A Grid-Connected Energy Conversion System for the Treadmill with Auto-transferring Modes of Motor and Generator

• Main Authors: Tzu-HsuanTseng, 曾子軒
• Other Authors: Hong-Tzer Yang
• Format: Others
• Language: en_US
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/70910971245556286629

碩士 === 國立成功大學 === 電機工程學系碩博士班 === 100 === 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.