本論文提出一具適應性諧波注入機制之不連續導通模式的單開關三相升壓整流器，可提供寬範圍的直流輸出電壓給電源系統，如脈波調變控制的變頻器與不間斷電源供應器。
此外，不連續導通模式之單開關三相升壓整流器於定頻控制之下，其三相輸入電流含有相對較高的五次諧波成分，致使轉換器之輸入電流總諧波失真嚴重。在固定的電壓轉換比之下，傳統的諧波注入機制可藉由注入固定的六倍頻諧波訊號，降低整流器輸入電流的五次諧波。然而，注入固定的六倍頻諧波訊號，無法有效改善轉換器操作在不同電壓轉換比之下的五次諧波失真。
因此，本論文提出一具適應性諧波注入機制，係根據所偵測的輸入與輸出電壓值，來改變所注入的六倍頻諧波訊號大小，使轉換器操作在不同電壓轉換比之下，有效降低其輸入電流的五次諧波成分，改善總諧波失真。
最後，實作一1kW雛型電路，進行總成測試，量測輸入電流諧波成份與輸入端功率因數，驗證本論文所提出之具適應性諧波注入機制，即使在寬輸出電壓範圍下，亦可有效改善輸入電流諧波成分，符合IEC61000-3-2 Class A 規範。

This thesis presents an adaptive harmonic injection mechanism for the single-switch three-phase discontinuous Conduction Mode (DCM) boost rectifier to provide a wide output voltage for the power systems, such as pulse amplitude modulation (PAM) inverters and uninterruptible power supply (UPS) systems.
Furthermore, the line currents of the single-switch three-phase DCM boost rectifier with constant frequency control contain relatively large fifth-order harmonic, to result in high total harmonic distortion (THD). The conventional harmonic injection mechanism is developed for the reduction of the fifth-order harmonic by injecting a constant sextuple harmonic signal to modulate the duty cycle at the fixed voltage-conversion ratio. However, the amplitude of the injected sextuple harmonic signal needs to be varied according to different line voltages and output voltages. Therefore, an adaptive harmonic injection mechanism is proposed to vary the amplitude of the injected sextuple harmonic signal according to the sensed different line voltages and output voltages for lowest THD.
Finally, a 1kW prototype circuit of the proposed adaptive harmonic injection mechanism for the single-switch three-phase DCM boost rectifier is designed and implemented to verify the input power factor correction (PFC) and line current harmonic for the fulfillment of IEC61000-3-2 Class A standard at wide output voltages.

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