本論文提出以高效能且具有浮點運算能力的數位信號處理器(DSP,
Digital Signal Processor)為基礎，實現一台單機型式的數位功率電錶，此數位功率電錶具有基本電力參數量測功能、總諧波失真因數量測功能、湧浪電流量測功能、平均模式量測功能、視窗模式量測功能及檔位自動切換功能。因數位信號處理器的高速運算能力，所有的量測功能皆可以做到即時性的量測。數位功率電錶的取樣頻率為同步倍頻取樣，是依據待測電壓信的頻率，利用直接數位合成(DDS, Direct Digital Synthesis)的原理，以FPGA 產生同步倍頻取樣的取樣信號，做為類比/數位轉換器的轉換信號。本數位功率電錶使用複數型快速傅立葉轉換演算法，做電壓及電流的諧波分析，計算電壓總諧波失真因數及電流總諧波失真因數，節省DSP 的運算時間。

This thesis proposes a DSP-Based stand-alone Digital Power Meter that
using high perofomance floating-point Digital Signal Processor. The Digital Power Meter has power parameters measurement function, total harmonic distortion factor measurement function, inrush current measurement function,average mode measurement function, window mode measurement function and auto range switching function. All measurement function of the Digital Power Meter can be done in real time because the DSP has high-speed calculation ability. The Digital Power Meter’s sampling signal is synchronized with the frequency of the voltage signal. The synchronized sampling is based on DDS(Direct Digital Synthesis) theorem and is implemented on FPGA, the synchronized sampling signal is used for A/D converter’s conversion signal. The Digital Power Meter uses CFFT(Complex-Valued FFT) algorithm for voltage and current’s total harmonic distortion factor analysis, it saves the DSP’s calculation time.

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