesizing the output waveforms of a diode-clamped ML dc–ac power converter. The basic building block of the ML clamping scheme is the ML clamping cell, which is composed of a pair
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Wind turbine power capability is an essential set of data for both wind turbine manufacturers/operators and transmission system operators since the power capability determines whether a wind turbine is able to fulfill transmission system... more
Wind turbine power capability is an essential set of data for both wind turbine manufacturers/operators and transmission system operators since the power capability determines whether a wind turbine is able to fulfill transmission system reactive power requirements and how much it is able to provide reactive power support as an ancillary service. For multimegawatt full-scale wind turbines, power capability depends
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This paper addresses a detailed design of a wind power plant and turbine slope voltage control in the presence of communication delays for a wide short-circuit ratio range operation. The implemented voltage control scheme is based upon... more
This paper addresses a detailed design of a wind power plant and turbine slope voltage control in the presence of communication delays for a wide short-circuit ratio range operation. The implemented voltage control scheme is based upon the secondary voltage control concept, which offers fast response to grid disturbances, despite the communication delays, i.e., this concept is based on a
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Zinc has been shown to have beneficial effects in vitro on epithelial barrier function, and in vivo to reduce intestinal permeability in malnourished children with diarrhoea. To determine whether malnutrition alters intestinal... more
Zinc has been shown to have beneficial effects in vitro on epithelial barrier function, and in vivo to reduce intestinal permeability in malnourished children with diarrhoea. To determine whether malnutrition alters intestinal paracellular permeability, and whether zinc prevents such alterations. Guinea pigs were fed a normal protein diet (NP group), a low protein diet (LP group), or a low protein diet enriched with 1800 ppm zinc (LPZn group) for three weeks. Intestinal permeability was measured on jejunal segments mounted in Ussing chambers by measuring ionic conductance and mucosal to serosal fluxes of 14C-mannitol, 22Na, and horseradish peroxidase. Tight junction morphology was assessed on cryofracture replicas. Mannitol and Na fluxes and ionic conductance increased in the LP group compared with the NP group but remained normal in the LPZn group. Accordingly, jejunal epithelia from the LP group, but not from the LPZn group, showed a small decrease in number of tight junctional strands compared with epithelia from the NP group. Neither malnutrition nor zinc treatment modified horseradish peroxidase fluxes. Malnutrition is associated with increased intestinal paracellular permeability to small molecules, and pharmacological doses of zinc prevent such functional abnormality.
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ABSTRACT The main goal of this paper is to motivate why the press-pack Insulated Gate Bipolar Transistor (IGBT) is a reliable solution for Medium Voltage (MV) multi-megawatt Wind Turbine (WT) power converters. Reliability is becoming more... more
ABSTRACT The main goal of this paper is to motivate why the press-pack Insulated Gate Bipolar Transistor (IGBT) is a reliable solution for Medium Voltage (MV) multi-megawatt Wind Turbine (WT) power converters. Reliability is becoming more and more important nowadays when both the size and number of installed WTs is continuously increasing. Multi-level (ML) power converters could offer numerous advantages over the classical two level power converters in MV applications such as reduced semiconductor power losses, reduced harmonic distortion and reduced dv/dt. This paper basically represents a survey on high power IGBT modules and the Al wire-bonded, the Cu wire-bonded, the SKiN flex layer and the press-pack IGBT modules are analyzed from the packaging and reliability point of view. It is concluded that press-pack IGBT modules represent a reliable solution for multi-megawatt wind turbine power converters not only because of better power cycling capability than Al wire-bonded IGBT modules but also because of features such as dual sided cooling and short circuit failure mode.
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... Overall power output of the WPP is badly affected as long as the fault persists, as the net power output of the falls to negative levels ... Therefore, the SOGI-QSG and proportional resonant controllers can be tuned to the offshore... more
... Overall power output of the WPP is badly affected as long as the fault persists, as the net power output of the falls to negative levels ... Therefore, the SOGI-QSG and proportional resonant controllers can be tuned to the offshore grid frequency and there is no need of any frequency ...