I. PAPADOPOULOS
3 records found
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The main objectives of this research are to understand how WPT techniques can be efficiently incorporated into PV devices, such as PV cells and modules, find out whether these techniques in theory and in practice are efficient enough and suggest the best design approach as a guideline for near future prototyping.
Many different WPT methods were studied in theoretical level, such as the Capacitive Power Transfer (CPT), the Inductive Power Transfer (IPT) and the Magnetic Resonant Coupling (MRC). Based on the main advantages and disadvantages of these methods, the most efficient seems to be the MRC, which eventually was used as the main method of transferring power wirelessly in the systems of this thesis project.
The systems that were developed and studied consist of a PV generator made of a single IBC solar cell or a PV generator that consists of 16 connected in series IBC solar cells, an inverter that converts the direct current (DC) of the generators into alternating current (AC) and two resonant circuits, the primary and the secondary one. Between these circuits, the power is transferred wirelessly from the primary to the secondary one, through the magnetic field that is created.
During this project, the main mathematical models were developed and were used for simulations in both Matlab and Simulink. The main goals of these simulations were to find out which type of coils, as far as the shape, the cross section and the values of turn width, turn spacing, distance between the coils and number of turns are concerned, and which compensation topology would help the systems to develop higher efficiencies.
According to the results, when ideal DC to AC conversion at the primary side of the system is assumed, the most ideal option seems to be the Series-Series compensation topology with planar coils of circular shape and rectangular cross-section, for which the systems developed efficiencies higher than 85% when the circuits were connected with one solar cell and above 98% when the circuits were connected with one module of 16 solar cells.
Commissioning studies of the CMS hadron calorimeter have identified sporadic uncharacteristic noise and a small number of malfunctioning calorimeter channels. Algorithms have been developed to identify and address these problems in the data. The methods have been tested on cosmic ray muon data, calorimeter noise data, and single beam data collected with CMS in 2008. The noise rejection algorithms can be applied to LHC collision data at the trigger level or in the offline analysis. The application of the algorithms at the trigger level is shown to remove 90% of noise events with fake missing transverse energy above 100 GeV, which is sufficient for the CMS physics trigger operation.
@enThe CMS Hadron Calorimeter in the barrel, endcap and forward regions is fully commissioned. Cosmic ray data were taken with and without magnetic field at the surface hall and after installation in the experimental hall, hundred meters underground. Various measurements were also performed during the few days of beam in the LHC in September 2008. Calibration parameters were extracted, and the energy response of the HCAL determined from test beam data has been checked.
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