645 research outputs found
High-performance hysteresis modulation technique for active filtersProceedings of Applied Power Electronics Conference. APEC '96
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Improved Constant-Frequency Hysteresis Current Control of VSI Inverters with Simple Feed-forward Bandwidth Prediction
No full textImproved constant-frequency hysteresis current control of VSI inverters with simple feed-forward bandwidth predictionIAS '95. Conference Record of the 1995 IEEE Industry Applications Conference Thirtieth IAS Annual Meeting
No full textUrban mining and water recycle for abandoned transurban areas (DATA project)
No full textIn the last decades, due to the processes and changes taking place in various sectors, landscapes have been gradually transformed and many areas have been abandoned. This process made large sites available, that were no longer used for original purposes but are often localized in areas of strategic value for the development of cities. All the previously developed areas, now abandoned or underused ones, raise concerns increasing the need of rethinking landscapes in order to protect environment. Instead of consuming new green lands, the underused ones need to be redeveloped and to be given a new life. The purpose of recovering abandoned lands, is not only to achieve a more sustainable urban setting, but it is also an issue of significant interest for economic and social impacts. It represents an opportunity to overcome the problem of land availability, that is an increasingly scarce resource and to simultaneously propose more sustainable urban living solutions, in harmony with nature. The DATA project (Development of Abandoned Transurban Areas) carried out by the University of Padova, is an attempt to fulfill that aim. The result is a complex interdisciplinary project in which architects and environmental engineers collaborate on the re-qualification of some abandoned areas located in Padova. The involved areas (more than 100 hectare) are located on the edge of the historic city, along the railway lines or the main roads, and industrial fabric scattered around the suburban territory. The project will particularly analyse the waste and water streams produced during the requalification activities and, following the urban mining concept, will propose solutions for their internal reuse and recycle both during and after the dismantling process. Phytotreatment units to recycle rain and wastewater will be planned as green corridors; demolition waste will be considered to build roads, fences and different constructions. Various requalification scenarios will be evaluated including through mass balance of waste and water recycled and emissions accounts. Data collected during the project will be organised in a specific electronic sheet to be of reference for future similar actions. The project involves 6 professors, 6 junior researchers and 12 companies and it is financed by the EU and Veneto Regional Government under the POR-FSE contribution
High Efficiency Quasi Resonant DC Link Converter for Full-Range PWM
No full textA quasi-resonant DC link soft switching inverter is presented, capable of PWM operation. It requires only two additional switches, and allows loss limitation in the resonant circuit. The modulation method adopted is able to perform true PWM operation at any modulation index. Simulated and experimental results are reported, confirming the effectiveness of the proposed solution
Ac/dc/ac PWM converter with reduced energy storage in the dc link
No full textThe family of quasi-direct power converters, i.e. forced-commutated AC/DC/AC power converters including small energy storage devices in the DC link, is introduced. In particular, the case of a three-phase to three-phase quasi-direct converter is considered. Since energy storage minimization calls for instantaneous input/output power balance, a proper control strategy is needed. A simple and effective control technique suitable for this purpose, which also provides high power factor and small distortion of the supply currents, is described. The general properties of quasi-direct power converters are discussed, design criteria of both power and control sections are given, and experimental results of a 2 kVA prototype are reported
Sedimentology and petrology of Quaternary sediments from the Hellenic Trench, Mediterranean Ridge and the Nile Cone from D.S.D.P., Leg 13, cores
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