本文旨在研製高穩定性與低轉矩漣波之六臂型三相變流器永磁式同步電動機的驅動器。電力電路採用六臂型三相變流器，每相繞組個別獨立，可提升系統直流鏈電壓使用率，並使用零相序電流估測器以計算電流的三次諧波含量，做為抑制電流三次諧波含量之補償信號。在單相故障後，使未故障之兩相電流相差60度，注入抑制三次諧波之補償量，抑制未故障兩相電流之諧波，以減少電動機轉矩漣波。
本文以計算機模擬軟體Matlab/Simulink模擬永磁式同步電動機驅動器，並比較各種電流控制與電流諧波抑制控制策略，以及故障前與故障後電流諧波抑制控制策略之性能，做為實體製作之依據。文中採用數位信號處理器TMS320F288335為控制核心，完成六臂型三相變流器之永磁式同步電動機驅動系統研製，其中控制程式以C語言完成。本系統在故障前之電動機電流三次諧波含量由28.71%降低至3.05%。需供應之電流峰值由1.212 標么降至1.017標么，零軸電流由0.256 標么降至0.021 標么。當a相故障後，b相電流的三次諧波含量由7.00%降至1.36%，ｃ相電流的三次諧波含量由9.91%降至3.06%。零軸信號之三次諧波含量由25.19%減少至2.19%，電磁轉矩漣波由85.57%減少至2.85%，由實測結果可驗證本文的控制策略可行性。

This dissertation focuses on development of low-torque ripple and high stability with a six-arm inverter for three-phase permanent-magnet synchronous motor (PMSM) drives. In this structure, the power circuit uses six-arm three-phase inverter. Each phase of the PMSM is operating independently to raise the utilization factor of dc-link voltage. By using zero-sequence current estimator, it calculates the content of third-harmonic in current. These calculated results can be used to eliminate the third-harmonic of current. When a winding of three-phase PMSM breaks down, the other two winding currents will be corrected to result in a 60-degree angle difference. The component which can suppress the third-harmonic of current was injected into healthy phases to eliminate currents harmonics, thereby reducing torque ripple.
In this dissertation, Matlab/Simulink is used to simulate the proposed PMSM system. Performances with different current control and current harmonics mitigation control strategies for PMSM operated under normal and post-fault conditions are compared. This control method could be used to implementation of system. A prototype PMSM system was built with TMS302F28335 digital signal processor. And the program was completed by C language. Under the normal operation of the system, the third-harmonic of current decreases from 28.71% to 3.05%. The peak current required for system falls from 1.212 pu to approximately 1.017 pu. The current of zero-axis decreases from 0.256 pu to 0.021 pu. When the phase a open-circuit is in fault condition, the third-harmonic of current in phase b decreases from 7.00% to 1.36%. The third-harmonic of current in phase c decreases from 9.91% to 3.06%. The third-harmonic of current in zero-axis falls from 25.19 pu to 2.19 pu. The electromagnetic torque ripple decreases from 85.57% to 2.85%.The proposed system performance is thus verified experimentally.

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