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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...
Based on feedback of the stator current phase, a new control strategy of doubly-fed induction generator (DFIG) is proposed. Under the condition that stator current amplitude maintains at rated value, the required rotor control voltage is directly calculated by the stator flux, rotor rotating speed, stator current phase and its corresponding error. Constant converter switching frequency and stator...
Compared with the doubly-fed AC excited wind-power generation system, the directly-driven permanent magnet synchronous generator (PMSG) for wind-power system has advantage of simpler structure, higher generation efficiency and more reliable operation. To solve the weakness associated with the traditional id=0 control scheme, such as relatively large power rating for generator-side converter and correspondingly...
This paper presents a modified direct power control (DPC) strategy for a doubly fed induction generator (DFIG) based wind power generation system under unbalanced grid-voltage conditions. The strategy is based on the investigation of the mathematic model and the composition of the instantaneous active and reactive power outputted by DFIG. It is found that, by applying a notch filter of two times of...
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