在可變速度驅動系統中，通常使用二極體整流器或閘流體整流器當作交流電轉換成直流電的前端裝置。傳統整流器的優點包含成本低廉、裝置簡單及高可靠度。然而傳統整流器產生嚴重的諧波電流於市電並且欠缺回生能量的能力。工業標準IEEE-519和IEC-61000-3-2針對這些問題進行規範。
近年來，工業界廣泛使用絕緣閘雙極性電晶體開關架構的主動前端轉換器，該轉換器的優點包含雙向電力潮流、單位功因、線電流低諧波失真及小濾波器尺寸。因此本文針對主動前端轉換器使用同步參考座標框為基礎的模型，並且詳細討論如何設計控制器來提升干擾阻絕能力和系統的強健性。
當達成高功因操作和回生能量能力的同時，採用主動前端轉換器的成本較二極體整流器前端裝置昂貴許多。因此，本文提出輔助轉換器裝置安裝於二極體整流器前端系統。輔助轉換器和二極體整流器於交流側直接並聯操作，而在直流側則透過兩個二極體彼此相接。輔助轉換器如同並聯式主動濾波器一般，可以補償二極體整流器所產生的諧波電流，而且提供回生能源的能力。輔助轉換器可以達成主動前端轉換器的功能，但是只需要主動前端轉換器0.3-0.5標么的轉換器額定。本文並且利用模擬和實驗結果來驗證主動前端轉換器和輔助轉換器的性能如同理論推導。

關鍵詞：主動濾波器、主動前端轉換器、輔助轉換器

In variable speed drive systems, diode rectifiers or thyristor rectifiers are usually used as the AC/DC front-end. The advantages of the conventional rectifier include low cost, simplicity, and high reliability. However, these rectifiers draw significant harmonic current from the utility grid and lack regeneration capability. Industry standards, such as IEEE-519 and IEC-61000-3-2, are adopted to address these issues.
Recently, Insulated Gate Bipolar Transistor based active front-end (AFE) converter systems are widely utilized by industries thanks to the advantages of bi-directional power flow, unity power factor, low harmonic distortion of the line current and small filter size. This dissertation presents a synchronous reference frame based model for AFE converter and discusses in detail how the control design affects the disturbance rejection capability and robustness.
While achieving high-power factor operation and regeneration capability, however, AFE converters cost much more than diode rectifier front-ends. Therefore this dissertation proposes an auxiliary converter (AXC) for the diode rectifier front-end system. The AXC and diode rectifier are connected in parallel on the AC side. Both are also connected on the DC side via diodes. The AXC system operates as a shunt active filter to compensate for current harmonics of the diode rectifier, and provides regeneration capability. Thus it can accomplish the functionalities of an AFE converter, but with only 0.3-0.5 pu of converter rating. The simulation results and experimental results are used to validate the performance of the AFE and AXC converter system.

Keywords: active filter, active front-end converter, auxiliary converter

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