由於煉鋼廠內的電弧爐在運轉時，通常會造成電壓閃爍的問題。而如何準確計算出電壓閃爍量是電壓閃爍管制與改善的首要之務。由於FPGA具有體積小、性能好及低成本，所以本論文使用FPGA來計算電壓閃爍量。而文中並製作能產生電壓閃爍波形的電路，以及在FPGA端製作能將類比型式的電壓波形資料轉成數位信號，以供FPGA運算的電路。文中以間接解調法計算電壓閃爍量，並且改善在較高調變頻率上會計算不準確的問題。然後。使用硬體描述語言撰寫間接解調法的計算式。之後。使用自定的電壓閃爍波形供給FPGA計算，將計算結果和自給值做比較，其誤差率最大為2.6%。最後使用實際的電壓波形資料，分別使用FPGA和Matlab計算，而兩者之間的誤差率最大為3.39%。

Since the operation of the arc furnace in a steel factory usually results in voltage flicker problems, how to accurately calculate the voltage flicker severity is the first step in the voltage flicker limitation and improvement. The advantages of FPGA include small size, great performance, and low cost, so that this thesis chooses the FPGA module to calculate the amount of voltage flicker. It is also to design an electric circuit that can generate voltage flicker waveforms. The function of the FPGA module is designed to transfer the data of analog-type voltage waveform in the digital data for the voltage flicker calculation. In this thesis, the indirect demodulation method is used to calculate the amount of voltage flicker and to improve the inaccurate problem in higher modulating frequency components. Then, the Hard Description Language (HDL) is used to develop the computation by using the indirect demodulation method. Afterward, the voltage flicker components of the self-defined voltage waveform are calculated in FPGA, and the maximum error of components is 2.6%. Finally, the voltage flicker components of an actual voltage waveform are calculated in FPGA and MATLAB, separately, and the maximum calculation error between FPGA and MATLAB is 3.39%.

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