本文旨在研製用於動力計且具將待測電動機在原動機操作時具能量回收之雙向功率轉換的三相感應電機驅動器。此驅動器包含三相交流-直流功率轉換器、直流鏈及換流器。三相感應電動機驅動採用間接式轉子磁場導向，回授感應機相電流，並使用解角器回授感應電動機轉軸之角度，完成轉速及電流閉迴路之控制，提升驅動性能。另者，當待測電動機剎車時，三相感應電機則操作於發電機模式下，文中提出三相交流-直流功率轉換器之設計、回授市電相電壓，並利用數位鎖相迴路估測市電角位置以用於同步旋轉座標系統轉換、三相交流-直流功率轉換器之直流電壓與電流閉迴路控制，完成與市電的併聯。
本研究使用Matlab/Simulink作整體的模擬，並作為實作之依據。本文之系統以德州儀器公司之數位信號處理器TMS320F28335 為控制核心，其控制策略大都由軟體程式完成，故可減少電路元件。當三相感應電機在電動機模式、轉速為2000 rpm 時，電動機的輸出功率為2kW，電動機輸入端相電流峰值為12.80 A，總諧波失真率為4.31%，市電側相電流峰值為7.44 A，總諧波失真率為5.14%，市電側至感應電動機輸出側之整體效率為76.50%；而當三相感應電機在發電機模式、轉速為2000 rpm下，原動機的機械輸入功率為2 kW，發電機之相電流峰值為12.83 A，總諧波失真率為3.04%，三相市電側相電流峰值為5.82 A，總諧波失真率為4.57%，感應發電機端至市電側之整體效率為72.69%。由以上之實測結果驗證本文系統之可行性。

The thesis aims to develop bidirectional three-phase induction machine drives for dynamometer with the feature of energy recovery when the electric motor under test serves as a prime mover. The bidirectional power conversion consists of power converter, dc-link and power inverter. The three-phase induction machine is operated either in motor or generator mode, corresponding to the motoring or braking operation of the electric motor under test. Under motor mode, indirect rotor field-oriented control is introduced. The feedback signals of three-phase current, rotor position and speed are obtained for current vector as well as speed closed-loop controls. Whereas, for induction generator under grid-connected operation, the reversed three-phase power conversion and digital phase-lock loop are designed to calculate the phase angle of power grid to facilitate synchronous frame transformation for the dc voltage and current closed-loop controls.
System simulation is given using Matlab/Simulink. A 32-bit digital signal processor, TMS320F28335, is adopted as the control core. Since control strategies are mostly implemented by software program, circuit components are reduced largely. Experimental results show that when the three-phase induction machine is operated in motor mode at 2000 rpm, the power output from the induction motor is 2 kW with the peak phase current and total harmonic distortion (THD) of 12.80 A and 4.31%, respectively, on the motor input; the corresponding values on the grid side are 7.44A and 5.14%. The overall efficiency of the motor drive reaches 76.50%. While in generator mode at 2000 rpm, the mechanical power input to the induction generator is 2 kW, the peak generator phase current and THD are 12.83A and 3.04%, respectively. The corresponding values on the grid side are 5.82A and 4.57%. The overall efficiency of the generator system is 72.69%. The experimental results verify the feasibility of the proposed system.

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