INTRODUCTIONRENEWABLE sources often produce power and voltage varying with natural conditions (wind speed, sun light etc.,) and grid connection of these sources is essential if they are ever to realize their potential to significantly alleviate the present day problems of atmospheric pollution and global warming. However, electric utility grid systems cannot readily accept connection of new generation plant without strict conditions placed on voltage regulation due to real power fluctuation and reactive power generation or absorption, and on voltage waveform distortion resulting from harmonic currents injected by nonlinear elements of the plant.
The project describes a wind farm comprising a number of turbines housing direct-drive, variable-speed permanent- magnet generators of a novel type proposed and whose variable-speed capability is achieved through the use of an advanced power electronic converter.The modeling of the wind power converter with the network is addressed using case studies of voltage fluctuation and harmonics propagation. The studies have demonstrated that the impacts on voltage fluctuation and harmonic distortion can be minimized and furthermore, the network voltage control could also be improved by the advanced power electronic converters proposed.
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