A novel voltage-modulated direct power control (VM-DPC) is first designed for a back-to-back (BTB) converter in the doubly fed induction generator (DFIG) system. The proposed VM-DPC built stator stationary reference frame (??). method uses simple feed-forward and feedback structure without phase-locked loop Park transformation. Therefore, it can be easily implemented BTB converter. Another esse...

partial frames provide a rich context in which to do pointfree structured and unstructured topology. a small collection of axioms of an elementary nature allows one to do much traditional pointfree topology, both on the level of frames or locales, and that of uniform or metric frames. these axioms are sufficiently general to include as examples bounded distributive lattices, $sigma$-frames, $ka...

A modified approach, involving the addition of a low frequency boost voltage, is developed and adopted as an enhancement to the conventional closed loop f v speed control of a three-phase squirrel cage induction motor modeled in the stationary qd reference frame using six-step voltage source inverter waveform. The results obtained show a superior performance in the two basic mechanical characte...

The present paper treats the rotor angle estimation problem in a singlemachine infinite bus setup. The components of the infinite bus voltage phasor are estimated in a coordinate frame that turns with the rotor by means of a Kalman-like filter from exclusively local measurements. Therefore, in addition to the rotor angle, the observer also provides an estimate of the infinite bus voltage. The p...