scholarly journals Ru catalyst supported on nitrogen-doped nanotubes as high efficiency electrocatalysts for hydrogen evolution in alkaline media

RSC Advances ◽  
2020 ◽  
Vol 10 (38) ◽  
pp. 22297-22303
Author(s):  
Qinglei Liu ◽  
Lehao Yang ◽  
Peng Sun ◽  
Haigang Liu ◽  
Jiahua Zhao ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Hydrogen Evolution ◽  
Potential Application ◽  
High Efficiency ◽  
Alkaline Media ◽  
Ru Catalyst ◽  
Nitrogen Doped ◽  
Conversion System ◽  
Energy Conversion System ◽  
Increasing Demand

Due to the potential application in the future energy conversion system, there is an increasing demand for efficient, stable and cheap platinum-free catalysts for hydrogen evolution.

scholarly journals A Wind Energy Conversion System Based on a Generator with Modulated Magnetic Flux

Energies ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 3285
Author(s):  
Michał Gwóźdź ◽  
Michał Krystkowiak ◽  
Łukasz Ciepliński ◽  
Ryszard Strzelecki
Keyword(s):  
Magnetic Flux ◽  
Wind Energy ◽  
Energy Conversion ◽  
High Efficiency ◽  
Synchronous Generator ◽  
Voltage Source ◽  
Magnetomotive Force ◽  
Conversion System ◽  
Energy Conversion System ◽  
Power Electronics Converter

In this work, the concept of an energy conversion system for wind turbines based on the modified permanent magnet synchronous generator (PMSG) is presented. In the generator, a pair of three-phase windings is used, one of which is connected in a “star” and the second in a “delta” configuration. At the outputs of both windings, two six-pulse uncontrolled (diode) rectifiers are included. These rectifiers are mutually coupled by a specially designed pulse transformer, whose primary winding is powered by the power electronics converter—the so-called “current modulator”—which, in this case, operates as a magnetic flux modulator, in the generator. The modulator provides a quasi-sinusoidal magnetomotive force (mmf) in the stator of the machine. The whole system is connected to the power grid via a dedicated voltage source inverter (VSI) converter. The main objective of the elaborated solution is to provide high efficiency conversion of mechanical (wind) energy into electricity by means of a relatively simple electrical system.

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