大型鋼鐵廠的電弧爐運轉時，會造成相當劇烈的無效功率變動與電壓閃爍，這是電力品質重要的議題之一。本文利用離散小波轉換來計算IEEE Standard 1459-2010定義下之各種電力量，分析10處電弧爐廠在點弧期、熔解期、精煉期之電力量，並針對電弧爐無效功率做一週期與半週期計算，探討各相無效功率與三相無效功率變動特性，作為日後設計無效功率改善設備之依據。並以每秒3840點取樣頻率量測之電弧爐廠資料，做無效功率補償量分析，評估無效功率改善設備對改善無效功率之效用，計算之結果期盼可達成所預期的電力品質管制及改善。

When an electric arc furnace in a large steel plant is used, it will cause quite drastic fluctuation of reactive power and voltage flicker, which is one of the important issues of power quality. In this thesis, discrete wavelet transform (DWT) is used to calculate various electric power quantities defined by IEEE Standard 1459-2010. It analyzes the electric power quantities during the arc-on period, melting period, and refining period in ten electric arc furnace plants. Furthermore, it performs one cycle and half cycle calculations of the reactive power of the electric arc furnaces, investigates the characteristics of per-phase and three-phase reactive power variations. These findings serve as a basis for designing reactive power improvement equipment in the future. The study also conducts analysis of reactive power compensation using data obtained from electric arc furnace plants with a sampling rate of 3840 points per second. It evaluates the effectiveness of the existing reactive power improvement equipment in improving reactive power. The calculated results aim to achieve the desired control and improvement of power quality.

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