| Summary: | 碩士 === 輔仁大學 === 電子工程學系 === 92 === The present study aims to deal with a three mass spring load system transient vibration suppression for a large-scale synchronous motor driving system which is controlled by a VVVF (Variable Voltage Variable Frequency) inverter and started by a pulse width modulation (PWM) output voltage. During the starting period, an optimal passive element for a starting control scheme is inserted in a field circuit of a salient-pole synchronous motor. Meanwhile, a VVVF inverter is utilized to achieve VFSS (Voltage/Frequency Soft Starting) through six-step square wave and pulse width modulation voltage. The pre-assigned displacement angle of a inverter and the optimization of acceleration time under different constant load torques are determined by quadratic vibration performance index. Computer simulation shows that, during the starting period, the proposed VFSS scheme of a inverter control can not only suppress the amplitude of transient vibration of a synchronous motor driving system effectively, but also improve the dynamic performance.
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