本文旨在設計一具有能夠自動轉換電動與發電模式的跑步機電能轉換系統。藉由轉換器市電併聯的功能，能夠將跑者的動能轉換為電能且輸送回市電。在控制迴路上，加入了紅外線感測器來偵測跑者在跑步機上的位置。因此基於跑者的位置，可在發電模式中由調整發電機的輸出電流，來控制跑步機的轉矩或是轉換為電動模式下，使跑者能夠持續跑動在設定的區間。本篇論文實現了能夠將功率雙向傳輸的電能轉換系統，其中包含了三相AC-DC功率轉換器以及能夠與市電連結的單相DC-AC功率轉換器。此外，abc-dq0轉換被應用在控制器上，能夠將馬達/發電機交流的電流轉換為直流成分，透過控制電流的振幅，達到更好的轉矩控制。最後，本文將製作完成的電源轉換系統，實際應用於跑步機上，驗證了發電與電動模式之雙向控制策略的可行性及有效性。

This thesis proposes a power conversion system for the treadmill with auto-transferring modes of motor and generator. With the grid-connection function, the kinetic energy of the treadmill user can be converted into electricity power and fed into the grid. An infrared sensor is equipped in the control loop to detect the position of the user on the treadmill. Based on the position of the user, the reaction torque of the treadmill is controlled by varying the output current of the generator mode or transferring operation into the motor-mode to keep the user moving within the defined operating area. The bi-directional power conversion system developed includes the three-phase AC-DC power converter and the single-phase DC-AC converter connected to grid. In addition, the transformation of abc-dq0 is implemented into the controller to convert AC current of motor/generator into DC component for better torque control via current amplitude control. The developed power conversion system has been implemented in a specially designed treadmill system to verify the feasibility and effectiveness of the proposed auto mode-transferring control strategies of generator and motor.

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