本研究製作一部高功率並聯式主動電力濾波器，同時提出單相循環測試方法來驗證其功能，其中以三相四線半橋式換流器輸出補償電流，並以微控制器Renesas RX62T為控制核心。本換流器主要功能除了主動電力濾波之外，還能達到功率因數校正及三相功率平衡。當負載為非線性負載時，換流器輸出與電網電流諧波成分相同的補償電流來消除諧波；當負載功率因數過低時，換流器為電網提供負載所需之虛功成分，使電網只對負載提供實功；若負載三相功率不平衡時，換流器可以調節三相功率，使電網端的三相功率平衡。
在控制方面，本研究採用分切合整數位控制，其特色為免除繁瑣的abc至dq座標轉換，而是直接採用一個開關週期的電感電流變化量來導出控制法則，故在控制上會將整個換流器數學模型做為一個電流源形式，並且考量電感值變化量，可克服大電流情況下電感值急遽衰減造成波形失真的問題，因此可以直覺地下達電流命令，使換流器輸出相對應的電流。
最後，以模擬驗證控制法之可行性，並製作一部換流器實測其功能。本研究是以高額定功率規格來設計換流器，在測試時沒有足夠耐瓦數的測試負載，所以本研究提出單相循環測試。因系統是採用三相四線半橋式換流器，可將三相換流器中的其中兩相之交流側共同接到電網，一台單相換流器模擬各式負載電流對電網進行抽載，另一台單相換流器對此負載電流進行補償，如此能不需外加負載即可進行功能驗證。
本研究主要有兩項貢獻：第一為將分切合整數位控制應用於高功率換流器，並能達到主動電力濾波、功率因數校正及三相功率平衡功能。第二為提出單相循環測試驗證高功率換流器功能，克服負載耐瓦數不足的問題。

This research designs and implements a high power shunt active power filter(SAPF), and develops a single-phase circulation test to verify its functions. The power stage is a three-phase four-wire half-bridge inverter which outputs compensation current and its microcontroller Renesas RX62T is the control center of the system. In addition to active power filtering function, the inverter can achieve power factor correction and three-phase power balancing. If load is nonlinear, the inverter can output harmonic current to cancel its harmonic component. If input power factor is low, the inverter is able to improve it. If three-phase load is unbalanced, it is able to balance the power among the three-phase inputs.
With the division-summation (D-Σ) digital control, there is no need of abc to dq frame transformation, and control laws can be directly determined by inductor current variations over one switching period. Therefore, an inverter can be regarded as a current source while taking into account inductance variation. As a result, current commands can be issued directly to compensate distorted current waveforms.
Finally, an inverter was simulated and implemented, of which the results have verified the feasibility of the control laws. Considering the power rating of testing load, this research develops single-phase circulation test to verify the functions. Two inverters connected to the same dc-link and ac source in which one emulates various types of load currents, the other provides compensated current to achieve active power filtering. Thus, the APF functions can be verified without physical inductive, capacitive and resistive testing loads.
The major contributions of this research can be summarized as follows. First, the D-Σ digital control is applied to high power inverter and achieves APF functions. Secondly, the proposed single-phase circulation test can verify the functions of APF without physical loads.

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