Li Mingshui

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Considering large volume, high cost and low reliability caused by the existence of mechanical sensor in the control system of permanent magnet synchronous motor(PMSM), this paper designed a speed observer instead of mechanical speed sensor based on sliding mode variable structure theory to realize speed sensor-less control of PMSM. Because accurate values(More)
In the direct power control system of three-phase PWM rectifier, the control accuracy of active power and reactive power directly affects the whole system's performances. The DC side capacitor's mechanism on the DC side voltage is analyzed and the power feedforward control strategy based on the power mathematical model is researched in this paper, which can(More)
To keep the switch frequency constant and reduce the fluctuation of flux linkage and torque in traditional elevator drive direct torque control (DTC) system, a method of SVM-DTC based on reference flux linkage is used. Switching table and hysteresis controller in traditional DTC is replaced by flux linkage estimator and SVPWM modulation module. For the(More)
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