傳統三相多脈波變流器之架構，具較低開關頻率及較佳諧波的特性，因此非常適用於中、高功率之應用，但因其多脈波變流器架構之不可控性與不易調節，常導致其應用受到諸多限制。為此，本文提出12及24脈波電壓源之多階層變流器兩個架構，每個架構均由直流-交流二階層變流器及Zig-Zag變壓器所組合而成，以進行輸出電壓波形與電力品質等之分析探討，該二架構在三相電壓平衡情況下，Zig-Zag變壓器除具備系統隔離效果的特性外，亦可抑制或抵消系統之某些特定的諧波；再者，變流器之開關切換角度係採用選擇特定諧波消除脈波寬度調變之四分之一與半波對稱兩種策略，可進一步降低並改善系統輸出電壓之總諧波失真，並達到調節較大輸出電壓範圍之功能。
最後，變流器之開關角度解係以牛頓-瑞福森之數值方法所求得，藉此可控制變流器的輸出電壓之基本波及消除特定諧波，本文另提出以分段式之最小平方法求得該開關角度解之近似曲線函數，俾利將該函數安置於數位信號處理器內，使系統更易於控制，並降低占用數位信號處理器記憶體之空間；最後，本研究並自行開發其實驗系統，以驗證所提之12及24脈波多階層電壓源兩個架構、脈波寬度調變技術與近似曲線函數等之應用。

The structure of three-phase traditional multi-pulse inverters that feature lower switching frequency and harmonic characteristics is very suitable for medium and high power applications. But as its multi-pulse inverter structure is neither easily controllable nor adjustable, which normally lead to a big limitation of its applications. In view of the above limitation, this paper proposed 12- and 24-pulse voltage source multilevel inverters, which were composed of DC-AC two-level inverters and Zig-Zag transformers, to study and analyze voltage waveforms and quality of power output. In the proposed structures, and on the condition of three-phase voltage balance, the Zig-Zag transformer demonstrated not only isolation characteristics of the system, but also features of inhibition or counteraction of some specific harmonics. It was further found that, in the use of quarter- and half-wave symmetry strategies for selective harmonic elimination Pulse-Width Modulation (SHE-PWM), switching angles of inverters could further reduce and improve total harmonic distortion of the system output voltage, and lead to better adjustment of a larger range of output voltage.
Finally, the switching angles of inverter were solved using numerical methods developed by Newton-Raphson to control fundamental of output voltage of the inverter and also eliminate specific harmonics. Besides, an approximation curve function of the switching angles solve, using segmented least square method, was also proposed so that the function could be set into the digital signal processor for easier control of the system and better reduction of the space occupied by the memory of digital signal processor. Last but not least, an experimental system was worked out to verify the applications of the proposed 12- and 24-pulse voltage source structures, the pulse-width modulation technique, and the approximation curve function as well.

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