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Voltage source converters (VSCs) play an important role in the power conversion of renewable power generation (RPG) systems. Conventional power systems are considerably affected by power electronic devices in systems with a high percentage of RPG. Various abnormal interactions in the form of oscillations between VSCs and grid have been reported, whereas the mechanism at the core is still lacking understanding...
The isolated modular multilevel dc–dc converter (IMMDCC) constructed by two modular multilevel converters (MMCs) and a medium frequency transformer is attractive for medium- and high-voltage dc-grid applications by offering the following features: the modular multilevel structure can handle high voltages with the series connection of lower voltage submodules; the MMC operating manner reduces the current...
A novel back to back cascaded medium voltage converter is proposed for wind power generation. In the generator side, it is a H-bridge cascaded converter, which employs the vector control based on rotor flux orient to drive the medium induction generator. In the grid side, a series of two-level voltage source converters are used to support an isolated DC voltage for each H-bridge cell in the generator...
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