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The Brushless Doubly-Fed Machine is a new type electrical machine having some typical characteristics similar to a normal synchronous machine. Reactive power regulating and the V-curve are some of them. By adjusting the control winding current of the machine, the reactive power of the power winding drawn from the grid can be changed and the power factor can be improved consequently. In this paper,...
The stator-flux-oriented vector control strategy for double-fed induction motor was investigated in this paper. Three phase three-level rectifier was used as AC/DC block. This rectifier works with low harmonic distortion in the grid side. Besides, it maintains a high power factor while the energy flows in bidirectional way. For the DC/AC converter, three-level inverter was adopted. Using stator-flux...
A method of sensorless vector control with unity power factor for surface mounted permanent magnet synchronous motor (SPMSM) is presented. The method can realize the motor control of unity power factor under the rated speed, and the motor can also work normally under high speed by way of field weakening. Comparing with the vector control of the statorpsilas magnetic force plumbs with the permanent...
Since variable-speed generation has a higher energy capturing and converting efficiency than the fixed-speed system, new proposals for wind power system utilize variable-speed generators are introduced, among which permanent-magnet synchronous generator(PMSG) is an attractive choice. This paper describes a sensorless vector control strategy for a direct-driven PMSG, which is connected to the power...
The paper deals with resultant stator-field vector control for a voltage-source inverter fed wound-excited salient- pole synchronous motor with damper bars. Two control strategies are presented: one for the constant, uncontrolled excitation and the other for controlled exciting current. The first method ensures the control of the stator-field oriented longitudinal armature reaction, which determines...
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