使用可變字串基因演算法進行具模糊負載電力系統之低頻電驛參數設計

Parameter Design of Low-frequency Relay for Power System with Fuzzy Loads Using Variable-Strings-based Genetic Algorithms

陳柏亘(PO-HSUAN CHEN)

指導教授 ： 洪穎怡

中原大學/工學院/電機工程研究所/碩士(2010年)

https://doi.org/10.6840/cycu201000961

摘要

本文針對一小型獨立電力系統，規劃其低頻電驛設定參數，當電力系統遇到嚴重擾動，如發電機組跳機時，以避免配電饋線不必要的跳脫與停電。
本文使用NEPLAN V5.4.3模擬軟體建立小型獨立離島電力系統，探討其電力潮流分析，並模擬系統遇到最大發電機組跳機時之暫態穩定度分析，利用可變字串基因演算法及處罰函數之概念，找出最適合系統的低頻電驛之參數設定。
本文使用模糊理論中的α位階來模糊化小型獨立離島電力系統之總負載，並應用交談式多目標非線性規劃來設計傳統多段低頻電驛參數，求得獨立離島系統之卸載量最小值與初始搖擺頻率最大值，以達到降低用戶端損失。
由模擬結果觀察到可變式基因演算法中，以模糊多目標函數設計低頻電驛參數，電力系統頻率可趨於穩定，並使發生故障時之總卸載量及最低頻率越小，因此驗證本文所提出方法之可行性。

關鍵詞: 模糊理論、α位階、低頻卸載、基因演算法、處罰函數、交談式決策、多目標非線性規劃。

關鍵字

多目標非線性規劃 ； 交談式決策 ； 處罰函數 ； 基因演算法 ； 低頻卸載 ； 模糊理論 ； α位階

並列摘要

In this thesis, the parameters of the low-frequency relay are designed for a small independent power system. The unnecessary load shedding can be avoided once the power system is subject to severe disturbances, e.g., generator tripping.
The NEPLANE V5.4.3 software package was used to set up the small independent power system. The power flow and the transient stability analysis were conducted considering severe generator trippings. The optimal parameters of the low-frequency relay are obtained using variable string Genetic Algorithms and penalty function.
The total system load was modeled by the -cut in the fuzzy set theory for the small independent power system. The interactive multi-objective nonlinear programming was used to design the traditional multi-stage load shedding. The shed load is minimized and the initial swing frequency is maximized for mitigating the loss of costumer’s load.
It can be found from the simulation results that the power system can be stable using the proposed fuzzy multi-objective approach based on the variable-string Genetic Algorithms. This validates the applicability of the proposed method.
Key word: Fuzzy theory, α-cut, Under-frequency Load Shedding, Genetic Algorithm, Penalty Function, Interactive Decision Making, Multi-objective Nonlinear Programming.

並列關鍵字

under-frequency relay ； load shedding ； genetic algorithm ； fuzzy set

參考文獻

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[20] 謝宏明，「使用基因演算法進行配電系統靜態轉供開關安裝位置之決定」，碩士論文，中原大學，民國93年6月。

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