| Summary: | 碩士 === 明新科技大學 === 電機工程研究所 === 102 === Voltage source inverter（VSI）is widely used in AC motor drive system. In pulse-width modulation controlled VSI, low-order voltage distortion exists between the voltage command and the actual output voltage. The torque ripple result from the voltage distortion will deteriorate the performance of motor drive. Hence, the aim for this thesis is to propose an adaptive compensation method to nonlinear VSI of surface-mounted permanent-magnet synchronous motor (SMPMSM) drive. Basically, the major contributions of this thesis can be summarized as follows. First, the spectrum of the phase distorted voltage is analyzed it is seen that the main component of the low-order distorted voltage are fundamental, 3th, 5th and 7th component. Second, the proposed adaptive compensation method can adapt to varying operational conditions without any priori measurement and extra added hardware. Third, in the proposed compensation method, the fundamental component is also compensated to reduce the sensitivity of synchronous current proportional-integral（PI） controllers to nonlinear effect of VSI. Hence, the voltage command is almost identical to the actual output voltage, and the proposed method can benefit system that with voltage command to execute rotor position sensorless control and/or on-line parameter estimation. Finally, a DSP-based SMPMSM drive prototype is constructed. Some experimental result are given to verify the feasibility of the proposed adaptive compensation method.
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