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This paper presents a simple passive voltage balancing circuit for a modular DC/DC step-up converter for medium voltage (MV) DC grid in wind energy systems. The proposed auxiliary circuit is able to balance the capacitor voltages over a wide range of operating points. Regarding the converter, high frequency step-up resonant circuits with high gain rectifier modules are combined to form a modular step-up...
The use of medium voltage dc (MVDC) grid in offshore wind farms has been presented as an alternative solution to eliminate the conventional bulky low frequency step-up transformers used in the medium voltage ac grid. In order to reduce the transmission losses, the trend is to increase the wind turbine output voltage to at least thousands of volts. In this paper, a variable frequency controlled MVDC...
This paper presents a new single-stage AC/DC step-up soft-switched converter for medium voltage (MV) DC grid for wind energy systems. To achieve close-to-unity power factor, stepping up the voltage and reduce the number of conversion stages, a three-phase boost AC/DC rectifier and a high frequency step-up resonant converter with high gain rectifier modules are combined into a single-stage step-up...
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