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Power electronic traction transformer (PETT) is an emerging technology for traction applications. LLC resonant converter is an attractive option for isolated DC/DC stage because of its high efficiency. However, there will be inevitable twice-line frequency ripple on the resonant current due to the singlephase power fluctuation. On the other hand, parameter mismatch between modules can result in power...
In this paper, a novel modular cascaded multi-level converter with multiwinding high-frequency (MWHF) transformer is proposed for medium- or high-voltage applications. In the proposed converter, a cascaded -bridge rectifier (CHBR) is connected directly with the input ac source while the traditional step-down transformer is no longer necessary. Then, an isolated dc–dc converter composed by a group...
This paper presents a DSP-based speed sensorless field oriented vector control system for induction motor. A full-order adaptive observer with stator current and rotor flux as its state variables is used here to estimate the rotor speed. Moreover, the stator resistance is also identified to update the stator resistance value used in the observer so that the rotor speed can be estimated accurately...
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