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Power conversion system for high altitude wind power generation with medium voltage AC transmission |
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| Affiliation: | 1. Atmospheric Research Team, Institute for Environmental Research and Sustainable Development, National Observatory of Athens, 11810 Athens, Greece;2. Collaborator of National Observatory of Athens on Contract to KRIPIS-THESPIA Programme, Greece;3. Aryabhatta Research Institute of Observational Science, Nainital 263 001, India;4. School of Natural Sciences, Shiv Nadar University, Tehsil Dadri 203207, India;1. School of Energy, Power and Mechanical Engineering, North China Electric Power University, Changping District, Beijing 102206, China;2. School of Control and Computer Engineering, North China Electric Power University, Changping District, Beijing 102206, China;1. Department of Mechanical Engineering, Azadshahr Branch, Islamic Azad University, Azadshahr, Iran;2. Department of Thermal and Fluids Engineering, Faculty of Mechanical Engineering, State University of Campinas (UNICAMP), Campinas, Brazil;3. Department of Mechanical Engineering, Universidade Federal de Minas Gerais (UFMG), BH, Brazil;1. Department of Agricultural Engineering, College of Food and Agriculture Sciences, King Saud University, P.O. Box 2460, Riyadh 11451, Saudi Arabia;2. SAFE School, University of Basilicata, Via dell''Ateneo Lucano, n.10, 85100 Potenza, Italy;1. BIOENERGY 2020+ GmbH, Location Wieselburg, Gewerbepark Haag 3, A-3250 Wieselburg-Land, Austria;2. Graz University of Technology, Institute of Thermal Engineering – Thermal Energy Systems and Biomass, Inffeldgasse 25/B, A-8010 Graz, Austria;3. University of Applied Forest Sciences Rottenburg, Schadenweilerhof, D-72108 Rottenburg am Neckar, Germany |
| Abstract: | High Altitude Wind Power (HAWP) generating system provides clean energy at low cost and high capacity factor due to reduced size of the turbine and high speed streamlined wind at high altitude. An air-borne wind turbine (AWT) at high altitude extracts kinetic energy from wind using buoyancy provided by the blimp/aerostat. The generated electrical power is then transmitted to the ground based station (without any power conditioning) using the transmission lines (tether). The power conversion system (PCS) for harnessing HAWP is proposed in this paper. The proposed PCS consists of a three-level neutral point clamped (NPC) rectifier, a three-level NPC DC–DC converter followed by a two-level inverter. Modelling, design and control of the PCS are presented and discussed. The PCS provides generation side maximum power-point tracking (MPPT) using sensorless optimal torque control technique. The DC–DC converter provides electrical isolation as well as voltage step-down functions. A modified proportional resonant (PR) control which can selectively eliminate lower order current harmonics of the grid-connected inverter is also presented. The proposed control scheme of the PCS is evaluated through simulation studies using software programs like PSIM and MATLAB. A scaled-down 1 kW laboratory prototype of the complete PCS is designed, built and tested. The experimental test results obtained validate the proposed control scheme for efficient power generation from high altitude wind and interface to the grid/load. |
| Keywords: | High altitude wind power (HAWP) Permanent magnet synchronous generator (PMSG) Power conversion system Maximum power-point tracking Three-level NPC rectifier Inverter Resonant control |
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