| Summary: | 碩士 === 國立成功大學 === 電機工程研究所 === 81 === For a PWM ac-to-dc converter, an indirect current control
strategy is proposed. It is capable of :(1) unity and even
leading or lagging power factor, (2) nearly sinusoidal current
waveform, (3) bilateral power transfer, and (4) saving the cost
of the current transducer.However, there are two disadvantages
as follows:(1)the series resistance and the DC filter capacitor
in the line will affect the system dynamic stability, and (2)
mutual inductance of three-phase inductor will result in the
error of the constant and thereby cause the phase shift of the
input current. This thesis proposes some strategies to improve
the above shortages. The results of the simulation and the
experiment both show the correctness of the proposed strategies
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