- 作者: 黃慶連; 凌拯民; 林清一
- 作者服務機構: 成功大學電機工程學系; 成功大學航太工程學系
- 中文摘要: 傳統上對於電力潮流分析時所遭遇之不確定資訊皆利用機率分析予以處理,然而並非所有的不確定類型皆適用此法。對於具有非統計特性之不確定資訊,應用模糊集合(Fuzzy Sets)分析之方式則正逐漸受到重視。本論文首先即針對模糊電力潮流之求解與機率法互相比較,分析過程中將使用適當之直流線性化技巧及模糊數代數運算,來簡化因牽涉到不確性資訊而增加之計算負擔,並同時檢驗主觀及客觀兩類四邊形模糊數設定法之執行效果。在應用了可能性-機率相依(Possibility-Probability Consistency)原理後,可直接由節點之機率密度函數導出其客觀模糊數。分析結果顯示,在犧牲了少數較不重要之機率資訊後,利用主觀乏晰數之運算流程能得到較為合理之電力潮流分佈範圍。為了能建立一個綜合考慮各種不確定類型測量數值之模式,本論文將提出一個新的概念性架構,經由混合數(Hybrid Number)之觀念,使得被歸類後的乏晰數及機率函數能夠協調地結合在一起。此種混合法最重要的貢獻在於能夠有效地降低電力潮流不合理之分佈範圍,並同時增進系統執行之效率。最後,我們將利用IEEE 25匯流排系統,對本計劃探討之各類方法進行測試及比較。
- 英文摘要: Conventional probability analysis is a popular method for managing the uncertainties encountered in powerflow analysis. It is now recognized that the probability approach can not model every kind of uncertainty. Forthis reason, the fuzzy set theory is increasingly used to represent vagueness with a non-statistical nature. In thisstudy, fuzzy load flow analysis is firstly evaluated and compared with the probability technique The DC lineanzingtechnique and fuzzy number algebraic operations are employed to simplify the computation efforts associated withuncertainties. For a complete investigation, the results of the objective and subjective assignment for the trapezoidalfuzzy number in the fuzzy algorithm will be examined. The possibility-probability consistency principle will beused to assign objective fuzzy nodal information from the known probability density function. At the cost of losingsome trivial probability information, more reasonable power flow margins can be achieved by using subjectivefuzzy assignment. To develop a more versatile system model for managing general uncertainties, another fuzzy-probability approach is proposed. Under the conceptual framework of a hybrid number, classified fuzzy andprobabilistic information is integrated consistently The promising contributions of the proposed hybrid approachare in reducing the unreasonable distribution margins and improving the performance of power flow analysis. Thesethree approaches are demonstrated by using the IEEE 25-bus system.
- 中文關鍵字: probabilistic load flow; fuzzy number; hybrid number
- 英文關鍵字: --