Doubly fed machines (DFMs) are well known for limited-speed-range applications such as in wind power generation due to their reduced requirement in power electronic rating. Switched DFM drives offer the same benefit on power electronic requirement but operate on a wide speed range. This makes them attractive for wide-speed-range high-power applications, e.g., in ship propulsion. A unique controller is needed to fit the different demands of a switched DFM drive, specifically where both ac and dc supplies are available. This paper presents a control architecture for a switched DFM drive intended for propulsion application. The proposed architecture adapts to the on-the-fly changes in DFM configuration and seamlessly controls the speed/torque during these variations.
Doubly fed machines (DFMs) can be used to make variable speed drives (VSDs) that not only provide full shaft speed control but also avoid the need for a dc electrical bus capable of providing full mechanical shaft power. This makes the DFM attractive for any VSD application where the primary power source is ac. Switching configuration of the DFM on-the-fly opens up opportunity to operate the DFM on a wider speed range with reduced power electronics. This paper explores the design requirements for a switched DFM rotor power electronics in full-speed-range VSD applications, including propulsion drives. Tradeoffs are examined for power electronics sizing versus transient settling characteristics.
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