本文旨在研製三相獨立驅動之永磁式同步電動機驅動器及斷相故障後的控制策略。驅動器的電路架構採用具耦合電感之單相並聯多階換流器，及採用單極性絕對值的脈波寬度調變控制，可提高直流鏈電壓利用率。在回授裝置方面，使用電流偵測元件及數位解角器，回授各支路電流與電動機之角位置，並完成轉速及電流閉迴路控制提高驅動器的性能。電流控制策略採用交、直及零軸電流閉迴路控制，並加入感應電動勢三次諧波函數補償，以及混合abc軸電流閉迴路控制，以抑制電動機相電流諧波失真率並減少電磁轉矩的抖動。當斷相故障發生時，藉由電流回授偵測故障相，並利用故障後電流控制策略，使未故障兩相電流的相位相差 度電工角，以減少轉矩漣波含量並降載使電動機穩定運轉。
本文系統採用德州儀器公司所生產的32位元數位信號處理器(TMS320F28075)作為控制核心，完成三相永磁式同步電動機的實體製作。本文電動機於轉速1200rpm，負載轉矩為2.63N-m時，操作於正常運轉下，a相相電流峰值約為16.24A，電流總諧波失真率為5.79%，其中三次諧波含量為5.67%。電動機於a相發生斷相故障時，當轉速為1200rpm，負載轉矩為0.955N-m，b、c相的相電流峰值(平均值)約為11.15A，電流總諧波失真率(平均值)為9.11%，電流三次諧波含量為8.41%。如此，由實驗結果驗證本文系統之可行性。
關鍵字：單相並聯多階換流器、斷相故障偵測、三次諧波補償

This thesis presents the design of post-fault control strategy of per-phase independent drive of three-phase permanent-magnet synchronous motor drives. The multilevel converter with coupled inductors is adopted as motor drive. The unipolar absolute-value sinusoidal pulse width modulation is used to control to enhance the utilization ratio of dc-link voltage. The current sensor and resolver are used to sensor each branch current and rotor position so that the speed and current closed-loop control is implemented. The quadrature-, direct-, and zero-axis current closed-loop control with the compensation of the third-harmonic electromotive force and abc-axis current closed-loop control to inhibit current harmonic distortion rate and electrical torque dithering. When the fault one-phase occur, the post-fault current control strategy is adopted. The other two winding currents are forced to have 60-degree angle difference to reduce torque ripple and load operation.
The 32-bit digital signal processor, TMS320F28075, is adopted as the system core. The motor with speed of 1200rpm and load torque of 2.63N-m, the peak phase current is 16.24A, yielding total current harmonic distortion(THD) of 5.79% and content of third-harmonic of 5.67%. After a-phase winding fault of motor, speed of 1200rpm and load torque of 0.955N-m, the average peak value of phase current on the others phase is 11.15A, yielding average value of THD of 9.11% and average content of third-harmonic of 8.41%. The proposed system is verified by experimental results.
Keywords：single-phase in parallel with multilevel converter, post-fault detection, compensation of third-harmonic

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