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The switching frequency of high power traction driving system is very low. Aiming to improve the performance of speed sensor-less vector control in the case of low switching frequency (for example, it is low to 500 Hz), this paper introduces these technologies, such as multi-mode modulation strategy based on space vector pulse width modulation(SVPWM), design of the current regulator based on complex...
In the article, a new approach is considered, which is applying different test current to the motor, closed-loop regulation and making it reach a steady state, finally filtering calculation and getting all the parameters of the motor accurately. This method can run automatically before the induction motor vector controls. So it can improve the performance of vector control without increasing hardware...
Considering the disadvantages of torque ripple and current distortion on traditional direct torque control (DTC) of induction motor, a new direct torque control strategy based on predicting the stator voltage vector is presented in this paper. The stator voltage prediction control scheme estimates the desirable stator voltage of the next cycle by the current state value and the desirable flux and...
An off-line parameter identification of induction motor based on RLS algorithm was presented in the dissertation. Figuring out the Bart wirth digital filter state equation through improved euler numerical solution, the filtering value of signal was got, and the first-order derivative and the second-order derivative also were got directly. It avoids the error influence of derivative discretization...
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