近年來電力業者逐漸重視電力品質的問題，包括電壓閃爍、電壓不平衡以及諧波等。電壓閃爍是由大型工廠的變動性負載所造成的，例如鋼鐵廠的電弧爐在運作時就可能會造成相當劇烈的電壓閃爍。若是能夠迅速地計算出電壓閃爍的量，就可用來輔助補償設備，告知要補償多少的量以達成最佳的補償。因此本文設計FPGA晶片的電路來計算電壓閃爍，首先分析電壓閃爍的計算方式，包括直接解調法與間接解調法。然後針對間接解調法的計算流程提出改善，說明計算電壓閃爍之FPGA晶片的設計流程。然後使用複合振幅調變方程式產生測試信號，分別使用ModelSim模擬FPGA晶片計算的結果與使用Matlab計算的結果做比較。經本文的模擬測試後證實，設計出來的電路確實能夠精準計算調變頻率的電壓變動量。

In recent years, electric utilities have paid attention to the issues of power quality on power systems. The issues include voltage flicker, voltage unbalance, and harmonics. The major sources of voltage flicker are produced from the varying load of large-scale industry customers, such as furnaces of steel factories. If there is a method to compute the quantity of voltage flicker quickly, then it can assist the compensator to modify the compensated quantity instantaneously. So in this study, it is to design the logic circuits of FPGA to calculate the voltage flicker level. Firstly, the computation approaches of voltage flicker, including the direct demodulate method (DDM) and the indirect demodulate method (IDM), are investigated. Then, a design using the FPGA chip is developed to compute the level of voltage flicker. Then the generated test signals of complex amplitude modulation functions are used to compare the computation results between using ModelSim to simulate FPGA and using Matlab. From the simulation results, the designed logic circuits really can calculate the values voltage fluctuation at the modulated frequency.

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