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Video
Abstract
There are two major approaches to convert three-phase AC to DC: a passive approach that uses rectifier diodes and capacitors and an active approach that deploys MOSFET/IGBT. Both approaches have associated drawbacks. The extensive use of active switching devices and capacitors impairs the overall reliability of the converter system. For an integrated three-phase generator rectifier system, such as in offshore wind farms or electrical ships, trade-offs can be made between generators and rectifiers in such a way as to make feasible the simplest rectifier bridge implementation. The goal is to find the optimal trapezoida-shaped back-emf such that the output DC ripple loss is minimized while a near-unity power factor of the generator is maintained.