本論文針對電力變壓器無載試驗提出電流微分方法消除其所產生之電壓諧波，並以數位信號處理器為基礎改善其電力品質。本論文系統包含硬體實作及軟體規劃，在硬體實作方面包含反流器、感測器、濾波器及串聯變壓器。在軟體規劃方面包含d-q軸轉換、數位濾波器及控制演算法。
經實驗結果與模擬驗證，本文所建議電流微分方法能改善電力變壓器無載試驗電源品質。

This thesis proposes a current differential method to reduce the output voltage harmonics for a no load test of a transformer. In this thesis, a digital signal processor is used to control and improve the power quality when a no load transformer test is executed. The system includes both hardware and software. The hardware circuits consist of an inverter, some sensing circuits, a filter circuit, and an isolation transformer. The software includes the d-q axis transformations, a digital filter, and control algorithm.
　　The experimental results can validate the simulated waveforms. This thesis proposes a new method to improve the performance of no load test for a transformer.

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