電力網路常因大型負載用電,如鍊鋼廠電弧爐、大型切焊機具、固態變頻等設備之工作,造成同一線路其它用戶電源遭受污染,進而產生電壓斷續波動不穩定供電品質;致使許多設備故障或工作失效,其中以燈具照明光線閃爍最為嚴重,因為它直接影響人眼視覺不舒適。 為解決此問題必須發展一套儀錶做定點長期電力品質監測,找出電源諧波、暫態、閃爍等污染問題及發生裝備要求改善電力功因品質;有關電壓閃爍部份IEC868制定閃變儀量測功能方塊圖做為電源監測規範。 本文即對10Hz等效制定電壓閃爍標準及IEC868傳統類比閃變儀特性學習,再以數位訊號處理技術(DSP)加以模擬精進;在實驗中以TI公司的數位訊號處理發展套件(DSK6711)做模擬訊號檢測輸入之反干擾濾波、類比數位轉換、均方根值計算,快速傅立葉轉換,視覺感受加權濾波器、10Hz等效演算分析、資料存取與介面控制, Tektronix儀錶任意波形產生器做一數學函數模擬閃爍電源輸出。 以數位訊號處理技術(DSP)來發展測試電壓閃爍,其時效快、電路模組簡單、軟體工具支援廣泛、準確度提高、校正快速、學習容易,未來又可朝向多功能、手上型、網路通訊等設計,在此學習過程中四個模擬實驗即可證明,所用之硬體及軟體皆市場有產品支援,稍加學習即可達成所要結果。
A heavy load at the power network, like arc furnace, welding machine, and solid state converter, the voltage would change and influence the other equipments on the same transmission line. The phenomena of flicker affect lighting equipment and result in visual uncomfortable. Before solving the problem, monitoring the voltage variation to find out the harmonics, transient, flicker, and other’s power quality problem is needed, The IEC868 specific’s function blocks are usually suggested to measure the flicker events. The thesis begins with studying the 10Hz equivalent method and the flicker’s characteristics. Then TI company’s digital signal processor and 6711 DSK circuit board are surveyed. The second step is to apply these technologies, such as anti-alias filter, A/D converter, mean square root value, Fast Fourier Transform, the weight filter of the visual sense, 10Hz equivalent spectrum computation, data access, and interface control for simulate flicker. The final step is to use an arbitrary wave function by Tektronix instrument to generate the waveforms needed. DSP technologies for voltage flicker measurement equipment have been employed. The advantages are simple structure, many supporting software and tools, highly accurate, fast correction, and easy operation in the future. It also can be used in the forms of handheld set, network connecting, and multi-function configuration. The results are presented through experiments and numerical simulations.