以動態相量技術改善耦合電容比壓器之量測失真及其DSP之實作驗證

The Improvement of the Distortion of a Coupling Capacitor Voltage Transformer by Dynamic Phasor technique and its DSP Evaluations

施鈞坪(Chun-Ping Shih)

指導教授 ： 俞齊山 ； 曾國雄

國立臺北科技大學/電資學院/電機工程系所/碩士(2010年)

摘要

經由耦合電容比壓器量測的暫態電壓中所含的振盪成份會影響測距電驛所量測的阻抗值，並使其量測結果無法立刻收斂至正確值。針對以上問題，本論文使用動態相量技術以有效的表示並移除故障測量值中的暫態成份，使阻抗值不受暫態成份影響，立即收歛至正確值。
本論文之理論驗證分成軟體模擬及硬體實作兩大部分，軟體部份，使用SIMULINK模擬出故障時的電力訊號並作為演算法運算初步的資料來源。硬體部份，把SIMULINK模擬的資料匯入數位訊號處理器，搭配Code Composer 3.3之整合發展環境軟體，同樣也可正確的估算測距阻抗。由實驗結果顯示，MATLAB模擬和DSP實測結果相仿，表示以動態相量技術為基礎的演算法可應用於DSP實作中。

關鍵字

動態相量 ； 離散傅立葉轉換 ； 耦合電容比壓器

並列摘要

The fault voltage measured by CCVT may contain oscillation components and cause the impedances obtained by distance relays inaccurate. In considering the above problem, this thesis used the dynamic phasor technique to accurately present and completely remove the transient components in fault measurements. Thus the fault impedances value will be no longer affected by transient components, and cto the accurate fault impedance can be measured rapidly.
In this thesis, software and hardware environments were used for theoretical evaluations. In the software environment, some SIMULINK-based model were used to generate the fault signals for computations, In the hardware environment, the fault signals generated from SIMULINK were sent into a Digital Signal Processor cooperating with Code Composer 3.3 to obtain fault impedances. The results show that both the software and hardware environment are able to achieve accurate results. Therefore, the dynamic phasors technique algorithms have the potentials to be established on a practical environment.

並列關鍵字

Dynamic Phasor ； Coupling Capacitor Voltage Transformer ； Discrete Fourier Transform

參考文獻

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Distance Protection By Simultaneously Considering the