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In wind generator applications, generator speed varies with wind speed. In the case of permanent magnet synchronous generators, this translates into voltage magnitude and frequency variations. For such applications, it is advantageous to employ active rectifiers with buck-boost capability to interface the generator to a DC-bus. A PWM active rectifier cascaded with a Z-source DC-DC converter circuit...
A quasi-Z-source three-phase rectifier is analysed by deriving its detailed dynamic model using circuit averaging and the synchronous reference frame. The quasi-Z-source provides the same advantages as the Z-source rectifier as well as additional advantages such lower rated capacitors. The quasi-Z-source rectifier contains non minimum phase zeros in its control to output voltage and control to inductor...
Multilevel switched-capacitor DC-DC converters have been proposed for applications that require interfacing two DC-buses or sources. High-voltage DC-bus in general is specified to be an integer multiple that of the low-voltage side. Low efficiency, bulky capacitor banks and unequal voltage sharing have been identified as some of the shortcomings of these converter topologies. This paper will show...
Capacitor-switching operations present in switched-capacitor (magnetic-less) DC-DC converters give rise to spiky capacitor and hence semiconductor devices currents. The magnitudes of these currents and hence semiconductor devices switching losses are proportional to instantaneous capacitor voltage unbalance. Capacitor switching power loss on the other hand is proportional to instantaneous voltage...
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