本文旨在設計具雙向功率轉換之市電併網型三相永磁式同步電動機驅動器。當系統於發電機模式運轉時，不須額外剎車電阻，即可將機械能轉化成電能回饋至市電，大幅降低電能損耗。系統含具市電併網功能與驅動電動機之市電側與電機側二個雙向的三相功率轉換器:市電側功率轉換器採用市電的電壓向量控制以控制市電側電流及輸出直流電壓，並利用同步旋轉座標系統下之雙二階通用積分器估測市電電壓角位置以提高市電側的功因;電機側三相功率轉換器則採用磁場導向控制，以電流偵測元件回授電動機的電流，並使用解角器回授同步電動機轉軸之角位置及轉速，完成轉速及電流閉迴路控制，提高驅動器之性能。
本研究以Matlab/Simulink進行整體的模擬，俾為實作之依據。本文系統之前、後級功率轉換器皆使用德州儀器公司出產的數位信號處理器TMS320F28069為控制核心，其控制策略皆由軟體程式完成，故可大幅減少電路元件。當本文之系統在1500 rpm、輸出機械功率為2.22 kW之電動機模式運轉時，市電側電流峰值與總諧波失真率分別為10.1 A及3.37%，電動機輸入端相電流峰值與總諧波失真率則分別為20.3 A及3.93%，市電側整流器、電機側換流器與電動機效率分別為98%, 98% 及 85%, 市電側至電動機輸出側之整體效率為82%。另者，在轉速為1500 rpm，機械輸入功率為2.44 kW之發電機模式運轉時，發電機輸入端之電流峰值與總諧波失真率分別為16.0 A及3.75%，市電側電流峰值與總諧波失真率分別為7.2 A及4.57%，發電機、電機側整流器與市電側換流器效率分別為82%、98%及97%，發電機輸入端至市電側之整體效率為80%。實測結果驗證了本文系統之可行性。

This thesis aims to design grid-connected three-phase permanent-magnet synchronous motor (PMSM) drives with bidirectional power conversion. Energy recovery feature is provided for loss reduction in generator mode without additional breaking resistor. The system includes bidirectional three-phase grid- and motor-side power converters. The former uses grid voltage vector for input current control and dc output voltage supply. Meanwhile, a dual second-order generalized integrator under synchronous frame is adopted to estimate the phase angle of grid voltage for power-factor enhancement. Whereas, the latter drives PMSM with field-oriented control using resolver and current sensors to feed back rotor position, speed as well as phase current for speed and current closed-loop controls in order to improve the performance of the proposed drive.
System simulation is given by using Matlab/Simulink. A 32-bit digital signal processor, TMS320F28069, 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 PMSM is operated under motor mode at 1500 rpm, the mechanical power output from the PMSM is 2.22 kW with the peak grid phase current and total harmonic distortion (THD) of 10.1 A and 3.37%, respectively, the corresponding values on the motor input are 20.3 A and 3.93%. The efficiencies of grid-side rectifier, motor-side inverter and PMSM are 98%, 98% and 85%, respectively, resulting in the overall efficiency of 82%. While in generator mode at 1500 rpm, the mechanical power input to the permanent-magnet synchronous generator (PMSG) is 2.44 kW, the peak generator phase current and its THD are 16.0 A and 3.75%, respectively. The corresponding values on the grid side are 7.2 A and 4.57%. The efficiencies of PMSG, motor-side rectifier and grid-side inverter are 82%, 98% and 97%, respectively, yielding the overall efficiency of 80%. The feasibility of the proposed system is verified experimentally.

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