Control Architecture for a Switched Doubly Fed Machine Propulsion Drive

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.