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Four sensorless control schemes for the operation of induction motors in the field-weakening region are compared and assessed in terms of performance and complexity. These four control schemes fully utilize the maximum available voltage and current and can produce the maximum possible torque in the entire field-weakening region. For comparison, the four control schemes are implemented on the same...
Control systems for the induction motor fed by current source converter based on a multiscalar models are presented in this paper. The topology of current source inverter is shown. Equations of multiscalar model of the induction motor are derived. The multiscalar model is the new approach to the control of induction motor based on DC-link current and rotor flux vector. The speed observer system is...
Low voltage ride through capability of DFIG wind energy conversion system had been paid much attention. The steady-state model of DFIG is discussed first, then the dynamic model is analyzed which considers transient current in stator side during voltage sags. To implement the LVRT capability of DFIG wind turbine, a method integrating rotor active crowbar and dcside damp circuit is adopted, and the...
This paper presents a novel V/f controlled induction motor for improvement of speed characteristics. The proposed method is an auto-boost voltage method to compensate the voltage drop of stator impedance and a slip frequency compensation method to decrease the speed error caused by the change of load. The operating region of proposed method is discussed by using vector locus. The stability of the...
A certain method for the direct coupling of electrical circuits and two-dimensional finite element calculations is used for the transient analysis of a complete drive system in the time-domain. Thereby, a novel and deeper insight into the invoked harmonic spectrum of the electrical stator current and the mechanical torque at the rotating shaft could be achieved
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