A DFIG Sensorless Rotor Position Detector Based on a Hysteresis Controller英文教材.pdf

IEEE TRANSACTIONS ON ENERGY CONVERSION, VOL. 26, NO. 1, MARCH 2011 9 A DFIG Sensorless Rotor-Position Detector Based on a Hysteresis Controller ˜ ´ G. D. Marques, Member, IEEE, V. Fernao Pires, Senior Member, IEEE, Sergio Sousa, and Duarte M. Sousa, Member, IEEE Abstract—A simple sensorless method for the detection of the ωs Electrical frequency of the ac mains. mechanical rotor position of the wound-rotor induction machine ωc Crossover frequency. in order to implement stator-flux orientation is described and eval- ψ Stator or rotor flux linkage. uated in this paper. The method is based on the phase comparison of the actual and the estimated rotor currents using the classical Superscripts model of the machine. It can be conceptually implemented in the ∧ Estimated value. rotor or in the stator reference frames. It has some similarity to the s, r Stator or rotor reference frame. model reference adaptive system methodology, but uses a hystere- sis comparator instead of a proportional integral (PI) controller. Subscripts In this way, the method does not need parameter determination for the controllers and shows a considerable independence of pa- α, β Usual αβ variables. rameter uncertainties. Simulation and experimental results show d, q Variables on a moving reference frame. that the method is appropriate for the vector control of the doubly