Search results for: C Nichita
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In this paper, least square support vector machines (LS-SVM) intelligent technique is proposed for the control of a wind energy system based on permanent magnet synchronous generator (PMSG). The proposed LS-SVM is “trained” off-line to forecast at each wind speed the optimal duty cycle which is considered as control variable. In order to maximize wind turbine generated power, an inserted DC/DC power...
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Alimentary Pharmacology & Therapeutics > 39 > 5 > 507 - 517
BackgroundEarly detection and treatment of colorectal adenomatous polyps (AP) and colorectal cancer (CRC) is associated with decreased mortality for CRC. However, accurate, non‐invasive and compliant tests to screen for AP and early stages of CRC are not yet available. A blood‐based screening test is highly attractive due to limited invasiveness and high acceptance rate among patients.
AimTo demonstrate...
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This paper is a contribution to the development of real time emulators, applied for marine current energy conversion. The main components of the emulator are: an electromechanical sub-system (ES) and an informatics subsystem (IS); structure based on "hardware-in the-loop" (HILS) simulation techniques. The ES is composed from three electrical drives: an asynchronous machine that emulates...
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This paper presents a careful study related to a more efficient energy management between lithium battery (with rated voltage of 24V) and Ultracapacitors (UC) for Hybrid Electric Vehicle (HEV) applications. This association is due to the present trend in the field, knowing that the major drawback of the HEV is the autonomy problem. Thus, using the Hybrid energy source (such as UC + battery) and with...
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In this paper, strategies of short and long term fluctuations mitigation are applied to a wind-diesel hybrid system. Ultracapacitors (UC) and batteries are operated in a complementary mode. The DC-bus voltage is maintained at a constant value by the diesel engine while providing a smoothed current. The proposed strategies are based on the wind power frequencies distribution between the storage devices...
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This paper presents the development of a real time marine current turbine emulator conceived with the “hardware-in the-loop” simulation techniques. The emulator is structured in two systems: an electromechanical system based on three main components: a vector controlled asynchronous machine, a double-feed asynchronous generator, and an active break; a real time software system, in which the static...
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This paper deals the embedded energy share between Supercapacitors (SC) and batteries. SC modules are dimensioned for peak power requirement and batteries provide the power in steady state. This last is directly connected to the DC-bus to maintain the voltage level between 38V and 60V. A buck-boost converter is interfaced between the SC and the DC-bus to manage the available energy. The originality...
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This paper presents two wind converter structures based on an axial flux PM synchronous generator directly coupled to the wind turbine. For the generator model, a 2-D analytical solution of the Maxwell's equations in the machine is used. A rectifier model is developed, taking into account the diodes commutation mode. The first topology which supplies a RL load is composed by a small wind turbine,...
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This paper deals a new strategy for wind-diesel hybrid system energy improvement using Ultracapacitors (UC) and Battery. Energy management strategies are focused on the frequencies distribution of the wind generator current between UC and Battery. The developed control laws are based on the knowledge of the dynamic behavior of each source, in aim to prevent the diesel generator against the fluctuating...
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Alimentary Pharmacology & Therapeutics > 31 > 1 > 92 - 101
Background Adalimumab (ADA) and certolizumab pegol (CZP) have demonstrated efficacy in Crohn’s disease (CD) patients previously treated with infliximab (IFX).
Aim To assess the efficacy and tolerability of a third anti‐TNF in CD after failure of and/or intolerance to two different anti‐TNF antibodies.
Methods Crohn’s disease patients who received ADA or CZP after loss of response and/or intolerance...
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This paper deals the supercapacitor (SC) and battery energy management in hybrid vehicle applications. The main goal of this study is based on embedded energy share between these sources using a full bridge converter topology. The originality of this paper is focused on full bridge converter control methodology for embedded energy management. The proposed strategy is based on classical PI controller...
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In this paper, the authors propose a behaviour simulation of a micro power station system for electric power generation in isolated equatorial regions, e.g. Africa and South America. These remote areas have usually a good potential of hydroelectric relative to small community or activity need. They are characterized by sufficient rainfall, which leads to the steady average flow of the rivers. Despite...
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In this paper a methodology of sizing optimization of the stand-alone hybrid energy systems is presented. This approach makes use of a deterministic algorithm to suggest, among a list of commercially available system devices, the optimal number and type of units ensuring that the total costs of the autonomous hybrid wind/PV/Diesel, wind/Diesel and PV/Diesel energy systems are minimized while guaranteeing...
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This paper deals with a specific peak power tracking method designed for low power wind systems operating in autonomous mode. Tracking operation is based on battery control associated to a controlled load structure. The proposed system provides a good compromise between two power supply requirements: to maximize the wind energy conversion and to ensure the balance between required and produced power,...
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In this paper a methodology for calculation of the optimum size of a stand-alone hybrid wind/photovoltaic (wind/PV) system is developed. The collection of six months of data of wind speed and ambient temperature recorded for every hour of the day and an estimate of solar irradiance were used. These data and manufacturer's specifications on a wind turbine and a PV module were used to calculate the...
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This paper presents a new methodology of sizing optimization of a stand-alone hybrid renewable energy system. The developed approach makes use of a deterministic algorithm to minimize the life cycle cost of the system while guaranteeing the availability of the energy. Firstly, the mathematical modeling of the principal elements of the hybrid wind/PV system is exposed showing the main sizing variables...
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This paper deals with the segmentation of frequency domain to achieve DC bus stability by efficient design of storage and control principle. The wind energy disturbances measured on DC link are actively filtered by flywheel and battery storages to provide smoothed and secured behaviour of diesel engine. This is obtained by cascaded low pass filters applied to currents control when the dc link voltage...
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We have showed that frequency bands of interaction as well as dynamics of energy flow to the point of common coupling (PCC) lead to hybrid system design keys [9]. In case of a given system it is obvious that PCC will be influenced by the disturbances from the load. This can affect the stability for the worst. Related to each power source and the load behaviour, storage devices and control strategy...
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We show that frequency bands of interaction as well as dynamics of energy flow to the point of common coupling (PCC) lead to hybrid system design keys. Related to each power source and storage device, segmentation of frequency domain of the hybrid system is achieved by control strategy in time domain.
