與傳統三階層中性點箝位(Neutral Point Clamped, NPC)及T型雙向AC/DC轉換器相比，Vienna整流器具有成本低、效率高及較低的電壓應力。在單向功率傳輸的應用中，Vienna整流器的直流鏈電壓可當作雙輸出獨立型的電壓源，以滿足直流鏈匯流排雙負載的不同輸出電壓需求，亦或是雙負載依據不同充電速率應用所造成之變化，以上兩者皆造成輸出電容端電壓產生不平衡之情形，於實際應用中需特別進行考量。 本文提出一種基於無電流感測器前饋控制之新型電壓判斷成分注入法於三相Vienna整流器，包含三種不同功能進行結合： 1. 電壓成分判斷注入法(Voltage Judgement Component Injection Scheme, VJCIS)，在僅電壓訊號下即可進行零序的計算，並且考量輸出電容端電壓平衡及不平衡情形，仍能維持輸入電流無zero crossing distortion，且透過將中性點電壓(Neutral Point Voltage)擾動進行抑制，改善輸出端直流性能。 2. 為了減少電路體積及成本，分析Vienna整流器拓樸並以無電流感測控制架構進行實現，將主架構與所提零序注入法進行結合，減少電路體積及成本。 3. 考量無電流感測架構因單電壓迴路PI控制器的限制，造成輸出電壓暫態及性能受到影響，本論文提出前饋控制(Feedforward Control)架構，透過提前預測Vienna電路於穩態之情形，進行誤差追蹤補償，以改善電壓過衝量(Overshoot)及補償功率半導體元件導通之壓降。 最終透過所提方法經由模擬結果進行分析，與實作建置一台2.4 kW Vienna轉換器比較結果一致，驗證所提方法的有效和正確性。 ;Compared to traditional three-level neutral point clamped (NPC) and T-type bidirectional AC/DC converters, the Vienna rectifier offers lower cost, higher efficiency, and lower voltage stress. In applications with unidirectional power transfer, the DC-link voltage of the Vienna rec-tifier can be used as a dual-output independent voltage source to meet the different output volt-age requirements of the DC-link bus with dual loads. It can also accommodate variations caused by different charging rates of dual loads. Both scenarios result in unbalanced output capacitor voltages, which need to be carefully considered in practical applications. This paper proposes a novel voltage judgement component injection scheme (VJCIS) based on current sensorless feedforward control for three-phase Vienna rectifiers. The proposed scheme combines three different functionalities: 1. The voltage judgement component injection scheme enables zero-sequence calculation based solely on voltage signals. It takes into account both balanced and unbalanced scenarios of output capacitor voltages while maintaining the input current without zero crossing distortion and improving the DC output performance by suppressing disturb-ances in the neutral point voltage. 2. In order to reduce the circuit size and cost, the Vienna rectifier topology is analyzed and the current sensorless control architecture is designed and implemented by combining the main structure with the proposed zero-sequence injection method. 3. Considering the limitations of the current sensorless architecture due to the sin-gle-voltage loop PI controller, which affects the transient response and performance of the output voltage, this paper proposes a feedforward control architecture. By predicting the steady-state conditions of the Vienna circuit in advance and performing error track-ing compensation, it improves voltage overshoot and compensates for the voltage drop across power semiconductor devices. Finally, the proposed methods are analyzed through simulation results and compared with the implementation of a 2.4 kW Vienna converter. The consistency between the simulation and implementation verifies the effectiveness and accuracy of the proposed methods.
